EP4079964B1 - Procédé de fabrication d'un papier pouvant être scellé à chaud - Google Patents

Procédé de fabrication d'un papier pouvant être scellé à chaud

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Publication number
EP4079964B1
EP4079964B1 EP21169546.5A EP21169546A EP4079964B1 EP 4079964 B1 EP4079964 B1 EP 4079964B1 EP 21169546 A EP21169546 A EP 21169546A EP 4079964 B1 EP4079964 B1 EP 4079964B1
Authority
EP
European Patent Office
Prior art keywords
heat
wax
type
weight
sealable
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.)
Active
Application number
EP21169546.5A
Other languages
German (de)
English (en)
Other versions
EP4079964A1 (fr
EP4079964C0 (fr
Inventor
Ralf Lemitz
Michael Steuernagel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Drewsen Spezialpapiere & Co KG GmbH
Original Assignee
Drewsen Spezialpapiere & Co KG GmbH
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Drewsen Spezialpapiere & Co KG GmbH filed Critical Drewsen Spezialpapiere & Co KG GmbH
Priority to EP21169546.5A priority Critical patent/EP4079964B1/fr
Publication of EP4079964A1 publication Critical patent/EP4079964A1/fr
Application granted granted Critical
Publication of EP4079964B1 publication Critical patent/EP4079964B1/fr
Publication of EP4079964C0 publication Critical patent/EP4079964C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/46—Non-macromolecular organic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/46—Non-macromolecular organic compounds
    • D21H19/48—Diolefins, e.g. butadiene; Aromatic vinyl monomers, e.g. styrene; Polymerisable unsaturated acids or derivatives thereof, e.g. acrylic acid
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch

Definitions

  • the invention relates to a process for producing heat-sealable paper, in which a heat-sealable coating based on a heat-sealable polymer is applied to a paper web, and the paper web is subsequently rolled up onto the application of the heat-sealable coating.
  • the invention particularly relates to a heat-sealable coating composition used in the production of the heat-sealable paper.
  • Such heat-sealable coating compositions contain an antiblocking agent to prevent the paper web from sticking to itself during rolling or subsequent storage.
  • Known antiblocking agents include, for example, platelet-shaped pigments based on kaolin.
  • Heat-sealable packaging papers are suitable for the production of bag packaging and filling of dry goods, such as pudding powder or vanilla sugar, but also for the packaging of other everyday items, such as screws or sewing utensils.
  • the current state of the art involves the production of heat-sealable paper using a two- or three-pass process on a paper machine, possibly a coating machine, and then a film laminating or extrusion line.
  • Previous attempts to produce heat-sealable paper using a single-pass process directly on a paper machine with an integrated coating unit have failed due to the limited application weight and the strong tendency of the hot paper web to block in the post-dryer and/or reel sections.
  • the WO 2018/200783 A1 shows a method for producing a heat-sealable paper having the features of the preamble of claim 1. Further prior art is described in US 5 336 528 A , WO 2017/024211 A1 and US 4 196 247 A discussed.
  • the aim of this invention is to develop a heat-sealable paper that can be produced in a 1-pass process (online process) on a paper machine with a integrated coating application unit (for example a film press) and a conventional paper drying in the after-dryer section (for example air-turn, IR radiators and steam-heated cylinders) and can be rolled up without blocking at 50°C to 65°C.
  • a 1-pass process online process
  • a paper machine with a integrated coating application unit for example a film press
  • a conventional paper drying in the after-dryer section for example air-turn, IR radiators and steam-heated cylinders
  • the heat-sealing line contains wax in the disperse phase of at least one first wax type, wherein the melting point of the at least one first wax type is above the maximum drying temperature of the paper web to be rolled up.
  • the melting temperature of the at least one wax type is above the melting point of the heat-sealable polymer.
  • the invention proposes a synthetic or semi-synthetic wax as an antiblocking agent, which is present in the heat-sealable coating composition as a dispersed phase.
