EP4601869A1 - Procédé de fabrication d'au moins une partie d'un article chaussant, par exemple une chaussure, une sandale, une botte, etc., et notamment un article chaussant pour la pratique d'un sport - Google Patents
Procédé de fabrication d'au moins une partie d'un article chaussant, par exemple une chaussure, une sandale, une botte, etc., et notamment un article chaussant pour la pratique d'un sportInfo
- Publication number
- EP4601869A1 EP4601869A1 EP23793433.6A EP23793433A EP4601869A1 EP 4601869 A1 EP4601869 A1 EP 4601869A1 EP 23793433 A EP23793433 A EP 23793433A EP 4601869 A1 EP4601869 A1 EP 4601869A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sole
- rod
- cavity
- main
- thermoplastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
- B29D35/061—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising by injection moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
- B29C44/332—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed parts being three-dimensional structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
- B29D35/061—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising by injection moulding
- B29D35/062—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising by injection moulding using means to bond the moulding material to the preformed uppers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
- B29D35/08—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts
- B29D35/081—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by injection moulding
Definitions
- TITLE Process for manufacturing at least part of an article of footwear, for example a shoe, a sandal, a boot, etc., and in particular an article of footwear for practicing a sport.
- the present invention relates to the field of manufacturing footwear, for example shoes, and in particular to the manufacturing of footwear comprising a light and cushioning sole, and in particular footwear for practicing a sport.
- thermoplastic, PVC or other elastomers With this process, the material can be foamed using a chemical or physical foaming agent; However, the disadvantage of this process is that the material of the sole of the shoe obtained does not have the expected properties of a light and cushioning sole. The lowest sole density that can be achieved with this process is greater than 0.5 g/cm3. In addition, the cushioning and comfort properties sought for the soles of running shoes, for example, are not achievable with this manufacturing process.
- the present invention relates to a method of manufacturing at least part of an article of footwear, for example a shoe, and in particular an article of footwear for practicing a sport, comprising the following steps:
- - provide a mold defining an open cavity, a shape of at least part of the cavity corresponding to a shape of a sole of the article of footwear, the cavity being configured to receive, via at least one channel of injection opening into the cavity, a mixture comprising a molten material and a supercritical fluid;
- the process makes it possible to obtain, in a single injection step, a light and cushioning sole of the footwear connected to a part of an upper of the footwear, with good resistance to detachment of the footwear. the sole and the upper.
- the dimensions of the shape of the at least part of the cavity are the dimensions on a scale between 1:0.98 and 1:1.02, advantageously 1:1, of the shape of the sole of the article of footwear.
- the pressurization of the cavity is accompanied by the simultaneous creation of a back pressure, advantageously of a substantially identical value, in a zone of the at least part of the rod of the other side of the closure in relation to the cavity.
- the back pressure advantageously of a substantially identical value, makes it possible to avoid leaks, at the level of the contact between the docking zone and the rim, of a pressurizing gas of the cavity.
- the area of at least part of the rod on the other side of the closure relative to the cavity can be depressurized simultaneously with the depressurization of the mold cavity to trigger an expansion of the mixture in the cavity and form the sole during the process according to the invention.
- a pressurization pressure in the cavity followed by a depressurization in the cavity allows an expansion of the mixture and the obtaining of the light and cushioning foamed material of the sole.
- the density of the sole is between 0.1 g/cm3 and 0.4 g/cm3, preferably between 0.15 g/cm3 and 0.25 g/cm3.
- the invention comprises one or more of the following characteristics, alone or in technically acceptable combination.
- a pressurization pressure of the cavity is between 3 bars and 50 bars, preferably between 10 bars and 30 bars, preferably equal to 15 bars.
- the method further comprises, prior to the step of pressurizing the cavity, the following step:
- a pressurization pressure in the complementary part of the closed volume advantageously identical to the pressurization pressure of the cavity, makes it possible to create the back pressure in order to avoid leaks, at the level of the contact between the docking zone and the rim , a gas for pressurizing the cavity.
- the cover is configured to form with the mold a closed volume, in particular gas-tight, around at least part of the rod, so as to allow the creation of said counter pressure at inside this sealed closed volume, in particular by receiving the pressurizing gas from the cavity in this sealed volume, in order to avoid leaks, at the level of the contact between the docking zone and the rim, of a gas of pressurization of the cavity.
- the method comprises a step of assembling the part of the upper connected to the sole, with another part of the upper, the assembly forming the article of footwear.
- the assembly step includes sewing the other part of the upper with the part of the upper connected to the sole.
- the method further comprises the following steps, implemented before the step of placing the edge of the opening of the open cavity in contact with the docking zone of a surface of the 'at least part of a stem:
- the closed volume further comprises the support with at least part of the rod.
- the at least part of the rod is a complete rod.
- the support is made of aluminum, steel, or plastic.
- the process makes it possible to obtain, in a single injection step and with a single mold, a complete article of footwear comprising the sole of the article of footwear connected to the complete upper of the shoe.
- the mold is in a single part.
- the mold comprises at least two parts and the provisioning step comprises a step of assembling the at least two parts to form the mold.
- the mold comprises a ring part comprising a first half of a ring and a second half of a ring, the first half being movable relative to the second half of a ring in a sliding direction, of so that a sliding movement of the first half towards the second half in the sliding direction closes the ring part of the mold, while a sliding movement of the first half and the second half in an opposite direction opens the ring part of the mold by separating the two halves of the ring part.
- the mold further comprises a mold base comprising a cover and a bell, said bell being configured to envelop the cover, and the first ring half and the second ring half of the mold when the ring part and the mold are closed.
- the mold base bell comprises a contact interface between the mold base bell and the ring part, said contact interface comprising a first inclined plane configured to slide on a first contact surface of a wall of the first half of the ring, said contact interface comprising a second inclined plane configured to slide on a second contact surface of a wall of the second half of the ring, the first angle of inclination of the first inclined plane and the second angle of inclination of the second inclined plane being configured so that the step of assembling and closing the mold comprises a movement of the bell from the bottom of the mold towards the two halves of the ring part which produces mechanically a sliding movement of the two halves in the direction of bringing the two halves of the ring part together, so as to close the ring part in contact with the mold base.
- the mold comprises an elastic device configured to separate the first half of the ring and the second half of the ring.
- contact interface between the bell of the mold base and the ring part comprises at least one guide configured to accompany the sliding movement of the two parts of the ring when the bell of the mold base moves in the direction transverse to the direction of sliding.
- the mold is actuated alternately in closing, respectively in opening, by moving the bottom of the mold towards the two halves of the ring part, respectively in the opposite direction.
- the cavity is configured to receive the mixture via at least two injection channels opening into the cavity. According to these arrangements, the process makes it possible to obtain even more quickly, and with a more homogeneous filling of the mold cavity, a sole of the article of footwear connected to a part of the upper of the article of footwear.
- the mold comprises at least one injection channel.
- the support comprises at least one injection channel.
- the method comprises a step of gluing the at least part of the surface of the at least part of the rod, the gluing step being carried out before the step d 'injection.
- the at least part of the surface of the at least part of the rod comprises heat-fusible wires configured to melt at an injection temperature of the mixture.
- the method further comprises the following steps:
- the inserts are positioned to be inserted at an external surface of the sole, or to be embedded inside the sole.
- the abrasion resistance of the sole is reinforced, or the dynamism of the sole is improved, depending on whether the inserts are respectively inserted towards an external portion of the sole, with for example one or more rubber inserts or made of thermoplastic material, or embedded inside the sole, for example with one or more inserts made of carbon plate or thermoplastic material.
- a contact surface between an insert and the sole comprises a texture
- the texture comprises a plurality of patterns distributed over a portion of the contact surface according to a density depending on a mechanical stress on the portion of the contact surface.
- the density is determined, so that on a portion of the contact surface the plurality of patterns occupies part of the portion of the contact surface, said part being between 1% and 15% , advantageously 6%, of the portion of the contact surface.
- the patterns are tubular and/or linear. According to one embodiment, a height of the patterns in a direction transverse to the contact surface is between 1mm and 10mm, preferably equal to 1.6mm.
- a thickness of the patterns, in a direction transverse to the direction of height is between 1mm and 2mm, preferably equal to 1.6mm.
- the adhesion between the insert and the sole is reinforced, by mechanical attachment, by eliminating the steps of gluing or surface preparation.
- an insert positioned to be inserted at an external surface of the sole comprises at least one through hole, the at least one through hole being matched with a pressurization channel, of so that a pressurizing gas can pass through the insert.
- the at least part of the surface of the at least part of the rod is at least partly perforated or open.
- the at least part of the surface of the at least part of the rod is textured or perforated in contact with the docking zone.
- the resistance to separation of the sole and the upper is further reinforced.
- the melted material is an elastomeric thermoplastic polymer.
- the thermoplastic polymer is a thermoplastic polyurethane (TPU), or an ether-amide block copolymer (PEBA), or an ethylene vinyl acetate (EVA), or a polyolef, or an ether-amide block copolymer. ester, or a styrene-based elastomer, or a mixture of these different components.
- TPU thermoplastic polyurethane
- PEBA ether-amide block copolymer
- EVA ethylene vinyl acetate
- ester or a styrene-based elastomer, or a mixture of these different components.
- the supercritical fluid is nitrogen in a supercritical state or carbon dioxide in a supercritical state or a mixture of nitrogen and carbon dioxide in a supercritical state.
- a majority by mass of the rod being made of a main rod material, and possibly one or more auxiliary rod material(s); a majority by mass of the sole being made of a main sole material, and possibly one or more auxiliary sole material(s), the foamed material, resulting from the expansion of the mixture, comprising said material main sole material and said auxiliary sole material(s); the main rod material, and optionally the auxiliary rod material(s), is/are selected from the following materials: polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, a thermoplastic polyurethane (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester, and in that the main material sole, and possibly the auxiliary sole
- the main sole material can thus be from the same chemical family as the main upper material. So for example, if the main upper material is a polyolefin, the main sole material is also a polyolefin. If the main upper material is a polyamide, the main sole material is also a polyamide.
- the main sole material, and possibly the auxiliary sole material(s) is/are identical to the main upper material, and optionally is/are identical to the (x) auxiliary rod material(s).
- main upper material, and optionally the auxiliary upper material(s), and the main sole material, and optionally the auxiliary sole material(s), is/are selected (s) among the same materials, or are chemically compatible with each other, their adhesion is facilitated, as well as the manufacture of the article of footwear and also its recycling. In fact, it is not necessary to separate all the components of the footwear item to recycle it. Recycling can be carried out in a single step by grinding the article of footwear then forming granules from said ground material.
- the applicant has surprisingly found that the main sole and upper materials listed above have the advantage that they can come in very different forms for shoe use and can be recycled several times.
- the main, and possibly auxiliary, upper and sole materials are selected so that the granules, at least partly recycled, are capable of being transformed by any plastic shaping technique (in particular by hot), for example by injection molding, by injection foaming, by extrusion molding, by extrusion blow molding, by thermoforming or even by thermomolding.
- the granules from the recycled footwear article according to the invention can be used in the manufacture of a sole or even a shoe component (such as a rear counter, a front hard toe, or even a lateral reinforcement) or in the manufacture of a yarn (for example by extrusion spinning) for the manufacture of a textile component (for example the manufacture of an upper component or an entire upper by knitting or weaving) or 'a foam component.
- the granules from the footwear item can also be used in the manufacture of a boot.
- Said granules can also be transformed into a nonwoven, for example by a technique called Meltblown or Spunbond or by their combination, such as a nonwoven called SMS (Spunbond/Meltblown/Spunbond) for example.
- a technique called Meltblown or Spunbond or by their combination, such as a nonwoven called SMS (Spunbond/Meltblown/Spunbond) for example.
- the main upper material can be chosen from polyesters, thermoplastic polyurethanes (TPU), polyolefins, and block copolymers composed of rigid polyamide blocks and soft polyether blocks.
- TPU thermoplastic polyurethanes
- polyolefins polyolefins
- block copolymers composed of rigid polyamide blocks and soft polyether blocks.
- the main sole material can be chosen from polyesters, thermoplastic polyurethanes (TPU), polyolefins, and block copolymers composed of rigid polyamide blocks and flexible polyether blocks.
- TPU thermoplastic polyurethanes
- polyolefins polyolefins
- block copolymers composed of rigid polyamide blocks and flexible polyether blocks.
- the rod may comprise a wire comprising a material chosen from: polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethane (TPU), an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- a material chosen from: polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethane (TPU), an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the upper may include a textile component, and in that the textile component comprises a yarn comprising the main upper material.
- the upper may comprise a textile part forming a foot receiving zone having an external face, and at least one part, in particular a band, comprising an olefinic thermoplastic elastomer, said band being secured to said external face of the textile part, and to said sole.
- the sole may comprise a cellular component, and/or foam beads, comprising a material selected from: polyolefins, styrenic thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethane (TPU), an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- a material selected from: polyolefins, styrenic thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethane (TPU), an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the upper may include a front hard toe including the main upper material or an auxiliary upper material, and/or a rear buttress including the main upper material or an auxiliary upper material.
- the upper may comprise at least one eyelet for passing through at least one lacing element, said at least one eyelet for passing through comprises a textile strip comprising at least one thread comprising the main upper material, in particular the main upper material is a polyolefin.
- the upper may include a foam component comprising the main upper material, in particular the main upper material is a polyolefin.
- the upper and/or the sole each comprises a recycled material from a sole and/or the upper of another shoe, and/or a recycled material from a sole and/or of the upper of a boot.
- the ratio of the mass of the main rod material, and possibly of the mass of the auxiliary rod material(s), to the total mass of the rod is greater than or equal to 40%.
- the ratio of the mass of said main rod material and the mass of the auxiliary rod material(s), to the total mass of the rod is greater than or equal to 50%.
- the ratio of the mass of the main sole material, and possibly of the mass of the auxiliary sole material(s), to the total mass of the sole is greater than or equal to 40%.
- the ratio of the mass of said main sole material and the mass of the auxiliary sole material(s), to the total mass of the sole is greater than or equal to 50%.
- the footwear article may comprise at most 10% by mass of one or more contaminating material(s) not chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethane (TPU), an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester, in particular not more than 10% by mass of one or more thermoplastic contaminant material(s) and/or at most 5% by mass of one or more thermosetting contaminant material(s).
