JP2014065991A - Base material for paper liquid container - Google Patents
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本発明は、胴膨れが発生せず、成形性およびグラビア印刷適性に優れた紙製液体容器用基材を提供する。 The present invention provides a base material for a paper liquid container that does not cause swelling and is excellent in moldability and gravure printing suitability.
従来より、紙製液体容器は紙製基材の両表面に熱可塑性樹脂層を設けた積層シートで成形されている。紙製液体容器は、ガラス瓶に比べ、割れない、軽量、焼却が可能な点から食品用途をはじめ各分野で広く利用されており、内容物、保存状態、保存期間等の諸状況に応じて紙製液体容器用基材と熱可塑性樹脂層の中間層にガスバリア性を有するアルミニウム箔層が設けられている。 Conventionally, a paper liquid container is formed of a laminated sheet in which a thermoplastic resin layer is provided on both surfaces of a paper base material. Compared with glass bottles, paper liquid containers are widely used in various fields including food applications because they are not broken, lightweight, and can be incinerated. Paper containers are used according to various conditions such as contents, storage conditions, and storage periods. An aluminum foil layer having gas barrier properties is provided on an intermediate layer between the liquid container base and the thermoplastic resin layer.
紙製液体容器を形成するには、積層シートに折り曲げ用の罫線加工と容器形状に合わせた打ち抜き加工がおこなわれる。その後、積層シートに入れられた罫線に沿って折り曲げ、紙製液体容器が組み立てられる。 In order to form a paper liquid container, the laminated sheet is subjected to folding ruled line processing and punching processing according to the container shape. Thereafter, the paper liquid container is assembled by bending along the ruled lines placed in the laminated sheet.
近年、ガスバリア性に優れるアルミニウム箔は、廃棄の問題から無機化合物蒸着フィルムへの代替が進んでいるが、アルミニウム箔から無機化合物蒸着フィルムへ変更した場合、アルミニウム箔の特性である成形性や形状維持性が失われ、罫線部分での折り曲げや組み立てが難しくなることが示されている（特許文献１）。また、罫線を設けたり、折り曲げた場合、無機化合物蒸着フィルムに蒸着されている無機化合物にクラックが入り、ガスバリア性が低下することが示されている（特許文献２）。 In recent years, aluminum foil with excellent gas barrier properties has been replaced by inorganic compound vapor-deposited films due to disposal problems. However, when aluminum foil is changed to inorganic compound vapor-deposited films, moldability and shape maintenance, which are the characteristics of aluminum foil, are maintained. It has been shown that it is difficult to bend and assemble at the ruled line portion (Patent Document 1). Further, it is shown that when a ruled line is provided or bent, the inorganic compound deposited on the inorganic compound vapor-deposited film is cracked and the gas barrier property is lowered (Patent Document 2).
一方、印刷適性に優れた伸張紙からなる成形用紙が提供されており（特許文献３）、印刷適性を付与する目的で柔軟剤と紙力向上剤が併用されているが、柔軟剤で紙のクッション性を向上させた場合には、紙力向上剤を用いても表面強度が大幅に低下するため満足すべき印刷適性は得られ難いといった問題がある。また、中層に柔軟剤を含有する柔軟剤を添加した液体容器用紙機材が開示されている（特許文献４）が印刷適性・加工適性の両者を充分に満足するものには至っていない。 On the other hand, molding paper made of stretched paper with excellent printability is provided (Patent Document 3), and a softener and a paper strength improver are used in combination for the purpose of imparting printability. In the case where the cushioning property is improved, there is a problem that even if a paper strength improver is used, the surface strength is greatly reduced, so that it is difficult to obtain satisfactory printability. In addition, a liquid container paper material in which a softening agent containing a softening agent is added to the middle layer is disclosed (Patent Document 4), but has not yet fully satisfied both printability and processing suitability.
また、紙は省資源や物流費の削減といった観点、環境保護運動の高まりといった社会的要求等から、低密度の紙製液体容器用基材が望まれているが、軽量化すると液体を充填した際に胴部分が液体の重みで膨れる胴膨れ現象が発生するといった問題があった。
本発明は、紙製液体容器用基材の両面に熱可塑性樹脂層を設けた積層シートを加熱成形してなる紙製液体容器の紙基材に関するもので、胴膨れが発生せず、成形性およびグラビア印刷適性に優れた紙製液体容器用基材を提供するものである。 The present invention relates to a paper base material for a paper liquid container obtained by thermoforming a laminated sheet provided with a thermoplastic resin layer on both sides of a base material for a paper liquid container. And a substrate for a paper liquid container excellent in gravure printing suitability.
本発明は、紙製容器の成形性について鋭意検討した結果、紙製液体容器を構成している紙製液体容器用基材を３層以上の多層構造とし、表裏層を除く中層に柔軟剤を含有させ、紙基材の密度を一定範囲にすることにより成形性を向上できること、また、表裏層、中層のパルプ配合を特定の条件とすることで、胴膨れを防止でき、且つグラビア印刷適性を向上させることを見出し、本発明を完成させた。 In the present invention, as a result of diligent examination of the moldability of the paper container, the paper liquid container substrate constituting the paper liquid container has a multilayer structure of three or more layers, and a softening agent is added to the middle layer excluding the front and back layers. It is possible to improve the formability by adding the density of the paper base material within a certain range, and by making the pulp composition of the front and back layers and the middle layer into specific conditions, it is possible to prevent the swelling of the body and the gravure printing suitability. As a result, the present invention has been completed.
すなわち、本発明は以下の発明を含包する。
（１）複数のパルプ層を多層化して構成された紙製液体容器用基材において、その抄き合わせ層数が３層以上であり、外層を除く中層に柔軟剤が含まれ、全体の密度が０．７５〜０．８５ｇ／ｃｍ３、ＪＡＰＡＮ ＴＡＰＰＩ Ｎｏ．５−１記載のスムースター法で測定した平滑度の値が７０ｋＰａ以下であることを特徴とする紙製液体容器用基材。
That is, the present invention includes the following inventions.
(1) In the base material for paper liquid containers formed by multilayering a plurality of pulp layers, the number of the combined layers is 3 or more, and the softening agent is contained in the middle layer excluding the outer layer, and the overall density 0.75 to 0.85 g / cm 3 , JAPAN TAPPI No. 5. A base material for a paper liquid container, wherein the smoothness value measured by the smooth star method according to 5-1, is 70 kPa or less.
（２）ＴＡＰＰＩ ＵＭ−５２２で測定される層間強度が７５０ｋＰａ以上であること、また、ＪＩＳ Ｐ ８１１３記載の方法で測定した破断伸びが２％以上であることを特徴とする紙製液体容器用基材。 (2) A base for a paper liquid container, wherein the interlayer strength measured by TAPPI UM-522 is 750 kPa or more, and the elongation at break measured by the method described in JIS P 8113 is 2% or more. Wood.
（３）外層のパルプ配合として、ＬＢＫＰを６０％以上配合することを特徴とする紙製液体容器用基材。 (3) A base material for a paper liquid container, wherein 60% or more of LBKP is blended as a pulp blend of the outer layer.
（４）中層のパルプ配合として、ＮＢＫＰを５０〜７５％配合することを特徴とする紙製液体容器用基材。 (4) A base material for a paper liquid container, wherein 50 to 75% of NBKP is blended as a middle-layer pulp blend.
（５）紙製液体容器用基材において、表裏面からの吸水がないような状態にし、７０℃に熱した３％食紅水溶液に１０分間浸漬して、断面からの吸水が２ｍｍ以下であることを特徴とする紙製液体容器用基材。 (5) In the base material for paper liquid containers, water absorption from the front and back surfaces should be avoided, soaked in a 3% red food solution heated to 70 ° C. for 10 minutes, and the water absorption from the cross section should be 2 mm or less. A base material for a paper liquid container.
（６）坪量が２００〜５００ｇ／ｍ２、ＪＩＳ Ｐ ８１２５記載の方法で測定した紙の流れ方向の剛度が１５．０ｍＮ・ｍ以上であることを特徴とする紙製液体容器用基材。 (6) A base material for a paper liquid container having a basis weight of 200 to 500 g / m 2 and a paper flow direction stiffness measured by the method described in JIS P 8125 of 15.0 mN · m or more.
本発明は、紙製液体容器用基材を主体とした紙製容器を製造する際に、成形性およびグラビア印刷適性を向上させることができる。 The present invention can improve moldability and gravure printability when producing a paper container mainly composed of a paper liquid container base material.
