JP4952526B2 - Coating liner and cardboard using the same - Google Patents
Coating liner and cardboard using the same Download PDFInfo
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- JP4952526B2 JP4952526B2 JP2007293908A JP2007293908A JP4952526B2 JP 4952526 B2 JP4952526 B2 JP 4952526B2 JP 2007293908 A JP2007293908 A JP 2007293908A JP 2007293908 A JP2007293908 A JP 2007293908A JP 4952526 B2 JP4952526 B2 JP 4952526B2
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- 239000011248 coating agent Substances 0.000 title claims description 50
- 238000000576 coating method Methods 0.000 title claims description 50
- 239000011111 cardboard Substances 0.000 title claims description 33
- 239000000123 paper Substances 0.000 claims description 55
- 239000010410 layer Substances 0.000 claims description 32
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 27
- 239000005995 Aluminium silicate Substances 0.000 claims description 26
- 235000012211 aluminium silicate Nutrition 0.000 claims description 26
- 239000000049 pigment Substances 0.000 claims description 24
- 239000011247 coating layer Substances 0.000 claims description 20
- 239000000853 adhesive Substances 0.000 claims description 18
- 230000001070 adhesive effect Effects 0.000 claims description 16
- 239000003973 paint Substances 0.000 claims description 13
- 239000000454 talc Substances 0.000 claims description 13
- 229910052623 talc Inorganic materials 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 238000007639 printing Methods 0.000 description 55
- 239000000976 ink Substances 0.000 description 44
- 230000000052 comparative effect Effects 0.000 description 29
- 229920001131 Pulp (paper) Polymers 0.000 description 17
- 238000000034 method Methods 0.000 description 17
- 239000010893 paper waste Substances 0.000 description 16
- 238000011161 development Methods 0.000 description 15
- 239000002344 surface layer Substances 0.000 description 15
- 230000000007 visual effect Effects 0.000 description 13
- 229920003002 synthetic resin Polymers 0.000 description 10
- 239000000057 synthetic resin Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000004816 latex Substances 0.000 description 9
- 229920000126 latex Polymers 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 8
- 239000002655 kraft paper Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- -1 satin white Chemical compound 0.000 description 6
- 229920002472 Starch Polymers 0.000 description 5
- 239000000975 dye Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 4
- 239000002537 cosmetic Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229940097275 indigo Drugs 0.000 description 4
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 239000008107 starch Substances 0.000 description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 3
- 229910001919 chlorite Inorganic materials 0.000 description 3
- 229910052619 chlorite group Inorganic materials 0.000 description 3
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 3
- 238000004040 coloring Methods 0.000 description 3
- 238000007646 gravure printing Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer 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
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 239000010897 cardboard waste Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000001953 sensory effect Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000005956 Cosmos caudatus Nutrition 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 240000000907 Musa textilis Species 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000007774 anilox coating Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding 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
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000006266 etherification reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Paper (AREA)
Description
本発明は、塗工ライナー及びそのライナーを用いた段ボールに関する。特に、フレキソ印刷のインキ発色性の優れた美粧段ボール用のライナーとして用いることが出来るものである。 The present invention relates to a coating liner and corrugated cardboard using the liner. In particular, it can be used as a liner for cosmetic corrugated cardboard having excellent ink color development properties for flexographic printing.
一般に、ライナーは３〜９層の多層抄きされた厚紙で、中層にはコスト及び省資源を目的として、脱墨されない古紙パルプが使用される。ライナーは中芯原紙と組み合わせて段ボールシートに加工され、各種包装箱等に使用されるが、近年段ボール箱の機能が、商品を保管・輸送などの流通過程で受ける物理的な力から守るだけでなく、商品が詰められたまま展示、あるいはセリ等に見られるように商品の顔としての機能を付加するために多色印刷が多く行われようになった。このため印刷方式のなかでもオフセットやグラビア印刷と比べ、技術進歩が目覚ましいフレキソ印刷が、小ロット多品種化や環境と安全性問題、コスト削減などの市場課題に対して、近年のデジタル化の波とともに、画期的で斬新な技術でもって注目されている。さらに印刷品質についても、他の印刷方式と比較しても遜色なく、水性化や無溶剤化の面で大きな優位性が認められ、欧米の包装分野では既にフレキソ印刷が主流となっており、日本においても普及の兆しがある。このよう情勢のなかで、通常のクラフト色以外に、見栄えのある目立つ多色印刷が行われる美粧ライナーと呼ばれるライナーは、表層に晒パルプや上白古紙パルプを配合したり、白色顔料塗料を塗工し、表面の白色度を高めるたりすることによって製造されていた。また、表層のみの対策はコストがかかることから、表下層（表層の直下の層）にもある程度白色度のあるパルプを用いて、中層の色を隠蔽する作用を持たせることもある。この様な白色度の高い外観を持ったものは、白紙面だけでなく、これに印刷した場合、印刷面が美麗かつ鮮やかに見える効果を与える。このため、この種のライナーを使用して、カラー印刷を施した段ボ−ル箱は、人の目を引く効果が高く、更に、内容物を忠実に表するために、内容物の優良性を強く訴えることが出来る優れた面がある。近年、量販店を中心に、店頭に段ボ−ル箱に製品を詰めたまま販売するということがよく見受けられるようになって来ており、この点からも印刷面が美麗で鮮やかなライナーが求められている。
In general, the liner is a cardboard made of 3 to 9 layers, and used for the middle layer is waste paper pulp that is not deinked for the purpose of cost and resource saving. Liners are processed into cardboard sheets in combination with core base paper and used in various packaging boxes. However, in recent years, the function of cardboard boxes has only to be protected from physical forces that are received during the distribution process such as storage and transportation. In addition, many multi-color printing has been carried out in order to add a function as a product face so that the product can be seen on display or in a cellar with the product packed. For this reason, flexo printing, which has made remarkable technological progress compared to offset and gravure printing, is a recent wave of digitization in response to market issues such as the increase in variety of small lots, environmental and safety issues, and cost reduction. At the same time, it is attracting attention with its innovative and innovative technology. Furthermore, the print quality is comparable to other printing methods, and has a great advantage in terms of water-based and solvent-free. Flexo printing has already become mainstream in the packaging field in Europe and the United States. There are signs of dissemination. Under such circumstances, in addition to the usual craft colors, liners called cosmetic liners, which perform multi-colored printing with outstanding appearance, are blended with bleached pulp or upper white waste paper pulp on the surface, or coated with white pigment paint. It was manufactured by working and increasing the whiteness of the surface. Further, since measures for the surface layer alone are costly, pulp having a certain degree of whiteness may be used for the surface lower layer (layer immediately below the surface layer) to conceal the color of the intermediate layer. Those having such a high whiteness appearance give not only a blank paper surface but also an effect that the printed surface looks beautiful and vivid when printed on it. For this reason, corrugated cardboard boxes that have been color-printed using this type of liner have a high eye-catching effect, and in order to faithfully represent the contents, the contents are excellent. There is an excellent aspect that can appeal strongly. In recent years, it has become common to sell products packed in cardboard boxes at stores, mainly from mass retailers. From this point of view, a beautiful and vivid liner has been printed. It has been demanded.
このため、ライナー表面の白色度と色相を所定の範囲に調整することにより、白紙外観、印刷外観も深みのある落ち着いた視覚効果を与えるライナーが開示されている。（特許文献１参照）また、顔料とバインダーを主成分として含有する塗工層により、白色度と色相及び光沢を特定範囲に調整することにより白紙面では落ち着いた視覚効果を与えるとともに、印刷の文字が読み易く、さらにカラー印刷するとインキ発色性が良好で印刷光沢が良好で印刷面が鮮明な美粧ライナーが開示されている。（特許文献２参照）しかしながら、これらの開示はいずれもライナーとしての色相を規定しているだけで、フレキソ印刷における印刷適性を十分満足させる提案になっていない。また、一般の茶ライナーに白インキを多量に印刷した上に、多色を印刷して、美粧性を付加する方法が行われているが、この場合、茶ライナー表面を白くし、赤や藍など多色インキの仕上がりをよくするために、高価な白インキを多量に印刷する必要があり、この方法も経済的に大きな負担となっている。 For this reason, a liner that provides a calm visual effect with a deep white paper appearance and printed appearance by adjusting the whiteness and hue of the liner surface to a predetermined range is disclosed. (See Patent Document 1) In addition, the coating layer containing pigment and binder as main components adjusts the whiteness, hue, and gloss to a specific range, thereby providing a calm visual effect on a blank sheet and printing characters. A cosmetic liner is disclosed that is easy to read, and has good color development, good printing gloss, and a clear printed surface when printed in color. However, all of these disclosures merely define the hue as a liner, and are not proposals that sufficiently satisfy the printability in flexographic printing. In addition, there is a method in which a large amount of white ink is printed on a general brown liner and then multicolor is printed to add cosmetics. In this case, the surface of the brown liner is made white, red or indigo. In order to improve the finish of multi-color inks, etc., it is necessary to print a large amount of expensive white ink, and this method is also a large economical burden.
