JP5791204B2 - Waterborne gravure coated paper - Google Patents
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本発明は、水性グラビア印刷において良好な適性を有する水性グラビア印刷用塗工紙に関する。
The present invention relates to an aqueous gravure coated printing paper having good aptitude in an aqueous gravure printing.
水性グラビア印刷は、広範囲な色調と高精細な再現性を備え、細かな文字も潰さずに再現することができる。また従来の油性グラビア印刷において困難だったハイライト部やグラデーションの安定したドットの再現性が可能になる。 Water-based gravure printing has a wide range of color tones and high-resolution reproducibility, and can reproduce fine characters without crushing. In addition, it becomes possible to reproduce dots with stable highlights and gradations that were difficult in conventional oil-based gravure printing.
水性グラビア印刷は、油性グラビア印刷では多色印刷しなければならない印刷領域をプロセスカラー５色を用いて印刷することができ、インキ総使用量の削減、揮発性有機化合物（ＶＯＣ）の排出量の削減が可能になり環境負荷の低減が可能となる。 Water-based gravure printing allows printing areas that must be printed in multiple colors in oil-based gravure printing using five process colors, reducing the total amount of ink used, and reducing the amount of volatile organic compounds (VOC) emitted. It becomes possible to reduce the environmental load.
しかし水性グラビア印刷に用いる水性グラビアインキは水の含有率が５０％以上であるためインキが乾燥しにくく、濡れ性が悪いなどの問題がある。
そのため従来のオフセット印刷用塗工紙を水性グラビア印刷に採用すると、水性グラビアインクの定着性や吸収性が悪いために、印刷ムラや印刷滲み（吸収されなかったインクが塗工紙面上を流れるインク泳ぎ）が発生するなどの問題があった。
However, the water-based gravure ink used for water-based gravure printing has a problem that the ink is difficult to dry and the wettability is poor because the water content is 50% or more.
For this reason, when conventional coated paper for offset printing is used for water-based gravure printing, the water-based gravure ink has poor fixability and absorbability, so printing unevenness and printing bleeding (ink that has not been absorbed will flow on the coated paper surface) There were problems such as swimming.
また印刷速度が高い時には印刷用塗工紙のインク吸収性にバラツキが発生し、インクが乾燥した後の最終的な印刷画像において定着したインクの濃度が不均一となる印刷ムラが顕著となり易いという問題がある。 Also, when the printing speed is high, the ink absorbability of the coated paper for printing varies, and printing unevenness in which the density of the fixed ink becomes non-uniform in the final printed image after the ink is dried is likely to be remarkable. There's a problem.
一方、紙器用原紙は、通常、印刷、製函等の加工をされて使用される。そのため要求される基礎特性は、印刷適性、製函適性などの加工適性が要求される。中でも剛度すなわちコシの強さは、一般的に重要な特性の一つであり、他の特性に悪い影響を及ぼさない限り、できるだけ剛度は高い方が望ましい。 On the other hand, base paper for paper containers is usually used after being subjected to processing such as printing and box making. Therefore, the required basic characteristics are required to be processability such as printability and boxing suitability. Among them, the rigidity, that is, the strength of the stiffness is one of the important characteristics in general, and it is desirable that the rigidity is as high as possible as long as the other characteristics are not adversely affected.
特許文献１はグラビア印刷用紙として優れた水性グラビア印刷適性、特にインク乾燥性およびインク発色性に優れたキャストコ−ト紙を開示した。
特許文献２はオフセット印刷用コート紙の様な外観を示し、かつ優れたインクジェット適性を有する低コストで製造可能なインクジェット用記録紙を提供することを課題として、シート状基材の少なくとも片面に無機顔料とバインダーを主体とした塗工層を設けた記録紙であり、表面近傍の塗工層の熱重量測定にて求めた無機分／有機分の比がいずれも９７／３〜７０／３０の範囲にあることを特徴とするインクジェット用記録紙を開示した。
Patent Document 1 discloses a cast coat paper excellent in water-based gravure printing aptitude as a gravure printing paper, in particular, excellent in ink drying property and ink coloring property.
Patent document 2 shows the appearance of coated paper for offset printing, and has an object to provide an ink jet recording paper having excellent ink jet aptitude and can be manufactured at low cost. It is a recording paper provided with a coating layer mainly composed of a pigment and a binder, and the ratio of inorganic content / organic content determined by thermogravimetry of the coating layer in the vicinity of the surface is 97/3 to 70/30. An inkjet recording paper characterized by being in the range is disclosed.
特許文献３は、低密度であり、剛度が高く、ひじわの抑制などの印刷適性に優れた印刷用塗工紙を提供することにある。また、操業性に優れ、優れた印刷適性などを有する印刷用塗工紙を効率よく製造することを課題として、原紙上に、顔料及び接着剤を含有する塗工層を有す印刷用塗工紙において、原紙中に、パルプの繊維間結合を阻害する有機化合物、あるいは無定型シリケートを含有し、乾燥後シューカレンダーで処理することを特徴とする印刷用塗工紙及び前記印刷用塗工紙の製造方法を開示した。 Patent Document 3 is to provide a coated paper for printing having a low density, high rigidity, and excellent printability such as suppression of wrinkles. In addition, for the purpose of efficiently producing a coated paper having excellent operability and excellent printability, a printing coating having a coating layer containing a pigment and an adhesive on the base paper. In the paper, the base paper contains an organic compound or an amorphous silicate that inhibits the interfiber bonding of the pulp, and is treated with a shoe calender after drying, and the above-mentioned coated paper for printing The manufacturing method of was disclosed.
特許文献４は原紙と塗工量が同レベルの従来の塗工紙に比べ、低密度でありながら、不透明度、白紙光沢度、印刷光沢度に優れ、剛度が改善され、印刷作業に適した印刷用塗工紙として原紙上に顔料及び接着剤を含有する塗工層を設けてなる印刷用塗工紙において、填料として軽質炭酸カルシウム粒子の表面をシリカで被覆した軽質炭酸カルシウム−シリカ複合物を含有した原紙上に、顔料粒子の粒径分布が体積基準で０．１〜１．０μｍの範囲に６０％以上含まれる顔料を有する塗工層を設けることを特徴とする印刷用塗工紙を開示した。 Patent Document 4 has a lower density than conventional coated paper with the same coating amount as that of the base paper, but has excellent opacity, white paper glossiness, and print glossiness, improved rigidity, and is suitable for printing work. A light calcium carbonate-silica composite in which the surface of light calcium carbonate particles is coated with silica as a filler in a printing coated paper in which a coating layer containing a pigment and an adhesive is provided on a base paper as a coated paper for printing A coated paper for printing, comprising a coating layer containing a pigment having a particle size distribution of pigment particles in a range of 0.1 to 1.0 μm on a volume basis in a range of 0.1 to 1.0 μm on a base paper containing Disclosed.
特許文献５は低密度、高剛直度で、高光沢、良好な白紙面質、印刷面質を持つ印刷用塗工紙を得ることを課題として、塗被組成物中に合成樹脂ラテックスを特定量以上含む塗層を基紙上に設け、乾燥後の表面光沢度を３０％以上とし、その乾燥直後の塗工面を特定硬度以上の弾性ロールを持つ熱ソフトカレンダーで処理した印刷用塗工紙を開示した。 Patent Document 5 has a problem of obtaining a coated paper for printing having low density, high rigidity, high gloss, good white paper surface quality, and printing surface quality, and a specific amount of synthetic resin latex in the coating composition. Disclosed is a coated paper for printing in which a coating layer including the above is provided on a base paper, the surface gloss after drying is 30% or more, and the coated surface immediately after drying is treated with a thermal soft calender having an elastic roll having a specific hardness or more. did.
