JP2023042254A - Packaging paper - Google Patents
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- JP2023042254A JP2023042254A JP2021149461A JP2021149461A JP2023042254A JP 2023042254 A JP2023042254 A JP 2023042254A JP 2021149461 A JP2021149461 A JP 2021149461A JP 2021149461 A JP2021149461 A JP 2021149461A JP 2023042254 A JP2023042254 A JP 2023042254A
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 27
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims abstract description 28
- 239000005033 polyvinylidene chloride Substances 0.000 claims abstract description 28
- 229920000642 polymer Polymers 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims description 41
- 238000000576 coating method Methods 0.000 claims description 41
- 239000000758 substrate Substances 0.000 claims description 22
- 239000000839 emulsion Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000013502 plastic waste Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 5
- 239000000123 paper Substances 0.000 description 104
- 239000010410 layer Substances 0.000 description 65
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 24
- 239000000049 pigment Substances 0.000 description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 239000011247 coating layer Substances 0.000 description 18
- 229920003023 plastic Polymers 0.000 description 17
- 239000004033 plastic Substances 0.000 description 17
- -1 polyethylene terephthalate Polymers 0.000 description 15
- 229910000019 calcium carbonate Inorganic materials 0.000 description 12
- 229920001131 Pulp (paper) Polymers 0.000 description 10
- 229920001155 polypropylene Polymers 0.000 description 10
- 239000004743 Polypropylene Substances 0.000 description 9
- 229920002472 Starch Polymers 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 238000001035 drying Methods 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- 235000019698 starch Nutrition 0.000 description 9
- 239000008107 starch Substances 0.000 description 8
- 239000004927 clay Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 239000005995 Aluminium silicate Substances 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 235000012211 aluminium silicate Nutrition 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 240000008415 Lactuca sativa Species 0.000 description 5
- 229910052570 clay Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002655 kraft paper Substances 0.000 description 5
- 235000012045 salad Nutrition 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000011121 hardwood Substances 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 239000001254 oxidized starch Substances 0.000 description 3
- 235000013808 oxidized starch Nutrition 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000454 talc Substances 0.000 description 3
- 229910052623 talc Inorganic materials 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 3
- 239000012855 volatile organic compound Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 229920000704 biodegradable plastic Polymers 0.000 description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 229920006319 cationized starch Polymers 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000011115 styrene butadiene Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 1
- 241000609240 Ambelania acida Species 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 108010076119 Caseins Proteins 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- 240000000797 Hibiscus cannabinus Species 0.000 description 1
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920000426 Microplastic Polymers 0.000 description 1
- 229920003355 Novatec® Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- FMRLDPWIRHBCCC-UHFFFAOYSA-L Zinc carbonate Chemical compound [Zn+2].[O-]C([O-])=O FMRLDPWIRHBCCC-UHFFFAOYSA-L 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004067 bulking agent Substances 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000006081 fluorescent whitening agent Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- RLAWWYSOJDYHDC-BZSNNMDCSA-N lisinopril Chemical compound C([C@H](N[C@@H](CCCCN)C(=O)N1[C@@H](CCC1)C(O)=O)C(O)=O)CC1=CC=CC=C1 RLAWWYSOJDYHDC-BZSNNMDCSA-N 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Landscapes
- Paper (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
Abstract
Description
本発明は、包装用紙、特に、電子レンジ用の包装用紙に関する。 TECHNICAL FIELD The present invention relates to wrapping paper, particularly wrapping paper for microwave ovens.
近年、プラスチックゴミ問題が深刻化している。世界のプラスチックの生産量は４億トン／年を超えると言われ、その中でも包装容器セクターでのプラスチック生産量が多く、プラスチックゴミの大きな原因の一つになっている。プラスチックは半永久的に分解せず、そのゴミは自然環境下でマイクロプラスチック化し、生態系に深刻な悪影響を与えている。包装容器に使用されるプラスチックとしては、飲料のボトル等に使用されるポリエチレンテレフタレート（ＰＥＴ）、レジ袋、容器のラミネートに使用されるポリエチレン（ＰＥ）やポリプロピレン（ＰＰ）が最も多く使用されている。特にプラスチックゴミよる海洋の汚染は著しく、そのプラスチックゴミは回収不可能と言われている。今後、プラスチックの使用を低減することが地球環境にとって必要である。 In recent years, the problem of plastic waste has become more serious. The world's production of plastics is said to exceed 400 million tons/year, and among them, the production of plastics in the packaging and container sector is large, and it is one of the major causes of plastic waste. Plastic does not decompose semi-permanently, and its garbage turns into microplastics in the natural environment, which has a serious adverse effect on the ecosystem. The most commonly used plastics for packaging containers are polyethylene terephthalate (PET), which is used for beverage bottles, etc., and polyethylene (PE) and polypropylene (PP), which are used for laminating plastic bags and containers. . In particular, marine pollution caused by plastic waste is remarkable, and it is said that the plastic waste cannot be collected. In the future, it is necessary for the global environment to reduce the use of plastics.
一方で、プラスチックゴミ対策として微生物によって完全に分解され得る生分解性プラスチックの応用が世界中で提案されている。生分解プラスチックは自然界で一定期間の内に分解されるが、分解されるまではやはりゴミであり、それらの使用量及び廃棄量が低減されない限りにおいては、即効性のある対策とは言えない（特許文献１、２参照）。 On the other hand, the application of biodegradable plastics that can be completely decomposed by microorganisms has been proposed all over the world as a countermeasure against plastic waste. Biodegradable plastics decompose in the natural world within a certain period of time, but they are still garbage until they are decomposed. See Patent Documents 1 and 2).
即効性のある対策手段として、プラスチックを紙に代替することが提案されている。しなしながら、紙を袋や容器に加工する際には、バリア層として、ポリエチレンやポリプロピレンなどのプラスチックが多量にラミネートされて使用される。これらプラスチックのラミネート量は、商品コンセプトによって様々だが、概ね２０～５０ｇ／ｍ２であり、３００ｇ／ｍ２と多量になる場合もある。従って、プラスチックを紙に代替した包装容器においても、依然としてプラスチックの使用量は十分に低減されないという問題があり、早急に、直接的にプラスチックの使用を低減する手段が必要である。 Substitution of paper for plastic has been proposed as an immediate countermeasure. However, when processing paper into bags or containers, a large amount of plastic such as polyethylene or polypropylene is laminated and used as a barrier layer. The amount of these plastics to be laminated varies depending on the product concept, but is generally 20 to 50 g/m 2 , and may be as large as 300 g/m 2 . Therefore, even in packaging containers in which paper is substituted for plastic, there is still the problem that the amount of plastic used is not sufficiently reduced, and means for directly reducing the use of plastic is urgently needed.
