JP4738154B2 - Cardboard liner - Google Patents
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- JP4738154B2 JP4738154B2 JP2005351527A JP2005351527A JP4738154B2 JP 4738154 B2 JP4738154 B2 JP 4738154B2 JP 2005351527 A JP2005351527 A JP 2005351527A JP 2005351527 A JP2005351527 A JP 2005351527A JP 4738154 B2 JP4738154 B2 JP 4738154B2
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- liner
- paper
- layer
- binder
- oil resistance
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- 239000011111 cardboard Substances 0.000 title description 27
- 239000000123 paper Substances 0.000 claims description 60
- 239000010410 layer Substances 0.000 claims description 57
- 239000003921 oil Substances 0.000 claims description 42
- 239000011230 binding agent Substances 0.000 claims description 25
- 239000000049 pigment Substances 0.000 claims description 23
- 239000002655 kraft paper Substances 0.000 claims description 17
- 239000011247 coating layer Substances 0.000 claims description 16
- 239000010954 inorganic particle Substances 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 16
- 239000011122 softwood Substances 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 7
- 241000628997 Flos Species 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 27
- 238000000576 coating method Methods 0.000 description 27
- 239000011248 coating agent Substances 0.000 description 26
- 239000010893 paper waste Substances 0.000 description 18
- 238000007639 printing Methods 0.000 description 16
- 239000002537 cosmetic Substances 0.000 description 13
- 229910000019 calcium carbonate Inorganic materials 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 238000002156 mixing Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- -1 polyethylene Polymers 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005336 cracking Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- 239000004927 clay Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 235000013305 food Nutrition 0.000 description 5
- 238000007646 gravure printing Methods 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 229910021532 Calcite Inorganic materials 0.000 description 4
- 241000238557 Decapoda Species 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
- 239000002939 oilproofing Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 235000013550 pizza Nutrition 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000002761 deinking Substances 0.000 description 3
- 235000012020 french fries Nutrition 0.000 description 3
- 239000011121 hardwood Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000012085 test solution Substances 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000005476 size effect Effects 0.000 description 2
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 206010027146 Melanoderma Diseases 0.000 description 1
- 235000002595 Solanum tuberosum Nutrition 0.000 description 1
- 244000061456 Solanum tuberosum Species 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000011088 parchment paper Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 235000012015 potatoes Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Landscapes
- Paper (AREA)
Description
本発明は、美粧性を有する耐油段ボールに好適に用いられる段ボール用ライナ（以下、「 ライナ」という）に関し、更に詳しくは冷凍・冷蔵用の段ボールケースに使用できる耐油機能を有し、かつ印刷が可能であり、古紙として回収しリサイクルが可能なライナに関するものである。 The present invention relates to a corrugated liner suitable for use in oil-resistant corrugated cardboard having a cosmetic property (hereinafter referred to as “liner”), and more specifically, has an oil-resistant function that can be used in a corrugated cardboard case for freezing and refrigeration, and printing It relates to a liner that can be recovered and recycled as waste paper.
例えば、冷凍えびや油分を含んだピザ、コロッケ、フライドポテト、天ぷら、シュウマイ、たこ焼きなどの種々の冷凍、冷蔵品や生鮮食品を梱包する段ボールケースにおいては、特に耐油性が要求されるため、一般にポリエチレンやポリプロピレン樹脂をラミネート加工したライナ、あるいはワックスを含浸させたライナが用いられていた。しかし、ポリエチレンやポリプロピレン樹脂をラミネート加工したライナは、古紙として回収しリサイクルすることが困難であり、環境の観点から問題がある。よって、上記の用途の梱包材料に、ポリエチレンをコートしたライナ並の耐油性を持たせ、古紙として回収しリサイクルが可能な耐油ライナの開発が望まれてきた。 For example, in a corrugated cardboard case that packs various frozen, refrigerated products and fresh foods such as pizza, croquettes, french fries, tempura, shumai, takoyaki containing frozen shrimp and oil, oil resistance is generally required. A liner laminated with polyethylene or polypropylene resin or a liner impregnated with wax has been used. However, a liner obtained by laminating polyethylene or polypropylene resin is difficult to collect and recycle as waste paper, which is problematic from an environmental point of view. Therefore, it has been desired to develop an oil-resistant liner that can be collected and recycled as used paper by giving the packaging material for the above uses the same oil resistance as a liner coated with polyethylene.
尚、ポリエチレンやポリプロピレン樹脂をラミネート加工したライナが、リサイクルされない他の原因としては、これらのライナを一般古紙に混入させてリサイクルすると、抄紙工程でスクリ−ンが詰まり、操業トラブルの原因となり、製品とならない。従って、一般古紙への混入は行わないで、廃棄処分されている。しかし、近年に於いては環境保護のためにリサイクル運動が各地で盛んに行われており、ますます古紙を回収し、原料として再生し、再び紙製品としてリサイクルすることが望まれ、機能性を付与した特殊紙も例外扱いすることはできない。 The other reason why liners laminated with polyethylene or polypropylene resin are not recycled is that when these liners are mixed with general waste paper and recycled, the screen becomes clogged during the papermaking process, causing operational troubles. Not. Therefore, it is discarded without mixing into general waste paper. However, in recent years, recycling activities are actively carried out in various places to protect the environment, and it is increasingly desired to collect used paper, recycle it as raw material, and recycle it as paper products. The special paper provided cannot be treated as an exception.
そこで、上記の耐油性の要求品質及び／又は回収再生等リサイクル性を満足する耐油紙に関して、種々の提案（例えば、特許文献１、特許文献２、特許文献３、特許文献４を参照。）が知られている。 Therefore, various proposals (see, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4) regarding the oil-resistant paper satisfying the required quality of oil resistance and / or recycling properties such as recovery and recycling. Are known.
