JP6096026B2 - Coated paper for printing - Google Patents
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- JP6096026B2 JP6096026B2 JP2013067124A JP2013067124A JP6096026B2 JP 6096026 B2 JP6096026 B2 JP 6096026B2 JP 2013067124 A JP2013067124 A JP 2013067124A JP 2013067124 A JP2013067124 A JP 2013067124A JP 6096026 B2 JP6096026 B2 JP 6096026B2
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- coating layer
- pigment
- printing
- paper
- coated paper
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- 239000000049 pigment Substances 0.000 claims description 141
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- 239000007850 fluorescent dye Substances 0.000 claims description 39
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- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 22
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 10
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- 108010073771 Soybean Proteins Proteins 0.000 description 1
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- 150000001336 alkenes Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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Description
本発明は、印刷用塗工紙に係り、特に、高い白色度を有し、色調ムラの少ない印刷用塗工紙に関する。 The present invention relates to a coated paper for printing, and more particularly to a coated paper for printing having high whiteness and little color tone unevenness.
印刷用紙は、広告、宣伝を目的とした商業印刷分野での需要が高く、チラシ、カタログ、パンフレット、ダイレクトメール等、多岐に亘って利用されている。その生産量は年々着実に伸びており、中でも近年薄物コート紙および薄物塗工紙の生産量の伸び率が大きいことという特徴がある。 Printing paper is in high demand in the commercial printing field for the purpose of advertising and promotion, and is used in a wide variety of fields such as flyers, catalogs, pamphlets, and direct mail. The production volume is steadily increasing year by year, and in particular, the growth rate of the production volume of the thin coated paper and the thin coated paper is large.
印刷用紙に関する要望の一つとして、写真や図案を多用したり、カラー化するなどした印刷物への適性、すなわち、視覚的に内容を強力に伝達できる高品質印刷用塗工紙への強い要望がある。このような印刷用塗工紙としては、視覚的により白い印刷用塗工紙が求められ、また、省資源、輸送および郵送コストなど軽減の観点から用紙の軽量化も同時に求められている。 One of the demands for printing paper is its suitability for printed materials that use a lot of photographs and designs and colorization, that is, a strong demand for coated paper for high-quality printing that can visually convey the content. is there. As such a coated paper for printing, a white coated paper for printing is required visually, and from the viewpoint of saving resources, transportation, and mailing costs, a reduction in paper weight is also required at the same time.
印刷用塗工紙の白色度を高くするための効果的な手段の一つとして、塗工層に白色度の高い無機顔料を含有させる方法が知られている。このような無機顔料としては、例えば二酸化チタン、炭酸カルシウム、カオリンなどがある。これらの無機顔料のうち、二酸化チタンは高価で多量に使うとコスト高となる問題があることから、安価で白色度も比較的高い炭酸カルシウムが一般的に用いられてきた。炭酸カルシウムは、他に汎用されるカオリンと比較しても白色度の点で有利である。 As one of effective means for increasing the whiteness of the coated paper for printing, a method of containing an inorganic pigment having a high whiteness in the coating layer is known. Examples of such inorganic pigments include titanium dioxide, calcium carbonate, and kaolin. Of these inorganic pigments, titanium dioxide is expensive and has the problem of high costs when used in large quantities. Therefore, calcium carbonate, which is inexpensive and has a relatively high whiteness, has been generally used. Calcium carbonate is advantageous in terms of whiteness even when compared with other commonly used kaolin.
しかしながら、炭酸カルシウムは白色度の向上には寄与するものの他の無機顔料と比べて塗工層の不透明度はあまり上がらない。そのため、炭酸カルシウムを含む塗工層で一定水準の不透明度を得るためには塗工層の塗工量自体を増加させる必要があるが、塗工量の増加は品質面やコスト面での問題があるだけではなく用紙の重量を増すことにも繋がり、用紙の軽量化が求められている中では塗工量を増加させることは難しい。このような理由から、塗工層に炭酸カルシウムを多く含みながらも、その塗工量を比較的少なく維持したまま、高い不透明度を有する印刷用塗工紙が研究されてきた。 However, although calcium carbonate contributes to the improvement of whiteness, the opacity of the coating layer does not increase much compared to other inorganic pigments. Therefore, in order to obtain a certain level of opacity with a coating layer containing calcium carbonate, it is necessary to increase the coating amount of the coating layer itself, but the increase in the coating amount is a problem in terms of quality and cost. Not only does this lead to an increase in the weight of the paper, but it is difficult to increase the amount of coating when there is a demand for lighter paper. For these reasons, research has been conducted on printing coated papers having high opacity while containing a large amount of calcium carbonate in the coating layer and maintaining the coating amount relatively low.
また、無機顔料の添加以外で視覚的な白さを上げる方法としては、塗工層に青色や紫色の色材を含有させて調色する（ブルーイング）技術も知られている。これは、表面の色合いを青味を帯びた白とすることで、視覚的に感じる白さが増すことに基づく技術である。 Further, as a method for increasing visual whiteness other than the addition of an inorganic pigment, a technique for adjusting the color by adding a blue or purple color material to the coating layer (blueing) is also known. This is a technique based on increasing the visually perceived white color by making the surface shade bluish white.
このような印刷用塗工紙として、特許文献１及び特許文献２には、炭酸カルシウムと接着剤とを主成分とする塗工層中に紫色顔料および／または青色顔料を含有させ、ＪＩＳ Ｐ ８１５０の方法によって測定される印刷用紙の色相を、紫外線を含む測定においてａ*値が０以上７未満、ｂ*値が−１５以上−３未満とし、不透明度が８５％以上である印刷用塗工紙が開示されている。 As such printing paper for printing, Patent Document 1 and Patent Document 2 contain a purple pigment and / or a blue pigment in a coating layer mainly composed of calcium carbonate and an adhesive, and JIS P 8150. The hue of the printing paper measured by the above method is a coating for printing having an a * value of 0 or more and less than 7 and a b * value of −15 or more and less than −3 and an opacity of 85% or more in the measurement including ultraviolet rays. Paper is disclosed.
しかしながら、特許文献１及び特許文献２に開示された技術は、実用上十分なものとは言えなかった。特許文献１，２においては、不透明度の向上及びブルーイングのために紫色顔料および／または青色顔料を使用しているが、このような着色顔料を使用すると、塗工層表面に着色顔料に由来する色のスジ（以下、「色スジ」という。）が発生することがある。色スジの発生要因は様々あるが、例えば水系に十分に分散していない着色顔料や、塗工層用の塗料を入れたタンクの壁面で乾燥固化した着色顔料が、凝集物状の塊となって塗料中に混入することで、塗料を基紙に塗工した際にこれらの凝集物がスジ状に紙面に表れるものである。 However, the techniques disclosed in Patent Document 1 and Patent Document 2 have not been practically sufficient. In Patent Documents 1 and 2, purple pigments and / or blue pigments are used for improving opacity and bluing. When such colored pigments are used, they are derived from the colored pigments on the surface of the coating layer. Color streaks (hereinafter referred to as “color streaks”) may occur. There are various causes of color streaks, but for example, colored pigments that are not sufficiently dispersed in water or colored pigments that have been dried and solidified on the walls of the tank containing the paint for the coating layer form aggregates. By mixing in the paint, these aggregates appear on the paper surface in a streak shape when the paint is applied to the base paper.
