JP5949168B2 - Coated fancy paper - Google Patents
Coated fancy paper Download PDFInfo
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- JP5949168B2 JP5949168B2 JP2012123849A JP2012123849A JP5949168B2 JP 5949168 B2 JP5949168 B2 JP 5949168B2 JP 2012123849 A JP2012123849 A JP 2012123849A JP 2012123849 A JP2012123849 A JP 2012123849A JP 5949168 B2 JP5949168 B2 JP 5949168B2
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Landscapes
- Paper (AREA)
Description
本発明は、非塗工紙の風合いを有しているマット調の塗工ファンシー紙に関し、特に、印刷品質の良好な塗工ファンシー紙に関する。 The present invention relates to a matte-coated coated fancy paper having a texture of non-coated paper, and more particularly to a coated fancy paper having good print quality.
近年、印刷物に求められる品質への要求は高まっており、印刷用紙としても印刷時の品質・表現性が良好なことはもとより、印刷後の後加工適性等も良好であることが求められている。 In recent years, there has been an increasing demand for quality required for printed materials, and it is required that printing paper has good quality and expressability during printing as well as good post-processing suitability after printing. .
印刷用紙は、セルロース繊維を主体とした原紙に対し、顔料塗工を行わない非塗工印刷用紙(以下、非塗工紙と記載する)と、顔料及び接着剤を主体とする顔料塗工層を設けた塗工印刷用紙(以下、塗工紙と記載する)に分類することができる。 Printing paper consists of non-coated printing paper (hereinafter referred to as non-coated paper) that is not coated with pigment on the base paper mainly composed of cellulose fibers, and a pigment-coated layer mainly composed of pigment and adhesive. Can be classified into coated printing paper (hereinafter referred to as coated paper).
非塗工紙は、その表面に原紙の主成分たるセルロース繊維を認識することができ、表面の光沢性が低くマット調であり、かつ、表面の凹凸に富むことから視覚的なイメージならびに触感において独特の風合いを有していることが特徴の一つである。 Non-coated paper can recognize the cellulose fiber that is the main component of the base paper on its surface, has a low gloss and a matte surface, and is rich in surface irregularities. One of the features is that it has a unique texture.
しかしながら、非塗工紙は、表面の凹凸の影響ならびに表面のインキ受理性が低位であることに起因して、印刷した際の表現性が劣る、インキの乾燥性が劣る、等の問題がある。 However, non-coated paper has problems such as poor printability and poor ink drying due to the effects of surface irregularities and low surface ink acceptability. .
一方、塗工紙は、原紙表面に塗工された顔料及び接着剤を主成分とする顔料塗工層の存在により、非塗工紙と比較して表面平滑性が高いという特徴がある。特に、顔料塗工層を設けた後に平滑化処理を行った、紙表面の光沢である白紙光沢が高いグロス調塗工紙は、表面平滑性が非常に高いため、印刷時の表現性が良好である。また、顔料塗工層中で顔料粒子間に形成される細孔は、セルロース繊維間に形成される原紙細孔よりも孔径が小さいため、インキ中のビヒクル成分の分離効果が高く、その結果、塗工紙は非塗工紙よりもインキの乾燥性にも優れるという特徴がある。 On the other hand, coated paper is characterized by high surface smoothness compared to non-coated paper due to the presence of a pigment coating layer mainly composed of a pigment and an adhesive coated on the surface of the base paper. In particular, glossy coated paper with high white paper gloss, which is the gloss of the paper surface after the pigment coating layer has been applied, has very high surface smoothness, so it has good expressibility during printing. It is. In addition, since the pores formed between the pigment particles in the pigment coating layer have a smaller pore diameter than the base paper pores formed between the cellulose fibers, the separation effect of the vehicle component in the ink is high. Coated paper is characterized by having better ink drying properties than non-coated paper.
しかしながら、塗工紙は原紙表面の凹凸を被覆して顔料塗工層を設けるため、非塗工紙とは異なる外観を呈し、また平滑性が異なるため触感においても非塗工紙とは異なっている。 However, the coated paper covers the unevenness of the base paper surface and provides a pigment coating layer, so it has a different appearance from the non-coated paper, and the smoothness is different, so the touch is also different from the non-coated paper. Yes.
高級印刷分野では、印刷物の差別化、高級化を図るため、印刷用紙に対しても特別な要求がされることがある。その中で、いわゆるファンシー紙と呼ばれる、紙に色・模様・柄などを付したり、原紙中に毛染繊維を混抄したりした、装飾性の高い印刷用紙があり、顔料塗工層を有する塗工ファンシー紙も存在する。 In the high-grade printing field, there are cases where special demands are also made on printing paper in order to differentiate and enhance the quality of printed matter. Among them, there is a so-called fancy paper, which is a highly decorative printing paper with a color, pattern, pattern, etc., or a mixture of hair dye fibers in the base paper, and has a pigment coating layer There is also a coated fancy paper.
塗工ファンシー紙は、印刷を施した際の印刷部の光沢である印刷光沢が比較的高いグロス系と、印刷光沢が低いマット系に分類されることがあるが、いずれも、非塗工紙の持つ表面凹凸感や触感、低光沢な外観を模して非塗工紙風合いを有するように仕上げられている。塗工ファンシー紙は、原紙上に顔料塗工層を有するため、非塗工紙と比較して印刷品質が良好であることが特徴である。すなわち、非塗工紙の風合いを持ちつつ、塗工紙の印刷品質をも両立させた紙である。
前記の如く、塗工ファンシー紙は、非塗工紙と塗工紙の良い面を併せ持ってはいるが、これまでの塗工ファンシー紙に印刷を行った場合には幾つかの欠点があった。
Coated fancy paper is sometimes classified into glossy, which has a relatively high printing gloss, which is the gloss of the printed part when it is printed, and matte, which has a low printing gloss, both of which are uncoated paper It is finished to have a texture of non-coated paper, imitating the surface unevenness and feel of the material, and the low gloss appearance. The coated fancy paper is characterized in that the printing quality is better than the non-coated paper because it has a pigment coating layer on the base paper. In other words, it is a paper that has the texture of non-coated paper and at the same time has the print quality of the coated paper.
As described above, coated fancy paper has both the good aspects of non-coated paper and coated paper, but there have been some drawbacks when printing on conventional coated fancy paper. .
塗工ファンシー紙は、非塗工紙風合いを保持するため、低光沢となるように仕上げられる。このため、一般印刷塗工紙に施される、顔料塗工層の塗工・乾燥後のカレンダー処理工程での平滑化行程を経ないか、軽度の平滑化が施されるに留まる。従って、紙同士の接触や、印刷・製本過程での機械部との接触により顔料塗工層が擦られた場合に、擦られた部分における凸部の顔料の配向性変化が誘発されることで平滑化が促進され、局所的に白紙光沢が上昇して擦られていない部分との光沢差が顕在化し、いわゆるコスレ傷を生ずるという問題があった。 The coated fancy paper is finished to have a low gloss in order to maintain the uncoated paper texture. For this reason, it does not pass through the smoothing process in the calendering process after the coating / drying of the pigment coating layer, which is applied to the general printing coated paper, or only a slight smoothing is performed. Therefore, when the pigment coating layer is rubbed due to contact between papers or contact with the machine part in the printing / binding process, a change in the orientation of the pigment on the convex part in the rubbed part is induced. There is a problem that smoothing is promoted, the gloss of the white paper is locally increased, and a difference in gloss from the non-rubbed portion becomes obvious, so that a so-called scratch is generated.
また、塗工ファンシー紙製品の顔料塗工層表面は、平滑化工程を経ないか軽度の平滑化工程を経るのみであるため、用いられている顔料の大きさレベルでの微小な凹凸が残存している。さらに、原紙として凹凸の大きな原紙を使用した場合には、原紙の凹凸に対応するレベルでも顔料塗工層表面に凹凸が存在する。これらの微小な凹凸や原紙の凹凸による顔料塗工面の凹凸部は、印刷を施す際に印圧により平滑化される塗工面へのインキ転移を阻害せず、かつ良好な再現性を有する範囲に調節されている。 In addition, since the surface of the pigment coating layer of the coated fancy paper product is not subjected to a smoothing process or only a light smoothing process, minute unevenness at the size level of the pigment used remains. doing. Further, when a base paper having a large unevenness is used as the base paper, the surface of the pigment coating layer has unevenness even at a level corresponding to the unevenness of the base paper. The uneven portion of the pigment coated surface due to these minute unevenness and the unevenness of the base paper does not inhibit the ink transfer to the coated surface smoothed by the printing pressure when printing, and has a good reproducibility range. It has been adjusted.