- the main sole material, and possibly the auxiliary sole material(s) is/are derived at least in part from the recycling of at least one other article of footwear.
- the method may further include collecting the article of footwear, and it may include transforming the article of footwear into thermoplastic granules.
- the transformation step includes:
- the method may include a step of hot transformation of at least part of said thermoplastic granules for the manufacture of a plastic part, in particular forming at least in part an article for practicing a sport.
- the invention also relates to a plastic part, in particular forming at least in part an article for practicing a sport, capable of being obtained by this process, in particular said part is a palm sail.
- the invention also relates to an article of footwear, for example a shoe, and in particular an article of footwear for practicing a sport, obtained by the process according to one of the modes of implementation described above.
- the main upper and sole materials, and possibly the auxiliary upper and/or sole material(s), selected in the present invention may be thermoplastic materials which have the advantage of being derived from olef es. These materials can thus advantageously be transformed several times hot without their properties deteriorating significantly, in particular because of oxidation caused by air and/or humidity. This ability allows them to improve the longevity of their recyclability cycle unlike certain polymer materials, such as polyurethanes in particular, which oxidize over time.
- the article of footwear can thus be recycled several times.
- the auxiliary upper material(s) may be different from the main upper material and/or the main sole material.
- the auxiliary sole material(s) may be different from the main sole material and/or the main upper material.
- the auxiliary sole material(s) may be different from each other.
- the main or auxiliary upper material is identical to the main or auxiliary sole material” that the main/auxiliary upper material is in the same basic polymer material as that of the main/auxiliary sole material.
- the main or auxiliary upper material is different from the main or auxiliary sole material” that the main/auxiliary upper material is not in the same basic polymer material as that of the main/auxiliary sole material.
- the main upper material and/or the main sole material is/are chosen from polyolefins, and/or olefinic thermoplastic elastomers, and/or styrenic thermoplastic elastomers, and/or vulcanized thermoplastic elastomers. .
- the main upper material is a thermoplastic polyurethane (TPU), or an ether-amide block copolymer (PEBA), or an ethylene vinyl acetate (EVA), or a polyolefin, or an ether-ester block copolymer , or styrenic thermoplastic elastomer, or an olefmic thermoplastic elastomer, or a vulcanized thermoplastic elastomer, or a styrene-based elastomer, or a polyester, or a mixture of these different components.
- TPU thermoplastic polyurethane
- PEBA ether-amide block copolymer
- EVA ethylene vinyl acetate
- styrenic thermoplastic elastomer or an olefmic thermoplastic elastomer, or a vulcanized thermoplastic elastomer, or a styrene-based elastomer, or a polyester, or a mixture of these different components.
- the main sole material is a thermoplastic polyurethane (TPU), or an ether-amide block copolymer (PEBA), or an ethylene vinyl acetate (EVA), or a polyolefin, or an ether-ester block copolymer , or styrenic thermoplastic elastomer, or an olefmic thermoplastic elastomer, or a vulcanized thermoplastic elastomer, or a styrene-based elastomer, or a polyester, or a mixture of these different components.
- TPU thermoplastic polyurethane
- PEBA ether-amide block copolymer
- EVA ethylene vinyl acetate
- styrenic thermoplastic elastomer or an olefmic thermoplastic elastomer, or a vulcanized thermoplastic elastomer, or a styrene-based elastomer, or a polyester, or a mixture of these different components.
- a vulcanized thermoplastic elastomer is only used in an outsole and not in a midsole.
- only the outsole is the only part of the sole that can comprise a thermoplastic vulcanizate (TPV).
- TPV thermoplastic vulcanizate
- the rod auxiliary material(s) is/are selected from polyolefins and/or styrenic thermoplastic elastomers and/or olefinic thermoplastic elastomers and/or vulcanized thermoplastic elastomers.
- the auxiliary sole material(s) is/are selected from polyolefins and/or styrenic thermoplastic elastomers and/or olefinic thermoplastic elastomers and/or vulcanized thermoplastic elastomers.
- the upper comprises a forefoot region configured to cover the front of the foot in whole or in part, and/or a rearfoot region configured to cover the rearfoot in whole or in part, and/or a medial region configured to cover a medial side of the foot in whole or in part, and/or a lateral region configured to cover a lateral side of the foot in whole or in part, and/or an instep region configured to cover all or part of the instep, and/or a leg region configured to cover all or part of the leg.
- a forefoot region configured to cover the front of the foot in whole or in part
- a rearfoot region configured to cover the rearfoot in whole or in part
- a medial region configured to cover a medial side of the foot in whole or in part
- a lateral region configured to cover a lateral side of the foot in whole or in part
- an instep region configured to cover all or part of the instep
- a leg region configured to cover all or part of the leg.
- the rod comprises (optionally consists of) the main rod material, and optionally one or more auxiliary rod material(s), in particular said auxiliary rod material(s) is/are different from the main rod material and possibly different from each other.
- the main upper material may be a thermoplastic polyurethane (TPU), or an ether-amide block copolymer (PEBA), or an ethylene vinyl acetate (EVA), or a polyolefin, or an ether-ester block copolymer, or styrenic thermoplastic elastomer, or an olefinic thermoplastic elastomer, or a vulcanized thermoplastic elastomer, or a styrene-based elastomer, or a polyester, or a mixture of these different components, and a first auxiliary rod material may be an olefinic thermoplastic elastomer or an elastomer vulcanized thermoplastic.
- TPU thermoplastic polyurethane
- PEBA ether-amide block copolymer
- EVA ethylene vinyl acetate
- a first auxiliary rod material may be an olefinic thermoplastic elastomer or an elastomer vulcanized thermoplastic.
- the main rod material may be polypropylene or polyethylene
- the rod includes a first auxiliary rod material, different from the main rod material, selected from polypropylene and polyethylene.
- the main rod material can thus be polypropylene and the first auxiliary rod material can be polyethylene.
- the article of footwear is a shoe
- the main upper material is a thermoplastic polyurethane (TPU), or an ether-amide block copolymer (PEBA), or an ethylene vinyl acetate (EVA), or a polyolefin, or an ether-ester block copolymer, or styrenic thermoplastic elastomer, or an olefinic thermoplastic elastomer, or a vulcanized thermoplastic elastomer, or a styrene-based elastomer, or a polyester, or a mixture of these different components, and preferably a polyolefin , preferably polypropylene or polyethylene.
- the main upper material is different from the main sole material, and the sole also comprises a first auxiliary sole material identical to the main upper material (in particular said first auxiliary sole material is not in the majority in mass in the sole).
- the main upper material is a polyolefin
- the main sole material is a styrenic thermoplastic elastomer
- the first auxiliary sole material is a polyolefin.
- the main upper material and/or the main sole material and/or the auxiliary upper material(s) and/or the auxiliary sole material(s) may be a or recycled material(s) from a sole and/or upper from another shoe or boot and/or plastic(s) and/or be derived from biomass.
- the rod may comprise (in particular may consist of) one or more rod component(s) comprising (in particular consisting of) said main rod material and/or one or more auxiliary material(s) of stem.
- An upper component may be a textile component, or a reinforcing component, or a lacing component, or a cushioning component, or a cellular component such as a foam, or a lace, or an eyelet, or a hard toe front, or a rear or side buttress, or a combination of these.
- the textile component may be a fabric, a knit, a non-woven, a braid, a cable, a fiber spun yarn, a multi-filament yarn, a mono-filament yarn, a set of fibers, or a combination of these. last.
- the textile component may be a textile (a knitted fabric or a fabric for example) in three dimensions, that is to say comprising upper and lower textile panels connected by intermediate threads extending between said textile panels.
- the textile component may be a knitted component, for example knitted on a straight knitting machine, or on a warp knitting machine, or on a circular warp or weft knitting machine, in particular of small diameter.
- the textile component may be a knitted tube, in particular a knitted sock comprising a knitted heel portion.
- the rod comprises one or more rod component(s) assembled by gluing, sewing, or even welding (for example by ultrasound or by high frequency).
- the upper comprises a textile component of unitary textile construction, in particular of unitary knitted or woven construction, said component comprising a forefoot region and/or a rearfoot region and/or a lateral region and /or a medial region and/or an instep region.
- the textile component does not include any seam(s) or weld(s) other than those possibly necessary for its shaping, for example for join edges.
- the rod comprises a cellular component, in particular a foam, and/or foam balls, comprising a material selected from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester, preferably a thermoplastic elastomer olefin or a polyolefin, more preferably a polyolefin.
- Said material may be the main rod material or an auxiliary rod material.
- the upper comprises a cellular component, in particular a foam, and/or foam beads, comprising the main upper material.
- the mass fraction of said main rod material in the rod is greater than or equal to 20%, preferably greater than or equal to 30%, more preferably greater than or equal to 40%.
- the mass fraction of said main rod material in the rod is less than or equal to 90%, in particular less than or equal to 80%, more particularly less than or equal to 70%, in particular less than or equal to 60%.
- the mass fraction of said main rod material in the rod may be greater than or equal to 60%, preferably greater than or equal to 70%, more preferably greater than or equal to 80%, preferably greater than or equal to 90%.
- the fraction of surface occupied by the main rod material in the rod is greater than or equal to 30%, preferably greater than or equal to 40%, more preferably greater than or equal to 50%.
- the fraction of surface area occupied by the main rod material in the rod is less than or equal to 90%, in particular less than or equal to 80%, more particularly less than or equal to 70%.
- the fraction of surface area occupied by the main rod material in the rod may be greater than or equal to 60%, preferably greater than or equal to 80%, more preferably greater than or equal to 90%.
- the fraction of surface occupied by the main rod material and by one or more auxiliary rod material(s) in the rod is greater than or equal to 60%, more preferably greater than or equal to 70%, preferably greater than or equal to 80%.
- the rod comprises the main rod material and a first auxiliary rod material, the mass fraction of the first auxiliary rod material in the rod is greater than or equal to 5%, preferably greater than or equal to 20% .
- the mass fraction of the first auxiliary rod material in the rod is preferably less than or equal to 60%, preferably less than or equal to 50%, more preferably less than or equal to 40%.
- the rod comprises the main rod material and one or more auxiliary rod material(s), in particular a first and/or a second auxiliary rod material(s); the ratio of the mass of said main rod material, and of the mass of the auxiliary rod material(s), to the total mass of the rod is greater than or equal to 50%, preferably greater than or equal to 60%, again preferably greater than or equal to 70%, preferably greater than or equal to 80%, in particular greater than or equal to 90%.
- the ratio of the mass of said main rod material, and of the mass of the auxiliary rod material(s), to the total mass of the rod is less than or equal to 90% or 80%.
- the rod comprises a first auxiliary rod material which is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer ( PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; preferably a polyolefin or an olefinic thermoplastic elastomer or a vulcanized thermoplastic elastomer; still preferably a polyolefin.
- a first auxiliary rod material which is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamide
- the rod comprises a first auxiliary rod material and a second auxiliary rod material which is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; preferably a polyolefin or an olefinic thermoplastic elastomer or a vulcanized thermoplastic elastomer; still preferably a polyolefin.
- polyolefins styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an
- the first auxiliary rod material is different from the second auxiliary rod material.
- the article of footwear is a shoe
- the main upper material is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides , an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the mass fraction of the main rod material in the rod is greater than or equal to 40% and less than or equal to 80%, more preferably less than or equal to 60%.
- the mass fraction of the first auxiliary rod material in the rod is greater than or equal to 5%, more preferably less than or equal to 40%, more preferably less than or equal to 30%; for example between 25% and 40%.
- the surface fraction of the main rod material which is a polyolefin, in particular polypropylene, in the rod is greater than or equal to 45%.
- the surface fraction of the main rod material and a first auxiliary rod material which is a polyolefin, in particular polyethylene, in the rod is greater than or equal to 70%.
- the surface fraction of a second auxiliary rod material, which is an olefinic thermoplastic elastomer or a styrenic thermoplastic elastomer or a vulcanized thermoplastic element, in the rod is greater than or equal to 15%, in particular less than or equal to 30%.
- the footwear is a shoe
- the main upper material is an olefin thermoplastic elastomer or a vulcanized thermoplastic elastomer
- the upper further comprises a first auxiliary upper material, in particular which is a polyolefin , for example polypropylene or polyethylene.
- the mass fraction of the main rod material in the rod is greater than or equal to 40% and less than or equal to 80%, more preferably less than or equal to 60%.
- the mass fraction of the first auxiliary rod material in the rod is greater than or equal to 5%, more preferably greater than or equal to 20%, in particular greater than or equal to 30% and less than or equal to 50%, more particularly greater than or equal to 35% and less than or equal to 45%.
- the sole comprises (in particular is made up of) the main sole material and possibly one or more auxiliary sole material(s), in particular different from the main sole material.
- Said auxiliary sole material(s) is/are preferably chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides , an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the main sole material may be a styrenic thermoplastic elastomer and the sole comprises a first auxiliary sole material, which is a polyolefin, for example polypropylene or polyethylene.
- the sole comprises a first auxiliary sole material which is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer ( PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; preferably a polyolefin or a styrenic thermoplastic elastomer or a vulcanized thermoplastic elastomer.
- a first auxiliary sole material which is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block cop
- the mass fraction of the main sole material in the sole is greater than or equal to 25%, more preferably greater than or equal to 40%, preferably greater than or equal to 50%, more preferably greater than or equal to 60%.
- the mass fraction of the main sole material in the sole is less than or equal to 80%.
- the mass fraction of the first auxiliary sole material, in the sole is greater than or equal to 10%, more preferably less than or equal to 40%, preferably less than or equal to 30%, for example between 15% and 25% (upper and lower limits included).
- the sole comprises the main sole material, and possibly one or more auxiliary sole material(s), in particular a first and/or a second auxiliary sole material(s), the ratio of the mass of the main sole material, and possibly the mass of the auxiliary sole material(s), to the total mass of the sole is greater than or equal to 30%, preferably greater than or equal at 40%, more preferably greater than or equal to 50%, preferably greater than or equal to 60%, more preferably greater than or equal to 70%, preferably greater than or equal to 80%, in particular greater than or equal to 90%.
- the ratio of the mass of the main sole material, and possibly of the mass of the auxiliary sole material(s), to the total mass of the sole is less than or equal to 90%, in particular less or equal to 80%, more particularly less than or equal to 70%.
- the footwear is a shoe
- the main sole material is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides , an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the mass fraction of the main sole material is greater than or equal to 55% and less than or equal to 70%.
