JP2021165444A - Paperboard - Google Patents
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- JP2021165444A JP2021165444A JP2020068256A JP2020068256A JP2021165444A JP 2021165444 A JP2021165444 A JP 2021165444A JP 2020068256 A JP2020068256 A JP 2020068256A JP 2020068256 A JP2020068256 A JP 2020068256A JP 2021165444 A JP2021165444 A JP 2021165444A
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- paperboard
- paper
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- paper layer
- ash content
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- 239000011087 paperboard Substances 0.000 title claims abstract description 96
- 239000000123 paper Substances 0.000 claims abstract description 82
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000005336 cracking Methods 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 112
- 229920001131 Pulp (paper) Polymers 0.000 description 18
- 239000002994 raw material Substances 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000002344 surface layer Substances 0.000 description 8
- 239000003623 enhancer Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 239000002655 kraft paper Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 239000004909 Moisturizer Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000011111 cardboard Substances 0.000 description 3
- 230000001333 moisturizer Effects 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 235000012211 aluminium silicate Nutrition 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
- 239000002761 deinking Substances 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 239000013055 pulp slurry Substances 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 241000609240 Ambelania acida Species 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229920001407 Modal (textile) Polymers 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 229920006319 cationized starch Polymers 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006081 fluorescent whitening agent Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- DYUWTXWIYMHBQS-UHFFFAOYSA-N n-prop-2-enylprop-2-en-1-amine Chemical compound C=CCNCC=C DYUWTXWIYMHBQS-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910021647 smectite Inorganic materials 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000013053 water resistant agent Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Wrappers (AREA)
- Paper (AREA)
Abstract
Description
本発明は、板紙に関する。 The present invention relates to paperboard.
板紙は、木材パルプ、古紙などを原料として製造した厚い紙の総称であり、段ボール原紙、白板紙などがあり、包装材料として使用される。板紙がたとえば箱状の包装材料として使用される場合、板紙を折り曲げるために罫線が形成される。罫線が形成された板紙を折り曲げたとき、板紙の表側は伸びの力を受け、亀裂が入ることがある。このように亀裂が入った状態を罫割れといい、罫割れにより美粧性が低下するだけではなく、包装材料の強度不足につながるという課題がある。 Paperboard is a general term for thick paper made from wood pulp, used paper, etc., and includes corrugated cardboard base paper, white paperboard, etc., which are used as packaging materials. When paperboard is used, for example, as a box-shaped packaging material, ruled lines are formed to fold the paperboard. When the paperboard on which the ruled lines are formed is bent, the front side of the paperboard is subjected to the stretching force and may be cracked. Such a state in which cracks are formed is called a ruled crack, and there is a problem that the cracked not only deteriorates the cosmetic appearance but also leads to insufficient strength of the packaging material.
上記課題を解決するために、特許文献１には、少なくとも表面層及び裏面層の２層以上の層を具備し、少なくとも前記表面層が、保湿剤を含有することを特徴とするライナー紙が開示され、ライナー紙が水分を放出することを効果的に抑制し、その結果罫線割れの発生を防止すると記載されている。
また、特許文献２には、ライナと波状の中芯とを貼り合せた段ボールにおいて、前記ライナに、罫割れ防止剤として、水に保湿剤を１０〜３０重量％、界面活性剤を含有する浸透剤を０．２〜３．０重量％配合したものを塗布したことを特徴とする罫割れ防止段ボールが開示され、罫割れ防止剤に浸透剤を配合したので、保湿剤がライナに速やかに浸透し、フォルダグルア等による製箱速度に対応して、罫割れ防止効果を確実に得ることができると記載されている。
さらに、特許文献３には、古紙パルプを含有するパルプスラリーに、水溶性のリグニン系物質および、特定のジアリルアミン系モノマーを構成モノマーとする共重合体を添加することにより、乾燥強度が高く、かつ段割れ（罫割れ）を発生しにくいなど、優れた品質の紙が製造できると記載されている。
In order to solve the above problems, Patent Document 1 discloses a liner paper comprising at least two or more layers, a front surface layer and a back surface layer, and at least the surface layer contains a moisturizer. It is stated that the liner paper effectively suppresses the release of moisture, and as a result, the occurrence of ruled line cracking is prevented.
Further, Patent Document 2 describes that in corrugated cardboard in which a liner and a wavy core are bonded together, the liner contains 10 to 30% by weight of a moisturizer and a surfactant as a rule cracking preventive agent. A ruled crack prevention corrugated cardboard characterized by applying a compound containing 0.2 to 3.0% by weight of an agent is disclosed, and since a penetrant is blended with the rule crack preventing agent, the moisturizer quickly penetrates into the liner. However, it is stated that the effect of preventing line cracking can be reliably obtained in response to the box-making speed of the folder gluer or the like.