本発明の紙製液体容器用基材は、中層の両側に外層を有する３層以上の層構成であり、表裏層を除く中層へ柔軟剤を含有させることが重要である。柔軟剤を含有させることで繊維間結合を阻害、繊維自体を柔軟にすることができる。よって、積層シートに入れられた罫線に沿って折り曲げ易くなるという作用が働き、多種多様な罫線形状に対応させることが可能となり、成形性を飛躍的に向上させることができる。 The base material for a paper liquid container of the present invention has a layer configuration of three or more layers having outer layers on both sides of the middle layer, and it is important to contain a softener in the middle layer excluding the front and back layers. By containing a softening agent, interfiber bonding can be inhibited and the fiber itself can be softened. Therefore, the effect | action that it becomes easy to bend along the ruled line put into the lamination sheet | seat acts, it becomes possible to respond | correspond to various types of ruled line shapes, and a moldability can be improved greatly.
柔軟性を向上させるためには、紙製液体容器用基材の全層に柔軟剤を含有させるのがより効果的であるが、表裏層に含有させると表面強度が大きく低下して、熱可塑性樹脂層との接着不良を招いてしまうため好ましくない。よって、中層以外の表裏層には柔軟剤を含有させないことが好ましい。 In order to improve flexibility, it is more effective to add a softening agent to all layers of the paper liquid container base material, but if it is contained in the front and back layers, the surface strength is greatly reduced, and thermoplasticity is increased. This is not preferable because it causes poor adhesion with the resin layer. Therefore, it is preferable not to contain a softening agent in front and back layers other than the middle layer.
柔軟剤の含有量は対パルプ０．１０〜０．４０質量％が好ましく、０．１０〜０．３０質量％がより好ましい。０．１０質量％未満であると良好な成形性が得られない。また、０．４０質量％を超えると剛性が大きく低下するため、容器形成後に内容物を充填すると胴膨れが発生してしまう。 The content of the softening agent is preferably 0.10 to 0.40% by mass, and more preferably 0.10 to 0.30% by mass. If it is less than 0.10% by mass, good moldability cannot be obtained. Moreover, since rigidity will fall large when it exceeds 0.40 mass%, when the contents are filled after the container is formed, barrel swelling occurs.
本発明に用いられる柔軟剤としては、パルプ繊維表面に弱い疎水化を施し、繊維間結合を阻害できるものであれば特に限定されない。例えば、油脂系非イオン界面活性剤、糖アルコール系非イオン系界面活性剤、多価アルコール型非イオン界面活性剤、高級アルコール、多価アルコールと脂肪酸のエステル化合物、高級アルコールあるいは高級脂肪酸のポリオキシアルキレン付加物、多価アルコールと脂肪酸のエステル化合物のポリオキシアルキレン付加物、高級脂肪酸エステルのポリオキシアルキレン付加物、脂肪酸ポリアミドアミンを用いることがでる。柔軟剤の中にはサイズ性や紙力を大きく低下させるものがあり、柔軟性を維持してサイズ性と紙力のバランスを考慮して用いることが好ましく、中でも、ポリアルキレンポリアミン脂肪酸エピクロルヒドリン重縮合物からなる柔軟剤は、柔軟性、サイズ性および紙力のバランスの点で好ましい。 The softening agent used in the present invention is not particularly limited as long as it can weaken hydrophobicity on the pulp fiber surface and inhibit interfiber bonding. For example, oil-based nonionic surfactants, sugar alcohol-based nonionic surfactants, polyhydric alcohol-type nonionic surfactants, higher alcohols, ester compounds of polyhydric alcohols and fatty acids, higher alcohols or polyoxygens of higher fatty acids Alkylene adducts, polyoxyalkylene adducts of ester compounds of polyhydric alcohols and fatty acids, polyoxyalkylene adducts of higher fatty acid esters, and fatty acid polyamidoamines can be used. Some softeners greatly reduce size and paper strength, and it is preferable to use them in consideration of the balance between size and paper strength while maintaining flexibility. Among them, polyalkylene polyamine fatty acid epichlorohydrin polycondensation is preferable. A softening agent made of a material is preferable in terms of a balance between flexibility, size, and paper strength.
本発明の紙製液体容器用基材は、全体の密度が０．７５〜０．８５ｇ／ｃｍ３であることが好ましく、０．７７〜０．８２ｇ／ｃｍ３であることがより好ましい。全体の密度が０．７５ｇ／ｃｍ３未満では、容器を成形した際に剛性が低下し胴膨れが発生してしまう。また、０．８５ｇ／ｃｍ３を超えると成形性が悪化する。 The substrate for paper liquid containers of the present invention preferably has an overall density of 0.75 to 0.85 g / cm 3 , more preferably 0.77 to 0.82 g / cm 3 . If the overall density is less than 0.75 g / cm 3 , the rigidity is lowered when the container is molded, and swelling of the body occurs. On the other hand, if it exceeds 0.85 g / cm 3 , the moldability deteriorates.
更に、本発明の紙製液体容器用基材のＪＡＰＡＮ ＴＡＰＰＩ Ｎｏ．５−１記載のスムースター法で測定した平滑度の値が７０ｋＰａ以下であることが好ましい。スムースター法で測定した紙製液体容器用基材の平滑度の値が７０ｋＰａを超えると平滑性が悪くなりグラビア印刷適性が悪化してしまう。 Furthermore, the JAPAN TAPPI No. of the substrate for paper liquid containers of the present invention. The smoothness value measured by the smooth star method described in 5-1, is preferably 70 kPa or less. When the smoothness value of the base material for paper liquid containers measured by the smoother method exceeds 70 kPa, the smoothness is deteriorated and the gravure printing aptitude is deteriorated.
本発明の紙製液体容器用基材は、ＴＡＰＰＩ ＵＭ−５２２で測定される層間強度が７５０ｋＰａ以上であることが好ましい。繊維間結合を阻害する柔軟剤を添加すると層間強度は低下するが７５０ｋＰａ未満であると、特にタックの強い印刷インキでベタ印刷する場合に層間剥離を起こしやすく、部分的に膨れを生じたり、集積される際に容器のエッジ部を起点として剥離する場合があり好ましくない。 The base material for a paper liquid container of the present invention preferably has an interlayer strength measured by TAPPI UM-522 of 750 kPa or more. When a softening agent that inhibits interfiber bonding is added, the interlayer strength decreases, but when it is less than 750 kPa, delamination is likely to occur, particularly when solid printing is performed with a strong tack printing ink, causing partial swelling or accumulation. When it is done, it may peel off starting from the edge of the container, which is not preferable.
また、本発明の紙製液体容器用基材は、ＪＩＳ Ｐ８１１３記載の方法で測定した破断伸びが２％以上であることが好ましい。破断伸びが２％未満であると容器成形時や衝撃が加わった際に割れが生じることがあり好ましくない。 Moreover, it is preferable that the base material for paper liquid containers of this invention is 2% or more of elongation at break measured by the method of JISP8113. If the elongation at break is less than 2%, cracking may occur during container molding or when an impact is applied.
そのため、中層のパルプ配合としてＮＢＫＰを５０％〜７５％配合することが好ましい。中層のＮＢＫＰ配合量が５０％未満であると層間強度が低下し層間剥離を起こしやすくなる。逆に７５％を超えると紙が締まってしまうため、破断伸びが低下するだけでなく、密度が高くなり成形性が悪化してしまう。 Therefore, it is preferable to mix 50% to 75% of NBKP as a middle layer pulp blend. When the NBKP blending amount of the middle layer is less than 50%, the interlayer strength is lowered and delamination is likely to occur. Conversely, if it exceeds 75%, the paper is tightened, so that not only the elongation at break is reduced, but also the density is increased and the formability is deteriorated.
さらに、本発明の紙製液体容器用基材は、優れたグラビア印刷適性を得るため表裏層の平滑性を高めることが重要である。表裏層の平滑性を高める手段としては、外層のパルプ配合としてＬＢＫＰを６０％以上配合することが好ましい。外層のＬＢＫＰ配合量が６０％未満となると平滑性が低下しグラビア印刷した際、凹部にインキが乗らずに白抜けといった印刷不良が発生しやすくなる。 Furthermore, it is important for the base material for paper liquid containers of this invention to improve the smoothness of the front and back layers in order to obtain excellent gravure printability. As a means for enhancing the smoothness of the front and back layers, it is preferable to blend 60% or more of LBKP as a pulp blend of the outer layer. When the LBKP blending amount of the outer layer is less than 60%, the smoothness is lowered, and when gravure printing is performed, ink does not get on the concave portions, and printing defects such as white spots tend to occur.