- the mass fraction of the first auxiliary sole material is greater than or equal to 5% and less than or equal to 35%, in particular greater than or equal to 10% and less than or equal to 30%.
- the main sole material is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA).
- the sole may comprise a second auxiliary sole material which is
- the main sole material is a vulcanized thermoplastic elastomer
- the sole further comprises a first auxiliary sole material, in particular a styrenic thermoplastic elastomer, for example SEBS or SBS, optionally grafted.
- a first auxiliary sole material in particular a styrenic thermoplastic elastomer, for example SEBS or SBS, optionally grafted.
- the mass fraction of the main sole material in the sole is greater than or equal to 40% and less than or equal to 85%, more preferably greater than or equal to 30%, preferably greater than or equal to 40%, in particular greater than or equal to equal to 55%.
- the mass fraction of the first auxiliary sole material in the sole is greater than or equal to 8%, more preferably less than or equal to 30%, for example between 15% and 25%.
- the main sole material is polypropylene.
- the mass fraction of the main sole material in the sole is greater than or equal to 50%, more preferably greater than or equal to 80%, in particular greater than or equal to 90%, for example of the order of 100%.
- the sole comprises one or more auxiliary sole material(s)
- the latter(s) is/are preferably embedded, such as load(s) , in a polymer matrix formed by the main sole material.
- the sole according to the invention may be/may comprise an outsole or a midsole or a combination thereof.
- the footwear item comprises an outsole and a midsole, in particular the midsole is a removable insole.
- the midsole can be arranged removably in a space for receiving the foot of the article of footwear so as to come under the foot of the user.
- the midsole can also act as an insole.
- the sole according to the invention may comprise (be made up of) one or more sole component(s) comprising (in particular consisting of) said main sole material and/or one or more auxiliary material(s). ) of sole.
- a sole component may be an outsole, a midsole, a sockliner, a cushioning heel component (for example a donut), a textile component (as defined above with reference to the upper), a functional device providing stability, or a reinforcing or cushioning insert, or a cellular component, in particular a foam or a set of foamed and possibly agglomerated and/or glued balls.
- the sole comprises/is a midsole comprising an outer face coming into direct contact with the ground.
- the midsole is configured to perform the function of outsole.
- the footwear therefore does not include an outsole.
- the midsole is preferably a one-piece component.
- the sole comprises an outsole component, preferably comprises (or is) an outsole, having a density (g/cm3) greater than or equal to 0.85; preferably less than or equal to 1.30.
- the sole comprises a midsole component, preferably comprises (or is) a midsole, having a density (g/cm3) greater than or equal to 0.10; preferably less than or equal to 0.90; more preferably having a density less than or equal to 0.50; notably less than or equal to 0.40.
- a midsole component preferably comprises (or is) a midsole, having a density (g/cm3) greater than or equal to 0.10; preferably less than or equal to 0.90; more preferably having a density less than or equal to 0.50; notably less than or equal to 0.40.
- the sole comprises a midsole component, preferably comprises (or is) a midsole, having a density (g/cm3) greater than 0.50 and less than or equal to 0.85; in particular less than or equal to 0.75.
- a midsole component preferably comprises (or is) a midsole, having a density (g/cm3) greater than 0.50 and less than or equal to 0.85; in particular less than or equal to 0.75.
- the footwear item comprises an injected outsole, in particular comprising the main sole material (for example SEBS optionally grafted) and optionally a first auxiliary sole material (for example PP or PE), and an injected midsole, in particular directly on the outsole still in a softened state.
- the main sole material for example SEBS optionally grafted
- a first auxiliary sole material for example PP or PE
- the midsole comprises the main sole material (for example SEBS optionally grafted) and optionally the first auxiliary sole material (for example PP or PE), mixed with at least one foaming agent.
- the outsole and midsole are manufactured by bi-injection.
- the shoe comprises an insole, in particular arranged in the space receiving the foot of the shoe so as to come under the foot when the shoe is worn.
- the insole is preferably removable.
- the insole can advantageously comprise agglomerated foam balls, more preferably said foam balls comprise (in particular are) a material chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester, or a combination thereof.
- the insole may in particular comprise a foam comprising a polyolefin, in particular a polyethylene.
- Said foam can be laminated with a textile, possibly between two textiles.
- Said textile(s) comprising polyolefin yarns and/or fibers.
- polyolefin(s) cited in this text is/are chosen from homopolymers of polyolefins, optionally grafted, copolymers or terpolymers of polyolefins, optionally grafted.
- the polyolefin copolymers comprise two olefinic repeating units, optionally grafted.
- Polyolefin terpolymers comprise three or more olefinic repeating units, optionally grafted.
- Olefinic repeating units preferably include units derived from alkenes, particularly ethylene or propylene.
- the polyolefin(s) used in the present invention is/are by definition thermoplastic(s).
- R is an alkyl group comprising from 1 to 10 carbon atoms.
- polyolefin(s) cited in this text is/are preferably chosen from a list I comprising (in particular consisting of) polypropylene; polyethylene, in particular high density polyethylene, very high density polyethylene, low density polyethylene, and very low density polyethylene (LLDPE); polymethylpentene (PMP), polybutene-1 (PB-1), polyisobutene; preferably from polypropylenes and polyethylenes, in particular the polyethylene is chosen from high density polyethylene, very high density polyethylene, low density polyethylene, and very low density polyethylene (LLDPE).
- polypropylene polyethylene, in particular high density polyethylene, very high density polyethylene, low density polyethylene, and very low density polyethylene (LLDPE); polymethylpentene (PMP), polybutene-1 (PB-1), polyisobutene; preferably from polypropylenes and polyethylenes, in particular the polyethylene is chosen from high density polyethylene, very high density polyethylene, low density polyethylene, and very low density polyethylene (LLDPE).
- polyolefin(s) cited in this text may also be chosen from a list II comprising (in particular consisting of) poly(ethylene-vinyl acetate) (EVA) (in particular resulting from the copolymerization of ethylene and vinyl acetate, this is a copolymer of olefins), in particular non-crosslinked; ethylene polyvinyl alcohol.
- EVA poly(ethylene-vinyl acetate)
- the polylefin(s) cited in this text for the main sole material and/or the auxiliary sole material(s) may be chosen from mineral oils at olefin base(s), such as poly-alpha-olefins, in particular which are plasticizers of styrenic thermoplastic elastomers.
- the polyolefin may be a biosourced or petrosourced polyolefin, in particular biosourced, that is to say derived from renewable material(s), for example it may be a biosourced polyethylene derived from sugar cane. .
- biosourced material we understand any material made from renewable material(s), as opposed to petrosourced material.
- the biosourced polyolefin can have a so-called direct origin, that is to say that it comes directly from renewable material(s), or an indirect origin, that is to say that it comes from a mixture of renewable material(s) and petrosourced material(s) and/or recycled material(s).
- the polyolefin is defined by obtaining a certificate established according to the “mass balance approach” principle defining the proportion of recycled and/or biosourced material(s) used for obtaining it.
- thermoplastic olefin elastomer(s) cited in this text in particular for the main upper material and/or the main sole material and/or the auxiliary upper and/or sole material(s) is/are chosen from:
- EPDM ethylene, propylene and diene
- copolymers of ethylene and propylene copolymers of ethylene and propylene
- copolymers of ethylene and alpha-olefin(s) for example copolymers of ethylene and butene or copolymers of ethylene and octene, and a mixture of the latter
- EPDM and copolymers of ethylene and propylene and or
- thermoplastic elastomer(s) may be copolymers of ethylene and propylene, terpolymers of ethylene, propylene and diene, copolymers of ethylene and alpha-olefin(s) (for example copolymers of ethylene and butene or copolymers of ethylene and octene).
- thermoplastic elastomer(s) TPE-V
- main upper material and/or the main sole material and/or the or the auxiliary upper and/or sole material(s) is/are preferably:
- Vulcanization generally takes place during the extrusion-granulation stage.
- the highly vulcanized rubber phase is dispersed in the thermoplastic phase.
- This elastomer has the advantage of having good adhesion to olefinic polymers, such as polypropylene and polyethylene.
- This vulcanization is known in the state of the art as dynamic vulcanization during which the elastomer is vulcanized during its molten mixing with an appropriate thermoplastic polyolefin.
- Said vulcanized olefinic elastomer is preferably chosen from terpolymers of ethylene, propylene, and diene (EPDM); copolymers of ethylene and propylene; copolymers of ethylene and alpha-olefin(s), for example copolymers of ethylene and butene or copolymers of ethylene and octene, and a mixture of the latter; preferably EPDM and copolymers of ethylene and propylene. It is considered in this text that polyurethanes are not vulcanized thermoplastic elastomers.
- thermoplastic styrenic elastomer(s) cited in this text is/are preferably chosen from thermoplastic elastomers comprising styrenic repeating units (TPE-S) (in particular a styrene group: -CH(C6H5)-CH2 ), still preferably among thermoplastic elastomers comprising one or more styrenic block(s) and optionally one or more olefin block(s) (possibly grafted), preferably among poly(styrene -ethylene-butylene-styrene) (SEBS); poly(styrene-butadiene-styrene) (SBS); poly(styrene-butadiene) (SBC); poly(styrene-isoprene-styrene) (SIS
- a styrenic thermoplastic elastomer according to the invention can be grafted, for example the SEBS can be grafted, for example with one or more acid anhydride(s), such as maleic anhydride, and/or one or more acids ( s) carboxylic(s) and/or one or more vinyl function(s).
- acid anhydride(s) such as maleic anhydride
- the grafting of the styrenic thermoplastic elastomer has the function of improving the adhesion of the sole, for example the outsole, to another sole, for example an intermediate sole, and/or to the upper when the sole is injected directly onto the stem.
- thermoplastic elastomers selected in the context of the present invention have better processability and a lower associated energy cost than thermosetting elastomers by conventional thermoplastic processes such as injection molding, extrusion, thermoforming, blowing, etc.
- thermoplastic polyurethanes TPU
- polyamides polyamides
- PEBA ether-amide block copolymer
- EVA ethylene vinyl acetate
- ether-ester block copolymer a styrene-based elastomer
- polyester a polyester
- the main upper material and/or the main sole material, and optionally one or more auxiliary upper material(s) and/or one or more auxiliary sole material(s) has or have (in particular each) a melting temperature (Tf) and/or a glass transition temperature (Tg), in particular said or said melting temperature(s) is/are higher than said glass transition temperature(s).
- Tf melting temperature
- Tg glass transition temperature
- shoe means any article of footwear not including boots.
- boot means a rain or snow boot or a clog, in particular an article of footwear comprising an upper and a sole part comprising a polymer material in common forming a majority by mass of the upper and the sole. sole, said upper and the sole being molded together.
- thermoplastic material means any material capable of being softened or melted by heating, sufficiently, without degradation of the latter, so that it can be used in a plastic transformation process, such as those mentioned above, and this several times.
- the fraction of surface occupied by the main rod material added to the respective surface fraction(s) of the auxiliary rod material(s), measured in relation to the total surface area of the rod is greater than the fraction of surface occupied by any other material comprising the rod and not chosen from the main list defined in this text.
- the main rod material, and possibly the auxiliary rod material(s) may thus represent for example 30%, 40% or even 50% or 60% by mass of the rod or the exterior surface of the stem.
- main rod material we understand that the mass or surface fraction of the main rod material is greater than the mass or surface fraction of any auxiliary rod material, and possibly greater than the mass or surface fraction of any what other material does the rod include not chosen from the main list defined in this text.
- the auxiliary material(s) represent(s) (each) less than 30% by mass of the rod.
- the outer surface of the rod is preferably calculated from a rod projected flat. It may for example be the surface of the upper pattern before its three-dimensional shaping by sewing, but comprising all of the upper components arranged along its exterior surface.
- the mass fraction of said main sole material added to the respective mass fraction(s) of the auxiliary sole material(s), measured in relation to the total mass of the sole is greater than the mass fraction of any other material included in the sole not chosen from the main list defined above in this text.
- the main sole material, and possibly the auxiliary sole material(s) may thus represent 40% or even 50% or 60% by mass of the sole.
- main sole material we understand that the mass fraction of the main sole material is greater than the mass fraction of any auxiliary sole material, and possibly greater than the mass fraction of any other non-chosen sole material. in the main list defined in this text.
- the auxiliary material(s) represent (each) less than 30% by mass of the sole.
- the mass fraction of a main or auxiliary rod material in the rod is the ratio of the mass (g) of said main or auxiliary rod material to the total mass (g) of the rod.
- the fraction of surface area occupied by the main or auxiliary rod material in the rod is the ratio of the area occupied (cm 2 ) by said material visible on the total exterior surface (cm 2 ) of the upper projected flat, the exterior surface of the upper being that oriented outside the shoe.
- the mass fraction of a main or auxiliary sole material in the sole is the ratio of the mass of said main or auxiliary material to the total mass of the sole.
- first upper component comprises the main upper material
- second upper component comprises said main upper material
- the first component and the second component each comprise a main upper material in the same base polymer, which can be chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), a copolymer ether-ester block, a styrene-based elastomer, and a polyester; and in particular a polyolefin, for example PP or PE.
- polyolefins for example PP or PE.
- the basic polymer material of the first component may, however, be different from the basic polymer material of the second component due to hardness or its intrinsic properties (molar mass, degree of polymerization, quantity of monomer(s)) or its presentation (foam, textile). , foamed balls, etc.).
- the article of footwear in particular the upper and/or the sole, may comprise approximately 20% at most, in particular 15% at most, more particularly 10% at most, in particular 5% at most, by mass relative to its mass. total, of one or more contaminating material(s), that is to say which is/are not chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, and vulcanized thermoplastic elastomers.
- Said contaminating material(s) may be chosen from polyurethanes, polyamides or even polyesters (for example polyethylene terephthalate (PET), or polybutylene terephthalate (PBT)). These contaminating materials can come, for example, from recycled materials.
- the footwear item is a boot.
- the boot includes an outsole and an upper.
- the upper includes a lower upper portion covering the foot, particularly the forefoot, instep, medial region, lateral region, and rearfoot.
- the upper also includes an upper upper portion at least partially covering the leg.
- the lower part of the upper and the outsole are co-injected.
- the main sole material is a styrenic thermoplastic elastomer, in particular a SEBS
- the main upper material is a styrenic thermoplastic elastomer, in particular a SEBS.