さらに、フレキソ印刷性の優れたライナーを得る方法として、ライナー表面にカチオン性の樹脂を塗布することにより印刷効果を向上させる技術が開示されている。（特許文献３、４を参照）しかしながら、インキの発色や印刷面の仕上がりに関して、十分満足できるものではなかった。 Furthermore, as a method for obtaining a liner having excellent flexographic printability, a technique for improving the printing effect by applying a cationic resin to the liner surface is disclosed. (Refer to Patent Documents 3 and 4) However, the color development of the ink and the finish of the printed surface are not fully satisfactory.
また、顔料と接着剤を主成分とする水性組成物をライナー原紙に塗工する際のその水性組成物中の顔料組成として（ａ）焼成カオリンが２０〜７０重量部、（ｂ）構造化カオリンおよび/またはデラミネーテッドカオリンが１５〜７７重量部、および（ｃ）プラスチックピグメントが３〜２０重量部含有せしめられ、かつ（ａ）＋（ｂ）＋（ｃ）の合計が７０重量部以上である塗工ライナーが開示されている(特許文献５参照)。しかしながら、その目的とするところは、グラビア印刷に適した、かつ白紙光沢、印刷光沢に優れた塗工ライナーを得ることにあり、この顔料組成の塗工層を持ったライナーを水性フレキソ印刷すると、インキ濃度が劣り、印刷仕上がりに劣るものしか得られない。さらに、フレキソ印刷のモトリングの発生がない、白紙光沢および印刷光沢に優れた塗工ライナーを得るために、塗被層面の平滑度特性として、加圧型平滑度計で加圧条件５ｋｇｆ／ｃｍ２で測定したときの平滑度が３．０μｍ以下で、２０ｋｇｆ／ｃｍ２で測定した平滑度との比が０．３〜０．８である塗工ライナーが提案されている（特許文献６参照）。この提案は、通常の塗工ライナーは平滑が低くモトリングが発生しやすいこと、印刷光沢を高めたいことから、適正な平滑化を規定することで課題を解決したものであるが、規定の平滑性では塗被層のインキ吸収性が劣り、特にインキの発色性が不十分なレベルでしか得られない。 Further, (a) 20 to 70 parts by weight of calcined kaolin (b) structured kaolin as a pigment composition in the aqueous composition when an aqueous composition mainly composed of a pigment and an adhesive is applied to liner base paper And / or 15 to 77 parts by weight of delaminated kaolin, and (c) 3 to 20 parts by weight of plastic pigment, and the total of (a) + (b) + (c) is 70 parts by weight or more. A coating liner is disclosed (see Patent Document 5). However, its purpose is to obtain a coating liner suitable for gravure printing and excellent in blank paper gloss and printing gloss, and when a liner having a coating layer of this pigment composition is subjected to aqueous flexographic printing, Only inks with inferior ink density and inferior print finish can be obtained. Furthermore, in order to obtain a coating liner excellent in blank paper gloss and printing gloss without occurrence of flexo printing mottling, as a smoothness characteristic of the coating layer surface, a pressure type smoothness meter was used under a pressure condition of 5 kgf / cm 2 . A coating liner having a smoothness of 3.0 μm or less when measured and a ratio of 0.3 to 0.8 with the smoothness measured at 20 kgf / cm 2 has been proposed (see Patent Document 6). This proposal solves the problem by specifying appropriate smoothing because normal coating liners are low in smoothness and tend to cause mottling and to increase printing gloss. In this case, the ink absorption of the coating layer is inferior, and in particular, the ink coloring property can be obtained only at an insufficient level.
本発明は、目視で十分な白さを有し、フレキソ印刷インキ、特に水性フレキソインキに対して優れたインキ発色性と印刷均一性を有するライナーおよびそれを用いた段ボールを提供するものである。 The present invention provides a liner having sufficient whiteness by visual inspection and having excellent ink colorability and printing uniformity for flexographic printing inks, particularly aqueous flexographic inks, and a corrugated cardboard using the same.
本発明者等は上記課題を解決するために鋭意研究を行った結果、特定の色相を有するライナー原紙に、特定の顔料を有する塗料を塗工することによって課題が解決されることを見出した。即ちＬ＊ａ＊ｂ＊表色系（ＣＩＥ１９７６）によって表されるＬ＊、ａ＊、ｂ＊値がそれぞれ、５５〜９０、−２〜８、０〜５０の範囲にある２層以上を抄き合せたライナー原紙の片面に顔料と接着剤を主成分とする塗工層を有する塗工ライナーにおいて、該塗工層に、顔料１００質量部当たり焼成カオリンを６０〜９５質量部、タルクを５〜４０質量部含有していることを特徴とする。
前記塗工層は、焼成カオリンを含有する塗料が少なくとも１層以上塗工されており、その全塗工量が乾燥重量で２〜１０ｇ／ｍ2であることが好ましい。
前記塗料中にカルボキシメチルセルロースのナトリウム塩、ヒドロキシエチルセルロース、合成保水剤、ポリビニルアルコールからなる群より選ばれた少なくとも１種類を含有していることが好ましい。
前記塗工層に、顔料１００質量部に対し、接着剤を１０〜５０質量部含有していることが好ましい。
塗工後のライナーの白色度が４５〜８０％、Ｌ＊ａ＊ｂ＊表色系（ＣＩＥ１９７６）によって表されるＬ＊、ａ＊、ｂ＊値がそれぞれ７５〜９５、−１〜３、−２〜５で、かつＣ＊値が５以下あるとさらに好ましい。
As a result of intensive studies to solve the above problems, the present inventors have found that the problem can be solved by applying a paint having a specific pigment to a liner base paper having a specific hue. That is, two or more layers having L * , a * and b * values represented by the L * a * b * color system (CIE 1976) in the range of 55 to 90, −2 to 8, and 0 to 50, respectively, are made. In a coated liner having a coating layer mainly composed of a pigment and an adhesive on one side of the bonded liner paper, 60 to 95 parts by weight of calcined kaolin and 100% by weight of talc are added to the coating layer. It is characterized by containing ~ 40 parts by mass .
The coating layer is preferably coated with at least one layer of baked kaolin-containing paint, and the total coating amount is preferably 2 to 10 g / m 2 in terms of dry weight.
It is preferable that the coating material contains at least one selected from the group consisting of sodium salt of carboxymethyl cellulose, hydroxyethyl cellulose, synthetic water retention agent, and polyvinyl alcohol.
It is preferable that 10-50 mass parts of adhesive agents are contained in the coating layer with respect to 100 mass parts of the pigment.
The whiteness of the liner after coating is 45 to 80%, and the L * , a * and b * values represented by the L * a * b * color system (CIE1976) are 75 to 95, −1 to 3, respectively. More preferably, it is −2 to 5 and the C * value is 5 or less.
本発明によって、目視で十分な白さを有し、フレキソ印刷におけるインキ発色性に優れ、印刷均一性が良好なライナーおよびそれを用いた段ボールを提供することが可能となった。 According to the present invention, it has become possible to provide a liner having sufficient whiteness by visual inspection, excellent in ink color development in flexographic printing, and excellent in printing uniformity, and a corrugated cardboard using the liner.
一般に、フレキソ印刷は水性タイプのインキを使用して印刷が実施されることから、印刷面の吸水性度合いによりインキの浸み込みが異なり、インキの発色性、印刷均一性および網点再現性に大いに影響する。このため、吸水性およびインキのビヒクルを抑制するために適正な顔料を含む塗工層を設けることにある。フレキソ印刷に求められる吸水性の特性を共に満足させる検討を重ねた結果、塗工層に全顔料１００質量部当たり、焼成カオリンを６０〜１００重量部含有することにより、極めて発色性の優れ、印刷均一性および網点再現性のある印刷効果が得られることを見出した。
In general, flexographic printing is performed using water-based inks, so the ink penetration varies depending on the degree of water absorption on the printed surface, resulting in ink color development, printing uniformity and halftone dot reproducibility. It greatly affects. For this reason , an object is to provide a coating layer containing an appropriate pigment in order to suppress water absorption and ink vehicle. As a result of repeated studies to satisfy both the water-absorbing characteristics required for flexographic printing, the coating layer contains 60 to 100 parts by weight of calcined kaolin per 100 parts by weight of the total pigment, so that the color development is extremely excellent. It has been found that a printing effect with uniformity and halftone dot reproducibility can be obtained.