特許文献１〜３に記載された発明は、フッ素系耐油剤を使用したものであり、このフッ素系耐油剤を添加することにより、高い耐油度を有する加工紙が得られ、ポリエチレンコート紙、グラシン紙、パーチメント紙及びワックス含有紙よりも優れた耐油性が得られるといわれている。しかし、フッ素系耐油剤は、加工紙に撥水性も付与されるため、各種印刷方式による印刷適性が悪くなり、水系での離解によるリサイクルが困難となるという問題がある。 The inventions described in Patent Documents 1 to 3 use a fluorinated oil proofing agent, and by adding this fluorinated oil proofing agent, a processed paper having high oil resistance can be obtained. Polyethylene coated paper, glassine It is said that oil resistance superior to paper, parchment paper and wax-containing paper is obtained. However, since the fluorine-based oil proofing agent imparts water repellency to the processed paper, there is a problem that printing suitability by various printing methods is deteriorated and recycling by water disaggregation becomes difficult.
このようなフッ素系耐油剤における問題の解決を試みた特許文献４では、顔料とアクリル系ディスパージョンとスチレンブタジェン系ディスパージョンの混合物を表面に塗工した製袋用等に使用する耐水耐油紙が紹介されている。
上記特許文献４によると、印刷適性が改善され、回収再生等リサイクルが可能となるようであるが、しかしながら、冷凍えびや油分を含んだピザ、コロッケ、フライドポテト、天ぷら、シュウマイ、たこ焼きなどの種々の冷凍、冷蔵品や生鮮食品の運搬、保存に用いられる段ボールケースに利用しようとした場合、特に冷凍庫や冷蔵庫の低温下という過酷な条件で使用された場合には、段ボールケースにおいて特有に要求される容器の折り返し罫線部で、耐油性を付与した塗被層に割れが発生し、この部分の耐油性が損なわれ、油の染み出しが発生する。こうして耐油性が失われると、酷い場合には段ボールケースが潰れてしまうという致命的な問題が発生し、冷凍保存や冷蔵保存に用いられる段ボールケースには利用できないという問題があった。 According to the above-mentioned patent document 4, printability is improved, and recycling such as recovery and regeneration is possible. However, various kinds of pizza, croquettes, french fries, tempura, shumai, takoyaki containing frozen shrimp and oil are included. When used in cardboard cases used for transporting and storing refrigerated, refrigerated and fresh foods, especially when used in harsh conditions such as low temperatures in freezers and refrigerators, it is specifically required for cardboard cases. In the folded ruled line portion of the container, cracks occur in the coating layer imparted with oil resistance, the oil resistance of this portion is impaired, and oil seepage occurs. If the oil resistance is lost in this way, there is a fatal problem that the corrugated cardboard case is crushed in severe cases, and there is a problem that it cannot be used for a corrugated cardboard case used for freezing storage or refrigerated storage.
本発明は、上記従来の問題点に鑑み、ライナ表面の耐油性を確保しつつ、印刷適性が良好で美粧性を確保でき、古紙としてリサイクルが可能で、かつ冷凍庫や冷蔵庫の低温下という過酷な条件でも使用可能な段ボールケースに用いられるライナを提供することを課題とする。 In view of the above-mentioned conventional problems, the present invention is capable of ensuring good oil resistance of the liner surface, ensuring good printability and ensuring cosmetics, being recyclable as waste paper, and being harsh under the low temperature of a freezer or refrigerator. It is an object to provide a liner used for a cardboard case that can be used under conditions.
本発明の段ボール用ライナは、紙層が３層以上で構成された段ボール用ライナにおいて、ライナの最表層を構成するパルプに針葉樹クラフトパルプが４０〜８０％含まれ、最表層の表面に、バインダーと顔料とを含む塗被層を設け、耐油度（キット数）を１２級以上としたものである。 The corrugated liner of the present invention is a corrugated liner composed of three or more paper layers. The pulp constituting the outermost layer of the liner contains 40 to 80% of softwood kraft pulp, and a binder is formed on the surface of the outermost layer. And a coating layer containing a pigment and an oil resistance (the number of kits) of 12 or more.
この構成によると、特に冷凍庫や冷蔵庫の低温下という過酷な条件で使用された場合に、段ボールケースにおいて特有に要求される容器の折り返し罫線部での割れが発生することなく、段ボールケースとして要求される品質を満足し、かつ付加機能として要求される耐油性を確保することができる。また、良好な印刷適性を呈し、フレキソ印刷やグラビア印刷により美粧性を確保することができるとともに、古紙としてリサイクルが可能である。 According to this configuration, it is required as a corrugated cardboard case without causing cracks in the folded ruled line portion of the container, which is specifically required in the corrugated cardboard case, particularly when used under severe conditions such as a freezer or a refrigerator at low temperatures. The oil resistance required as an additional function can be ensured. In addition, it exhibits good printability, can ensure cosmetic properties by flexographic printing and gravure printing, and can be recycled as used paper.