  • the wax of the at least one first wax type in the dispersed phase has a largely spherical shape with a diameter of 1 - 6 ⁇ m.
  • the addition of at least one first wax type in dispersed form reduces the stickiness of the heat-sealable coating composition at temperatures below the melting point of the heat-sealable polymer.
  • the paper temperature had to be strictly limited during winding to prevent deposits on the drying cylinders of the coating dryer and blocking of the paper web after winding.
  • winding can take place in the range of 50°C to 65°C without blocking.
  • the wax contains a second wax type whose melting point lies between the maximum drying temperature of the paper web to be rolled up and the melting point of the first wax type.
  • the melting point of the second wax type is chosen between the melting temperature of the heat-sealable polymer and the melting point of the first wax type.
  • a wax type with a melting point close to the melting point of the heat-sealable polymer improves the heat-sealability of the coating and can simultaneously act as an anti-blocking agent.
  • the weight fraction of the heat-sealable polymer in the coating can be reduced, so that the tendency to block is reduced simply by reducing the polymer content in the coating.
  • the addition of the second wax type largely, ideally completely, compensates for the reduced heat-sealability of the coating.
  • the melting point of the first type of wax is selected in a range between 105 and 164 degrees Celsius and in particular between 115 and 164 degrees Celsius or between 156 and 164 degrees Celsius.
  • the melting point of the second wax type is selected in a range from 86 to 164 degrees Celsius, preferably between 100 to 150 degrees Celsius, particularly preferably between 100 and 121 degrees Celsius and in particular between 100 and 115 degrees Celsius or at 105 degrees Celsius.
  • adding only the second wax type i.e., without the first wax type, can lead to improvements of the same, greater, or lesser magnitude than adding the first wax type.
  • particularly advantageous results can be achieved by a coordinated dosage of the first and second wax types.
  • the weight fraction of the first wax type is selected in a range from 2% to 25% by weight when the first wax type is used alone in the wax mixture, and in the range from 2% to 15% by weight when the first and second wax types are used in the wax mixture, preferably at 5% by weight.
  • the inventive use of the amount of the first wax type, or of the second wax type, or of a mixture of the first and second wax types exceeds the amount usually used of less than 1% for paper applications in which waxes are used for purposes other than that of an antiblocking agent.
  • the first type of wax is based on ethylene acrylic acid.
  • Ethylene acrylic acid wax is a synthetic wax with a relatively low melting temperature, i.e., a melting temperature close to the melting temperature of the heat-sealable polymer. It has been shown that the use of this wax, in addition to acting as an anti-blocking agent, also improves the sealing strength of the heat-seal coating.
  • the heat-sealing coating is applied to the paper web as a single coat with a basis weight in a range of 2g/m 2 to 7g/m 2 .
  • the coating applications of the heat-sealing coating are greater than 7 - 10 g/m 2 .
  • these relatively large coating applications increase blocking.
  • the amount of coating applied can also be reduced if a particularly dense base paper is used as the base paper through high refining and the use of a hydrophobic agent as a substrate, which ensures that the coating remains particularly well on the paper surface.
  • a further aspect of the invention is that the weight proportion of the second type of wax in the heat seal line, based on 100% weight proportion of the polymer, is in the range of 3% to 10%, preferably 6%.
  • a further aspect of the invention is that the second wax type, or if only one wax type is used, the first wax type, is a synthetic wax based on secondary fatty acid amide waxes.
  • PE or PP waxes are also suitable for the second wax type.
  • synthetic waxes these waxes have a relatively high melting point compared to the melting point of the heat-sealable polymer.
  • a further aspect of the invention is that the heat seal coating additionally contains 5% to 40% by weight of a platelet-shaped pigment based on kaolin, based on 100% by weight of the heat sealable polymer.
  • a further aspect of the invention is that the heat seal coating additionally contains 0.1% to 1% by volume of acrylate copolymer based on 100% by weight of the heat sealable polymer.
  • a further aspect of the invention is that the heat seal coating additionally contains 0.01% to 0.2% by volume of fatty alcohols based on 100% by weight of the heat sealable polymer.