本発明の紙製液体容器用基材は、サイズ性を高めて断面吸水度を低く抑えることが重要である。紙製液体容器用基材の表裏面は熱可塑性樹脂で保護されているため表裏面の耐水性は問題ないが、断面部分は容器形成後に約７０℃の酒を充填する際や冷却水シャワー等で接触するため、高温でのサイズ性が低いと水分を吸収し紙層剥離が発生し商品価値が損なわれる場合がある。紙層剥離は、７０℃に熱した３％食紅水溶液に１０分間浸漬し、断面からの吸水が２ｍｍを超えると紙層剥離が発生する恐れがある。断面からの吸水を抑えるには、サイズ剤の添加量を増やすことでも可能であるが、７０℃の酒を充填するときに、融点の低いものの多い柔軟剤を高添加していると吸水性が低下するため、柔軟剤の添加率を０．４％未満とすることにより制御することが本願では効果的である。成形性とのバランスからも柔軟剤の添加率は０．４％未満とすることが必要である。 It is important for the base material for paper liquid containers of the present invention to increase the size property and keep the cross-section water absorption low. The front and back surfaces of the base material for paper liquid containers are protected with a thermoplastic resin, so the water resistance of the front and back surfaces is not a problem, but the cross-section is filled with about 70 ° C sake after forming the container, a cooling water shower, etc. Therefore, when the sizing property at high temperature is low, moisture is absorbed and peeling of the paper layer occurs, which may impair the commercial value. When the paper layer is peeled off in a 3% red food solution heated to 70 ° C. for 10 minutes and the water absorption from the cross section exceeds 2 mm, the paper layer may be peeled off. In order to suppress water absorption from the cross section, it is possible to increase the amount of sizing agent added. However, when filling a 70 ° C liquor, if a softening agent with a high melting point is added, water absorption is increased. Therefore, it is effective in the present application to control the softener addition rate to be less than 0.4%. In view of the balance with moldability, the addition rate of the softening agent needs to be less than 0.4%.
本発明の紙製液体容器用基材は、坪量が２００〜５００ｇ／ｍ２であることが好ましく、更に好ましくは３００〜５００ｇ／ｍ２であることが好ましい。坪量が２００ｇ／ｍ２未満であると剛度が維持できず胴膨れが発生してしまい、５００ｇ／ｍ２を超えると成形性が悪化してしまう。 The substrate for paper liquid containers of the present invention preferably has a basis weight of 200 to 500 g / m 2 , more preferably 300 to 500 g / m 2 . If the basis weight is less than 200 g / m 2 , the stiffness cannot be maintained and swelling of the trunk occurs, and if it exceeds 500 g / m 2 , the moldability deteriorates.
また、ＪＩＳ Ｐ ８１２５記載の方法で測定した本発明の紙製液体容器用基材の流れ方向の剛度は１５．０ｍＮ・ｍ以上であることが好ましい。紙製液体容器用基材の流れ方向の剛度が１５．０ｍＮ・ｍ未満では、容器を成形し内容物を充填した際に胴膨れが発生してしまう。 Moreover, it is preferable that the rigidity of the flow direction of the base material for paper-made liquid containers of this invention measured by the method of JISP8125 is 15.0 mN * m or more. When the rigidity in the flow direction of the paper liquid container base material is less than 15.0 mN · m, swelling of the body occurs when the container is molded and filled with the contents.
本発明の紙製液体容器用基材を形成する原料パルプとしては、本発明の効果を阻害しない範囲で各種のものが使用でき、化学パルプ（針葉樹、広葉樹）や機械パルプ、古紙パルプ、非木材パルプ、合成パルプ等が挙げられる。これらパルプは単独で用いてもよいし、２種以上混合して用いてもよい。 As the raw material pulp for forming the base material for the paper liquid container of the present invention, various pulps can be used as long as the effects of the present invention are not impaired. Chemical pulp (conifer, hardwood), mechanical pulp, waste paper pulp, non-wood Examples include pulp and synthetic pulp. These pulps may be used alone or in combination of two or more.
本発明において用いられる原料パルプは、ＪＩＳ Ｐ ８１２１のカナディアンスタンダードフリーネスが３５０〜５００ｍｌの範囲となるものを用いることが好適である。フリーネスが３５０ｍｌ未満であると密度を０．７５〜０．８５ｇ／ｃｍ３に設定することは難しく、５００ｍｌを超えると紙表面が粗くなり印刷適性が悪化するほか、紙力が著しく低下する。また、抄紙工程でのトラブルを回避するために、外層のフリーネスは中層のフリーネスより高く設定する。本発明における抄紙時のｐＨは酸性抄紙である４．０付近から６〜８程度の中性抄紙領域で必要に応じて任意に選択することが可能である。 As the raw material pulp used in the present invention, it is preferable to use a pulp having a Canadian standard freeness of JIS P 8121 in the range of 350 to 500 ml. If the freeness is less than 350 ml, it is difficult to set the density to 0.75 to 0.85 g / cm 3. If the freeness exceeds 500 ml, the paper surface becomes rough and printability deteriorates, and the paper strength is remarkably lowered. In order to avoid troubles in the paper making process, the freeness of the outer layer is set higher than the freeness of the middle layer. The pH at the time of papermaking in the present invention can be arbitrarily selected in the neutral papermaking region from about 4.0 to about 6-8, which is acidic papermaking.
紙製液体容器用基材の表裏面に設けられる熱可塑性樹脂層との接着力を向上させるため、紙製液体容器用基材の表裏面に、ポリビニルアルコール、澱粉、ポリアクリルアミド、ポリエチレンイミン、アクリル系樹脂、スチレン―ブタジエン系樹脂、スチレン―イソプレン系樹脂、ポリエステル系樹脂、エチレン―酢酸ビニル系樹脂、酢酸ビニル―ビニルアルコール系樹脂、ウレタン系樹脂、フッ素系樹脂などを塗布または含浸することもできる。 Polyvinyl alcohol, starch, polyacrylamide, polyethyleneimine, acrylic on the front and back surfaces of the paper liquid container base to improve the adhesive strength with the thermoplastic resin layers provided on the front and back surfaces of the paper liquid container base It is also possible to apply or impregnate resin, styrene-butadiene resin, styrene-isoprene resin, polyester resin, ethylene-vinyl acetate resin, vinyl acetate-vinyl alcohol resin, urethane resin, fluorine resin, etc. .
本発明において、表裏面に塗布または含浸する手段としては特に限定されるものではないが、例えばバーコーター、ブレードコーター、エアーナイフコーター、ロッドコーター、ゲートロールコーター、サイズプレス、キャレンダーコーター等のロールコーター、ビルブレードコーター、ベルバパーコーター等が挙げられる。 In the present invention, the means for applying or impregnating the front and back surfaces is not particularly limited. For example, rolls such as a bar coater, a blade coater, an air knife coater, a rod coater, a gate roll coater, a size press, and a calendar coater. Examples include a coater, a bill blade coater, and a bell vapor coater.
本発明では、必要に応じて種々の内添薬品を使用できる。例えば、フッ素系樹脂、ポリアミド系樹脂、ワックスエマルション等の撥水剤、ロジン系サイズ剤、スチレン・マレイン酸、アルキルケテンダイマー、アルケニル無水コハク酸等、天然および合成の製紙用内添サイズ剤、各種紙力増強剤、湿潤紙力剤、澱粉、濾水歩留向上剤、耐水化剤、消泡剤、タルク等の填料、各種染料等を適宜使用することができる。 In the present invention, various internal additives can be used as necessary. For example, water-repellent agents such as fluorine resins, polyamide resins, wax emulsions, rosin sizing agents, styrene / maleic acid, alkyl ketene dimers, alkenyl succinic anhydrides, natural and synthetic paper additive sizing agents, various types Paper strength enhancers, wet paper strength agents, starch, drainage yield improvers, water resistance agents, antifoaming agents, fillers such as talc, various dyes, and the like can be used as appropriate.
本発明の紙製液体容器用基材を製造するための抄紙機については３層以上の抄き合わせが可能なマシンであれば特に制限はない。例えば、長網抄紙機、短網抄紙機、円網抄紙機等での抄き合わせによって抄紙され、前記の通り薬品の内添や塗布により、紙製液体容器用基材が製造される。 The paper machine for producing the paper liquid container substrate of the present invention is not particularly limited as long as it is a machine capable of making three or more layers. For example, paper is made by combining with a long paper machine, a short paper machine, a circular paper machine, and the like, and as described above, a base material for a paper liquid container is manufactured by adding or applying chemicals.
なお本発明においては、特に制限はないが、各種の仕上げ装置、例えばワインダー部前のマシンキャレンダー、および／またはスーパーキャレンダー、グロスキャレンダー、ソフトニップキャレンダー等に通紙して製品仕上げが施される。 In the present invention, although there is no particular limitation, the finished product can be finished by passing it through various finishing devices such as a machine calender in front of the winder unit and / or a super calender, gloss calender, soft nip calender, etc. Applied.