一般的な白ライナーには、段ボールケースに使用されるライナーとしての圧縮強度、また美粧性を得るための印刷適性が要求される。この場合、必要な強度は白ライナーの中層や裏層に使用する原料を段ボール古紙や雑誌古紙、あるいは地券古紙等から選択し、又紙力増強剤などの薬品により調整する。一方、白ライナーの最表層は、印刷適性を高めるために、すなわち、最表層が平坦で緻密になるようにパルプ繊維が細く短い広葉樹クラフトパルプからなる上白古紙やあるいはバージン広葉樹クラフトパルプだけを適宜組合せ、いずれにしても広葉樹クラフトパルプを用いることが一般的である。一般的な段ボールケースの使用方法においては、これらの原料構成であっても特に罫線部の割れが発生することはない。しかしながら、本発明のような耐油性能を付与した特殊なライナーには、冷凍庫や冷蔵庫の低温化という過酷な条件下で使用したとしても、罫線部の割れを生じず、かつ美粧性を得るための良好な印刷適性が必要である。そこで本発明者らは鋭意研究の結果、以下に説明する顔料、バインダーを主成分とする塗披液の構成と最表層の原料構成との相乗効果により、必要な耐油度を保ちながら低温化でも罫線部の割れがなく、印刷適性にも優れる段ボール用ライナーを得ることができた。すなわち、本発明の塗披液の構成とライナー最表層の原料構成においてライナーの最表層を構成する原料パルプとしては、針葉樹クラフトパルプを４０〜８０質量％含むことが必要である。特に針葉樹クラフトパルプを５０〜６０質量％含有することがより好ましい。最表層中に針葉樹クラフトパルプが８０質量％を越えて含有した場合には、印刷適性が劣り美粧性を確保できない。また針葉樹クラフトパルプが４０重量％未満になると、本発明の塗披液を使用しても低温条件下においては、罫線部での割れが生じてしまうのである。 A general white liner is required to have a compressive strength as a liner used for a corrugated cardboard case and a printability for obtaining a cosmetic appearance. In this case, the required strength is adjusted by selecting a raw material to be used for the middle layer or the back layer of the white liner from corrugated used paper, magazine used paper, or old paper used as a paper, and by using a chemical such as a paper strength enhancer. On the other hand, for the outermost layer of the white liner, in order to improve printability, that is, only white paper made of short hardwood kraft pulp with thin pulp fibers or virgin hardwood kraft pulp is used as appropriate so that the outermost layer is flat and dense. In any case, it is common to use hardwood kraft pulp. In a general method of using a corrugated cardboard case, the ruled line portion is not particularly cracked even with these raw material configurations. However, the special liner imparted with oil resistance as in the present invention does not cause cracking of the ruled line portion even when used under severe conditions such as low temperature in a freezer or a refrigerator, and to obtain cosmetics. Good printability is required. Therefore, as a result of diligent research, the present inventors have conducted a synergistic effect of the composition of the coating liquid mainly composed of pigments and binders described below and the raw material composition of the outermost layer, so that even at low temperatures while maintaining the required oil resistance. It was possible to obtain a cardboard liner having no cracks in the ruled line portion and excellent printability. That is, the raw material pulp constituting the outermost layer of the liner in the composition of the coating liquid and the raw material structure of the outermost liner layer of the present invention needs to contain 40 to 80% by mass of softwood kraft pulp. In particular, it is more preferable to contain 50 to 60% by mass of softwood kraft pulp. When softwood kraft pulp contains more than 80% by mass in the outermost layer, the printability is inferior and cosmetic properties cannot be secured. When the softwood kraft pulp is less than 40% by weight, cracks at the ruled line portion occur under low temperature conditions even when the coating liquid of the present invention is used.
バインダーはアクリル酸エステル共重合体から成り、顔料は再生無機粒子、炭酸カルシウム、クレーを含む粉粒体から成るものが好ましい。バインダーにアクリル酸エステル共重合体を用いることにより、ライナが段ボールケースに加工された後に、特に冷凍庫や冷蔵庫の低温下という過酷な条件で使用された場合でも、段ボールケースにおいて特有に要求される罫線部での塗被層の割れを防止することができ、耐油性を確保することができる。また、顔料として再生無機粒子、炭酸カルシウム、クレーを含む粉粒体を用いることにより、良好な印刷適性を呈し、フレキソ印刷やグラビア印刷により美粧性を確保することができる。 The binder is preferably made of an acrylate copolymer, and the pigment is preferably made of a powdered particle containing regenerated inorganic particles, calcium carbonate and clay. By using an acrylic ester copolymer as the binder, the ruled lines that are specifically required in the cardboard case, even when the liner is processed into a cardboard case and used under severe conditions such as in a freezer or refrigerator. It is possible to prevent the coating layer from cracking at the part, and to ensure oil resistance. Further, by using a granular material containing regenerated inorganic particles, calcium carbonate, and clay as a pigment, good printability can be exhibited, and cosmetics can be secured by flexographic printing or gravure printing.
また、バインダーはアクリル酸エステル共重合体から成り、顔料は少なくともカルシウム、ケイ素及びアルミニウムを、酸化物換算で３０〜８２：９〜３５：９〜３５の質量割合で含有する再生無機粒子を含むものが好適である。顔料として再生無機粒子、炭酸カルシウム、クレーを含む粉粒体を用いることにより、良好な印刷適性を呈し、フレキソ印刷やグラビア印刷により美粧性を確保することができるが、中でもカルシウム、ケイ素及びアルミニウムを、酸化物換算で３０〜８２：９〜３５：９〜３５の質量割合で含有する再生無機粒子は、炭酸カルシウム、クレー、又シリカ粒子の特徴を併せ持ち、良好な印刷適性を発揮するとともに、その粒子構造が多孔性であることから保湿性に優れ、段ボールケースにおいて特有に要求される罫線部での塗被層の割れを抑制する効果を保有するので好ましい。 The binder comprises an acrylic ester copolymer, and the pigment contains regenerated inorganic particles containing at least calcium, silicon, and aluminum in a mass ratio of 30 to 82: 9 to 35: 9 to 35 in terms of oxides. Is preferred. By using regenerated inorganic particles, calcium carbonate, and a granular material containing clay as a pigment, it exhibits good printability and can ensure cosmetic properties by flexographic printing or gravure printing. The regenerated inorganic particles contained in a mass ratio of 30 to 82: 9 to 35: 9 to 35 in terms of oxides have the characteristics of calcium carbonate, clay, and silica particles, exhibit good printability, and Since the particle structure is porous, it is excellent in moisture retention and is preferable because it has the effect of suppressing cracking of the coating layer at the ruled line part that is specifically required in the cardboard case.