更に、耐熱性の包装用紙、特に近年の電子レンジ用包装用紙においては、耐熱性を付与するためのポリプロピレン（ＰＰ）フィルムが多量にラミネートされており、ポイ捨て等により自然界に放出された場合にプラスチックゴミとなりやすい。また、プラスチックと紙の離解も実質的に不可能なために古紙としても回収不可能であり、ポイ捨てされやすい。 Furthermore, heat-resistant wrapping paper, especially microwave wrapping paper in recent years, is laminated with a large amount of polypropylene (PP) film to provide heat resistance. It tends to become garbage. In addition, since it is practically impossible to disaggregate plastic from paper, it cannot be recovered as used paper, and is likely to be thrown away.
上記従来技術の現状を鑑み、本発明の目的はプラスチックゴミを低減することができる包装用紙、特に耐熱性を有し、電子レンジに好適に使用でき、古紙として回収しやすい包装用紙を提供することにある。 In view of the current state of the prior art described above, an object of the present invention is to provide packaging paper that can reduce plastic waste, particularly packaging paper that has heat resistance, can be suitably used in microwave ovens, and is easy to collect as used paper. It is in.
本発明においては、従来の耐熱性プラスチックラミネート紙（以降、耐熱性ポリラミ紙と略称する場合がある）におけるポリプロピレンラミレートの使用量を低減するために、ポリ塩化ビニリデン系高分子を使用する。すなわち、本発明による包装用紙は、紙基材の少なくとも一方の面に少なくとも一層の耐熱層を有する包装用紙であって、前記耐熱層がポリ塩化ビニリデン系高分子（ＰＶＤＣと略称される場合もある）のみであり、前記耐熱層の密度が１．６～２．０ｇ／ｃｍ３であることを特徴とする。当該構成を有する本発明の包装用紙であれば、従来の耐熱性ポリラミ紙の耐熱層とほぼ同等の耐熱性を有することとなり、特に電子レンジ用の包装用紙に最適である。さらに、本発明の包装用紙はプラスチックと紙を離解しやすいので、古紙としても回収しやすい。 In the present invention, a polyvinylidene chloride polymer is used in order to reduce the amount of polypropylene laminate used in conventional heat-resistant plastic-laminated paper (hereinafter sometimes abbreviated as heat-resistant polylaminated paper). That is, the packaging paper according to the present invention is a packaging paper having at least one heat-resistant layer on at least one surface of a paper substrate, and the heat-resistant layer is sometimes abbreviated as polyvinylidene chloride polymer (PVDC). ), and the heat-resistant layer has a density of 1.6 to 2.0 g/cm 3 . The packaging paper of the present invention having such a structure has almost the same heat resistance as the heat-resistant layer of conventional heat-resistant poly-laminated paper, and is particularly suitable for packaging paper for microwave ovens. Furthermore, since the packaging paper of the present invention is easy to disaggregate plastic and paper, it is easy to collect as used paper.
本発明においては、前記耐熱層が少なくとも一方の面に２層以上で形成されていてもよい。このような構成とすることで、塗工層密度が高くなり、耐熱性に優れた包装用紙を得ることができる。 In the present invention, the heat-resistant layer may be formed of two or more layers on at least one surface. With such a configuration, the density of the coating layer is increased, and a wrapping paper having excellent heat resistance can be obtained.
また、本発明における包装用紙の製造方法は、ポリ塩化ビニリデン系高分子エマルジョンを含有する耐熱層用塗工液を調製する工程と、紙基材の少なくとも一方の面に、前記耐熱層用塗工液を２層以上塗工する工程とを有することが好ましい。特にポリ塩化ビニリデン系高分子エマルジョンとして、水系ポリ塩化ビニリデン系高分子エマルジョンを使用する事により、塗工量を比較的低くコントロールすることが可能であり、またＶＯＣ（揮発性有機化合物）排出が無いことから環境負荷の小さい包装用紙を得ることができる。 In addition, the method for producing a packaging paper according to the present invention comprises the steps of preparing a heat-resistant layer coating solution containing a polyvinylidene chloride-based polymer emulsion, and applying the heat-resistant layer coating solution to at least one surface of a paper substrate. and a step of applying two or more layers of the liquid. In particular, by using a water-based polyvinylidene chloride polymer emulsion as the polyvinylidene chloride polymer emulsion, it is possible to control the amount of coating to a relatively low level, and there is no VOC (volatile organic compound) emission. Therefore, it is possible to obtain packaging paper with a small environmental load.
本発明により、プラスチックゴミを低減できる耐熱性を有する包装用紙、特に電子レンジ用の包装用紙を製造することが可能である。本発明の包装用紙を用いた容器製品であれば、離解しやすい為に古紙として回収可能であり、プラスチックゴミ問題の解決の一助となる。なお、本発明における包装用紙は、例えば食品を入れて（のせて）電子レンジで温めることが可能な、袋、カートン、カップ、トレイ、箱、ケース、器等の包装容器全般に加工することができる。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to manufacture a heat-resistant wrapping paper, particularly a wrapping paper for microwave ovens, which can reduce plastic waste. Container products using the packaging paper of the present invention can be recovered as used paper because they are easily disaggregated, which helps solve the problem of plastic waste. In addition, the packaging paper in the present invention can be processed into general packaging containers such as bags, cartons, cups, trays, boxes, cases, vessels, etc., which can be heated in a microwave oven with (placed) food, for example. can.
次に、本発明について実施形態を示して詳細に説明するが、本発明はこれらの記載に限定して解釈されない。本発明の効果を奏する限り、実施形態は種々の変形をしてもよい。 Next, the present invention will be described in detail with reference to embodiments, but the present invention should not be construed as being limited to these descriptions. Various modifications may be made to the embodiments as long as the effects of the present invention are achieved.