さらに特許文献６は低密度で不透明度、剛度が良好であり、更に低白紙光沢にもかかわらず高い印刷光沢度を有する印刷用塗工紙として、原紙上に顔料及び接着剤を含有する塗工層を設けてなる印刷用塗工紙において、填料として軽質炭酸カルシウム−シリカ複合物を含有した原紙上に、顔料粒子の粒径分布が体積基準で０．４〜４．２μｍの範囲に６５％以上含まれる顔料を有する塗工層を設けることを特徴とする印刷用塗工紙を開示した。 Further, Patent Document 6 discloses a coating material containing a pigment and an adhesive on a base paper as a printing paper having a low density, good opacity and rigidity, and a high printing gloss despite a low white paper gloss. In a coated coated paper for printing having a layer, on a base paper containing a light calcium carbonate-silica composite as a filler, the particle size distribution of pigment particles is 65% in a range of 0.4 to 4.2 μm on a volume basis. Disclosed is a coated paper for printing, which is provided with a coating layer having the pigment contained above.
特許文献１のキャストコ−ト紙は塗工層の顔料、接着剤の配合を専ら検討したものであり、また特許文献２のインクジェット用記録紙は塗工層の熱重量測定にて求めた無機分／有機分の比を調整したものであって、いずれも十分なインク定着性やインク吸収性の水性グラビア印刷適性を有するものではなく、特に十分に満足できるレベルに印刷ムラを抑制するものではない。 The cast-coated paper of Patent Document 1 is an examination of the composition of pigments and adhesives in the coating layer, and the ink-jet recording paper of Patent Document 2 is an inorganic substance determined by thermogravimetric measurement of the coating layer. The ratio of water / organic content is adjusted, and none of them has sufficient ink fixability or ink-absorbing water-based gravure printing ability, and is particularly effective in suppressing printing unevenness to a sufficiently satisfactory level. Absent.
一方、特許文献３〜特許文献６はいずれも印刷用塗工紙の剛度を向上することを課題としている。しかし、近年、印刷打ち抜き機は高速化しており、ただ単に印刷用塗工紙の剛度を向上するだけでは高速化した印刷打ち抜き機を用いて円滑な生産を行い効率を向上することは困難になっている。この点に関し図４に印刷打ち抜き機によって製品の打ち抜きを行う態様を示して具体的に説明する。図４に示されるようにＡ方向に進行する製品１の所要の打ち抜き部分にピン２を刺して、製品１から取り除かれたニック（抜き粕）３がＢ方向に排出される。しかし、前述したように、ただ単に印刷用塗工紙の剛度を向上するという一方向の取り組みだけではこの図４に示す様な高速化した印刷打ち抜き機を用いる場合、加工時のニック（抜き粕）３の抜けが悪く、抜き粕３が異物として製品１に混入するという問題が生じる。したがってこの様な問題を解消するためには、加工時のニック（抜き粕）３の抜けが良好である性質、すなわち抜き適性やピン刺し適性という観点からの検討が必要となる。 On the other hand, Patent Documents 3 to 6 all have a problem of improving the rigidity of the coated paper for printing. However, in recent years, the speed of printing punching machines has increased, and it has become difficult to improve the efficiency by performing smooth production using a printing punching machine that has been speeded up simply by improving the stiffness of the coated paper for printing. ing. In this regard, FIG. 4 shows an embodiment in which a product is punched by a printing punch, which will be specifically described. As shown in FIG. 4, a pin 2 is pierced into a required punched portion of the product 1 traveling in the A direction, and the nick 3 removed from the product 1 is discharged in the B direction. However, as described above, if only a one-way effort to improve the rigidity of the coated paper for printing is used, when using a high-speed printing punching machine as shown in FIG. 3) The omission of 3 is bad, and there arises a problem that the extraction rod 3 is mixed into the product 1 as a foreign matter. Therefore, in order to solve such a problem, it is necessary to examine from the viewpoint of the property that the nick (punch) 3 is easily removed at the time of processing, that is, the suitability for punching and pinning.
また印刷用塗工紙を用いて紙器用原紙を作製する際には、製函前には所定のサイズと形状とに対応した罫入れと打ち抜きを行って、所定の形状の紙容器となす。したがって罫入れ適性（板紙に罫入れを行ったとき、所定の罫の形状、位置、深さが適性に板紙に入るかどうか）が印刷用塗工紙の重要な特性項目となる。また製函時には曲げが悪いと加工速度を上げることができないことや割れが生じたりするなど曲げ適性が印刷用塗工紙の重要な特性項目となる。
これに対し特許文献３〜特許文献６はいずれも印刷用塗工紙の剛度を向上することを課題とし、罫入れ適性や曲げ適性に関する検討は特には行われていない。特に印刷用塗工紙は嵩高紙であるため、原紙層に空隙が多く罫線を入れたときに空隙があるため、つぶれやすく、剛度を向上するという一方向の検討では良好な罫入れ適性を得ることはできない。
図３にこの様な従来の印刷用塗工紙を罫入れ部分で曲げた状態の断面写真を示す。図に示すように罫入れ部分で曲げた状態で層厚方向に均一に空隙は入らず、２カ所の大きな空隙が生じており、この部分に力が集中し、クラックが生じていることが分かる。
Further, when producing a paper container base paper using the coated paper for printing, a paper container of a predetermined shape is formed by performing ruled lines and punching corresponding to a predetermined size and shape before box making. Therefore, the suitability of the crease (whether or not the shape, position, and depth of the crease fit properly into the paperboard when the paperboard is creased) is an important characteristic item of the coated paper for printing. In addition, the bending ability is an important characteristic item of the coated paper for printing, for example, if the bending is poor at the time of box making, the processing speed cannot be increased or cracking occurs.
On the other hand, Patent Documents 3 to 6 all have a problem of improving the rigidity of the coated paper for printing, and no particular study has been made on ruled suitability and bend suitability. In particular, the coated paper for printing is a bulky paper, so there are many voids in the base paper layer, and there are voids when creased, so it is easy to collapse, and good crease aptitude is obtained in a one-way study to improve rigidity. It is not possible.
FIG. 3 shows a cross-sectional photograph of such a conventional printing coated paper bent at the ruled portion. As shown in the figure, it can be seen that there are two voids in the layer thickness direction even when bent at the crease, and there are two large voids. .
本発明は以上の従来技術における問題に鑑み、顔料インクを採用する水性グラビア印刷において印刷部分の印刷ムラが十分に抑制された水性グラビア印刷用塗工紙を提供することを目的とする。
The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a coated paper for aqueous gravure printing in which printing unevenness in a printed portion is sufficiently suppressed in aqueous gravure printing employing a pigment ink .