また、着色顔料は塗工層の塗料中ではその粒子が分散された状態で存在するが、この分散性が悪い場合には塗工層に均一な発色感が得られず、色調ムラが生じることがある。特に、ブルーイングを目的として着色顔料を添加した塗工層は、その塗工量を少なくした場合に塗工層の単位面積あたりの着色顔料の含有量が少なくなることにより均一な発色感が得られないことがある。 In addition, the color pigment exists in a state where the particles are dispersed in the paint of the coating layer, but if this dispersibility is poor, a uniform color appearance cannot be obtained in the coating layer, resulting in uneven color tone. There is. In particular, a coating layer to which a coloring pigment is added for the purpose of bluing can obtain a uniform color development feeling by reducing the content of the coloring pigment per unit area of the coating layer when the coating amount is reduced. It may not be possible.
更には、近年、着色顔料の内の一部の有機顔料は、非意図的な副生物として微量のポリ塩化ビフェニル（ＰＣＢ）が含まれることが報告されている。ＰＣＢは化審法に基づく第一種特定化学物質であり、毒性も報告されており、このようなＰＣＢを含む可能性のある有機顔料を使用することは、特に印刷用塗工紙の製造現場において、健康上のリスクになる可能性がある。 Furthermore, in recent years, it has been reported that some organic pigments among colored pigments contain a trace amount of polychlorinated biphenyl (PCB) as an unintentional byproduct. PCB is a first-class specified chemical substance based on the Chemical Substances Control Law, and toxicity has been reported, and the use of such organic pigments that may contain PCB is especially the production site for coated paper for printing Can be a health risk.
本発明はこのような背景を鑑みて為された物であり、その目的とするところは、着色顔料を使用せず、高い白色度を有し、色調ムラの少ない印刷用塗工紙を提供することにある。 The present invention has been made in view of such a background, and an object thereof is to provide a coated paper for printing that does not use a color pigment, has high whiteness, and has little color tone unevenness. There is.
本発明の他の目的とするところは、先の特徴に加えて、比較的軽量である印刷用塗工紙を提供することにある。 Another object of the present invention is to provide a coated paper for printing which is relatively light in addition to the above features.
本発明の他の目的並びに作用効果については、以下の記述を参照することにより、当業者であれば容易に理解されるであろう。 Other objects and operational effects of the present invention will be easily understood by those skilled in the art by referring to the following description.
上記課題を解決するため、本発明の印刷用塗工紙は、パルプを主成分とする基紙の両面に、無機顔料と接着剤を含む顔料塗工層が設けられ、前記顔料塗工層に含まれる無機顔料は、全無機顔料のうち８０質量％以上が炭酸カルシウムであり、前記顔料塗工層は、更に紫色染料及び／又は青色染料を含有し、前記基紙には、パルプ１００質量部に対して０．０１〜２質量部の範囲で蛍光染料が含まれており、前記顔料塗工層の塗工量が基紙の片面あたり１５ｇ／ｍ2以下、白色度が８５％以上のものである。 In order to solve the above-mentioned problems, the coated paper for printing of the present invention is provided with a pigment coating layer containing an inorganic pigment and an adhesive on both sides of a pulp-based base paper, and the pigment coating layer The inorganic pigment included is 80% by mass or more of calcium carbonate in the total inorganic pigment, the pigment coating layer further contains a purple dye and / or a blue dye, and the base paper contains 100 parts by mass of pulp. Fluorescent dye is contained in the range of 0.01 to 2 parts by mass, the coating amount of the pigment coating layer is 15 g / m 2 or less per one side of the base paper, and the whiteness is 85% or more It is.
そして、このような構成によれば、顔料塗工層の塗工量が比較的少なくとも視覚的に強い白さを有し、色調ムラが少なく、また顔料塗工層が十分な塗工層強度を有した印刷用塗工紙とすることができる。 According to such a configuration, the coating amount of the pigment coating layer has at least a visually strong whiteness, there is little color tone unevenness, and the pigment coating layer has a sufficient coating layer strength. It can be set as the coating paper for printing which it had.
本発明の好ましい実施の形態においては、前記顔料塗工層が、０．３質量％以上の蛍光染料を含んでいてもよい。このような構成によれば、印刷用塗工紙の顔料塗工層により高い白色度と視覚的な白さを与えることができる。 In preferable embodiment of this invention, the said pigment coating layer may contain 0.3 mass% or more of fluorescent dyes. According to such a structure, high whiteness and visual whiteness can be given to the pigment coating layer of the printing coated paper.
本発明の好ましい実施の形態においては、坪量が７０ｇ／ｍ2以下であってもよい。このような構成によれば、軽量で白色度の高い印刷用塗工紙となるため、輸送コストの軽減等の面から好適である。 In a preferred embodiment of the present invention, the basis weight may be 70 g / m 2 or less. According to such a configuration, the coated paper for printing is lightweight and has high whiteness, which is preferable from the viewpoint of reducing transportation costs.
本発明の好ましい実施の形態においては、前記基紙がギャップフォーマにより抄紙されたものであってもよい。このような構成によれば、上述の特徴に加えて、平滑度の高い印刷用塗工紙が得られる。 In a preferred embodiment of the present invention, the base paper may be made by a gap former. According to such a configuration, in addition to the above-described features, a coated paper for printing with high smoothness can be obtained.
本発明の好ましい実施の形態においては、前記顔料塗工層がブレードコーター又はロッドコーターにより設けられたものであってもよい。このような構成によれば、上述の特徴に加えて、平滑度の高い印刷用塗工紙が得られる。 In a preferred embodiment of the present invention, the pigment coating layer may be provided by a blade coater or a rod coater. According to such a configuration, in addition to the above-described features, a coated paper for printing with high smoothness can be obtained.
本発明の好ましい実施の形態においては、カレンダーによる平滑化処理がなされたものであってもよい。このような構成によれば、上述の特徴に加えて、平滑度の高い印刷用塗工紙が得られる。 In a preferred embodiment of the present invention, a smoothing process using a calendar may be performed. According to such a configuration, in addition to the above-described features, a coated paper for printing with high smoothness can be obtained.