上記の塗工層構成が、フレキソ印刷適性を改善する理由は必ずしも定かではないが、焼成カオリンは、天然に産するカオリンをキルンなどで約８００℃程度の高温処理することにより、カオリンの結晶構造中に存在する結晶水を放出させたもので、結晶構造が崩壊して非晶質な構造となり、不透明性、多孔質でインキ吸収性に優れた性質を持っている。このことから、焼成カオリンのもつ空隙性によって、顔料中にインキを取り込み、またインキ中の溶剤が均一に吸収されて、インキの発色性と均一性が得られ、また密着性の向上による網点の再現性も得られるものと考える。このため、本発明において、Ｌ＊ａ＊ｂ＊表示系で表されるＬ＊、ａ＊、ｂ＊値としてそれぞれ、５５〜９０、−２〜８、０〜５０の範囲にあるライナー原紙に塗工する塗料に使用される全顔料１００質量部当たり、焼成カオリンを６０〜１００質量部含有すると、目視で十分な白さを保ち、且つ、水性フレキソ印刷において優れたインキ発色性と印刷均一性を得ることが出来る。含有量が７０質量部以上であればより好ましい。因みに、焼成カオリンの含有量が６０質量部未満であれば塗工した後のライナー表面が目視で十分な白さを保てず、フレキソ印刷におけるインキ発色性、印刷均一性が得られない。 The reason why the above-mentioned coating layer structure improves the flexographic printing suitability is not necessarily clear, but calcined kaolin is obtained by treating kaolin produced in nature with a kiln or the like at a high temperature of about 800 ° C. The crystal water that is present inside is released, the crystal structure collapses to an amorphous structure, and is opaque, porous, and has excellent ink absorbability. From this, the porosity of the calcined kaolin allows the ink to be taken into the pigment, and the solvent in the ink is absorbed uniformly, resulting in ink color development and uniformity, and a halftone dot due to improved adhesion. It is considered that reproducibility can be obtained. Therefore, in the present invention, the liner base paper in the range of 55 to 90, −2 to 8, and 0 to 50 as L * , a * , and b * values represented by the L * a * b * display system, respectively. When 60 to 100 parts by mass of calcined kaolin is contained per 100 parts by mass of the total pigment used in the coating material to be applied, sufficient whiteness is visually observed, and excellent ink color development and printing uniformity in aqueous flexographic printing Can be obtained. The content is more preferably 70 parts by mass or more. Incidentally, if the content of the calcined kaolin is less than 60 parts by mass, the liner surface after coating cannot maintain a sufficient whiteness visually, and ink color development and printing uniformity in flexographic printing cannot be obtained.
本発明において、焼成カオリンを含有する塗料の塗工層は、単層であっても、複層であっても差し支えないが、全体の塗工量は２〜１０ｇ／ｍ2が好ましい。塗工量がこの範囲であると、経済性にすぐれ、且つ水性フレキソのインキ発色性が優れたライナーが得られる。より好ましい塗工量としては、３〜７ｇ／ｍ2ある。 In the present invention, the coating layer of the paint containing the calcined kaolin may be a single layer or a multilayer, but the total coating amount is preferably 2 to 10 g / m 2 . When the coating amount is within this range, it is possible to obtain a liner which is excellent in economic efficiency and excellent in water-based flexo ink color development. A more preferable coating amount is 3 to 7 g / m 2 .
ライナー原紙表層に塗工する塗料の顔料で焼成カオリン以外の顔料としては、製紙分野で通常使用されている顔料、例えば、クレー、構造化カオリン、エンジニアードカオリン、水酸化アルミニウム、二酸化チタン、軽質炭酸カルシウム、重質炭酸カルシウム、硫酸バリウム、酸化亜鉛、サチンホワイト、硫酸カルシウム、タルク等の一種または二種以上を使用することができる。特に本発明はタルクを使用する。その理由として、段ボール製造時においてライナー表面に異物が接触して擦れた時、ライナー表面の摩擦抵抗が高いとライナー表面に異物付着による汚れが発生しやすいことに対して、タルクが扁平顔料で、塗工層に存在すると摩擦抵抗を低減させる性質を有していることから、異物による汚れを軽減させるためである。一般的に製紙用のタルクは、セディグラフによって測定した平均粒径が１〜５μｍ、クロライト含有率は０〜９０％であるが、中でもクロライト含有率５〜５０％のタルクの使用は、顔料の分散性と加工時の汚れを軽減させる効果のバランスがとれているため、より好ましい。また、タルク配合部数は顔料１００質量部当たり５〜４０質量部が好ましい。クロライト含有率によりタルク配合部数は変わるものの、さらに好ましくは１５〜４０質量部である。ここで、タルクを配合した場合の焼成カオリンの配合部数としては、６０〜９５質量部、より好ましくは６０〜８５質量部である。なお、焼成カオリンおよび、タルクを除く顔料は、フレキソインキの吸収性の観点から、本発明の所望する効果を阻害しない範囲で使用するのが望ましいが、プラスチックピグメント等の有機顔料はインキ吸収性が劣るので好ましくない。 Examples of pigments other than calcined kaolin, which are paint pigments coated on the surface of liner liner paper, are usually used in the papermaking field, such as clay, structured kaolin, engineered kaolin, aluminum hydroxide, titanium dioxide, light carbonic acid. One or more of calcium, heavy calcium carbonate, barium sulfate, zinc oxide, satin white, calcium sulfate, talc and the like can be used. In particular, the present invention uses talc. The reason for this is that when foreign material comes into contact with the liner surface during the corrugated cardboard and rubs, if the frictional resistance of the liner surface is high, dirt due to foreign matter adhesion tends to occur on the liner surface, whereas talc is a flat pigment, This is to reduce contamination due to foreign matter because it has the property of reducing frictional resistance when present in the coating layer. Generally, talc for papermaking has an average particle size of 1 to 5 μm measured by sedigraph and a chlorite content of 0 to 90%. Among them, the use of talc with a chlorite content of 5 to 50% is This is more preferable because the balance between the dispersibility of the pigment and the effect of reducing dirt during processing is balanced. Moreover, the number of talc blending parts is preferably 5 to 40 parts by mass per 100 parts by mass of the pigment. Although the talc content varies depending on the chlorite content, it is more preferably 15 to 40 parts by mass. Here, as a compounding part number of the baking kaolin at the time of mix | blending a talc, it is 60-95 mass parts, More preferably, it is 60-85 mass parts. In addition, it is desirable to use the pigments excluding calcined kaolin and talc within the range that does not impair the desired effect of the present invention from the viewpoint of the absorbability of the flexographic ink. Since it is inferior, it is not preferable.
さらに、ライナー原紙表層に塗工する塗料に、保水剤を添加すると塗工適性が向上するので好ましい。添加する保水剤としては、製紙分野で一般にＣＭＣと呼ばれているカルボキシメチルセルロースのナトリウム塩、ヒドロキシエチルセルロース、合成保水剤と呼ばれている多価カルボン剤アクリル系共重合体やメタクリル酸とアクリル酸エステルの共重合体等が挙げられる。その中でもカルボキシメチルセルロースのナトリウム塩は、塗工面が均一に塗工されやすく、特にエーテル化度０．６０〜１．００、重合度６００〜１２００の範囲のものが取り扱い性に良好な点で好ましい。 Furthermore, it is preferable to add a water retention agent to the coating material to be coated on the liner base paper surface because the coating suitability is improved. As the water retention agent to be added, sodium salt of carboxymethyl cellulose, which is generally called CMC in the papermaking field, hydroxyethyl cellulose, polyvalent carboxylic acid acrylic copolymer called synthetic water retention agent, methacrylic acid and acrylic ester And the like. Among them, the sodium salt of carboxymethyl cellulose is easily coated uniformly, and those having an etherification degree of 0.60 to 1.00 and a polymerization degree of 600 to 1200 are particularly preferable in terms of good handleability.