すなわち本発明の水性グラビア印刷用塗工紙は、原紙の少なくとも一方の面に顔料とバインダーを主成分とする塗工層を設けた水性グラビア印刷用塗工紙において、原紙が表裏層と中層とからなり、少なくとも表層の表面に塗工される塗工層中の顔料として無機顔料１００質量部に対して有機顔料を０．１〜１２．０質量部、バインダーを８．０〜２３．０質量部含有し、カオリンを含む無機顔料１００質量部中に２０〜４０質量部の軽質炭酸カルシウム、２０〜４０質量部の重質炭酸カルシウムを含み、緊度０．７５ｇ／ｃｍ ３ 以上であり、パルプの叩解度は表層が中層よりも低いフリーネス（ＣＳＦ）を有すると共に表層のパルプの叩解度はカナダ標準濾水度（ＣＳＦ）でフリーネスが３９０〜４７０ｍｌＣＳＦとされることを特徴とする。
That is, the water-based gravure printing coated paper of the present invention is a water-based gravure printing coated paper in which a coating layer mainly composed of a pigment and a binder is provided on at least one surface of the base paper . 0.1 to 12.0 parts by mass of an organic pigment and 8.0 to 23.0 parts by mass of a binder with respect to 100 parts by mass of an inorganic pigment as a pigment in a coating layer coated at least on the surface of the surface layer In an amount of 20 to 40 parts by weight of light calcium carbonate and 20 to 40 parts by weight of heavy calcium carbonate in 100 parts by weight of an inorganic pigment containing kaolin and having an intensity of 0.75 g / cm 3 or more, pulp The beating degree of the surface layer has a lower freeness (CSF) than the middle layer, and the beating degree of the surface pulp is a Canadian standard freeness (CSF), and the freeness is 390 to 470 ml CSF. The
さらに選択的に中層のフリーネスを４３０〜５３０ｍｌＣＳＦとし、また表層への嵩向上剤の添加量を０．３〜１．３重量％、中層への嵩向上剤の添加量を０．７〜１．７重量％とすることができる。また中層に針葉樹パルプ（ＮＢＫＰ）を５．０〜１５．０重量％配合してもよい。
Further, the freeness of the middle layer is selectively set to 430 to 530 ml CSF, the addition amount of the bulk improver to the surface layer is 0.3 to 1.3% by weight, and the addition amount of the bulk improver to the middle layer is 0.7 to 1. It can be 7% by weight. Moreover, you may mix | blend conifer pulp (NBKP) with 5.0 to 15.0 weight% in a middle layer.
加えて全層のＮパルプ配合量が１．０〜１０．０質量部とされ、中層に針葉樹パルプ（ＮＢＫＰ）が５．０〜１５．０重量％配合されるように制御することができる。 In addition, the amount of N pulp in all layers is 1.0 to 10.0 parts by mass, and it can be controlled so that 5.0 to 15.0% by weight of softwood pulp (NBKP) is blended in the middle layer.
水性グラビア印刷用塗工紙の製造加工工程における加熱時の引裂強度と、製函後における使用時における引裂強度に対する仕様を区別するという観点から、使用時における引裂強度が充分である範囲で、製造加工工程における加熱時の引裂強度を低くすることで製品としての使用時における必要な剛度を備えると同時に製造加工工程における加熱時の引裂強度を最適化して抜き適性やピン刺し適性を向上するために１０５℃、３０秒加熱した時の引裂強度が１５００ｍＮ以下であり、常温引裂強度が１０００ｍＮ以上であるようにしてもよい。
表裏層と中層との層間強度を２００〜５００ｍＮ／ｃｍに調整するのがよい。
これによって水性グラビア印刷用塗工紙の用途としては不足のない剛度を備えかつ高速打ち抜き時における製品と抜き粕の円滑な分離が可能で高効率な生産を行うことが可能となる。
また罫入れ適性及び曲げ適性を向上することが可能となる。
Manufactured within the range where the tear strength during use is sufficient from the viewpoint of distinguishing between the tear strength during heating in the manufacturing process of coated paper for aqueous gravure printing and the specifications for tear strength during use after box making To lower the tear strength during heating in the processing process to provide the necessary rigidity when used as a product, and at the same time optimize the tear strength during heating in the manufacturing process to improve punchability and pin piercing The tear strength when heated at 105 ° C. for 30 seconds may be 1500 mN or less, and the room temperature tear strength may be 1000 mN or more.
The interlayer strength between the front and back layers and the middle layer is preferably adjusted to 200 to 500 mN / cm.
As a result, the water-based gravure-printed coated paper has a rigidity that is not inadequate, and can smoothly separate the product and the punched bar at the time of high-speed punching, thereby enabling highly efficient production.
Further, it is possible to improve ruled suitability and bending suitability.
本発明により、水性グラビア印刷において良好なインク定着性とインク吸収性を有する水性グラビア印刷用塗工紙を得ることができる。特に、水性グラビア印刷における印刷ムラが抑えられた水性グラビア印刷用塗工紙を得ることができる。
According to the present invention, it is possible to obtain a coated paper for aqueous gravure printing having good ink fixing properties and ink absorbability in aqueous gravure printing . In particular, a coated paper for aqueous gravure printing in which uneven printing in aqueous gravure printing is suppressed can be obtained.
以下、本発明の水性グラビア印刷用塗工紙について詳細に説明する。
本発明の水性グラビア印刷用塗工紙は、原紙上に顔料およびバインダーを主成分とする塗工層を有する。塗工層を設けることによって、印刷品質および外観の点で未塗工紙と差別化することができる。
Hereinafter, the aqueous gravure coated coated paper of the present invention will be described in detail.
The aqueous gravure printing coated paper of the present invention has a coated layer mainly composed of a pigment and a binder on the base paper. By providing a coated layer, it is possible to differentiate it from uncoated paper in terms of printing quality and appearance.
本発明における塗工層はバインダーとしてラテックスバインダーを主に含有することが好ましい。水分散性バインダーであるラテックスバインダーは、塗工層に用いると塗層強度の発現に優れる。塗工層におけるバインダーの総含有量は、塗工層の強度、インク吸収性の観点から、塗工層中の顔料の総和１００質量部に対して８．０〜２３．０質量部含有させる。バインダーによって無機材料を囲んだ態様の構造を有する塗工層が得られる。これによって無機材料間の空隙構造が確定し、固定化される。その結果塗工層に伸びを与え、塗工層のクラックを防止して強度が向上し、水性グラビア印刷適性も得られる。
バインダーの総含有量が８．０質量部未満では塗工層の強度が不足する。２３．０質量部を超えると光沢が過度に低下する。
さらに好ましくは塗工層中の顔料の総和１００質量部に対して１２．８〜１８．５±５質量部含有させるのが良く、最も好ましくは１３．０〜１９．０質量部、特にコスト的な観点からは１６．０質量部含有させるのが良い。
It is preferable that the coating layer in the present invention mainly contains a latex binder as a binder. A latex binder which is a water-dispersible binder is excellent in the expression of coating layer strength when used in a coating layer. The total binder content in the coating layer is 8.0 to 23.0 parts by mass with respect to 100 parts by mass of the total pigment in the coating layer, from the viewpoint of the strength of the coating layer and the ink absorbability. A coating layer having a structure in which an inorganic material is surrounded by a binder is obtained. As a result, the void structure between the inorganic materials is determined and fixed. As a result, the coating layer is stretched, cracks of the coating layer are prevented, the strength is improved, and water gravure printing suitability is also obtained.
If the total content of the binder is less than 8.0 parts by mass, the strength of the coating layer is insufficient. When it exceeds 23.0 parts by mass, the gloss is excessively lowered.
More preferably, 12.8 to 18.5 ± 5 parts by mass is added to 100 parts by mass of the total pigment in the coating layer, most preferably 13.0 to 19.0 parts by mass, particularly cost. From such a viewpoint, it is preferable to contain 16.0 parts by mass.