Further, in Patent Document 3, by adding a water-soluble lignin-based substance and a copolymer containing a specific diallylamine-based monomer as a constituent monomer to a pulp slurry containing recycled paper pulp, the drying strength is high and the drying strength is high. It is stated that excellent quality paper can be manufactured, such as being less prone to step cracking (rule cracking).
上記のように様々な罫割れ防止方法が提案されているが、いまだ十分に罫割れを防止できていなかった。本発明は、効果的に罫割れを防止できる板紙を提供することを目的とする。 As described above, various methods for preventing rule cracking have been proposed, but the rule cracking has not yet been sufficiently prevented. An object of the present invention is to provide a paperboard capable of effectively preventing line cracking.
本発明者は、２層以上の紙層を備える板紙の表面に位置する第１紙層の灰分含有率が、全層の灰分含有率の平均値よりも所定値以上低いことにより、効果的に罫割れを防止し、生産性に優れる板紙を提供できることを見出した。
すなわち、本発明は、以下の＜１＞〜＜９＞に関する。
＜１＞ ２層以上の紙層を備える板紙であって、ＩＳＯ １７６２：２００１に準拠して測定される、表面に位置する第１紙層の灰分含有率が、全層の灰分含有率の平均値よりも０．５質量％以上低いことを特徴とする、板紙。
＜２＞ 前記第１紙層の灰分が、８．０質量％以上である、＜１＞に記載の板紙。
＜３＞ 前記第１紙層の坪量が、他の紙層と比べて最も少ない、＜１＞または＜２＞に記載の板紙。
＜４＞ 坪量が、１００ｇ／ｍ２以上４００ｇ／ｍ２以下である、＜１＞〜＜３＞のいずれかに記載の板紙。
＜５＞ ３層以上の紙層を備え、前記第１紙層の坪量が、全層の坪量に対して、１５％以上３０％以下であり、裏面に位置する紙層の坪量が、全層の坪量に対して、３５％以上６０％以下である、＜１＞〜＜４＞のいずれかに記載の板紙。
＜６＞ 比破壊靭性が、６．５ｍＪ・ｍ／ｇ以上である、＜１＞〜＜５＞のいずれかに記載の板紙。
＜７＞ 前記第１紙層の灰分含有率が、全層の灰分含有率の平均値よりも１．５質量％以上低い、＜１＞〜＜６＞のいずれかに記載の板紙。
＜８＞ 前記板紙がライナー原紙である、＜１＞〜＜７＞のいずれかに記載の板紙。
＜９＞ ２層以上の紙層を備える板紙の製造方法であって、ＩＳＯ １７６２：２００１に準拠して測定される、表面に位置する第１紙層の灰分含有率を、全層の灰分含有率の平均値よりも０．５質量％以上低くすることを特徴とする、板紙の製造方法。
The present invention is effective because the ash content of the first paper layer located on the surface of the paperboard having two or more paper layers is lower than the average value of the ash content of all the layers by a predetermined value or more. We have found that it is possible to provide paperboard with excellent productivity by preventing line cracking.
That is, the present invention relates to the following <1> to <9>.
<1> A paperboard having two or more paper layers, the ash content of the first paper layer located on the surface measured in accordance with ISO 1762: 2001 is the average of the ash content of all layers. Paperboard characterized by being 0.5% by mass or more lower than the value.
<2> The paperboard according to <1>, wherein the ash content of the first paper layer is 8.0% by mass or more.
<3> The paperboard according to <1> or <2>, wherein the first paper layer has the smallest basis weight as compared with other paper layers.
<4> The paperboard according to any one of <1> to <3>, wherein the basis weight is 100 g / m 2 or more and 400 g / m 2 or less.
<5> A paper layer having three or more layers is provided, and the basis weight of the first paper layer is 15% or more and 30% or less of the basis weight of all layers, and the basis weight of the paper layer located on the back surface is The paperboard according to any one of <1> to <4>, which is 35% or more and 60% or less with respect to the basis weight of all layers.
<6> The paperboard according to any one of <1> to <5>, which has a specific fracture toughness of 6.5 mJ · m / g or more.
<7> The paperboard according to any one of <1> to <6>, wherein the ash content of the first paper layer is 1.5% by mass or more lower than the average value of the ash content of all layers.
<8> The paperboard according to any one of <1> to <7>, wherein the paperboard is a liner base paper.