本発明の塗料中の接着剤としては、特に限定するものではなく、一般の塗被紙製造分野で使用されている公知の接着剤が適宜使用される。例えば、スチレン−ブタジエン共重合体ラテックス、メチルメタクリレート−ブタジエン共重合体ラテックス、スチレンーメチルメタクリレートーブタジエン共重合体ラテックス等の共役ジエン系共重合体ラテックス、アクリル酸エステルおよび／またはメタクリル酸エステルの重合体または共重合体ラテックス等のアクリル系重合体ラテックス、エチレン−酢酸ビニル重合体ラテックス等のビニル系重合体ラテックス、あるいはこれらの各種重合体ラテックスをカルボキシル基等の官能基含有単量体で変性した重合体または共重合体ラテックス等の水分散性接着剤、ポリビニルアルコール、オレフィン−無水マレイン酸樹脂等の合成樹脂系接着剤、酸化澱粉、両性澱粉、エステル化澱粉、デキストリン等の澱粉類が例示される。これら水分散性および／または水溶性接着剤から１種または２種以上を適宜選択して使用できる。接着剤の配合部数は顔料１００質量部に対して、１０〜５０質量部の接着剤の使用が好ましい。さらに好ましくは１５〜４０質量部である。因みに、接着剤の含有量が１０質量部未満であれば塗工層の強度が保てない。また、５０質量部を超えると、塗工層中における顔料の比率が小さくなるため、塗工後のライナー表面が目視で十分な白さを保つことができず、また、フレキソ印刷におけるインキ発色性あるいは印刷均一性若しくはその両方が劣る。
The adhesive in the paint of the present invention is not particularly limited, and a known adhesive used in the general coated paper manufacturing field is appropriately used. For example, styrene-butadiene copolymer latex, methyl methacrylate-butadiene copolymer latex, conjugated diene copolymer latex such as styrene-methyl methacrylate-butadiene copolymer latex, acrylic ester and / or methacrylate ester Acrylic polymer latex such as a polymer or copolymer latex, vinyl polymer latex such as ethylene-vinyl acetate polymer latex, or these various polymer latexes were modified with a functional group-containing monomer such as a carboxyl group. Examples include water-dispersible adhesives such as polymer or copolymer latex, synthetic resin adhesives such as polyvinyl alcohol and olefin-maleic anhydride resins, and starches such as oxidized starch, amphoteric starch, esterified starch, and dextrin. The One or more of these water-dispersible and / or water-soluble adhesives can be appropriately selected and used. It is preferable to use 10 to 50 parts by mass of the adhesive with respect to 100 parts by mass of the pigment. More preferably, it is 15-40 mass parts. Incidentally, if the content of the adhesive is less than 10 parts by mass, the strength of the coating layer cannot be maintained. On the other hand, when the amount exceeds 50 parts by mass, the ratio of the pigment in the coating layer becomes small, so that the liner surface after coating cannot be kept visually white enough, and ink color development in flexographic printing. Or printing uniformity or both are inferior.
また、インキ発色性向上、印刷均一性の仕上がりに関しての効果を阻害しない範囲において、本発明で使用される塗料中に、表面サイズ剤、防滑剤、染料等の添加剤を併用してもよい。
Further, the ink coloring properties improved, within the range not impairing the effects of the terms printed uniformity of the finished, in the paint used in the present invention, surface sizing agents, anti-lubricant, it may be used in combination additives such as a dye.
本発明の塗料をライナー原紙に塗工するに当たっては、塗被紙製造に一般に使用される塗工装置が使用でき、例えば、ブレードコーター、エアーナイフコーター、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、グラビアコーター、チャンプレックスコーター、２ロールサイズプレスコーター、ゲートロールサイズプレスコーター、フィルムメタリングサイズプレスコーター等の塗工装置を使用して、オンマシン方式またはオフマシン方式でライナー原紙の表面に、単層または多層で塗工される。塗工時の顔料組成物の固形分濃度は、１０〜７５重量％の範囲で選ぶことができるが、塗工量が２〜１０ｇ／ｍ2の範囲に留まるよう、また、塗工するコーターを考慮し、適宜調整することが好ましい。 When coating the paint of the present invention on the liner base paper, a coating device generally used for coated paper production can be used, for example, blade coater, air knife coater, roll coater, reverse roll coater, bar coater, curtain. On-machine or off-machine liners using coating equipment such as coaters, die slot coaters, gravure coaters, chaplex coaters, 2 roll size press coaters, gate roll size press coaters, film metallizing size press coaters, etc. The base paper is coated with a single layer or multiple layers. The solid content concentration of the pigment composition at the time of coating can be selected in the range of 10 to 75% by weight, but the coater to be coated should be applied so that the coating amount remains in the range of 2 to 10 g / m 2. It is preferable to adjust appropriately in consideration.
本発明で塗工された塗工ライナーは、塗工面や印刷適性をさらに向上させるために、弾性ロールにコットンロールを用いたスーパーカレンダーや弾性ロールに合成樹脂ロールを用いたソフトニップ等のカレンダー装置により平滑化処理を行うことが出来る。ソフトニップカレンダーは合成樹脂ロール表面の耐熱温度がコットンロールに比べて高く設定することが可能なため、高温での処理が可能であり、同一の平滑性を目標とした場合、スーパーカレンダーに比べて処理線圧を低く設定できるので好ましい態様である。 In order to further improve the coating surface and printability, the coating liner coated in the present invention is a calender device such as a super calender using a cotton roll as an elastic roll and a soft nip using a synthetic resin roll as an elastic roll. The smoothing process can be performed. The soft nip calender can set the heat-resistant temperature on the surface of the synthetic resin roll higher than that of the cotton roll, so it can be processed at high temperatures, and compared with the super calender when the same smoothness is targeted. This is a preferred embodiment because the treatment linear pressure can be set low.
本発明で使用されるライナー原紙については、構成するパルプとしては特に限定するものではなく、例えば木材パルプである未晒、晒の化学パルプ、機械パルプ、非木材パルプ及び雑誌古紙、チラシ古紙、新聞古紙、オフィス古紙、情報用紙古紙、段ボール古紙、紙器古紙等の古紙パルプ、マニラ麻等のパルプを一種、又は二種以上を適宜混合して使用される。強度等を考慮するとクラフトパルプ、段ボール古紙を使用することが好ましい。本発明においては、資源保護、強度バランスおよびコストの観点から、表層に段ボール古紙を７０重量％以上配合することが好ましい態様である。 The liner base paper used in the present invention is not particularly limited as a constituent pulp. For example, unbleached, bleached chemical pulp, mechanical pulp, non-wood pulp, magazine waste paper, leaflet waste paper, newspaper, which is wood pulp, is used. Used waste paper, office waste paper, information paper waste paper, corrugated waste paper, waste paper pulp such as paperboard waste paper, pulp of manila hemp, etc., or a mixture of two or more kinds as appropriate. Considering the strength and the like, it is preferable to use kraft pulp and used corrugated paper. In the present invention, from the viewpoint of resource protection, strength balance, and cost, it is a preferred embodiment that 70% by weight or more of corrugated used paper is blended in the surface layer.
内添薬品も必要に応じて使用でき、例えば、硫酸バンド、ロジン等のサイズ剤、ポリアミド、澱粉等の紙力増強剤、濾水歩留まり向上剤、ポリアミドポリアミンエピクロヒドリン等の耐水化剤、染料等が使用される。例示したパルプ、内添薬品を使用し、二層以上のパルプ層を抄き合わせて多層構成とした原紙を使用する。 Internally added chemicals can also be used as necessary, for example, sizing agents such as sulfuric acid bands and rosins, paper strength enhancers such as polyamide and starch, drainage yield improvers, water resistance agents such as polyamide polyamine epichlorohydrin, Dyes are used. The illustrated pulp and internal chemicals are used, and a base paper having a multilayer structure formed by combining two or more pulp layers is used.