本発明において、塗工層は顔料として無機顔料１００質量部に対して有機顔料を０．１〜１２．０質量部含有する。
この有機顔料としてはポリスチレン系プラスチックピグメント、ポリアクリル系プラスチックピグメント、スチレン−アクリル系プラスチックピグメント、スチレン−ブタジエン系プラスチックピグメント、ポリエチレン、マイクロカプセル、尿素樹脂、メラミン樹脂などが挙げられる。有機顔料を含有させることで塗工板紙の光沢・白色度を向上させる。印刷適性、後加工適性（ニス引き、糊付け、ブリスターパック適性）の向上に効果がある。
前項のバインダーによって低下した光沢は、有機顔料を含有することで補うことができる。有機顔料含有量が０．１質量部未満では有機顔料添加による塗工層の光沢向上が充分ではなく、１２．０質量部を超えて含有させる場合には過剰な有機顔料によって、コストに見合う特性の向上は認められない。さらに好ましくは有機顔料を２．０〜７．０質量部含有するのが良く、コスト的な観点からは２．０質量部含有するのが最善である。
In this invention, a coating layer contains 0.1-12.0 mass parts of organic pigments with respect to 100 mass parts of inorganic pigments as a pigment.
Examples of the organic pigment include polystyrene plastic pigment, polyacrylic plastic pigment, styrene-acrylic plastic pigment, styrene-butadiene plastic pigment, polyethylene, microcapsule, urea resin, and melamine resin. Inclusion of organic pigments improves the gloss and whiteness of coated paperboard. Effective in improving printability and post-processing properties (varnishing, gluing, blister packability).
The gloss reduced by the binder described in the previous section can be compensated by containing an organic pigment. When the organic pigment content is less than 0.1 parts by mass, the gloss of the coating layer is not sufficiently improved by addition of the organic pigment, and when the content exceeds 12.0 parts by mass, the characteristics are commensurate with the cost due to the excess organic pigment. The improvement is not recognized. More preferably, the organic pigment is contained in an amount of 2.0 to 7.0 parts by mass, and it is best to contain 2.0 parts by mass from the viewpoint of cost.
本発明の水性グラビア印刷用塗工紙は、片面塗工では緊度０．７５ｇ／ｃｍ ３ 以上である。一般に軽量化することによってコストダウンを図り、輸送・持ち運びの効率を向上することができる。その観点から緊度は低い方が好ましい。反面、嵩向上剤を用い、過度に軽量化した場合には、塗工層の平滑度が低下し、印刷適性が悪化する。本発明の水性グラビア印刷用塗工紙は、片面塗工では緊度０．７５ｇ／ｃｍ ３ 以上とすることができる。緊度０．７５ｇ／ｃｍ ３ 以上であれば印刷適性の悪化はない。
The coated paper for aqueous gravure printing of the present invention has a strength of 0.75 g / cm 3 or more in single-sided coating. Generally, the weight can be reduced to reduce the cost and improve the efficiency of transportation and carrying. From this point of view, it is preferable that the tension is low. On the other hand, when a bulk improver is used and the weight is excessively reduced, the smoothness of the coating layer is lowered and printability is deteriorated. The coated paper for water-based gravure printing of the present invention can have a tension of 0.75 g / cm 3 or more in single-sided coating. If the tension is 0.75 g / cm 3 or more, the printability is not deteriorated.
本発明における塗工層は２０〜４０質量部の軽質炭酸カルシウムを含む。軽質炭酸カルシウムが２０質量部未満の場合には、水性グラビアインクの定着性や吸収性が悪く、印刷ムラや印刷滲み（吸収されなかったインクが塗工紙面上を流れるインク泳ぎ）が発生する。
４０質量部を超える場合にはコストに見合う特性の向上は認められない。軽質炭酸カルシウムは３０質量部程度含有するのが良い。
The coating layer in this invention contains 20-40 mass parts light calcium carbonate. When the light calcium carbonate is less than 20 parts by mass, the fixability and absorbability of the aqueous gravure ink are poor, and printing unevenness and printing bleeding (ink swimming in which unabsorbed ink flows on the coated paper surface) occur.
When it exceeds 40 parts by mass, no improvement in characteristics commensurate with cost is recognized. About 30 parts by weight of light calcium carbonate is preferably contained.
本発明における塗工層はさらに２０〜４０質量部の重質炭酸カルシウムと３０〜５０質量部のカオリンによって総顔料１００質量部を得る。
塗工層が２０〜４０質量部の重質炭酸カルシウムと、２０〜４０質量部の軽質炭酸カルシウムとを含有することによって、炭酸カルシウムの粒子間に形成される空隙によって、水性グラビアインクを吸収することができ、水性グラビア印刷適性を有することができる。塗工層中の炭酸カルシウムが重質炭酸カルシウムのみ含有の場合には塗工層の空隙の形成が不十分となり、水性グラビア印刷適性が得られない。
重質炭酸カルシウムは３０質量部程度含有するのが良い。
The coating layer in the present invention further obtains 100 parts by mass of the total pigment by 20 to 40 parts by mass of heavy calcium carbonate and 30 to 50 parts by mass of kaolin.
When the coating layer contains 20 to 40 parts by weight of heavy calcium carbonate and 20 to 40 parts by weight of light calcium carbonate, the aqueous gravure ink is absorbed by voids formed between the calcium carbonate particles. And can have aqueous gravure printability. When the calcium carbonate in the coating layer contains only heavy calcium carbonate, the formation of voids in the coating layer becomes insufficient, and water gravure printing suitability cannot be obtained.
About 30 parts by mass of heavy calcium carbonate is preferably contained.
また３０〜５０質量部のカオリンによって光沢感を調整することができる。カオリン３０質量部未満では光沢感が不足し、５０質量部を超えて含有させる場合には相対的に炭酸カルシウムの含有量が低下し、塗工層の空隙の形成が不十分となり、水性グラビア印刷適性が得られない。カオリンは４０質量部程度含有するのが良い。 Moreover, glossiness can be adjusted with 30-50 mass parts kaolin. When it is less than 30 parts by weight of kaolin, the glossiness is insufficient, and when it is contained in excess of 50 parts by weight, the content of calcium carbonate is relatively lowered, and the formation of voids in the coating layer becomes insufficient, and aqueous gravure printing. Aptitude is not obtained. Kaolin should be contained in an amount of about 40 parts by mass.
本発明の水性グラビア印刷用塗工紙に用いられる原紙としては、広葉樹パルプ（ＬＢＫＰ）及び針葉樹パルプ（ＮＢＫＰ）などの化学パルプを用いる。その原紙の特性を検討し、製品としての使用時における必要な剛度を備え、高速印刷打ち抜き適性、すなわち抜き適性やピン刺し適性が向上した水性グラビア印刷用塗工紙を提供することができた。
As the base paper used for the coated paper for aqueous gravure printing of the present invention, chemical pulp such as hardwood pulp (LBKP) and softwood pulp (NBKP) is used. By examining the characteristics of the base paper, it was possible to provide a coated paper for aqueous gravure printing that had the necessary rigidity for use as a product and improved high-speed printing punchability, ie, improved punchability and pin piercing.
全層のＮパルプ配合量を１．０〜１０．０質量部とすることによって、印刷の表面性、再現性、印刷ムラ等の印刷適性を保ち、製品としての使用時における必要な剛度を備えることができる。
中層のＮパルプ配合量を５．０〜１５．０質量部にすることによって紙の引裂強度のバランスが図られ、製品としての使用時における必要な印刷適性を備え、かつ抜き適性やピン刺し適性を向上することができる。また中層の繊維の密度を低くし、同量の繊維でより厚みを出し、軽量化によるコストダウンが輸送・持ち運びの効率を向上する。
By setting the N pulp blending amount in all layers to 1.0 to 10.0 parts by mass, the printing surface properties, reproducibility, printing suitability such as printing unevenness, etc. are maintained, and the necessary rigidity at the time of use as a product is provided. be able to.