- the upper upper part comprises one or more foam(s) and one or more textile(s) in at least one auxiliary upper material, in particular chosen from polyolefins.
- the rod may also include one or more foam(s) and/or one or more textile(s) forming an internal liner placed in the receiving space of the foot of the boot and covering all or part of the internal face of the lower part of the injected upper.
- the mass fraction of the main sole material in the sole is greater than or equal to 45%, more preferably greater than or equal to 50%, in particular less than or equal to 70%.
- the outsole may also comprise a first auxiliary sole material, which may be chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, a block copolymer ether-amide (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; and for example a polyolefin, in particular polypropylene.
- a first auxiliary sole material which may be chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, a block copolymer ether-amide (PEBA), an ethylene vinyl acetate
- the mass fraction of the first auxiliary sole material in the sole is greater than or equal to 5% and less than or equal to 40%, in particular less than or equal to 30%.
- the mass fraction of the main rod material is greater than or equal to 40%, more preferably less than or equal to 60%.
- the rod may comprise a first auxiliary rod material which is a polyolefin, in particular polypropylene, whose mass fraction in the rod is greater than or equal to 10%, preferably less than or equal to 35%.
- a first auxiliary rod material which is a polyolefin, in particular polypropylene, whose mass fraction in the rod is greater than or equal to 10%, preferably less than or equal to 35%.
- the ratio of the mass of the main rod material and the mass of the first auxiliary rod material to the total mass of the rod is greater than or equal to 60%, more preferably greater than or equal to 70%.
- the main rod material is selected from one of the following materials: a polyolefin, an olefinic thermoplastic elastomer, or a vulcanized thermoplastic elastomer, preferably from a polyolefin or an olefinic thermoplastic elastomer, more preferably a polyolefin.
- the main sole material is selected from one of the following materials: a styrenic thermoplastic elastomer, a polyolefin, or a vulcanized thermoplastic elastomer.
- the main sole material is a styrenic thermoplastic elastomer.
- the main sole material is a polyolefin, in particular polypropylene.
- the rod comprises a wire comprising a material chosen from polyolefins, styrenic thermoplastic elastomers, elastomers olefinic thermoplastics, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the polyolefin is polypropylene or polyethylene.
- the wire comprises the main rod material.
- the upper comprises a textile component
- the textile component comprises a thread comprising the main upper material
- the main upper material is chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the main upper material is polypropylene or polyethylene.
- the upper comprises a textile part forming a foot receiving zone having an external face, and at least one part, in particular a strip, comprising an olefinic thermoplastic elastomer, said part being secured to said external face of the textile part, and to said sole.
- the textile part forming a reception zone of the foot comprises a textile component, in particular comprising a thread comprising the main upper material chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; more particularly the main rod material is a polyolefin or an olefinic thermoplastic elastomer or a vulcanized thermoplastic elastomer.
- the main rod material is a polyolefin or an olefinic thermoplastic elastomer or a vulcanized thermoplastic elastomer.
- the textile component can be as described in the present text.
- said piece is a piece of imitation leather.
- said part comprises a textile support and a polymeric layer comprising, in particular consisting essentially, more particularly consisting of a material chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes ( TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; and in particular said olefinic thermoplastic elastomer, said polymeric layer being secured to said textile support.
- the face of the part comprising the textile support is oriented facing the external face of the textile part.
- the upper comprises one or more strip(s), more preferably arranged to run along, at least in part, at least one of the following edges of the shoe: the front edge, the medial edge, the side edge, and the rear edge.
- said part(s), in particular band(s), is/are secured to the external face of the textile part forming a foot receiving area, and to the sole.
- said part(s), in particular strip(s), has/have (in particular each) a thickness greater than or equal to 0.5 mm and less than or equal to 3 mm.
- said at least one part, in particular strip is secured to the external face of said textile part, and possibly to the sole, by fusion of at least part of its structure.
- At least part of said at least one part, in particular band is arranged between the sole and the external face of the textile part receiving the foot.
- the olefinic thermoplastic elastomer makes it possible to form a reinforcing part, in particular a reinforcing strip, having an imitation leather appearance, which is compatible with the polymer material(s) of the textile part and the sole so it can be fusion bonded.
- said part is arranged so as to form a covering part of all or part of the top of the foot, in particular comprises an opening for introducing the foot into said covering part.
- the sole comprises a cellular component, in particular a foam, comprising a material selected from one of the following materials: polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; and in particular a styrenic thermoplastic elastomer, an olefinic thermoplastic elastomer, or a polyolefin, preferably from one of the following materials: an olefinic thermoplastic elastomer, more preferably an olefinic thermoplastic elastomer.
- the foam balls are agglomerated into a block, in particular are bonded together to their surfaces by fusion.
- the cellular component has a volume density of between 0.1 g/cm3 and 0.4 g/cm3, preferably between 0.15 g/cm3 and 0.25 g/cm3.
- the cellular component is a midsole.
- the upper comprises a front hard tip comprising the main upper material or an auxiliary upper material, and/or a rear buttress comprising the main upper material or an auxiliary upper material.
- the upper may comprise a rear buttress or a front hard toe comprising, or consisting of, a material chosen from polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether block copolymer -amide (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the upper can thus comprise a rear buttress or a hard front end comprising, or consisting of, a styrenic thermoplastic elastomer, for example SEBS, optionally mixed with at least one polyolefin.
- a styrenic thermoplastic elastomer for example SEBS
- the upper may include a rear buttress or a front hard toe comprising, or made of, a vulcanized thermoplastic elastomer.
- the upper comprises at least one passage eyelet for at least one lacing element
- said at least one passage eyelet comprises a textile strip comprising at least one thread comprising the main upper material or an auxiliary material rod, in particular the main rod material is a polyolefin.
- the upper comprises a foam component comprising the main upper material
- the main upper material is chosen from polyolefins, styrenic thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the upper may comprise one or more complex(es), a complex comprising a textile secured to said foam component, preferably the textile and the foam component comprise (in particular consist of) the main upper material, chosen from polyolefins , styrene thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer , and a polyester; preferably made of polyolefin, for example PP or PE.
- the main upper material chosen from polyolefins , styrene thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (
- Said foam component optionally assembled with a textile, can be placed in the rear heel region of the upper in order to provide comfort and/or in a medial region of the upper and/or in a lateral region of the upper.
- the upper and/or the sole each comprises a recycled material from a sole and/or the upper of another shoe, and/or a recycled material from a sole and/or or the upper of a boot.
- the recycled material preferably comprises the main upper material and/or the main sole material and/or the auxiliary upper and/or sole material(s).
- the other shoe may be a shoe according to the invention.
- the mass of the main rod material, and possibly the mass of the auxiliary rod material(s), on the total mass of the rod is greater than or equal to 40%, preferably greater or equal to 50%.
- the ratio of the mass of said main rod material and the mass of the auxiliary rod material(s), to the total mass of the rod is greater than or equal to 50%, and the material main rod and the auxiliary rod material(s) are selected from polyolefins and olefin thermoplastic elastomers.
- the main sole material covers at least partly the upper, in particular the main upper material.
- the main sole material rises substantially on the forefoot region and/or on the rearfoot region and/or on the medial region and/or on the lateral region of the upper.
- the main sole material is secured to the upper, in particular to the main upper material, without an intermediate bonding agent, for example without a bonding agent or without sewing.
- the mass of the main sole material, and possibly the mass of the auxiliary sole material(s), on the total mass of the sole is greater than or equal to 40%, preferably greater or equal to 50%.
- the ratio of the mass of said main sole material and the mass of the auxiliary sole material(s), to the total mass of the sole is greater than or equal to 50%
- the main sole material and the auxiliary sole material(s) are selected from polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether block copolymer amide (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the article of footwear in particular the shoe, in particular sports shoe, or the upper and/or the sole of the article of footwear, in particular of said shoe, comprises/include (in particular each):
- contaminating material(s) not chosen from polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether block copolymer -amide (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester,
- thermoplastic(s) thermoplastic(s) and/or at most 5% by mass of one or more thermosetting contaminating material(s).
- the mass fraction of contaminant(s) in the shoe is 10 % at most.
- the shoe may still comprise at least 5% by mass of one or more contaminating material(s).
- thermoplastic(s) For example, if the shoe comprises 5% by mass of one or more thermosetting contaminating material(s), said shoe may still comprise at least 5% by mass of one or more contaminating material(s).
- the article of footwear in particular the shoe, in particular a sports shoe, or the upper and/or the sole of the article of footwear, in particular of the shoe, comprises/includes (in particular each):
- the footwear article in particular the shoe, in particular sports shoe, or the upper and/or the sole of the footwear article, in particular the shoe, comprises/include (each):
- thermoplastic contaminant material(s) in particular at most 10% by mass of one or more thermoplastic contaminant material(s) and/or at most 5% by mass of one or more thermosetting contaminant(s).
- thermosetting material in particular contaminating thermosetting material, is understood to mean any material not having a hot transformation temperature by a plastic shaping process, for example by extrusion-injection, extrusion-blowing. , hot pressing (thermocompression), extrusion-spinning.
- thermoplastic material in particular thermoplastic contaminating material, is understood to mean any material having a hot transformation temperature by a process of shaping plastic(s), for example by extrusion-injection, extrusion-blowing, pressure pressing. hot, extrusion-spinning.
- the inventors have advantageously determined that the levels of contaminants depending on whether they are thermoplastic or thermosetting must not exceed certain proportions in the article of footwear so that the latter can be recycled without separation of its different components and that the final recycled material presents satisfactory mechanical properties in many new applications.
- thermosetting contaminants A non-exhaustive explanation, in particular with regard to thermosetting contaminants, is that the contaminant material(s) is/are arranged like nodules in the thermoplastic matrix coming from the main materials, and possibly auxiliary materials, of upper and sole.
- the inventors have determined that the properties of the polymeric mixture resulting from an article of footwear can be improved in a surprising manner by a contaminating material.
- the abrasion resistance of the mixture is improved in a surprising manner when the shoe comprises one or more contaminating material(s) in polyurethane or polyamide, in particular whose mass fraction is at most 10% in the shoe (see table in Figure 5 attached). Above 10%, it has been observed that abrasion resistance decreases.
- the mass fraction of contaminating material(s) in the article of footwear is then preferably greater than or equal to 0.5%, more preferably greater than or equal to 1%.
- the footwear article in particular the shoe, in particular sports shoe, or the upper and/or the sole of the footwear article, in particular the shoe, comprises/include (in particular each) a foam in a contaminating material.
- the sole or upper comprises a foam in a contaminating material which represents at least 30% by volume, preferably at least 40% by volume, more preferably at least 50% by volume, preferably at least 60% by volume. % or 70% by volume, of said sole or said upper.
- said foam in a contaminating material represents at most 10% by mass of the article of footwear, in particular shoes, when the contaminating material is thermoplastic, and/or at most 5% by mass of the article footwear, in particular shoes, when the contaminating material is thermosetting.
- Said foam can be a foamed block or even comprise expanded particles agglomerated together.
- the density of a polyurethane foam ranges from 0.040 Kg/liter to 0.4 Kg/liter, for example of the order of 0.055 Kg/liter while the density of a styrenic thermoplastic elastomer, such as SEBS, is greater than or equal to 0.80 Kg/liter.
- the subject of the invention is an article of footwear, in particular a shoe, more particularly a sports shoe, advantageously comprising, more advantageously consisting essentially of, even more advantageously consisting of:
- a rod a majority by mass of the rod or a majority of the surface of the rod being made of a main rod material, the rod optionally further comprising one or more auxiliary rod material(s);
- a sole a majority by mass of the sole being made of a main sole material, the sole possibly also comprising one or more auxiliary sole material(s); and characterized in that the main upper material, and optionally the auxiliary upper material(s), is/are selected from polyesters and materials chemically compatible with polyesters; and in that the main sole material, and possibly the auxiliary sole material(s), is/are selected from polyesters and materials chemically compatible with polyesters.
- the main upper material may include at least one of the following materials: a thermoplastic copolyester, polyethylene terephthalate.
- thermoplastic copolyester may be a block copolymer comprising rigid segments of polyester and flexible segments of polyether and/or polyester, and in particular TPEE or TPC-ET.
- the upper may comprise a lower part comprising a thermoplastic copolyester which is a block copolymer comprising rigid segments of polyester and flexible segments of polyether and/or polyester, and in particular TPEE or TPC-ET.
- a thermoplastic copolyester which is a block copolymer comprising rigid segments of polyester and flexible segments of polyether and/or polyester, and in particular TPEE or TPC-ET.
- the upper may include an upper portion that includes polyethylene terephthalate or a thermoplastic copolyester that is a block copolymer comprising rigid segments of polyester and flexible segments of polyether and/or polyester, for example TPEE.
- the upper part may include an upper layer of polyethylene terephthalate, a lower layer of polyethylene terephthalate, a central layer of thermoplastic copolymer and surrounded at the top and bottom by an intermediate layer of adhesive, a layer of which upper intermediate layer disposed between the central layer and the upper layer, and a lower intermediate layer disposed between the central layer and the lower layer.
- the intermediate layers of adhesive make it possible to bond the different layers together.
- the intermediate adhesive layer may be polyethylene terephthalate.
- the upper may include a polyethylene terephthalate lace.
- the upper may include lacing eyelets, for example made in the form of a thread embroidered on the upper. Lacing eyelets may be made of polyethylene terephthalate.
- the upper may include a non-woven polyethylene terephthalate upper reinforcement.
- the upper may include a non-woven polyethylene terephthalate tab.
- the article of footwear may include, at the rear of the article of footwear and above a midsole, a reinforcing ring of thermoplastic copolyester.
- the main sole material may comprise at least one of the following materials: a thermoplastic copolyester, a vulcanizate type thermoplastic elastomer thermoplastic (TPV) comprising a soft phase and a thermoplastic phase in thermoplastic copolyester.
- TPV thermoplastic elastomer thermoplastic
- thermoplastic vulcanizate (TPV) type thermoplastic elastomer may comprise a soft phase of poly(styrene/butadiene) and a thermoplastic phase of block copolymer comprising rigid segments of polyester and flexible segments of polyether and/or polyester.
- the thermoplastic phase can thus be TPEE.
- the sole may comprise a midsole comprising a block copolymer comprising rigid segments of polyester and flexible segments of polyether and/or polyester, and in particular TPEE or TPC-ET.