本発明のライナによれば、冷凍、冷蔵食品の段ボールケースなどとして１０℃〜−３０℃低温下という過酷な条件で使用された場合にも、段ボールケースにおいて特有に要求される容器の折り返し罫線部での割れが発生することなく、段ボールケースとして要求される品質を満足し、かつ付加機能として要求される耐油性を確保することができ、また良好な印刷適性を呈し、フレキソ印刷やグラビア印刷により美粧性を確保することができるとともに、古紙としてリサイクルが可能である。 According to the liner of the present invention, even when used under severe conditions of 10 ° C. to −30 ° C. as a corrugated cardboard case for frozen and refrigerated foods, the folded crease portion of the container that is specifically required in the corrugated cardboard case It can satisfy the quality required as a cardboard case without cracking at the same time, and can ensure the oil resistance required as an additional function, and exhibits good printability by flexographic printing and gravure printing. The cosmetics can be secured and recycled as used paper.
以下、本発明のライナの実施形態について、詳細に説明する。 Hereinafter, embodiments of the liner of the present invention will be described in detail.
本発明のライナは、紙層が３層以上で構成された段ボール用ライナにおいて、ライナの最表層を構成するパルプに針葉樹クラフトパルプが４０〜８０質量％含まれ、最表層の表面に、バインダーと顔料とを含む塗被層を設けたものである。段ボールに使用されるライナは、複数層例えば５層の紙層を有し、その最表層が白色である白ライナーが美粧印刷などの各種印刷を施すのに好適である。勿論、最表層の紙層を染料で染色したカラーライナであっても良い。 The liner of the present invention is a corrugated board liner composed of three or more paper layers. The pulp constituting the outermost layer of the liner contains 40 to 80% by mass of softwood kraft pulp, and the surface of the outermost layer includes a binder and A coating layer containing a pigment is provided. A liner used for corrugated cardboard has a plurality of layers, for example, five paper layers, and a white liner whose outermost layer is white is suitable for performing various types of printing such as cosmetic printing. Of course, a color liner obtained by dyeing the outermost paper layer with a dye may be used.
以下、５層の紙層からなるライナを例に説明する。ライナが５層の場合、塗被層を設ける最表層（１層目）の紙層は、針葉樹クラフトパルプと上質紙（ＬＢＫＰ、ＮＢＫＰを原料として抄造した紙）の裁落や白損などから成る上白古紙を主原料とする原料パルプを用いて抄造し、表下層（２層目）の紙層は、上白古紙と印刷用塗被紙などの各塗被紙の裁落、白損から成るケント古紙などを配合したものを主原料とする原料パルプを用いて抄造し、中間層（３〜４層目）及び裏層（５層目）の紙層は、紙器製造時に発生する裁落、損紙、新聞古紙、雑誌古紙などを原料として抄造した白ボールなどから成る地券古紙や段ボール古紙を主原料とする原料パルプを用いて抄造される。このようなライナは長網抄紙機、円網抄紙機などにより各層の紙層を順次抄き合わせることによって抄造される。ライナの坪量は、１２０〜４００ｇ／ｍ2程度のものが、保存用、輸送用の段ボールケースなどに用いるのに適している。 Hereinafter, a liner composed of five paper layers will be described as an example. When the liner is five layers, the outermost layer (first layer) paper layer on which the coating layer is provided consists of cutting or white loss of softwood kraft pulp and fine paper (paper made from LBKP and NBKP). Paper is made from raw pulp made mainly from upper white waste paper, and the paper layer of the upper and lower layers (second layer) is from the cutting and white loss of each coated paper such as upper white waste paper and coated paper for printing. The paper layer of the intermediate layer (3rd to 4th layer) and the back layer (5th layer) is cut off during the manufacture of the paper container. The paper is made using raw paper made of waste paper, waste paper, waste paper, magazine waste paper, etc. made of white paper, etc. Such a liner is made by sequentially combining the paper layers of each layer with a long paper machine, a circular paper machine, or the like. A liner having a basis weight of about 120 to 400 g / m 2 is suitable for use in a cardboard case for storage or transportation.
こうして抄造されたライナの最表層上には塗工液が塗工される。塗工液を構成するバインダーとしては、アクリル酸エステル共重合体などの耐油性を有するものが用いられる。特に、アクリル酸エステル共重合体でガラス相転移点(Ｔｇ) が１度以下のものが好適に使用でき、−５度以下のものがより好適に使用できる。こうすることで、本発明で得られるライナを、油分を含んだ生鮮食品はもちろんのこと、冷凍庫、冷蔵庫で使用する段ボールケースとして使用しても罫線部で塗工層が割れることがない。具体例としては例えば新中村化学工業株式会社製の商品名「ニューコートＭＴ−２７８０ＳＳ」（Ｔｇ＝−１２）などが好適に用いられるが、勿論これに限定されるものではない。 A coating solution is applied on the outermost layer of the liner thus made. As the binder constituting the coating solution, an oil-resistant one such as an acrylate copolymer is used. In particular, an acrylic ester copolymer having a glass phase transition point (Tg) of 1 degree or less can be preferably used, and a -5 degree or less can be more suitably used. By doing so, the coated layer does not break at the ruled line portion even when the liner obtained in the present invention is used as a corrugated cardboard case used in a freezer or refrigerator as well as fresh food containing oil. As a specific example, for example, trade name “New Coat MT-2780SS” (Tg = −12) manufactured by Shin-Nakamura Chemical Co., Ltd. is preferably used, but it is of course not limited thereto.