本発明は、紙基材の少なくとも一方の面に少なくとも１層の耐熱層を有する包装用紙に関し、当該耐熱層がポリ塩化ビニリデン系重合体のみからなる。本実施形態において、ポリ塩化ビニリデン系高分子とは、塩化ビニリデン単量体を主体として多種のビニル化合物（アクリロニトリル、塩化ビニル、酢酸ビニル、アクリル酸エステル、アリルエステル、スチレン等）の１種以上との共重合物高分子である。本発明においては、耐熱層を形成するために前記ポリ塩化ビニリデン系高分子のエマルジョンのみを紙に塗工する。この他の樹脂が耐熱層に存在する場合は、ポリ塩化ビニリデン系高分子以外の樹脂が溶融し、更にポリ塩化ビニリデン高分子の結晶化が阻害されてしまい、耐電子レンジ性が劣ってしまう。更に耐熱層に顔料（例えば、軽質炭酸カルシウム、重質炭酸カルシウム、タルク、クレー、カオリンクレー、焼成クレー、二酸化チタン、水酸化アルミニウム）を添加すると、ポリ塩化ビニリデン系高分子の結晶化を阻害し、耐熱層塗工層密度が低下する。自然環境への負荷を小さくするために、前記エマルジョンは水系エマルジョンであることが好ましい。本発明の耐熱層を有する包装用紙であれば、従来のポリプロピレンフィルムを主体とする耐熱層と同等の耐熱性を得ることが可能となり、電子レンジ加熱時の熱に対しても融解することなく実用的に使用することができる。 TECHNICAL FIELD The present invention relates to a packaging paper having at least one heat-resistant layer on at least one surface of a paper base material, and the heat-resistant layer is composed only of a polyvinylidene chloride polymer. In the present embodiment, the polyvinylidene chloride-based polymer means one or more of various vinyl compounds (acrylonitrile, vinyl chloride, vinyl acetate, acrylic acid ester, allyl ester, styrene, etc.) mainly composed of vinylidene chloride monomer. is a copolymer polymer of In the present invention, only the polyvinylidene chloride polymer emulsion is coated on paper to form a heat-resistant layer. If other resins are present in the heat-resistant layer, the resins other than the polyvinylidene chloride-based polymer will melt, further inhibiting the crystallization of the polyvinylidene chloride-based polymer, resulting in poor microwave resistance. Addition of pigments (e.g., light calcium carbonate, heavy calcium carbonate, talc, clay, kaolin clay, calcined clay, titanium dioxide, aluminum hydroxide) to the heat-resistant layer inhibits the crystallization of the polyvinylidene chloride polymer. , the heat-resistant layer coating layer density decreases. In order to reduce the load on the natural environment, the emulsion is preferably an aqueous emulsion. With the packaging paper having the heat-resistant layer of the present invention, it is possible to obtain heat resistance equivalent to that of the heat-resistant layer mainly composed of conventional polypropylene film, and practical use without melting even when heated in a microwave oven. can be used as intended.
本実施形態においては、紙基材の少なくとも一方の面に、ポリ塩化ビニリデン系高分子エマルジョンを含有する耐熱層用塗工液を塗工し、乾燥することで耐熱層を設けることができる。ポリ塩化ビニリデン系高分子エマルジョンを用いることにより、塗工量を比較的低くコントロールすることが可能となる。更に、水系のポリ塩化ビニリデン系高分子エマルジョンを用いることによりＶＯＣ排出が無くなり自然環境に対する負荷を小さくすることができる。耐熱層の塗工量は、紙基材の片面あたり、固形分換算で３～３０ｇ／ｍ２であり、好ましくは４～２５ｇ／ｍ２である。３ｇ／ｍ２未満の場合は、ポリ塩化ビニリデン系エマルジョンが紙層に吸われて塗工層の密度が低下し、十分な耐熱性が得られない場合がある。逆に３０ｇ／ｍ２を超える場合は、耐熱性の面からは過剰品質であり、かつプラスチック削減効果に乏しくなるし、紙とプラスチックの離解もしにくくなる。また、ポリ塩化ビニリデン系エマルジョンが水系の場合、水で希釈して濃度を下げすぎることも塗工層密度低下の原因となる。水系ポリ塩化ビニリデン系高分子エマルジョンの固形分濃度は１５～５０％が好ましい。更に、耐熱層塗工液が泡立つと塗工層密度低下の原因となるので、脱泡機を使用する、攪拌度合いを適切に設定する、塗工液配管出口にストレーナーを設置する、塗工液投入時にはタンク壁面に沿わせて行う、等の処置を講ずることが好ましい。 In the present embodiment, a heat-resistant layer can be provided by applying a heat-resistant layer coating liquid containing a polyvinylidene chloride-based polymer emulsion to at least one surface of a paper base material and drying it. By using the polyvinylidene chloride-based polymer emulsion, it becomes possible to control the coating amount to a relatively low level. Furthermore, by using a water-based polyvinylidene chloride-based polymer emulsion, VOC emissions are eliminated and the load on the natural environment can be reduced. The coating amount of the heat-resistant layer is 3 to 30 g/m 2 , preferably 4 to 25 g/m 2 in terms of solid content, per one side of the paper substrate. If it is less than 3 g/m 2 , the polyvinylidene chloride emulsion may be absorbed by the paper layer, lowering the density of the coating layer and failing to obtain sufficient heat resistance. Conversely, if it exceeds 30 g/m 2 , the quality is excessive in terms of heat resistance, the plastic reduction effect is poor, and the paper and plastic are difficult to defiber. Further, when the polyvinylidene chloride emulsion is water-based, diluting it with water to reduce the concentration too much also causes a decrease in the density of the coating layer. The solid content concentration of the aqueous polyvinylidene chloride polymer emulsion is preferably 15 to 50%. Furthermore, if the coating liquid for the heat-resistant layer foams, it will cause a decrease in the density of the coating layer. It is preferable to take measures such as making it run along the tank wall surface when charging.
耐熱層用塗工液を少なくとも一方の面に２層以上塗工することが好ましい。より耐熱層の密度を上げることが可能であり、耐電子レンジ性に優れる。本発明においては、前記耐熱層の密度が１．６～２．０ｇ／ｃｍ３であることが必要である。密度が１．６ｇ／ｃｍ３未満の場合は耐電子レンジ性が劣り、２．０ｇ／ｃｍ３を超える場合は加工時に耐熱層が割れやすくなる。 It is preferable to apply two or more layers of the heat-resistant layer coating solution on at least one surface. It is possible to increase the density of the heat-resistant layer and is excellent in microwave oven resistance. In the present invention, it is necessary that the density of the heat-resistant layer is 1.6 to 2.0 g/cm 3 . If the density is less than 1.6 g/cm 3 , the microwave oven resistance is poor, and if it exceeds 2.0 g/cm 3 , the heat-resistant layer tends to crack during processing.