<9> A method for producing paperboard having two or more paper layers, in which the ash content of the first paper layer located on the surface, which is measured in accordance with ISO 1762: 2001, is the ash content of all layers. A method for producing paperboard, which comprises 0.5% by mass or more lower than the average value of the rate.
本発明によれば、効果的に罫割れを防止できる板紙を提供できる。 According to the present invention, it is possible to provide a paperboard capable of effectively preventing line cracking.
［板紙］
本発明の板紙（以下、単に「板紙」ともいう）は、２層以上の紙層を備える板紙であって、ＩＳＯ １７６２：２００１に準拠して測定される、表面に位置する第１紙層の灰分含有率が、全層の灰分含有率の平均値よりも０．５質量％以上低いことを特徴とする。
[Paperboard]
The paperboard of the present invention (hereinafter, also simply referred to as "paperboard") is a paperboard having two or more layers of paper, and is a first paper layer located on the surface, which is measured in accordance with ISO 1762: 2001. The ash content is 0.5% by mass or more lower than the average value of the ash content of all layers.
本発明の板紙は、２層以上の紙層を備える。本発明の板紙は、表面に位置する紙層である第１紙層（表層）と、該第１紙層の裏面に形成され、かつ、板紙の裏面に位置する紙層である第２紙層（裏層）とから構成される２層の紙層を備えていてもよいし、表面に位置する第１紙層（表層）と、該第１紙層の裏面に形成される第２紙層と、該第２紙層の裏面に形成され、かつ、板紙の裏面に位置する紙層である第３紙層（裏層）とから構成される３層の紙層を備えていてもよいし、表面に位置する第１紙層（表層）と、該第１紙層の裏面に形成される第２紙層と、該第２紙層の裏面に形成される第３紙層と、該第３紙層の裏面に形成され、かつ、板紙の裏面に位置する紙層である第４紙層（裏層）とから構成される４層の紙層を備えていてもよい。 The paperboard of the present invention includes two or more layers of paper. The paperboard of the present invention has a first paper layer (surface layer) which is a paper layer located on the front surface and a second paper layer which is a paper layer formed on the back surface of the first paper layer and located on the back surface of the paperboard. A two-layer paper layer composed of a (back layer) may be provided, or a first paper layer (front layer) located on the front surface and a second paper layer formed on the back surface of the first paper layer may be provided. And, a three-layer paper layer formed on the back surface of the second paper layer and composed of a third paper layer (back layer) which is a paper layer located on the back surface of the paperboard may be provided. , A first paper layer (surface layer) located on the front surface, a second paper layer formed on the back surface of the first paper layer, a third paper layer formed on the back surface of the second paper layer, and the first paper layer. A four-layer paper layer formed on the back surface of the three paper layers and composed of a fourth paper layer (back layer) which is a paper layer located on the back surface of the paperboard may be provided.
＜第１紙層＞
（灰分含有率）
第１紙層の灰分含有率（灰分）は、罫割れ防止および生産性の観点から、好ましくは８．０質量％以上、より好ましくは９．０質量％以上、さらに好ましくは１０．０質量％以上であり、そして、好ましくは１５．０質量％以下、より好ましくは１４．０質量％以下である。
板紙を構成する紙層の灰分は、ＩＳＯ １７６２：２００１に準拠して測定される。
<First paper layer>
(Ash content)
The ash content (ash content) of the first paper layer is preferably 8.0% by mass or more, more preferably 9.0% by mass or more, still more preferably 10.0% by mass, from the viewpoint of preventing rule cracking and productivity. The above, and preferably 15.0% by mass or less, more preferably 14.0% by mass or less.
The ash content of the paper layer constituting the paperboard is measured according to ISO 1762: 2001.
罫割れを防止する観点から、第１紙層の灰分含有率は、全層の灰分含有率の平均値よりも０．５質量％以上低く、全層の灰分含有率の平均値よりも１．０質量％以上低いことが好ましく、全層の灰分含有率の平均値よりも１．５質量％以上低いことがより好ましい。 From the viewpoint of preventing line cracking, the ash content of the first paper layer is 0.5% by mass or more lower than the average value of the ash content of all layers, and 1. It is preferably 0% by mass or more, and more preferably 1.5% by mass or more lower than the average value of the ash content of all layers.
（坪量）
第１紙層の坪量は、罫割れ防止等の観点から、他の紙層と比べて最も少ないことが好ましい。
板紙が３層以上の紙層を備える場合、第１紙層の坪量は、全層の坪量に対して、好ましくは１５％以上、より好ましくは２０％以上であり、そして、好ましくは３０％以下、より好ましくは３０％未満、さらに好ましくは２５％以下である。
板紙を構成する紙層の坪量は、ＩＳＯ ５３６：１９９５に準拠して測定される。
(Basis weight)
The basis weight of the first paper layer is preferably the smallest as compared with other paper layers from the viewpoint of preventing rule cracking and the like.