しかし、前記の顔料塗工層表面の凹凸が原因となって、用紙に対する印刷完了後に、非印刷部が印刷部表面に接触した場合、非印刷部にインキが転移して用紙の汚れを発生させる、いわゆるコスレ汚れが問題となることがあった。 However, when the non-printing part comes into contact with the surface of the printing part after completion of printing on the paper due to the unevenness of the surface of the pigment coating layer, the ink is transferred to the non-printing part and the paper is smeared. So-called cosmetic stains sometimes became a problem.
非塗工紙風合いを有する顔料塗工紙としては、これまで幾つかの方法が提案されている。例えば、特定の平滑度を有する基材上に有機填料を特定量配合した塗工層を形成し、塗工面の表面粗さを特定の範囲に調整した塗工印刷用紙(特許文献1参照)、バインダーと艶消し剤を含む塗工層を設けてなる印刷用艶消し塗工紙(特許文献2参照)、原紙上に、顔料と接着剤を主とする塗工層を設けた印刷用塗工紙において、最表層を特定の塗工量として設け、次いで該最表層を特定の凹凸を有するように凹凸加工を施す方法(特許文献3参照)、原紙上にカオリンと有機合成顔料等を含有し、さらにバインダーとしてスチレン−ブタジエン共重合体ラテックスと特定澱粉を特定量含有する塗被層を設けた高級印刷用紙(特許文献4)、顔料塗工層に特定の平均粒子径以上のカオリン等の顔料を特定量以上配合して、顔料塗工層表面の光沢度、平滑度、表面粗さ、静摩擦係数等の表面物性を調整した艶消し塗工紙(特許文献5)、基紙上に少なくとも2層の顔料塗工層を設けた印刷用塗工紙であって、特定粒子を含有する下塗り層を設けた後に、顔料が特定粒子のみで構成される上塗り層を設けた印刷用塗工紙(特許文献6)、塗被層に特定のポリエチレンワックス等を特定量含有する顔料塗被紙(特許文献7)等が提案されている。 Several methods have been proposed for pigment-coated paper having a non-coated paper texture. For example, a coated printing paper in which a coating layer containing a specific amount of organic filler is formed on a substrate having a specific smoothness, and the surface roughness of the coated surface is adjusted to a specific range (see Patent Document 1), Matte coated paper for printing, which is provided with a coating layer containing a binder and a matting agent (see Patent Document 2), a printing coating in which a coating layer mainly composed of a pigment and an adhesive is provided on a base paper In the paper, a method in which the outermost layer is provided as a specific coating amount, and then the outermost layer is subjected to uneven processing so as to have specific unevenness (see Patent Document 3), kaolin and an organic synthetic pigment are contained on the base paper. Furthermore, high-grade printing paper (Patent Document 4) provided with a coating layer containing a specific amount of a styrene-butadiene copolymer latex and a specific starch as a binder, and a pigment such as kaolin having a specific average particle size or more in the pigment coating layer More than a specific amount, and light on the pigment coating layer surface Matte coated paper (Patent Document 5) with adjusted surface properties such as degree, smoothness, surface roughness, static friction coefficient, etc., and printing coated paper provided with at least two pigment coating layers on the base paper. In addition, after providing an undercoat layer containing specific particles, a coated paper for printing (Patent Document 6) provided with an overcoat layer whose pigment is composed of only specific particles, a specific polyethylene wax or the like is specified for the coating layer An amount-containing pigment-coated paper (Patent Document 7) has been proposed.
しかし、非塗工紙風合いを有するマット調の塗工ファンシー紙であって、かつ、印刷品質の極めて良好な高級塗工ファンシー紙の需要に十分に応えられる状態とはなっていない。 However, it is not in a state that can sufficiently meet the demand for high-quality coated fancy paper having matte-like coated fancy paper having a non-coated paper texture and extremely good print quality.
本発明は、非塗工紙風合いを有するマット調の塗工ファンシー紙であって、コスレ傷やコスレ汚れが発生しにくく、インキ乾燥性も良好で、印刷品質の極めて良好な高級塗工ファンシー紙を提供することを目的とするものである。 The present invention is a matte-coated coated fancy paper having a non-coated paper texture, which is less likely to cause scratches and stains, has good ink drying properties, and has a very good printing quality. Is intended to provide.
本発明は、以下の塗工ファンシー紙の発明を包含する。
(1)原紙の少なくとも片面に、非接触計量形式による塗工装置により形成されている顔料及び接着剤を主成分とする顔料塗工層を有するマット調塗工ファンシー紙であって、前記顔料塗工層が、全顔料100質量部中に、平均粒子径2.0〜4.0μmのタルクを5質量部以上40質量部未満含有し、かつ、軽質炭酸カルシウム及び/又は重質炭酸カルシウムを30質量部以上含有するとともに、乾燥後塗工量が片面あたり3〜15g/m2の顔料塗工層であり、塗工面のISO 8254−1(1999)に準じて測定される入射・受光角75度の白紙光沢度が3以上20未満であることを特徴とする、塗工ファンシー紙。
The present invention includes the following inventions of coated fancy paper.
(1) Matte-coated fancy paper having a pigment coating layer mainly composed of a pigment and an adhesive formed on a non-contact metering type coating device on at least one side of a base paper, the pigment coating The work layer contains 5 parts by mass or more and less than 40 parts by mass of talc having an average particle size of 2.0 to 4.0 μm in 100 parts by mass of all pigments, and 30 light calcium carbonates and / or heavy calcium carbonates. Incidence / reception angle 75, which is a pigment coating layer containing 3 parts by mass or more and having a coating amount after drying of 3 to 15 g / m 2 per surface and measured according to ISO 8254-1 (1999) of the coated surface. Coated fancy paper, characterized in that the glossiness of the white paper is 3 or more and less than 20.
(2)前記顔料塗工層が、さらに平均粒子径0.4〜1.0μmのデラミネーテッドカオリンを全顔料100質量部中に30質量部以下の量で含有する顔料塗工層である、(1)項に記載の塗工ファンシー紙。 (2) The pigment coating layer further includes a delaminated kaolin having an average particle size of 0.4 to 1.0 μm in an amount of 30 parts by mass or less in 100 parts by mass of the total pigment. The coated fancy paper according to item (1).
(3)前記顔料塗工層中の重質炭酸カルシウムが、平均粒子径が0.5〜1.0μmであり、かつ、粒子径0.2μm以下の粒子の割合が15質量%未満である重質炭酸カルシウムである(1)項又は(2)項に記載の塗工ファンシー紙。
(4)前記顔料塗工層が、立方形状軽質炭酸カルシウムを全顔料100質量部中10〜30部含有する顔料塗工層である、(1)項〜(3)項のいずれか1項に記載の塗工ファンシー紙。
(5)前記非接触計量形式による塗工装置が、エアーナイフコーター、カーテンコーター、スロットダイコーター、スプレーコーターから選ばれる塗工装置である(1)項〜(4)項のいずれか1項に記載の塗工ファンシー紙
(6)前記塗工層が形成される原紙面及び顔料塗工層を設けた後の塗工面のいずれもカレンダー処理が施されていない面である(1)項〜(5)項のいずれか1項に記載の塗工ファンシー紙。
(3) Heavy calcium carbonate in the pigment coating layer has an average particle diameter of 0.5 to 1.0 μm and a ratio of particles having a particle diameter of 0.2 μm or less is less than 15% by mass. Coated fancy paper according to item (1) or (2), which is a quality calcium carbonate.
(4) In any one of the items (1) to (3), the pigment coating layer is a pigment coating layer containing 10 to 30 parts of cubic light calcium carbonate in 100 parts by mass of all pigments. Coated fancy paper as described.
(5) The coating apparatus according to the non-contact metering type is a coating apparatus selected from an air knife coater, a curtain coater, a slot die coater, and a spray coater. Coated fancy paper as described (6) The surface of the base paper on which the coating layer is formed and the coating surface after the pigment coating layer is provided are surfaces that are not subjected to calendar treatment (1) to ( 5. The coated fancy paper according to any one of items 5).
本発明の塗工ファンシー紙は、非塗工紙風合いを有するマット調の塗工紙であって、塗工面にコスレ傷やコスレ汚れが発生しにくく、インキ乾燥性に優れているという印刷品質の良好な高級感のある塗工ファンシー紙である。 The coated fancy paper of the present invention is a mat-like coated paper having a texture of non-coated paper, which is less likely to cause scratches and stains on the coated surface, and has excellent printing quality such as excellent ink drying properties. It is a coated fancy paper with good quality.
