JP6502741B2 - Multilayer paper and method for producing multilayer paper - Google Patents
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Description
本発明は、多層紙及びその製造方法に関する。 The present invention relates to a multilayer paper and a method of manufacturing the same.
一般に紙は、大きく紙と板紙とに分類される。後者の用途には様々なものがあるが、段ボールの原紙となるライナーや中芯原紙と呼ばれるものもその一つである。板紙はその使用用途から、紙と比べて強度を求められる場合が多い。 Generally, paper is roughly classified into paper and paperboard. There are various types of applications for the latter, but liners and core base papers, which serve as base materials for corrugated cardboard, are one of them. Paperboard is often required to be stronger than paper due to its use.
板紙に求められる強度として、破裂強度や曲げこわさが挙げられる。例えば、こわさを向上させるために、増斤や、特定の表面処理剤を使用する技術（特許文献１：特開２０００−６４１９３号公報）、抄紙設備やパルプ原料の面から紙層構造の改良を図る技術（特許文献２：特開平３−２２７５００号公報、特許文献３：特開平４−３６１６８６号公報）等が提案されている。 Bursting strength and bending stiffness are mentioned as strength required for paperboard. For example, in order to improve stiffness, a technique of using a specific surface treatment agent (Japanese Patent Laid-Open No. 2000-64193), improvement of paper layer structure from the viewpoint of paper making equipment and pulp raw material Technologies (Patent Document 2: Japanese Patent Application Laid-Open No. 3-227500, Patent Document 3: Japanese Patent Application Laid-Open No. 4-361686) and the like have been proposed.
また従来から、繊維配向の度合（繊維配向比）が強度特性に大きく影響することが知られている。例えば、ＭＤ方向の引張強度、曲げこわさ、破裂強度等を高くするためには、ＭＤ方向の繊維配向比を高く、つまりＭＤ方向を向く繊維の割合を多くすることが有効である。また、ＣＤ方向の引張強度、曲げこわさ等を高くするには、逆にＭＤ方向の繊維配向比を低くすることが有効である。従って、繊維配向の面から破裂強度とＣＤ方向の曲げこわさを両立することは難しいといえる。 In addition, it is known that the degree of fiber orientation (fiber orientation ratio) greatly affects the strength characteristics. For example, in order to increase tensile strength, bending stiffness, burst strength, etc. in the MD direction, it is effective to increase the fiber orientation ratio in the MD direction, that is, to increase the proportion of fibers oriented in the MD direction. Further, in order to increase the tensile strength in the CD direction, the bending stiffness and the like, it is effective to lower the fiber orientation ratio in the MD direction. Therefore, it can be said that it is difficult to achieve both burst strength and bending stiffness in the CD direction from the viewpoint of fiber orientation.
多層紙を製造する抄紙機において、ワイヤーに対して直交する向きにヘッドボックスを備え、ワイヤーの走行方向に対して直角に紙料を吐出して各層の配向角を異なるようにし、吸湿や乾燥状態での伸縮の異方性が少なく、低坪量であっても折り曲げ強度や引裂き強度等の紙強度に優れた多層紙、及び抄紙機上で当該多層紙を抄紙する方法が提案されている（特許文献４：特開２００３−２１３５９９号公報）。 In a paper machine for producing multi-layered paper, a head box is provided in the direction orthogonal to the wire, and the stock is discharged perpendicularly to the traveling direction of the wire to make the orientation angle of each layer different, to absorb moisture or dry There has been proposed a multilayer paper which is less anisotropic in expansion and contraction at a low basis weight and is excellent in paper strength such as bending strength and tear strength even at a low basis weight, and a method of making the multilayer paper on a paper machine Patent document 4: Unexamined-Japanese-Patent No. 2003-213599).
再生パルプを含有する多層紙において、すべての層の繊維配向比をマシン全幅にわたり一定の範囲とする技術も提案されている（特許文献５：特開２０１２−２１４９５４号公報）。当該技術は寸法安定性の差を少なくすることが課題であり、これを幅方向の繊維配向比のバラつきを制御することで解決する。 In multilayer paper containing recycled pulp, a technique has also been proposed in which the fiber orientation ratio of all layers is in a certain range over the entire machine width (Patent Document 5: Japanese Patent Application Laid-Open No. 2012-214954). It is an object of the art to reduce the difference in dimensional stability, which is solved by controlling the variation in the fiber orientation ratio in the width direction.
段ボール箱の最外表面又は最内表面を形成する表面層、及び中芯（フルート）と接着される面を形成する裏面層の２層以上の層を少なくとも具備し、前記表面層の繊維配向を他の層よりもマシン運転方向（流れ方向）へ強くすることで、段ボール等の各種容器に用いられるライナー紙の罫線割れの発生する率を低くする技術も提案されている（特許文献６：特許第０４２６１９９０号）。本技術では最外層の繊維配向をその他の層よりも強くする。特許文献６及び７の技術は、課題及び解決手段の点において本発明と相違する。 At least two layers of a surface layer forming the outermost surface or the innermost surface of the cardboard box and a back surface layer forming the surface to be bonded to the core (flute), the fiber orientation of the surface layer There is also proposed a technique for reducing the rate of occurrence of creases in the liner paper used for various containers such as cardboard by making the machine operation direction (flow direction) stronger than other layers (Patent Document 6: Patent No. 04261990). In the present technology, the fiber orientation of the outermost layer is made stronger than the other layers. The techniques of Patent Documents 6 and 7 differ from the present invention in terms of problems and solutions.