本発明の好ましい実施の形態においては、前記顔料塗工層に含まれる接着剤は、ポリビニルアルコール、変成ポリビニルアルコール、各種澱粉類、天然多糖類若しくはそのオリゴマー又はその変性体、から１種又は２種以上を用いるものであってもよい。このような構成によれば、顔料塗工層に蛍光染料が添加された場合であっても、蛍光染料の定着性が高く、塗工層強度に優れた印刷用塗工紙が得られる。 In preferable embodiment of this invention, the adhesive agent contained in the said pigment coating layer is 1 type or 2 types from polyvinyl alcohol, modified polyvinyl alcohol, various starches, natural polysaccharide or its oligomer, or its modified body. The above may be used. According to such a configuration, even when a fluorescent dye is added to the pigment coating layer, a coated paper for printing having a high fixability of the fluorescent dye and excellent strength of the coating layer can be obtained.
本発明の好ましい実施の形態においては、前記顔料塗工層に含まれる接着剤は、顔料塗工層中の無機顔料１００質量部に対して１〜２０質量部の範囲で含まれていてもよい。このような構成によれば、塗工層強度とインク吸収性のバランスに優れた印刷用塗工紙が得られる。 In preferable embodiment of this invention, the adhesive agent contained in the said pigment coating layer may be contained in 1-20 mass parts with respect to 100 mass parts of inorganic pigments in a pigment coating layer. . According to such a structure, the coated paper for printing excellent in the balance of coating layer strength and ink absorptivity can be obtained.
本発明の好ましい実施の形態においては、前記基紙は、紫色染料及び／又は青色染料を含有するものであってもよい。このような構成によれば、基紙の視覚的な白さがより向上し、顔料塗工層の隠蔽性が低く基紙の色合いが透けて見える場合であっても印刷用塗工紙全体としての白色度が低下しない印刷用塗工紙が得られる。 In a preferred embodiment of the present invention, the base paper may contain a purple dye and / or a blue dye. According to such a configuration, the visual whiteness of the base paper is further improved, the concealability of the pigment coating layer is low, and even when the color of the base paper is transparent, the entire coated paper for printing is used. The coated paper for printing in which the whiteness of the ink does not decrease is obtained.
また、本願発明は、印刷用塗工紙の顔料塗工層用の塗工液としても捉えることができる。 The present invention can also be understood as a coating liquid for a pigment coating layer of a printing coated paper.
本発明に係る印刷用塗工紙の顔料塗工層用の塗工液は、無機顔料と、接着剤と、染料とを含み、前記無機顔料のうち８０質量％以上が炭酸カルシウムであり、無機顔料１００質量部に対して１〜２０質量部の範囲で配合され、前記染料は、紫色染料及び／又は青色染料である、ことを特徴とするものである。 The coating liquid for the pigment coating layer of the coated paper for printing according to the present invention contains an inorganic pigment, an adhesive, and a dye, and 80% by mass or more of the inorganic pigment is calcium carbonate, and is inorganic. It mix | blends in 1-20 mass parts with respect to 100 mass parts of pigments, The said dye is a purple dye and / or a blue dye, It is characterized by the above-mentioned.
このような構成によれば、基紙となる用紙に塗工した際に、塗工量が比較的少なくとも視覚的に強い白さを有し、色調ムラが少なく、また顔料塗工層が十分な塗工層強度を有する顔料塗工層を形成することが可能な顔料塗工層用の塗工液が得られる。 According to such a configuration, when coated on the base paper, the coating amount is relatively at least visually strong white, there is little color tone unevenness, and the pigment coating layer is sufficient. A coating liquid for a pigment coating layer capable of forming a pigment coating layer having a coating layer strength is obtained.
また、本願発明は、印刷用塗工紙の製造方法としても捉えることができる。 The present invention can also be understood as a method for producing a coated paper for printing.
本発明に係る印刷用塗工紙の製造方法は、パルプと、パルプ１００質量部に対して０．０１〜２質量部の範囲の蛍光染料と、を配合して調製した紙料を、ギャップフォーマーを有する抄紙機にて抄紙して基紙を得るステップと、無機顔料と、接着剤と、紫色染料及び／又は青色染料と、を含む顔料塗工層用塗料を調製するステップと、前記基紙の両面に、基紙の片面あたり３〜１５ｇ／ｍ2（乾燥重量）の範囲で、ブレードコーター又はロッドコーターを用いて前記顔料塗工層用塗料を塗工して顔料塗工層を設けるステップとを有し、前記顔料塗工層に含まれる無機顔料は、全無機顔料のうち８０質量％以上が炭酸カルシウムであり、前記基紙には、パルプ１００質量部に対して０．０１〜２質量部の範囲で蛍光染料が含まれており、得られた印刷用塗工紙の白色度が８５％以上である、ことを特徴とする。 The method for producing a coated paper for printing according to the present invention comprises a paper material prepared by blending pulp and a fluorescent dye in the range of 0.01 to 2 parts by mass with respect to 100 parts by mass of pulp. A step of obtaining a base paper by making a paper with a paper machine having a mer, a step of preparing a pigment coating layer coating comprising an inorganic pigment, an adhesive, and a purple dye and / or a blue dye; The pigment coating layer is provided on both sides of the paper by applying the pigment coating layer paint using a blade coater or a rod coater within a range of 3 to 15 g / m 2 (dry weight) per side of the base paper. The inorganic pigment contained in the pigment coating layer is 80% by mass or more of calcium carbonate among all inorganic pigments, and the base paper has 0.01 to 100 parts by mass with respect to 100 parts by mass of pulp. Fluorescent dye is contained in the range of 2 parts by mass and obtained Whiteness of coated printing paper is 85% or more, and wherein the.
そして、このような構成によれば、高い白色度を有し、色調ムラが少なく、更に比較的軽量で平滑度も高い印刷用塗工紙を製造することができる。 According to such a configuration, it is possible to produce a coated paper for printing having high whiteness, little color unevenness, relatively light weight and high smoothness.
本発明の印刷用塗工紙によれば、顔料塗工層の塗工量が比較的少ない場合であっても高い白色度を有し、色調ムラの少ない印刷用塗工紙を得ることができる。特に、本発明の印刷用紙は視覚的に強い白さを有し、機器で測定する白色度よりも白さが際だって見える。また、特に低米坪品において、優れた視覚的白さを発揮する。更に、色スジの無い印刷用塗工紙とすることができる。 According to the printing coated paper of the present invention, it is possible to obtain a printing coated paper having high whiteness and little color tone unevenness even when the coating amount of the pigment coating layer is relatively small. . In particular, the printing paper of the present invention has a visually strong whiteness, and the whiteness is more noticeable than the whiteness measured by the instrument. In addition, it exhibits excellent visual whiteness, particularly in low-US basis products. Furthermore, it can be set as the coated paper for printing without a color stripe.
