Classifications

• • 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
  • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
  • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
  • B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
  • B29C59/025—Fibrous surfaces with piles or similar fibres substantially perpendicular to the surface
• • 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
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
  • B29C33/3814—Porous moulds
• • 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
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
  • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
• • 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
  • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
  • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
  • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
• • 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
  • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
  • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
  • B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
  • B29C2059/023—Microembossing
• • 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
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24174—Structurally defined web or sheet [e.g., overall dimension, etc.] including sheet or component perpendicular to plane of web or sheet
  • Y10T428/24182—Inward from edge of web or sheet

Definitions

• the present invention relates to an installation for manufacturing a sheet, in particular in the form of a strip, in particular of thermoplastic material, having a face from which rods originate, in particular made of the same material as the strip, in particular 'a room with the, band.
• the present invention also relates to a sheet, in particular in the form of a base strip, in particular made of thermoplastic material, having one face from which rods originate, in particular of the same material as the strip, in particular of a room with the band.
• the stems are not hooks. They have a right longitudinal axis and a cross section perpendicular to this longitudinal straight axis which is constant or decreasing from the base to the top of the stem.
• a device for forming a rod-shaped web having a base from which rods made of a thermoplastic material and having a straight axis and whose cross section in a plane parallel to that of the base is constant or decreasing from the base to the top of the rod, having a forming roll in which are formed cavities of complementary shape of the rods to be formed, is characterized in that the forming roll, at the less in part, especially in the form of a layer, is a porous material with open pores, the porosity being chosen so that air molecules can pass through but that molecules of thermoplastic material can not, the arrangement being such that said portion of a porous material delimits at least in part each cavity, including a portion of the bottom thereof.
• the forming roll comprises at least an upper layer of a first material and a lower layer of a second material, the first material being capable of being hollowed out or machined, the second material being made of a porous material , the cavities being formed by digging or machining in the first material until flush with the second material which thus forms at least a portion of the bottom.
• the lower layer is constituted by the outer surface (excluding the upper layer) of the roller itself, for example by the hub of the roller, which for example may be porous ceramic.
• thermoplastic material when forming the stem ply by introducing thermoplastic material into the cavities, especially at a melt index at the time of entry of the material in the cavity of between 9 and 150 g / 10 min, this material is not "braked” by the air that can escape through the porous material.
• the molten or liquid thermoplastic material even in the case of very thin and / or very deep cavities, can reach the bottom of the cavity, and the rods obtained after extraction have a dimension substantially equal in height to the depth of the cavity. cavity.
• the machining or digging is done by laser etching, the outer surface of the lower layer serving as a stop surface for the laser beam (for example using a laser to periscopic viewfinder, in which the laser beam is deactivated (it receives back too much energy by reflection) when it reaches the surface of the second material.
• the porosity is chosen so that the pores have an equivalent diameter (diameter of the circular section of the same section as that of the pores) of less than 50 micrometers, in particular so that it is between 10 and 40 micrometers.
• the cavities are formed by machining the material by micro drilling, in particular a layer of plastic material, or by electroerosion, in particular a layer of metallic material. The combination of the use of the porous material and the electroerosion or micro-drilling machining makes it possible to obtain particularly fine and high stems, with a high degree of reproducibility, the final height of the stems corresponding almost exactly to those of the cavities.
• the shape of the cavities can be chosen at will.
• the device for forming a rod ply having at the output of the forming roll a first thickness, a first length and a first width, comprises an upstream roller and a downstream roller arranged downstream of the forming roller. one after the other in the direction of the length (direction machine), the downstream roll having a rotational speed greater than that of the upstream roll, the distance between the two rollers being small, so that the tablecloth at the output of the device has a second thickness smaller than the first thickness and a second length greater than the first length.
• it has a width substantially identical to the first width, the variation being small, the width passing for example from 400 mm to 370 mm.
• the downstream roll is cold, that is to say at a temperature below the softening temperature of the stretched thermoplastic material, for example being of the order of 25 ° C.
• the upstream roll is hot; that is, at a temperature equal to or higher than the softening temperature (Vicat point) of the thermoplastic material of the web.
• Vicat point softening temperature
• the inter roller distance is substantially equal to the initial total thickness of the rod web.
• the inter-roll distance is between 0.5 mm and 10 mm, for example between 0.7 mm and 3 mm.
• the rod ply is subjected to heating on the side of the opposite strip to the stems, prior to stretching.
• the present invention therefore also aims at overcoming the drawbacks of the prior art by proposing a rod ply which has very thin rods and which can be used in particular in combination with a fabric to obtain a particularly effective anti-slip function between the ply. and the tissue, without degrading the latter.
• rod plies can be obtained very simply by the method and the device according to the invention.