以下に、本発明について詳細に説明する。
本発明の塗工ファンシー紙は、高級印刷分野で印刷物の差別化、高級化を図るために使用されている、紙に色・模様・柄などを付したり、原紙中に毛染繊維を混抄したりした、装飾性の高い印刷用紙であって、一般に、ファンシー紙(ファンシーペーパー)やファインペーパーと呼ばれている印刷用紙のうち、非塗工紙の持つ表面凹凸感や触感、低光沢な外観を模して非塗工紙風合いを有するように仕上げられた顔料塗工層を有する塗工ファンシー紙である。
The present invention is described in detail below.
The coated fancy paper of the present invention is used for differentiating and improving the quality of printed matter in the high-grade printing field. Color, pattern, pattern, etc. are added to the paper, and hair dye fibers are mixed in the base paper. This is a highly decorative printing paper that is generally fancy paper (fancy paper) or fine paper. Among the printing papers that are non-coated paper, the surface unevenness and touch and low gloss This is a coated fancy paper having a pigment coating layer that is finished so as to have an uncoated paper texture to simulate the appearance.
本発明の非塗工紙風合いを有するマット調の塗工ファンシー紙に使用される原紙の主体となるセルロース繊維としては、代表的には、木材を原料としたパルプが使用されるが、ケナフ・バガス・バンブー・コットンなど非木材系パルプも使用できる。木材パルプの原材料は、広葉樹材、針葉樹材のいずれでもよい。また、原材料からパルプを得るための方法としては、クラフト蒸解、ポリサルファイド蒸解、ソーダ蒸解、アルカリサルファイト蒸解等の公知の蒸解法を用いることができる。 As the cellulose fiber that is the main material of the base paper used in the matte coated fancy paper having the texture of the non-coated paper of the present invention, typically, pulp made from wood is used. Non-wood pulp such as bagasse, bamboo and cotton can also be used. The raw material for wood pulp may be either hardwood or softwood. As a method for obtaining pulp from raw materials, known cooking methods such as kraft cooking, polysulfide cooking, soda cooking, alkali sulfite cooking, etc. can be used.
蒸解により得られた未漂白パルプは、洗浄、粗選及び精選工程を経て、公知のアルカリ酸素漂白法により脱リグニンされることが好ましい。本発明に使用できるアルカリ酸素漂白法は、公知の中濃度法或いは高濃度法がそのまま適用できるが、現在、汎用的に用いられているパルプ濃度が8〜15%で行われる中濃度法が好ましい。本発明では、アルカリ酸素漂白工程において、上記アルカリ酸素漂白を連続して複数回行い、できる限り脱リグニンを進めるのが好ましい実施態様である。
アルカリ酸素漂白が施されたパルプは次いで洗浄工程へ送られる。パルプは洗浄後、多段漂白工程へ送られる。
The unbleached pulp obtained by cooking is preferably delignified by a known alkaline oxygen bleaching method after washing, rough selection and selection steps. As the alkaline oxygen bleaching method that can be used in the present invention, a known medium concentration method or high concentration method can be applied as it is, but a medium concentration method that is currently used at a pulp concentration of 8 to 15% is preferred. . In the present invention, in the alkaline oxygen bleaching step, it is a preferred embodiment that the alkali oxygen bleaching is continuously performed a plurality of times and delignification proceeds as much as possible.
The pulp that has been subjected to alkaline oxygen bleaching is then sent to a washing step. After washing, the pulp is sent to a multistage bleaching process.
本発明で原紙用のパルプとして使用される漂白パルプを得るための多段漂白工程では、公知の漂白工程を適宜使用できるが、近年の環境問題に対する取り組みの見地から、オゾン漂白段を用いることが好ましい。また、必要であれば、二酸化塩素、他の漂白薬品を併用することも可能である。本発明の多段漂白工程で使用できる漂白段は、好ましく用いられるオゾン漂白段以外として、公知の漂白段を用いることができる。多段漂白後のパルプは、叩解工程、または抄紙工程へ送られる。 In the multi-stage bleaching step for obtaining the bleached pulp used as the pulp for the base paper in the present invention, a known bleaching step can be used as appropriate. From the viewpoint of efforts for environmental problems in recent years, it is preferable to use the ozone bleaching step. . If necessary, chlorine dioxide and other bleaching chemicals can be used in combination. As the bleaching stage that can be used in the multi-stage bleaching step of the present invention, a known bleaching stage can be used in addition to the ozone bleaching stage that is preferably used. The pulp after multistage bleaching is sent to a beating process or a papermaking process.
上記パルプに対して、砕木パルプ、加圧式砕木パルプ、リファイナ砕木パルプ、サーモメカニカルパルプ等の機械パルプ、脱墨古紙パルプ、損紙なども、本発明の所望の効果を妨げない限り、適宜混合使用することができる。さらには、パルプスラリーを抄紙機で抄き上げ、湿潤状態あるいは乾燥状態でシート化したものを、再度離解してパルプスラリーとしたパルプも使用できる。 For the above pulp, mechanical pulp such as ground pulp, pressurized ground pulp, refiner ground wood pulp, thermomechanical pulp, etc., deinked waste paper pulp, waste paper, etc. are used as appropriate as long as they do not interfere with the desired effect of the present invention can do. Furthermore, pulp obtained by making pulp slurry with a paper machine and making it into a sheet in a wet state or a dry state can be disaggregated again to obtain pulp slurry.
原紙を構成するパルプは叩解工程を経た後、スラリー状のパルプ水分散液である紙料として抄紙機に送られる。この紙料に対して、填料や、内添サイズ剤、アニオン性、ノニオン性、カチオン性あるいは両性の歩留向上剤、濾水性向上剤、紙力増強剤等の抄紙用内添助剤を、必要に応じて添加することができる。原紙の抄紙条件については、酸性抄紙、中性抄紙、弱アルカリ抄紙等のいずれの方式でも良い。 The pulp constituting the base paper is subjected to a beating process, and then sent to a paper machine as a paper stock which is a slurry-like pulp aqueous dispersion. For this paper material, fillers, internally added sizing agents, anionic, nonionic, cationic or amphoteric retention improvers, drainage improvers, paper strength enhancers, etc. It can be added as necessary. As for the papermaking conditions of the base paper, any system such as acidic papermaking, neutral papermaking, and weak alkali papermaking may be used.
本発明で、紙料中に添加し、原紙の形成に使用する填料としては、例えば、重質炭酸カルシウム、軽質炭酸カルシウム、亜硫酸カルシウム、石膏、タルク、クレー、焼成カオリン、ホワイトカーボン、非晶質シリカ、デラミネーテッドカオリン、珪藻土、炭酸マグネシウム、二酸化チタン、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、水酸化亜鉛等の無機顔料や、尿素・ホルマリン樹脂微粒子、微小中空粒子等の有機顔料等が例示でき、古紙や損紙等に含まれる填料も再使用できる。填料は2種類以上の混合使用も可能である。填料の配合量は、一般に紙(原紙)灰分が3〜30質量%の範囲となるように添加され、層間強度や不透明度を良好とするために好ましくは5〜25質量%となるように添加される。 In the present invention, the filler added to the stock and used to form the base paper includes, for example, heavy calcium carbonate, light calcium carbonate, calcium sulfite, gypsum, talc, clay, calcined kaolin, white carbon, amorphous Inorganic pigments such as silica, delaminated kaolin, diatomaceous earth, magnesium carbonate, titanium dioxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, organic pigments such as urea / formalin resin fine particles, micro hollow particles, etc. The filler contained in waste paper, waste paper, etc. can also be reused. Two or more fillers can be used in combination. The filler is generally added so that the paper (base paper) ash content is in the range of 3 to 30% by mass, and preferably 5 to 25% by mass in order to improve the interlayer strength and opacity. Is done.
本発明で紙料中に添加し、原紙の形成に使用する内添サイズ剤の具体例としては、例えば、アルキルケテンダイマー系、アルケニル無水コハク酸系、スチレン−アクリル系、高級脂肪酸系、石油樹脂系、ロジン系などのサイズ剤が挙げられる。
また、歩留向上剤、濾水性向上剤、紙力増強剤の具体例としては、例えば、アルミニウム等の多価金属化合物(具体的には硫酸バンド、塩化アルミニウム、アルミン酸ソーダ、塩基性アルミニウム化合物等)、各種澱粉類、ポリアクリルアミド、尿素樹脂、ポリアミドポリアミン樹脂、ポリエチレンイミン、ポリアミン、ポリビニルアルコール、ポリエチレンオキサイド等が例示できる。
Specific examples of the internal sizing agent added to the stock in the present invention and used to form the base paper include, for example, alkyl ketene dimer type, alkenyl succinic anhydride type, styrene-acrylic type, higher fatty acid type, petroleum resin And sizing agents such as rosin and rosin.