紙製液体容器用基材を主体とした積層シートの構成材料として、一般的に表裏面に設ける熱可塑性樹脂層は、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン等のポリエチレン、ポリプロピレン等のポリオレフィン系樹脂が用いられ、紙製液体容器用基材と熱可塑性樹脂層の中間層には、ポリエチレンテレフタレート、ポリブチレンテレフタレート等の飽和ポリエステル系樹脂、エチレンビニルアルコール共重合体等からなるフィルムが設けてある。また、そのフィルムの少なくとも一方には、ガスバリア性の機能を担持させるため酸化珪素、酸化アルミニウム、酸化マグネシウム等からなる無機化合物が蒸着されている。 As a constituent material of laminated sheets mainly composed of paper liquid container base materials, the thermoplastic resin layers generally provided on the front and back surfaces are low density polyethylene, polyethylene such as medium density polyethylene, high density polyethylene, and polyolefins such as polypropylene. A film made of a saturated polyester resin such as polyethylene terephthalate or polybutylene terephthalate, an ethylene vinyl alcohol copolymer, etc. is provided on the intermediate layer between the paper liquid container substrate and the thermoplastic resin layer. is there. In addition, an inorganic compound made of silicon oxide, aluminum oxide, magnesium oxide or the like is deposited on at least one of the films in order to support a gas barrier function.
以下に実施例を挙げて、本発明を具体的に説明するが、本発明はそれらの実施例に限定されるものではない。また、例中の「部」及び「％」は特に断らない限り、「質量部」及び「質量％」のことである。また、全ての例について抄造した紙はＪＩＳ Ｐ ８１１１に準じて前処理をおこなった後、各種試験に供した。 EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In the examples, “parts” and “%” mean “parts by mass” and “% by mass” unless otherwise specified. In addition, the papers made for all the examples were pretreated according to JIS P8111 and then subjected to various tests.
実施例１
表裏層にＮＢＫＰ４０部、ＬＢＫＰ６０部を混合叩解し、カナダ標準濾水度４７０ｍｌのパルプスラリーを得た。得られたパルプスラリー１００部に対して、内添紙力増強剤としてポリアクリルアミド（星光ＰＭＣ製、ＤＳ４３２６）を０．７５部（固形分換算）、内添サイズ剤としてエマルションサイズ剤（星光ＰＭＣ社製、ＡＬ−１２００）０．６５部、硫酸アルミニウム０．８部をそれぞれ添加し表裏層用の紙料を調成した。中層には、ＮＢＫＰ６５部、ＬＢＫＰ３５部を混合叩解し、カナダ標準濾水度４５０ｍｌのパルプスラリーを得た。得られたパルプスラリー１００部に対して、内添紙力増強剤としてポリアクリルアミド（荒川化学工業社製、ポリストロン１１７）を０．５部、内添サイズ剤としてエマルションサイズ剤（星光ＰＭＣ社製、ＡＬ−１２００）０．４部、硫酸アルミニウム０．８５部、柔軟剤として嵩向上剤（荒川化学工業社製、サイズパインＤＬ−ＦＡ２０）０．２８部をそれぞれ添加し中層用の紙料を調成した。
そして、これらの紙料を用いて表裏層それぞれ５０ｇ／ｍ２、中層２００ｇ／ｍ２の３層構造で抄紙し、抄紙機に設置されたキャレンダーで平滑化処理を施し、坪量３００ｇ／ｍ２、密度０．８４ｇ／ｃｍ３、スムースターが６８ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８５０ｋＰａ、紙の流れ方向の破断伸びが２．５３％、紙の流れ方向の剛度が１５．３ｍＮ・ｍ、高温サイズが１．８ｍｍであった。
Example 1
The front and back layers were mixed and beaten with 40 parts of NBKP and 60 parts of LBKP to obtain a pulp slurry with a Canadian standard freeness of 470 ml. For 100 parts of the obtained pulp slurry, 0.75 parts (in terms of solid content) of polyacrylamide (manufactured by Seiko PMC, DS4326) as an internal paper strength enhancer, and emulsion sizing agent (Seiko PMC Co., Ltd.) as an internal sizing agent Manufactured by AL-1200) 0.65 part and aluminum sulfate 0.8 part were added respectively to prepare a paper stock for front and back layers. In the middle layer, 65 parts of NBKP and 35 parts of LBKP were mixed and beaten to obtain a pulp slurry having a Canadian standard freeness of 450 ml. For 100 parts of the obtained pulp slurry, 0.5 part of polyacrylamide (manufactured by Arakawa Chemical Co., Ltd., Polystron 117) is used as an internal paper strength enhancer, and emulsion sizing agent (manufactured by Seiko PMC Co., Ltd.) , AL-1200) 0.4 part, aluminum sulfate 0.85 part, a bulk improver (made by Arakawa Chemical Industries, size pine DL-FA20) 0.28 part as a softener is added, respectively, and the stock for the middle layer is added. Prepared.
The front and back layers each 50 g / m 2 by using these paper stock, paper making a three-layer structure of the intermediate layer 200 g / m 2, subjected to a smoothing process in the installed calender in a paper machine, basis weight 300 g / m 2 and a density of 0.84 g / cm 3 and a smoother of 68 kPa for a paper liquid container substrate were obtained. The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 850 kPa, the breaking elongation in the paper flow direction was 2.53%, the stiffness in the paper flow direction was 15.3 mN · m, and the high temperature size was 1 0.8 mm.
実施例２
表裏層のパルプ配合をＮＢＫＰ２０部、ＬＢＫＰ８０部としたこと以外は実施例１と同様にして、坪量３００ｇ／ｍ２、密度０．８２ｇ／ｃｍ３、スムースターが６５ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８４６ｋＰａ、紙の流れ方向の破断伸びが２．５７％、紙の流れ方向の剛度が１６．０ｍＮ・ｍ、高温サイズが１．８ｍｍであった。
Example 2
A base for a paper liquid container having a basis weight of 300 g / m 2 , a density of 0.82 g / cm 3 , and a smoother of 65 kPa, except that the pulp composition of the front and back layers is 20 parts NBKP and 80 parts LBKP. The material was obtained. The paper quality of the obtained paper liquid container base material was measured, the interlayer strength was 846 kPa, the breaking elongation in the paper flow direction was 2.57%, the stiffness in the paper flow direction was 16.0 mN · m, and the high temperature size was 1 0.8 mm.
実施例３
表裏層にＮＢＫＰ３０部、ＬＢＫＰ７０部を混合叩解し、カナダ標準濾水度４７５ｍｌのパルプスラリーを得た。得られたパルプスラリー１００部に対して、内添紙力増強剤としてポリアクリルアミド（星光ＰＭＣ製、ＤＳ４３２６）を０．７５部（固形分換算）、内添サイズ剤としてエマルションサイズ剤（星光ＰＭＣ社製、ＡＬ−１２００）０．６５部、硫酸アルミニウム０．８部をそれぞれ添加し表裏層用の紙料を調成した。中層には、ＮＢＫＰ６５部、ＬＢＫＰ３５部を混合叩解し、カナダ標準濾水度４５０ｍｌのパルプスラリーを得た。得られたパルプスラリー１００部に対して、内添紙力増強剤としてポリアクリルアミド（星光ＰＭＣ社製、ＤＳ４３２６）を０．２部、内添サイズ剤としてエマルションサイズ剤（星光ＰＭＣ社製、ＡＬ−１２００）０．４部、硫酸アルミニウム０．４部、柔軟剤として嵩向上剤（荒川化学工業社製、サイズパインＤＬ−ＦＡ２０）０．１４部をそれぞれ添加し中層用の紙料を調成した。
そして、これらの紙料を用いて表裏層それぞれ５０ｇ／ｍ２、中層２００ｇ／ｍ２の３層構造で抄紙し、抄紙機に設置されたキャレンダーで平滑化処理を施し、坪量３００ｇ／ｍ２、密度０．８０５ｇ／ｃｍ３、スムースターが６６ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９２１ｋＰａ、紙の流れ方向の破断伸びが２．８４％、紙の流れ方向の剛度が１６．６ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 3
NBKP 30 parts and LBKP 70 parts were mixed and beaten on the front and back layers to obtain a pulp slurry having a Canadian standard freeness of 475 ml. For 100 parts of the obtained pulp slurry, 0.75 parts (in terms of solid content) of polyacrylamide (manufactured by Seiko PMC, DS4326) as an internal paper strength enhancer, and emulsion sizing agent (Seiko PMC Co., Ltd.) as an internal sizing agent Manufactured by AL-1200) 0.65 part and aluminum sulfate 0.8 part were added respectively to prepare a paper stock for front and back layers. In the middle layer, 65 parts of NBKP and 35 parts of LBKP were mixed and beaten to obtain a pulp slurry having a Canadian standard freeness of 450 ml. For 100 parts of the obtained pulp slurry, 0.2 part of polyacrylamide (manufactured by Seiko PMC, DS4326) is used as an internal paper strength enhancer, and emulsion sizing agent (manufactured by Seiko PMC, AL-) is used as an internal sizing agent. 1200) 0.4 parts, 0.4 parts of aluminum sulfate, 0.14 parts of bulk improver (manufactured by Arakawa Chemical Industry Co., Ltd., size pine DL-FA20) as a softening agent was added to prepare a stock for the middle layer. .