  • thermoplastic polymer consists of at least polyolefin or polypropylene ethylene acrylate polymers, or polyethylene polymers.
  • a further aspect of the invention is that a front side coating is applied to the opposite side of the paper web with a coating application quantity between 2g/m 2 and 8g/m 2 .
  • a further aspect of the invention is that the front coating contains 20 to 80 percent by weight of a platelet-shaped pigment based on kaolin and 80 to 20 percent by weight of modified starch. Modifications of the front coating can also be directed toward other properties, such as improving gravure printing properties.
  • a manufacturing process for a heat-sealable paper comprises the following process steps: production of a base paper in a paper machine with a basis weight (according to EN ISO 536) of 30 g/m 2 to 150 g/m 2 ; direct application of a heat-seal coating according to one of the process steps described above; and winding up the paper web.
  • a heat seal coating composition according to the invention is defined in claim 13.
  • the temperature difference between the melting point of the synthetic or semi-synthetic wax and the maximum drying temperature of the paper web to be rolled up should be in a range between 1 and 60 degrees Celsius and in particular between 5 and 30 degrees Celsius and in particular between 5 and 15 degrees Celsius.
  • the melting point of the first type of wax is in a range of 100 to 110 degrees Celsius, preferably 105 degrees Celsius.
  • a further aspect of the invention is that the heat seal coating composition, based on 100% by weight of the heat sealable polymer, the weight fraction of the second wax type is in the range of 2% to 15% by weight, preferably 5% to 6% by weight.
  • a further aspect of the invention is that the second type of wax is based on ethylene acrylic acid.
  • a further aspect of the invention is that the wax of the heat seal coating composition present in the disperse phase contains a second type of wax whose weight proportion, based on 100% weight proportion of the polymer, is in the range of 3% to 10%, preferably 6%, wherein the second type of wax has a lower melting point than the first type of wax, preferably a melting point in the range of 100 degrees Celsius to 110 degrees Celsius and wherein the second type of wax is based on secondary fatty acid amide waxes.
  • the heat seal coating composition contains 5% to 40% by weight of a platelet-shaped pigment based on kaolin; 0.1% to 1% by volume of acrylate copolymer; 0.01% to 0.2% by volume of fatty alcohols; the heat sealable polymer consists of at least polyolefin or polypropylene-ethylene-acrylate polymers, or polyethylene polymers.
  • a further aspect of the invention also includes the arrangement for producing a heat-sealable paper web comprising a paper machine for producing a base paper web, a coating device for applying a heat-sealable coating composition according to one of the above coating compositions, a coating device for applying a reverse side coating composition, a drying device and a reel-up for winding up the paper web.
  • the starting point, or process step 1 is the production of a base paper in a paper machine with a basis weight (according to EN ISO 536) between 30 g/ m2 and 150 g/ m2 .
  • the refined pulp preferably has a freeness of 40 - 65 degrees Schopper Riegler (according to EN ISO 5267-1/2).
  • the base paper preferably has a pulp composition of bleached pulp with a proportion of long fibers 10% - 80% and short fibers 20% to 90%. If necessary, the base paper is treated with a wet strength agent, such as polyamidoamine epichlorohydrin resin, at a usage rate of between greater than 0 L/t and 18 L/t.
  • a heat-sealing coating is then applied directly to one side of the base paper using a film press as a single coating, preferably with a basis weight of 2 g/m 2 - 7 g/m 2 , and then dried.
  • the properties of the high-quality paper pulp complement the innovative composition of the heat-sealing coating, which is why the applied heat-sealing coating, at 2 g/m 2 to 7 g/m 2, can be significantly less than the conventionally applied coatings of 10 g/m 2 . This also helps prevent blocking of the wound paper web.