また、本発明に係る印刷用塗工紙の製造方法によれば、高い白色度を有し、色調ムラが少なく、更に比較的軽量で平滑度も高い印刷用塗工紙を製造することができる。 Moreover, according to the method for producing a coated paper for printing according to the present invention, it is possible to produce a coated paper for printing having high whiteness, little color unevenness, relatively light weight and high smoothness. .
以下に、本発明に係る印刷用塗工紙、及び印刷用塗工紙の製造方法の好適な実施の形態を詳細に説明する。 Hereinafter, preferred embodiments of the coated paper for printing and the method for producing the coated paper for printing according to the present invention will be described in detail.
先にも述べたように、本発明の印刷用塗工紙は、基紙の両面に顔料塗工層を設けてなるものである。本発明においては、高白色度と色調ムラ防止とを着色顔料を使用せずに両立させるために、基紙と顔料塗工層の双方において工夫を行った。 As described above, the printing coated paper of the present invention is provided with a pigment coating layer on both sides of the base paper. In the present invention, in order to achieve both high whiteness and prevention of uneven color tone without using a color pigment, the present invention has been devised in both the base paper and the pigment coating layer.
先ずはじめに、顔料塗工層の構成について詳細に説明する。本発明においては、高い白色度を有し、且つ比較的軽量である印刷用塗工紙とするために、顔料塗工層に含まれる無機顔料の内、炭酸カルシウムの割合を高くする。具体的には、顔料塗工層に含まれる無機顔料の内、８０質量％以上を炭酸カルシウムとする。なお、ここで用いる炭酸カルシウムとしては、重質炭酸カルシウム、軽質炭酸カルシウムのどちらを用いてもよい。 First, the configuration of the pigment coating layer will be described in detail. In the present invention, in order to obtain a coated paper for printing having high whiteness and relatively light weight, the proportion of calcium carbonate in the inorganic pigment contained in the pigment coating layer is increased. Specifically, 80% by mass or more of the inorganic pigment contained in the pigment coating layer is calcium carbonate. As the calcium carbonate used here, either heavy calcium carbonate or light calcium carbonate may be used.
また、本発明において、顔料塗工層には炭酸カルシウムに加えて他の無機顔料を１種又は２種以上併用してもよく、このような無機顔料としては、例えば、カオリン、タルク、サチンホワイト、リトポン、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、炭酸マグネシウムなどが挙げられる。 In the present invention, the pigment coating layer may be used in combination with one or more other inorganic pigments in addition to calcium carbonate. Examples of such inorganic pigments include kaolin, talc, and satin white. Lithopone, titanium dioxide, silica, alumina, aluminum hydroxide, zinc oxide, magnesium carbonate and the like.
しかしながら、炭酸カルシウムの割合が高ければ高いほど後述する本発明の目的とする効果を発揮しやすく、発明者等の知見によれば、顔料塗工層に含まれる無機顔料の内、９０質量％以上が炭酸カルシウムであればより本発明の効果を発揮しやすく、９５質量％以上であれば更に本発明の効果を発揮しやすくなり、１００質量％すなわち顔料塗工層に含まれる無機顔料を全て炭酸カルシウムとすることで、本発明の効果が最大となる。 However, the higher the proportion of calcium carbonate, the easier it is to achieve the effects of the present invention described later. According to the knowledge of the inventors, 90% by mass or more of the inorganic pigment contained in the pigment coating layer. If the calcium carbonate is calcium carbonate, the effect of the present invention is more easily exerted, and if it is 95% by mass or more, the effect of the present invention is more easily exhibited. By using calcium, the effect of the present invention is maximized.
本発明において、顔料塗工層には紫色染料及び／又は青色染料を含有させる。ここで「染料」とは、いわゆる着色用の染料（着色染料）のことであって、可視光線を選択吸収または反射して固有の色を持つ有機色素のうち、適当な染色法により物質に染着するものをいい、水や有機溶剤などの溶媒に可溶である。 In the present invention, the pigment coating layer contains a purple dye and / or a blue dye. Here, the “dye” is a so-called coloring dye (colored dye). Among organic dyes having a specific color by selectively absorbing or reflecting visible light, the dye is dyed onto a substance by an appropriate dyeing method. It is the one that wears and is soluble in water and organic solvents.
一般に、顔料塗工層に含有させることができる色材としては着色染料と着色顔料とが考えられるが、このうち着色顔料は着色染料に比べて粒子が大きく、また塗料中では分散した状態で存在するため、着色顔料で着色された顔料塗工層は顔料粒子が密な部分と疎な部分とが生じやすく、これにより紙面全体で均一に光を吸収・反射することができず、色調ムラが起こりやすい。加えて、塗料中での着色顔料の分散状態が悪ければ、色スジの発生も懸念される。 In general, coloring dyes and coloring pigments are conceivable as coloring materials that can be contained in the pigment coating layer. Of these, coloring pigments have larger particles than coloring dyes, and exist in a dispersed state in the paint. Therefore, a pigment coating layer colored with a colored pigment tends to have dense and sparse pigment particles, which makes it impossible to absorb and reflect light uniformly over the entire paper surface, resulting in uneven color tone. It is easy to happen. In addition, if the dispersion state of the colored pigment in the paint is poor, there is a concern about the generation of color streaks.
一方、着色染料を顔料塗工層用の塗料に添加すると、着色染料は分子レベルで塗料中に溶解するため塗料は均一に着色され、その塗料を塗工することで設けられた顔料塗工層も部分的な隔たりがなく均一に光を吸収・反射するものとなり、色調ムラが生じ難い。これらの点で着色染料は着色顔料より優れているため、本発明においては色材の中でも着色染料を選択して用いた。 On the other hand, when a colored dye is added to the paint for the pigment coating layer, the colored dye dissolves in the paint at the molecular level, so the paint is uniformly colored, and the pigment coating layer provided by applying the paint However, there is no partial separation, and the light is uniformly absorbed and reflected, so that uneven color tone hardly occurs. In these respects, since the colored dye is superior to the colored pigment, in the present invention, the colored dye is selected and used among the color materials.
本発明においては、着色染料の中でもブルーイングを目的に紫色及び／又は青色の染料を顔料塗工層中に含有させる。用いる紫色及び／又は青色染料としては特に限定するものではないが、紫色染料としては、例えばカヤフェクトバイオレットＰリキッド２００（日本化薬社製）、ダイレクトペーパーバイオレットＢリキッド（日本化学工業所社製）などが挙げられ、青色染料としては、例えばカヤフェクトブルーＦリキッド（日本化薬社製）、ダイレクトペーパーブルー４ＧＬ（日本化学工業所社製）などが挙げられる。 In the present invention, among the colored dyes, a violet and / or blue dye is included in the pigment coating layer for the purpose of bluing. The purple and / or blue dye to be used is not particularly limited. Examples of the purple dye include Kayafect Violet P Liquid 200 (manufactured by Nippon Kayaku Co., Ltd.) and Direct Paper Violet B Liquid (manufactured by Nippon Chemical Industry Co., Ltd.). Examples of blue dyes include Kayafect Blue F Liquid (manufactured by Nippon Kayaku Co., Ltd.) and Direct Paper Blue 4GL (manufactured by Nippon Chemical Industry Co., Ltd.).