特許文献１〜４に記載の技術では設備的な対応が必要である、コストアップとなる等の問題があった。特許文献５の技術では抄紙機の改造等が必要であるため、実現が容易ではない。かかる事情を鑑み、本発明は簡便な方法で破裂強度とＣＤ方向の曲げこわさを両立できる多層紙を提供することを課題とする。 The techniques described in Patent Documents 1 to 4 have problems such as the need for equipment-related measures and the increase in cost. The technique of Patent Document 5 requires modification of the paper machine, and so is not easy to realize. In view of such circumstances, it is an object of the present invention to provide a multilayer paper which can achieve both burst strength and bending stiffness in the CD direction by a simple method.
本発明者らは、表層及び裏層の繊維配向比を所定の範囲とし、かつそれ以外の層の繊維配向比を表層及び裏層の繊維配向比よりも高くすることで、破裂強度とＣＤ方向の曲げこわさの両立を達成できることを見出した。すなわち、前記課題は以下の本発明により解決される。
（１）３層以上の抄き合わせにより得られる多層紙であって、表層と裏層を除く層のマイクロ波分子配向度測定で決定される繊維配向比をＭ、表層及び裏層のマイクロ波分子配向度測定で決定される繊維配向比をそれぞれＡ及びＢとするとき、
Ｍ−Ａ及びＭ−Ｂがそれぞれ０．２以上であり、かつ
Ａ及びＢがそれぞれ１．３以下である、多層紙。
（２）紙層全体の坪量に対する表層及び裏層の坪量の割合が、それぞれ５〜２０質量％である（１）に記載の多層紙。
（３）前記（１）に記載の多層紙の製造方法であって、
ワイヤーパート上に紙料を吐出することを含み、かつ
前記Ｍ−Ａ及びＭ−Ｂがそれぞれ０．２以上、Ａ及びＢがそれぞれ１．３以下となるように各層における吐出速度Ｊとワイヤー速度Ｗとの比Ｊ／Ｗを調整することを含む、
製造方法。
The present inventors set the fiber orientation ratio of the surface layer and the back layer to a predetermined range, and set the fiber orientation ratio of the other layers higher than the fiber orientation ratio of the surface layer and the back layer, so that the burst strength and the CD direction It has been found that it is possible to achieve a balance of bending stiffness. That is, the said subject is solved by the following this invention.
(1) A multilayer paper obtained by forming three or more layers, wherein the fiber orientation ratio determined by measuring the degree of molecular orientation of the layers excluding the surface layer and the back layer is M, and the microwaves of the surface layer and the back layer Assuming that the fiber orientation ratio determined by molecular orientation measurement is A and B, respectively
Multilayer paper in which M-A and M-B are each 0.2 or more, and A and B are each 1.3 or less.
(2) The multilayer paper according to (1), wherein the ratio of the basis weight of the surface layer and the back layer to the basis weight of the entire paper layer is 5 to 20% by mass, respectively.
(3) It is a manufacturing method of the multilayer paper as described in said (1), Comprising:
Ejection speed J and wire speed in each layer so as to make the MA and M-B be 0.2 or more and A and B be 1.3 or less, respectively. Including adjusting the ratio J / W with W,
Production method.
本発明により、簡便な方法で破裂強度とＣＤ方向の曲げこわさが両立できる多層紙を提供できる。 According to the present invention, it is possible to provide a multilayer paper in which the burst strength and the bending stiffness in the CD direction can be compatible by a simple method.
１．多層紙
以下、本発明の多層紙を詳細に説明する。本発明において「〜」はその両端の値を含む。すなわち「Ｘ〜Ｙ」との記載はＸとＹを含むことを意味する。
1. Multilayer Paper Hereinafter, the multilayer paper of the present invention will be described in detail. In the present invention, "-" includes the values at both ends thereof. That is, the description of "X to Y" is meant to include X and Y.
（１）構造
本発明の多層紙は、パルプを主原料とした３層以上の多層構造からなり、抄き合せて製造される。本発明の多層紙は、複数のヘッドボックスを備える抄紙機による抄き合わせ、あるいは単一のヘッドボックスのみを備える抄紙機による多層抄きで製造されることが好ましい。積層数は３以上であれば限定されないが、例えば３層の場合は表層／中層／裏層、４層の場合は表層／表下層／裏下層／裏層、５層の場合は表層／表下層／中層／裏下層／裏層からそれぞれ構成される。表層及び裏層以外の層とは、３層の場合は中層を、４層の場合は表下層／裏下層／裏層を、５層の場合は表下層／中層／裏下層／裏層を意味する。
(1) Structure The multilayer paper of the present invention has a multilayer structure of three or more layers mainly composed of pulp, and is produced by paper-making. The multilayer paper of the present invention is preferably produced by papermaking with a paper machine equipped with a plurality of head boxes, or by multilayer paper making with a paper machine equipped with only a single head box. The number of laminated layers is not limited as long as it is three or more, but for example, in the case of three layers, the surface / middle layer / back layer, in the case of four layers, the surface / front lower layer / back lower layer / back layer, and in the case of five layers, surface / front lower layer / Middle layer / back lower layer / back layer The layers other than the surface layer and the back layer mean the middle layer in the case of 3 layers, the front lower layer / back lower layer / back layer in the case of 4 layers, and the front lower layer / middle layer / back lower layer / back layer in the case of 5 layers. Do.