  • the heat-sealable coating is applied on one side and has the following basic coating components: a heat-sealable binder such as modified starch or synthetic binder based on styrene butadiene or polyacrylate; a pigment, preferably platelet-shaped, for example kaolin; a mixture of synthetic and semi-synthetic waxes; optionally a lubricant, for example based on calcium stearate or PE, which improves printability. if necessary, a rheological aid and, if necessary, a defoamer.
  • a heat-sealable binder such as modified starch or synthetic binder based on styrene butadiene or polyacrylate
  • a pigment preferably platelet-shaped, for example kaolin
  • a mixture of synthetic and semi-synthetic waxes optionally a lubricant, for example based on calcium stearate or PE, which improves printability.
  • Table 1 shows Chemical basis Melting point degrees Celsius Weight percentage absolutely dry heat-sealable polymer polyolefins, 85 100 First wax type as an anti-blocking agent Wax based on secondary fatty acid amide waxes, so-called ethylene bistereamide waxes 140 - 150 3 - 6 - 10 Second type of wax as an anti-blocking agent to improve heat sealing properties Synthetic wax based on ethylene acrylic acid 105 2 - 5 - 15 Antiblocking agents Platelet-shaped pigment based on kaolin - 5 - 40 Rheology setting Acrylate copolymer - 0.1 - 1.0 Defoamers Fatty alcohols - 0.01 - 0.2
  • a pigmented coating is applied directly to the opposite side to compensate for curl and adjust other required paper properties, such as achieving a barrier against grease and mineral oils and/or achieving printability with gravure or flexographic inks.
  • the coating application rates for this reverse coating range from 0.8 g/ m2 to 8 g/ m2 .
  • Table 2 function Chemical basis Melting point degrees Celsius Weight percentage absolutely dry pigment Platelet-shaped pigment based on kaolin - 20 - 80 binder Modified starch - 80 - 20
  • the main advantage of the proposed composition of the heat seal coating is that the heat sealable paper can be produced in a single operation because the risk of blocking during winding of the heat sealable paper is significantly reduced.
  • step 4 involves rolling up the paper web, preferably at a temperature range of 50°C to 65°C.
  • the heat-sealable paper produced in this way exhibits good heat-sealability.
  • the heat-sealable paper can also be designed for good recycling, allowing it to be reused in the waste paper cycle.
  • the back coating can be used to achieve "special properties," such as a barrier against grease/mineral oils or printability with gravure/flexographic printing.
  • Cold tack, a cold peel test, and hot tack, a hot peel test are well-known methods for measuring adhesive strengths.
  • Table 3 shows that the tensile strengths for hot tack are higher than for cold tack at sealing temperatures between 90°C and 110°C, but drop rapidly above this temperature.
  • the maximum achievable tensile strengths are somewhat lower than with hot tack, but remain largely constant over a temperature range of 90°C to 130°C, with a maximum at approximately 130°C.
  • Hot tack peel forces enable rapid processing of the sealing seam, for example in bag production and bag packaging.
  • the heat-sealable polymers used are listed in the following table.
  • the heat-sealable polymers are: commercially available aqueous dispersions with different solid contents.
  • the waxes used for this invention to prevent deposits in the drying of the paper machine and to prevent blocking of the paper web after winding on the drum without prior cooling of the paper web are shown in Table 6.