本発明において紫色染料及び／又は青色染料の顔料塗工層中の含有量は特に限定するものではなく、目的とするブルーイングの程度に応じて適宜変更することができる。ただし、印刷用塗工紙としては視覚的に青味を帯びた白とする必要があるため、ＪＩＳ Ｐ ８１５０の方法によって測定される印刷用塗工紙の色相を、紫外線を含む測定においてａ*値が０以上７未満、ｂ*値が−１５以上−３未満の範囲となるよう紫色染料及び／又は青色染料の顔料塗工層への含有量を調整することが好ましい。紫色染料及び／又は青色染料の添加量はａ*値及びｂ*値が上述の範囲を満たすことを目安としているため、基紙の白色度、顔料塗工層の白色度、顔料塗工層の塗工量など多くの要因に影響されるが、一例として、顔料塗工層を片面当たり１０ｇ／ｍ2設ける場合には、無機顔料１００質量部あたり０．０２〜０．１質量部程度の紫色染料及び／又は青色染料を添加することで目的とする色相の印刷用塗工紙が得られる。 In the present invention, the content of the purple dye and / or blue dye in the pigment coating layer is not particularly limited, and can be appropriately changed according to the intended degree of bluing. However, since it is necessary for the coated paper for printing to be visually bluish white, the hue of the coated paper for printing measured by the method of JIS P 8150 is a * in the measurement including ultraviolet rays . It is preferable to adjust the content of the purple dye and / or the blue dye in the pigment coating layer so that the value is in the range of 0 or more and less than 7, and the b * value is in the range of −15 or more and less than −3. The addition amount of the purple dye and / or blue dye is based on the fact that the a * value and the b * value satisfy the above-mentioned ranges. Therefore, the whiteness of the base paper, the whiteness of the pigment coating layer, the pigment coating layer Although affected by many factors such as the coating amount, as an example, when a pigment coating layer is provided at 10 g / m 2 per side, purple of about 0.02 to 0.1 parts by mass per 100 parts by mass of the inorganic pigment By adding a dye and / or a blue dye, a coated paper for printing having a target hue can be obtained.
また本発明においては、顔料塗工層の白色度をより向上させるために、顔料塗工層中に紫色染料及び／又は青色染料の他に蛍光染料を含有させてもよい。顔料塗工層中の蛍光染料の含有量は、特に限定するものではないが、顔料塗工層に対して０．３質量％以上とすることが好ましい。より好ましくは０．５質量％以上であり、更に好ましくは０．７質量％以上である。上限は特に限定するものではないが、過剰に添加しても蛍光強度は頭打ちとなるだけでなく褪色が大きくなるおそれがあるため、顔料塗工層に対して２．０質量％以下とすることが好ましい。顔料塗工層中に蛍光染料を含有させることで、より高い白色度と視覚的な白さとを向上させることができる。 In the present invention, in order to further improve the whiteness of the pigment coating layer, the pigment coating layer may contain a fluorescent dye in addition to the purple dye and / or the blue dye. Although content of the fluorescent dye in a pigment coating layer is not specifically limited, It is preferable to set it as 0.3 mass% or more with respect to a pigment coating layer. More preferably, it is 0.5 mass% or more, More preferably, it is 0.7 mass% or more. The upper limit is not particularly limited, but even if it is added excessively, the fluorescence intensity will not only reach a peak, but there is a possibility that the discoloration may increase, so it should be 2.0% by mass or less based on the pigment coating layer. Is preferred. Inclusion of a fluorescent dye in the pigment coating layer can improve higher whiteness and visual whiteness.
本発明において顔料塗工層には、無機顔料、紫色染料及び／又は青色染料の他に接着剤も含有させる。接着剤は主に塗工層の強度を向上させることなどを目的として添加するものであり、例えば、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種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、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、燐酸エステル化澱粉、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、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、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などの天然多糖類若しくはそのオリゴマー又はその変性体、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又はその変性体、ポリ乳酸、ペプチドなどの合成高分子又はオリゴマー、の中から単独又は２種以上を組み合わせて使用する。 In the present invention, the pigment coating layer contains an adhesive in addition to the inorganic pigment, purple dye and / or blue dye. The adhesive is mainly added for the purpose of improving the strength of the coating layer, for example, various copolymer latexes such as styrene-butadiene, acrylic, polyvinyl acetate, ethylene-vinyl acetate, Polyvinyl alcohol, modified polyvinyl alcohol, sodium polyacrylate, polyethylene oxide, polyacrylamide, urea or melamine / formalin resin, polyethyleneimine, polyamide polyamine / epichlorohydrin and other water-soluble compounds, starch purified from natural plants, hydroxyethylated starch , Oxidized starch, etherified starch, phosphate esterified starch, enzyme-modified starch and cold water soluble starch obtained by flash drying them, dextrin, mannan, chitosan, arabinogalactan, glycogen, inulin, pectin , Natural polysaccharides such as hyaluronic acid, carboxymethylcellulose, hydroxyethylcellulose or oligomers thereof or modified products thereof, natural proteins such as casein, gelatin, soybean protein, collagen, or modified products thereof, synthetic polymers or oligomers such as polylactic acid, peptides, etc. Are used alone or in combination of two or more.
顔料塗工層中の接着剤の配合量は、顔料塗工層中の無機顔料１００質量部に対して１〜２０質量部の範囲であることが好ましく、４〜１５質量部の範囲であることがより好ましく、６〜１３質量部の範囲とすることが更に好ましい。接着剤の配合量が１質量部未満の場合には、塗工層の強度が十分に得られず印刷強度が不足するおそれがある。一方、接着剤の配合量が２０質量部を超えると、相対的に無機顔料の配合割合が下がることから印刷インクの吸収が悪化し、乾燥不良となるおそれがある。 The blending amount of the adhesive in the pigment coating layer is preferably in the range of 1 to 20 parts by mass with respect to 100 parts by mass of the inorganic pigment in the pigment coating layer, and is in the range of 4 to 15 parts by mass. Is more preferable, and it is still more preferable to set it as the range of 6-13 mass parts. When the blending amount of the adhesive is less than 1 part by mass, the strength of the coating layer cannot be sufficiently obtained, and the printing strength may be insufficient. On the other hand, when the blending amount of the adhesive exceeds 20 parts by mass, the blending ratio of the inorganic pigment is relatively decreased, so that the absorption of the printing ink is deteriorated and there is a possibility that the drying may be poor.