• a rod ply is as defined in one of claims 4 to 14.
• a rod ply consists of a strip and at least one rod projecting from the strip of a piece with it, in particular of the same material as the strip, the at least one rod having a straight axis and a cross section perpendicular to the straight axis which is constant or decreasing from the base to the top of the rod, is characterized in that the at least one rod has a height, measured along its axis and a width, corresponding to its largest dimension measured parallel to the plane of the strip, the width being between 0.05 mm and 0.250 mm, in particular between 0.071 mm and 0.250 mm, for example between 0.15 mm and 0.23 mm, in particular between 0.071 mm and 0.185 mm, more preferably between 0.075 mm and 0.185 mm and the ratio of the height of the stem to its width is at least greater than 2, preferably greater than or equal to 3.
• a web with rods consisting of a strip and at least one rod projecting from the strip of a piece with it, in particular of the same material as the strip, the least one rod having a straight axis and a cross section perpendicular to the straight axis which is constant or decreasing from the base to the top of the rod, is characterized in that the at least one rod has a height, measured along the its axis and a width, corresponding to its largest dimension measured parallel to the plane of the strip, at least a crown portion of the at least one rod is of conical shape, and the ratio of the height of the rod to its width is at least greater than 2, preferably greater than or equal to 3.
• the height of the at least one rod is between 0.2 mm and 0.8 mm, in particular between 0.3 mm and 0.8 mm, preferably between 0.4 mm and 0 mm. , 6 mm.
• the width of the at least one rod is between 0.05 mm and 0.250 mm, for example between 0.15 mm and 0.23 mm, in particular between 0.071 mm and 0.250 mm. mm, in particular between 0.075 mm and 0.250 mm, more preferably between 0.075 mm and 0.23 mm.
• the strip has a thickness measured in the direction of the axis of the at least one rod less than 0.1 mm, in particular between 0.03 and 0.09 mm.
• the at least one rod comprises a first lower conical portion and at least a second upper conical portion, in particular a conical crown portion, whose conicity (defined by its upper half angle) is greater than that of the first part, in particular being between 3 ° and 20 °.
• This at least double conicity ensures a particularly effective action of the anti-slip system.
• the at least one rod comprises a first straight cylindrical lower portion and at least a second conical upper portion, in particular a conical crown portion, whose conicity (defined by its upper half angle) is between 3 ° and 20 °.
• the at least one rod has a free end in the form of a dome, in particular a spherical shape, and in particular with a radius of curvature of between 0.025 mm and 0.080 mm, in particular between 0.033 mm and 0.054 mm. .
• the axis of the at least one rod is with the plane of the base an angle between 70 ° and 110 °, in particular is substantially equal to 90 °.
• at least a portion of the outer surface of the at least one rod, in particular an apex portion of at least one rod has an arithmetic roughness measured according to the ISO standard (Ra or average roughness difference, ie say the arithmetic mean of all the ordinates of the profile in a base length) less than 400 nm, preferably less than 300 nm, more preferably less than 250 nm.
• a rod ply is thus obtained which degrades very little the tissues (in particular a knit or a woven fabric) with which it co-operates for an anti-slip action.
• At least a portion of the outer surface of the at least one rod has a statistical roughness Rms of less than 450 nm, preferably less than 350 nm, more preferably less than 275 nm.
• the present invention also relates to an assembly according to claim 1, improvements being defined in claims 2, 3 and 7 to 14.
• Figure 1 is a side view of a rod ply according to the invention
• Figure 2 is a cross-sectional view taken along the line A-A of Figure 1
• Figure 3 is an overview of a manufacturing facility according to the invention
• FIG. 4 schematically shows in more detail the forming roll of the installation of FIG. 3.
• a ribbon ply in the longitudinal direction comprising a strip or base 1 of thermoplastic material, for example polyolefin, such as polyethylene, polypropylene or the like, which are derived from a piece of rods 2 of the same material.
• thermoplastic material for example polyolefin, such as polyethylene, polypropylene or the like, which are derived from a piece of rods 2 of the same material.
• the rods 2 are substantially cylindrical having a domed top.
• the rods 2 have a lower part of small conicity, the half-angle at the top being about 3 ° (this part could also be straight) and a conical upper part, whose half-angle at the top is 15 °. It could be for example between 3 ° and 20 °.
• the stems are arranged in rows and columns. The pitch of a row, that is to say the distance between two successive rods in a row, is at the lower choice, equal to or greater than the pitch of the columns.
• the pitch of the rods or inter-rod distance is in the direction CD equal to at least 0.23 mm and 0.23 mm in the MD direction .
• the height of the rod is preferably between 0.300 and 0.800 mm, in particular between 0.400 and 0.600 mm. In Figure 1, it is 0.441 mm.