When the paperboard includes three or more layers of paper, the basis weight of the first paper layer is preferably 15% or more, more preferably 20% or more, and preferably 30% with respect to the basis weight of all layers. % Or less, more preferably less than 30%, still more preferably 25% or less.
The basis weight of the paper layer constituting the paperboard is measured according to ISO 536: 1995.
＜裏面に位置する紙層（裏層）＞
板紙が３層以上の紙層を備える場合、板紙の裏面に位置する紙層（裏層）の坪量は、全層の坪量に対して、好ましくは３５％以上、より好ましくは４０％以上であり、そして、好ましくは６０％以下、より好ましくは５５％以下である。
<Paper layer located on the back side (back layer)>
When the paperboard includes three or more paper layers, the basis weight of the paper layer (back layer) located on the back surface of the paperboard is preferably 35% or more, more preferably 40% or more, based on the basis weight of all layers. And preferably 60% or less, more preferably 55% or less.
＜原料パルプ＞
板紙の原料パルプとしては、たとえば木材パルプ、非木材パルプ、および脱墨パルプが挙げられる。木材パルプとしては、特に限定されないが、たとえば広葉樹クラフトパルプ（ＬＫＰ）、針葉樹クラフトパルプ（ＮＫＰ）、サルファイトパルプ（ＳＰ）、溶解パルプ（ＤＰ）、ソーダパルプ（ＡＰ）、晒しクラフトパルプ（ＢＫＰ）、未晒しクラフトパルプ（ＵＫＰ）、酸素漂白クラフトパルプ（ＯＫＰ）等の化学パルプ、セミケミカルパルプ（ＳＣＰ）、ケミグラウンドウッドパルプ（ＣＧＰ）等の半化学パルプ、砕木パルプ（ＧＰ）、サーモメカニカルパルプ（ＴＭＰ、ＢＣＴＭＰ）等の機械パルプ等が挙げられる。非木材パルプとしては、特に限定されないが、たとえばコットンリンター、コットンリント等の綿系パルプ、竹、麻、麦わら、バガス等の非木材系パルプが挙げられる。脱墨パルプとしては、特に限定されないが、たとえば古紙を原料とする脱墨パルプが挙げられる。原料パルプは、上記の１種を単独でも２種以上混合して用いてもよい。なお、原料パルプに、ポリアミド繊維、ポリエステル繊維等の有機合成繊維、ポリノジック繊維等の再生繊維、ガラス繊維、セラミック繊維、カーボン繊維等の無機繊維を混用してもよい。
<Raw material pulp>
Raw material pulp for paperboard includes, for example, wood pulp, non-wood pulp, and deinked pulp. The wood pulp is not particularly limited, but for example, broadleaf kraft pulp (LKP), coniferous kraft pulp (NKP), sulfite pulp (SP), dissolved pulp (DP), soda pulp (AP), and bleached kraft pulp (BKP). , Unbleached kraft pulp (UKP), chemical pulp such as oxygen bleached kraft pulp (OKP), semi-chemical pulp such as semi-chemical pulp (SCP), chemiground wood pulp (CGP), crushed wood pulp (GP), thermomechanical pulp Examples thereof include mechanical pulp such as (TMP, BCTMP). The non-wood pulp is not particularly limited, and examples thereof include cotton pulp such as cotton linter and cotton lint, and non-wood pulp such as bamboo, hemp, straw, and bagasse. The deinking pulp is not particularly limited, and examples thereof include deinking pulp made from recycled paper. As the raw material pulp, one of the above types may be used alone or a mixture of two or more types may be used. The raw material pulp may be mixed with organic synthetic fibers such as polyamide fibers and polyester fibers, recycled fibers such as polynosic fibers, and inorganic fibers such as glass fibers, ceramic fibers and carbon fibers.
原料パルプは、入手のしやすさという観点から、木材パルプおよび脱墨パルプが好ましい。また、脱墨パルプの中では、古紙を原料とするものが好ましい。 As the raw material pulp, wood pulp and deinked pulp are preferable from the viewpoint of availability. Further, among the deinked pulp, those made from used paper are preferable.