またここで、顔料塗工層に蛍光染料を含有させる場合には、蛍光染料の定着性を向上させる観点から、顔料塗工層に添加する接着剤はポリビニルアルコール、変成ポリビニルアルコール、各種澱粉類、天然多糖類若しくはそのオリゴマー又はその変性体から選ばれる１種以上を使用することが好ましく、ポリビニルアルコール、変成ポリビニルアルコール、澱粉類、カルボキシメチルセルロースから選ばれる１種以上を使用することが特に好ましい。 Here, when the pigment coating layer contains a fluorescent dye, from the viewpoint of improving the fixing property of the fluorescent dye, the adhesive added to the pigment coating layer is polyvinyl alcohol, modified polyvinyl alcohol, various starches, It is preferable to use at least one selected from natural polysaccharides or oligomers thereof or modified products thereof, and it is particularly preferable to use at least one selected from polyvinyl alcohol, modified polyvinyl alcohol, starches, and carboxymethylcellulose.
本発明の顔料塗工層には、無機顔料、接着剤、着色染料、蛍光染料の他に、本発明の効果を阻害しない範囲で、必要に応じて、分散剤、増粘剤、保水剤、消泡剤、耐水化剤、等の通常の印刷用塗工紙の顔料塗工層に配合される各種助剤を使用してもよい。 In the pigment coating layer of the present invention, in addition to inorganic pigments, adhesives, colored dyes, fluorescent dyes, as long as the effects of the present invention are not impaired, a dispersant, a thickener, a water retention agent, You may use various adjuvants mix | blended with the pigment coating layer of normal coating paper for printing, such as an antifoamer and a water-resistant agent.
本発明においては、比較的軽量な印刷用塗工紙とするために、顔料塗工層の基紙への塗工量は基紙の片面当たり１５ｇ／ｍ2以下（乾燥重量）とする。本発明に用いる顔料塗工層用塗料は塗工量が少ない場合にその効果をより発揮しやすいものであるため塗工量の下限は特に限定するものではないが、印刷適性を考慮すると３ｇ／ｍ2以上とすることが好ましい。また、顔料塗工層の基紙への塗工量が基紙の片面当たり５〜１２ｇ／ｍ2の範囲であればより好ましく、６〜１０ｇ／ｍ2の範囲であれば更に好ましい。 In the present invention, in order to obtain a comparatively lightweight coated paper for printing, the coating amount of the pigment coating layer on the base paper is 15 g / m 2 or less (dry weight) per side of the base paper. The pigment coating layer paint used in the present invention is more likely to exert its effect when the coating amount is small, so the lower limit of the coating amount is not particularly limited, but considering the printability, 3 g / m 2 or more is preferable. The coating amount of the pigment coating layer on the base paper is more preferably in the range of 5 to 12 g / m 2 per side of the base paper, and further preferably in the range of 6 to 10 g / m 2 .
本発明において顔料塗工層は、前記した炭酸カルシウムを主成分とする無機顔料、接着剤、着色染料などの他各種材料を混合し、適当な固形分濃度に調整して得られた塗工液を基紙上に塗工した後、乾燥させることで設けることができる。塗工液を基紙に塗工する方法としては、例えば、液だまりを有するサイズプレス、メタリングサイズプレス、ゲートロール、シムサイザーなどの各種フィルムトランスファーコーター、エアーナイフコーター、ブレードコーター、ロッドコーター、ダイレクトファウンテンコーター、スプレーコーター、カーテンコーターを使用することができる。中でもブレードコーター又はロッドコーターを用いて塗工液を塗工する場合には、本発明に係る顔料塗工層用塗工液の構成は有利となる。 In the present invention, the pigment coating layer is a coating solution obtained by mixing various materials such as an inorganic pigment mainly composed of calcium carbonate, an adhesive, and a coloring dye, and adjusting the concentration to an appropriate solid content. Can be provided by drying on a base paper. Examples of methods for applying the coating liquid to the base paper include various film transfer coaters such as a size press having a puddle, a metering size press, a gate roll, and a shim sizer, an air knife coater, a blade coater, a rod coater, and a direct coater. Fountain coaters, spray coaters and curtain coaters can be used. In particular, when the coating liquid is applied using a blade coater or a rod coater, the configuration of the coating liquid for a pigment coating layer according to the present invention is advantageous.
ブレードコーターやロッドコーターはブレードやロッドで塗工液を基紙に押しつけるようにして塗工する装置であるため、エアーナイフコーター等で設けた顔料塗工層に比べて平滑性が高く面感の良い顔料塗工層が得られるという利点があるが、その一方で色調ムラが目立ちやすくなるという問題点もある。加えて、これらの塗工方法を用いると塗料中に塗料成分の塊状物などがある場合には所謂ストリークを発生させやすい傾向にあり、更に顔料塗工層中に着色顔料を含有させた場合には、ストリークの場合と同様に顔料の凝集物等により前述の色スジが発生するおそれが増大する。本発明においては、顔料塗工層を着色染料で着色するため、塗工液中顔料由来の塊状物等が発生しにくく、ブレードコーターやロッドコーターを用いて顔料塗工層を設けた場合であっても、色スジが発生することなく、また色調ムラも目立ちにくくすることができる。 The blade coater and rod coater are devices that apply the coating liquid against the base paper with the blade or rod, so the smoothness is higher than the pigment coating layer provided with an air knife coater, etc. While there is an advantage that a good pigment coating layer can be obtained, there is also a problem that uneven color tone is easily noticeable. In addition, when these coating methods are used, there is a tendency that so-called streaks are likely to occur when there is a lump of paint components in the paint, and further when a colored pigment is contained in the pigment coating layer. As in the case of streak, there is an increased possibility that the above-mentioned color streaks are caused by pigment aggregates and the like. In the present invention, since the pigment coating layer is colored with a coloring dye, a lump or the like derived from the pigment is not easily generated in the coating liquid, and the pigment coating layer is provided using a blade coater or a rod coater. However, color streaks are not generated, and color tone unevenness can be made inconspicuous.