Specific examples of yield improvers, drainage improvers, and paper strength enhancers include, for example, polyvalent metal compounds such as aluminum (specifically, sulfate bands, aluminum chloride, sodium aluminate, basic aluminum compounds). Etc.), various starches, polyacrylamide, urea resin, polyamide polyamine resin, polyethyleneimine, polyamine, polyvinyl alcohol, polyethylene oxide and the like.
本発明の効果を妨げない範囲で、パルプ繊維間結合の阻害機能を有する嵩高剤、柔軟剤を使用することも可能である。嵩高剤、柔軟剤の具体例としては、例えば、多価アルコールと脂肪酸のエステル化合物、多価アルコールと脂肪酸エステル化合物のポリオキシアルキレン化合物、脂肪酸ポリアミドアミン、多価アルコール系界面活性剤、油脂系非イオン界面活性剤等が例示できる。かかる嵩高剤、柔軟剤の添加量は、一般に、乾燥重量対比でパルプに対して0.05〜2.0質量%程度である。 It is also possible to use a bulking agent and a softening agent having a function of inhibiting the binding between pulp fibers as long as the effects of the present invention are not disturbed. Specific examples of bulking agents and softeners include, for example, ester compounds of polyhydric alcohols and fatty acids, polyoxyalkylene compounds of polyhydric alcohols and fatty acid ester compounds, fatty acid polyamidoamines, polyhydric alcohol surfactants, An ionic surfactant etc. can be illustrated. The amount of the bulking agent and the softening agent is generally about 0.05 to 2.0% by mass relative to the pulp in terms of dry weight.
スラリー状のパルプ水分散液に必要な填料・薬剤を添加した紙料からシート状の原紙を形成するための原紙の抄造(フォーマー)形式としては特に制限はなく、丸網・長網式フォーマー、オントップフォーマー、ギャップフォーマー等を例示することができる。ギャップフォーマー形式の抄紙機としては、ブレードフォーミング型、ロールフォーミング型、およびこれらの複合型があるが、いずれも使用できる。塗工紙に非塗工紙風合いを与えるために原紙表面性を制御するためには丸網・長網式フォーマーを用いることが好ましい。 There are no particular restrictions on the form of the base paper used to form the base paper from the stock containing the filler and chemicals necessary for the slurry-like pulp water dispersion. An on-top former, a gap former, etc. can be illustrated. The gap former type paper machine includes a blade forming type, a roll forming type, and a composite type of these, and any of them can be used. In order to control the surface property of the base paper in order to give the coated paper a non-coated paper texture, it is preferable to use a round net / long net former.
抄紙される原紙の坪量としては特に限定されないが、通常、30〜400g/m2の範囲に設定される。塗工紙に非塗工紙風合いを付与する観点からは、塗工前の原紙表面平滑性が過度に高いと好ましくないため、抄紙される原紙の坪量下限としては50g/m2以上が好ましい。プレスパートを経た原紙は、ドライヤーにより乾燥され、所望の水分量とした後に、必要に応じてサイズプレス工程に送られるか、顔料塗工層形成のための塗工工程に送られる。 The basis weight of the base paper to be made is not particularly limited, but is usually set in the range of 30 to 400 g / m 2 . From the viewpoint of imparting a non-coated paper texture to the coated paper, it is not preferable if the surface smoothness of the base paper before coating is excessively high, and therefore the basis weight lower limit of the base paper to be made is preferably 50 g / m 2 or more. . The base paper that has passed through the press part is dried by a drier to obtain a desired amount of water, and then sent to a size press process as necessary or to a coating process for forming a pigment coating layer.
サイズプレス工程においては、得られる塗工紙の表面強度向上、ならびに顔料塗工層を設ける効果を効率よく発揮させるために、原紙への塗工液浸透を抑制することを目的として、澱粉やポリビニルアルコール、ポリアクリルアミド等、天然もしくは合成の水溶性高分子を含有する水溶液あるいはエマルジョン型高分子が、原紙に塗工される。サイズプレス工程において、顔料を含まない、いわゆるクリアサイズを行う際の塗工量としては、サイズプレスの効果発現、および乾燥負荷の増大による操業性低下回避を考慮すると、原紙片面当たりの固形分塗工量として0.1〜3.0g/m2が好ましく、0.2〜2.0g/m2がより好ましい。サイズプレス工程において顔料を含有した塗工液を塗工する、いわゆるピグメントサイズプレスを行うこともできる。 In the size press process, in order to efficiently improve the surface strength of the resulting coated paper and to effectively exhibit the effect of providing a pigment coating layer, starch or polyvinyl is used for the purpose of suppressing coating liquid penetration into the base paper. An aqueous solution or an emulsion type polymer containing a natural or synthetic water-soluble polymer such as alcohol or polyacrylamide is applied to the base paper. In the size press process, the amount of coating when performing a so-called clear size that does not contain a pigment, considering the manifestation of the effect of the size press and the avoidance of operability deterioration due to an increase in the drying load, preferably 0.1 to 3.0 g / m 2 as coated amount, 0.2 to 2.0 g / m 2 is more preferable. A so-called pigment size press in which a coating liquid containing a pigment is applied in the size press step can also be performed.
サイズプレス工程における塗工装置としては、サイズプレス工程における塗工液が顔料を含まないクリアサイズプレスであるか、顔料を含むピグメントサイズプレスであるかにかかわらず、2ロールコーター、ゲートロールコーター等の公知のサイズプレスコーターが使用できる。断紙等のトラブルによる生産効率低下回避、塗工の均一性確保のため、フィルムトランスファー方式のロール塗工装置であることが好ましい。フィルムトランスファー方式のロール塗工装置としては、計量装置としてブレードまたはロッドを使用することにより、原紙に接する前のロール表面上にあらかじめ所望の塗工液量を計量し、この塗工液を原紙に接触、転移させることでサイズプレス、すなわち塗工が実施される。計量装置として、装置の耐久性を考慮すると、ロッドを使用したロッドメタリングサイズプレスであることがより好ましい。 As a coating device in the size press process, regardless of whether the coating liquid in the size press process is a clear size press containing no pigment or a pigment size press containing a pigment, a two-roll coater, a gate roll coater, etc. Any known size press coater can be used. In order to avoid a decrease in production efficiency due to troubles such as paper breakage and to ensure coating uniformity, a film transfer type roll coating apparatus is preferable. A film transfer type roll coating device uses a blade or a rod as a measuring device to measure the desired amount of coating liquid on the surface of the roll before contacting the base paper, and apply this coating liquid to the base paper. A size press, that is, coating is carried out by contacting and transferring. In consideration of the durability of the device, the metering device is more preferably a rod metering size press using a rod.
サイズプレス工程を経た後、サイズプレス塗工層はドライヤーで乾燥され、顔料塗工層塗工工程に送られるが、サイズプレス工程前、あるいはサイズプレス工程後の乾燥が完了した後から顔料塗工層塗工工程前の間において、本発明の所望の効果を損なわない範囲で、必要に応じて、金属ロール/金属ロールの組み合わせによるマシンカレンダー、あるいは金属ロール/弾性ロールの組み合わせであって金属ロールを加温したソフトカレンダー、金属ロール/弾性ロールの組み合わせであって金属ロールを加温しないスムーザー等による平滑化仕上げ処理を施すこともできる。得られる塗工紙の非塗工紙風合いを維持するためには、サイズプレス工程から顔料塗工層塗工工程の間においては、平滑化処理を施さないことが好ましい。 After passing through the size press process, the size press coating layer is dried with a dryer and sent to the pigment coating layer coating process, but the pigment coating is performed before the size pressing process or after drying after the size pressing process is completed. Before the layer coating process, as long as the desired effect of the present invention is not impaired, a machine calendar by a combination of a metal roll / metal roll, or a combination of a metal roll / elastic roll, if necessary, and a metal roll It is also possible to perform a smoothing finishing process using a smoother or the like which is a combination of a soft calender, a metal roll / elastic roll, and does not heat the metal roll. In order to maintain the uncoated paper texture of the resulting coated paper, it is preferable not to perform a smoothing treatment between the size press step and the pigment coating layer coating step.