本発明のライナー原紙は、二層以上のパルプ層を抄き合わせて多層構成とするものであるが、公知の多層抄き抄紙機によって製造することができる。製造されたライナー原紙としては、Ｌ＊ａ＊ｂ＊表色系（ＣＩＥ：１９７６）によって表されるＬ＊、ａ＊、ｂ＊値がそれぞれ５５〜９０、−２〜８、０〜５０の範囲に調整し、塗工後のライナーが、白色度として４５〜８０％、Ｌ＊ａ＊ｂ＊表色系（ＣＩＥ１９７６）によって表されるＬ＊値が７５〜９５、ａ＊値が−１〜３、ｂ＊値が−２〜５、より好ましくは０〜３で、かつＣ＊が５以下、より好ましくは３以下となる範囲にあればコントラストのあるライナーとして仕上げることができ好ましい。ここで、Ｃ＊は彩度を示す指標で、Ｃ＊＝[(ａ＊)２＋（ｂ＊）２]１／２から求められる。 The liner base paper of the present invention has a multilayer structure formed by combining two or more pulp layers, and can be produced by a known multilayer paper machine. The produced liner base paper has L * , a * , b * values represented by the L * a * b * color system (CIE: 1976) of 55 to 90, −2 to 8, and 0 to 50, respectively. The liner after coating was adjusted to a range of 45 to 80% in terms of whiteness, the L * value represented by the L * a * b * color system (CIE1976) was 75 to 95, and the a * value was −1. -3, b * value is -2 to 5, more preferably 0 to 3, and C * is 5 or less, more preferably 3 or less, it can be finished as a contrasting liner. Here, C * is an index indicating saturation and is obtained from C * = [(a * ) 2 + (b * ) 2 ] 1/2 .
ここで、ライナー原紙表面の白色度については、５〜８０％の範囲で本発明に適用される。原紙の白色度が高ければ高いほど、塗工後の目視白さが向上し、フレキソ印刷の有り無しの部分のコントラストが大きくなるので印刷仕上がりが向上するが、原紙の白色度を上げるには、使用するパルプを白くする必要があり、経済的な負担が増える。印刷仕上がりと経済性のバランスを考慮すると、原紙白色度は１０〜４０％の範囲が好ましい。なお、塗工する原紙の表層には、塗料の染み込みを抑えるため、サイズ剤を添加することが望ましい。 Here, the whiteness of the liner base paper surface is applied to the present invention in the range of 5 to 80%. The higher the whiteness of the base paper, the better the visual whiteness after coating and the greater the contrast of the part with or without flexo printing, so the print finish improves, but to increase the whiteness of the base paper, It is necessary to whiten the pulp to be used, increasing the economic burden. Considering the balance between printing finish and economy, the base paper whiteness is preferably in the range of 10 to 40%. In addition, it is desirable to add a sizing agent to the surface layer of the base paper to be coated in order to suppress the penetration of the paint.
本発明の塗工ライナー上に印刷する際のフレキソインキとしては、特に制限はなく、アルコール型、コソルベント型、水性型、およびＵＶ硬化型等があげられるが、これらのフレキソインキの中でも水性型が安全性、作業性及び経済性の面でも優れており、本発明の効果が最も顕著に表れる実施態様である。 The flexographic ink for printing on the coating liner of the present invention is not particularly limited, and examples thereof include an alcohol type, a cosolvent type, an aqueous type, and a UV curable type. Among these flexographic inks, an aqueous type is also included. However, it is also excellent in safety, workability, and economical efficiency, and is an embodiment in which the effects of the present invention are most prominent.
また使用されるフレキソ印刷機は、印刷ユニットの並び方により、スタック型、ライン型、セントラルインプレッション型の３タイプに分けられるが、いずれのタイプも使用できる。 Also, the flexographic printing press used is classified into three types, stack type, line type, and central impression type, depending on the arrangement of printing units, but any type can be used.
上記の本発明により得られた塗工ライナーは、少なくとも一方の最外面に備えた段ボール用ライナーとして用いることができ、本発明の段ボールが提供される。段ボールとしては、中芯の片面にのみライナーが貼合された片面段ボール、中芯の両面にライナーが貼合された両面段ボール、中芯／ライナーの積層体が複数段設けられた複数段の段ボールがあるが、本発明はいずれの段ボールにも適用可能である。 The coated liner obtained by the present invention can be used as a cardboard liner provided on at least one outermost surface, and the cardboard of the present invention is provided. Corrugated cardboard includes single-sided cardboard with a liner bonded to only one side of the core, double-sided cardboard with liners bonded to both sides of the core, and multiple-level cardboard with multiple layers of core / liner laminates However, the present invention is applicable to any cardboard.
ライナーと共に段ボールを構成する波状部材の中芯としては特に制限はなく、一般の段ボールに使用されているものが使用できる。原料パルプとしては、セミケミカルパルプ（ＳＣＰ）、ケミグラウンドパルプ（ＣＧＰ）、段ボール古紙パルプ、雑誌古紙パルプ、未晒クラフトパルプ、クラフトパルプ、合成繊維等が使用でき、中でも、資源保護の観点から、段ボール古紙パルプや雑誌古紙パルプ等の古紙パルプを多く用いることが好ましい。中芯は積層紙であっても良く、さらには層間に合成樹脂接着剤層を有する積層紙であっても良い。 There is no restriction | limiting in particular as a core of the corrugated member which comprises a cardboard with a liner, The thing currently used for the general cardboard can be used. As raw material pulp, semi-chemical pulp (SCP), Chemi-ground pulp (CGP), corrugated waste paper pulp, magazine waste paper pulp, unbleached kraft pulp, kraft pulp, synthetic fiber, etc. can be used. It is preferable to use a lot of waste paper pulp such as corrugated waste paper pulp and magazine waste paper pulp. The core may be a laminated paper, and may further be a laminated paper having a synthetic resin adhesive layer between layers.
本発明の段ボールは、従来公知の段ボールの製造方法をそのまま適用でき、例えば、中芯とライナーとを、接着性物質を介して貼合するコルゲーター処理を経て製造することができる。接着性物質としては、澱粉糊や合成樹脂（ポリエチレン、ポリプロピレン、ポリアミド、ポリエステル、エチレン−不飽和カルボン酸共重合体、スチレン−ブタジエン共重合体、ブタジエン−アクリロニトリル共重合体、スチレン−ブタジエン−アクリロニトリル共重合体、ポリ酢酸ビニル、エチレン−酢酸ビニル共重合体、ポリアクリル酸エステル系共重合体、スチレン−アクリル酸エステル共重合体等）等が挙げられる。 The corrugated board of the present invention can be produced by applying a conventionally known corrugated board production method as it is, for example, through a corrugator treatment in which a core and a liner are bonded through an adhesive substance. Adhesive materials include starch paste and synthetic resins (polyethylene, polypropylene, polyamide, polyester, ethylene-unsaturated carboxylic acid copolymer, styrene-butadiene copolymer, butadiene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer). Polymer, polyvinyl acetate, ethylene-vinyl acetate copolymer, polyacrylate copolymer, styrene-acrylate copolymer, etc.).
具体的には、（１）中芯又はライナーの表面に、押出ラミネートや合成樹脂エマルジョンの塗布等により接着剤層を形成してから、これらを重ね合わせ、加圧及び加熱して接着する方法、（２）中芯／ライナー間に合成樹脂フィルムを介在させ、これを加圧及び加熱して接着する方法、（３）中芯／ライナー間に合成樹脂のエマルジョンや溶液等の接着剤を介在させ、これを加圧及び加熱して接着する方法等が挙げられる。なお、（２）の方法においては、あらかじめ成形された合成樹脂フィルムを繰り出し、中芯／ライナー間に供給することもできるし、合成樹脂フィルムを溶融押出成形しながら、中芯／ライナー間に供給することもできる。 Specifically, (1) A method in which an adhesive layer is formed on the surface of the core or liner by extrusion lamination or application of a synthetic resin emulsion, etc., and then these are stacked, pressed and heated to be bonded, (2) A method in which a synthetic resin film is interposed between the core / liner and the pressure is applied to heat the film, and (3) an adhesive such as a synthetic resin emulsion or solution is interposed between the core / liner. And a method of applying pressure and heating to bond them. In the method (2), a pre-molded synthetic resin film can be fed out and supplied between the core and the liner, or the synthetic resin film can be supplied between the core and the liner while being melt-extruded. You can also
上記コルゲーター処理を１回実施することで、片面段ボールが製造され、複数回繰り返し実施することで、両面段ボールや複数段の段ボールが製造される。両面段ボールは、例えば、中芯とライナーとを加熱加圧ロールで貼合し片面段ボールとするシングルフェーサ（ＳＦ）と、ＳＦで得られた片面段ボールの中芯側に更にライナーを重ね、加圧しながら熱盤上を走行させ貼合するダブルフェーサ（ＤＦ）とを有するコルゲーターを用いて製造することができる。加熱加圧条件は特に制限はないが、例えば、ＳＦの加熱温度１５０〜２００℃、線圧２０〜４０ｋＮ／ｍ、加圧時間０．０１〜０．２０秒、ＤＦの加熱温度１５０〜２００℃、線圧０．１〜１．０ｋＮ／ｍ、加圧時間２〜７秒等が好ましい。 A single-sided cardboard is manufactured by performing the corrugator process once, and a double-sided cardboard or a multi-stage cardboard is manufactured by repeatedly performing the process multiple times. Double-sided cardboard, for example, is a single facer (SF) in which a core and a liner are bonded with a heat and pressure roll to form a single-sided cardboard, and a liner is further stacked on the core side of the single-sided cardboard obtained by SF. It can manufacture using the corrugator which has the double facer (DF) which runs on a hot plate | board and presses it while pressing. The heating and pressing conditions are not particularly limited. For example, the heating temperature of SF is 150 to 200 ° C., the linear pressure is 20 to 40 kN / m, the pressing time is 0.01 to 0.20 seconds, and the heating temperature of DF is 150 to 200 ° C. A linear pressure of 0.1 to 1.0 kN / m, a pressurization time of 2 to 7 seconds, and the like are preferable.