- the sole may comprise an outsole comprising a thermoplastic vulcanizate (TPV) comprising a soft phase of poly(styrene/butadiene) and a thermoplastic phase of block copolymer comprising rigid segments of polyester and flexible segments of polyether, and in particular a thermoplastic phase in TPEE.
- TPV thermoplastic vulcanizate
- the sole may include an outsole comprising rubber.
- the outsole is advantageously fixed to the midsole using a specific bonding primer, which when subjected to heat allows the outsole to be easily disassembled for recycling. of the shoe.
- the article of footwear may comprise an insole comprising a block copolymer comprising rigid segments of polyester and flexible segments of polyether and/or polyester, and in particular the TPEE or the TPC-ET.
- the injected sole may be an outsole or a midsole or a combination thereof.
- the sole is injected directly onto the upper.
- the upper is placed on a foot-shaped preform, then the sole is injected onto the lower part of the upper.
- the lower part of the rod can be a first assembly in connection with the lower edges of the rod (for example when the rod is shaped in three dimensions using weld(s) and/or seam(s) to cover the foot) and/or the textile sole part of a textile upper component.
- the upper textile component may be a planar textile component, shaped in three dimensions so as to form a foot-welding liner, for example by sewing/welding.
- the upper textile component may be a knitted sock comprising an integrated knitted sole portion, in particular heat-fused or heat-compressed.
- the joining is carried out between the upper and the sole without a bonding agent.
- the main and/or auxiliary sole and upper materials selected in the present invention make it possible to manufacture a sole by injecting it directly onto an upper without adhesion problems, thus simplifying the process and reducing the number of different materials used.
- the main sole material is chosen from polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA). ), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- this main sole material has very good adhesion to the main upper material, in particular when it is a polyolefin or an olefinic thermoplastic elastomer.
- the mixture injected to manufacture the sole may comprise, in addition to the main sole material, a plasticizer and/or a filler (for example calcium carbonate) and/or one or more foaming agent(s) (for example if it is (this is the midsole).
- a plasticizer and/or a filler for example calcium carbonate
- one or more foaming agent(s) for example if it is (this is the midsole).
- the plasticizer can be chosen from mineral oils and/or naphthenic or paraffinic oils.
- the injected sole on the upper can be an outsole or a midsole. In the latter case, at least one foaming agent is used mixed with the main sole material.
- the method comprises a step of treating at least part of the surface of the sole, in particular the outsole and/or the intermediate sole, and/or at least part of the surface of the upper, in particular the surface of one or more textile component(s), so as to improve the adhesion of the sole to the upper and/or of the outsole to the sole intermediate and/or a functional component (for example a lateral reinforcement, a front hard toe or even a rear counter) to the textile component(s) of the upper.
- a functional component for example a lateral reinforcement, a front hard toe or even a rear counter
- Said treatment step comprises a light abrasion step (in particular referred to as “buffing treatment” in English), and/or a plasma treatment step, and/or a flame treatment step, and/or a step of corona treatment.
- the main sole material, and possibly the auxiliary sole material(s), is/are derived at least in part from the recycling of at least one other shoe or at least one shoe.
- the method comprises a step of foaming a foam component comprising the main sole material or at least one auxiliary sole material on the sole injected in a softened state so as to at least partially secure said component in foam to said sole, in particular without bonding agent.
- Bi-injection can be performed as described above.
- connection between the foam component and the sole is carried out when the injected sole is in a softened state, that is to say before it is cooled to room temperature.
- the present invention relates, according to another aspect, to a method of recycling at least one article of footwear, in particular a shoe, comprising the collection of at least one article of footwear, in particular a shoe, according to any one of the variants and embodiments according to a first aspect of the invention, or obtained by implementing the manufacturing process according to any one of the variants and embodiments according to a second aspect of the invention, and the transformation of said at least an article of footwear, in particular said shoe, made of thermoplastic granules.
- the article of footwear, in particular shoes, collected is in a first step crushed so as to obtain ground materials, in particular having at least one dimension of the order of at least 1 mm to 40 mm .
- Said crushed materials are sent to an extrusion-granulation device to obtain thermoplastic granules. They can first undergo a washing step to remove dust.
- Thermoplastic granules in this text mean any granule having a hot transformation temperature by a plastic shaping process, for example by extrusion-injection, extrusion-blowing, hot pressing, extrusion-spinning. , injection with supercritical fluid.
- thermoplastic granules thus have the behavior of a thermoplastic material when they are used in a hot transformation process, even if they comprise one or more thermosetting material(s) but in small quantities so as not to alter their ability to be transformed like thermoplastics.
- the extrusion-granulation device is/includes a twin-screw extruder.
- this type of extruder makes it possible to better mix the ground material.
- the transformation step comprises, in particular in this order:
- the compaction step makes it possible to expel the air from the foamed and/or hollow recycled material(s).
- the compaction step is carried out hot by heating said crushed particles, in particular at a temperature greater than or equal to 60°C and less than or equal to 110°C, for example of the order of 70°C to +/- 10°C close.
- the recycling process comprises a step of hot transformation of at least part of said thermoplastic granules for the manufacture of a plastic part, in particular forming at least in part an article for practicing a sport.
- plastic part forming at least in part an article for the practice of a sport that said part can form only part or substantially the entirety of a sporting article.
- Said plastic part comprises one or more recycled material(s), in particular originating from said recycled thermoplastic granules, chosen from polyolefins, olefinic thermoplastic elastomers, styrenic thermoplastic elastomers and vulcanized thermoplastic elastomers, optionally in mixture with one or several other petrosourced and/or bisourced material(s) and/or recycled material(s) and/or not resulting from the recycling process according to the invention.
- recycled material(s) in particular originating from said recycled thermoplastic granules, chosen from polyolefins, olefinic thermoplastic elastomers, styrenic thermoplastic elastomers and vulcanized thermoplastic elastomers, optionally in mixture with one or several other petrosourced and/or bisourced material(s) and/or recycled material(s) and/or not resulting from the recycling process according to the invention.
- Said plastic part is advantageously a fin blade, or even a fin comprising a fin blade and a housing for receiving the foot.
- the plastic part can be a handle, a zipper tip, a wheel, a lamp casing, or even a snorkel tip.
- the plastic part is not limited to recycling in a sporting article but can be used in any application for which the composition of the recycled footwear article has satisfactory mechanical properties.
- plastic is understood to mean any material based on the use of one or more (co)(ter)polymer(s) transformed by a hot process of extrusion-injection, extrusion-molding, extrusion-blowing, thermocompression, or any equivalent technique.
- the present invention relates, according to a final aspect, to a plastic part (in particular molded, more particularly of unitary molded construction), in particular forming at least in part an article for the practice of a sport, capable of being obtained by the recycling method according to any one of the alternative embodiments according to a third aspect of the invention, in particular said part is a fin blade or even a fin comprising a fin blade and a housing for receiving the foot.
- a plastic part in particular molded, more particularly of unitary molded construction
- said part is a fin blade or even a fin comprising a fin blade and a housing for receiving the foot.
- said part is a fin blade or even a fin comprising a fin blade and a housing for receiving the foot, and said part comprises a majority material by mass chosen from polyolefins, styrenic thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester, preferably chosen from thermoplastic styrenic elastomers.
- a majority material by mass chosen from polyolefins, styrenic thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester
- said part comprises a majority material by mass chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), a ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester, the mass fraction of said majority material by mass in said part is greater than or equal to 10%, preferably greater than or equal to 25% , more preferably greater than or equal to 35%, preferably greater than or equal to 45%, in particular greater than or equal to 55%.
- a majority material by mass chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA),
- the mass fraction of said thermoplastic granules recycled in the plastic part is greater than or equal to 10%, preferably greater than or equal to 25%, more preferably greater than or equal to 35%, preferably greater than or equal to 45%. %, in particular greater than or equal to 55%, possibly greater than or equal to 80% or 90%.
- said part comprises a recycled material chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester, preferably chosen from styrenic thermoplastic elastomers, the mass fraction of said recycled material in said part is less than or equal to 25%, preferably less than or equal to 20%, more preferably less than or equal to 15%. In a mode of embodiment, the mass fraction of said thermoplastic granules recycled in the plastic part is less than or equal to 25%, preferably less than or equal to 20%, more preferably less than or equal to 15%.
- the invention also relates to an article of footwear, for example a shoe, and in particular an article of footwear for practicing a sport, obtained by the process according to one of the modes of implementation described above.
- the invention relates to a device for manufacturing at least part of an article of footwear, the device comprising a mold defining an open cavity, a shape of at least part of the cavity corresponding to a shape of a sole of the article of footwear, the cavity being configured to receive, via at least one injection channel opening into the cavity, a mixture comprising a molten material and a supercritical fluid, a rim of an opening of the open cavity being configured to be placed in contact with a docking zone of a surface of at least part of an upper of the article of footwear, so that the surface of the at least one part of the rod ensures closure of the cavity at the level of the contact between the docking zone and the rim, so that said device is thus configured to implement the method according to one of the modes of implementation described herein -Before.
- the device further comprises a cover configured to be placed on the mold so as to form with the mold a closed volume comprising the cavity, and a complementary part of the cavity in said closed volume, the at least a part of the upper of the article of footwear being located inside said closed volume, the complementary part and the cavity being located on either side of the closure of the cavity at the level of the contact between the docking zone and the rim, the device thus being configured to implement the method according to one of the implementation modes described above.
- the device further comprises a support having a shape corresponding to a shape of a foot, an external surface of the support being configured to be covered with at least part of the upper of the article of footwear , the at least part of the surface of the at least part of the upper covering a part of the external surface of the support corresponding to a sole of said foot.
- FIG. 1 is a perspective view of a mold, in a single part, of the cover corresponding to the mold, and of a shoe upper mounted on a support, before the step of placing the upper on the edge of the cavity of the mold, according to one mode of implementation of the invention
- FIG. 2 is a perspective view of a mold, in three parts, of the cover corresponding to the mold, and of a shoe upper mounted on a support, before the step for placing the rod on the edge of the mold cavity, according to one embodiment of the invention
- FIG. 3 is a perspective view of a mold, in part, of the cover corresponding to the mold, and of part of an upper of a shoe, before the step of placing the upper part on the rim of the mold cavity, according to one mode of implementation of the invention
- FIG. 4 is a perspective view of the part of the upper connected to a sole obtained after implementation of the method according to one embodiment of the invention, and of the shoe obtained after implementation of a additional step of assembling the part of the rod with another part of the rod.
- FIG. 5 is a sectional view of a rod with its support, placed on the mold, before the injection step, according to one mode of implementation of the invention; in this figure the mold cover is shown before its placement on the mold
- FIG. 6 is a sectional view of a rod with its support, placed on the mold, under a cover forming with the mold a pressurized closed space on either side of the edge of the mold cavity, before step d injection, according to the mode of implementation of the invention of Figure 5
- FIG. 7 is a perspective view of a rod with its support, placed on the mold, before the injection step, according to the mode of implementation of the invention of Figures 5 and 6; in this figure the mold cover is shown before its placement on the mold
- FIG. 8 is a perspective view of the shoe obtained, with the support of the upper, after implementation of the method according to the mode of implementation of the invention of Figures 5, 6, and 7.
- FIG. 9 is a perspective view of a rod support with a seal placed on a zone of the support corresponding to a docking zone of the surface of the part of the rod, according to the mode of implementation of the invention corresponding to Figures 5, 6, 7 and 8
- FIG. 10 is a perspective view of an upper with an open surface at the part of the upper intended to be taken into the foamed material of the sole obtained according to one embodiment of the invention
- FIG. 11 is a perspective view of another upper with a solid surface at the level of the part of the upper intended to be taken into the foamed material of the sole obtained according to one mode of implementation of the invention
- FIG. 12 is a perspective view of another upper with a perforated surface at the level of the part of the upper intended to be taken into the foamed material of the sole obtained according to one embodiment of the invention
- FIG. 13 is a perspective view of another upper with an openwork or textured surface near the docking zone at the level of the part of the upper intended to be taken into the foamed material of the sole obtained according to a mode of implementation of the invention
- FIG. 14 is a sectional view of a rod with its support, placed on a mold comprising several injection channels, before the injection step, according to one mode of implementation of the invention
- FIG. 15 is a sectional view of a rod with its support, placed on the mold, before the injection step, according to one mode of implementation of the invention in which an injection channel passes through the support of the stem.
- FIG. 16 is a perspective view of inserts configured to be placed in the cavity of the mold so as to be associated with the sole obtained after overmolding with the foamed material, according to one mode of implementation of the invention.
- FIG. 17 is a sectional view of an upper with its support placed on the mold before the injection step, with the inserts placed in the cavity of the mold so as to be incorporated into the foamed material forming the sole, according to a mode of implementation of the invention.
- FIG. 18 is a sectional view of an upper with its support placed on the mold, after the injection step, with the inserts placed in the cavity of the mold and incorporated into the foamed material forming the sole, according to a mode of implementation work of the invention.
- FIG. 19 is a sequencing diagram of the steps of the process, according to one mode of implementation of the invention.
- FIG. 20 illustrates schematically in perspective a first example of a shoe that can be obtained by a method according to the invention.
- FIG. 21 represents the shoe of Figure 20 according to the longitudinal section plane II-II shown in Figure 20.
- FIG. 22 illustrates schematically in perspective a second example of a shoe that can be obtained by a method according to the invention.
- FIG. 23 illustrates schematically in perspective a third example of a shoe that can be obtained by a process according to the invention.
- FIG. 24 is a detailed sectional view of the shoe of Figure 23.
- FIG. 25 is a schematic representation of a contact surface of an insert, the contact surface comprising a texture comprising tubular or cylindrical patterns.
- FIG. 26 is a schematic representation of a contact surface of an insert, the contact surface comprising a texture comprising linear patterns.
- FIG. 27 is a schematic representation of a contact surface of an insert, the contact surface comprising a texture comprising tubular or cylindrical patterns in the center of the surface, and around the edge of the surface a linear pattern.
- FIG. 28 is a perspective representation of a mold according to an exemplary embodiment.
- FIG. 29 is a sectional representation of the mold according to the exemplary embodiment of Figure 28.
- FIG. 30 is a sectional representation of the steps of closing and opening the mold according to the exemplary embodiment of Figure 28.
- FIG. 31 is a sectional representation of the closing and opening steps of a variant of the mold according to the exemplary embodiment of Figure 28.