（２）繊維配向比と機械的特性
繊維配向比とは、繊維の配向（配列）の度合を示す尺度であり、数値が大きいほど配列の度合が強いことを示す。特に断りの無い限り、本発明における繊維配向比はＭＤ方向への繊維の配向の度合を意味する。本発明において繊維配向比は層のマイクロ波透過強度から求められ、具体的にはマイクロ波分子配向度測定装置（王子計測器（株）製）により決定される。
(2) Fiber Orientation Ratio and Mechanical Property The fiber orientation ratio is a scale indicating the degree of orientation (arrangement) of fibers, and the larger the numerical value, the stronger the degree of alignment. Unless otherwise noted, the fiber orientation ratio in the present invention means the degree of fiber orientation in the MD direction. In the present invention, the fiber orientation ratio is determined from the microwave transmission intensity of the layer, and specifically, it is determined by a microwave molecular orientation degree measuring apparatus (manufactured by Oji Scientific Instruments Co., Ltd.).
本発明では、表層と裏層を除く層の繊維配向比をＭ、表層及び裏層の繊維配向比をそれぞれＡ及びＢとするとき、Ｍ−Ａ≧０．２、Ｍ−Ｂ≧０．２であり、かつＡ≦１．３、Ｂ≦１．３である。表層と裏層を除く層が複数の層からなる場合は、その積層体をマイクロ波分子配向度測定装置で分析してＭを求める。すなわち４層の多層紙である場合、「表下層」及び「裏下層」の積層体の繊維配向比をＭとする。 In the present invention, when the fiber orientation ratio of the layer excluding the surface layer and the back layer is M, and the fiber orientation ratio of the surface layer and the back layer is A and B, respectively, M−A ≧ 0.2 and M−B ≧ 0.2 And A ≦ 1.3 and B ≦ 1.3. When the layers other than the surface layer and the back layer are composed of a plurality of layers, the laminate is analyzed by a microwave molecular orientation measuring device to obtain M. That is, when it is a multilayer paper of four layers, let the fiber orientation ratio of the laminated body of "front lower layer" and "back lower layer" be M.
Ｍ−ＡおよびＭ−Ｂが前記範囲以外であると、ＣＤ方向の曲げこわさは若干高くなるが、破裂強度が大きく低下する。よって、Ｍ−ＡおよびＭ−Ｂは０．３以上が好ましく、０．４以上がさらに好ましい。また、寸法安定性の観点からＭ−ＡおよびＭ−Ｂは０．８以下が好ましく、０．７以下がより好ましい。 When M-A and M-B are out of the above range, the bending stiffness in the CD direction is slightly increased, but the burst strength is greatly reduced. Therefore, 0.3 or more are preferable and, as for MA and MB, 0.4 or more are more preferable. Moreover, from a viewpoint of dimensional stability, 0.8 or less is preferable and, as for MA and MB, 0.7 or less is more preferable.
表層及び裏層の繊維配向比Ａ及びＢはそれぞれ１．３以下である。Ａ及びＢがこの範囲以外であると、破裂強度は高くなるが、ＣＤ方向の曲げこわさが大きく低下する。Ａ及びＢは１．２以下が好ましく、１．１以下がさらに好ましい。 The fiber orientation ratios A and B of the surface layer and the back layer are respectively 1.3 or less. When A and B are out of this range, the burst strength is high but the bending stiffness in the CD direction is greatly reduced. A and B are preferably 1.2 or less, more preferably 1.1 or less.
引張強度や曲げこわさは、繊維の長軸方向に負荷がかかる場合において最も強くなるため、繊維配向比が高いとＭＤ方向の引張強度とＭＤ方向の曲げこわさは大きくなる一方、ＣＤ方向の引張強度とＣＤ方向の曲げこわさは小さくなる。また、繊維配向比が低いとＭＤ方向の引張強度とＭＤ方向の曲げこわさは小さくなる一方、ＣＤ方向の引張強度とＣＤ方向の曲げこわさは大きくなる。このように、繊維配向比と引張強度、曲げこわさは直接的に関連する。また、ＭＤ方向の引張強度と破裂強度には強い相関があり、ＭＤ方向の引張強度が高いほど破裂強度が高くなる。従って、繊維配向比と破裂強度には直接的な関連があり、繊維配向比が高いと破裂強度は大きく、繊維配向比が低いと破裂強度は低くなる。 The tensile strength and bending stiffness become the strongest when a load is applied in the long axis direction of the fiber, so if the fiber orientation ratio is high, the tensile strength in the MD direction and the bending stiffness in the MD direction become large while the tensile strength in the CD direction And the bending stiffness in the CD direction becomes smaller. In addition, when the fiber orientation ratio is low, the tensile strength in the MD direction and the bending stiffness in the MD direction become small, while the tensile strength in the CD direction and the bending stiffness in the CD direction become large. Thus, the fiber orientation ratio and tensile strength, bending stiffness are directly related. Further, there is a strong correlation between the tensile strength in the MD direction and the burst strength, and the higher the tensile strength in the MD direction, the higher the burst strength. Therefore, there is a direct relationship between the fiber orientation ratio and the burst strength, the higher the fiber orientation ratio, the higher the burst strength, and the lower the fiber orientation ratio, the lower the burst strength.