原料パルプには、必要に応じて、たとえば、アニオン性、カチオン性もしくは両性の歩留剤、濾水性向上剤、乾燥紙力増強剤、湿潤紙力増強剤、サイズ剤、填料等の内添助剤、耐水化剤、染料、蛍光増白剤等の任意成分を添加してもよい。
乾燥紙力増強剤としては、カチオン化澱粉、ポリアクリルアミド、カルボキシメチルセルロース等が挙げられる。
湿潤紙力増強剤としては、ポリアミドポリアミンエピクロロヒドリン、尿素ホルムアルデヒド樹脂、メラミンホルムアルデヒド樹脂等が挙げられる。
填料としては、タルク、カオリン、焼成カオリン、炭酸カルシウム、硫酸カルシウム、硫酸バリウム、二酸化チタン、酸化亜鉛、アルミナ、炭酸マグネシウム、酸化マグネシウム、シリカ、ホワイトカーボン、ベントナイト、ゼオライト、セリサイト、スメクタイト等の無機填料、アクリル系樹脂、塩化ビニリデン系樹脂等の有機填料が挙げられる。
If necessary, the raw material pulp may be supplemented with, for example, anionic, cationic or amphoteric retention agents, drainage improvers, dry paper strength enhancers, wet paper strength enhancers, sizing agents, fillers and the like. Any component such as an agent, a water resistant agent, a dye, and a fluorescent whitening agent may be added.
Examples of the dry paper strength enhancer include cationized starch, polyacrylamide, carboxymethyl cellulose and the like.
Examples of the wet paper strength enhancer include polyamide polyamine epichlorohydrin, urea formaldehyde resin, and melamine formaldehyde resin.
Fillers include talc, kaolin, calcined kaolin, calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, alumina, magnesium carbonate, magnesium oxide, silica, white carbon, bentonite, zeolite, sericite, smectite and other inorganic substances. Examples thereof include organic fillers such as fillers, acrylic resins, and vinylidene chloride resins.
＜板紙の製造方法＞
本発明の板紙の製造方法は、２層以上の紙層を備える板紙の製造方法であって、ＩＳＯ １７６２：２００１に準拠して測定される、表面に位置する第１紙層の灰分含有率を、全層の灰分含有率の平均値よりも０．５質量％以上低くすることを特徴とする。
<Manufacturing method of paperboard>
The method for producing paperboard of the present invention is a method for producing paperboard having two or more layers of paper, and measures the ash content of the first paper layer located on the surface according to ISO 1762: 2001. , 0.5% by mass or more lower than the average value of the ash content of all layers.
板紙の製造方法は、表面に位置する第１紙層の灰分含有率を、全層の灰分含有率の平均値よりも０．５質量％以上低くすることができる方法であれば、特に限定されないが、原料パルプを含有するパルプスラリーを抄紙し、乾燥する工程を含む。抄紙方法についても、特に限定されず、たとえばｐＨが４．５付近で抄紙を行う酸性抄紙法、ｐＨが約６〜約９で抄紙を行う中性抄紙法等が挙げられる。抄紙機についても、特に限定されず、たとえば長網式、円網式、傾斜式等の連続抄紙機、またはこれらを組み合わせた多層抄き合わせ抄紙機等が挙げられる。なお、抄紙機に、灰分測定装置としてＢＭ計等を設置してもよい。また、乾燥方法についても、特に限定されず、公知の乾燥装置を用いることができる。 The method for producing paperboard is not particularly limited as long as the ash content of the first paper layer located on the surface can be made 0.5% by mass or more lower than the average value of the ash content of all layers. However, it includes a step of making a pulp slurry containing raw material pulp and drying it. The papermaking method is also not particularly limited, and examples thereof include an acidic papermaking method in which papermaking is performed at a pH of around 4.5, and a neutral papermaking method in which papermaking is performed at a pH of about 6 to about 9. The paper machine is also not particularly limited, and examples thereof include continuous paper machines such as long net type, circular net type, and inclined type, and multi-layer paper making machines combining these. A BM meter or the like may be installed in the paper machine as an ash content measuring device. Further, the drying method is not particularly limited, and a known drying device can be used.
第１紙層の灰分含有率を、全層の灰分含有率の平均値よりも０．５質量％以上低くする方法としては、たとえば、第１紙層を形成する際に添加する填料の量を、他の紙層を形成する際に添加する填料の量よりも少なくすること、第１紙層を形成する際、抄紙前に希釈水として使用される白水の量を、他の紙層を形成する際に使用される白水の量よりも少なくすることなどが挙げられる。 As a method of lowering the ash content of the first paper layer by 0.5% by mass or more from the average value of the ash content of all layers, for example, the amount of filler added when forming the first paper layer is used. The amount of white water used as diluting water before papermaking when forming the first paper layer should be less than the amount of filler added when forming the other paper layer, and the other paper layer should be formed. For example, the amount of white water used when doing so should be less than the amount used.