耐熱層用塗工液を塗工する方式としては、特に限定するものではなく、一般に使用されている塗工装置が使用できる。例えばエアーナイフコーター、ブレードコーター、グラビアコーター、ロッドブレードコーター、ロールコーター、リバースロールコーター、バーコーター、カーテンコーター、ダイスロットコーター、チャンプレックスコーター、メータリングブレード式のサイズプレスコーター、ショートドウェルコーター、スプレーコーター、ゲートロールコーター、リップコーター等の公知の各種塗工装置を用いることができる。更に、耐熱層塗工液は塗工後に乾燥させることが一般的である。これにより耐熱層の密度を適切な範囲とすることができる。耐熱層の密度が１．６～２．０ｇ／ｃｍ３であれば、乾燥温度と乾燥時間は特に指定されないが、耐熱層の塗工量に依存する。上記のように耐熱層の塗工量が、紙基材の片面あたり固形分換算で３～３０ｇ／ｍ２である場合は、耐熱層塗工液塗工後の乾燥温度は１０５～２００℃が好ましい。また、乾燥時間は２秒～６０秒であるとよい。乾燥温度が１０５℃未満の場合は耐熱層の密度が低下し、乾燥温度が２００℃を超える場合は紙の水分が低下し、耐熱層が割れやすくなる。 The method of applying the heat-resistant layer coating liquid is not particularly limited, and a generally used coating apparatus can be used. Air knife coater, blade coater, gravure coater, rod blade coater, roll coater, reverse roll coater, bar coater, curtain coater, die slot coater, Champlex coater, metering blade type size press coater, short dwell coater, spray Various known coating devices such as a coater, gate roll coater and lip coater can be used. Furthermore, the heat-resistant layer coating solution is generally dried after coating. Thereby, the density of the heat-resistant layer can be set in an appropriate range. If the density of the heat-resistant layer is 1.6 to 2.0 g/cm 3 , the drying temperature and drying time are not particularly specified, but they depend on the coating weight of the heat-resistant layer. As described above, when the coating amount of the heat-resistant layer is 3 to 30 g/m 2 in terms of solid content per side of the paper substrate, the drying temperature after applying the heat-resistant layer coating liquid is 105 to 200 ° C. preferable. Also, the drying time is preferably 2 to 60 seconds. If the drying temperature is less than 105°C, the density of the heat-resistant layer will decrease, and if the drying temperature exceeds 200°C, the water content of the paper will decrease and the heat-resistant layer will easily crack.
本実施形態において用いる紙基材としては特に限定するものではなく、パルプを主成分とする公知の紙基材を用いることができる。紙基材の主成分となるパルプとしては、ＬＢＫＰ（広葉樹さらしクラフトパルプ）、ＮＢＫＰ（針葉樹さらしクラフトパルプ）などの化学パルプ、ＧＰ（砕木パルプ）、ＰＧＷ（加圧式砕木パルプ）、ＲＭＰ（リファイナーメカニカルパルプ）、ＴＭＰ（サーモメカニカルパルプ）、ＣＴＭＰ（ケミサーモメカニカルパルプ）、ＣＭＰ（ケミメカニカルパルプ）、ＣＧＰ（ケミグランドパルプ）などの機械パルプ、ＤＩＰ（脱インキパルプ）などの木材パルプ及びケナフ、バガス、竹、コットンなどの非木材パルプを用いることができる。これらは、単独で使用するか、又は任意の割合で混合して使用することが可能である。例えば、パルプとして、ＬＢＫＰ（広葉樹さらしクラフトパルプ）をパルプ中９０～１００質量部使用することができる。また、本発明の目的とする効果を損なわない範囲において、合成繊維を更に配合することができる。環境保全の観点から、ＥＣＦ（Ｅｌｅｍｅｎｔａｌ Ｃｈｌｏｒｉｎｅ Ｆｒｅｅ）パルプ、ＴＣＦ（Ｔｏｔａｌ Ｃｈｌｏｒｉｎｅ Ｆｒｅｅ）パルプ、古紙パルプ、植林木から得られるパルプが好ましい。また、例えば、適切なパルプの叩解度としては、カナダ標準ろ水度（フリーネス）（ＪＩＳ Ｐ ８１２１：１９９５「パルプのろ水度試験方法」）で、２００～７００ｍｌＣＳＦ、例えば、４５０～６２０ｍｌＣＳＦである。 The paper substrate used in the present embodiment is not particularly limited, and known paper substrates containing pulp as a main component can be used. Pulp, which is the main component of the paper base material, includes chemical pulp such as LBKP (bleached hardwood kraft pulp), NBKP (bleached softwood kraft pulp), GP (groundwood pulp), PGW (pressurized groundwood pulp), RMP (refiner mechanical pulp). pulp), TMP (thermomechanical pulp), CTMP (chemithermomechanical pulp), CMP (chemi-mechanical pulp), CGP (chemigrand pulp) and other mechanical pulps, DIP (deinked pulp) and other wood pulps, kenaf, and bagasse , bamboo, cotton, etc. can be used. These can be used alone or mixed in any ratio. For example, 90 to 100 parts by mass of LBKP (hardwood bleached kraft pulp) can be used as the pulp. In addition, synthetic fibers can be further blended within a range that does not impair the intended effects of the present invention. From the viewpoint of environmental conservation, ECF (Elemental Chlorine Free) pulp, TCF (Total Chlorine Free) pulp, waste paper pulp, and pulp obtained from planted trees are preferable. In addition, for example, an appropriate freeness of pulp is 200 to 700 ml CSF, for example, 450 to 620 ml CSF in Canadian standard freeness (JIS P 8121: 1995 "Pulp freeness test method"). .
