WO2023286243A1 - 離型紙 - Google Patents

離型紙 Download PDF

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Publication number
WO2023286243A1
WO2023286243A1 PCT/JP2021/026622 JP2021026622W WO2023286243A1 WO 2023286243 A1 WO2023286243 A1 WO 2023286243A1 JP 2021026622 W JP2021026622 W JP 2021026622W WO 2023286243 A1 WO2023286243 A1 WO 2023286243A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
paper
base layer
shaping
release paper
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.)
Ceased
Application number
PCT/JP2021/026622
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
康男 鹿倉
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.)
Wr Supply
Wr Supply Inc
Original Assignee
Wr Supply
Wr Supply Inc
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.)
Filing date
Publication date
Application filed by Wr Supply, Wr Supply Inc filed Critical Wr Supply
Priority to JP2022506713A priority Critical patent/JP7076758B1/ja
Priority to PCT/JP2021/026622 priority patent/WO2023286243A1/ja
Priority to CN202180100517.6A priority patent/CN117677743A/zh
Publication of WO2023286243A1 publication Critical patent/WO2023286243A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

Definitions

  • the present invention relates to release paper.
  • release paper is used when manufacturing artificial leather (synthetic leather, artificial leather), which is an object to be shaped (see Patent Document 1).
  • polyurethane leather artificial leather
  • a base fabric fabric
  • removing the polyurethane resin layer and the base fabric from the release paper Manufactured to peel off.
  • Patent Document 1 since the release paper of Patent Document 1 is mainly composed of virgin pulp, a lot of deforestation was required during the production of the release paper. In addition, a large amount of carbon dioxide was emitted during its production.
  • an object of the present invention is to provide a release paper that can be manufactured with less deforestation and less carbon dioxide emissions.
  • the present invention provides a release paper for shaping an object to be shaped by releasing from the object, comprising: a used paper base layer containing used paper as a main component;
  • the release paper is characterized by comprising: a resin shaping layer formed on at least one surface of a base layer for shaping the object to be shaped.
  • waste paper refers to paper materials that have been distributed and used in the market once, and is a general term for waste paper collected in the market and industrial waste paper. Waste paper mainly means newspapers, magazines, paperboards (cardboards), and the like.
  • the object to be shaped includes artificial leather, building interior materials, etc., and artificial leather is a general term for synthetic leather and artificial leather.
  • the resin-made shaping layer for shaping the object to be shaped is not limited to a shaping layer having a shaping surface that is uneven for shaping unevenness as in the embodiments described later. It also includes a shaping layer having a flat shaping surface without irregularities for shaping a flat surface on the shape.
  • the waste paper base layer is mainly composed of waste paper, virgin pulp is unnecessary or very small in manufacturing release paper, and deforestation is basically unnecessary. That is, when the waste paper base layer is produced, no deforestation is required, and no heat treatment is required from the felled wood to the paper raw material pulp, so that no carbon dioxide is generated during the heat treatment.
  • waste paper can be easily disaggregated in water at room temperature without heating, energy for heating is not required, reducing carbon dioxide emissions, and no bleaching chemicals are used.
  • energy for heating is required, the amount of carbon dioxide emitted increases, and chemicals must be used for bleaching and the like.
  • the waste paper base layer can be easily recycled in the paperboard field, which was originally the main use of waste paper raw materials.
  • the base layer which is mainly composed of virgin pulp, is not easy to recycle in the printing paper industry, which uses virgin pulp as its main raw material, due to its whiteness and the possibility of foreign matter contamination. The entire amount is incinerated while generating a large amount of carbon dioxide.
  • the content of used paper in the used paper base layer may be 75 to 100%.
  • the content of waste paper is 75 to 100%, so the amount of carbon dioxide emissions can be further reduced to 50 to 33%, that is, to 1/2 to 1/3.
  • the amount of deforested forest can be reduced to 25 to 0%, ie, 1/4 or less of the release paper made of 100% virgin pulp.
  • release paper that can be manufactured with less deforestation and less carbon dioxide emissions.
  • FIG. 1 is a cross-sectional view of a release paper according to this embodiment
  • FIG. 4 is a graph showing the relationship between the used paper content ratio and the amount of carbon dioxide emissions in the used paper base layer according to the present embodiment.
  • 4 is a graph showing the relationship between basis weight, strength, curling property, and surface roughness in the used paper base layer according to the present embodiment.
  • the release paper 1 is used when manufacturing artificial leather (synthetic leather, artificial leather) or the like, which is an object to be shaped.