  • Table 6 Waxes used to prevent deposits in the drying process and to prevent blocking in the reel after winding Chemistry Semi-synthetic wax, amide wax based on ethylenebistearamide Synthetic wax, polyethylene wax Synthetic wax, polypropylene wax Vegetable wax, soy wax Melting point °C 140-150 115-121 156-164 68 Average particle size h ⁇ m 5 4 6 1 charge non-ionic non-ionic non-ionic anionic
  • Table 7 shows formulations V1-0, V1-1, V1-2, V1-3, and V1-4 with polyolefin as heat seal polymer Table 7 Recipe ingredient V1-0 V1-1 V1-2 V1-3 V1-4 Heat seal polymer Type Polyolefin Heat seal polymer parts 100 100 100 100 100 100 100 100 kaolin parts 0 25 25 25 25 25 25 25 Copolymer wax parts 0 20 20 20 20 20 Amide wax parts 0 20 0 0 0 PE wax parts 0 0 20 0 PP wax parts 0 0 0 20 0 Soy wax parts 0 0 0 0 20
  • Table 8 shows formulations V2-0, V2-1, V2-2, V23, and V2-4 with polyethylene acrylate as heat seal polymer Table 8 Recipe ingredient V2-0 V2-1 V2-2 V2-3 V2-4 Heat seal polymer Type Polyethylene acrylate Heat seal polymer parts 100 100 100 100 100 100 100 100 100 100 100 100 kaolin parts 0 25 25 25 25 25 25 25 Copolymer wax parts 0 20 20 20 20 20 Amide wax parts 0 20 0 0 0 PE wax parts 0 0 20 0 0 PP wax parts 0 0 0 20 0 Soy wax parts 0 0 0 0 20
  • Table 9 shows formulations V3-0, V3-1, V3-2, and V3-3 with polyethylene vinyl acetate as the heat-seal polymer. Since neither copolymer wax nor soy wax is compatible with polyethylene vinyl acetate, the proportions of the other waxes were increased compared to the previous formulations.
  • Recipe ingredient V3-0 V3-1 V3-2 V3-3 Heat seal polymer Type Polyolethylenevinyl acetate Heat seal polymer parts 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 kaolin parts 0 25 25 25 25 25 Copolymer wax parts 0 0 0 0 0 Amide wax parts 0 25 0 0 PE wax parts 0 0 25 0 PP wax parts 0 0 0 25 Soy wax parts - - - - -
  • the application weights were adjusted so that the laboratory sheets without wax and pigments had the same application weight of heat-sealable polymer as the laboratory sheets with wax and pigments. Therefore, the laboratory sheets with wax and pigments had a higher overall application weight.
  • the slip force of the coated side of a laboratory sheet on a hot plate is determined.
  • the laboratory sheet is placed with the coated side on the hot plate.
  • a 1 kg weight measuring 5 cm x 5 cm x 5 cm is placed on top of the laboratory sheet, exerting a pressure of 0.4 N/ cm2 on the laboratory sheet.
  • a spring force gauge is then attached to the laboratory sheet with an adhesive strip.
  • the laboratory sheet is then manually pulled across the 60°C hot plate at a constant speed (0.3 m/min) using the spring force gauge.
  • the slip force can therefore can be determined directly on the spring force gauge. The higher the measured force, the stickier the paper surface.
  • smoothness was determined using the Bekk smoothness test.
  • the smoothness of the coated side of the laboratory sheets was measured using a smoothness meter.
  • the heat-sealability property was also determined using a test developed by the applicant, in which the laboratory sheets are sealed using a hand-held welding device.
  • the heat-sealing strength of the seal seam was determined using a strength tester, in which the force required to pull the paper strips apart at the seal seam was determined using a strength testing device.
  • the seal seam on the laboratory sheets was created using a hand-held welding device from Kopp SZ IG, in which the laboratory sheets were welded from coated side to coated side by manually pressing the welding tongs together at 135°C for 5 seconds.
  • the heat-sealing strength was then determined using an FPG 7/18 strength testing device from Kögel. The paper strips were clamped into the tensile testing device, and the force required to pull the paper strips apart at their seal seam was measured.
  • Tables 10, 11, and 12 The results of the laboratory tests are shown in Tables 10, 11, and 12 below.
  • the results of Table 10 correspond to the formulations shown in Table 7, the results of Table 11 correspond to the formulations shown in Table 8, and the results of Table 12 correspond to the formulations shown in Table 9.