紙基材としては填料を含有するものも使用できる。填料としては、軽質炭酸カルシウム、重質炭酸カルシウム、タルク、クレー、カオリン、焼成クレー、二酸化チタン、水酸化アルミニウムを例示できる。紙基材中の填料含有量は、パルプの乾燥質量１００質量部に対して、例えば、１～３０質量部である。例えば、パルプの乾燥質量１００質量部に対して、軽質炭酸カルシウムを１～１０質量部含むとよい。 Paper substrates containing fillers can also be used. Examples of fillers include light calcium carbonate, heavy calcium carbonate, talc, clay, kaolin, calcined clay, titanium dioxide, and aluminum hydroxide. The filler content in the paper substrate is, for example, 1 to 30 parts by weight with respect to 100 parts by weight of dry pulp. For example, 1 to 10 parts by mass of light calcium carbonate may be included with respect to 100 parts by mass of dry pulp.
また、紙基材には、パルプと填料に加えて、各種公知の製紙用添加剤が含まれていてもよい。製紙用添加剤としては、例えば、サイズ剤、湿潤紙力増強剤などの内添紙力増強剤、嵩高剤、歩留り向上剤、濾水性向上剤、着色染料、着色顔料、蛍光増白剤、蛍光消色剤、ピッチコントロール剤などがある。本発明においては、パルプの乾燥質量１００質量部に対して、例えば、カチオン化澱粉を０．１～０．５部、中性ロジンサイズ０．１～０．５部加えてもよい。また、澱粉、ポリビニルアルコール、ポリアクリルアミドなどの水溶性高分子が塗布されていてもよい。例えば、酸化澱粉を両面あたりの乾燥塗布量が１～５ｇ／ｍ２となるように塗布すればよい。 The paper substrate may also contain various known papermaking additives in addition to the pulp and filler. Examples of papermaking additives include sizing agents, internal strength agents such as wet strength agents, bulking agents, retention aids, drainage improvers, coloring dyes, coloring pigments, fluorescent whitening agents, fluorescent Decoloring agents, pitch control agents, etc. In the present invention, for example, 0.1 to 0.5 parts of cationic starch and 0.1 to 0.5 parts of neutral rosin size may be added to 100 parts by mass of dry pulp. Also, a water-soluble polymer such as starch, polyvinyl alcohol or polyacrylamide may be applied. For example, oxidized starch may be applied so that the dry coating amount per both surfaces is 1 to 5 g/m 2 .
紙基材の抄紙方法は、特に限定されるものではなく、長網抄紙機、長網多層抄紙機、円網抄紙機、円網多層抄紙機、長網円網コンビ多層抄紙機、ツインワイヤー抄紙機などの各種抄紙機で製造できる。また、本発明においては、紙基材としては単層抄きでも多層抄きでも、複数層の貼合品であってもよい。 The paper-making method for the paper substrate is not particularly limited, and includes a fourdrinier paper machine, a fourdrinier multi-layer paper machine, a cylinder paper machine, a fourdrinier multi-layer paper machine, a fourdrinier cylinder combi multi-layer paper machine, and a twin wire paper machine. It can be manufactured by various paper machines such as Further, in the present invention, the paper base material may be a single-layer paper, a multi-layer paper, or a laminate of multiple layers.
紙基材には、耐熱層以外の顔料塗工層が１層以上設けられていてもよく、例えば、顔料と接着剤を含有する顔料塗工層が設けられていても良い。顔料塗工層中の顔料としては、一般の印刷用塗工紙の塗工層に使用される公知の顔料を用いることができ、例えば、炭酸カルシウム（重質炭酸カルシウムや軽質炭酸カルシウム等）、カオリン（クレーを含む）、焼成クレー、タルク、炭酸マグネシウム、硫酸バリウム、硫酸カルシウム、二酸化チタン、酸化亜鉛、硫酸亜鉛、炭酸亜鉛、珪酸カルシウム、珪酸アルミニウム、珪酸マグネシウム、珪藻土、水酸化アルミニウム、水酸化マグネシウム等の無機顔料、又はアクリル、スチレン、塩化ビニル、ナイロンそのものや、これらを共重合して得られる有機顔料（いわゆるプラスチックピグメント）が挙げられる。例えば、顔料としては、２０～４０質量部のカオリンと６０～８０質量部の重質炭酸カルシウムの組み合わせを使用することができる。また、接着剤も一般の印刷用塗工紙の塗工層に使用される公知の接着剤を用いることができ、例えば、ブタジエン系共重合ラテックス、架橋剤変性澱粉、酸化澱粉、酵素変性澱粉、エステル化澱粉、エーテル化澱粉、カチオン性澱粉、両性澱粉などの澱粉類、ゼラチン、カゼイン、大豆タンパク、ポリビニルアルコール等の水溶性高分子、酢酸ビニル、エチレン酢酸ビニル、ポリウレタン系樹脂、アクリル系樹脂、ポリエステル系樹脂、ポリアミド系樹脂、等の合成樹脂類等を例示できる。顔料塗工層中の顔料と接着剤の配合割合は特に限定されるものではないが、顔料１００質量部に対し接着剤５～５０質量部とすることが好ましい。例えば、接着剤としては、顔料１００質量部に対して、１～５質量部のリン酸エステル化澱粉と５～１５質量部のスチレンブタジエンラテックスの組み合わせを使用することができる。顔料塗工層には、本発明の目的とする効果を損ねない範囲で各種助剤を含んでもよく、例えば、着色剤、粘度調節剤、柔軟剤、光沢付与剤、耐水化剤、分散剤、流動変性剤、紫外線吸収剤、安定化剤、帯電防止剤、架橋剤、サイズ剤、ｐＨ調節剤、消泡剤、可塑剤、防腐剤が含まれていてもよい。また、このような顔料塗工層の塗工量としては、例えば、紙基材の片面あたり、固形分換算で、２～４０ｇ／ｍ２である。本発明の包装用紙の実施形態の一つとして、耐熱層はこのような顔料塗工層の上に設けられてもよく、また、別の実施形態としては一方の面のみに顔料塗工層が設けられた紙基材の顔料塗工層が設けられていない面に耐熱層が設けられていてもよい。 The paper substrate may be provided with one or more pigment-coated layers other than the heat-resistant layer. For example, a pigment-coated layer containing a pigment and an adhesive may be provided. As the pigment in the pigment coating layer, known pigments used in the coating layer of general coated printing paper can be used. Examples include calcium carbonate (heavy calcium carbonate, light calcium carbonate, etc.), Kaolin (including clay), calcined clay, talc, magnesium carbonate, barium sulfate, calcium sulfate, titanium dioxide, zinc oxide, zinc sulfate, zinc carbonate, calcium silicate, aluminum silicate, magnesium silicate, diatomaceous earth, aluminum hydroxide, hydroxide Examples include inorganic pigments such as magnesium, acryl, styrene, vinyl chloride, nylon itself, and organic pigments obtained by copolymerizing these (so-called plastic pigments). For example, a combination of 20 to 40 parts by weight of kaolin and 60 to 80 parts by weight of ground calcium carbonate can be used as the pigment. As the adhesive, known adhesives used for the coating layer of general coated printing paper can be used. Starches such as esterified starch, etherified starch, cationic starch and amphoteric starch, water-soluble polymers such as gelatin, casein, soybean protein, polyvinyl alcohol, vinyl acetate, ethylene vinyl acetate, polyurethane resin, acrylic resin, Synthetic resins such as polyester-based resins and polyamide-based resins can be exemplified. The mixing ratio of the pigment and the adhesive in the pigment coating layer is not particularly limited, but it is preferable to use 5 to 50 parts by weight of the adhesive per 100 parts by weight of the pigment. For example, as an adhesive, a combination of 1 to 5 parts by weight of phosphate esterified starch and 5 to 15 parts by weight of styrene-butadiene latex can be used with respect to 100 parts by weight of pigment. The pigment coating layer may contain various auxiliary agents within a range that does not impair the intended effects of the present invention. Flow modifiers, UV absorbers, stabilizers, antistatic agents, cross-linking agents, sizing agents, pH modifiers, defoamers, plasticizers and preservatives may also be included. The coating amount of such a pigment coating layer is, for example, 2 to 40 g/m 2 in terms of solid content per side of the paper substrate. As one embodiment of the wrapping paper of the present invention, a heat-resistant layer may be provided on such a pigment coating layer, and as another embodiment, only one side has a pigment coating layer. A heat-resistant layer may be provided on the surface of the paper base on which the pigment coating layer is not provided.