また、塗被層は、顔料１００重量部に対し、バインダーを２０〜２００部含有するものが好適に使用でき、バインダーを２５〜６０部含有するものがより好適に使用できる。こうすることで、耐油性と印刷適性の最適化を図ることができる。バインダーの配合量が２０部より少ないと耐油性が不十分となり、バインダーの配合量が２００部を超えると塗被液に占める顔料の割合が少なくなりすぎるため印刷適性が不良となり、フレキソ印刷やグラビア印刷により美粧性を確保することができない問題が生じる。 Moreover, the coating layer can use suitably what contains 20-200 parts of binder with respect to 100 weight part of pigments, and what contains 25-60 parts of binder can use it more suitably. By doing so, it is possible to optimize oil resistance and printability. If the blending amount of the binder is less than 20 parts, the oil resistance is insufficient, and if the blending amount of the binder exceeds 200 parts, the proportion of the pigment in the coating liquid becomes too small and the printability becomes poor. The problem that cosmetics cannot ensure cosmetics arises.
塗工液を構成する顔料としては、再生無機粒子、炭酸カルシウム、クレーが好適に使用できる。粒度は１〜１０μｍのものが好適である。具体的には、炭酸カルシウム「ＰＸ」（白石工業製、平均粒度１．８μｍ）や、脱墨フロスを主原料とし、脱水工程、乾燥工程、焼成工程、粉砕工程を経て得られた、カルシウム、ケイ素及びアルミニウムを、酸化物換算で３０〜８２：９〜３５：９〜３５の質量割合で含有し、かつ、前記カルシウム、前記ケイ素及び前記アルミニウムの合計含有割合が、９０質量％以上である再生無機粒子などが好適に用いられる。 As the pigment constituting the coating liquid, regenerated inorganic particles, calcium carbonate, and clay can be suitably used. The particle size is preferably 1 to 10 μm. Specifically, calcium carbonate “PX” (manufactured by Shiraishi Kogyo Co., Ltd., average particle size 1.8 μm) and deinking floss as the main raw materials, calcium obtained through a dehydration step, a drying step, a firing step, and a pulverization step, The reproduction | regeneration which contains silicon and aluminum by the mass ratio of 30-82: 9-35: 9-35 in oxide conversion, and the total content rate of the said calcium, the said silicon, and the said aluminum is 90 mass% or more Inorganic particles are preferably used.
これらの顔料の配合比は、固形分質量比で、顔料とバインダーを１００：２０〜２００の重量比率とするのが好適である。この配合比率よりバインダーの配合量が少ないと、耐油性が不十分となり、逆に顔料の配合量が少ないと印刷適性が不良となり、フレキソ印刷やグラビア印刷により美粧性を確保することができない。 The mixing ratio of these pigments is a solid mass ratio, and it is preferable that the pigment and the binder have a weight ratio of 100: 20 to 200. If the blending amount of the binder is less than this blending ratio, the oil resistance becomes insufficient, and conversely if the blending amount of the pigment is small, the printability becomes poor, and the cosmetic properties cannot be secured by flexographic printing or gravure printing.
前記再生無機粒子について詳細を説明すると、本発明で使用する再生無機粒子は、脱墨フロスを焼成して得られた循環使用可能なものなので、廃棄物としての埋立などの処分が不要であり、環境に優しく、省資源に貢献するものである。また、原料が古紙処理工程から発生する脱墨フロスであるため安価であり、新たな無機粒子の使用量を抑えることができるため、製造コストが削減される。 When the details of the regenerated inorganic particles are described, the regenerated inorganic particles used in the present invention are those that can be circulated and obtained by firing deinked floss, so that disposal such as landfill as waste is unnecessary, It is environmentally friendly and contributes to resource conservation. In addition, since the raw material is deinking floss generated from the waste paper processing step, it is inexpensive and the amount of new inorganic particles used can be suppressed, so that the manufacturing cost is reduced.
また、この再生無機粒子は、カルシウムが酸化物換算で３０質量割合以上とされているので、内添した紙の白色度が高くなる。炭酸カルシウムには、六方結晶系のカルサイト結晶（方解石）や、斜方結晶系のアラゴナイト結晶（あられ石）などの同質異像があり、天然に産する石灰石はそのほとんどがカルサイト系で、貝殻類にはカルサイト結晶のほかアラゴナイト結晶がある。また、炭酸カルシウムには、天然には存在しないがバテライト系がある。脱墨フロスから得られるカルシウムは多種多様であるが、焼成凝集化することでほぼ均一の炭酸カルシウム性状となる。したがって、無機微粒子そのものの品質安定性に寄与し、異なる成分で構成される凝集体でありながら、性状が安定した無機微粒子が得られる。 In addition, since the regenerated inorganic particles have a calcium content of 30% by mass or more in terms of oxide, the whiteness of the internally added paper is increased. Calcium carbonate has homogeneity such as hexagonal crystal calcite crystal (calcite) and orthorhombic crystal aragonite crystal (arreite), and most of the limestone produced naturally is calcite. Shells include aragonite crystals in addition to calcite crystals. Calcium carbonate has a vaterite system that does not exist in nature. There are various types of calcium obtained from deinking floss, but when calcined and agglomerated, almost uniform calcium carbonate properties are obtained. Therefore, inorganic fine particles that contribute to the quality stability of the inorganic fine particles themselves and have stable properties while being aggregates composed of different components can be obtained.
また、この再生無機粒子は、ケイ素を含むところ、ケイ素からなるシリカの１次粒子は微細なので、光学的屈折率が高い。したがって、ケイ素が酸化物換算で９質量割合以上とされている再生無機粒子を顔料として使用した場合、吸水性に優れる特徴がある。耐油性をもつバインダーは、その機能に反し、インクの吸水性を阻害するため、ケイ素が酸化物換算で９質量割合以上とされている再生無機粒子を顔料として使用することで、吸水性を保持し、良好な印刷を行うことができる。 In addition, since the regenerated inorganic particles contain silicon, the primary particles of silica composed of silicon are fine, so that the optical refractive index is high. Therefore, when regenerated inorganic particles in which silicon is 9 mass percent or more in terms of oxide are used as a pigment, there is a characteristic that water absorption is excellent. The oil-resistant binder is contrary to its function and inhibits the water absorption of the ink, so that the water absorption is maintained by using the regenerated inorganic particles whose silicon is 9 mass% or more in terms of oxide as the pigment. And good printing can be performed.