＜板紙の特性＞
（坪量）
板紙の坪量（全層の坪量）は、好ましくは１００ｇ／ｍ２以上、より好ましくは１３０ｇ／ｍ２以上、さらに好ましくは１６０ｇ／ｍ２以上であり、そして、好ましくは４００ｇ／ｍ２以下、より好ましくは３５０ｇ／ｍ２以下、さらに好ましくは３００ｇ／ｍ２以下、特に好ましくは２００ｇ／ｍ２以下である。板紙の坪量が上記範囲内であると、板紙をライナー原紙として好適に用いることができる。一方、紙器用板紙として好適な坪量は、特に限定されないが、好ましくは１００ｇ／ｍ２以上、より好ましくは２００ｇ／ｍ２以上であり、そして、好ましくは６００ｇ／ｍ２以下、より好ましくは４００ｇ／ｍ２以下である。
板紙の坪量は、ＩＳＯ ５３６：１９９５に準拠して測定される。
<Characteristics of paperboard>
(Basis weight)
The basis weight of the paperboard (the basis weight of all layers) is preferably 100 g / m 2 or more, more preferably 130 g / m 2 or more, still more preferably 160 g / m 2 or more, and preferably 400 g / m 2 or less. , More preferably 350 g / m 2 or less, still more preferably 300 g / m 2 or less, and particularly preferably 200 g / m 2 or less. When the basis weight of the paperboard is within the above range, the paperboard can be suitably used as the liner base paper. On the other hand, the basis weight suitable for the paperboard for paper containers is not particularly limited, but is preferably 100 g / m 2 or more, more preferably 200 g / m 2 or more, and preferably 600 g / m 2 or less, more preferably 400 g. It is less than / m 2.
The basis weight of the paperboard is measured according to ISO 536: 1995.
（厚さ）
板紙の厚さは、好ましくは０．１０ｍｍ以上、より好ましくは０．１５ｍｍ以上であり、そして、好ましくは０．４０ｍｍ以下、より好ましくは０．３５ｍｍ以下である。板紙の厚さが上記範囲内であると、板紙をライナー原紙として好適に用いることができる。
板紙の厚さは、実施例に記載の方法により測定される。
(thickness)
The thickness of the paperboard is preferably 0.10 mm or more, more preferably 0.15 mm or more, and preferably 0.40 mm or less, more preferably 0.35 mm or less. When the thickness of the paperboard is within the above range, the paperboard can be suitably used as the liner base paper.
The thickness of the paperboard is measured by the method described in the examples.
（比破壊靭性）
板紙の比破壊靭性は、より効果的に罫割れを防止する観点から、好ましくは６．５ｍＪ・ｍ／ｇ以上、より好ましくは７．０ｍＪ・ｍ／ｇ以上である。
板紙の比破壊靭性は、ＩＳＯ／ＴＳ １７９５８：２０１３に準拠して測定される。
(Specific fracture toughness)
The specific fracture toughness of the paperboard is preferably 6.5 mJ · m / g or more, more preferably 7.0 mJ · m / g or more, from the viewpoint of more effectively preventing line cracking.
The specific fracture toughness of paperboard is measured according to ISO / TS 17958: 2013.
本発明の板紙は、第１紙層（表層）の灰分含有率を、全層の灰分含有率の平均値よりも所定値以上低くすることにより、同質量あたりの繊維の割合が増え、比破壊靭性を向上させることができ、罫割れを効果的に防止することができると考えられる。
また、本発明の板紙の製造工程において、上述したように、たとえば、第１紙層を形成する際、抄紙前に希釈水として使用される白水の量を、他の紙層を形成する際に使用される白水の量よりも少なくすること等により、第１紙層の灰分含有率を、全層の灰分含有率の平均値よりも所定値以上低くなるように、簡便に調整できるため、生産性に優れる。
In the paperboard of the present invention, the ash content of the first paper layer (surface layer) is made lower than the average value of the ash content of all layers by a predetermined value or more, so that the ratio of fibers per the same mass increases and specific fracture occurs. It is considered that the toughness can be improved and the rule cracking can be effectively prevented.
Further, in the paperboard manufacturing process of the present invention, as described above, for example, when forming the first paper layer, the amount of white water used as diluting water before papermaking is used to form another paper layer. By making the amount less than the amount of white water used, the ash content of the first paper layer can be easily adjusted to be lower than the average value of the ash content of all layers by a predetermined value or more. Excellent in sex.