以下に、実施例を挙げて本発明をより具体的に説明するが、勿論、本発明はそれらの範囲に限定されるものでない。なお、例中の「部」、「％」は特に断わらない限り、質量部、質量％を示す。 Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these ranges. In the examples, “parts” and “%” indicate parts by mass and mass% unless otherwise specified.
比較例１
表面層、表下層、中層、裏下層、裏面層に段ボール古紙を使用して５層に抄き合せ、表面層には染料を添加し、米坪１７０ｇ／ｍ2のライナー原紙を得た。得られた表面層のＬ＊、ａ＊、ｂ＊、白色度は、それぞれ、６０．１、５．８、２６．１、１４．８％であった。
Comparative Example 1
Corrugated cardboard was used for the surface layer, front surface lower layer, middle layer, back lower layer, and back surface layer, and the paper layers were combined into 5 layers. A dye was added to the surface layer to obtain a liner base paper having a weight of 170 g / m 2 . L * , a * , b * , and whiteness of the obtained surface layer were 60.1, 5.8, 26.1, and 14.8%, respectively.
焼成カオリン（商品名：アンシレックス、ＢＡＳＦ社製）１００部に対して、接着剤（商品名：Ｂ−１５３５、旭化成社製）を２５部、保水剤（商品名：Ａ７０５５、東亜合成社製）０．５部（いずれも固形分換算）からなる塗工液を、濃度２５％となるよう調製した。調製した塗料を上記の１７０ｇ／ｍ2のライナー原紙にバーコーターで乾燥重量が３.５ｇ／ｍ2（固形分）となるように塗工、乾燥後、１Ｎｉｐのカレンダー処理をして塗工ライナーを得た。 To 100 parts of calcined kaolin (trade name: Ancilex, manufactured by BASF), 25 parts of adhesive (trade name: B-1535, manufactured by Asahi Kasei), water retention agent (trade name: A7055, manufactured by Toagosei Co., Ltd.) A coating liquid consisting of 0.5 parts (all in terms of solid content) was prepared to a concentration of 25%. The prepared paint is coated on the above-mentioned 170 g / m 2 liner base paper with a bar coater so that the dry weight becomes 3.5 g / m 2 (solid content), dried, and then subjected to 1 Nip calendering and coated liner Got.
比較例２
比較例１において、表面層にＮ材の未晒クラフトパルプ１０％、脱墨パルプ１５％、段ボール古紙７５％、表下層にＮ材の未晒クラフトパルプ１０％、段ボール古紙９０％、中層、裏下層、裏面層にＮ材の未晒クラフトパルプ２０％、段ボール古紙８０％を使用して５層に抄き合せ、表面層には染料を添加し、米坪１７０ｇ／ｍ2のライナー原紙を得た。得られたライナー原紙表面層のＬ＊、ａ＊、ｂ＊および白色度がそれぞれ、６６．３、−０．６、３７．３、１４．４％であった以外は比較例１と同様な方法で塗工ライナーを得た。
Comparative Example 2
In Comparative Example 1, N material unbleached kraft pulp 10%, deinked pulp 15%, cardboard waste paper 75%, N material unbleached kraft pulp 10%, cardboard waste paper 90%, middle layer, back Using 5% unbleached kraft pulp of N material for the lower and back layers and 80% used corrugated cardboard, they are combined into 5 layers, and a dye is added to the surface layer to obtain a liner base paper of 170 g / m 2 It was. The same as in Comparative Example 1 except that the obtained liner base paper surface layer had L * , a * , b * and whiteness of 66.3, -0.6, 37.3, and 14.4%, respectively. A coated liner was obtained by the method.
比較例３
比較例１において、表面層にＮ材の未晒クラフトパルプ３０％、脱墨パルプ７０％、表下層、中層、裏下層および裏面層に段ボール古紙１００％を使用して５層に抄き合せされ、表面層には染料を添加して、米坪１７０ｇ／ｍ2のライナー原紙を得た。得られたライナー原紙表面層のＬ＊、ａ＊、ｂ＊および白色度がそれぞれ、７２．８、２．１、１６．０、３２．３％に調整した以外は比較例１と同様な方法で塗工ライナーを得た。
Comparative Example 3
In Comparative Example 1, 30% unbleached kraft pulp of N material, 70% deinked pulp for the surface layer, and 100% of used corrugated paper for the lower layer, middle layer, back layer, and back layer are combined into 5 layers. A dye was added to the surface layer to obtain a liner base paper having a weight of 170 g / m 2 . The same method as in Comparative Example 1 except that the L * , a * , b * and whiteness of the obtained liner base paper surface layer were adjusted to 72.8, 2.1, 16.0 and 32.3%, respectively. A coating liner was obtained.
比較例４
比較例１において、表面層にＮ材の晒クラフトパルプ２０％、脱墨パルプ８０％、表下層にマニラパルプ１００％、中層、裏下層および裏面層に新聞古紙２５％、雑誌古紙３７％、段ボール古紙３８％を使用して５層に抄き合せた米坪１７０ｇ／ｍ2のライナー原紙を得た。得られたライナーの表面層のＬ＊、ａ＊、ｂ＊、白色度がそれぞれ、８８．３、−０．４、１．３、７１．４％であった。
Comparative Example 4
In Comparative Example 1, 20% bleached kraft pulp of N material, 80% deinked pulp for the surface layer, 100% Manila pulp for the front and lower layers, 25% used newspaper for the middle layer, back layer and back layer, 37% used magazine paper, cardboard A liner base paper having a basis weight of 170 g / m 2 was obtained by making 38 layers of waste paper into 5 layers. L * , a * , b * , and whiteness of the surface layer of the obtained liner were 88.3, −0.4, 1.3, and 71.4%, respectively.
焼成カオリン（商品名：アンシレックス、前出）８０部、軽質炭酸カルシウム（商品名：ＴＰ１２１、奥多摩工業社製）２０部、接着剤（商品名：Ｂ−１５３５、前出）を２５部、カルボキシメチルセルロース（商品名：ＢＳＨ、第一工業製薬社製）０．５部（いずれも固形分換算）からなる塗工液を、濃度３０％となるよう調製した。調製した塗料を上記のライナー原紙にバーコーターで乾燥重量が５．０ｇ／ｍ2となるように塗工、乾燥後、１Ｎｉｐのカレンダー処理をして、塗工ライナーを得た。 Baked kaolin (trade name: Ancilex, supra) 80 parts, light calcium carbonate (trade name: TP121, manufactured by Okutama Kogyo Co., Ltd.) 20 parts, adhesive (trade name: B-1535, supra) 25 parts, carboxy A coating solution consisting of 0.5 parts of methylcellulose (trade name: BSH, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) (all in terms of solid content) was prepared to a concentration of 30%. The prepared paint was coated on the liner base paper with a bar coater so that the dry weight was 5.0 g / m 2 , dried, and then subjected to 1Nip calendering to obtain a coated liner.