以上のように調製した塗工液をバーコーターなどの塗工機により４〜２５ｇ／ｍ2の塗工量でライナの最表層の表面上に塗工する。塗工量が４ｇ／ｍ2未満では、十分な耐油性及び印刷適性を確保できず、２５ｇ／ｍ2を越えると、効果が頭打ちとなって薬品コストが高くなる。また、冷凍えびや油分を含んだピザ、コロッケ、フライドポテト、天ぷら、シュウマイ、たこ焼きなどの種々の冷凍、冷蔵品や生鮮食品に用いられる段ボールケースにおいて満足する耐油性及び良好な印刷適性を確保し、またライナ製造時のコスト、操業性などを考慮すると、塗工量は６〜１２ｇ／ｍ2とすることがより好ましい。 The coating solution prepared as described above is applied onto the surface of the outermost layer of the liner at a coating amount of 4 to 25 g / m 2 using a coating machine such as a bar coater. If the coating amount is less than 4 g / m 2 , sufficient oil resistance and printability cannot be ensured, and if it exceeds 25 g / m 2 , the effect reaches its peak and the chemical cost increases. In addition, to ensure satisfactory oil resistance and good printability in corrugated cardboard cases used for various frozen, refrigerated products and fresh foods such as frozen shrimp and oil-containing pizza, croquettes, french fries, tempura, shumai, takoyaki, etc. Further, in consideration of cost at the time of liner production, operability, etc., the coating amount is more preferably 6 to 12 g / m 2 .
もちろん、原紙への塗被液の塗工方法は、バーコーターに限ったものではなく、一般的に用いられるブレードコータ、エアナイフコータ、ロールコータ、カーテンコータ、サイズプレスコータ等の塗工装置によって行うことができる。 Of course, the coating method of the coating liquid on the base paper is not limited to the bar coater, but is performed by a commonly used coating apparatus such as a blade coater, an air knife coater, a roll coater, a curtain coater, or a size press coater. be able to.
こうして塗工液を塗工した後、必要に応じて、マシンカレンダーにてカレンダー処理を行っても良い。 After coating the coating solution in this way, calendar processing may be performed using a machine calendar as necessary.
なお、塗工液を塗工する前の原紙のサイズ度は、ＪＩＳ８１４０に準じて行い、蒸留水との接触時間は１２０秒として、６０ｇ／ｍ2〜１５０ｇ／ｍ2とすることが好ましい。紙面の白紙光沢、印刷光沢を高めるために、ライナ表面に顔料とバインダーを塗被するいわゆるコートライナの場合、原紙表面のコブサイズ度を４０〜６０ｇ／ｍ2とすることが一般的である。しかし、冷凍えびや油分を含んだピザ、コロッケ、フライドポテト、天ぷら、シュウマイ、たこ焼きなどの種々の冷凍保存や冷蔵保存に用いられる段ボールケースでは、特別、使用される過酷な温度環境と耐油性を確保する必要性から、塗工液を塗工する前の原紙のサイズ度は６０ｇ／ｍ2〜１５０ｇ／ｍ2とすることが好ましい。 The size of the front of the base paper of applying the coating solution, carried out according to JIS8140, contact time with distilled water as 120 seconds, it is preferable to 60g / m 2 ~150g / m 2 . In the case of a so-called coat liner in which a pigment and a binder are coated on the liner surface in order to increase the white paper gloss and printing gloss of the paper surface, it is general that the degree of bump size on the surface of the base paper is 40 to 60 g / m 2 . However, cardboard cases used for various frozen and refrigerated storage such as frozen shrimp and oil-containing pizza, croquettes, fried potatoes, tempura, shumai, takoyaki, etc., have special, harsh temperature environments and oil resistance. the need to ensure the size of the front of the base paper of applying the coating solution is preferably set to 60g / m 2 ~150g / m 2 .
すなわち、６０ｇ／ｍ2未満のサイズ効果の高い原紙に塗工液を塗被した場合は、塗被液中のバインダーが原紙に浸透する割合が少なく、塗被層と原紙の接着強度が弱いために、段ボールケースに加工後、罫線部を折り曲げた際に、塗被層と原紙が剥離するという問題が生じる。一方、１５０ｇ／ｍ2を超えるサイズ効果の低い原紙に塗工液を塗被した場合は、塗被液中のバインダーが原紙に浸透しすぎ、要求される耐油性を確保することが難しくなる。 That is, when the coating liquid is applied to a base paper having a high size effect of less than 60 g / m 2 , the binder in the coating liquid has a low ratio of penetrating into the base paper, and the adhesive strength between the coating layer and the base paper is weak. In addition, there is a problem that when the ruled line portion is bent after being processed into a cardboard case, the coating layer and the base paper are peeled off. On the other hand, when the coating liquid is applied to the base paper having a low size effect exceeding 150 g / m 2 , the binder in the coating liquid permeates the base paper too much, and it is difficult to ensure the required oil resistance.
次に、本発明のいくつかの実施例と比較例を説明する。 Next, some examples and comparative examples of the present invention will be described.