本実施形態において、包装用紙の坪量は特に限定するものではないが、例えば１０～５００ｇ／ｍ２である。耐熱層の塗工及び加工適性を考慮すれば好ましくは２０～４００ｇ／ｍ２が好ましい。 In this embodiment, the basis weight of the wrapping paper is not particularly limited, but is, for example, 10 to 500 g/m 2 . Considering the coating and processability of the heat-resistant layer, it is preferably 20 to 400 g/m 2 .
次に、実施例を挙げて本発明をより具体的に説明するが、本発明はこれら実施例に限定されるものではない。また、例中の「部」、「％」は、特に断らない限りそれぞれ「質量部」、「質量％」を示す。なお、添加部数は、固形分換算の値である。 EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In addition, "parts" and "%" in the examples indicate "mass parts" and "mass%", respectively, unless otherwise specified. The number of parts to be added is a value in terms of solid content.
（実施例１）
（紙基材の作製）
カナディアンスタンダードフリーネス５５０ｍｌｃｓｆの広葉樹晒クラフトパルプ１００部、軽質炭酸カルシウム（商品名：ＴＰ－１２１、奥多摩工業社製）５部、カチオン化澱粉（商品名：ネオタック３０Ｔ、日本食品加工社製）０．３部、中性ロジンサイズ（商品名：ＣＣ１６７、星光ＰＭＣ社製）０．４部に水を加えて紙料を調製し、長網多筒式抄紙機を用いて坪量２４８ｇ／ｍ２の原紙を作製した。この原紙にゲートロールコーターによって、酸化澱粉（商品名：ＭＳ３８００、日本食品化工社製）を両面あたりの乾燥塗布量が２ｇ／ｍ２となるように塗布し、乾燥して２５０ｇ／ｍ２の紙基材を得た。
(Example 1)
(Preparation of paper substrate)
100 parts of bleached hardwood kraft pulp of Canadian standard freeness 550 mlcsf, 5 parts of light calcium carbonate (trade name: TP-121, manufactured by Okutama Kogyo Co., Ltd.), 0.3 parts of cationized starch (trade name: Neotac 30T, manufactured by Nihon Shokuhin Kako Co., Ltd.) Water was added to 0.4 part of neutral rosin size (trade name: CC167, manufactured by Seiko PMC) to prepare a paper stock, and a base paper having a basis weight of 248 g/m 2 was prepared using a fourdrinier multi-tube paper machine. was made. This base paper was coated with oxidized starch (trade name: MS3800 , manufactured by Nihon Shokuhin Kako Co., Ltd.) using a gate roll coater so that the dry coating amount per both sides was 2 g/m 2 . A substrate was obtained.
（顔料塗工層用塗工液の調製）
カオリン（商品名：コンツアー１５００、イメリス社製）２０部及び重質炭酸カルシウム（商品名：カービラックス、イメリス社製）８０部に分散剤（商品名：アロンＴ－５０、東亜合成社製）０．１部を加え、加水してコーレス分散機を用いて水分散し、顔料スラリーを作製した。この顔料スラリーに、バインダーとしてリン酸エステル化澱粉（商品名：ＭＳ４６００、日本食品加工社製）２部及びスチレンブタジエンラテックス（商品名：ＰＡ０３７２、日本エイアンドエル株式会社）８部、更に水を加えて分散させ、固形分濃度５０％の顔料塗工層用塗工液を調製した。
(Preparation of coating solution for pigment coating layer)
20 parts of kaolin (trade name: Contour 1500, manufactured by Imerys) and 80 parts of ground calcium carbonate (trade name: Carvirax, manufactured by Imerys), and a dispersant (trade name: Aron T-50, manufactured by Toa Gosei) 0.1 part was added, water was added, and water was dispersed using a Colles disperser to prepare a pigment slurry. To this pigment slurry, 2 parts of phosphate esterified starch (trade name: MS4600, manufactured by Nihon Shokuhin Kako Co., Ltd.) and 8 parts of styrene-butadiene latex (trade name: PA0372, Nippon A&L Co., Ltd.) are added as binders, and water is added to disperse. to prepare a coating liquid for a pigment coating layer having a solid content concentration of 50%.
（塗工紙の作製）
上記で得られた基紙の両面に、顔料塗工層用塗工液を、片面当たりの乾燥塗工量が１０ｇ／ｍ２になるようにブレードコーターを用いて塗工、乾燥した。その後、キャレンダー処理を行い、坪量が２７０ｇ／ｍ２の塗工紙を作製した。
(Preparation of coated paper)
Both sides of the base paper obtained above were coated with the pigment coating layer coating solution using a blade coater so that the dry coating amount per side was 10 g/m 2 , followed by drying. Thereafter, a calendering treatment was performed to prepare a coated paper having a basis weight of 270 g/m 2 .