  • the release paper 1 shapes the artificial leather by releasing it from the artificial leather to be manufactured (used) when the artificial leather is manufactured.
  • Artificial leather or the like is obtained by coating or impregnating a fabric (substrate) such as a non-woven fabric with a resin.
  • a fabric such as a non-woven fabric with a resin.
  • Such artificial leather and the like are used, for example, as surface materials for sofas, chairs, vehicle seats, shoes, bags, clothing, packaging containers, etc., and as surface decorative materials for automobile parts such as dashboards and door panels.
  • the release paper 1 is used when forming a design (pattern) such as unevenness on the surface of interior materials for construction such as wallpaper and flooring.
  • polyurethane resin PU
  • thermoplastic polyurethane resin TPU
  • polyvinyl chloride resin PVC
  • the release paper 1 is a sheet (mold) that forms a designable shape on the resin layer to be shaped on the surface of the artificial leather by releasing it from the artificial leather or the like to be manufactured, and is also called a process paper. be done.
  • the release paper 1 has a two-layer structure, and includes a used paper base layer 10 as a base and a resin shaping layer 20 formed on an upper surface 11 (one surface) of the used paper base layer 10 .
  • the release paper 1 is not limited to a two-layer structure, and may have a structure of three or more layers.
  • the waste paper base layer 10 is a layer that serves as a support for the release paper 1, and is a layer containing waste paper as a main component. That is, the used paper base layer 10 is made by using used paper as a raw material. Waste paper includes, for example, newspapers, magazines, paperboard (corrugated cardboard), and the like.
  • Waste paper base layer 10 may have a single-layer structure in which waste paper is deposited in a single layer, or may have a multilayer structure in which waste paper is deposited in multiple layers.
  • the multi-layered waste paper base layer 10 is produced, for example, by making waste paper step by step. In the case of a multi-layered structure, when virgin pulp is contained in the balance, the smoothness of the used paper base layer 10 is enhanced by making the virgin pulp on the upper surface 11 side (surface side).
  • the content of used paper in the used paper base layer 10 is preferably 75 to 100%. As shown in FIG. 2, as the content of used paper increases, the amount of carbon dioxide emitted during the production of the used paper base layer 10 decreases linearly. Note that in FIG. 2, the amount of carbon dioxide emissions associated with the production of a base with a waste paper content of 0%, that is, a base with 100% virgin pulp is assumed to be 100%. In particular, when the used paper content is 75 to 100%, the amount of carbon dioxide emissions is reduced to 50 to 33%, that is, to 1/2 to 1/3. In addition, since the content of waste paper is 75 to 100%, the amount of deforested forest can be reduced to 25 to 0%, ie, 1/4 or less of the release paper made of 100% virgin pulp. The remainder is, for example, virgin pulp.
  • the basis weight (basis weight) of the waste paper in the waste paper base layer 10 is preferably 100 to 210 g/m 2 (preferably 120 to 170 g/m 2 ). This is because when it is 100 to 210 g/m 2 , smoothness and strength (compressive strength, tensile strength) as a support for the release paper 1 can be ensured.
  • the basis weight increases, the strength of the used paper base layer 10 increases, and the density of the used paper base layer 10 increases, so the surface roughness Ra of the upper surface 11 decreases, and the upper surface 11 becomes smooth and smooth. becomes higher.
  • the smoothness of the upper surface 11 is increased, the resin forming the shaping layer 20 is less likely to penetrate into the used paper base layer 10, and the smoothness of the upper surface 21 of the shaping layer 20 is increased.
  • the compressive strength (JIS P 8126:2015) of the waste paper base layer 10 is preferably 100-260N.
  • the burst strength (JIS P 8131:2009) of the used paper base layer 10 is preferably 180 to 400 kPa. This is because if the compression strength and bursting strength of the used paper base layer 10 are within this range, the used paper base layer 10 can ensure strength as a support for the release paper 1 .
  • the relationship between the basis weight, strength, curling property, and surface roughness (smoothness) in the used paper base layer 10 will be described.
  • the curling property of the used paper base layer 10 is difficult to handle, and when the curling property increases, the release paper 1 tends to curl strongly due to changes in temperature and humidity, for example.
  • both ends of the release paper 1 in the width direction curl in the process of uniformly applying the resin for forming the artificial leather to the entire surface of the release paper 1, and the slit die and the release paper for leveling the resin are used. 1 becomes narrower at both ends in the width direction, making it extremely difficult or impossible to even out the resin.
  • Compressive strength and bursting strength tend to increase linearly as the basis weight increases. Further, as the basis weight increases, the curling property (difficulty in handling) tends to increase gently and then increase steeply. Further, as the basis weight increases, the surface roughness tends to decrease steeply and then gradually decrease to approach a substantially constant value.