- FIG. 32 is a sectional view of a rod with its support, placed on the mold, under a cover forming with the mold a pressurized closed space on either side of the edge of the mold cavity, with a pressurization channel of the complementary cavity, according to the mode of implementation of the invention illustrated in Figure 6.
- FIG. 33 is a sectional view of a rod with its support, placed on the mold, under a cover forming with the mold a pressurized closed space on either side of the edge of the mold cavity, with a pressurization channel of the cavity and the complementary cavity, according to the mode of implementation of the invention illustrated in Figure 6.
- FIG. 34 is a sectional view of a rod with its support, placed on the mold, under a cover forming with the mold a pressurized closed space on either side of the edge of the mold cavity, with several pressurization channels of the cavity put in correspondence with the through holes of an insert placed at the level of the external sole, according to the mode of implementation of the invention illustrated in Figure 6
- the invention relates to a method 100 for manufacturing at least part of an article of footwear, for example a shoe 10, shown in Figures 4 or 8, using an injection step 107, in a cavity 2 of a mold 1, of a supercritical mixture comprising a molten thermoplastic material and a gas in a supercritical state, so as to foam the thermoplastic material in order to obtain satisfactory properties of a foamed material which forms a light and cushioning sole 3 of the shoe 10; in particular, Figures 4 or 8 show the part of the shoe 10 obtained at the end of the process 100, with the part 9 of the upper taken from the foamed material of the sole 3.
- the cavity 2 presents at least in part a shape corresponding to the final shape of the foam sole 3 that we wish to obtain; this is illustrated in particular in Figures 3 and 5.
- the dimensions of the shape of the cavity are the dimensions on a scale between 1:0.98 and 1:1.02, and advantageously 1:1, of the shape of the sole of the article of footwear.
- the method consists of putting the cavity 2 of the mold 1 under pressure, in particular by injecting a gas into said cavity 2, before inject the supercritical mixture into cavity 2, then depressurize cavity 2 in order to trigger expansion and foaming of the thermoplastic mixture in cavity 2 in order to obtain the foamed material of the sole 3.
- the cavity 2 comprises an opening with a rim 5 on which is placed a zone 6, called docking zone 6, of a surface 7 of the part of the rod 9, so that the surface 7 of the part of the rod 9 ensures closure of the cavity at the level of the contact between the docking zone 6 and the rim 5.
- a particularly advantageous solution may be the use of counter pressure in the area of the rod 9 which is not immersed in the cavity 2, ie in the area of the rod which is on the other side of the closure by relative to the cavity 2.
- said zone of the rod 9 which is immersed in the cavity 2 is located in the lower part of the figure, and the part of the rod 9 which is not immersed in the cavity is located above the line joining the two points of the docking zone 6, designated by the references 5, 6 in Figures 5 and 6.
- the pressurization of the cavity 2 is accompanied by the simultaneous creation of a counter-pressure, advantageously identical to the pressurization pressure of the cavity 2, in the zone of the rod 9 which is not immersed in the cavity 2, ie in the area of the rod which is on the other side of the closure in relation to cavity 2, the counter pressure makes it possible to avoid leaks, at the level of the contact between the docking area and the rim , cavity pressurization gas
- the method 100 comprises for example a step 103bis of placing a cover 13 on the mold 1 so as to form with the mold 1 a closed volume comprising the cavity 2, and a complementary part 14 of the cavity 2 in said closed volume, the complementary part 14 and the cavity 2 being on either side of the closure of the cavity 2 at the level of contact between the docking zone 6 and the edge 5.
- Figure 6 in particular shows the cover 13 placed on the mold 1, in order to form the closed volume comprising the cavity 2 on the one hand and the complementary volume 14 on the other hand; the surface 7 of the part of the upper 9 intended to be taken into the foamed material of the sole 3 is located inside the cavity 2 of the mold 1, and the surface of the other part of the upper is located inside the interior of the complementary part 14 of the cavity 2 in the closed volume formed by the cover 13 placed on the mold 1.
- the cover 13 of the mold 1 is shown above the mold which corresponds to it, but those skilled in the art will understand that the process works just as well with a mold 1 above the cover 13 as is illustrated by way of example in Figure 1 in perspective.
- seals 15 can also be placed at a contact zone between the cover 13 and the mold 1 to ensure appropriate sealing of the closed volume constituted by the cover 13 and the mold 1 .
- the complementary part 14 is pressurized, for example by injecting a gas into said complementary part 14 at a pressure similar to the pressure of the cavity 2 so that the sealing defects at the level of the zone 6 and the rim 5 do not create a leak of a pressurizing gas between the cavity 2 and the complementary part 14, the pressure in the complementary part 14 acting as counter pressure opposing the pressure in the cavity 2.
- the injection 107 of the supercritical mixing in cavity 2 can then take place, for example via an injection channel 4 passing through the mold 1, as illustrated in Figure 6.
- pressurization channels 119, 119bis distinct from the injection channel(s) 4 of the mixture, as illustrated in Figures 32 and 33.
- a pressurization channel 119 can be used for the pressurization of the cavity 2
- a complementary pressurization channel 119bis can be used for the pressurization of the complementary cavity 14, as illustrated in Figure 33.
- the cover 13 is configured to form with the mold 1 a closed volume, in particular gas-tight, around at least part of the rod 9, so as to allow the creation of said counter. -pressure inside this sealed closed volume, in particular by receiving the pressurizing gas of the cavity 2 in this sealed volume, in order to avoid leaks, at the level of the contact between the docking zone and the rim, of a pressurizing gas of the cavity.
- the zone of at least part of the rod 9 on the other side of the closure with respect to the cavity 2 can be depressurized simultaneously with the depressurization of the cavity 2 of the mold 1 to trigger an expansion of the mixture in the cavity 2 and form the sole during the process 100 according to the invention.
- a pressurization pressure of the cavity is between 3 bars and 50 bars, preferably between 10 bars and 30 bars, preferably equal to 15 bars.
- - provide 103 a mold 1 defining an open cavity 2, a shape of at least part of the cavity 2 corresponding to a shape of a sole 3 of the shoe 10, the cavity 2 being configured to receive, via at least one injection channel 4 opening into cavity 2, a mixture comprising a molten material and a supercritical fluid;
- the process makes it possible to obtain, in a single injection step 107, a light and shock-absorbing sole of the shoe 10 connected to a part of an upper 9 of the shoe 10, with good resistance to detachment of the shoe. the sole 3 and the upper 9.
- Pressurization in cavity 2 followed by depressurization in cavity 2 allows the mixture to expand and obtain the light, cushioning foamed material of the sole.
- a pressurization pressure in the complementary part 14 of the closed volume makes it possible to ensure tightness, in particular to gas, of the closure of the cavity 2, at the level of the contact between the docking zone 6 and the rim 5.
- the melted material is for example an elastomeric thermoplastic polymer.
- the thermoplastic polymer is a thermoplastic polyurethane (TPU), or an ether-amide block copolymer (PEBA), or an ethylene vinyl acetate (EVA), or a polyolefin, or an ether-ester block copolymer, or a styrene-based elastomer, or a mixture of these different components.
- TPU thermoplastic polyurethane
- PEBA ether-amide block copolymer
- EVA ethylene vinyl acetate
- polyolefin or an ether-ester block copolymer, or a styrene-based elastomer, or a mixture of these different components.
- the supercritical fluid is for example nitrogen in a supercritical state or carbon dioxide in a supercritical state or a mixture of nitrogen and carbon dioxide in a supercritical state.
- the density of the sole 3 finally obtained is between 0.1 g/cm3 and 0.4 g/cm3, preferably between 0.15 g/cm3 and 0.25 g/cm3.
- the part of the upper 9 taken in the foamed material of the sole 3 makes it possible to obtain a peeling resistance greater than 2.5 N/mm, measured according to the ISO NE EN 1392 standard.
- step 105bis of pressurizing cavity 2 may for example comprise the following step:
- - place 103 bis a cover 13 on the mold 1 so as to form with the mold 1 a closed volume comprising the cavity 2, and a complementary part 14 of the cavity 2 in said closed volume, the at least part of the rod 9 being located inside said closed volume, the complementary part 14 and the cavity 2 being on either side of the closure of the cavity 2 at the level of the contact between the docking zone 6 and the rim 5.
- a pressurization pressure in the complementary part 14 of the closed volume makes it possible to avoid leaks, at the level of the contact between the docking zone 6 and the rim 5, of a pressurization gas from the cavity 2.
- part 9 of the rod is placed directly on the rim 5 of the opening of the cavity 2 of the mold 1, without using a support 8 to hold the rod.
- the method may comprise a complementary step of assembling the part of the upper 9 connected to the sole 3 obtained after the depressurization step, with another part 9' of the upper, the assembly forming the shoe 10 , as illustrated in Figure 4.
- the assembly step may include sewing the other part 9' of the upper with the part of the upper 9 connected to the sole 3.
- the part 9 of the rod is first placed on a support 8 so as to cover 102 at least in part an external surface of said support 8, said support 8 having a shape corresponding to the shape of a foot; a part of the surface 7 of the part of the upper 9, intended to be taken into the foamed material of the sole 3, covers a part of the external surface of the support 8 corresponding to a sole of said foot.
- the closed volume further comprises the support 8 with the part of the rod 9; the surface 7 of the part of the rod 9 intended to be taken in the foamed material of the sole 3 is inside the cavity 2 of the mold 1, with a corresponding part of the support 8, and the surface of the other part of the upper 9, with another corresponding part of the support 8, is located inside the complementary part 14 of the cavity 2 in the closed volume formed by the cover 13 placed on the mold 1.
- the rod 9 can for example be a complete rod, as illustrated for example in Figure 7.
- the support 8 can be made, for example, of aluminum, steel, or plastic.
- the method 100 makes it possible to obtain, in a single injection step 107, a complete shoe 10 comprising a sole 3 of the shoe connected to a complete upper 9 of the shoe 10, as is illustrated in Figure 8.
- the mold 1 is in a single part, or the mold 1 comprises several parts 1', 1", 1"', as illustrated in Figure 2, and the step of providing 103 of the mold 1 includes a step of assembling the different parts 1', 1”, 1” to form the mold 1.
- the mold in several parts 1', 1”, 1'” may include a mold base 1”', and two halves 1', 1” of a ring part of the mold, as shown in Figure 2; said two halves 1', 1” are configured to form a ring when they are assembled, said ring being configured to form the rim 5 of the cavity 2 when placed on the bottom 1'” of mold 1, said rim 5 then being configured to receive the docking zone 6 of the part of the rod 9.
- one or more joints 15 ' can also be placed at a zone of contact between the different parts 1 ', 1 ”, 1 ' ” of the mold to ensure appropriate sealing of the mold 1.
- the mold comprises a mold base 1'” and two halves 1', 1” of a ring part of the mold, in a manner similar to the mold in the figure 2; note that in Figure 28, the mold base 1’” is above the two halves 1’ and 1” of the ring part, while in Figure 2, the mold base is below; those skilled in the art will understand that this difference in representation is not significant.
- said two halves 1 'and 1' of the ring part are configured to form a ring when they are assembled, said ring being configured to form the rim 5 of the cavity 2 when placed on the mold base 1'”, said rim 5 then being configured to receive the docking zone 6 of the part of the rod 9.
- said mold base 1' comprises two distinct parts, on the one hand a cover 115, on the other hand a bell 114, said bell 114 being configured to envelop the whole parts including the cover 115 and the two halves 1', 1” of the ring part, when the mold is closed; More particularly, the two halves 1', 1” of the ring part of the mold are configured to be mechanically actuated so as to be moved relative to each other, sliding in a sliding direction, a first half 1 'moving in a direction D' of the sliding direction, and the second half 1” moving in an opposite direction D” to the sliding direction, so that the two halves 1', 1” of the ring move away from each other as illustrated in Figures 30c or 31c, or come closer to each other as illustrated in Figures 30a or 31a, depending on whether the sliding movement of the two halves is done in a first direction, illustrated in Figures 30c or 3 le, or in a second direction illustrated in Figures 30a or 3 la
- a contact interface between the bell 114 of the mold base 1'' and each of the two halves 1', 1'' of the ring is configured so that the sliding movement of the two halves in the direction of separation of the two halves 1', 1” of the ring actuate a movement of the bell 114 of the bottom of the mold 1'” in a direction D'” transverse to the direction of sliding, so that the bell 114, initially in contact with the 'closed ring formed by its two halves 1', 1” close together, deviates from the ring when its two halves 1', 1” deviate from each other.
- the contact interface between the bell 114 of the mold base and each of the two halves 1', 1” of the ring comprises a first contact plane 114' between the bell 114 of the mold bottom 1' " and the first half 1' of the ring, said first contact plane 114' being inclined relative to the direction of sliding at a first angle, and a second contact plane 114” between the bell 114 of the mold bottom 1’” and the second half 1” of the ring, said second contact plane 114” being inclined relative to the direction of sliding at a second angle, the second angle being of opposite sign to the first angle.
- Said first contact plane 114' is configured to slide in contact with a first corresponding contact surface 116' of a wall of the first half 1' of the ring
- said second contact plane 114” is configured to slide in contact with a second corresponding contact surface 116' of a wall of the second half 1” of the ring.
- the contact interface between the bell 114 of the mold base l'” and each of the two halves 1', 1” of the ring comprises at least one guide 117’, 117” configured to accompany the sliding movement of the two parts 1’ and 1” of the ring when the bell 114 of the bottom of the mold 1’” moves in the direction transverse to the direction of sliding.
- the mold can be actuated alternatively, to be closed, by moving the bottom of the mold 1'"in the direction D"' transverse to the direction of sliding, and to be opened, by sliding movement of the two halves 1 ', 1 ” so as to open the ring.
- the movement of the mold base 1'' for closing can be obtained, for example, by pressure exerted on the mold base 1'' towards the ring; sliding movement of the two halves 1', 1” for opening can be obtained, for example, by an elastic device.
- the cavity 2 of the mold is configured to receive, via at least one injection channel 4, 4', 4", 4"' opening into the cavity 2, the mixture comprising a melt and a supercritical fluid.
- the mold may include an injection channel 4 opening into the cavity 2, as illustrated in FIG. 6.
- the injection channel 4 opening into the cavity 2 can pass through the support 8 of the rod 9, as illustrated in Figure 15.