ところで、前述のとおり、着色染料は着色顔料に比べて顔料塗工層を均一に着色できるという利点があるが、その一方で、着色染料で着色された顔料塗工層は着色顔料で着色された顔料塗工層に比べて不透明度を得られ難いという問題がある。換言すれば、着色染料で着色された顔料塗工層は着色顔料で着色された顔料塗工層に比べて光を透過しやすい傾向にあり、この現象は印刷用塗工紙としての不透明度だけでなく白色度にも不利な要因となる。即ち、（１）もともと高い不透明度が得られ難い炭酸カルシウムを顔料塗工層の主成分とすること、（２）着色顔料に比べて不透明度の向上に乏しい着色染料を含有させること、（３）基紙への塗工量を比較的少なくすること、という（１）〜（３）の要件を備えた本願の印刷用塗工紙は、不透明度が上がりにくく、また、十分な白色度も得られないおそれがある。 By the way, as described above, the colored dye has an advantage that the pigment coating layer can be uniformly colored as compared with the colored pigment. On the other hand, the pigment coated layer colored with the colored dye is colored with the colored pigment. There is a problem that it is difficult to obtain opacity as compared with the pigment coating layer. In other words, a pigment coating layer colored with a coloring dye tends to transmit light more easily than a pigment coating layer colored with a coloring pigment, and this phenomenon is only the opacity as a coating paper for printing. It is also a disadvantageous factor for whiteness. (1) Calcium carbonate, which is originally difficult to obtain high opacity, is used as a main component of the pigment coating layer, (2) a coloring dye which is less improved in opacity than a colored pigment is contained, (3 ) The coated paper for printing of the present application having the requirements of (1) to (3) that the amount of coating on the base paper is relatively small is not easily increased in opacity and has sufficient whiteness. May not be obtained.
更に、顔料塗工層で基紙を十分に隠蔽することができないために基紙の白色度が印刷用塗工紙の白色度にも影響を及ぼすこととなり、基紙の白色度が低ければ印刷用塗工紙の白色度の低下にも繋がる。また基紙の色合いが十分に隠蔽されない場合のもう一つの問題として、基紙と顔料塗工層の色調の差が大きくなると視覚的な白色感にムラを生ずるおそれもある。これらはクレーや二酸化チタンを主成分とする顔料塗工層や、着色顔料で着色された顔料塗工層など、基紙の隠蔽性が高い顔料塗工層を設ける場合には問題とならない点である。 Furthermore, since the base paper cannot be sufficiently concealed by the pigment coating layer, the whiteness of the base paper also affects the whiteness of the coated paper for printing. If the whiteness of the base paper is low, printing is performed. This also leads to a decrease in the whiteness of the coated paper. Another problem when the color of the base paper is not sufficiently concealed is that the difference in color tone between the base paper and the pigment coating layer may cause uneven visual whiteness. These do not pose a problem when providing a pigment coating layer having a high base concealment property, such as a pigment coating layer mainly composed of clay or titanium dioxide, or a pigment coating layer colored with a colored pigment. is there.
そこで、本発明においては、基紙に蛍光染料を含有させることで基紙の白色度と視覚的な白さとを向上させる。前述のように隠蔽性の高い顔料塗工層を設ける場合には基紙の白さを向上させても印刷用塗工紙としての白さは殆ど或いは全く向上しないが、本発明の印刷用塗工紙のように顔料塗工層の隠蔽性が十分でない場合は、基紙に蛍光染料を含有させることで、白色度と視覚的な白さの向上が図れる。これは基紙が発する蛍光を顔料塗工層で遮り難いことも一つの要因と考えられる。また、蛍光染料は褪色しやすい傾向があるが、基紙に含有させることで顔料塗工層に含有させた場合よりも褪色が起こりにくいという利点もある。 Therefore, in the present invention, the whiteness and visual whiteness of the base paper are improved by adding a fluorescent dye to the base paper. As described above, in the case of providing a pigment coating layer having high concealability, even if the whiteness of the base paper is improved, the whiteness as a printing paper is hardly or not improved at all. When the concealability of the pigment coating layer is not sufficient as in the case of working paper, whiteness and visual whiteness can be improved by adding a fluorescent dye to the base paper. This may be due to the fact that the fluorescence emitted from the base paper is difficult to block by the pigment coating layer. In addition, fluorescent dyes tend to fade easily, but there is also an advantage that fading is less likely to occur when contained in a base paper than when incorporated in a pigment coating layer.
更に、顔料塗工層にも蛍光染料を含有させることで基紙と顔料塗工層との色調の差がより小さくなり、印刷用塗工紙としての視覚的な白色感のムラをより抑えることが可能となる。 In addition, by including fluorescent dyes in the pigment coating layer, the difference in color tone between the base paper and the pigment coating layer is reduced, and the unevenness of the visual whiteness of the coated paper for printing is further suppressed. Is possible.
次に、本発明における基紙の構成について詳細に説明する。本発明において、基紙中の蛍光染料の含有量は、基紙を構成するパルプ１００質量部に対して０．０１質量部以上とし、好ましくは０．０２質量部以上であり、より好ましくは０．０２５質量部以上である。本発明の印刷用塗工紙は白色度が８５％以上となるように構成するものであるが、蛍光染料の含有量が基紙を構成するパルプ１００質量部に対して０．０１質量部未満の場合は目的とする白色度及び視覚的な白さを得られ難い。蛍光染料の含有量の上限は特に限定するものではないが、過剰に添加しても蛍光強度は頭打ちとなるため、パルプ１００質量部に対して２質量部以下とすることが好ましい。 Next, the configuration of the base paper in the present invention will be described in detail. In the present invention, the content of the fluorescent dye in the base paper is 0.01 parts by mass or more with respect to 100 parts by mass of the pulp constituting the base paper, preferably 0.02 parts by mass or more, more preferably 0. 0.025 parts by mass or more. The coated paper for printing of the present invention is configured so that the whiteness is 85% or more, but the content of the fluorescent dye is less than 0.01 parts by mass with respect to 100 parts by mass of the pulp constituting the base paper. In this case, it is difficult to obtain the desired whiteness and visual whiteness. The upper limit of the content of the fluorescent dye is not particularly limited, but even if it is added excessively, the fluorescence intensity reaches its peak, so that it is preferably 2 parts by mass or less with respect to 100 parts by mass of the pulp.