The balance of tear strength of paper is achieved by setting the N pulp blending amount in the middle layer to 5.0 to 15.0 parts by mass, and it has the necessary printability when used as a product, and is also suitable for punching and pin piercing. Can be improved. In addition, the density of the middle-layer fibers is lowered, the same amount of fibers is used to increase the thickness, and the cost reduction by weight reduction improves the efficiency of transportation and carrying.
中層のＮパルプ配合量が５．０質量部未満では、充分な引裂強度が確保できなく、一方１５質量部以上では、Ｎパルプ配合量が過剰となり、製造加工工程における加熱時の引裂強度が過剰となり、抜き適性やピン刺し適性が悪化する。さらに好ましくは中層に繊維の粗い針葉樹パルプ（ＮＢＫＰ）を１０．０重量％配合する。 If the N-layer blending amount of the middle layer is less than 5.0 parts by mass, sufficient tear strength cannot be ensured. On the other hand, if it is 15 parts by mass or more, the N-pulp blending amount becomes excessive and the tearing strength during heating in the manufacturing process is excessive. As a result, the suitability for pinning and pin insertion deteriorates. More preferably, 10.0% by weight of soft fiber pulp (NBKP) having a coarse fiber is blended in the middle layer.
以上の本発明の水性グラビア印刷用塗工紙は、原紙が表裏層と中層とからなり、１０５℃、３０秒加熱した時の引裂強度が１５００ｍＮ以下であり、常温引裂強度が１０００ｍＮ以上であるという特徴を備える。かかる特徴によって、特殊用途を除く、例えば小箱パッケージなどの一般的な水性グラビア印刷用塗工紙の用途としては不足のない強度とされている。
The coated paper for aqueous gravure printing of the present invention is composed of a front and back layer and an intermediate layer, and has a tear strength of 1500 mN or less when heated at 105 ° C. for 30 seconds, and a normal temperature tear strength of 1000 mN or more. It has features. Due to such characteristics, the strength is not insufficient for a general water-based gravure printing coated paper such as a small box package excluding special uses.
また本発明の水性グラビア印刷用塗工紙は、片面塗工では緊度０．７５ｇ／ｃｍ ３ 以上である。一般に軽量化することによってコストダウンを図り、輸送・持ち運びの効率を向上することができる。その観点から緊度は低い方が好ましい。反面、嵩向上剤を用い、過度に軽量化した場合には、塗工層の平滑度が低下し、印刷適性が悪化する。本発明の水性グラビア印刷用塗工紙は、片面塗工では緊度０．７５ｇ／ｃｍ ３ 以上とすることができる。緊度０．７５ｇ／ｃｍ ３ 以上であれば印刷適性の悪化はない。
The coated paper for water-based gravure printing of the present invention has a strength of 0.75 g / cm 3 or more in single-sided coating. Generally, the weight can be reduced to reduce the cost and improve the efficiency of transportation and carrying. From this viewpoint, it is preferable that the tension is low. On the other hand, when a bulk improver is used and the weight is excessively reduced, the smoothness of the coating layer is lowered and printability is deteriorated. The coated paper for water-based gravure printing of the present invention can have a tension of 0.75 g / cm 3 or more in single-sided coating. If the tension is 0.75 g / cm 3 or more, the printability is not deteriorated.
さらに本発明の水性グラビア印刷用塗工紙では、表裏層と中層との層間強度が２００〜５００ｍＮ／ｃｍに調整されるのが好ましい。これによって製品としての使用時における必要な引裂強度を備え、かつ抜き適性やピン刺し適性を向上し、しかも罫入れ適性及び曲げ適性を向上することができる。
層間強度が２００ｍＮ／ｃｍ未満ではオフセット印刷時に表裏層と中層との層間剥離が生じる。層間強度が５００ｍＮ／ｃｍを超えると抜き適性、ピン刺し適性、罫入れ適性及び曲げ適性が悪化する。
Furthermore, in the aqueous gravure coated coated paper of the present invention, the interlayer strength between the front and back layers and the middle layer is preferably adjusted to 200 to 500 mN / cm. As a result, the tear strength required for use as a product can be provided, the punching ability and pinning ability can be improved, and the creaseability and bending ability can be improved.
When the interlayer strength is less than 200 mN / cm, delamination between the front and back layers and the middle layer occurs during offset printing. When the interlaminar strength exceeds 500 mN / cm, the punching ability, pin piercing ability, creaseability and bending ability deteriorate.
さらに表層が中層よりも低いフリーネスを有する様にすることができる。
その場合、表層のフリーネスを３９０〜４７０ｍｌ、中層のフリーネスを４３０〜５３０ｍｌとする。表裏層に叩解を進めた細かい繊維を配合し、引裂強度が高くなるのを抑え、原紙の塗工面側の表層部を緻密な構造とすることで印刷適性の向上にも繋がる。一方中層は表裏層より叩解を粗くすることで適度な引裂強度を備え、抜き適性やピン刺し適性の最適化が可能となる。
表層のフリーネスが３９０ｍｌ未満では引裂強度が低下する。
表層のフリーネスが４７０ｍｌを超えると緻密な表層を得ることができなく、印刷適性も低下する。
表層のフリーネスはさらに好ましくは４２０〜４３５ｍｌ、最も好ましくは４３０ｍｌとする。
これに応じて中層のフリーネスをさらに好ましくは４８０〜５００ｍｌ、最も好ましくは４８０ｍｌとする。
Further, the surface layer can have a lower freeness than the middle layer.
In this case, the freeness of the surface layer is set to 390 to 470 ml, and the freeness of the middle layer is set to 430 to 530 ml. By blending fine fibers that have been beaten in the front and back layers, the increase in tear strength is suppressed, and the surface layer portion on the coated surface side of the base paper has a dense structure, which leads to improved printability. On the other hand, the middle layer has moderate tear strength by roughening the beating than the front and back layers, and it is possible to optimize the punchability and pin piercing ability.
If the freeness of the surface layer is less than 390 ml, the tear strength decreases.
If the freeness of the surface layer exceeds 470 ml, a dense surface layer cannot be obtained, and the printability also deteriorates.
The freeness of the surface layer is more preferably 420 to 435 ml, most preferably 430 ml.
Accordingly, the freeness of the middle layer is more preferably 480 to 500 ml, and most preferably 480 ml.
また表層への嵩向上剤の添加量を０．３〜１．３質量部、中層への嵩向上剤の添加量を０．７〜１．７質量部とする。これによって、中層よりも表裏層を空隙の少ない緻密な層とする。また中層への嵩向上剤の添加量を相対的に多くして中層の密度を低くし、同量の繊維でより厚みを出し、軽量化によるコストダウンが輸送・持ち運びの効率を向上する。表層への嵩向上剤の添加量が０．３質量部未満では嵩高効果が不十分となる。一方、表層への嵩向上剤の添加量が１．３質量部を超えると緻密な表層を得ることができない。さらに好ましくは表層への嵩向上剤の添加量を０．２〜０．８重量％、最も好ましくは０．８重量％とする。
中層への嵩向上剤の添加量が０．７重量％未満では嵩高が不十分となる。中層への嵩向上剤の添加量が１．７重量％を超えると強度低下を生じる。さらに好ましくは中層への嵩向上剤の添加量を１．２重量％程度とする。
Moreover, the addition amount of the bulk improvement agent to a surface layer shall be 0.3-1.3 mass part, and the addition amount of the bulk improvement agent to a middle layer shall be 0.7-1.7 mass part. As a result, the front and back layers are dense layers with less voids than the middle layer. In addition, the amount of bulk improver added to the middle layer is relatively increased to lower the density of the middle layer, the same amount of fiber is used to increase the thickness, and the cost reduction due to weight reduction improves the efficiency of transportation and carrying. If the amount of the bulk improver added to the surface layer is less than 0.3 parts by mass, the bulkiness effect will be insufficient. On the other hand, when the amount of the bulk improver added to the surface layer exceeds 1.3 parts by mass, a dense surface layer cannot be obtained. More preferably, the addition amount of the bulk improver to the surface layer is 0.2 to 0.8% by weight, and most preferably 0.8% by weight.