- the cavity 2 is configured to receive the mixture via at least two injection channels 4', 4", 4'" opening into the cavity 2, as is illustrated in Figure 14 in which are shown , for example, 3 injection channels 4', 4”, 4'”.
- the process 100 makes it possible to obtain more quickly, and with a more homogeneous filling of the mold cavity, a sole 3 of the shoe 10 connected to a part of the upper 9 of the shoe 10.
- the part of the surface 7 of the part of the rod 9 may comprise hot melt wires configured to melt at a injection temperature of the mixture. This increases the resistance to separation of the sole and upper.
- the part of the surface 7 of the part of the upper 9, intended to be taken into the foamed material of the sole 3, is solid as illustrated in Figure 11.
- the part of the surface 7 of the part of the upper 9, intended to be taken into the foamed material of the sole 3 is perforated, ie the part of the surface 7 includes holes as illustrated in Figure 12 or in Figure 3 with for example 3 holes passing through the part of the surface 7 of the part of the rod 9; it is also possible to provide that the part of the surface 7 is at least partly open as is illustrated in Figure 10 with for example said part of the surface 7 almost completely open except for a part of this surface 7 close to the docking zone 6.
- the cover 13 In the case shown in Figure 3, in which 3 holes pass through the part of the surface 7 of the part of the rod 9, and in which the part of the rod 9 intended to be taken in the foamed material of the sole 3 is not placed on a support 8, the cover 13 must ensure the closure of the holes or openings of the part of the surface 7 of the part of the upper 9 during the steps 105bis of pressurization of the cavity 2 and injection 107 of the mixture into the cavity.
- the cover 13 can for example, as illustrated in Figure 3, be supported, for example with a surface substantially flat and plane interior, on said part of the surface 7 of the part of the rod 9 so as to close the holes or openings present on this part of the surface 7 of the part of the rod 9.
- Yet another way of reinforcing the resistance to detachment consists of providing that the part of the surface 7 of the part of the upper 9, intended to be taken into the foamed material of the sole 3, is textured or perforated in contact or near of the docking zone 6, as illustrated in Figure 13.
- the method 100 may comprise the complementary steps of providing 104 and positioning 104bis of one or more inserts 12, 12' , 12” configured to be positioned in cavity 2 of mold 1.
- the insert(s) 12, 12' shown in Figure 16 are positioned to be inserted at an external surface of the sole, as illustrated respectively before and after the injection step 107 of the mixture. in cavity 2 in Figures 17 and 18; according to another example, an insert or several 12” inserts can be positioned to be embedded inside the sole 3, as is illustrated respectively before and after the step 107 of injecting the mixture into cavity 2 in Figures 17 and 18.
- the abrasion resistance of the sole is reinforced, or the rigidity of the sole is improved, depending on whether the inserts 12, 12' are respectively inserted towards an external portion of the sole 3, for example with inserts 12, 12' in rubber or thermoplastic material, or that the insert is or the 12” inserts are embedded inside the sole 3, for example with 12” inserts in carbon plate or thermoplastic material .
- a 12” insert positioned to be inserted at an external surface of the sole 3 comprises one or more through holes 120, the through hole(s) 120 being matched with one or more pressurization channels 119, as illustrated in Figure 34, so that a pressurization gas can pass through the insert.
- a contact surface 112 between the insert and the sole has a particular geometry, in order to reinforce, by mechanical attachment, the adhesion between the insert and the sole, avoiding the steps gluing or surface preparation.
- the particular geometry of the insert includes a texture of the contact surface, as illustrated in Figures 25, 26 or 27.
- the texture comprises for example a plurality of patterns formed on the contact surface 112, the plurality of patterns being distributed over the surface, according to a determined density, so that on a portion of the contact surface the plurality of patterns occupies a part of the portion of the contact surface, said part being between 1% and 15%, advantageously 6%, of the portion of the contact surface.
- the patterns are preferably distributed homogeneously on the contact surface, according to the determined density.
- the distribution of the patterns can also be densified in certain areas of the contact surface for which the stresses are greater. In other words, the density of distribution of the patterns on an area of the contact surface can be a function of the stresses to which the area considered is subjected.
- the patterns have a height, measured in a direction of the height transverse to the contact surface, said height being between 1 mm and 10 mm, preferably equal to 1.6 mm.
- the patterns have a thickness, measured in a direction transverse to the direction of height; said thickness being between 1 mm and 2 mm, preferably equal to 1.6 mm. Said thickness is a diameter, respectively a width, depending on whether the patterns are tubular or cylindrical as illustrated in Figure 25, respectively linear as illustrated in Figure 26.
- the texture may include tubular or cylindrical patterns in the center of the contact surface and a linear pattern on a periphery 113 of the contact surface, as illustrated in Figure 27, in order to avoid the beginnings of detachment.
- the linear pattern on the periphery may be a burr obtained on a joint plane of a closure of a mold for overmolding the insert, which makes it possible to avoid eliminating said burr.
- the invention also relates to an article of footwear, for example a shoe 10 obtained by the method 100 according to one of the modes of implementation previously described.
- the invention also relates to a device comprising a mold 1, and possibly a cover 13, and possibly a support s, configured to implement the method 100 according to one of the modes of implementation previously described.
- the device comprises a mold 1 defining an open cavity 2, a shape of at least part of the cavity 2 corresponding to a shape of a sole 3 of the shoe 10, the cavity 2 being configured to receive, via at least one injection channel 4, 4', 4", 4'" opening into the cavity 2, a mixture comprising a molten material and a supercritical fluid, a rim 5 of an opening of the open cavity 2 being configured to be placed in contact with a docking zone 6 of a surface 7 of at least part of an upper 9 of the shoe 10, so that the surface 7 of the at least one part of the rod 9 ensures closure of the cavity at the level of the contact between the docking zone 6 and the rim 5, so that said device is thus configured to implement the manufacturing method 100 according to one of the examples implementation described above.
- the device further comprises a cover 13 configured to be placed on the mold 1 so as to form with the mold a closed volume comprising the cavity 2, and a complementary part 14 of the cavity in said closed volume, the at least part of the upper 9 of the shoe being located inside said closed volume, the complementary part 14 and the cavity 2 located on either side of the closure of the cavity 2 at the level of the contact between the docking zone 6 and the rim 5, the device thus being configured to implement the manufacturing method 100, according to the one of the implementation modes described above.
- the device further comprises a support 8 having a shape corresponding to the shape of a foot, an external surface of the support 8 being configured to be covered with at least part of the rod 9 of the shoe, the at least part of the surface 7 of the at least part of the upper 9 covering a part of the external surface of the support corresponding to a sole of said foot.
- the shoe 10 shown in Figure 20 comprises a sole obtained by the method 100 described above; a majority by mass of the sole is made of a main sole material; in other words the foamed material, resulting from the expansion of the mixture used in process 100, comprises said main sole material; the shoe 10 further comprises an upper 30, a majority of which by mass is made of a main upper material.
- the main sole material can be chosen from polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), a vinyl ethylene acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- the main sole material is for example a styrenic thermoplastic elastomer, in particular chosen from SEBS (possibly grafted), SBS, SBC, SIS, and SEPS, in this specific example SEBS.
- SEBS possibly grafted
- SBS SBS
- SBC SBC
- SIS SIS
- SEPS SEPS
- the main sole material is advantageously chosen from polyesters, thermoplastic polyurethanes (TPU), polyolefins, and block copolymers composed of rigid polyamide blocks and flexible polyether blocks (and in particular the compound marketed under the name Pebax® by the Arkema company).
- the sole 20 may comprise a first auxiliary sole material, in particular a polyolefin, more particularly it is polypropylene, the foamed material, resulting from the expansion of the mixture, comprising said main sole material and the first auxiliary sole material. sole.
- a first auxiliary sole material in particular a polyolefin, more particularly it is polypropylene, the foamed material, resulting from the expansion of the mixture, comprising said main sole material and the first auxiliary sole material. sole.
- the main rod material may be chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), a vinyl ethylene acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; and by example a polyolefin, in particular polyethylene or polypropylene, in this specific example polypropylene.
- polyolefins in particular polyethylene or polypropylene, in this specific example polypropylene.
- the main upper material is advantageously chosen from polyesters, thermoplastic polyurethanes (TPU), polyolefins, and block copolymers composed of rigid polyamide blocks and flexible polyether blocks (and in particular the compound marketed under the name Pebax® by the Arkema company).
- the upper 30 comprises a lace 35 made of polypropylene, in particular comprising braided polypropylene threads.
- the rod 30 comprises a component 40 folded on itself and comprising a foam laminated on its two faces with a textile chosen in particular from polyolefins, styrenic thermoplastic elastomers, olefmic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester.
- a textile chosen in particular from polyolefins, styrenic thermoplastic elastomers, olefmic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copo
- the textiles are preferably made of polypropylene and/or polyethylene, in particular a fabric or knitted fabric with polypropylene yarns and/or polyethylene yarns, preferably polypropylene yarns.
- the foam can be chosen from polyolefins, styrene thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), a block copolymer ether-ester, a styrene-based elastomer, and a polyester; for example polyethylene foam.
- the upper 30 may also include a foam component 50 housed in the fold of the external component 40, preferably made of polyethylene, said foam improves the reception of the rearfoot.
- the foam can be chosen from polyolefins, styrenic thermoplastic elastomers, olefin thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), a block copolymer ether-ester, a styrene-based elastomer, and a polyester
- the edges of the component 40 folded back on itself can be secured using any technique known to those skilled in the art, for example using one or more seam(s), preferably made with one or more threads made of a material chosen from polyolefins, styrenic thermoplastic elastomers, olefin thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), a vinyl ethylene acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester, in particular one or more polyolefin threads, in particular polypropylene.
- the upper component 40 is arranged in the rearfoot region 12a and partly in the medial 18 and lateral foot regions 16.
- the upper 30 further comprises the upper component 42 arranged in the forefoot regions 14a, and partly in the lateral 16 and medial 18 foot regions.
- the upper component 42 may comprise a knit or fabric.
- the rod 30 may include other rod component(s). All of the rod components including components 40 and 42 are preferably shaped in three dimensions using a mounting base.
- the insole comprises a material chosen from selected from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA ), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; for example a non-woven polyolefin, in particular polypropylene.
- the insole is advantageously heat-fused along all or part of its surface to improve its resistance to tearing.
- the upper 30 comprises, as well as preferably any upper according to the invention, a rearfoot region 12a, a forefoot region 14a, a lateral region 16, a medial region 18 and an instep region. -foot 19 including a tongue.
- the shaping of component 40, with possibly other rod component(s), on a foot-shaped preform is carried out for example using a cord comprising a material chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; and in particular a polypropylene cord (for example a circular braid not shown) coming to tension the lower edges of the textile component 40 and possibly the other stem component(s).
- a cord comprising a material chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers
- the shoe 10 may also include lacing eyelets 55 in the molded main upper material, for example lacing eyelets 55 in polypropylene.
- the shoe 10 may also comprise a non-woven polypropylene or polyethylene coated in whole or in part with a poly(ethylene-vinyl acetate) (EVA) coating making it possible to join together by gluing, when the EVA is activated by heating , the lacing eyelets 55 to the external textile component 50.
- EVA poly(ethylene-vinyl acetate)
- the shoe 10 may comprise textile strips 60 and 61, in particular woven, of polyethylene and/or polypropylene, in particular comprising polypropylene threads and/or polyethylene threads, in particular polypropylene threads.
- Each textile strip 60 and 61 includes a lacing zone 62 forming a sheath for the passage of a lace.
- the textile strips 60 and 61 preferably each have a width 11 and 12 greater than or equal to 5 mm, in particular greater than or equal to 10 mm, more particularly greater than or equal to 15 mm.
- the textile strip 60 comprises a first end 64 and a second end 66 secured to the component 40. The first and second ends 64,66 are spaced from one another so that the textile strip 60 forms an inverted V .
- the textile strip 61 comprises a first end 65 and a second end 67, substantially superimposed, and secured to the component 40.
- the lacing zone 62 comprises a part folded on itself of the textile strip 60 or 61 and thus forming a sheath for the passage of a lace.
- the textile strips 60 and 61 also form lateral reinforcement zones.
- the upper 30 may include a rear buttress 70 secured in the rear foot region 14 of the component 40.
- This rear buttress 70 is preferably a molded part in polypropylene.
- the rod 30 may also comprise a hard front end 90 in a molded material, for example in the main rod material, preferably in a polyolefin, an olefinic thermoplastic elastomer, or even a vulcanized thermoplastic elastomer, or a styrenic thermoplastic elastomer, such as than the SEBS.
- the main rod material of the rod 30 is a polyolefin, in particular polypropylene. It is in fact the basic thermoplastic material whose mass fraction is the majority, that is to say the largest compared to the mass fractions of other materials.
- the rod 30 also comprises a first auxiliary rod material, different from the main rod material, which in this specific example is polyethylene.
- the mass fraction of polyolefin in the rod is of the order of 55.17%
- the mass fraction of polypropylene (main rod material) in the rod is of the order of 44.83%
- the mass fraction of polyethylene (first auxiliary rod material) is of the order of 10.34%
- the mass fraction of thermoplastic olefin elastomer (TPO) in the rod is of the order of 27.59% (second auxiliary rod material)
- the mass fraction of glue is of the order of 17.24%.
- the ratio of the mass of the main rod material 30, in this specific example polypropylene, and the mass of the auxiliary rod materials 30, for example PE and TPO, relative to the total mass of the rod 30, is greater than or equal to 80%, in particular of the order of 82% or more if the glue used is EVA. This ratio preferably tends towards 100%.
- the materials are recycled, there may remain one or more contaminant material(s) whose mass fraction remains low, for example of the order of 5% or less.
- the sole 20 is manufactured at the same time as it is attached to the upper.
- the sole is injected directly onto the upper, that is to say on the lower part of the upper 30.
- the main material of the upper 30 is compatible with, or in the same basic thermoplastic material as, the main sole material, so that the sole adheres to the upper, preferably without using an external liaison officer.
- the mass fraction of the main sole material, in particular SEBS, in the sole is of the order of 65%.
- the mass fraction of polyolefin, in particular polypropylene mixed with SEBS, in the sole is of the order of 20%.
- the mass fraction in charge (for example calcium carbonate) in the sole is of the order of 5%.
- the mass fraction of plasticizer in the sole is around 10%.