  • a suitable range of basis weight (100 to 210 g/m 2 ) is set (see arrows A1 and A2).
  • the optimum lower limit of the basis weight is set based on the surface roughness Ra (see arrow A3), and the optimum upper limit of the basis weight is set based on the curl property (see arrow A4).
  • the shaping layer 20 is a resin layer made of resin that shapes a design on the surface of the artificial leather.
  • the shaping layer 20 is also a release layer for facilitating the release of the artificial leather from the release paper 1 . That is, a design (pattern, gloss, touch feeling) is formed on the surface of the artificial leather (surface to be shaped) corresponding to the upper surface 21 (releasing surface) of the shaping layer 20 .
  • the shaping layer 20 is made of, for example, polyolefin-based resin, methylpentene-based resin, acrylic-based resin, silicon-based resin, photo-curable resin, alkyd-based resin, or melamine-based resin. These are used singly or in combination.
  • the polyolefin resin is a resin that enhances the smoothness of the upper surface 21 of the shaping layer 20, and is, for example, (low density) polyethylene, (low density) polypropylene, or polymethylpentene.
  • Methylpentene-based resins and acrylic-based resins are resins that improve the smoothness and heat resistance of the shaping layer 20 .
  • the silicon-based resin is a resin that enhances the releasability between the shaping layer 20 and the shaping layer of the artificial leather.
  • the photocurable resin is a resin that cures when irradiated with ultraviolet rays or electron beams, and this characteristic is used to form the unevenness 22 described later.
  • Alkyd-based resins and melamine-based resins are resins that enhance the glossiness and smoothness of the upper surface 21 of the shaping layer 20 .
  • Melamine-based resins are, for example, methylolmelamine resins and methoxymethylolmelamine resins.
  • the thickness of the shaping layer 20 is preferably 20-70 ⁇ m. This is because when the thickness is 20 to 70 ⁇ m, the shaping layer 20 can ensure the performance and quality of the release paper 1 as a shaping layer.
  • irregularities 22 are formed for shaping the design on the resin layer to be shaped of the artificial leather.
  • the unevenness 22 is not formed on the shaping layer 20, and the flatness of the upper surface 21 (release surface) of the shaping layer 20 is Increased.
  • the waste paper base layer 10 is formed by dispersing waste paper (newspaper, magazine, paperboard (corrugated cardboard), etc.) in water and stirring to form a slurry. Next, this slurry is paper-made to produce the used paper base layer 10 (release paper base paper).
  • a mixed resin of homopolypropylene, low-density polypropylene, and low-density polyethylene (LDPE) is applied to the upper surface 11 of the waste paper base layer 10 to form the shaping layer 20 .
  • LDPE low-density polyethylene
  • the upper surface 21 of the shaping layer 20 is embossed with an appropriate mold to form the unevenness 22 .
  • the waste paper base layer 10 is mainly composed of waste paper, virgin pulp is not required when manufacturing the release paper 1, and carbon dioxide is not generated due to deforestation. Furthermore, when the release paper 1 is manufactured, the amount of chemicals and energy used is reduced compared to the release paper made from virgin pulp, and the amount of carbon dioxide emissions is reduced. In particular, when the content of used paper in the used paper base layer 10 is 75 to 100%, the amount of carbon dioxide emitted during the production of the release paper 1 is approximately 50 to 33% compared to the release paper made from virgin pulp. %, that is, 1/2 to 1/3. In addition, since the content of waste paper is 75 to 100%, the amount of felled forest can be reduced to 25 to 0%, ie, 1/4 or less of the release paper made of 100% virgin pulp.
  • the configuration in which the shaping layer 20 is formed on the waste paper base layer 10 is exemplified, but in addition, for example, between the waste paper base layer 10 and the shaping layer 20, A configuration in which an adhesive layer that enhances the adhesiveness of the shaping layer 20 is formed may be employed.
  • a smooth layer may be formed between the used paper base layer 10 and the shaping layer 20 to increase the smoothness of the upper surface 11 of the used paper base layer 10 .
  • the smooth layer can be formed, for example, by applying a resin or a liquid obtained by dispersing an inorganic filler or the like in a resin, followed by drying.
  • a clay coat layer can also be used as the smooth layer.
  • the configuration in which the shaping layer 20 is formed only on the upper surface 11 of the used paper base layer 10 is exemplified.
  • a configuration in which the shaping layers 20 are respectively formed may be employed.
  • the shaping layer 20 on the upper surface 11 side and the shaping layer 20 on the lower surface 12 side are alternately used. Therefore, the durability of the release liner 1 is improved, and the usable time of the release liner 1 is extended. Further, since the shaping layer 20 is formed on each of the upper surface 11 and the lower surface 12 and the layer structure is symmetrical in the thickness direction, the release paper 1 is less likely to curl in the width direction.