If the amount of the bulk improver added to the middle layer is less than 0.7% by weight, the bulkiness is insufficient. When the amount of the bulk improver added to the middle layer exceeds 1.7% by weight, the strength is lowered. More preferably, the amount of the bulk improver added to the middle layer is about 1.2% by weight.
以上のようにして得られる本発明の水性グラビア印刷用塗工紙で用いられる原紙の印刷表面、断面写真及びその模式図を、従来の原紙の断面写真及びその模式図と比較して図１に示す。
図１に示すように従来の原紙ではその断面写真及び断面模式図に示されるように全体として空隙が多い。その結果として表面性状を階調８０％（一定の面積の８０％にインキが乗っている）で観察すると吸収されなかったインクが塗工紙面上を流れるインク泳ぎが発生していることが表面写真に示されている。
これに対して本発明の水性グラビア印刷用塗工紙で用いられる原紙では、その断面写真及び断面模式図に示されるように、表面と空隙が多い層との間に緻密な層が有り、ただ単に全体として空隙が多い従来の原紙とは異なる。その結果として表面性状を階調８０％で観察するとインク泳ぎは発生しない。
The printing surface, cross-sectional photograph and schematic diagram of the base paper used in the aqueous gravure printing coated paper of the present invention obtained as described above are compared with the cross-sectional photograph and schematic diagram of the conventional base paper in FIG. Show.
As shown in FIG. 1, the conventional base paper has a large number of voids as a whole as shown in a cross-sectional photograph and a schematic cross-sectional view thereof. As a result, when the surface texture is observed with a gradation of 80% (80% of a certain area has ink on it), ink that has not been absorbed and ink swims on the coated paper surface. Is shown in
On the other hand, the base paper used in the water-based gravure printing coated paper of the present invention has a dense layer between the surface and the layer with many voids, as shown in the cross-sectional photograph and the schematic cross-sectional view. It is different from the conventional base paper which has many voids as a whole. As a result, when the surface texture is observed at a gradation of 80%, ink swimming does not occur.
以下、本発明を実施例によりさらに具体的に説明する。また、実施例において示す「質量部」は、乾燥固形分あるいは実質成分の質量部および質量部を示す。また、塗工量も乾燥固形分の塗工量を示す。 Hereinafter, the present invention will be described more specifically with reference to examples. In addition, “parts by mass” shown in the examples indicates a dry solid content or a mass part and a mass part of a substantial component. The coating amount also indicates the coating amount of the dry solid content.
（１）原紙の製作
本発明に用いられる原紙は、木材パルプを主原料とする。広葉樹晒クラフトパルプ、針葉樹晒クラフトパルプ等の化学パルプ、サーモメカニカルパルプ（ＴＭＰ）等の機械パルプや古紙パルプを任意に組合せて、または単独で用いられる。紙料は、嵩向上剤、澱粉、カチオン澱粉、ポリアクリルアマイド等の紙力増強剤、ロジンサイズ、アルキルケテンダイマー、合成サイズ等のサイズ剤、タルク、炭酸カルシウム、チタン等の填料、コロイダルシリカ、ポリアクリルアマイド、ポリエチレンオキサイド等の歩留向上剤、濾水剤等の抄紙薬品が含まれる。
表裏層、中層の各層毎に原料の配合を調整したパルプスラリーを指定のフリーネスに調整する。内添抄紙薬品として、指定の添加量の嵩向上剤、または嵩高填料、カチオン化タピオカ澱粉を添加し、抄造する。
サイズプレス装置で両面あたり澱粉を塗布し、カレンダー処理を行い、坪量２１５〜２３５ｇ／ｍ２の原紙１を製作した。原紙の構造を表１に示す。
(1) Production of base paper The base paper used in the present invention uses wood pulp as a main raw material. Chemical pulps such as hardwood bleached kraft pulp and softwood bleached kraft pulp, mechanical pulp such as thermomechanical pulp (TMP) and used paper pulp are arbitrarily combined or used alone. Paper materials are bulk improvers, starch, cationic starch, paper strength enhancers such as polyacrylamide, rosin size, alkyl ketene dimer, synthetic size and other sizing agents, talc, calcium carbonate, titanium and other fillers, colloidal silica, Examples include yield improvers such as polyacrylamide and polyethylene oxide, and papermaking chemicals such as freezing agents.
The pulp slurry in which the blending of raw materials is adjusted for each of the front and back layers and the middle layer is adjusted to a specified freeness. As the internally added paper chemicals, a specified amount of bulk improver or bulk filler and cationized tapioca starch are added to make paper.
Starch was applied on both sides with a size press machine, calendering was performed, and a base paper 1 having a basis weight of 215 to 235 g / m 2 was produced. Table 1 shows the structure of the base paper.
本発明に用いられる塗料は、軽質炭酸カルシウム、重質炭酸カルシウム、カオリンを組合せた無機顔料、有機顔料、ラテックスなどで構成され、その他に澱粉、カルボキシメチルセルロース（ＣＭＣ）、潤滑剤、消泡剤、分散剤、保水剤、ｐＨ調整剤、蛍光染料、染料、防腐剤等を含む。
また選択的に無機顔料１００質量部に対してバインダーを８．０〜２３．０質量部含有させ、またカオリンを含む無機顔料１００質量部中に２０〜４０質量部の軽質炭酸カルシウムを含み、さらにはカオリンを含む無機顔料１００質量部中に２０〜４０質量部の重質炭酸カルシウムを含むようにすることができる。
塗工層の塗工液における無機顔料、有機顔料、バインダーの配合部数は表２に記載したものとして調整した。顔料は重質炭酸カルシウム（ファイマテック社製）、軽質炭酸カルシウム（矢橋工業社製）、カオリン（カダム社、白石カルシウム社製）とし、バインダーとしてラテックス（ＪＳＲ社製）を使用した。有機顔料としては（日本ゼオン社製）を使用した。
Further, 8.0 to 23.0 parts by mass of a binder is selectively added to 100 parts by mass of the inorganic pigment, and 20 to 40 parts by mass of light calcium carbonate is contained in 100 parts by mass of the inorganic pigment containing kaolin. Can contain 20-40 parts by weight of heavy calcium carbonate in 100 parts by weight of the inorganic pigment containing kaolin.
The number of blended inorganic pigments, organic pigments, and binders in the coating layer coating liquid was adjusted as described in Table 2. The pigments were heavy calcium carbonate (manufactured by Phimatech), light calcium carbonate (manufactured by Yabashi Kogyo Co., Ltd.), kaolin (made by Kadam Co., Ltd., Shiraishi Calcium Co., Ltd.), and latex (manufactured by JSR Corp.) as the binder. As an organic pigment, Nippon Zeon Co., Ltd. was used.