• the width of the rods at the level of the base is between 0.100 and 0.200 mm, and in particular is 0.197 mm in the machine direction (direction of unwinding of the strip and direction in which the stretch is performed) and is 0.180 mm in the transverse direction (direction CD), the section of the rod here being slightly oval.
• the width of the rods may especially be between 0.15 mm and 0.23 mm.
• the ratio of the height to the width of the stem at its base is equal to 2.39. It is greater than 2. Preferably, it is greater than or equal to 3 or 4.
• the thickness of the strip off the stems is 0.034 mm. It may especially be between 0.02 and 0.15 mm, preferably between 0.03 and 0.09 mm.
• FIG. 3 there is shown a plant for manufacturing a rod ply according to the invention.
• a forming roller 10 having cavities 11 of cylindrical conical shape, complementary to the shape of the rods (like those of FIGS. 1 or 2) that are to be obtained at the outlet, molten or liquid thermoplastic material is passed through. at the outlet of a feed nozzle. The material passes around the forming roll, between it and a pressure roll which presses the melt into the excess cavities thereof. After removal of the pressure and cooling, optionally by an additional cooling device, there is obtained a sheet having a strip of a thickness substantially corresponding to one gap between the two rollers and rods whose shape corresponds substantially exactly to that of the cavities .
• a heater 50 is disposed upstream of the upstream roll 30 and preheats the back of the unrolled web to facilitate stretching.
• the speed of the first roll is greater than 2 to 4 times the speed of the second roll.
• the upstream roll 30 is heated to a temperature greater than or equal to the softening temperature (Vicat point) of the thermoplastic material and the downstream roll 40 is cold, ie less than this cooling temperature.
• Vicat point softening temperature
• width variability (CD direction) of the band in the direction of its length (MD direction) is very small.
• the forming roll 10 is shown in section in Figure 3, which is not to scale.
• the roll has an outer peripheral annular layer 20 of laser etchable material, especially a rubber, especially a thermosetting material, or a plastics material or metal.
• This layer is in contact with a lower layer 21, also annular in a material hard enough to withstand the laser attack, for example in stainless steel or copper.
• this material is made to be breathable and impervious to the usual thermoplastic material, the material being said to be microporous with open pores with a diameter of less than 0.050 mm in size, in particular 0.01 to 0.04 mm. mm.
• a material of this type is for example the SIKA-R 100IS available from the company GKN Sinter Metals filters under the name Seamless Filter tube.
• a compression mold is used.
• the cavities are laser-formed by attacking the material of the outer layer until reaching the lower layer where the attack is "stopped".
• the lower layer will then form a part of the bottom of the cavity and when the thermoplastic material is pressed into the cavity, even in the case of very thin conical cavity it is not prevented from reaching the bottom by an accumulation of air at the bottom, the air being evacuated by the pores of the porous material. It is thus possible to obtain very thin conical rods.
• the stems of the ply co-operate with the tissue by penetrating the tissue, for example by inserting into the voids formed by the threads constituting the fabric or having its end which is inserted between two son that touch in the case of very tight patterns, especially in the case of woven.
• An anti-slip effect is thus obtained between the ribbon ply on the one hand and the tissue on the other hand.
• the great fineness of the stems means that this penetration or insertion does not deteriorate the fabric.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)
• Treatment Of Fiber Materials (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)
• Nonwoven Fabrics (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Paper (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2007
  • 2007-07-13 FR FR0705083A patent/FR2918677A1/fr not_active Withdrawn
• 2008
  • 2008-07-15 MX MX2010000461A patent/MX2010000461A/es unknown
  • 2008-07-15 US US12/452,483 patent/US20100129601A1/en not_active Abandoned
  • 2008-07-15 BR BRPI0812951-7A2A patent/BRPI0812951A2/pt not_active Application Discontinuation
  • 2008-07-15 EP EP08828562A patent/EP2178690A2/de not_active Withdrawn
  • 2008-07-15 CN CN200880021542A patent/CN101687363A/zh active Pending
  • 2008-07-15 AU AU2008291991A patent/AU2008291991A1/en not_active Abandoned
  • 2008-07-15 CA CA 2692491 patent/CA2692491A1/fr not_active Abandoned
  • 2008-07-15 KR KR1020107000677A patent/KR20100043046A/ko not_active Withdrawn
  • 2008-07-15 JP JP2010515553A patent/JP2010533244A/ja active Pending
  • 2008-07-15 WO PCT/FR2008/001029 patent/WO2009027602A2/fr not_active Ceased
• 2009
  • 2009-11-30 ZA ZA2009/08462A patent/ZA200908462B/en unknown

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