The front and back layers each 50 g / m 2 using these a stock, paper making a three-layer structure of the intermediate layer 200 g / m 2, subjected to a smoothing process in the installed calender in a paper machine, basis weight 300 g / m 2 A density of 0.805 g / cm 3 and a smoother of 66 kPa were obtained for a paper liquid container substrate. The paper quality of the obtained base material for paper liquid containers was measured. The interlayer strength was 921 kPa, the breaking elongation in the paper flow direction was 2.84%, the stiffness in the paper flow direction was 16.6 mN · m, and the high temperature size was 0. 0.1 mm.
実施例４
表裏層のパルプ配合をＬＢＫＰ１００部としたこと以外は実施例３と同様にして、坪量３００ｇ／ｍ２、密度０．７７ｇ／ｃｍ３、スムースターが５８ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９１９ｋＰａ、紙の流れ方向の破断伸びが２．７６％、紙の流れ方向の剛度が１６．５ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 4
A substrate for a paper liquid container having a basis weight of 300 g / m 2 , a density of 0.77 g / cm 3 , and a smoother of 58 kPa is obtained in the same manner as in Example 3 except that the front and back layer pulp composition is 100 parts LBKP. It was. The paper quality of the obtained paper liquid container base material was measured. The interlayer strength was 919 kPa, the breaking elongation in the paper flow direction was 2.76%, the stiffness in the paper flow direction was 16.5 mN · m, and the high temperature size was 0. 0.1 mm.
実施例５
中層のパルプ配合をＮＢＫＰ５０部、ＬＢＫＰ５０部としたこと以外は実施例３と同様にして、坪量３００ｇ／ｍ２、密度０．７５ｇ／ｃｍ３、スムースターが６４ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７６２ｋＰａ、紙の流れ方向の破断伸びが２．６９％、紙の流れ方向の剛度が１５．４ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 5
Substrate for paper liquid container having a basis weight of 300 g / m 2 , a density of 0.75 g / cm 3 , and a smoother of 64 kPa, except that the middle layer pulp composition was NBKP 50 parts and LBKP 50 parts. Got. The paper quality of the obtained base material for paper liquid containers was measured. The interlayer strength was 762 kPa, the breaking elongation in the paper flow direction was 2.69%, the stiffness in the paper flow direction was 15.4 mN · m, and the high temperature size was 0. 0.1 mm.
実施例６
中層のパルプ配合をＮＢＫＰ７５部、ＬＢＫＰ２５部としたこと以外は実施例３と同様にして、坪量３００ｇ／ｍ２、密度０．８５ｇ／ｃｍ３、スムースターが６５ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度１１２２ｋＰａ、紙の流れ方向の破断伸びが２．９１％、紙の流れ方向の剛度が１７．０ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 6
Substrate for paper liquid container having a basis weight of 300 g / m 2 , a density of 0.85 g / cm 3 , and a smoother of 65 kPa, except that the middle layer pulp composition is 75 parts NBKP and 25 parts LBKP. Got. The paper quality of the obtained base material for paper liquid containers was measured. The interlayer strength was 1122 kPa, the breaking elongation in the paper flow direction was 2.91%, the stiffness in the paper flow direction was 17.0 mN · m, and the high temperature size was 0. 0.1 mm.
実施例７
表裏層のカナダ標準濾水度を５００ｍｌ、中層のカナダ標準濾水度を４８０ｍｌとした以外は実施例３と同様にして、坪量３００ｇ／ｍ２、密度０．７７ｇ／ｃｍ３、スムースターが６９ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８２８ｋＰａ、紙の流れ方向の破断伸びが２．１２％、紙の流れ方向の剛度が１６．２ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 7
The basis weight is 300 g / m 2 , the density is 0.77 g / cm 3 , and the smoother is used except that the Canadian standard freeness of the front and back layers is 500 ml and the Canadian standard freeness of the middle layer is 480 ml. A 69 kPa paper liquid container base material was obtained. The paper quality of the obtained paper liquid container substrate was measured. The interlayer strength was 828 kPa, the breaking elongation in the paper flow direction was 2.12%, the stiffness in the paper flow direction was 16.2 mN · m, and the high temperature size was 0. 0.1 mm.
実施例８
坪量を３８５ｇ／ｍ２とした以外は実施例１と同様にして、坪量３８５ｇ／ｍ２、密度０．８３５ｇ／ｃｍ３、スムースターが６７ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８６５ｋＰａ、紙の流れ方向の破断伸びが２．５１％、紙の流れ方向の剛度が３０ｍＮ・ｍ、高温サイズが１．８ｍｍであった。
Example 8
Except that the basis weight and 385 g / m 2 in the same manner as in Example 1, basis weight 385 g / m 2, a density 0.835 g / cm 3, smoother to obtain a paper liquid container substrate 67 kPa. The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 865 kPa, the breaking elongation in the paper flow direction was 2.51%, the stiffness in the paper flow direction was 30 mN · m, and the high temperature size was 1.8 mm. Met.
実施例９
坪量を３８５ｇ／ｍ２とした以外は実施例３と同様にして、坪量３８５ｇ／ｍ２、密度０．８０ｇ／ｃｍ３、スムースターが６６ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９３０ｋＰａ、紙の流れ方向の破断伸びが２．８１％、紙の流れ方向の剛度が３１ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 9
Except that the basis weight and 385 g / m 2 in the same manner as in Example 3, a basis weight of 385 g / m 2, a density 0.80 g / cm 3, smoother to obtain a paper liquid container substrate 66 kPa. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 930 kPa, the breaking elongation in the paper flow direction was 2.81%, the stiffness in the paper flow direction was 31 mN · m, and the high temperature size was 0.1 mm. Met.
実施例１０
坪量を３８５ｇ／ｍ２とした以外は実施例４と同様にして、坪量３８５ｇ／ｍ２、密度０．７７ｇ／ｃｍ３、スムースターが５７ｋＰａの紙製液体容器用基材得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９３０ｋＰａ、紙の流れ方向の破断伸びが２．７５％、紙の流れ方向の剛度が３１ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 10
Except that the basis weight and 385 g / m 2 in the same manner as in Example 4, a basis weight of 385 g / m 2, a density 0.77 g / cm 3, smoother to obtain paper liquid container substrate 57KPa. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 930 kPa, the breaking elongation in the paper flow direction was 2.75%, the stiffness in the paper flow direction was 31 mN · m, and the high temperature size was 0.1 mm. Met.
実施例１１
坪量を３８５ｇ／ｍ２とした以外は実施例５と同様にして、坪量３８５ｇ／ｍ２、密度０．７５ｇ／ｃｍ３、スムースターが６３ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７７０ｋＰａ、紙の流れ方向の破断伸びが２．６６％、紙の流れ方向の剛度が３０．５ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 11
Except that the basis weight and 385 g / m 2 in the same manner as in Example 5, the basis weight 385 g / m 2, a density 0.75 g / cm 3, smoother to obtain a paper liquid container substrate 63KPa. The paper quality of the obtained base material for paper liquid containers was measured. The interlayer strength was 770 kPa, the breaking elongation in the paper flow direction was 2.66%, the stiffness in the paper flow direction was 30.5 mN · m, and the high temperature size was 0. 0.1 mm.
実施例１２
坪量を３８５ｇ／ｍ２とした以外は実施例６と同様にして、坪量３８５ｇ／ｍ２、密度０．８４５ｇ／ｃｍ３、スムースターが６４ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度１１４０ｋＰａ、紙の流れ方向の破断伸びが２．８８％、紙の流れ方向の剛度が３２ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 12
Except that the basis weight and 385 g / m 2 in the same manner as in Example 6, a basis weight of 385 g / m 2, a density 0.845 g / cm 3, smoother to obtain a paper liquid container substrate 64KPa. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 1140 kPa, the breaking elongation in the paper flow direction was 2.88%, the stiffness in the paper flow direction was 32 mN · m, and the high temperature size was 0.1 mm. Met.