（包装用紙の作製）
上記で得られた塗工紙の片面に、水系ポリ塩化ビニリデン系高分子エマルジョン（商品名：Ｌ５３６Ｂ、旭化成社製）を水で希釈して固形分濃度４５％にし、合計乾燥塗工量が１０ｇ／ｍ２になるようにエアーナイフコーターを用いて２回塗工し（２回塗工して合計塗工量が１０ｇ／ｍ２）、１３０℃で１５秒乾燥して耐熱層を設け、包装用紙を作製した。
(Preparation of wrapping paper)
On one side of the coated paper obtained above, a water-based polyvinylidene chloride-based polymer emulsion (trade name: L536B, manufactured by Asahi Kasei Corporation) was diluted with water to a solid content concentration of 45%, and the total dry coating weight was 10 g. /m 2 using an air knife coater (total coating amount of 10 g/m 2 after two coats), dried at 130°C for 15 seconds to form a heat-resistant layer, and packaged. A paper was made.
（実施例２）
実施例１において、耐熱層の塗工量を２０ｇ／ｍ２にした以外は実施例１と同様にして包装用紙を作製した。
(Example 2)
A wrapping paper was produced in the same manner as in Example 1, except that the coating weight of the heat-resistant layer was changed to 20 g/m 2 .
（実施例３）
実施例１において、耐熱層の塗工量を３ｇ／ｍ２に変更した以外は、実施例１と同様にして包装用紙を作製した。
(Example 3)
A wrapping paper was produced in the same manner as in Example 1, except that the coating weight of the heat-resistant layer was changed to 3 g/m 2 .
（実施例４）
実施例１において、耐熱層の塗工量を２５ｇ／ｍ２に変更した以外は、実施例１と同様にして包装用紙を作製した。
(Example 4)
A wrapping paper was produced in the same manner as in Example 1, except that the coating weight of the heat-resistant layer was changed to 25 g/m 2 .
（実施例５）
（紙基材の作製）
カナディアンスタンダードフリーネス５８０ｍｌｃｓｆの広葉樹晒クラフトパルプ１００部、軽質炭酸カルシウム（商品名：ＴＰ－１２１、奥多摩工業社製）５部、カチオン化澱粉（商品名：ネオタック３０Ｔ、日本食品加工社製）０．２部、中性ロジンサイズ（サイズパインＮＴ－７８：荒川化学工業社製）０．２部に水を加えて紙料を調製し、長網多筒式抄紙機を用いて坪量３８ｇ／ｍ２の原紙を作製した。この原紙にゲートロールコーターによって、酸化澱粉（商品名：ＭＳ３８００、日本食品化工社製）を両面あたりの乾燥塗布量が２ｇ／ｍ２となるように塗布し、乾燥して４０ｇ／ｍ２の紙基材を得た。
(Example 5)
(Preparation of paper substrate)
100 parts of bleached hardwood kraft pulp of Canadian standard freeness 580 mlcsf, 5 parts of light calcium carbonate (trade name: TP-121, manufactured by Okutama Kogyo Co., Ltd.), 0.2 parts of cationized starch (trade name: Neotac 30T, manufactured by Nihon Shokuhin Kako Co., Ltd.) Water is added to 0.2 part of neutral rosin size (Size Pine NT-78: manufactured by Arakawa Chemical Industries, Ltd.) to prepare a paper stock, and the basis weight is 38 g / m 2 using a fourdrinier multi-tube paper machine. A base paper was produced. This base paper was coated with oxidized starch (trade name: MS3800, manufactured by Nihon Shokuhin Kako Co., Ltd.) with a gate roll coater so that the dry coating amount per both sides was 2 g/m 2 , and dried to give a paper of 40 g/m 2 . A substrate was obtained.
（包装用紙の作製）
上記で得られた紙基材の片面に、水系ポリ塩化ビニリデン系高分子エマルジョン（商品名：Ｌ４１１Ａ、旭化成社製）を水で希釈して固形分濃度３０％にし、合計乾燥塗工量が１０ｇ／ｍ２になるようにエアーナイフコーターを用いて２回塗工し（２回塗工して合計塗工量が１０ｇ／ｍ２）、１１５℃で２５秒乾燥して耐熱層を設け、包装用紙を作製した。
(Preparation of wrapping paper)
On one side of the paper substrate obtained above, a water-based polyvinylidene chloride polymer emulsion (trade name: L411A, manufactured by Asahi Kasei Corporation) was diluted with water to a solid content concentration of 30%, and the total dry coating amount was 10 g. /m 2 using an air knife coater (total coating amount of 10 g/m 2 after two coats), dried at 115°C for 25 seconds to form a heat-resistant layer, and packaged. A paper was made.
（実施例６）
実施例５において、耐熱層の塗工量を２０ｇ／ｍ２にした以外は実施例５と同様にして包装用紙を作製した。
(Example 6)
A wrapping paper was prepared in the same manner as in Example 5, except that the coating weight of the heat-resistant layer was changed to 20 g/m 2 .
（実施例７）
実施例５において、耐熱層の塗工量を３ｇ／ｍ２に変更した以外は、実施例５と同様にして包装用紙を作製した。
(Example 7)
A wrapping paper was produced in the same manner as in Example 5, except that the coating weight of the heat-resistant layer was changed to 3 g/m 2 .
（実施例８）
実施例５において、耐熱層の塗工量を２５ｇ／ｍ２に変更した以外は、実施例５と同様にして包装用紙を作製した。
(Example 8)
A wrapping paper was produced in the same manner as in Example 5, except that the coating weight of the heat-resistant layer was changed to 25 g/m 2 .
（比較例１）
実施例５で作製した紙基材の片面に、エクストリュージョンコーター（溶融押出し機）にて低密度ポリエチレン（東ソー社製、ペトロセンＤＬＺ１９Ａ）を塗工量が３０ｇ／ｍ２になるようにラミネートして耐熱層を設け、包装用紙を作製した。
(Comparative example 1)
On one side of the paper substrate prepared in Example 5, low-density polyethylene (Petrothene DLZ19A manufactured by Tosoh Corporation) was laminated using an extrusion coater (melt extruder) so that the coating amount was 30 g/m 2 . A heat-resistant layer was provided on the substrate, and a wrapping paper was produced.