（３）パルプ原料
本発明の多層紙は、必要に応じて機械パルプ（ＭＰ）、広葉樹クラフトパルプ（ＬＫＰ）、針葉樹クラフトパルプ（ＮＫＰ）等、抄紙原料として一般的に使用されているものの１種類又は２種類以上と再生パルプとを混合して使用することができる。機械パルプとしては、砕木パルプ（ＧＰ）、リファイナー砕木パルプ（ＲＧＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ）、ケミグランドパルプ（ＣＧＰ）、セミケミカルパルプ（ＳＣＰ）等が挙げられる。環境の観点からは、再生パルプの使用量が多いことが望ましい。再生パルプと他のパルプを混合して使用する場合、各層における両者の比率は任意に設定することができ、特に限定されない。
(3) Pulp raw material The multilayer paper of the present invention is one of those generally used as paper making materials, such as mechanical pulp (MP), hardwood kraft pulp (LKP), softwood kraft pulp (NKP), if necessary. Alternatively, two or more types can be used as a mixture with recycled pulp. The mechanical pulp may, for example, be ground pulp (GP), refiner ground pulp (RGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), chemigland pulp (CGP), semichemical pulp (SCP), etc. . From the environmental point of view, it is desirable to use a large amount of recycled pulp. When the regenerated pulp and another pulp are mixed and used, the ratio of both in each layer can be set arbitrarily, and is not particularly limited.
再生パルプの原料となる古紙としては、上質紙、中質紙、下級紙、新聞紙、チラシ、雑誌等の選別古紙やこれらが混合している無選別古紙や、コピー紙、感熱紙、ノーカーボン紙等を含むオフィス古紙等の洋紙系古紙や、段ボール、石膏ボード剥離紙、紙管、包装用紙、塗工板紙、ボール紙等の板紙系古紙等を使用することができる。 Used waste paper to be used as recycled pulp raw materials include high quality paper, medium quality paper, low grade paper, newspaper, flyers, sorted waste paper such as magazines, unsorted waste paper containing these, copy paper, thermal paper, carbonless paper Waste paper such as office waste paper including cardboard, cardboard, gypsum board release paper, paper tube, packaging paper, coated paperboard, paperboard waste paper such as cardboard, etc. can be used.
（４）坪量
本発明の多層紙の坪量は１００〜３００ｇ／ｍ２であることが望ましい。抄き合わせにおける各層の坪量範囲は、所定の範囲内で調整できるが、本紙層全体の坪量に対する表層及び裏層の坪量割合は、それぞれ５〜２０質量％が好ましく、１０〜１５質量％がより好ましい。表層及び裏層の坪量割合が低すぎると、ＣＤ方向の曲げこわさが低くなり、高すぎると破裂強度が低くなる傾向がある。
(4) Basis Weight The basis weight of the multilayer paper of the present invention is preferably 100 to 300 g / m 2 . The basis weight range of each layer in papermaking can be adjusted within a predetermined range, but the basis weight ratio of the surface layer and the back layer to the basis weight of the entire paper layer is preferably 5 to 20% by mass, and 10 to 15%. % Is more preferable. When the basis weight ratio of the surface layer and the back layer is too low, the bending stiffness in the CD direction tends to be low, and when it is too high, the burst strength tends to be low.
（５）填料
本発明の多層紙は填料を含んでいてもよい。填料の種類は特に制限されないが、例えば、重質炭酸カルシウムや軽質炭酸カルシウム等の炭酸カルシウム、炭酸カルシウム−シリカ複合物、酸化チタン、クレー、シリカ、タルク、カオリン、焼成カオリン、デラミカオリン、炭酸マグネシウム、炭酸バリウム、酸化亜鉛、酸化珪素、非晶質シリカ、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛、酸化チタン、ベントナイト等の無機填料；尿素−ホルマリン樹脂、ポリスチレン樹脂、メラミン樹脂、フェノール樹脂、微小中空粒子等の有機填料；を単独又は適宜２種類以上を組み合わせて使用できる。また、製紙スラッジや脱墨フロス等を原料とした再生填料も使用することができる。酸性抄紙の場合は、前記填料から酸溶解性のものを除いた填料が使用され、その単独又は適宜２種類以上を組み合わせて使用できる。
(5) Filler The multilayer paper of the present invention may contain a filler. The type of filler is not particularly limited. For example, calcium carbonate such as calcium carbonate and light calcium carbonate, calcium carbonate-silica composite, titanium oxide, clay, silica, talc, kaolin, calcined kaolin, delami kaolin, magnesium carbonate Inorganic fillers such as barium carbonate, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, titanium oxide and bentonite; urea-formalin resin, polystyrene resin, melamine resin Organic fillers such as phenolic resin and micro hollow particles can be used alone or in combination of two or more kinds. In addition, a recycled filler made from papermaking sludge, deinked floss or the like can also be used. In the case of acidic papermaking, fillers obtained by removing acid-soluble ones from the above-mentioned fillers are used, and they can be used alone or in combination of two or more kinds as appropriate.
本発明では特に、リサイクル可能でかつ紙の不透明度や白色度を比較的低コストで向上させることができるため、炭酸カルシウムを使用して紙面ｐＨが６．０〜９．５となるように中性抄紙することが好ましい。填料の含有量は、少なすぎるとコストアップとなり、多すぎると印刷時や断裁時に紙粉が発生しやすいこと等から、対パルプ絶乾質量あたり１〜２０質量％が好ましい。ここでいう填料の含有量とは、再生パルプに由来する填料や抄紙の際に添加された填料等の総量である。 In the present invention, calcium carbonate is used to achieve a paper surface pH of 6.0 to 9.5, in particular, because the paper is recyclable and the opacity and whiteness of the paper can be improved at relatively low cost. It is preferable to make a papermaking. If the content of the filler is too small, the cost increases, and if it is too large, paper powder is easily generated at the time of printing or cutting, and the like, and is preferably 1 to 20% by mass with respect to the pulp dry weight. The content of the filler as referred to herein is the total amount of the filler derived from the regenerated pulp, the filler added at the time of paper making, and the like.