（３）水性グラビア印刷用塗工紙の製作及び評価 以上の原紙及び塗工液を用い、実施例１〜４および比較例１〜４の水性グラビア印刷用塗工紙を以下の手順により製作した。
Ａ〜Ｆの原紙の表面に、湿式重質炭酸カルシウムとカオリンを配合した下塗りの塗工量を１０．５ｇ／ｍ２塗工した上にａ〜ｇのいずれかの塗工液の塗工量を１１．５ｇ／ｍ２として片面塗工し、乾燥させた後、カレンダー処理をして水性グラビア印刷用塗工紙を製作した。
(3) Production and Evaluation of Coated Paper for Aqueous Gravure Printing Using the above base paper and coating liquid, the aqueous gravure coated papers of Examples 1 to 4 and Comparative Examples 1 to 4 were produced according to the following procedure. .
On the surface of the A to F base paper, 10.5 g / m 2 of the coating amount of the undercoat containing wet heavy calcium carbonate and kaolin is applied, and then the coating amount of any of the coating liquids a to g Was coated at 11.5 g / m 2 , dried, and then calendered to produce water-based gravure-coated paper .
実施例１および比較例１〜２の水性グラビア印刷用塗工紙に対して１０５℃、３０秒加熱した時の加熱引裂強度と常温下における常温引裂強度とを測定した。加熱引裂強度の測定結果が１５００ｍＮ以下であれば加熱引裂強度が良好であり高速印刷打ち抜き機を用いる際の加工時の抜き適性やピン刺し適性が良好であると評価できる。また常温引裂強度の測定結果が１０００ｍＮ以上であれば常温引裂強度が良好であり、特殊用途を除く、例えばタバコパッケージなどの一般的な水性グラビア印刷用塗工紙の用途としては不足のない剛度であると評価できる。
その測定結果を表３に示す。
The heat tear strength when heated for 30 seconds at 105 ° C. and the room temperature tear strength at room temperature were measured for the aqueous gravure printing coated papers of Example 1 and Comparative Examples 1-2. If the measurement result of the heat tear strength is 1500 mN or less, it can be evaluated that the heat tear strength is good and the punchability at the time of processing and the pin piercing suitability when using a high-speed printing punching machine are good. Moreover, if the measurement result of the normal temperature tear strength is 1000 mN or more, the normal temperature tear strength is good, and the rigidity is not insufficient as a general water-based gravure printing coated paper such as a cigarette package except for special applications. It can be evaluated that there is.
The measurement results are shown in Table 3.
表３より、実施例１で示される水性グラビア印刷用塗工紙は、加熱引裂強度の測定結果が１５００ｍＮ以下に抑制されており、加熱引裂強度が良好であり高速印刷打ち抜き機使用時における抜き適性が改善されていることがわかる。また実施例１で示される水性グラビア印刷用塗工紙は、常温引裂強度の測定結果がいずれも１０００ｍＮを超えており、一般的な水性グラビア印刷用塗工紙の用途としては不足のない剛度であることがわかる。これに対し本発明の条件を満足しない比較例１〜２では加熱引裂強度の測定結果が１５００ｍＮを超え、高速印刷打ち抜き機使用時における抜き適性の改善がみられない。
From Table 3, as for the water-based gravure printing coated paper shown in Example 1, the measurement result of the heat tear strength is suppressed to 1500 mN or less, the heat tear strength is good, and the punchability when using a high-speed printing punching machine. It can be seen that is improved. The aqueous gravure printing coated paper shown in Example 1, and measurement results of the normal temperature tear strength exceeds the both 1 0 00MN, no shortage as application of a general aqueous gravure coated printing paper It turns out that it is rigidity. On the other hand, in Comparative Examples 1 and 2 that do not satisfy the conditions of the present invention, the measurement result of the heat tear strength exceeds 1500 mN, and the improvement of the punchability when using the high-speed printing punching machine is not seen.
さらに実施例１〜４および比較例１の水性グラビア印刷用塗工紙に対して常温下における表裏層と中層との層間強度を測定した。その測定結果が２００〜５００ｍＮ／ｃｍの範囲にあれば表裏層と中層との層間強度が最適化され、特殊用途を除く、一般的な水性グラビア印刷用塗工紙の用途としては不足のない層間強度を備えてオフセット印刷時に表裏層と中層との層間剥離が生じる様なことはなく、かつ良好な抜き適性やピン刺し適性を有し、また良好な罫入れ適性及び曲げ適性を有すると評価した。その測定結果を表４に示す。なお表４において「表層−中層間」は本実施例及び比較例の５層の水性グラビア印刷用塗工紙における表層−中層間の層間強度、「中層−中層間」は中層−中層間の層間強度を示す。
Furthermore, the interlayer strength between the front and back layers and the middle layer at room temperature was measured for the aqueous gravure printing coated papers of Examples 1 to 4 and Comparative Example 1. If the measurement result is in the range of 200 to 500 mN / cm, the interlayer strength between the front and back layers and the middle layer is optimized, and there is no shortage of layers as a general water-based gravure printing coated paper application except for special applications. It was evaluated that it had strength and did not cause delamination between the front and back layers and the middle layer during offset printing, had good punchability and pin piercing ability, and had good creaseability and bendability. . The measurement results are shown in Table 4. In Table 4, “surface layer-intermediate layer” is the interlayer strength between the surface layer and the intermediate layer in the five-layer waterborne gravure printing coated paper of this Example and Comparative Example, and “intermediate layer-intermediate layer” is the interlayer between the intermediate layer and the intermediate layer. Indicates strength.
図２に実施例の水性グラビア印刷用塗工紙を罫入れ部分で曲げた状態の断面写真を示す。図に示すように罫入れ部分で曲げた状態で層厚方向に図３に示す従来のものに比べ、多数の空隙がバランス良く形成されており、２カ所の大きな空隙が生じる図３に示す従来のものに比べ、この部分で強度が極端に低下することはなく、潰れやすさを解消していることが分かる。
FIG. 2 shows a cross-sectional photograph of the water-based gravure printing coated paper of the example bent at the ruled portion. As shown in the figure, a large number of voids are formed in a well-balanced manner in the layer thickness direction in a state bent at the crease portion, and two large voids are generated in the conventional case shown in FIG. It can be seen that the strength does not extremely decrease in this part as compared with the above, and the ease of crushing is eliminated.
実施例１〜４および比較例１〜４の水性グラビア印刷用塗工紙に対してオフセット印刷適性、インク吸収性、インク定着性、印刷ムラ及び相対単位価格について下記の方法により評価した。
その結果を表５に示す。
The offset printing suitability, ink absorptivity, ink fixability, printing unevenness and relative unit price of the aqueous gravure printing coated papers of Examples 1 to 4 and Comparative Examples 1 to 4 were evaluated by the following methods.
The results are shown in Table 5.
なおオフセット印刷適性の評価以外は水性グラビア印刷機を用い、水性グラビア印刷機としてクラボウ社製印刷機ＧＰ−１０を用いた。また、インクはＤＩＣ株式会社製ディックセーフＷＨ（水性）を用いた。印刷速度は３０ｍ／分に設定し、行った。 Except for the evaluation of the offset printing suitability, a water-based gravure printer was used, and a printer GP-10 manufactured by Kurabo Industries was used as the water-based gravure printer. The ink used was Dick Safe WH (aqueous) manufactured by DIC Corporation. The printing speed was set at 30 m / min.
（ｉ）オフセット印刷適性マンローランド社製オフセット印刷機Ｒ２００印刷速度：５，０００枚／分、使用インク：ＤＩＣ株式会社製フュージョンＧの印刷を行い、印刷後印刷サンプルの状態について目視評価で判定した。実用上に問題はない。 (I) Offset printing suitability An offset printing machine R200 manufactured by Man Roland, Inc. Printing speed: 5,000 sheets / minute, ink used: Fusion G manufactured by DIC Corporation was printed, and the state of the printed sample after printing was determined by visual evaluation. . There is no problem in practical use.