顔料塗工層を形成する塗工装置としては、非接触計量形式による塗工装置を用いることが必要である。非接触計量形式による塗工装置を用いることによって、接触計量形式による塗工装置を使用した場合と比較して顔料塗工層の塗工層厚みをより均一にする効果が得られ、これにより原紙表面の凹凸を過度に被覆して非塗工紙風合いを損なうことを回避することができる。ここで、非接触計量形式による塗工装置とは、塗工行程において原紙上に塗工液が供給された後、ブレードでの掻き落としやロールニップでの計量を行うなど、計量部が原紙上の塗料に物理的に接触して計量を行う接触計量形式の塗工装置でなく、原紙上の塗料へ物理的な接触をせずに計量を行うことができる塗工装置を言い、いわゆる前計量タイプの塗工装置や、後計量タイプの塗工装置であっても空気流により計量を行う塗工装置を言う。非接触計量形式による塗工装置の具体例としては、エアーナイフコーター、カーテンコーター、スロットダイコーター、スプレーコーターが挙げられる。 As a coating apparatus for forming the pigment coating layer, it is necessary to use a non-contact metering type coating apparatus. By using a non-contact metering type coating device, the effect of making the coating layer thickness of the pigment coating layer more uniform than when using a contact metering type coating device is obtained. It can be avoided that the surface unevenness is excessively covered and the texture of the non-coated paper is impaired. Here, the non-contact coating type coating device means that after the coating liquid is supplied onto the base paper in the coating process, the measuring section is on the base paper, such as scraping with a blade or measuring at the roll nip. It is not a contact-measuring type coating device that physically contacts the paint, but a coating device that can measure without physical contact with the paint on the base paper. This means a coating apparatus that performs measurement by airflow even if it is a coating apparatus or a post-measuring type coating apparatus. Specific examples of the non-contact metering type coating apparatus include an air knife coater, a curtain coater, a slot die coater, and a spray coater.
本発明において、顔料塗工層に使用される顔料については、平均粒子径が2.0〜4.0μmであるタルクを該顔料100質量部中5質量部以上40質量未満含有させることが必須である。 In the present invention, it is essential that the pigment used in the pigment coating layer contains talc having an average particle size of 2.0 to 4.0 μm in an amount of 5 parts by mass or more and less than 40 parts by mass in 100 parts by mass of the pigment. is there.
ここで、本発明で言う顔料の平均粒子径とは、一般的なミキサーによって分散を行った顔料分散液または顔料スラリーをピロリン酸ナトリウム(商品名:ナンカリンS−1、燐化学工業株式会社製)の0.1%液中で顔料濃度が5%となるように調整し、さらに超音波で5分間分散処理し、セディグラフ5100(マイクロメリティクス社製)を用いて沈降法により測定した際の、粗粒子分側からの累積質量が50%に相当する点での質量平均粒子径を言う。 Here, the average particle diameter of the pigment referred to in the present invention is a sodium pyrophosphate (trade name: Nankaline S-1, manufactured by Rin Kagaku Kogyo Co., Ltd.). In the 0.1% solution, the pigment concentration was adjusted to 5%, further subjected to dispersion treatment with ultrasonic waves for 5 minutes, and measured by the sedimentation method using Sedigraph 5100 (manufactured by Micromeritics). The mass average particle diameter at the point where the cumulative mass from the coarse particle component side corresponds to 50%.
顔料塗工層中のタルクの含有量が5質量部未満の場合や平均粒子径が2.0μm未満である場合、コスレ傷やコスレ汚れの改善効果が乏しく、他方タルクの含有量が40質量部以上となると、塗工紙表面の非塗工紙風合いが損なわれる。また、平均粒子径が4.0μmを越えると、非接触計量方式による塗工装置で塗工する場合には、コスレ汚れが劣る、インキ乾燥性が低下する等の問題を生じる。 When the content of talc in the pigment coating layer is less than 5 parts by mass or when the average particle size is less than 2.0 μm, the effect of improving the scratches and stains is poor, while the content of talc is 40 parts by mass. If it becomes above, the texture of the non-coated paper on the coated paper surface will be impaired. On the other hand, when the average particle diameter exceeds 4.0 μm, problems such as poor stains and reduced ink drying properties occur when coating with a non-contact metering type coating apparatus.
前記顔料塗工層に使用する顔料として、さらに平均粒子径が0.5〜1.0μmであるデラミネーテッドカオリンを顔料100質量部中30質量部以下含有することで、コスレ汚れを更に良好とすることができるため好ましい。
デラミネーテッドカオリンの平均粒子径が0.5μm未満の場合、デラミネーテッドカオリン配合によるコスレ汚れ向上効果が発現されにくく、他方、平均粒子径が1.0μmを越えると、インキ乾燥性が低下したりコスレ汚れ改善効果が発現しにくくなる場合がある。また、デラミネーテッドカオリンの配合量が30質量部を越えると、塗工紙表面の非塗工紙風合いが損なわる可能性がある。
As a pigment to be used for the pigment coating layer, further including a delaminated kaolin having an average particle diameter of 0.5 to 1.0 μm in an amount of 30 parts by mass or less in 100 parts by mass of the pigment, the cosmetic stain is further improved. This is preferable because it can be performed.
When the average particle size of the delaminated kaolin is less than 0.5 μm, the effect of improving the smear due to the blend of the delaminated kaolin is hardly expressed. On the other hand, when the average particle size exceeds 1.0 μm, the ink drying property is lowered. In some cases, it may be difficult to achieve the effect of improving the cosmetic stain. Moreover, when the compounding quantity of a delaminated kaolin exceeds 30 mass parts, the texture of the non-coated paper on the coated paper surface may be impaired.
前記顔料塗工層に使用する重質炭酸カルシウムとしては、平均粒子径が0.5〜1.0μmであり、かつ、粒子径0.2μm以下の粒子の割合が15%未満である重質炭酸カルシウムであることがさらに好ましい。該重質炭酸カルシウムを含有させることで、そうでない場合と比較してインキ乾燥性を良好としつつ印刷光沢をより良好とすることができるため、好ましい実施態様である。 The heavy calcium carbonate used for the pigment coating layer has an average particle diameter of 0.5 to 1.0 μm and a ratio of particles having a particle diameter of 0.2 μm or less of less than 15%. More preferably, it is calcium. The inclusion of the heavy calcium carbonate is a preferred embodiment because the printing gloss can be improved while the ink drying property is improved as compared with the case where it is not.
また、前記顔料塗工層に平均粒子径が0.2〜0.6μmである立方形状軽質炭酸カルシウムを顔料100質量部中10〜30部含有することで、印刷光沢を更に良好とできるため、より好ましい。 In addition, since the pigment coating layer contains 10 to 30 parts of cubic light calcium carbonate having an average particle diameter of 0.2 to 0.6 μm in 100 parts by mass of the pigment, the printing gloss can be further improved. More preferred.
本発明の塗工ファンシー紙において、顔料塗工層に使用される、本発明で規定する顔料以外の顔料の使用については、本発明の塗工ファンシー紙が奏する効果を妨げない限り特に制限されるものではなく、例えば、通常のカオリン、焼成カオリン、構造化カオリン、エンジニアードカオリン、デラミネーテッドカオリン等の各種カオリン、重質炭酸カルシウム(粉砕炭酸カルシウム)などの精製した天然鉱物顔料、軽質炭酸カルシウム(合成炭酸カルシウム)、炭酸カルシウムと他の親水性有機化合物との複合合成顔料、サチンホワイト、硫酸バリウム、硫酸亜鉛、二酸化チタン、シリカ、アルミナ、水酸化アルミニウム、酸化亜鉛、炭酸マグネシウム、中空もしくは密実である有機顔料のプラスチックピグメント、接着剤ピグメント、プラスチックビーズ、マイクロカプセルなどを本発明の効果を阻害しない範囲で適宜混合、使用することもできる。 In the coated fancy paper of the present invention, the use of a pigment other than the pigment specified in the present invention used in the pigment coating layer is particularly limited as long as the effect of the coated fancy paper of the present invention is not hindered. For example, ordinary kaolin, calcined kaolin, structured kaolin, engineered kaolin, various kaolins such as delaminated kaolin, purified natural mineral pigments such as heavy calcium carbonate (ground calcium carbonate), light calcium carbonate (Synthetic calcium carbonate), composite synthetic pigment of calcium carbonate and other hydrophilic organic compounds, satin white, barium sulfate, zinc sulfate, titanium dioxide, silica, alumina, aluminum hydroxide, zinc oxide, magnesium carbonate, hollow or dense Real organic pigment plastic pigment, adhesive pigment, plastic Tic beads, mixed appropriately within a range not impairing the effects of the present invention and microcapsules may also be used.