（６）製紙用薬品
本発明の多層紙には、必要に応じて各種の製紙用薬品を添加できる。具体的には、ポリアクリルアミド系高分子、ポリビニルアルコール系高分子、カチオン性澱粉、両性澱粉、各種変性澱粉、尿素・ホルマリン樹脂、メラミン・ホルマリン樹脂等の内添紙力増強剤；ロジン系サイズ剤、ＡＫＤ系サイズ剤、ＡＳＡ系サイズ剤、石油系サイズ剤、中性ロジンサイズ剤等の内添サイズ剤；等を挙げることができる。また、歩留剤、濾水性向上剤、凝結剤、硫酸バンド、ベントナイト、シリカ、染料、消泡剤、紫外線防止剤、退色防止剤、ピッチコントロール剤、スライムコントロール剤等を用いることができる。
(6) Paper-making chemicals Various paper-making chemicals can be added to the multilayer paper of the present invention as required. Specifically, internally added strength agents such as polyacrylamide type polymers, polyvinyl alcohol type polymers, cationic starch, amphoteric starch, various modified starches, urea / formalin resin, melamine / formalin resin, etc .; rosin type sizing agent And internal sizing agents such as AKD-based sizing agents, ASA-based sizing agents, petroleum-based sizing agents, neutral rosin sizing agents, and the like. Further, a retention agent, a drainage improving agent, a coagulant, a sulfuric acid band, bentonite, silica, a dye, an antifoaming agent, an ultraviolet light inhibitor, an antifading agent, a pitch control agent, a slime control agent and the like can be used.
（７）表面処理
本発明の多層紙には、必要に応じて、片面又は両面に表面処理剤を塗布することができる。表面処理剤の種類や組成は特に限定されないが、表面強度の向上を目的とした水溶性高分子物質として、生澱粉、酸化澱粉、エステル化澱粉、カチオン化澱粉、酵素変性澱粉、アルデヒド化澱粉、ヒドロキシエチル化澱粉、ヒドロキシプロピル化澱粉等の澱粉；カルボキシメチルセルロース、ヒドロキシエチルセルロース、メチルセルロース等のセルロース誘導体；ポリビニルアルコール、カルボキシル変性ポリビニルアルコール等の変性アルコール；スチレンブタジエン共重合体、ポリ酢酸ビニル、塩化ビニル−酢酸ビニル共重合体、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリアクリル酸エステル、ポリアクリルアミド等を単独又は併用して用いることができる。
(7) Surface Treatment In the multilayer paper of the present invention, a surface treatment agent can be applied to one side or both sides as needed. Although the type and composition of the surface treatment agent are not particularly limited, raw starch, oxidized starch, esterified starch, cationized starch, enzyme-modified starch, aldehyde-modified starch, as a water-soluble polymer substance for the purpose of improving surface strength Starches such as hydroxyethylated starch, hydroxypropylated starch; cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, methylcellulose; modified alcohols such as polyvinyl alcohol and carboxyl modified polyvinyl alcohol; styrene butadiene copolymer, polyvinyl acetate, vinyl chloride- A vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid ester, polyacrylamide and the like can be used alone or in combination.
本発明の多層紙を印刷用紙に使用する際には、筆記適性向上あるいはプリンターでの印字適性向上のため、吸水抵抗性があることが好ましい。吸水抵抗性を高めるために、前記の水溶性高分子物質の他に、スチレンアクリル酸、スチレンマレイン酸、オレフィン系化合物等の表面サイズ剤を併用塗布してもよい。 When the multilayer paper of the present invention is used as a printing paper, it is preferable to have water absorption resistance in order to improve the writing aptitude or the printing aptitude in a printer. In order to enhance the water absorption resistance, surface sizing agents such as styrene acrylic acid, styrene maleic acid, olefin compounds and the like may be applied in combination in addition to the above water-soluble polymer substance.
表面処理剤の塗布量は特に制限されず、通常、両面当たり０．５〜５ｇ／ｍ２程度である。また、水溶性高分子物質と表面サイズ剤からなる表面処理剤を塗布する場合、水溶性高分子物質と表面サイズ剤との混合比率は公知の範囲で行えばよい。表面処理剤を塗布する場合、塗工装置は一般に使用されるものを用いることができ、例えば、２ロールサイズプレス、ゲートロールコーター、ロッドメタリングサイズプレス、ブレードコーター、バーブレードコーター、エアナイフコーター、カーテンコーター、スプレーコーター等をオンマシン又はオフマシンで用いることができる。 The application amount of the surface treatment agent is not particularly limited, and is usually about 0.5 to 5 g / m 2 per both surfaces. When a surface treatment agent comprising a water soluble polymer and a surface sizing agent is applied, the mixing ratio of the water soluble polymer to the surface sizing agent may be in a known range. In the case of applying a surface treatment agent, a commonly used coating apparatus can be used, and examples thereof include a 2 roll size press, a gate roll coater, a rod metering size press, a blade coater, a bar blade coater, an air knife coater, A curtain coater, a spray coater, etc. can be used on-machine or off-machine.