実施例１
焼成カオリン（商品名：アンシレックス、前出）７０部、二酸化チタン（商品名：ＫＡ−１００ ＣＯＳＭＯ ＣＨＥＭＩＣＡＬ社製）２０部、タルク（商品名：ＮＫ−ＰＣＷ、兼松ケミカル社製）１０部、接着剤（商品名：Ｂ−１５３５、前出）２５部、カルボキシメチルセルロース（商品名：ＢＳＨ、前出）０．５部（いずれも固形分換算）からなる塗工液を、濃度３０％となるよう調製した。調製した塗料を比較例１のライナー原紙にバーコーターで５．０ｇ／ｍ2となるように塗工、乾燥後、１Ｎｉｐのカレンダー処理をして塗工ライナーを得た。
Example 1
Baked kaolin (trade name: Ansilex, supra) 70 parts, titanium dioxide (trade name: KA-100 manufactured by COSMO CHEMICAL) 20 parts, talc (trade name: NK-PCW, manufactured by Kanematsu Chemical Co.) 10 parts, adhesion Coating solution consisting of 25 parts of an agent (trade name: B-1535, supra) and 0.5 part of carboxymethylcellulose (trade name: BSH, supra) (all in terms of solid content) so that the concentration is 30%. Prepared. The prepared paint was coated on the liner base paper of Comparative Example 1 with a bar coater so as to be 5.0 g / m 2 , dried, and then subjected to 1Nip calendar treatment to obtain a coated liner.
実施例２
焼成カオリン（商品名：アンシレックス、前出）６０部、二酸化チタン（商品名：ＫＡ−１００、前出）１０部、タルク（商品名：ＮＫ−ＫＣＬ、兼松ケミカル社製）３０部、接着剤（商品名：Ｂ−１５３５、前出）２５部、カルボキシメチルセルロース（商品名：ＢＳＨ、前出）０．９５部（いずれも固形分換算）からなる塗工液を、濃度３０％となるように調整した。調製した塗料を、比較例４のライナー原紙にバーコーターで５．０ｇ／ｍ２となるように塗工、乾燥後、１Ｎｉｐのカレンダー処理をして塗工ライナーを得た。
Example 2
Baked kaolin (trade name: Ancilex, supra) 60 parts, titanium dioxide (trade name: KA-100, supra) 10 parts, talc (trade name: NK-KCL, manufactured by Kanematsu Chemical) 30 parts, adhesive (Product name: B-1535, supra) 25 parts, carboxymethylcellulose (trade name: BSH, supra) 0.95 parts (all in terms of solid content), so that the concentration is 30%. It was adjusted. The prepared coating material was coated on the liner base paper of Comparative Example 4 with a bar coater so as to be 5.0 g / m 2 , dried, and then subjected to 1Nip calendar treatment to obtain a coated liner.
比較例５
比較例１で使用したライナー原紙を塗工せず、非塗工ライナーとして得た。
Comparative Example 5
The liner base paper used in Comparative Example 1 was not coated and was obtained as a non-coated liner.
比較例６
比較例４で使用したライナー原紙を塗工せず、非塗工ライナーとして得た。
Comparative Example 6
The liner base paper used in Comparative Example 4 was not coated and was obtained as a non-coated liner.
比較例７
比較例１において、焼成カオリン（商品名：アンシレックス、前出）４０部、重質炭酸カルシウム（商品名：ＦＭＴ９０、ファイマテック社製）６０部、保水剤（商品名：Ａ７０５５、東亜合成社製）０．６部（いずれも固形分換算）からなる塗工液を、濃度２５％となるよう調製した以外は、比較例１と同様にして塗工ライナーを得た。
Comparative Example 7
In Comparative Example 1, 40 parts of calcined kaolin (trade name: Ancilex, supra), 60 parts of heavy calcium carbonate (trade name: FMT90, manufactured by Pimatech), water retention agent (trade name: A7055, manufactured by Toagosei Co., Ltd.) ) A coating liner was obtained in the same manner as in Comparative Example 1 except that a coating liquid consisting of 0.6 parts (both in terms of solid content) was prepared to a concentration of 25%.
比較例８
比較例１において、２級カオリン（商品名：ＨＴ−ＧＡＳ、ＢＡＳＦ社製）１００部、塗工量を５．２ｇ／ｍ２とした以外は、比較例１と同様にして塗工ライナーを得た。
Comparative Example 8
In Comparative Example 1, a coated liner was obtained in the same manner as in Comparative Example 1, except that 100 parts of secondary kaolin (trade name: HT-GAS, manufactured by BASF) and the coating amount were 5.2 g / m 2. It was.
得られた塗工ライナーについて、下記の評価方法で評価を行い、得られた結果を表１、２に示した。表１は塗工前後の評価結果を示し、表２はフレキソ印刷評価結果を示した。なお、本発明における印刷ライナーの測定及び評価については特に記載のない限り、２３℃、５０％ＲＨの環境下で行った。 About the obtained coating liner, it evaluated by the following evaluation method and the obtained result was shown to Table 1,2. Table 1 shows the evaluation results before and after coating, and Table 2 shows the results of flexographic printing evaluation. The measurement and evaluation of the printing liner in the present invention were performed in an environment of 23 ° C. and 50% RH unless otherwise specified.
（白色度）
白色度は分光白色度測色計（スガ試験機社製）を用い、ＪＩＳ Ｚ ８１４８に準じて求めた。
(Whiteness)
The whiteness was determined according to JIS Z 8148 using a spectral whiteness colorimeter (manufactured by Suga Test Instruments Co., Ltd.).
（塗工ライナーのＬ＊、ａ＊、ｂ＊、Ｃ＊）
Ｌ＊、ａ＊、ｂ＊、Ｃ＊は分光白色度測色計（スガ試験機社製）を用い、ＪＩＳ Ｚ ８７２２に準じて測定し、ＪＩＳ Ｚ ８７２９に準じて表示した。
彩度Ｃ＊＝[(ａ＊)２＋（ｂ＊）２]１／２
(L * , a * , b * , C * of coating liner)
L * , a * , b * , and C * were measured according to JIS Z 8722 using a spectral whiteness colorimeter (manufactured by Suga Test Instruments Co., Ltd.) and displayed according to JIS Z 8729.
Saturation C * = [(a * ) 2 + (b * ) 2 ] 1/2
（目視白さ指標）
分光白色測色計で測定した白色度が４０〜６０％の範囲のとき、その色相によって、目視による白さを感じる認識から乖離することがある。経験上、人間の目は明度７０以上、彩度３以下で白く認識することから、本発明では、目視白さとして、明度７０以上、彩度０〜３を満たしたときに、目視白さが優れており、明度７０未満、彩度３を超える場合はすべて劣るとした。
(Visual whiteness index)
When the whiteness measured with a spectral white colorimeter is in the range of 40 to 60%, the hue may deviate from the perception of whiteness visually. From experience, the human eye recognizes white with a brightness of 70 or more and a saturation of 3 or less. Therefore, in the present invention, when the visual whiteness satisfies a brightness of 70 or more and a saturation of 0 to 3, the visual whiteness is It was considered to be inferior, and in all cases where brightness was less than 70 and saturation 3 was exceeded.
（平滑度）
ＪＩＳ Ｐ８１５１：２００４に準じ、加圧型平滑度計（測定器：パーカープリントサーフ、Ｍｅｓｓｍｅｒ Ｂｕｃｈｅｌ社製）を使用し、加圧条件が０．５ＭＰａ（５ｋｇｆ／ｃｍ２）時の平滑度を測定した。
(Smoothness)
In accordance with JIS P8151: 2004, a pressure type smoothness meter (measuring device: Parker Print Surf, manufactured by Messmer Buchel) was used, and the smoothness when the pressure condition was 0.5 MPa (5 kgf / cm 2 ) was measured.
（摩擦係数）
ＪＩＳ Ｐ８１４７：１９９４に準じ、引張試験機（測定器：オートグラフＡＧＳ−５００ＮＧ、島津製作所社製）を使用して、引張速度が１００ｍｍ／分、おもり１ｋｇで、ライナーの表面同士を擦り合わせた時の動摩擦係数を測定した。
(Coefficient of friction)
According to JIS P8147: 1994, when using a tensile tester (measuring instrument: Autograph AGS-500NG, manufactured by Shimadzu Corporation), the surface of the liner is rubbed together with a tensile speed of 100 mm / min and a weight of 1 kg. The dynamic friction coefficient of was measured.