塗工層に用いられる接着剤としては、天然植物から精製した澱粉、ヒドロキシエチル化澱粉、酸化澱粉、エーテル化澱粉、リン酸エステル化澱粉、酵素変性澱粉やそれらをフラッシュドライして得られる冷水可溶性澱粉等の各種澱粉、および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、ヒドロキシプロピルセルロース等の澱粉誘導体、デキストリン、マンナン、キトサン、アラビノガラクタン、グリコーゲン、イヌリン、ペクチン、ヒアルロン酸等の天然多糖類およびそのオリゴマーさらにはその変性体が挙げられる。さらに、カゼイン、ゼラチン、大豆蛋白、コラーゲンなどの天然タンパク質およびその変性体、ポリ乳酸、ペプチドなどの合成高分子やオリゴマーが挙げられる。加えて、スチレンブタジエン系、アクリル系、ポリ酢酸ビニル、エチレン酢酸ビニルなどの各共重合体ラテックス、ポリビニルアルコール、変性ポリビニルアルコール、ポリビニルピロリドン、変成ポリビニルピロリドン、ポリアクリル酸ナトリウム、ポリエチレンオキシド、ポリアクリルアミド、ユリアまたはメラミン/ホルマリン樹脂、ポリエチレンイミン、ポリアミドポリアミン/エピクロルヒドリンなどの水溶性合成物などが挙げられる。これらは一種以上で使用することができる。この他、公知の天然、合成有機化合物を使用することは特に限定されない。 Adhesives used in the coating layer include starch purified from natural plants, hydroxyethylated starch, oxidized starch, etherified starch, phosphate esterified starch, enzyme-modified starch, and cold water soluble obtained by flash drying them Various starches such as starch, starch derivatives such as carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, natural polysaccharides such as dextrin, mannan, chitosan, arabinogalactan, glycogen, inulin, pectin, hyaluronic acid and oligomers thereof Examples include modified products. Furthermore, natural polymers such as casein, gelatin, soybean protein, and collagen, and modified products thereof, and synthetic polymers and oligomers such as polylactic acid and peptides can be mentioned. In addition, copolymer latex such as styrene butadiene, acrylic, polyvinyl acetate, ethylene vinyl acetate, polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl pyrrolidone, modified polyvinyl pyrrolidone, sodium polyacrylate, polyethylene oxide, polyacrylamide, Examples include water-soluble synthetic compounds such as urea or melamine / formalin resin, polyethyleneimine, polyamidepolyamine / epichlorohydrin. One or more of these can be used. In addition, the use of a known natural or synthetic organic compound is not particularly limited.
接着剤として用いることができるスチレンブタジエン系共重合体ラテックス(以下、SBRラテックスと記す)としては、ラテックス粒子の平均粒子径が50〜120nmである場合、接着剤使用量を削減でき、インキ乾燥性改善にも寄与できることから好ましい。SBRラテックス使用量とインキ乾燥性のバランスの観点からは、SBRラテックス平均粒子径としては、60〜90nmであることがより好ましい。ラテックスの平均粒子径は、ラテックスをオスミウム酸で処理し、これを透過型電子顕微鏡で倍率5万倍で写真撮影し、得られた顕微鏡写真の重合体ラテックス粒子の約200個の粒子径を測定し数平均で求めるか、より簡便な方法として、サブミクロン粒子アナライザーモデルN4(ベックマンコールター社製)による測定でも求めることができる。 As a styrene butadiene copolymer latex (hereinafter referred to as SBR latex) that can be used as an adhesive, when the average particle diameter of the latex particles is 50 to 120 nm, the amount of adhesive used can be reduced, and the ink drying property can be reduced. It is preferable because it can contribute to improvement. From the viewpoint of the balance between the amount of SBR latex used and the ink drying property, the SBR latex average particle size is more preferably 60 to 90 nm. The average particle size of the latex is obtained by treating the latex with osmic acid, photographing it with a transmission electron microscope at a magnification of 50,000 times, and measuring the particle size of about 200 polymer latex particles in the resulting micrograph. It can also be obtained by a number average, or as a simpler method, it can also be obtained by measurement using a submicron particle analyzer model N4 (manufactured by Beckman Coulter).
また、必要に応じて塗工液に用いられる増粘剤としては、メチルセルロース、カルボキシメチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体、アルギン酸ソーダ、キサンタンガム、グアーガム等のガム類、カゼイン、ポリアクリル酸ソーダなどの水溶性高分子、ポリアクリル酸塩、スチレンマレイン酸無水共重合体などの合成重合体、珪酸塩などの無機重合体などが挙げられる。 In addition, as a thickener used in the coating liquid as necessary, cellulose derivatives such as methyl cellulose, carboxymethyl cellulose, hydroxymethyl cellulose, gums such as sodium alginate, xanthan gum, guar gum, water solubles such as casein, sodium polyacrylate, etc. Synthetic polymers such as water-soluble polymers, polyacrylates and styrene-maleic anhydride copolymers, and inorganic polymers such as silicates.
さらに、必要に応じて、分散剤、濡れ剤、流動性改質剤、消泡剤、耐水化剤、印刷適性向上剤、防腐剤、スライムコントロール剤、着色剤などの通常使用されている各種助剤、およびこれらの各種助剤をカチオン化したものが好適に用いられる。 In addition, if necessary, various commonly used assistants such as dispersants, wetting agents, fluidity modifiers, antifoaming agents, water resistance agents, printability improvers, preservatives, slime control agents, and coloring agents. Agents and those obtained by cationizing these various auxiliary agents are preferably used.
塗工紙の白色度を調整するために蛍光染料を使用する場合、接着剤としてポリビニルアルコールを併用することで、ポリビニルアルコールが蛍光染料のキャリアーとして作用し、蛍光染料の原紙への過度な移動を抑止して良好な蛍光増白作用を示すために好ましい。 When a fluorescent dye is used to adjust the whiteness of the coated paper, the polyvinyl alcohol acts as a carrier of the fluorescent dye by using polyvinyl alcohol as an adhesive, and excessive movement of the fluorescent dye to the base paper is prevented. It is preferable for suppressing and showing a good fluorescent whitening effect.
顔料塗工層を形成するための水性塗工液の塗工時の塗料固形分濃度についても、特に制限はないが、所望の塗工量とするためには塗料固形分濃度として20〜55質量%の範囲で調節され、より好ましくは25〜45質量%に調節される。 There is no particular limitation on the solid content concentration of the aqueous coating liquid for forming the pigment coating layer, but there is no particular limitation, but in order to obtain a desired coating amount, the solid content concentration of the paint is 20 to 55 mass. %, And more preferably 25 to 45% by mass.
顔料塗工層の塗工量は、得られる塗工紙で非塗工紙風合いを維持した状態で、白紙品質、印刷品質、および塗工・加工適性等を考慮すると、片面当たり3〜15g/m2の範囲に調整される。片面当たりの塗工量として好ましくは4〜12g/m2で調節される。塗工量が3g/m2未満では、顔料塗工層を設けたことによる印刷適性の向上が期待できず、他方、塗工量が15g/m2を越える場合、非塗工紙風合いが損なわれる。 The coating amount of the pigment coating layer is 3 to 15 g / side, considering the blank paper quality, print quality, suitability for coating and processing, etc. while maintaining the texture of the non-coated paper with the obtained coated paper. It is adjusted to a range of m 2. The coating amount per side is preferably adjusted to 4 to 12 g / m 2 . When the coating amount is less than 3 g / m 2 , the improvement in printability due to the provision of the pigment coating layer cannot be expected. On the other hand, when the coating amount exceeds 15 g / m 2 , the uncoated paper texture is impaired. It is.
原紙上に設ける顔料塗工層の層数としては、原紙片面あたり1層以上であることが必要であるが、原紙の表面凹凸を過度に平滑させて非塗工紙風合いを損なわせることのないようにすることが必要であるため、原紙片面あたりの顔料塗工層の層数としては1層であることが好ましい。 The number of pigment coating layers provided on the base paper needs to be one or more per one side of the base paper, but the surface unevenness of the base paper is not excessively smoothed and the texture of the non-coated paper is not impaired. Therefore, it is preferable that the number of the pigment coating layers per one side of the base paper is one.