実施例１３
坪量を３８５ｇ／ｍ２とした以外は実施例７と同様にして、坪量３８５ｇ／ｍ２、密度０．７６５ｇ／ｃｍ３、スムースターが６８ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８３５ｋＰａ、紙の流れ方向の破断伸びが２．０９％、紙の流れ方向の剛度が３１．５ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 13
Except that the basis weight and 385 g / m 2 in the same manner as in Example 7, basis weight 385 g / m 2, a density 0.765 g / cm 3, smoother to obtain a paper liquid container substrate 68 kPa. The paper quality of the obtained base material for paper liquid containers was measured. The interlayer strength was 835 kPa, the breaking elongation in the paper flow direction was 2.09%, the stiffness in the paper flow direction was 31.5 mN · m, and the high temperature size was 0. 0.1 mm.
実施例１４
坪量を４８１ｇ／ｍ２とした以外は実施例１と同様にして、坪量４８１ｇ／ｍ２、密度０．８３ｇ／ｃｍ３、スムースターが６６ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９００ｋＰａ、紙の流れ方向の破断伸びが２．４８％、紙の流れ方向の剛度が５４ｍＮ・ｍ、高温サイズが１．８ｍｍであった。
Example 14
Except that the basis weight and 481 g / m 2 in the same manner as in Example 1, basis weight 481 g / m 2, a density 0.83 g / cm 3, smoother to obtain a paper liquid container substrate 66 kPa. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 900 kPa, the breaking elongation in the paper flow direction was 2.48%, the stiffness in the paper flow direction was 54 mN · m, and the high temperature size was 1.8 mm. Met.
実施例１５
坪量を４８１ｇ／ｍ２とした以外は実施例３と同様にして、坪量４８１ｇ／ｍ２、密度０．７９５ｇ／ｃｍ３、スムースターが６５ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９６０ｋＰａ、紙の流れ方向の破断伸びが２．７７％、紙の流れ方向の剛度が５６ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 15
Except that the basis weight and 481 g / m 2 in the same manner as in Example 3, a basis weight of 481 g / m 2, a density 0.795 g / cm 3, smoother to obtain a paper liquid container substrate 65 kPa. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 960 kPa, the breaking elongation in the paper flow direction was 2.77%, the stiffness in the paper flow direction was 56 mN · m, and the high temperature size was 0.1 mm. Met.
実施例１６
坪量を４８１ｇ／ｍ２とした以外は実施例４と同様にして、坪量４８１ｇ／ｍ２、密度０．７６ｇ／ｃｍ３、スムースターが５５ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９６６ｋＰａ、紙の流れ方向の破断伸びが２．７％、紙の流れ方向の剛度が５６ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 16
Except that the basis weight and 481 g / m 2 in the same manner as in Example 4, a basis weight of 481 g / m 2, a density 0.76 g / cm 3, smoother to obtain a paper liquid container substrate 55 kPa. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 966 kPa, the breaking elongation in the paper flow direction was 2.7%, the stiffness in the paper flow direction was 56 mN · m, and the high temperature size was 0.1 mm. Met.
実施例１７
坪量を４８１ｇ／ｍ２とした以外は実施例５と同様にして、坪量４８１ｇ／ｍ２、密度０．７５ｇ／ｃｍ３、スムースターが６２ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８１０ｋＰａ、紙の流れ方向の破断伸びが２．６５％、紙の流れ方向の剛度が５５ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 17
Except that the basis weight and 481 g / m 2 in the same manner as in Example 5, the basis weight 481 g / m 2, a density 0.75 g / cm 3, smoother to obtain a paper liquid container substrate 62KPa. The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 810 kPa, the breaking elongation in the paper flow direction was 2.65%, the stiffness in the paper flow direction was 55 mN · m, and the high temperature size was 0.1 mm. Met.
実施例１８
坪量を４８１ｇ／ｍ２とした以外は実施例６と同様にして、坪量４８１ｇ／ｍ２、密度０．８４ｇ／ｃｍ３、スムースターが６３ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度１２００ｋＰａ、紙の流れ方向の破断伸びが２．８３％、紙の流れ方向の剛度が５６．５ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 18
Except that the basis weight and 481 g / m 2 in the same manner as in Example 6, a basis weight of 481 g / m 2, a density 0.84 g / cm 3, smoother to obtain a paper liquid container substrate 63KPa. The paper quality of the obtained paper liquid container base material was measured. The interlayer strength was 1200 kPa, the breaking elongation in the paper flow direction was 2.83%, the stiffness in the paper flow direction was 56.5 mN · m, and the high temperature size was 0. 0.1 mm.
実施例１９
坪量を４８１ｇ／ｍ２とした以外は実施例７と同様にして、坪量４８１ｇ／ｍ２、密度０．７６ｇ／ｃｍ３、スムースターが６６ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８７０ｋＰａ、紙の流れ方向の破断伸びが２．０５％、紙の流れ方向の剛度が５６ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Example 19
Except that the basis weight and 481 g / m 2 in the same manner as in Example 7, basis weight 481 g / m 2, a density 0.76 g / cm 3, smoother to obtain a paper liquid container substrate 66 kPa. The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 870 kPa, the breaking elongation in the paper flow direction was 2.05%, the stiffness in the paper flow direction was 56 mN · m, and the high temperature size was 0.1 mm. Met.
比較例１
表裏層のパルプ配合をＮＢＫＰ５０部、ＬＢＫＰ５０部とした以外は実施例３と同様にして、坪量３００ｇ／ｍ２、密度０．８３５ｇ／ｃｍ３、スムースターが７３ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９２５ｋＰａ、紙の流れ方向の破断伸びが２．８５％、紙の流れ方向の剛度が１６．７ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 1
Substrate for paper liquid container with basis weight of 300 g / m 2 , density of 0.835 g / cm 3 , and smoother of 73 kPa, except that NBKP 50 parts and LBKP 50 parts were used for the front and back layers. Got. The paper quality of the obtained base material for paper liquid containers was measured. The interlayer strength was 925 kPa, the breaking elongation in the paper flow direction was 2.85%, the stiffness in the paper flow direction was 16.7 mN · m, and the high temperature size was 0. 0.1 mm.
比較例２
中層のパルプ配合をＮＢＫＰ４５部、ＬＢＫＰ５５部とした以外は実施例３と同様にして、坪量３００ｇ／ｍ２、密度０．７４ｇ／ｃｍ３、スムースターが６６ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７３０ｋＰａ、紙の流れ方向の破断伸びが２．６７％、紙の流れ方向の剛度が１５．５ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 2
A base material for a paper liquid container having a basis weight of 300 g / m 2 , a density of 0.74 g / cm 3 , and a smoother of 66 kPa, except that the middle layer pulp composition is 45 parts NBKP and 55 parts LBKP. Obtained. The paper quality of the obtained base material for paper liquid containers was measured. The interlayer strength was 730 kPa, the breaking elongation in the paper flow direction was 2.67%, the stiffness in the paper flow direction was 15.5 mN · m, and the high temperature size was 0. 0.1 mm.
比較例３
中層のパルプ配合をＮＢＫＰ８０部、ＬＢＫＰ２０部とした以外は実施例３と同様にして、坪量３００ｇ／ｍ２、密度０．８６５ｇ／ｃｍ３、スムースターが６９ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度１１６０ｋＰａ、紙の流れ方向の破断伸びが２．９％、紙の流れ方向の剛度が１７．２ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 3
A base material for a paper liquid container having a basis weight of 300 g / m 2 , a density of 0.865 g / cm 3 , and a smoother of 69 kPa is used except that the middle layer pulp composition is 80 parts NBKP and 20 parts LBKP. Obtained. The paper quality of the obtained base material for paper liquid containers was measured. The interlayer strength was 1160 kPa, the breaking elongation in the paper flow direction was 2.9%, the stiffness in the paper flow direction was 17.2 mN · m, and the high temperature size was 0. 0.1 mm.
比較例４
表裏層のカナダ標準濾水度を５２０ｍｌ、中層のカナダ標準濾水度を５００ｍｌとした以外は実施例３と同様にして、坪量３００ｇ／ｍ２、密度０．７２ｇ／ｃｍ３、スムースターが８２ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７４１ｋＰａ、紙の流れ方向の破断伸びが１．８４％、紙の流れ方向の剛度が１４．８ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 4
The basis weight is 300 g / m 2 , the density is 0.72 g / cm 3 , and the smoother is used except that the Canadian standard freeness of the front and back layers is 520 ml and the Canadian standard freeness of the middle layer is 500 ml. An 82 kPa paper liquid container substrate was obtained. The paper quality of the obtained paper liquid container base material was measured. The interlayer strength was 741 kPa, the breaking elongation in the paper flow direction was 1.84%, the stiffness in the paper flow direction was 14.8 mN · m, and the high temperature size was 0. 0.1 mm.