さらに、本発明においては紙表面にカレンダー処理を施すこともできる。カレンダー装置の種類と処理条件は特に限定はなく、金属ロールからなる通常のカレンダーやソフトニップカレンダー、高温ソフトニップカレンダー等の公用の装置を適宜選定し、品質目標値に応じて、これらの装置の制御可能な範囲内で条件を設定すればよい。 Furthermore, in the present invention, the paper surface can be calendered. The type of calendering device and the processing conditions are not particularly limited, and publicly available devices such as ordinary calenders made of metal rolls, soft nip calenders, high temperature soft nip calenders, etc. are appropriately selected, and these devices are selected according to the quality target value. The conditions may be set within the controllable range.
（８）多層紙の用途
本発明の多層紙は、印刷用紙、情報用紙、新聞用紙、はがき用紙、包装用紙、ライナーや白板紙等の板紙等に使用することができる。坪量等の諸物性や製造方法等は、各用途に応じて適宜設定してよい。
(8) Applications of Multilayer Paper The multilayer paper of the present invention can be used for printing paper, information paper, newsprint paper, postcard paper, packaging paper, paper board such as liner, white paper board, etc. Various physical properties such as basis weight and the manufacturing method may be appropriately set according to each application.
２．製造方法
本発明の多層紙は、各層の紙料をそれぞれ調製し、長網型湿式抄紙機、ツインワイヤー抄紙機、ヤンキー抄紙機、円網抄紙機、円網短網コンビネーション抄紙機等、公知の多層抄紙が可能な抄紙機を適宜選択して製造することができる。本発明では長網型湿式抄紙機が好ましい。
2. Manufacturing method The multilayer paper of the present invention prepares the stock of each layer, and is known as a long mesh type wet paper machine, twin wire paper machine, Yankee paper machine, circular mesh paper machine, circular mesh short mesh combination paper machine, etc. A papermaking machine capable of multi-layered papermaking can be appropriately selected and manufactured. In the present invention, a long mesh-type wet paper machine is preferred.
本発明の多層紙の製造方法の一例として、ワイヤーパート上に紙料を吐出することを含む方法であって、かつ以下の工程（１）〜（３）を含む方法を挙げることができる。
（１）各層毎に吐出速度（「ジェットの速度」ともいう）Ｊとワイヤー速度Ｗとの比Ｊ／Ｗを複数変更して抄造テストを行い、各層毎にＪ／Ｗ比と繊維配向比すなわちＡ、Ｂ、及びＭとの関係を詳細に把握する。この際、Ｊ／Ｗ比（％）に関して、１００％を中心として１０５〜９５％の間を１％程度の間隔にて順次変更して実施することが望ましい。ワイヤー速度Ｗより吐出速度Ｊが遅い状態を「引きの状態」（Ｊ／Ｗ比＜１００％）、吐出速度Ｊが速い状態を「押しの状態」（Ｊ／Ｗ比＞１００％）という。
As an example of the method for producing a multilayer paper of the present invention, a method including discharging a stock on a wire part and including the following steps (1) to (3) can be mentioned.
(1) A paper making test is conducted by changing a plurality of ratio J / W of discharge speed (also referred to as “jet speed”) J and wire speed W for each layer, and the J / W ratio and fiber orientation ratio for each layer Understand the relationship with A, B and M in detail. At this time, it is desirable that the J / W ratio (%) be changed by sequentially changing between 105 and 95% around 100% at an interval of about 1%. A state where the discharge speed J is slower than the wire speed W is referred to as a "pulled state" (J / W ratio <100%), and a state where the discharge speed J is faster is referred to as a "pushed state" (J / W ratio> 100%).
単一ヘッドボックスを用いる多層抄紙機では、各層毎の個別の抄造が困難であるため、各層毎のＪ／Ｗ比を順次変更して各層抄き合せた状態でサンプル採取を行い、次いでサンプルに水を付ける等して各層を完全に剥離して繊維配向比を評価し、Ｊ／Ｗ比との関係を把握する。きれいに剥離できない場合、粘着テープ等を用いて層を剥離してＪ／Ｗ比を変更した層を単離し、繊維配向比を評価する。 In a multi-layer paper machine using a single head box, it is difficult to make individual layers for each layer, so the J / W ratio for each layer is sequentially changed to sample each layer in a mixed state, and then to the sample Each layer is completely peeled off by adding water or the like, the fiber orientation ratio is evaluated, and the relationship with the J / W ratio is grasped. If the layer can not be peeled off cleanly, the layer is peeled using a pressure-sensitive adhesive tape or the like to isolate the layer having the changed J / W ratio, and the fiber orientation ratio is evaluated.
（２）上記により見出した、各層のＪ／Ｗ比と繊維配向比（Ａ、Ｂ、及びＭ）の関係から、Ｍ−Ａ及びＭ−Ｂがそれぞれ０．２以上であり、かつＡ及びＢがそれぞれ１．３以下でとなるように各層のＪ／Ｗ比条件を決定し、これを採用して各層を製造する。
（３）製造された各層を抄き合わせして多層紙を製造する。
（４）さらに必要により、各層の繊維配向比の測定結果をＪ／Ｗ比にフィードバックして調整した後に、各層を抄き合わせる。
(2) From the relationship between the J / W ratio of each layer and the fiber orientation ratio (A, B, and M) found above, M-A and M-B are each 0.2 or more, and A and B The J / W ratio conditions of each layer are determined so that each becomes 1.3 or less, and this is adopted to manufacture each layer.
(3) The manufactured layers are milled together to produce a multilayer paper.