（ｉｉ）グラビア印刷再現性クラボウ社製印刷機ＧＰ−１０印刷速度：３０ｍ／分、使用インク：ＤＩＣ株式会社製ディックセーフＷＨ（水性）１０％間隔の階調とグラデーション版を用い、網点が３０％以下のハイライト部やグラデーションの再現とミスドットの状態を目視評価で判定した。
５：色のミスドットがない。
４：色のミスドットがほとんどない。
３：色のミスドットがあるものの、少ない。
２：色のミスドットがやや多い。
１：色のミスドットが多い。
(Ii) Gravure printing reproducibility Printing machine GP-10 manufactured by Kurabo Industries, Inc. Printing speed: 30 m / min, ink used: DIC Corporation Dick Safe WH (aqueous) 10% interval gradation and gradation plate, halftone dot Visibility of 30% or less highlight and gradation, and the state of missed dots were judged by visual evaluation.
5: There is no color misdot.
4: There are almost no color misdots.
3: Although there are color misdots, there are few.
2: Slightly many color misdots.
1: There are many color misdots.
（ｉｉｉ））ベタ部のインキ泳ぎ（印刷ムラ）クラボウ社製印刷機ＧＰ−１０印刷速度：３０ｍ／分、使用インク：ＤＩＣ株式会社製ディックセーフＷＨ（水性）１０％間隔の階調とグラデーション版を用い、ベタ部やシャドー部（６０〜９５％の網点）の印刷ムラを目視評価で判定した。
５：印刷ムラが認められない。
４：僅かに印刷ムラが認められる。
３：軽度な印刷ムラが認められる。
２：印刷ムラが認められる。
１：明瞭な印刷ムラが認められる。
また表５に示されるように本発明の水性グラビア印刷用塗工紙は、片面塗工ではいずれも緊度０．７５ｇ／ｃｍ ３ 以上であり、軽量化による効率向上が図られると同時に過度の軽量化による印刷適性の悪化が防止されていることが分かる。
しかも表５に示されるように、実施例１〜４及び比較例１〜４のそれぞれについて特に大きな単位価格の違いはなく、本発明の実施例１〜４では特に大きなコストをかけることなく特性の大幅な向上を実現することができたことがわかる。
(Iii) Ink swimming in solid part (printing unevenness) Printing machine GP-10 manufactured by Kurabo Industries Co., Ltd. Printing speed: 30 m / min, ink used: DIC Corporation Dick Safe WH (aqueous) 10% interval gradation and gradation version The printing unevenness of the solid part and the shadow part (60 to 95% halftone dots) was determined by visual evaluation.
5: Printing unevenness is not recognized.
4: Print unevenness is slightly observed.
3: Slight printing unevenness is observed.
2: Printing unevenness is recognized.
1: Clear printing unevenness is recognized.
Further, as shown in Table 5, the aqueous gravure printing coated paper of the present invention has a tenacity of 0.75 g / cm 3 or more in single-sided coating, and at the same time an improvement in efficiency due to weight reduction is achieved and excessive It can be seen that deterioration in printability due to weight reduction is prevented.
In addition, as shown in Table 5, there is no particularly large unit price difference for each of Examples 1 to 4 and Comparative Examples 1 to 4, and Examples 1 to 4 of the present invention have characteristics that are not particularly expensive. It can be seen that a significant improvement was achieved.
Claims (6)
原紙の少なくとも一方の面に顔料とバインダーを主成分とする塗工層を設けた水性グラビア印刷用塗工紙において、原紙が表裏層と中層とからなり、少なくとも表層の表面に塗工される塗工層中の顔料として無機顔料１００質量部に対して有機顔料を０．１〜１２．０質量部、バインダーを８．０〜２３．０質量部含有し、カオリンを含む無機顔料１００質量部中に２０〜４０質量部の軽質炭酸カルシウム、２０〜４０質量部の重質炭酸カルシウムを含み、緊度０．７５ｇ／ｃｍ ３ 以上であり、パルプの叩解度は表層が中層よりも低いフリーネス（ＣＳＦ）を有すると共に表層のパルプの叩解度はカナダ標準濾水度（ＣＳＦ）でフリーネスが３９０〜４７０ｍｌＣＳＦとされることを特徴とする水性グラビア印刷用塗工紙。
In water-based gravure printing paper provided with a coating layer mainly composed of pigment and binder on at least one side of the base paper , the base paper is composed of front and back layers and a middle layer, and is coated at least on the surface of the surface layer. In 100 parts by mass of inorganic pigment containing 0.1 to 12.0 parts by mass of organic pigment, 8.0 to 23.0 parts by mass of binder, and 100 parts by mass of kaolin as the pigment in the working layer 20 to 40 parts by weight of light calcium carbonate, 20 to 40 parts by weight of heavy calcium carbonate, and a tenacity of 0.75 g / cm 3 or more, and the pulp beating degree is a freeness (CSF) whose surface layer is lower than the middle layer ) And the surface pulp has a Canadian standard freeness (CSF) and a freeness of 390 to 470 ml CSF .
３０〜５０質量部のカオリンを含む請求項１に記載の水性グラビア印刷用塗工紙。
The aqueous gravure-coated paper according to claim 1, comprising 30 to 50 parts by mass of kaolin.
中層のパルプの叩解度はカナダ標準濾水度（ＣＳＦ）でフリーネスが４３０〜５３０ｍｌＣＳＦとされる請求項１または請求項２に記載の水性グラビア印刷用塗工紙。
The coated paper for water-based gravure printing according to claim 1 or 2, wherein the beating degree of the middle layer pulp is Canadian standard freeness (CSF) and the freeness is 430 to 530 ml CSF.
全層のＮパルプ配合量が１．０〜１０．０質量部とされ、中層に針葉樹パルプ（ＮＢＫＰ）が５．０〜１５．０重量％配合される請求項１〜請求項３のいずれか一に記載の水性グラビア印刷用塗工紙。
The N pulp blending amount of all layers is 1.0 to 10.0 parts by mass, and 5.0 to 15.0% by weight of softwood pulp (NBKP) is blended in the middle layer. A coated paper for aqueous gravure printing according to 1.
１０５℃、３０秒加熱した時の引裂強度が１５００ｍＮ以下であり、常温引裂強度が１０００ｍＮ以上である請求項１〜請求項４のいずれか一に記載の水性グラビア印刷用塗工紙。
The aqueous gravure printing coated paper according to any one of claims 1 to 4, wherein the tear strength when heated at 105 ° C for 30 seconds is 1500 mN or less, and the normal temperature tear strength is 1000 mN or more.
表裏層と中層との層間強度が２００〜５００ｍＮ／ｃｍに調整される請求項１〜請求項５のいずれか一に記載の水性グラビア印刷用塗工紙。
The coated paper for aqueous gravure printing according to any one of claims 1 to 5, wherein the interlayer strength between the front and back layers and the middle layer is adjusted to 200 to 500 mN / cm.
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| JP2010065357A (en) * | 2008-09-12 | 2010-03-25 | Oji Paper Co Ltd | Coated liner and corrugated sheet using the same |
| JP5357606B2 (en) * | 2009-04-03 | 2013-12-04 | 大王製紙株式会社 | Multi-layer paper |
| JP5499573B2 (en) * | 2009-09-02 | 2014-05-21 | 王子ホールディングス株式会社 | Coating packaging paper |
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