- the shoe 10 essentially comprises a material chosen from polyolefins, styrenic thermoplastic elastomers, olefinic thermoplastic elastomers, vulcanized thermoplastic elastomers, thermoplastic polyurethane (TPU), an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA). ), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; and in particular polypropylene, polyethylene, TPO and SEBS, SEBS being the majority in the sole and polypropylene being the majority in the upper. Shoe recycling is thus made easier since it is not necessary to separate the different components.
- thermoplastic granules capable of being transformed by a classic technique for shaping thermoplastics.
- the thermoplastic granules therefore comprise a thermoplastic mixture comprising the materials selected in the present invention which are compatible with each other during their hot transformation, and have good adhesion between them.
- thermoplastic granules can thus advantageously be extruded and injected to manufacture all or part of an outsole or a midsole.
- Thermoplastic granules can also be transformed to make a front hard toe or a rear counter or even lacing eyelets, a foam component or foam balls, agglomerated or not.
- Figure 22 represents a second example cited without limitation of a shoe 200 according to the invention, comprising a sole 220 and an upper 230.
- the main upper material can be chosen from polyolefins, thermoplastic styrenic elastomers, elastomers olefinic thermoplastics, vulcanized thermoplastic elastomers, thermoplastic polyurethanes (TPU), polyamides, an ether-amide block copolymer (PEBA), an ethylene vinyl acetate (EVA), an ether-ester block copolymer, a styrene-based elastomer, and a polyester; preferably in this specific example a polyolefin, in particular polypropylene.
- the upper 230 comprises a textile part 240 forming a foot receiving zone having an external face 245, and four bands 250,251,252 in an olefinic thermoplastic elastomer secured to the external face 245 and to said sole 220. A part of each strips are arranged between the sole 220 and the external face 245 of the textile part 240.
- a strip 250 is arranged along the front edge 205 of the shoe 200, and extends from a lateral side towards a medial side of the shoe 200.
- a strip 251 is arranged along the rear edge 206 of the shoe 200, and s extends from a lateral side towards a medial side of the shoe 200.
- a strip 252 is arranged partly along the medial side 207 of the shoe 200, and extends between the front strip 250 and the rear strip 251.
- strip not visible in the photograph of Figure 4, is arranged partly along the medial side of the shoe 200, and extends between the front strip 250 and the rear strip 251.
- the textile part 240 forming a foot receiving zone comprises a textile component which comprises a thread comprising the main upper material, in particular the main upper material is a polyolefin or an olefinic thermoplastic elastomer.
- the four bands are imitation leather type bands.
- each strip comprises a polymer layer based on an olefinic thermoplastic elastomer, said polymer layer being placed on a textile substrate.
- Said strips are thus advantageously compatible with the polymer material(s) of the textile part 240 and the sole 220 so that they can be bonded by at least partial fusion of their structures to the textile part 240 and to the sole 220.
- Said strips including the strips 250-252 are glued to the external face 245 of the textile part 240 so that the textile substrates are oriented facing the external face 245.
- the band such as one of the bands 250 to 252 may have a configuration different from that of a band depending on the functions to be performed on the shoe.
- said strip can be a piece of imitation leather type having a shape determined according to its final function.
- the external faces of the strips 250 to 252 are substantially smooth, but they may include one or more relief pattern(s) imparted to the polymer layer, for example by calendering.
- Figure 23 represents a third example cited without limitation of a shoe 80 according to the invention.
- the shoe 80 comprises a sole comprising an intermediate sole 21 and an outsole 22, the majority by mass of the sole being made of a main sole material, and an upper 36, a majority of which by mass is made of a main upper material.
- the main sole material is polyester.
- the main material of the midsole 21 may be a thermoplastic copolyester of the TPEE (thermoplastic polyether ester elastomer in English) or TPC-ET (Thermoplastic copolyester elastomers) type. These are block copolymers comprising rigid segments of polyester and flexible segments of polyether and/or polyester.
- TPEE thermoplastic polyether ester elastomer in English
- TPC-ET Thermoplastic copolyester elastomers
- the main material of the midsole 21 may be a thermoplastic copolyester, called COPE (“Copolyester thermoplastic elastomer” in English) or TPC (“Thermoplastic Copolyester” in English), of the TPC-EE type (“TPC with soft segments with both ether and ester linkages” in English), TPC-ES (“TPC with soft segments with ester linkages” in English) or TPC-ET (“TPC with soft segments with ether linkages” in English).
- COPE Copolyester thermoplastic elastomer” in English
- TPC Thermoplastic Copolyester” in English
- TPC-EE type TPC with soft segments with both ether and ester linkages” in English
- TPC-ES TPC with soft segments with ester linkages” in English
- TPC-ET TPC with soft segments with ether linkages” in English
- the midsole 21 can be obtained by injection of supercritical fluid, as described previously.
- the midsole 21 is advantageously co-molded with the outsole 22.
- the outsole 22 can also be bonded with the midsole 21.
- the midsole 21, equipped or not with the outsole 22, can be injected onto the upper.
- the sole and the upper 36 can be produced separately and assembled subsequently.
- the main material of the outsole 22 can be chosen from TPV type thermoplastic elastomers.
- thermoplastic vulcanizates fall into the class of thermoplastic elastomers, and have, to a certain degree, the characteristics of thermoplasts and elastomers. As a general rule, these are systems formed of two phases, one soft, the elastic phase (EPDM) and the other hard, the thermoplastic phase (PP).
- thermoplastic vulcanizate comprising a thermoplastic phase made of thermoplastic copolyester, and in particular TPEE, is preferably used.
- the soft phase can be made of poly(styrene/butadiene), also called SBR rubber (for styrene - butadiene rubber in English), which is a copolymer of styrene and 1,3-butadiene.
- the thermoplastic phase may be a block copolymer thermoplastic phase comprising rigid segments of polyester and flexible segments of polyether and/or polyester.
- the outsole 22 may comprise rubber.
- the outsole 22 is advantageously fixed to the intermediate sole 21 using a specific bonding primer which allows the outsole 22 to be disassembled with a view to recycling the shoe.
- the shoe 80 may also include an insole made of TPEE or TPC-ET, which can be obtained by foaming by injection of supercritical fluid, as described above.
- the main upper material is also preferably a polyester.
- the rod 36 comprises a lace 23 made of polyethylene terephthalate (PET).
- the shoe 80 may include lacing eyelets 24 made of polyethylene terephthalate (PET).
- the upper 36 may include a lower part 25 which is a protective layer glued to the upper.
- the lower layer 25 is advantageously made of thermoplastic copolyester, and in particular of the TPEE or TPC-ET type.
- the upper 36 may also comprise an upper part 26 comprising polyethylene terephthalate (PET) and/or a thermoplastic copolyester, for example TPEE.
- PET polyethylene terephthalate
- TPEE thermoplastic copolyester
- Figure 21 shows an exemplary embodiment of the upper part 26.
- the upper part 26 may comprise an upper layer 26a of PET, for example a PET mesh woven in two dimensions, and a lower layer 26b also of PET, for example a three-dimensional woven PET mesh.
- a central layer 26c of thermoplastic copolymer, for example TPEE, and in particular non-woven TPEE, is surrounded upwards and downwards by an intermediate layer of adhesive 26d, 26e.
- An upper intermediate layer 26d is disposed between the central layer 26c and the upper layer 26a, while a lower intermediate layer 26e is disposed between the central layer 26c and the lower layer 26b.
- a reinforcing ring 27 which is a rigid injected insert, the insert being positioned in the mold, and assembled or not with the upper.
- the ring 27 is advantageously made of thermoplastic copolyester, and in particular of the TPEE or TPC-ET type.
- the ring 27 can be glued between the upper 30 and the midsole 21.
- the upper 36 may also include an upper foam reinforcement 51 improving the reception of the rearfoot.
- the upper reinforcement 51 can be made of PET, and in particular of non-woven PET.
- the upper 36 includes a rearfoot region 28, a forefoot region 29, a lateral region 31, a medial region 32 and an instep region 33 including a tongue 34.
- the tongue 34 is advantageously made of PET, and in particular of non-woven PET.
- the upper may comprise a polyester thread, in particular TPEE, which gives flexibility to the shoe.
- TPEE polyester thread
- the outsole 22 is preferably manufactured at the same time as it is secured to the upper. In this case, the outsole is injected directly onto the upper, that is to say on the lower part of the upper 36, preferably with the process described above.
- the main material of the upper 36 is compatible with, or in the same basic thermoplastic material as, the main sole material, so that the outsole adheres to the upper, preferably without the use of an external bonding agent.
- the shoe 80 can be manufactured using a classic Strobel type assembly.
- the outsole 22 can be secured to the upper 36 by gluing.
- the outsole 22 and the upper 36 are therefore manufactured separately, then joined together.
- the adhesives that can be used to assemble the different parts of the shoe 80, and in particular to assemble the upper to the sole, can be adhesives based on polyurethane or polyester.
- the mixture in Example 1 comes from the recycling of a shoe that does not contain any contaminating material within the meaning of this text.
- the recycled shoe to obtain the mixture of Example 1 thus comprises 50g of polypropylene (PP), 12g of polyethylene (PE), 250g of styrene-ethylene-butadiene-styrene (SEBS), and 25g of a thermoplastic elastomer vulcanized (TPV, in this specific example EPDM (ethylene-propylene-diene)/PP (polypropylene)).
- the shoe recycled to obtain the mixture of Example 2 is identical to the shoe of Example 1 with the difference that the sole of the shoe recycled in this Example 2 comprises thermoplastic polyurethane whose mass fraction is 2% .
- the shoe recycled from the mixture of Example 3 is identical to the shoe of Example 2 with the difference that the mass fraction of thermoplastic polyurethane in the shoe is 5%.
- the recycled shoe from the mixture of Example 4 is identical to the shoe of Example 2 with the difference that the mass fraction of thermoplastic polyurethane in the shoe is 10%.
- the shoe of the mixture of Example 5 is identical to the shoe of Example 1 with the difference that the shoe of Example 5 comprises 2% by mass of thermoplastic polyamide coming from a buckle and buckle fastening system. polyamide hooks from recycled shoes.
- the recycled mixtures obtained are perfectly transformable hot (extrusion-injection or blowing, or by hot pressing, extrusion molding, etc.) while maintaining final properties allowing them many new applications.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Molding Of Porous Articles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2210476A FR3140739B1 (fr) | 2022-10-12 | 2022-10-12 | Procédé de fabrication d’au moins une partie d’un article chaussant, par exemple une chaussure, une sandale, une botte, etc., et notamment un article chaussant pour la pratique d’un sport. |
| FR2303432 | 2023-04-06 | ||
| PCT/FR2023/051523 WO2024079406A1 (fr) | 2022-10-12 | 2023-10-02 | Procédé de fabrication d'au moins une partie d'un article chaussant, par exemple une chaussure, une sandale, une botte, etc., et notamment un article chaussant pour la pratique d'un sport |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4601869A1 true EP4601869A1 (fr) | 2025-08-20 |
Family
ID=84819824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23793433.6A Pending EP4601869A1 (fr) | 2022-10-12 | 2023-10-02 | Procédé de fabrication d'au moins une partie d'un article chaussant, par exemple une chaussure, une sandale, une botte, etc., et notamment un article chaussant pour la pratique d'un sport |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP4601869A1 (fr) |
| JP (1) | JP2025534163A (fr) |
| KR (1) | KR20250087647A (fr) |
| CN (1) | CN120018948A (fr) |
| DE (1) | DE202023003090U1 (fr) |
| FR (1) | FR3140739B1 (fr) |
| MX (1) | MX2025004297A (fr) |
| TW (2) | TW202430365A (fr) |
| WO (1) | WO2024079406A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2037866B1 (en) * | 2024-06-05 | 2025-12-23 | What The Future B V | Process to prepare a footwear product |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886238A (en) * | 1988-02-25 | 1989-12-12 | Davis John M | Apparatus for molding footwear |
| US20090236030A1 (en) * | 2008-03-19 | 2009-09-24 | Vertex, L.L.C. | Molding process and apparatus |
| DE102015206900B4 (de) * | 2015-04-16 | 2023-07-27 | Adidas Ag | Sportschuh |
| TW201906556A (zh) * | 2017-07-06 | 2019-02-16 | 捷欣企業股份有限公司 | 鞋材的製備方法 |
| US11745456B2 (en) * | 2018-08-28 | 2023-09-05 | Nike, Inc. | Method for forming a footwear midsole |
| DE102019204579B4 (de) * | 2019-04-01 | 2022-10-06 | Adidas Ag | Recycling eines Schuhs |
| CN112120351B (zh) * | 2019-06-24 | 2021-08-17 | 安踏(中国)有限公司 | 一种鞋类一体成型的生产方法 |
| US11447615B2 (en) * | 2019-09-12 | 2022-09-20 | Nike, Inc. | Foam compositions and uses thereof |
-
2022
- 2022-10-12 FR FR2210476A patent/FR3140739B1/fr active Active
-
2023
- 2023-10-02 CN CN202380072274.9A patent/CN120018948A/zh active Pending
- 2023-10-02 EP EP23793433.6A patent/EP4601869A1/fr active Pending
- 2023-10-02 JP JP2025520805A patent/JP2025534163A/ja active Pending
- 2023-10-02 DE DE202023003090.0U patent/DE202023003090U1/de active Active
- 2023-10-02 KR KR1020257015405A patent/KR20250087647A/ko active Pending
- 2023-10-02 WO PCT/FR2023/051523 patent/WO2024079406A1/fr not_active Ceased
- 2023-10-11 TW TW112138703A patent/TW202430365A/zh unknown
- 2023-10-11 TW TW112210888U patent/TWM664531U/zh unknown
-
2025
- 2025-04-10 MX MX2025004297A patent/MX2025004297A/es unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MX2025004297A (es) | 2025-07-01 |
| JP2025534163A (ja) | 2025-10-14 |
| TWM664531U (zh) | 2024-12-21 |
| WO2024079406A8 (fr) | 2024-05-16 |
| TW202430365A (zh) | 2024-08-01 |
| KR20250087647A (ko) | 2025-06-16 |
| WO2024079406A1 (fr) | 2024-04-18 |
| CN120018948A (zh) | 2025-05-16 |
| FR3140739B1 (fr) | 2025-03-21 |
| DE202023003090U1 (de) | 2026-04-23 |
| FR3140739A1 (fr) | 2024-04-19 |
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