(4) Further, if necessary, the measurement results of the fiber orientation ratio of each layer are fed back to the J / W ratio to adjust, and then the layers are combined.
以下、実施例に基づいて本発明を詳細に説明するが本発明は実施例に限定されない。以下の実施例では３層の抄き合わせで多層紙を用いた。各層を順に「表層」「中層」「裏層」とした。評価及び測定方法は以下のとおりである。
［繊維配向比］
マイクロ波を使用したマイクロ波分子配向度測定装置（王子計測器（株）製）により測定した。
［破裂強度］
ＪＩＳ ８１３１：２００９による板紙−破裂強さ試験方法により測定した。
［ＣＤ方向の曲げこわさ］
ＩＳＯ ２４９３により測定した。
Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limited to the examples. In the following examples, multi-layer paper was used in three-layer papermaking. Each layer was made into "surface layer""middlelayer""backlayer" in order. The evaluation and measurement methods are as follows.
[Fiber orientation ratio]
It measured by the microwave molecular orientation degree measuring apparatus (made by Oji Scientific Instruments Co., Ltd. product) which used the microwave.
Burst strength
It measured by the paper board-burst strength test method by JIS 8131: 2009.
[Bending stiffness in the CD direction]
Measured according to ISO 2493.
［実施例１］
（１）各層の原料
表層のパルプとして針葉樹見晒クラフトパルプ（ＮＵＫＰ）１０質量％、未使用段ボールの古紙パルプ（ＦＲＰＤ）９０質量％、中層と裏層のパルプとして段ボール古紙パルプ（ＲＰＤ）１００質量％を使用した。表層には、硫酸バンド２．５質量％、ロジン系サイズ剤０．４５質量％を添加した。また、中層には、紙力増強剤として両性澱粉０．８質量％、硫酸バンド２．０質量％、ロジン系サイズ剤０．１２質量％を添加した。裏層には、紙力増強剤として両性澱粉０．２５質量％、硫酸バンド２．０質量％、ロジン系サイズ剤０．２２質量％添加した。
Example 1
(1) Raw material of each layer 10% by mass of softwood Mio bleached kraft pulp (NUKP) as surface layer pulp, 90% by mass of unused cardboard waste paper pulp (FRPD), 100 mass of corrugated waste paper pulp (RPD) as middle layer and back layer pulp %It was used. To the surface layer, 2.5% by mass of a sulfuric acid band and 0.45% by mass of a rosin-based sizing agent were added. In the middle layer, 0.8% by mass of amphoteric starch, 2.0% by mass of sulfuric acid band, and 0.12% by mass of rosin-based sizing agent were added as paper strength agents. To the backing layer, 0.25% by mass of amphoteric starch, 2.0% by mass of sulfuric acid band, and 0.22% by mass of rosin-based sizing agent were added as paper strength agents.
（２）各層のＪ／Ｗ比
事前に各層に関してＪ／Ｗ比を複数変更して抄造テストを行いＪ／Ｗ比と繊維配向比の関係を把握した。この関係から表層、中層、裏層の繊維配向比がそれぞれ１．２、１．５、１．２となるようにＪ／Ｗ比を設定した。
（３）抄き合わせ
抄紙速度を７５０ｍ／分、各層の米坪をそれぞれ、２５ｇ／ｍ２、１１５ｇ／ｍ２、３０ｇ／ｍ２とした計３層で抄き合わせ、１７０ｇ／ｍ２のライナー原紙を得た。
(2) J / W ratio of each layer A plurality of J / W ratios were changed in advance for each layer and a paper making test was conducted to grasp the relationship between the J / W ratio and the fiber orientation ratio. From this relationship, the J / W ratio was set so that the fiber orientation ratio of the surface layer, middle layer and back layer would be 1.2, 1.5 and 1.2, respectively.
(3) paper making combined machine speed 750 meters / minute, combined paper making the basis weight of each layer, respectively, 25g / m 2, 115g / m 2, a total of three layers was 30g / m 2, 170g / m 2 of liner I got the base paper.
［実施例２］
表層、中層、裏層の繊維配向比がそれぞれ１．３、１．５、１．２となるＪ／Ｗ比に設定し抄造した以外は、実施例１と同様にしてライナー原紙を得た。
Example 2
A liner base paper was obtained in the same manner as Example 1, except that the fiber orientation ratio of the surface layer, middle layer, and back layer was set to a J / W ratio of 1.3, 1.5, and 1.2, respectively, to obtain a paper.
［比較例１］
表層、中層、裏層の繊維配向比がそれぞれ１．５、１．３、１．７となるＪ／Ｗ比に設定し抄造した以外は、実施例１と同様にしてライナー原紙を得た。
［比較例２］
表層、中層、裏層の繊維配向比がそれぞれ１．２、１．２、１．３となるＪ／Ｗ比に設定し抄造した以外は、実施例１と同様にしてライナー原紙を得た。
Comparative Example 1
A liner base paper was obtained in the same manner as Example 1, except that the fiber orientation ratio of the surface layer, middle layer, and back layer was set to a J / W ratio of 1.5, 1.3, and 1.7, respectively, to obtain a paper.
Comparative Example 2
A liner base paper was obtained in the same manner as Example 1, except that the fiber orientation ratio of the surface layer, middle layer, and back layer was set to a J / W ratio of 1.2, 1.2, and 1.3, respectively, to obtain a paper.