比較例５
嵩向上剤を０．４２部添加した以外は実施例２と同様にして、坪量３００ｇ／ｍ２、密度０．８０５ｇ／ｃｍ３、スムースターが６５ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７４５ｋＰａ、紙の流れ方向の破断伸びが１．９８％、紙の流れ方向の剛度が１４．８ｍＮ・ｍ、高温サイズが２．５ｍｍであった。
Comparative Example 5
A substrate for paper liquid containers having a basis weight of 300 g / m 2 , a density of 0.805 g / cm 3 , and a smoother of 65 kPa was obtained in the same manner as in Example 2 except that 0.42 part of the bulk improver was added. . The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 745 kPa, the breaking elongation in the paper flow direction was 1.98%, the stiffness in the paper flow direction was 14.8 mN · m, and the high temperature size was 2 0.5 mm.
比較例６
表裏層のパルプ配合をＮＢＫＰ５０部、ＬＢＫＰ５０部とした以外は実施例９と同様にして、坪量３８５ｇ／ｍ２、密度０．８３ｇ／ｃｍ３、スムースターが７２ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９３９ｋＰａ、紙の流れ方向の破断伸びが２．８１％、紙の流れ方向の剛度が３１ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 6
A base material for paper liquid containers having a basis weight of 385 g / m 2 , a density of 0.83 g / cm 3 , and a smoother of 72 kPa, except that the front and back layer pulp composition is NBKP 50 parts and LBKP 50 parts. Got. The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 939 kPa, the breaking elongation in the paper flow direction was 2.81%, the stiffness in the paper flow direction was 31 mN · m, and the high temperature size was 0.1 mm. Met.
比較例７
中層のパルプ配合をＮＢＫＰ４５部、ＬＢＫＰ５５部とした以外は実施例９と同様にして、坪量３８５ｇ／ｍ２、密度０．７３７ｇ／ｃｍ３、スムースターが６５ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７４０ｋＰａ、紙の流れ方向の破断伸びが２．６１％、紙の流れ方向の剛度が３０ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 7
A base material for a paper liquid container having a basis weight of 385 g / m 2 , a density of 0.737 g / cm 3 , and a smoother of 65 kPa is used except that the middle layer pulp composition is 45 parts NBKP and 55 parts LBKP. Obtained. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 740 kPa, the breaking elongation in the paper flow direction was 2.61%, the stiffness in the paper flow direction was 30 mN · m, and the high temperature size was 0.1 mm. Met.
比較例８
中層のパルプ配合をＮＢＫＰ８０部、ＬＢＫＰ２０部とした以外は実施例９と同様にして、坪量３８５ｇ／ｍ２、密度０．８６ｇ／ｃｍ３、スムースターが６８ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度１２００ｋＰａ、紙の流れ方向の破断伸びが２．８３％、紙の流れ方向の剛度が３２ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 8
A substrate for a paper liquid container having a basis weight of 385 g / m 2 , a density of 0.86 g / cm 3 , and a smoother of 68 kPa, except that the middle layer pulp composition is 80 parts NBKP and 20 parts LBKP. Obtained. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 1200 kPa, the breaking elongation in the paper flow direction was 2.83%, the stiffness in the paper flow direction was 32 mN · m, and the high temperature size was 0.1 mm. Met.
比較例９
表裏層のカナダ標準濾水度を５２０ｍｌ、中層のカナダ標準濾水度を５００ｍｌとした以外は実施例９と同様にして、坪量３８５ｇ／ｍ２、密度０．７１４ｇ／ｃｍ３、スムースターが８０ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７７０ｋＰａ、紙の流れ方向の破断伸びが１．７９％、紙の流れ方向の剛度が２９ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 9
A basis weight of 385 g / m 2 , a density of 0.714 g / cm 3 , and a smoother were used except that the Canadian standard freeness of the front and back layers was 520 ml and the Canadian standard freeness of the middle layer was 500 ml. A substrate for a paper liquid container of 80 kPa was obtained. The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 770 kPa, the breaking elongation in the paper flow direction was 1.79%, the stiffness in the paper flow direction was 29 mN · m, and the high temperature size was 0.1 mm. Met.
比較例１０
嵩向上剤を０．４２部添加した以外は実施例９と同様にして、坪量３８５ｇ／ｍ２、密度０．８０５ｇ／ｃｍ３、スムースターが６４ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７７５ｋＰａ、紙の流れ方向の破断伸びが１．９４％、紙の流れ方向の剛度が２９ｍＮ・ｍ、高温サイズが２．５ｍｍであった。
Comparative Example 10
A substrate for paper liquid containers having a basis weight of 385 g / m 2 , a density of 0.805 g / cm 3 , and a smoother of 64 kPa was obtained except that 0.42 part of the bulk improver was added. . The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 775 kPa, the breaking elongation in the paper flow direction was 1.94%, the stiffness in the paper flow direction was 29 mN · m, and the high temperature size was 2.5 mm. Met.
比較例１１
表裏層のパルプ配合をＮＢＫＰ５０部、ＬＢＫＰ５０部とした以外は実施例１５と同様にして、坪量４８１ｇ／ｍ２、密度０．８３ｇ／ｃｍ３、スムースターが７１ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度９６０ｋＰａ、紙の流れ方向の破断伸びが２．７６％、紙の流れ方向の剛度が５６ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 11
Substrate for paper liquid container with basis weight of 481 g / m 2 , density of 0.83 g / cm 3 , and smoother of 71 kPa, except that NBKP 50 parts and LBKP 50 parts were used for the front and back layers. Got. The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 960 kPa, the breaking elongation in the paper flow direction was 2.76%, the stiffness in the paper flow direction was 56 mN · m, and the high temperature size was 0.1 mm. Met.
比較例１２
中層のパルプ配合をＮＢＫＰ４５部、ＬＢＫＰ５５部とした以外は実施例１５と同様にして、坪量４８１ｇ／ｍ２、密度０．７３３ｇ／ｃｍ３、スムースターが６４ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度７４８ｋＰａ、紙の流れ方向の破断伸びが２．５８％、紙の流れ方向の剛度が５５ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 12
A base material for a paper liquid container having a basis weight of 481 g / m 2 , a density of 0.733 g / cm 3 , and a smoother of 64 kPa was used except that the middle layer pulp composition was 45 parts NBKP and 55 parts LBKP. Obtained. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 748 kPa, the breaking elongation in the paper flow direction was 2.58%, the stiffness in the paper flow direction was 55 mN · m, and the high temperature size was 0.1 mm. Met.
比較例１３
中層のパルプ配合をＮＢＫＰ８０部、ＬＢＫＰ２０部とした以外は実施例１５と同様にして、坪量４８１ｇ／ｍ２、密度０．８５６ｇ／ｃｍ３、スムースターが６７ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度１２５０ｋＰａ、紙の流れ方向の破断伸びが２．８％、紙の流れ方向の剛度が５８ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 13
A base material for a paper liquid container having a basis weight of 481 g / m 2 , a density of 0.856 g / cm 3 , and a smoother of 67 kPa was used except that the middle layer pulp formulation was 80 parts NBKP and 20 parts LBKP. Obtained. The paper quality of the obtained paper liquid container substrate was measured, the interlayer strength was 1250 kPa, the breaking elongation in the paper flow direction was 2.8%, the stiffness in the paper flow direction was 58 mN · m, and the high temperature size was 0.1 mm. Met.
比較例１４
表裏層のカナダ標準濾水度を５２０ｍｌ、中層のカナダ標準濾水度を５００ｍｌとした以外は実施例１５と同様にして、坪量４８１ｇ／ｍ２、密度０．７１ｇ／ｃｍ３、スムースターが７９ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８００ｋＰａ、紙の流れ方向の破断伸びが１．７４％、紙の流れ方向の剛度が５３ｍＮ・ｍ、高温サイズが０．１ｍｍであった。
Comparative Example 14
The basis weight is 481 g / m 2 , the density is 0.71 g / cm 3 , and the smoother is the same as in Example 15 except that the Canadian standard freeness of the front and back layers is 520 ml and the Canadian standard freeness of the middle layer is 500 ml. A substrate for a paper liquid container of 79 kPa was obtained. The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 800 kPa, the breaking elongation in the paper flow direction was 1.74%, the stiffness in the paper flow direction was 53 mN · m, and the high temperature size was 0.1 mm. Met.