（実施例１）
第１層の最表層は針葉樹クラフトパルプと上白古紙を４０：６０の重量比で配合した原料スラリーを用い、第２層の表下層は上白古紙とケント古紙を５０：５０の重量比で配合した原料スラリーを用い、第３層〜第５層の中間層及び裏層は地券古紙を原料スラリーに用い、これらの第１〜第５層の紙層を抄き合わせ、ライナの最表層上に次の組成顔料として炭酸カルシウム（商品名：「炭酸カルシウムＰＸ」／白石工業製）１００部に対し、バインダーとしてアクリル酸エステル（Ｔｇ＝３℃）１５部を混合して調製した塗工液をバーコーターにて２ｇ／ｍ2の塗工量で塗工し、その後マシンカレンダーにて、線圧３０ｋｇｆ／ｃｍの条件でカレンダー処理し、坪量が２２０ｇ／ｍ2の５層構造のライナを得た。なお、実施例で使用した上白古紙の原料パルプはＬＢＫＰ１００％であった。また、このライナに塗工液を塗工する前の原紙のコブサイズ度は１００ｇ／ｍ2であった。
Example 1
The outermost layer of the first layer uses a raw slurry in which softwood kraft pulp and upper white waste paper are blended at a weight ratio of 40:60, and the upper and lower layers of the second layer are upper white waste paper and Kent waste paper at a weight ratio of 50:50. Using the blended raw material slurry, the intermediate layer and the back layer of the third layer to the fifth layer use the ground paper waste paper as the raw material slurry, and the paper layers of these first to fifth layers are made together, and the outermost layer of the liner A coating solution prepared by mixing 15 parts of an acrylic ester (Tg = 3 ° C.) as a binder with 100 parts of calcium carbonate (trade name: “Calcium carbonate PX” / manufactured by Shiraishi Kogyo) as the following composition pigment. Is coated with a bar coater at a coating amount of 2 g / m 2 , and then calendered with a machine calender under the condition of a linear pressure of 30 kgf / cm to prepare a liner having a five-layer structure with a basis weight of 220 g / m 2. Obtained. The raw white pulp used in the examples was 100% LBKP. Further, the degree of bump size of the base paper before applying the coating solution to this liner was 100 g / m 2 .
（実施例２〜１４）
最表層の原料配合、塗被する顔料、顔料とバインダーの比率、バインダーのＴｇ、塗工量を表１のとおり変えた以外は実施例１と同様にライナを得た。
(Examples 2 to 14)
A liner was obtained in the same manner as in Example 1 except that the raw material composition of the outermost layer, the pigment to be coated, the ratio of the pigment to the binder, the Tg of the binder, and the coating amount were changed as shown in Table 1.
（比較例１）
塗被するバインダーにＰＶＡ（ポリビニールアルコール／Ｔｇ＝６５℃）を用いた以外は、実施例６と同様にした。
(Comparative Example 1)
The same operation as in Example 6 was performed except that PVA (polyvinyl alcohol / Tg = 65 ° C.) was used as a binder to be coated.
（比較例２）
塗被するバインダーにスチレン−アクリル共重合体（商品名：「ボンコート５４６２K」／大日本インキ化学工業（株）／Ｔｇ＝６℃）を用いた以外は、実施例６と同様にした。
(Comparative Example 2)
The same procedure as in Example 6 was conducted except that a styrene-acrylic copolymer (trade name: “Boncoat 5462K” / Dainippon Ink & Chemicals, Inc./Tg=6° C.) was used as the binder to be coated.
（比較例３）
第１層の最表層の原料配合を、針葉樹クラフトパルプと上白古紙を３０：７０の重量比で配合した原料スラリーを用いた以外は、実施例６と同様にした。上白古紙は実施例で使用した上白古紙と同じものを使用した。
(Comparative Example 3)
The raw material composition of the outermost layer of the first layer was the same as in Example 6 except that a raw material slurry in which softwood kraft pulp and upper white waste paper were blended at a weight ratio of 30:70 was used. The upper white paper used was the same as that used in the examples.
（比較例４）
第１層の最表層の原料配合を、針葉樹クラフトパルプと上白古紙を９０：１０の重量比で配合した原料スラリーを用いた以外は、実施例６と同様にした。上白古紙は実施例で使用した上白古紙と同じものを使用した。
(Comparative Example 4)
The raw material composition of the outermost layer of the first layer was the same as that of Example 6 except that a raw material slurry in which softwood kraft pulp and upper white waste paper were blended at a weight ratio of 90:10 was used. The upper white paper used was the same as that used in the examples.
以上の実施例１〜１４及び比較例１〜４のライナについて、耐油度の測定を行った。また、印刷適性の評価、罫線部の割れの評価、製造時の操業性・経済性を評価した。 About the liner of the above Examples 1-14 and Comparative Examples 1-4, the oil resistance was measured. In addition, evaluation of printability, evaluation of cracks in ruled line portions, and operability and economy during production were evaluated.
耐油度の評価は、ＴＡＰＰＩ ＵＭ−５５７法（キット法）の規定に従い、塗工面表面にひまし油、トルオール、ｎ−ヘキサンの混合比が異なる各種キットＮｏ. の試験液を１滴落とし、１５秒後にティッシュペーパーで滴下した試験液を拭き取って、試験液の浸透による汚れ、即ち油分が滲み込んで濡れた部分が生じなくても、はっきりとした黒い点が認められたら、不合格とし、合格した最大の液番号について、５点の平均値をキット指数として表現した。ＴＡＰＰＩＵＭ−５５７では、最高１２級であるが、これ以上の耐油性のものでは、更にトルオールの比率を減少させて、ｎ−ヘキサンを増量したもので測定する方法が提案されており、ｎ−ヘキサン１００％のキット液が滲み込まないものを、１６級とした改訂法に基づいて測定した。 The oil resistance is evaluated according to the provisions of the TAPPI UM-557 method (kit method). One drop of test solution of various kit numbers with different mixing ratios of castor oil, toluol and n-hexane is applied to the coated surface, and 15 seconds later. Wipe off the test solution dripped with tissue paper and reject it if a clear black spot is observed even if there is no stain due to the penetration of the test solution, i.e., the oil soaked and the wetted part does not occur. The average value of 5 points was expressed as a kit index. TAPPIUM-557 has a maximum of 12 grades, but for oil resistance higher than this, a method of measuring by increasing the amount of n-hexane by further reducing the ratio of toluol has been proposed. What was not impregnated with 100% of the kit solution was measured based on the revised method for grade 16.