以下に実施例と比較例とを挙げて本発明の特徴をさらに具体的に説明する。以下の実施例に示す材料、使用量、割合、処理内容、処理手順等は、本発明の趣旨を逸脱しない限り適宜変更することができる。したがって、本発明の範囲は以下に示す具体例により限定的に解釈されるべきものではない。なお、実施例および比較例中の「部」および「％」は、特に断らない限り、それぞれ「質量部」および「質量％」を示す。 Hereinafter, the features of the present invention will be described in more detail with reference to Examples and Comparative Examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the scope of the present invention should not be construed as limited by the specific examples shown below. Unless otherwise specified, "parts" and "%" in Examples and Comparative Examples indicate "parts by mass" and "% by mass", respectively.
［分析および評価］
板紙を構成する紙層および板紙について、以下の測定および評価を行った。
[Analysis and evaluation]
The following measurements and evaluations were performed on the paper layers and paperboards that make up the paperboard.
（灰分含有率）
板紙を構成する紙層の灰分含有率（灰分）は、ＩＳＯ １７６２：２００１に準拠して測定した。
(Ash content)
The ash content (ash content) of the paper layer constituting the paperboard was measured according to ISO 1762: 2001.
（坪量）
板紙を構成する紙層および板紙の坪量は、ＩＳＯ ５３６：１９９５に準拠して測定した。
(Basis weight)
The paper layers constituting the paperboard and the basis weight of the paperboard were measured according to ISO 536: 1995.
（厚さ）
板紙の厚さは、ＩＳＯ ５３４：２０１１に準拠して測定した。
(thickness)
The thickness of the paperboard was measured according to ISO 534: 2011.
（密度）
板紙の密度は、板紙の坪量および厚さから求めた。
(density)
The density of the paperboard was determined from the basis weight and thickness of the paperboard.
（比破壊靭性）
板紙の比破壊靭性は、ＩＳＯ／ＴＳ １７９５８：２０１３に準拠して測定した。
(Specific fracture toughness)
The specific fracture toughness of the paperboard was measured according to ISO / TS 17958: 2013.
（罫割れの評価）
板紙の罫割れの評価は、以下のように行った。罫線を入れた下敷き用板紙に、実施例または比較例の板紙の裏面に位置する紙層（裏層）が、下敷き用板紙との固定面となるように、板紙を重ね合わせて固定して試験サンプルとし、水分率が３．０％となるように調湿した。その後、実施例または比較例の板紙側を折り目の山としてローラで折った。折った試験サンプルの全長に対して、試験サンプルが割れている長さを算出し、罫割れ長さ率とした。罫割れ長さ率が低いほど罫割れをより防止できることを示す。
(Evaluation of rule cracking)
The evaluation of the cracked lines on the paperboard was performed as follows. Test by superimposing and fixing the paperboard so that the paper layer (back layer) located on the back surface of the paperboard of the example or the comparative example becomes the fixed surface with the paperboard for the underlay on the paperboard for the underlay with the ruled lines. A sample was used, and the humidity was adjusted so that the water content was 3.0%. Then, the paperboard side of the example or the comparative example was folded with a roller with the creases as ridges. The length at which the test sample was cracked was calculated with respect to the total length of the folded test sample, and used as the ruled crack length ratio. It is shown that the lower the rule crack length ratio, the more the rule crack can be prevented.