顔料塗工層を設けた後、一般塗工紙製造の場合の様にスーパーカレンダー装置による平滑化処理を行うこともできる。使用可能なカレンダー装置としては、ハードニップカレンダー、スーパーカレンダー、ソフトカレンダー、グロスカレンダー等のグロス仕上げをするカレンダー装置が挙げられる。非塗工紙風合いを維持させる観点からは、線圧100kN/m以下で2ニップ以下のカレンダー処理とすることが好ましく、線圧が50kN/m以下であることがより好ましく、平滑化処理は行わないことが最も好ましい。 After providing the pigment coating layer, a smoothing process using a super calender device can be performed as in the case of production of general coated paper. Examples of the calendar device that can be used include a calendar device that performs gloss finishing such as a hard nip calendar, a super calendar, a soft calendar, and a gloss calendar. From the viewpoint of maintaining the texture of the non-coated paper, it is preferable to use a calendering process with a linear pressure of 100 kN / m or less and 2 nips or less, more preferably a linear pressure of 50 kN / m or less, and a smoothing process is performed. Most preferably not.
また、得られた塗工紙に対して、エンボスロールを使用して表面に凹凸パターンを付与するエンボス処理を行うこともできる。エンボス処理による塗工層厚密変化に起因して印刷均一性が変化することを防ぐ観点からは、エンボス処理は行わないことが好ましい。 Moreover, the embossing process which provides an uneven | corrugated pattern on the surface using an embossing roll can also be performed with respect to the obtained coated paper. From the viewpoint of preventing the printing uniformity from changing due to the change in the coating layer thickness due to the embossing treatment, it is preferable not to perform the embossing treatment.
以下に、実施例を挙げて本発明をより具体的に説明するが,本発明は実施例の範囲に限定されるものでない。なお、例中の「部」及び「%」は特に断わらない限り、「質量部(固型分)」及び「質量%」を示す。 Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the scope of the examples. In the examples, “parts” and “%” indicate “parts by mass (solid component)” and “mass%” unless otherwise specified.
(紙基材の調製)
LBKP100部に、填料として軽質炭酸カルシウム(商品名:タマパールTP−121、奥多摩工業社製)を10部添加した後、パルプスラリーの全固形分に対して硫酸アルミニウム1.5%、カチオン澱粉(商品名:エースK100、王子コーンスターチ社製)0.5%、アルキルケテンダイマーサイズ剤(商品名:サイズパインK−287、荒川化学社製)0.4%、ポリアクリルアミド(商品名:ポリストロン851、荒川化学社製)1.5%を順次添加し、紙料を調製した。この紙料を長網式フォーマーにて抄紙し、坪量107.9g/m2の原紙を得た。
(Preparation of paper substrate)
After adding 10 parts of light calcium carbonate (trade name: Tama Pearl TP-121, manufactured by Okutama Kogyo Co., Ltd.) as a filler to 100 parts of LBKP, 1.5% aluminum sulfate, cationic starch (commodity) with respect to the total solid content of the pulp slurry Name: Ace K100, manufactured by Oji Cornstarch Co., Ltd.) 0.5%, alkyl ketene dimer sizing agent (trade name: Size Pine K-287, manufactured by Arakawa Chemical Co., Ltd.) 0.4%, polyacrylamide (trade name: Polystron 851, Arakawa Chemical Co., Ltd.) 1.5% was sequentially added to prepare a paper stock. This stock was made with a long web former to obtain a base paper having a basis weight of 107.9 g / m 2 .
(塗工液の調整)
タルクに分散剤(商品名:アロンT−50、東亞合成社製)0.4部を添加し、濃度60%のスラリーを調製した。また、デラミネーテッドカオリンに分散剤(商品名:アロンT−50、前出)0.1部を添加し、濃度70%のスラリーを調製した。粉体で供給される軽質炭酸カルシウムは、分散剤(商品名:アロンT−50、前出)0.3部を添加し、濃度55%のスラリーを調製した。
タルクスラリー、デラミネーテッドカオリンスラリー、重質炭酸カルシウムスラリー、軽質炭酸カルシウムスラリーを表1にある配合にて加えて攪拌した後、澱粉(商品名:エースA、王子コーンスターチ株式会社製)3部とラテックス(商品名:OJ−3000H、JSR株式会社製、平均粒子径80nm)15部を加え、さらに助剤として消泡剤および染料を順次加え、更に水を加えて顔料塗工層用水性塗工液を得た。表1〜表4に記載の実施例及び比較例の塗工ファンシー紙には以下の顔料を用いた。
(Adjustment of coating solution)
0.4 parts of a dispersant (trade name: Aron T-50, manufactured by Toagosei Co., Ltd.) was added to talc to prepare a slurry having a concentration of 60%. Further, 0.1 part of a dispersant (trade name: Aron T-50, supra) was added to delaminated kaolin to prepare a slurry having a concentration of 70%. Light calcium carbonate supplied as a powder was prepared by adding 0.3 part of a dispersant (trade name: Aron T-50, supra) to prepare a slurry having a concentration of 55%.
After adding talc slurry, delaminated kaolin slurry, heavy calcium carbonate slurry and light calcium carbonate slurry in the formulation shown in Table 1 and stirring, 3 parts starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) Add 15 parts of latex (trade name: OJ-3000H, manufactured by JSR Corporation, average particle size 80 nm), add antifoaming agent and dye sequentially as an auxiliary agent, add water and add water for pigment coating layer. A liquid was obtained. The following pigments were used for the coated fancy papers of Examples and Comparative Examples described in Tables 1 to 4.
(タルク種類)
T1:商品名 PD―680、WMC Industrial Minerals社製、平均粒子径2.8μm
T2:商品名 ミクロエースP−3、日本タルク株式会社製、平均粒子径1.8μm
T3:商品名 タルク80、株式会社勝光山鉱業所製、平均粒子径5.0μm
(Talc type)
T1: Trade name PD-680, manufactured by WMC Industrial Minerals, average particle size 2.8 μm
T2: Product name Microace P-3, manufactured by Nippon Talc Co., Ltd., average particle size 1.8 μm
T3: Product name Talc 80, manufactured by Katsumiyama Mining Co., Ltd., average particle size 5.0 μm
(カオリン種類)
D1:デラミネーテッドカオリン、商品名 ハイドラシーン、KaMin社製、平均粒子径:0.14μm
D2:デラミネーテッドカオリン、商品名 アストラプレート、株式会社イメリスミネラルズ・ジャパン製、平均粒子径:0.96μm
D3:デラミネーテッドカオリン、商品名 カピムDG、株式会社イメリスミネラルズ・ジャパン製、平均粒子径:0.61μm
D4:デラミネーテッドカオリン、商品名:NuSurf、BASF社製、平均粒子径:2.1μm
(Kaolin type)
D1: Delaminated kaolin, trade name Hydra scene, manufactured by KaMin, average particle size: 0.14 μm
D2: Delaminated kaolin, trade name Astra Plate, manufactured by Imerizu Minerals Japan, average particle size: 0.96 μm
D3: Delaminated kaolin, trade name Capim DG, manufactured by Imerys Minerals Japan, average particle size: 0.61 μm
D4: Delaminated kaolin, trade name: NuSurf, manufactured by BASF, average particle size: 2.1 μm
(重質炭酸カルシウム種類)
G1:商品名 ハイドロカーブ90、株式会社ファイマテック製、平均粒子径:0.64μm、0.2μm以下の粒子割合:17%
G2:株式会社ファイマテック製、平均粒子径0.64μm、0.2μm以下の粒子割合:9%
G3:商品名 エスカロン1500、三共製粉株式会社製、平均粒子径:2.2μm、0.2μm以下の粒子割合:2%
(Heavy calcium carbonate type)
G1: Product name Hydrocurve 90, manufactured by Phimatech Co., Ltd., average particle size: 0.64 μm, ratio of particles of 0.2 μm or less: 17%
G2: manufactured by Pfema Tech Co., Ltd., average particle size 0.64 μm, proportion of particles having a size of 0.2 μm or less: 9%
G3: Trade name Escaron 1500, manufactured by Sankyo Flour Milling Co., Ltd., average particle size: 2.2 μm, particle ratio of 0.2 μm or less: 2%
(軽質炭酸カルシウム種類)
P1:商品名 TP−221GS、奥多摩工業株式会社製、平均粒径0.45μm、紡錘形状
P2:商品名 ブリリアント15、白石カルシウム工業株式会社製、平均粒径0.34μm、立方形状
P3:商品名 タマパールTP−121、奥多摩工業株式会社製、平均粒径1.4μm、紡錘形状
(Light calcium carbonate type)
P1: Product name TP-221GS, manufactured by Okutama Kogyo Co., Ltd., average particle size 0.45 μm, spindle shape P2: Product name Brilliant 15, manufactured by Shiroishi Calcium Industry Co., Ltd., average particle size 0.34 μm, cubic shape P3: Product name Tama Pearl TP-121, manufactured by Okutama Kogyo Co., Ltd., average particle size 1.4 μm, spindle shape
(塗工紙の作成)
原紙に対し、水性塗工液を表1記載の塗工方式にて塗工し、乾燥重量塗工量として片面当たり表1記載の塗工量となるように原紙の両面に顔料塗工層を設けた。
実施例16においては、平均粒子径80nmであるラテックス「OJ−3000H」を、異なるラテックス(商品名:T−2535D、JSR株式会社製、平均粒子径115nm)に変更し、さらにラテックス配合部数を15部から20部に変更した。
実施例18においては、金属ロールと樹脂ロールからなるスーパーカレンダーにて、線圧10kN/mの条件で2ニップの処理を行った。比較例7では、同一のスーパーカレンダーにて、線圧150kN/mの条件で4ニップの処理を行った。
実施例19においては、不規則な凹凸パターンを有する砂目エンボスロールを用い、塗工・乾燥工程後にニップ圧90kN/mにてエンボス加工を行った。
比較例13においては、タルクを使用せず、有機填料である中空プラスチックピグメント(商品名:AE852、JSR株式会社製、表1にてタルク種類の欄にPPと記載)を使用した。
(Creating coated paper)
Apply a water-based coating solution to the base paper using the coating method shown in Table 1, and apply a pigment coating layer to both sides of the base paper so that the dry weight coating amount is the coating amount shown in Table 1 per side. Provided.