印刷適性の評価には、ＪＩＳ−Ｐ８１２９で定めるＩＧＴ印刷適性試験機に用いる標準タックグレードインク（品番404.380.000）を用いて、熊谷理機工業（株）製ＫＲＫ万能印刷適性試験機を用いて印刷しRI印刷適性試験により測定し、次の評価基準
◎：インクの剥がれがなく、印面に影響なし
○：インクの剥がれは僅かにあるが、印面に影響はない
△：インクの剥がれがあり、印面に下地の現れるところがある
×：インクの剥がれ、印面の下地の現われともはなはだしい
とした。
For the evaluation of printability, the standard tack grade ink (product number 404.380.000) used in the IGT printability tester defined in JIS-P8129 is used, and the KRK universal printability tester manufactured by Kumagaya Riki Kogyo Co., Ltd. is used. Printed and measured by RI printing aptitude test, the following evaluation criteria ◎: No ink peeling, no effect on the printing surface ○: Ink peeling slightly, but no effect on the printing surface △: Ink peeling There is a place where the base appears on the seal surface. X: The ink is peeled off, and the appearance of the base surface of the seal surface is very serious.
塗工層の割れの評価には、一般中芯１２０ｇ／ｍ2と貼合したＡ段の両面段ボールシートを製作し、１０ｃｍの罫線部を含む試験片を−１５℃の冷蔵庫に２４時間置いた後、罫線部を９０度折り曲げて、罫線部を目視確認して
◎：塗工層の割れが全くない
○：塗工層表面にのみわずかな亀裂がある
△：塗工層は割れているが、原紙は割れていない
×：塗工層が明らかに割れ、割れは原紙まで達している
とした。
For evaluation of cracks in the coating layer, a double-sided cardboard sheet of A-stage bonded with a general core 120 g / m 2 was produced, and a test piece including a 10 cm ruled line portion was placed in a refrigerator at −15 ° C. for 24 hours. Then, the ruled line part is bent 90 degrees, and the ruled line part is visually confirmed. ◎: There is no crack in the coating layer. ○: There is a slight crack only on the surface of the coating layer. △: The coating layer is cracked. The base paper is not broken. X: The coating layer is clearly cracked, and the crack reaches the base paper.
表１によれば、ライナの最表層を構成するパルプに針葉樹クラフトパルプが４０〜８０％含まれ、最表層の表面に、アクリル酸エステル共重合体から成るバインダーと炭酸カルシウムや再生無機粒子の粉粒体（再生填料）から成る顔料とを含む塗被層を設け、耐油度（キット数）を１２級以上とした各実施例１〜１４からは、各々の組成による特性、特に再生填料を用いた場合の優位な特長が、表１から読み取れるが、全体として印刷適性、罫線部の割れ及び製造時の操業性・経済性の何れに対しても要求が満たされていることが分かる。これに対して、比較例のようにバインダーとしてＰＶＡを用いた場合には、耐油性及び罫線部の割れに対する特性が悪く、スチレン−アクリル共重合体を用いた場合や針葉樹クラフトパルプが４０％未満の場合には、罫線部の割れに対する特性が悪く、針葉樹クラフトパルプが６０％を大きく超えた場合には、印刷適性が悪くなることが分かる。 According to Table 1, 40 to 80% of softwood kraft pulp is contained in the pulp constituting the outermost layer of the liner, and the binder, calcium carbonate, and regenerated inorganic particle powder made of an acrylate ester copolymer are formed on the outermost surface. From Examples 1 to 14 in which a coating layer containing a pigment composed of granules (regenerated filler) is provided and the oil resistance (number of kits) is 12 or more, characteristics according to the respective compositions, in particular, regenerated fillers are used. The advantageous features of the case can be seen from Table 1, but it can be seen that the requirements are satisfied in terms of printability, cracks in the ruled line portion, and operability and economy at the time of production as a whole. On the other hand, when PVA is used as a binder as in the comparative example, the oil resistance and the property with respect to cracking of the ruled line portion are poor, and when styrene-acrylic copolymer is used or softwood kraft pulp is less than 40% In the case of, the characteristics with respect to cracking of the ruled line portion are poor, and it is understood that the printability deteriorates when the softwood kraft pulp greatly exceeds 60%.
Claims (1)
前記顔料は少なくとも、脱墨フロスを主原料とし、脱水工程、乾燥工程、焼成工程、粉砕工程を経て得られた、カルシウム、ケイ素、及びアルミニウムを、酸化物換算で３０〜８２：９〜３５：９〜３５の質量割合で含有し、かつ、前記カルシウム、前記ケイ素及び前記アルミニウムの合計含有割合が、９０質量％以上である凝集体である再生無機粒子を含む粉粒体から成り、
耐油度（キット数）を１２級以上としたことを特徴とする段ボール用ライナ。 In the liner for corrugated board having three or more paper layers and a basis weight of 120 to 400 g / m 2 , the pulp constituting the outermost layer of the liner contains 40 to 80% by mass of softwood kraft pulp, and the surface of the outermost layer A coating layer containing a binder and a pigment made of an acrylate copolymer,
The pigment contains at least deinked floss as a main raw material, and calcium, silicon, and aluminum obtained through a dehydration step, a drying step, a firing step, and a pulverization step, in terms of oxides, 30 to 82: 9 to 35: It is contained in a mass ratio of 9 to 35, and consists of a granular material containing regenerated inorganic particles that are aggregates in which the total content ratio of the calcium, silicon, and aluminum is 90% by mass or more,
A liner for corrugated board characterized by oil resistance (number of kits) of 12 or more.
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