［比較例３］
表層、中層、裏層の繊維配向比がそれぞれ１．２、１．１、１．３となるＪ／Ｗ比に設定し抄造した以外は、実施例１と同様にしてライナー原紙を得た。
［比較例４］
表層、中層、裏層の繊維配向比がそれぞれ１．７、１．５、１．７となるＪ／Ｗ比に設定し抄造した以外は、実施例１と同様にしてライナー原紙を得た。
［比較例５］
表層、中層、裏層の繊維配向比がそれぞれ１．５、１．７、１．４となるＪ／Ｗ比に設定し抄造した以外は、実施例１と同様にしてライナー原紙を得た。
結果を表１に示す。
Comparative Example 3
A liner base paper was obtained in the same manner as Example 1, except that the fiber orientation ratio of the surface layer, middle layer, and back layer was set to a J / W ratio of 1.2, 1.1, and 1.3, respectively.
Comparative Example 4
A liner base paper was obtained in the same manner as Example 1, except that the fiber orientation ratio of the surface layer, middle layer, and back layer was set to a J / W ratio of 1.7, 1.5, and 1.7, respectively, to obtain a paper.
Comparative Example 5
A liner base paper was obtained in the same manner as Example 1, except that the fiber orientation ratio of the surface layer, middle layer, and back layer was set to a J / W ratio of 1.5, 1.7, and 1.4, respectively, to obtain a sheet.
The results are shown in Table 1.
表１より、３層以上の抄き合わせを行う多層紙において、表層及び裏層を除く層の繊維配向比から表層及び裏層の繊維配向比を引いた値がそれぞれ０．２以上であり、かつ表層及び裏層の繊維配向比が１．３以下である実施例１及び実施例２のライナー原紙は、比破裂強度とＣＤ方向の曲げこわさが優れていることが分かる。これに対し、表層又は裏層の繊維配向比が１．３以上である比較例１、４、５のライナー原紙は、実施例１、２のライナー原紙よりも比破裂強度が高いものの、ＣＤ方向の曲げこわさが低いことが分かる。 From Table 1, in multilayer paper in which three or more layers are laminated, the value obtained by subtracting the fiber orientation ratio of the surface layer and the back layer from the fiber orientation ratio of the layer excluding the surface layer and the back layer is 0.2 or more, And, it can be seen that the liner base papers of Examples 1 and 2 in which the fiber orientation ratio of the surface layer and the back layer is 1.3 or less are excellent in specific burst strength and bending stiffness in the CD direction. On the other hand, the liner base papers of Comparative Examples 1, 4 and 5 in which the fiber orientation ratio of the surface layer or the back layer is 1.3 or more are higher in specific burst strength than the liner base papers of Examples 1 and 2 but the CD direction It can be seen that the bending stiffness of the
表層及び／又は裏層の繊維配向比が１．３以下であるが、中層の繊維配向比から表層及び裏層の繊維配向比を引いた値が０．２未満である比較例２、３のライナー原紙は、実施例１、２のライナー原紙よりもＣＤ方向の曲げこわさが高いものの、比破裂強度が低いことが分かる。また、中層の繊維配向比から表層及び裏層の繊維配向比を引いた値が０．２以上であるが、表層及び裏層の繊維配向比が１．３より高い比較例５のライナー原紙は、実施例１、２のライナー原紙よりも比破裂強度が高いものの、ＣＤ方向の曲げこわさが低いことが分かる。 The fiber orientation ratio of the surface layer and / or the back layer is 1.3 or less, but the value obtained by subtracting the fiber orientation ratio of the surface layer and the back layer from the fiber orientation ratio of the middle layer is less than 0.2 Although the liner base paper has higher bending stiffness in the CD direction than the liner base papers of Examples 1 and 2, it can be seen that the relative burst strength is low. Moreover, the value obtained by subtracting the fiber orientation ratio of the surface layer and the back layer from the fiber orientation ratio of the middle layer is 0.2 or more, but the liner base paper of Comparative Example 5 of which the fiber orientation ratio of the surface layer and the back layer is higher than 1.3 Although the specific burst strength is higher than the liner base papers of Examples 1 and 2, it is understood that the bending stiffness in the CD direction is low.
以上、本発明の多層紙は優れた破裂強度とＣＤ方向の曲げこわさを併せ持つ。 As described above, the multilayer paper of the present invention has excellent burst strength and bending stiffness in the CD direction.
Claims (3)
Ｍ−Ａ及びＭ−Ｂがそれぞれ０．２以上であり、かつ
Ａ及びＢがそれぞれ１．３以下である、多層紙。 A multilayer paper obtained by three or more layers of papermaking, wherein the fiber orientation ratio determined by the measurement of the degree of microwave molecular orientation of the layer excluding the surface layer and the back layer is M, the degree of microwave molecular orientation of the surface layer and the back layer Assuming that the fiber orientation ratio determined by measurement is A and B, respectively
Multilayer paper in which M-A and M-B are each 0.2 or more, and A and B are each 1.3 or less.
ワイヤーパート上に紙料を吐出することを含み、かつ
前記Ｍ−Ａ及びＭ−Ｂがそれぞれ０．２以上、Ａ及びＢがそれぞれ１．３以下となるように各層における吐出速度Ｊとワイヤー速度Ｗとの比Ｊ／Ｗを調整することを含む、
製造方法。 A method for producing a multilayer paper according to claim 1, wherein
Ejection speed J and wire speed in each layer so as to make the MA and M-B be 0.2 or more and A and B be 1.3 or less, respectively. Including adjusting the ratio J / W with W,
Production method.
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