In Example 16, the latex “OJ-3000H” having an average particle diameter of 80 nm was changed to a different latex (trade name: T-2535D, manufactured by JSR Corporation, average particle diameter of 115 nm), and the number of latex blending parts was 15 From 20 parts to 20 parts.
In Example 18, two nips were processed under the condition of a linear pressure of 10 kN / m using a super calender composed of a metal roll and a resin roll. In Comparative Example 7, 4 nips were processed under the condition of a linear pressure of 150 kN / m using the same super calendar.
In Example 19, a grain embossing roll having an irregular concavo-convex pattern was used, and embossing was performed at a nip pressure of 90 kN / m after the coating / drying step.
In Comparative Example 13, talc was not used, and a hollow plastic pigment (trade name: AE852, manufactured by JSR Corporation, described as PP in the column of talc type in Table 1) was used.
実施例及び比較例で得られた塗工紙の評価として、白紙光沢、印刷光沢、コスレ傷、コスレ汚れ、インキ乾燥性及び非塗工紙風合いについて、以下に従って評価を行い、評価結果を表1〜表4に示した。 As the evaluation of the coated paper obtained in Examples and Comparative Examples, blank paper gloss, printing gloss, rust scratches, rust stains, ink drying properties and uncoated paper texture were evaluated according to the following, and the evaluation results are shown in Table 1. To Table 4.
<白紙光沢評価>
ISO 8254−1(1999)に準じて、入射・受光角75度の光沢値を光沢度計(型式:GM−26D、村上色彩技術研究所社製)を使用して測定した。
<Blank gloss evaluation>
According to ISO 8254-1 (1999), the gloss value at an incident / light receiving angle of 75 degrees was measured using a gloss meter (model: GM-26D, manufactured by Murakami Color Research Laboratory Co., Ltd.).
<印刷光沢評価>
ISO 2813(1994)に準じて、入射・受光角60度の光沢値を光沢度計(型式:GM−26D、村上色彩技術研究所社製)を使用して測定した。
<Print gloss evaluation>
In accordance with ISO 2813 (1994), the gloss value at an incident / light receiving angle of 60 degrees was measured using a gloss meter (model: GM-26D, manufactured by Murakami Color Research Laboratory Co., Ltd.).
<コスレ傷評価>
染色堅ろう度用摩擦試験機(東洋精機製作所製)を用い、印刷していない塗工紙2枚を対向させ、500gの荷重を負荷した条件で4往復させてコスレ傷試験を行った。試験後、塗工紙の擦られた部分の擦られていない部分との光沢差を目視評価し、コスレ傷評価を行った。点数が高いほどコスレ傷が目立たずに良好である。
<Scratch assessment>
Using a friction tester for dyeing fastness (manufactured by Toyo Seiki Seisakusho), two uncoated papers were made to face each other and subjected to a four-way reciprocation under the condition that a load of 500 g was applied to conduct a scratch test. After the test, the difference in glossiness between the rubbed portion of the coated paper and the non-rubbed portion was visually evaluated, and a scratch was evaluated. The higher the score, the better the scratches are not noticeable.
<コスレ汚れ評価>
RI印刷試験機を用い、墨インキ(商品名:バリウスG墨Sタイプ、大日本インキ社製)を0.6g計量して展開し、各塗工紙に印刷を行った。印刷後、室温にて24時間放置してインキを乾燥させた後、染色堅ろう度用摩擦試験機(前出)を用い、印刷面と非印刷面を対向させ、500gの荷重を負荷した条件で4往復させてコスレ汚れ試験を行った。試験後、非印刷面の墨インキによる汚れ具合を目視評価し、コスレ汚れ評価を行った。点数が高いほどコスレ汚れが少なく良好である。
<Cosmetic dirt evaluation>
Using an RI printing tester, 0.6 g of black ink (trade name: Varius G black S type, manufactured by Dainippon Ink, Inc.) was weighed and developed, and printing was performed on each coated paper. After printing, let stand at room temperature for 24 hours to dry the ink, then use a friction tester for dyeing fastness (described above), with the printed surface and the non-printed surface facing each other, under a condition where a load of 500 g is applied. The cosmetic stain test was performed by reciprocating 4 times. After the test, the stain condition of the black ink on the non-printed surface was visually evaluated to evaluate the smudge. The higher the score is, the less the cosmetic stain is.
<インキ乾燥性評価>
RI印刷試験機を用い、墨インキ(商品名:バリウスG墨Sタイプ、大日本インキ社製)を0.6g計量して展開し、試験紙への印刷を施した後、印刷直後から時間間隔を変更してロールニップにおいて印刷面とカレンダー処理により平滑性を向上させた一般PPC用紙を対向させて圧着し、PPC用紙へのインキ転移性を比較した。PPC用紙へのインキ転移性が高いほどインキ乾燥性が劣るとして判断し、インキ転移性をインキ乾燥性として目視評価して、インキ乾燥性評価を行った。点数が高いほど、インキ乾燥性が良好である。
<Evaluation of ink drying properties>
Using an RI printing tester, 0.6 g of black ink (trade name: Varius G black S type, manufactured by Dainippon Ink, Inc.) is weighed and developed, printed on test paper, and immediately after printing. In the roll nip, the printed surface and the general PPC paper whose smoothness was improved by calendaring were opposed to each other and pressed to compare the ink transfer properties to the PPC paper. It was judged that the higher the ink transfer property to the PPC paper, the lower the ink drying property, and the ink transfer property was visually evaluated as the ink drying property to evaluate the ink drying property. The higher the score, the better the ink drying property.
<非塗工紙風合い>
実施例・比較例で得られた塗工紙の非塗工紙風合いを、表面性を目視で評価するとともに、触感において塗工紙・非塗工紙いずれの感触に近いかを含め、総合的に評価した。点数が高いほど、非塗工紙風合いが良好である。
<Uncoated paper texture>
The non-coated paper texture of the coated paper obtained in the examples and comparative examples is evaluated by visual evaluation of the surface properties, and the touch feeling is comprehensive, including whether the coated paper or non-coated paper is close to the touch. Evaluated. The higher the score, the better the uncoated paper texture.
上記塗工紙の評価において、評価点数が4点以下の場合、品質が劣るため実用性が低い塗工紙である。 In the evaluation of the coated paper, when the evaluation score is 4 or less, the quality is inferior, and the coated paper is low in practicality.
本発明の塗工ファンシー紙は、非塗工紙風合いを有するマット調の塗工紙であって、塗工面にコスレ傷やコスレ汚れが発生しにくく、インキ乾燥性に優れているという印刷品質の極めて良好な高級感のある塗工ファンシー紙であるので、ファンシー紙の利用分野の拡大に寄与することが期待されるとともに、生産性の高いファンシー紙でもあるので、印刷用の塗工ファンシー紙の増大する需要にも十分に応えられるものである。 The coated fancy paper of the present invention is a mat-like coated paper having a texture of non-coated paper, which is less likely to cause scratches and stains on the coated surface, and has excellent printing quality such as excellent ink drying properties. Because it is a very good high-quality coated fancy paper, it is expected to contribute to the expansion of the fancy paper application field, and it is also a highly productive fancy paper. It can fully meet the increasing demand.
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