［実施例１］
第１紙層（表層）には針葉樹晒クラフトパルプ（ＮＢＫＰ）とケント古紙を含む原料パルプを使用し、第２紙層には板紙古紙を含む原料パルプを使用し、第３紙層（裏層）には段ボール古紙を含む原料パルプを使用した。各紙層の灰分は、各原料パルプをパルプ洗浄機（商品名：ＤＮＴウォッシャー、相川鉄工株式会社製）に通すことによって調整した。これらの原料パルプを用いて、３層に抄き合わせ、表１に示す坪量を有する紙層と、これらの紙層からなる板紙を得た。第１紙層（表層）には固形分で、原料パルプ１００部に対して、サイズ剤（商品名：サイズパインＮ−８３０、荒川化学工業株式会社製）０．５部、硫酸バンド２．０部、紙力増強剤としてポリアクリルアミド（商品名：ポリストロン、荒川化学工業株式会社製）０．２部を添加した。第２紙層には固形分で、原料パルプ１００部に対して、硫酸バンド２．０部、紙力増強剤としてポリアクリルアミド（商品名：ポリストロン、荒川化学工業株式会社製）０．２部を添加した。第３紙層（裏層）には固形分で、原料パルプ１００部に対して、サイズ剤（商品名：サイズパインＮ−８３０、荒川化学工業株式会社製）０．５部、硫酸バンド２．０部、紙力増強剤としてポリアクリルアミド（商品名：ポリストロン、荒川化学工業株式会社製）０．２部を添加した。紙層および板紙の測定および評価結果を表１に示す。
[Example 1]
The first paper layer (surface layer) uses raw material pulp containing coniferous bleached kraft pulp (NBKP) and Kent waste paper, the second paper layer uses raw material pulp containing paperboard waste paper, and the third paper layer (back layer). ) Used raw material pulp containing used corrugated paper. The ash content of each paper layer was adjusted by passing each raw material pulp through a pulp washer (trade name: DNT washer, manufactured by Aikawa Iron Works Co., Ltd.). Using these raw material pulps, they were mixed into three layers to obtain a paper layer having a basis weight shown in Table 1 and a paperboard composed of these paper layers. The first paper layer (surface layer) has a solid content of 0.5 parts of a sizing agent (trade name: Size Pine N-830, manufactured by Arakawa Chemical Industry Co., Ltd.) and 2.0 parts of sulfuric acid band for 100 parts of raw pulp. 0.2 parts of polyacrylamide (trade name: Polystron, manufactured by Arakawa Chemical Industry Co., Ltd.) was added as a paper strength enhancer. The second paper layer contains solid content of 2.0 parts of aluminum sulfate band and 0.2 parts of polyacrylamide (trade name: Polystron, manufactured by Arakawa Chemical Industry Co., Ltd.) as a paper strength enhancer for 100 parts of raw pulp. Was added. The third paper layer (back layer) contains solid content, and for every 100 parts of raw pulp, 0.5 part of a sizing agent (trade name: Size Pine N-830, manufactured by Arakawa Chemical Industries, Ltd.), a sulfuric acid band 2. 0 part, 0.2 part of polyacrylamide (trade name: Polystron, manufactured by Arakawa Chemical Industry Co., Ltd.) was added as a paper strength enhancer. Table 1 shows the measurement and evaluation results of the paper layer and the paperboard.
［実施例２］
灰分と坪量を表１に示すように調整した以外は、実施例１と同様にして板紙を作製した。紙層および板紙の測定および評価結果を表１に示す。
［比較例］
灰分と坪量を表１に示すように調整した以外は、実施例１と同様にして板紙を作製した。紙層および板紙の測定および評価結果を表１に示す。
[Example 2]
A paperboard was produced in the same manner as in Example 1 except that the ash content and the basis weight were adjusted as shown in Table 1. Table 1 shows the measurement and evaluation results of the paper layer and the paperboard.
[Comparison example]
A paperboard was produced in the same manner as in Example 1 except that the ash content and the basis weight were adjusted as shown in Table 1. Table 1 shows the measurement and evaluation results of the paper layer and the paperboard.
表１から分かるように、本実施例によれば、効果的に罫割れを防止できる板紙が提供される。 As can be seen from Table 1, according to this embodiment, a paperboard capable of effectively preventing line cracking is provided.
本発明の板紙は、効果的に罫割れを防止できるので、たとえば、ライナー原紙として好適に用いることができる。 Since the paperboard of the present invention can effectively prevent line cracking, it can be suitably used as, for example, a liner base paper.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020068256A JP7456247B2 (en) | 2020-04-06 | 2020-04-06 | paperboard |
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| JP7224108B2 (en) | 2018-03-20 | 2023-02-17 | 大王製紙株式会社 | tissue paper container |
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| JP2005133258A (en) * | 2003-10-31 | 2005-05-26 | Daio Paper Corp | Liner for corrugated board |
| JP2005200773A (en) * | 2004-01-13 | 2005-07-28 | Daio Paper Corp | Liner |
| JP2007297728A (en) * | 2006-04-28 | 2007-11-15 | Oji Paper Co Ltd | Multi-layer structure liner and method of producing the same |
| JP2011206987A (en) * | 2010-03-29 | 2011-10-20 | Oji Paper Co Ltd | Paper for reclaimed postcard |
| JP2011208333A (en) * | 2010-03-31 | 2011-10-20 | Oji Paper Co Ltd | Regenerated postcard paper |
| JP2015030930A (en) * | 2013-08-01 | 2015-02-16 | 北越紀州製紙株式会社 | Coated white cardboard |
| JP2015172260A (en) * | 2014-03-11 | 2015-10-01 | 北越紀州製紙株式会社 | Method of producing white paperboard |
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| US20190047273A1 (en) * | 2016-03-23 | 2019-02-14 | Stora Enso Oyj | Board with improved compression strength |
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