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  • Laminated Bodies (AREA)
  • Paper (AREA)
PCT/JP2021/026622 2021-07-15 2021-07-15 離型紙 Ceased WO2023286243A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2022506713A JP7076758B1 (ja) 2021-07-15 2021-07-15 離型紙
PCT/JP2021/026622 WO2023286243A1 (ja) 2021-07-15 2021-07-15 離型紙
CN202180100517.6A CN117677743A (zh) 2021-07-15 2021-07-15 脱模纸

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/026622 WO2023286243A1 (ja) 2021-07-15 2021-07-15 離型紙

Publications (1)

Publication Number Publication Date
WO2023286243A1 true WO2023286243A1 (ja) 2023-01-19

Family

ID=81801984

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/026622 Ceased WO2023286243A1 (ja) 2021-07-15 2021-07-15 離型紙

Country Status (3)

Country Link
JP (1) JP7076758B1 (https=)
CN (1) CN117677743A (https=)
WO (1) WO2023286243A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269939A (ja) * 1992-03-25 1993-10-19 Mitsubishi Paper Mills Ltd 型付け用離型材
JP2001293817A (ja) * 2000-04-11 2001-10-23 Dainippon Printing Co Ltd 工程剥離紙
JP2008291408A (ja) * 2007-05-28 2008-12-04 Kishu Paper Co Ltd 工程剥離紙用原紙

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269936A (ja) * 1992-03-25 1993-10-19 Mitsubishi Paper Mills Ltd 型付け用離型材
JPH06202370A (ja) * 1992-11-01 1994-07-22 Fuji Xerox Co Ltd 電子写真用転写用紙
JP5638824B2 (ja) * 2010-03-31 2014-12-10 日本製紙株式会社 離型紙用原紙およびそれを用いた離型紙
JP6454282B2 (ja) * 2013-10-11 2019-01-16 リンテック株式会社 工程シート
CN111907247A (zh) * 2017-04-18 2020-11-10 王子控股株式会社 热转印纸用原纸和热转印纸

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269939A (ja) * 1992-03-25 1993-10-19 Mitsubishi Paper Mills Ltd 型付け用離型材
JP2001293817A (ja) * 2000-04-11 2001-10-23 Dainippon Printing Co Ltd 工程剥離紙
JP2008291408A (ja) * 2007-05-28 2008-12-04 Kishu Paper Co Ltd 工程剥離紙用原紙

Also Published As

Publication number Publication date
JPWO2023286243A1 (https=) 2023-01-19
CN117677743A (zh) 2024-03-08
JP7076758B1 (ja) 2022-05-30

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