  • Table 10 V1-0 V1-1 V1-2 V1-3 V1-4 Heat seal polymer Type Polyolefin Line application g/m 2 6 8 8 8 8 Smoothness according to Bekk s 35 ⁇ 10 20 ⁇ 10 20 ⁇ 5 20 ⁇ 5 25 ⁇ 10 Sensory stickiness note 8 2 3 3 3 3 Adhesive strength test N 8 3 5 5 5 5 Heat sealing strength N/15mm 3.1 2.8 2.8 3.0 3.0 V2-0 V2-1 V2-2 V2-3 V2-4 Heat seal polymer Type Polyethylene acrylate Line application g/m 2 4 6 6 6 6 Smoothness according to Bekk s 30 ⁇ 5 15 ⁇ 5 20 ⁇ 5 15 ⁇ 5 20 ⁇ 5 Sensory stickiness note 6 2 3 3 2 Adhesive strength test N 6 3 4
  • the applied heat-sealable polymers showed a sticky surface without the addition of wax/pigments, which, as expected, leads to problems during dosing in a paper machine with integrated film press and subsequent contact drying on hot cylinders.
  • tackiness test showed a significant decrease in tackiness, from 6-10 without wax/without pigments to 2-3 with wax/with pigments.
  • adhesion test showed a decrease in tackiness due to a reduction in slip force to values of 3-5 N compared to values of 6-12 N without wax/without pigments.
  • soy wax is considered an exception. Due to its low melting point on the hot drying cylinder, it is not possible to avoid deposits in combination with the heat-sealable polymers. Therefore, the semi-synthetic and synthetic waxes of the invention are considered more suitable for preventing deposits and clogging of the paper roll.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)

Claims (15)

  1. Procédé pour la fabrication d'un papier thermoscellable selon lequel une couche de thermoscellage, à base d'un polymère thermoscellable, est appliquée sur une bande de papier et la bande de papier est enroulée après l'application de la couche de thermoscellage, dans lequel
    la couche de thermoscellage en phase dispersée contient de la cire d'un premier type de cire, caractérisé en ce que
    le point de fusion du premier type de cire est supérieur à la température de séchage maximale de la bande de papier à enrouler et compris entre 105 et 164 degrés Celsius, et
    la cire contient un deuxième type de cire dont le point de fusion est choisi entre la température de séchage maximale de la bande de papier à enrouler et le point de fusion du premier type de cire.
  2. Procédé selon la revendication 1, dans lequel le point de fusion du deuxième type de cire est choisi entre la température de fusion du polymère thermoscellable et le point de fusion du premier type de cire.
  3. Procédé selon l'une quelconque des revendications 1 ou 2, dans lequel le point de fusion du deuxième type de cire est choisi dans une plage de 86 à 164 degrés Celsius.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel, par rapport à 100 % en poids du polymère thermoscellable, les pourcentages en poids du premier type de cire sont choisis dans une plage de 2 % à 25 % en poids lors de la seule utilisation du premier type de cire, et dans la plage de 2 % à 15 % en poids lors de l'utilisation du premier et du deuxième type de cire.
  5. Procédé selon l'une quelconque des revendications 2 à 4, dans lequel le pourcentage en poids du deuxième type de cire par rapport à 100 % en poids du polymère est choisi dans la plage de 3 % à 10 %.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel une cire à base d'acide acrylique éthylénique ou de cires d'amide d'acide gras secondaire est choisie comme premier ou deuxième type de cire.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel la couche de thermoscellage contient par rapport à 100 % en poids du polymère thermoscellable en outre 5 % à 40 % en poids d'un pigment en forme de plaquette à base de kaolin.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel la couche de thermoscellage contient en outre 0,1 % à 1 % en poids de copolymère d'acrylate par rapport à 100 % en poids du polymère thermoscellable et/ou la couche de thermoscellage contient en outre 0,01 % à 0,2 % en volume d'alcools gras par rapport à 100 % en poids du polymère thermoscellable.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel le polymère thermoscellable est constitué au moins de polyoléfine ou de polymères éthlylène polypropylène-acrylate, ou de polymères de polyéthylène.
  10. Procédé selon l'une quelconque des revendications précédentes, dans lequel une couche de face avant contient 20 à 80 % en poids d'un pigment en forme de plaquette à base de kaolin et 80 à 20 % en poids d'amidon modifié.