（フレキソ印刷におけるインキの発色性、均一性）
Ｋ印刷プルーファー（ＲＫ Ｐｒｉｎｔ−Ｃｏａｔ Ｉｎｓｔｒｕｍｅｎｔｓ社製）、１００線／インチに彫刻したアニロックスプレートで、水性フレキソ藍インキ（商品名：アクワコンテＧＮ３９ＳＡ藍、東洋インキ社製）を使用して、得られた塗工ライナーに印刷した。印刷した面をカラー反射濃度計（Ｍｏｄｅｌ４０４Ｇ、Ｘ−Ｒｉｔｅ社製）でシアンインキ濃度を計測した。
フレキソ印刷均一性については、下記の目視評価を行った。
◎：フレキソ印刷面の均一性が優れている。
○：フレキソ印刷面にやや濃淡ムラが見られる。
×：フレキソ印刷面に濃淡ムラが顕著に見られる。
(Color development and uniformity of ink in flexographic printing)
K printing proofer (manufactured by RK Print-Coat Instruments), obtained by using an aqueous flexo indigo ink (trade name: AQUA CONTE GN39SA indigo, manufactured by Toyo Ink) with an anilox plate engraved at 100 lines / inch Printed on the coating liner. The printed surface was measured for cyan ink density with a color reflection densitometer (Model 404G, manufactured by X-Rite).
The following visual evaluation was performed for flexographic printing uniformity.
A: The uniformity of the flexographic printing surface is excellent.
○: Slight unevenness is observed on the flexographic printing surface.
X: Light and shade unevenness is remarkably seen on the flexographic printing surface.
（網点再現性）
印刷局式グラビア印刷試験機（ＪＡＰＡＮ ＴＡＰＰＩ紙パルプ試験方法Ｎｏ２４に準拠）で、インキは水性フレキソインキ（商品名：ＦＫ−９９Ｄ−２６０くろＰＲ−７、サカタインクス社製）を使用して印刷。５０％の階調部を２５倍に拡大し、網点の状態を下記の官能評価で行った。
○：網点の形状が明らかに認められるが、一部欠損がある。
△：網点の形状が認められるが、欠損部が全体の半分以上ある。
×：網点の形状が認められない。
(Halftone dot reproducibility)
Ink is printed using a water-based flexographic ink (trade name: FK-99D-260 Kuro PR-7, manufactured by Sakata Inx Corporation) with a printing station type gravure printing tester (based on JAPAN TAPPI paper pulp test method No. 24). The 50% gradation part was magnified 25 times, and the halftone dot state was subjected to the following sensory evaluation.
○: The shape of the halftone dots is clearly recognized, but there are some defects.
Δ: A halftone dot shape is recognized, but there are more than half of the defects.
X: The shape of a halftone dot is not recognized.
（フレキソ印刷面の色：Ｌ＊、ａ＊、ｂ＊）
上記のフレキソインキの発色性、均一性の評価を行った藍印刷部について、Ｌ＊、ａ＊、ｂ＊を分光白色度測色計（スガ試験機社製）で、ＪＩＳ Ｚ−８７２２に準じて測定。ＪＩＳ Ｚ−８７２９に準じて求めた。
(Flexo printing surface color: L * , a * , b * )
About the indigo printing part which evaluated the color developability and uniformity of said flexo ink, L * , a * , b * are spectral whiteness colorimeters (made by Suga Test Instruments Co., Ltd.) according to JIS Z-8722. Measured. It calculated | required according to JISZ-8729.
（加工時汚れ評価）
得られた塗工ライナーおよび非塗工ライナーをコルゲーターで中芯（商品名：Ｓ１２０、王子板紙社製）と裏ライナー（商品名：ＳＦ２１０、王子板紙社製）を使用して貼合し、Ａフルート形態で段ボールシートを作成した。その後、製函工程を経て段ボールケースを作成した。貼合、製函工程における汚れは下記の基準で官能評価を行った。
○：ライナー表面に異物付着による汚れが全く見られない。
△：ライナー表面に異物付着による汚れがわずかに見られるが、実用上問題ないレベル
である。
×：ライナー表面に異物付着による汚れが著しくみられ、実用上問題があるレベルであ
る。
(Evaluation of dirt during processing)
The obtained coated liner and non-coated liner were bonded with a corrugator using a core (product name: S120, manufactured by Oji Paperboard Co., Ltd.) and a back liner (product name: SF210, manufactured by Oji Paperboard Co., Ltd.). Corrugated sheet was made in the flute form. Thereafter, a cardboard case was prepared through a box making process. The dirt in the bonding and box making process was subjected to sensory evaluation based on the following criteria.
○: No dirt due to adhesion of foreign matter is observed on the liner surface.
Δ: Slight contamination due to adhesion of foreign matter is seen on the liner surface, but at a level where there is no practical problem.
X: Dirt due to adhesion of foreign matter is noticeable on the liner surface, and there is a practical problem.
貼合時における、熱板取られ状況等は、実施例、比較例で得られた塗工および非塗工ライナー共段ボールシートにおいては大差なかったが、得られたシートに果物の図柄を印刷すると、実施例１、２、比較例１〜４の塗工ライナーが目視の白さ、フレキソ印刷におけるインキの発色性、均一性等が著しく際立っていた。 At the time of pasting, the situation where the hot plate was taken was not much different in the coated and non-coated liner co-corrugated cardboard sheets obtained in the Examples and Comparative Examples, but when the fruit pattern was printed on the obtained sheet, The coating liners of Examples 1 and 2 and Comparative Examples 1 to 4 were markedly outstanding in visual whiteness, ink color development, and uniformity in flexographic printing.
上記表１および２で明らかなように、比較例1、２、実施例１は、原紙の白色度が低く、茶色でくすんだ色の原紙であり、また比較例３の原紙は、明度が７０を超えているものの原紙の段階で目視白さが劣り、さらに比較例４の原紙は、白色度が７０％で、原紙の段階で目視白さが優れている等の各原紙の違いがあるが、本発明の塗工層を設けたことにより、特定の色相を有し、目視の白さ、フレキソ印刷におけるインキの発色性、印刷均一性等が優れている。さらに実施例1、２では、フレキソインキ発色性、印刷均一性および網点再現性に優れるとともに、加工時汚れに対する効果がより優れている。これに対して、比較例５、６は、塗工層を設けないとフレキソインキが染み込んでしまい、ムラとしては視認し難く、印刷均一性としては優れているが、インキ濃度が低く、フレキソ印刷品質が劣っている。また比較例７は、焼成カオリンが４０部と配合量が少ないことから、目視の白さが劣り、フレキソ印刷におけるインキの発色性が不十分で、網点再現性も劣り、ムラが目立ち印刷均一性が劣っている。比較例８は、白さ、色相が劣り、焼成カオリンを使用していないためにフレキソ印刷適性が極めて劣っている。
以上の通り、本発明により十分な目視白さを持ち、フレキソ印刷インキ、特に水性フレキソインキに対して優れたインキ発色性と印刷面の仕上がりを持つライナーまたはそれを用いた段ボールを得ることができた。
As apparent from Tables 1 and 2 above, Comparative Examples 1 and 2 and Example 1 are base papers having a low whiteness and a brown and dull color, and the base paper of Comparative Example 3 has a brightness of 70. Although the visual whiteness is inferior at the stage of the base paper, the base paper of Comparative Example 4 has a difference of each base paper such as whiteness of 70% and excellent visual whiteness at the base paper stage. By providing the coating layer of the present invention, it has a specific hue and is excellent in visual whiteness, ink color development in flexographic printing, printing uniformity, and the like. Furthermore, in Examples 1 and 2 , the flexographic ink color developability, the printing uniformity, and the halftone dot reproducibility are excellent, and the effect on stains during processing is more excellent. On the other hand, in Comparative Examples 5 and 6 , the flexo ink penetrates unless a coating layer is provided, and it is difficult to visually recognize as unevenness, and the printing uniformity is excellent, but the ink density is low, and flexographic printing is performed. The quality is inferior. In Comparative Example 7 , since the amount of calcined kaolin is 40 parts and the blending amount is small, the visual whiteness is inferior, the ink coloring property in flexographic printing is inadequate, the halftone dot reproducibility is also inferior, and uneven printing is noticeable. The sex is inferior. Comparative Example 8 is inferior in whiteness and hue, and is extremely inferior in flexographic printing because no calcined kaolin is used.
As described above, according to the present invention, it is possible to obtain a liner having sufficient visual whiteness and having excellent ink color development and a printed surface finish for flexographic inks, particularly aqueous flexographic inks, or a corrugated cardboard using the liner. It was.
Claims (6)
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