（比較例２）
実施例５で作製した紙基材の片面に、エクストリュージョンコーター（溶融押出し機）にてポリプロピレン（日本ポリプロ社製、ノバテックＦＬ０３Ｈ）を塗工量が３０ｇ／ｍ２になるようにラミネートして耐熱層を設け、包装用紙を作製した。
(Comparative example 2)
On one side of the paper substrate prepared in Example 5, polypropylene (Novatec FL03H manufactured by Japan Polypro Co., Ltd.) was laminated using an extrusion coater (melt extruder) so that the coating amount was 30 g/m 2 . A heat-resistant layer was provided and a wrapping paper was produced.
（比較例３）
実施例７において、水系ポリ塩化ビニリデン系高分子エマルジョンを水系アクリルエマルジョン（日新化学工業社製、ビニブラン２６８５）に変更した以外は実施例７と同様にして包装用紙を作製した。
(Comparative Example 3)
Packaging paper was produced in the same manner as in Example 7, except that the water-based polyvinylidene chloride polymer emulsion was changed to a water-based acrylic emulsion (Vinyblan 2685, manufactured by Nisshin Chemical Industry Co., Ltd.).
（比較例４）
耐熱層塗工液として、水系ポリ塩化ビニリデン系高分子エマルジョン（商品名：Ｌ４１１Ａ、旭化成社製）８０質量部、カオリン（商品名：コンツアー１５００、イメリス社製）２０部を水で希釈して固形分濃度２８％に変更した以外は実施例７と同様にして包装用紙を作製した。
(Comparative Example 4)
As a heat-resistant layer coating liquid, 80 parts by mass of a water-based polyvinylidene chloride polymer emulsion (trade name: L411A, manufactured by Asahi Kasei Corporation) and 20 parts of kaolin (trade name: Contour 1500, manufactured by Imerys) were diluted with water. A wrapping paper was produced in the same manner as in Example 7, except that the solid content concentration was changed to 28%.
（比較例５）
実施例７において、水系ポリ塩化ビニリデン系高分子エマルジョンを１回塗工にした以外は実施例７と同様にして包装用紙を作製した。
(Comparative Example 5)
A wrapping paper was prepared in the same manner as in Example 7, except that the water-based polyvinylidene chloride polymer emulsion was applied once.
（比較例６）
実施例７において、耐熱層を設ける際の乾燥温度を１０３℃とした以外は実施例７と同様にして包装用紙を作製した。
(Comparative Example 6)
A wrapping paper was produced in the same manner as in Example 7, except that the drying temperature in providing the heat-resistant layer was 103°C.
各実施例及び比較例で得られた包装用紙について、以下に示す方法により評価を行った。得られた結果を表１に示す。 The packaging paper obtained in each example and comparative example was evaluated by the methods shown below. Table 1 shows the results obtained.
（１）耐電子レンジ性
作成した包装用紙を１５ｃｍ四方に断裁し、耐熱層の上に市販サラダ油を１滴滴下し、市販電子レンジの中で５００Ｗ，３分間加熱した。加熱終了後にサンプルを取り出し、以下のように目視評価した。電子レンジで加熱する事で、耐熱層が融解して油が浸透する場合は耐電子レンジ性が劣る。
◎：サラダ油が全く浸み込んでおらず実用できる。
○：サラダ油がごくわずかに浸みこんでいるが実用できる。
△：サラダ油が浸み込んでおり実用できない。
×：サラダ油が完全に浸み込んで裏側まで浸透しており実用できない。
(1) Microwave Resistance The prepared wrapping paper was cut into 15 cm squares, one drop of commercially available salad oil was dropped on the heat-resistant layer, and heated in a commercially available microwave oven at 500 W for 3 minutes. After the heating was completed, the sample was taken out and visually evaluated as follows. If heating in a microwave oven melts the heat-resistant layer and allows oil to permeate, the microwave resistance is poor.
⊚: Practical with no permeation of salad oil.
Good: Salad oil is very slightly permeated, but practical.
Δ: Salad oil permeates and cannot be practically used.
x: Salad oil completely permeates and permeates to the back side, and cannot be practically used.
（２）塗工層密度
以下のように耐熱層密度を求めた。
密度（ｇ／ｃｍ３）＝塗工量（ｇ／ｍ２）／耐熱層厚み（μｍ）
耐熱層厚みは電子顕微鏡にて断面厚みを２０箇所測定した値の平均値を求めた。
(2) Coating Layer Density The heat-resistant layer density was determined as follows.
Density (g/cm 3 )=coating amount (g/m 2 )/heat-resistant layer thickness (μm)
The thickness of the heat-resistant layer was obtained by averaging 20 cross-sectional thicknesses measured with an electron microscope.
表１より明らかなように、実施例１～８による包装用紙（水系ポリ塩化ビニリデンエマルジョン塗工品）は比較例１、３、４、５、６と比較して、耐熱性に優れており、電子レンジ用途に適している。また、比較例２の従来ポリプロピレンラミネート品と比較して、耐熱性に関して同等レベルであった。以上のように、特定の密度を有するポリ塩化ビニリデンから成る耐熱層を有する本発明の包装用紙は、優れた耐熱性を示し、電子レンジ用途に適していることが明らかになった。 As is clear from Table 1, the packaging papers (water-based polyvinylidene chloride emulsion-coated products) according to Examples 1 to 8 are superior in heat resistance compared to Comparative Examples 1, 3, 4, 5, and 6. Suitable for microwave applications. Moreover, compared with the conventional polypropylene laminate product of Comparative Example 2, the heat resistance was at the same level. As described above, the packaging paper of the present invention, which has a heat-resistant layer made of polyvinylidene chloride with a specific density, exhibits excellent heat resistance and is suitable for use in microwave ovens.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021149461A JP2023042254A (en) | 2021-09-14 | 2021-09-14 | Packaging paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021149461A JP2023042254A (en) | 2021-09-14 | 2021-09-14 | Packaging paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2023042254A true JP2023042254A (en) | 2023-03-27 |
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ID=85717021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2021149461A Pending JP2023042254A (en) | 2021-09-14 | 2021-09-14 | Packaging paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2023042254A (en) |
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- 2021-09-14 JP JP2021149461A patent/JP2023042254A/en active Pending
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