  11. Procédé selon l'une quelconque des revendications précédentes, dans lequel la température de séchage maximale de la bande de papier à enrouler est comprise entre 80 et 100 degrés Celsius.
  12. Procédé de fabrication d'un papier thermoscellable avec les étapes de procédé :
    • fabrication d'un papier brut dans une machine à papier avec une masse surfacique de 30 g/m2 à 150 g/m2 ;
    • application directe d'une couche de thermoscellage conformément à l'une quelconque des revendications 1 à 11 ;
    • séchage de la couche de thermoscellage
    • enroulement de la bande de papier.
  13. Composition de couchage thermoscellable à base d'un polymère thermoscellable, la composition de couchage thermoscellable contenant une cire qui comprend deux types de cire, dans laquelle le premier type de cire est présent en phase dispersée, a un point de fusion qui est supérieur à la température d'une bande de papier à enrouler dans une plage de 105 à 164 degrés Celsius, et dans laquelle le deuxième type de cire a un point de fusion compris entre la température de séchage maximale de la bande de papier à enrouler et le point de fusion du premier type de cire.
  14. Composition de couchage thermoscellable selon la revendication 13, dans laquelle la couche de thermoscellage contient en outre au moins l'un des composants suivants :
    • le deuxième type de cire, qui présente un point de fusion inférieur au premier type de cire, dans lequel le deuxième type de cire est basé sur des cires d'amide d'acide gras secondaire ;
    • 5 % à 40 % en poids d'un pigment en forme de plaquette à base de kaolin ;
    • 0,1 % à 1 % en volume de copolymère d'acrylate ;
    • 0,01 % à 0,2 % en volume d'alcools gras ;
    • le polymère thermoscellable qui est constitué au moins de polyoléfine ou de polymères de polypropylène éthylène-acrylate, ou de polymères de polyéthylène.
  15. Ensemble pour la fabrication d'une bande de papier thermoscellable comprenant :
    • une machine à papier pour la fabrication d'une bande de papier brut ;
    • un dispositif de couchage pour l'application d'une composition de couchage thermoscellable selon l'une quelconque des revendications 13 ou 14 ;
    • un dispositif de couchage pour l'application d'une composition de couchage mutuelle ;
    • un dispositif de séchage ;
    • un enrouleur pour enrouler la bande de papier.
EP21169546.5A 2021-04-21 2021-04-21 Procédé de fabrication d'un papier pouvant être scellé à chaud Active EP4079964B1 (fr)

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Publication number Priority date Publication date Assignee Title
CN116463889A (zh) * 2023-04-14 2023-07-21 厦门金汇峰新型包装材料股份有限公司 新型纸张包装卷膜及其制备方法
CN117801724B (zh) * 2024-01-09 2026-07-31 华威粘结材料（上海）股份有限公司 一种医疗包装用纸塑复合水性热熔胶及其制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196247A (en) * 1978-04-17 1980-04-01 American Can Company Packaging material having non-blocking coating
US5336528A (en) * 1993-01-15 1994-08-09 James River Paper Company, Inc. Heat sealable paper and method for its manufacture
GB0603254D0 (en) * 2006-02-17 2006-03-29 Dupont Teijin Films Us Ltd Polyester film
EP2077943B1 (fr) * 2006-11-01 2013-02-13 DuPont Teijin Films U.S. Limited Partnership Film de polyester composite scellable à chaud
CA2943782C (fr) * 2014-03-26 2022-05-17 Bostik, Inc. Revetement de thermoscellage basse temperature a base de solvant
BR112018002508B1 (pt) * 2015-08-06 2022-11-16 Actega North America, Inc Composição de revestimento em dispersão aquosa formadora de película com aplicação como revestimento por selagem térmica para aplicações em embalagens do tipo blister
EP3615730A4 (fr) * 2017-04-28 2021-01-27 Sun Chemical Corporation Revêtement barrière thermoscellable
WO2019043111A1 (fr) * 2017-08-31 2019-03-07 Topchim Nv Revêtement thermoscellable

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