比較例１５
嵩向上剤を０．４２部添加した以外は実施例９と同様にして、坪量４８１ｇ／ｍ２、密度０．８０ｇ／ｃｍ３、スムースターが６３ｋＰａの紙製液体容器用基材を得た。得られた紙製液体容器用基材の紙質を測定し、層間強度８０７ｋＰａ、紙の流れ方向の破断伸びが１．９％、紙の流れ方向の剛度が５３ｍＮ・ｍ、高温サイズが２．５ｍｍであった。
Comparative Example 15
A substrate for a paper liquid container having a basis weight of 481 g / m 2 , a density of 0.80 g / cm 3 , and a smoother of 63 kPa was obtained in the same manner as in Example 9 except that 0.42 part of the bulk improver was added. . The paper quality of the obtained base material for paper liquid containers was measured, the interlayer strength was 807 kPa, the breaking elongation in the paper flow direction was 1.9%, the stiffness in the paper flow direction was 53 mN · m, and the high temperature size was 2.5 mm. Met.
各実施例および比較例で得られた印刷用紙についてまとめ、また、以下に示す、密度、成形性、平滑度、グラビア印刷評価、層間強度、破断伸び、高温サイズ、剛度を評価した。その結果を表１に示す。 The printing paper obtained in each Example and Comparative Example was summarized, and the density, formability, smoothness, gravure printing evaluation, interlayer strength, elongation at break, high temperature size, and rigidity shown below were evaluated. The results are shown in Table 1.
＜紙の密度＞
ＪＩＳ Ｐ ８１１８により測定した。
<Density of paper>
It was measured according to JIS P 8118.
＜成形性＞
紙製液体容器用基材を屋根型の形に打ち抜き、８．５×８．５×２５．３ｃｍの内容量が１８００ｍｌの屋根型液体容器を作成し、成形性について評価した。
◎：成形性が非常に良好であり、実用上全く問題ない。
○：成形性が良好であり、実用上問題ない。
△：成形性がやや劣り、実用上問題ある。
×：成形性が著しく劣り、実用上問題である。
<Moldability>
A paper liquid container base material was punched into a roof shape, and a roof type liquid container having an inner volume of 8.5 × 8.5 × 25.3 cm and an internal capacity of 1800 ml was prepared, and the moldability was evaluated.
A: The moldability is very good and there is no problem in practical use.
○: Formability is good and there is no practical problem.
Δ: Slightly inferior in formability and practically problematic
X: Formability is remarkably inferior, which is a practical problem.
＜平滑度＞
ＪＡＰＡＮ ＴＡＰＰＩ 紙・パルプ試験方法Ｎｏ．５−１記載のスムースター法に従って測定した。
<Smoothness>
JAPAN TAPPI Paper / Pulp Test Method No. It was measured according to the smooth star method described in 5-1.
＜グラビア印刷評価＞
オリエント総業社製ＯＳＧ−５５０ＨＤＸを用い、大日本インキ化学工業社製サンビュアーＷ−１０墨、紅、藍、黄４色でグラビア印刷を行い、その結果を評価表示した。
◎：白抜けが非常に少なく、実用上問題なく、品質が優れている。
○：白抜けが少なく、実用上問題ない。
△：白抜けがやや劣り、実用上問題ある。
×：白抜けが著しく劣り、実用上問題であり、品質も著しく劣っている。
<Evaluation of gravure printing>
Using OSG-550HDX manufactured by Orient Sogyo Co., Ltd., gravure printing was performed with Sunviewer W-10 black, red, indigo and yellow of Dainippon Ink & Chemicals, Inc., and the results were evaluated and displayed.
A: There are very few white spots, no practical problems, and excellent quality.
○: There are few white spots and there is no practical problem.
Δ: Slightly inferior white spots and practical problems.
X: The white spot is remarkably inferior, it is a practical problem, and the quality is remarkably inferior
＜層間強度＞
ＴＡＰＰＩ ＵＭ−５２２に従って測定した。
<Interlayer strength>
Measured according to TAPPI UM-522.
＜破断伸び＞
ＪＩＳ Ｐ ８１１３記載の方法で測定した。
<Elongation at break>
It was measured by the method described in JIS P8113.
＜高温サイズ＞
明光商会製 ＭＳパウチを用いて、紙製液体容器用基材の表裏両面にＭＳパウチ専用フィルムを貼り合わせラミネートし表裏面からの吸水のない状態にした後、紙製液体容器用基材の断面が露出するように縦（紙の流れ方向）６ｃｍ、横（紙の流れ方向と直角）３ｃｍにカットする。次に７０℃に熱した３％食紅水溶液にラミネート処理した紙製液体容器用基材を１０分間浸漬し、断面からの吸水を計測し高温サイズとして評価した。
<High temperature size>
Using MS pouch made by Meikoshokai, the MS pouch dedicated film is laminated on both the front and back sides of the paper liquid container base material to make it absorb no water from the front and back surfaces, and then the cross section of the paper liquid container base material Is cut into 6 cm in the vertical direction (paper flow direction) and 3 cm in the horizontal direction (perpendicular to the paper flow direction). Next, the base material for paper liquid containers laminated with a 3% red food solution heated to 70 ° C. was immersed for 10 minutes, and the water absorption from the cross section was measured and evaluated as a high temperature size.
＜剛度＞
ＪＩＳ Ｐ ８１２５記載の方法で測定した。
<Stiffness>
It was measured by the method described in JIS P 8125.
Claims (6)
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| JP2012213316A JP2014065991A (en) | 2012-09-27 | 2012-09-27 | Base material for paper liquid container |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017002433A (en) * | 2015-06-11 | 2017-01-05 | 王子ホールディングス株式会社 | Paper base material |
| JP2019108627A (en) * | 2017-12-19 | 2019-07-04 | 王子ホールディングス株式会社 | Paper base material for foamed heat-insulating paper container, sheet for foamed heat-insulating paper container, and heat-insulating paper container |
| JP2020094316A (en) * | 2018-11-30 | 2020-06-18 | 王子ホールディングス株式会社 | Laminate paper, paper substrate for laminate paper, paper container and manufacturing methods thereof |
| JP2020104309A (en) * | 2018-12-26 | 2020-07-09 | 王子ホールディングス株式会社 | Foam insulation paper container base material, foam insulation paper container sheet and foam insulation paper container |
| JP2020133079A (en) * | 2019-02-26 | 2020-08-31 | 日本製紙株式会社 | Multilayer board paper and manufacturing method thereof |
| WO2021131949A1 (en) * | 2019-12-24 | 2021-07-01 | 王子ホールディングス株式会社 | Laminated paper and paper container for liquids employing same |
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| JPH08310522A (en) * | 1995-05-15 | 1996-11-26 | Tokyo Seishi Kk | Paper container |
| JP2001271296A (en) * | 2000-03-17 | 2001-10-02 | Mitsubishi Paper Mills Ltd | Coated white board and method of producing the same |
| JP2004017447A (en) * | 2002-06-14 | 2004-01-22 | Dainippon Printing Co Ltd | Laminate for paper container and paper container using the same |
| JP2010144286A (en) * | 2008-12-19 | 2010-07-01 | Oji Paper Co Ltd | Paper base material for liquid container |
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| JPH08199496A (en) * | 1995-01-20 | 1996-08-06 | Mitsubishi Paper Mills Ltd | Production of coated paper for mat gravure |
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| JP2001271296A (en) * | 2000-03-17 | 2001-10-02 | Mitsubishi Paper Mills Ltd | Coated white board and method of producing the same |
| JP2004017447A (en) * | 2002-06-14 | 2004-01-22 | Dainippon Printing Co Ltd | Laminate for paper container and paper container using the same |
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|---|---|---|---|---|
| JP2017002433A (en) * | 2015-06-11 | 2017-01-05 | 王子ホールディングス株式会社 | Paper base material |
| JP2019108627A (en) * | 2017-12-19 | 2019-07-04 | 王子ホールディングス株式会社 | Paper base material for foamed heat-insulating paper container, sheet for foamed heat-insulating paper container, and heat-insulating paper container |
| JP2020094316A (en) * | 2018-11-30 | 2020-06-18 | 王子ホールディングス株式会社 | Laminate paper, paper substrate for laminate paper, paper container and manufacturing methods thereof |
| JP2020104309A (en) * | 2018-12-26 | 2020-07-09 | 王子ホールディングス株式会社 | Foam insulation paper container base material, foam insulation paper container sheet and foam insulation paper container |
| JP2020133079A (en) * | 2019-02-26 | 2020-08-31 | 日本製紙株式会社 | Multilayer board paper and manufacturing method thereof |
| JP7260328B2 (en) | 2019-02-26 | 2023-04-18 | 日本製紙株式会社 | Multilayer paperboard and method for producing same |
| WO2021131949A1 (en) * | 2019-12-24 | 2021-07-01 | 王子ホールディングス株式会社 | Laminated paper and paper container for liquids employing same |
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