本発明において印刷用塗工紙に用いる基紙は、パルプを主成分とするものであり、使用するパルプとしては、例えば、ＬＢＫＰ（広葉樹さらしクラフトパルプ）、ＮＢＫＰ（針葉樹さらしクラフトパルプ）などの化学パルプ、ＧＰ（砕木パルプ）、ＰＧＷ（加圧式砕木パルプ）、ＲＭＰ（リファイナーメカニカルパルプ）、ＴＭＰ（サーモメカニカルパルプ）、ＣＴＭＰ（ケミサーモメカニカルパルプ）、ＣＭＰ（ケミメカニカルパルプ）、ＣＧＰ（ケミグランドパルプ）などの機械パルプ、ＤＩＰ（脱インキパルプ）などの木材パルプ又はケナフ、バガス、竹、コットンなどの非木材パルプなどを用いることができる。また、品質に支障がでない範囲において合成繊維を使用してもよく、また、環境保全の観点から、ＥＣＦ（Ｅｌｅｍｅｎｔａｌ Ｃｈｌｏｒｉｎｅ Ｆｒｅｅ）パルプ、ＴＣＦ（Ｔｏｔａｌ Ｃｈｌｏｒｉｎｅ Ｆｒｅｅ）パルプ、古紙パルプ、植林木から得られるパルプを用いてもよい。本発明においては、これらのパルプを単独で使用してもよいし、２種以上を任意の割合で混合して使用してもよい。これらのパルプの中でもＬＢＫＰを主体とするものが好ましいが、チラシ、カタログ、パンフレットなどに用いられた場合に折り加工適性を満足できるように、パルプの全質量に対してＮＢＫＰを３〜２０質量％、より好ましくは４〜１５質量％含有することが望ましい。また、基紙の白色度を上げるために、白色度が８４％以上のパルプを用いることが好ましい。 The base paper used for the coated paper for printing in the present invention is mainly composed of pulp. Examples of the pulp used include chemicals such as LBKP (hardwood bleached kraft pulp) and NBKP (softwood bleached kraft pulp). Pulp, GP (ground wood pulp), PGW (pressurized ground wood pulp), RMP (refiner mechanical pulp), TMP (thermomechanical pulp), CTMP (chemithermomechanical pulp), CMP (chemimechanical pulp), CGP (chemiground pulp) ) And other wood pulp such as DIP (deinked pulp) or non-wood pulp such as kenaf, bagasse, bamboo, and cotton. In addition, synthetic fibers may be used as long as the quality is not hindered. From the viewpoint of environmental conservation, they can be obtained from ECF (Elemental Chlorine Free) pulp, TCF (Total Chlorine Free) pulp, waste paper pulp, and planted trees. Pulp may be used. In the present invention, these pulps may be used alone, or two or more kinds thereof may be mixed and used in an arbitrary ratio. Among these pulps, those mainly composed of LBKP are preferable, but NBKP is used in an amount of 3 to 20% by mass based on the total mass of the pulp so that the suitability for folding can be satisfied when used in flyers, catalogs, pamphlets and the like. More preferably, the content is 4 to 15% by mass. In order to increase the whiteness of the base paper, it is preferable to use a pulp having a whiteness of 84% or more.
本発明における基紙には、適宜填料を含有させることができる。填料としては、基紙の白色度及び不透明度の向上とコスト面での観点から軽質炭酸カルシウムを用いることが好ましいが、重質炭酸カルシウム、タルク、クレー、カオリン、二酸化チタン、水酸化アルミニウムなどの填料を用いてもよい。これらの填料は単独で用いても、２種以上を併用して用いてもよい。填料の基紙への含有量は特に限定するものではないが、パルプ１００質量部に対して２〜２５質量部の範囲であることが好ましく、より好ましくは３〜２０質量部、さらに好ましくは４〜１０質量部の範囲である。 The base paper in the present invention can appropriately contain a filler. As the filler, it is preferable to use light calcium carbonate from the viewpoint of improvement in whiteness and opacity of the base paper and cost, but heavy calcium carbonate, talc, clay, kaolin, titanium dioxide, aluminum hydroxide, etc. Fillers may be used. These fillers may be used alone or in combination of two or more. The content of the filler in the base paper is not particularly limited, but is preferably in the range of 2 to 25 parts by mass, more preferably 3 to 20 parts by mass, and still more preferably 4 to 100 parts by mass of the pulp. It is the range of -10 mass parts.
本発明における基紙にはパルプと填料の他に、紙力増強剤、サイズ剤、嵩高剤、歩留り向上剤、濾水性向上剤、硫酸バンド、湿潤紙力増強剤、着色染料、着色顔料、ピッチコントロール剤など、公知の製紙用添加剤を本発明の目的を損なわない範囲で適宜添加してもよい。 In addition to pulp and filler, the base paper in the present invention is a paper strength enhancer, a sizing agent, a bulking agent, a yield improver, a drainage improver, a sulfuric acid band, a wet paper strength enhancer, a coloring dye, a coloring pigment, a pitch. You may add suitably well-known papermaking additives, such as a control agent, in the range which does not impair the objective of this invention.
また、本発明において基紙には、顔料塗工層を形成するための塗工液が過度に基紙に浸透するのを抑える又は基紙の表面強度向上のために、サイズプレスなどで澱粉、ポリビニルアルコール、ポリアクリルアミドなどの公知の水溶性高分子を含むサイズ液を塗布してもよい。この場合に用いるサイズ液には、助剤として、例えば、スチレン系サイズ剤、スチレン−アクリレート系サイズ剤、オレフィン系サイズ剤、ＡＫＤ、ＡＳＡなどの表面サイズ剤、着色染料、蛍光染料、消泡剤を併用してもよい。サイズ液を塗布する場合の塗布方法としては、例えば、サイズプレス、ゲートロールコーター、メタリングサイザー、ロッドコーター、エアーナイフコーターなどの一般的な塗布方法を用いることができる。 Further, in the present invention, the base paper is starched by a size press or the like in order to suppress excessive penetration of the coating liquid for forming the pigment coating layer into the base paper or to improve the surface strength of the base paper. You may apply | coat the size liquid containing well-known water-soluble polymers, such as polyvinyl alcohol and polyacrylamide. In the sizing liquid used in this case, as auxiliaries, for example, styrene sizing agent, styrene-acrylate sizing agent, olefin sizing agent, surface sizing agent such as AKD, ASA, coloring dye, fluorescent dye, antifoaming agent May be used in combination. As an application method in the case of applying the sizing liquid, for example, a general application method such as a size press, a gate roll coater, a metering sizer, a rod coater, or an air knife coater can be used.
本発明において基紙の抄紙方法は特に限定されるものではなく、トップワイヤー等を含む長網抄紙機、オントップフォーマー、ギャップフォーマー、丸網抄紙機、長網抄紙機と丸網抄紙機とを併用したコンビネーション抄紙機、等で抄紙することができる。これらの中でも、ギャップフォーマーを用いる場合に本発明の構成は有利となる。ギャップフォーマーでの抄紙は、基紙の原材料が２枚のワイヤーに挟まれて走行して両側のワイヤーからほぼ均等に脱水が行われるという工程を含む。そのため、基紙の厚み方向の原材料の分布としては基紙の中心部分よりも表裏両面側に填料や微細繊維が集まり、その結果、基紙の両面ともに比較的平滑性が高くなる傾向にある。顔料塗工層中に着色顔料を含有させた場合には、前述の色スジが発生する問題があるが、この傾向は基紙の平滑性が高いほど発生しやすい傾向にある。本発明においては、顔料塗工層を着色染料で着色するため、ギャップフォーマーで基紙を抄紙した場合であっても、色スジの発生することのない印刷用塗工紙とすることができる。 In the present invention, the paper making method of the base paper is not particularly limited, and includes a long paper machine including a top wire, an on-top former, a gap former, a round paper machine, a long paper machine, and a round paper machine. Can be made with a combination paper machine, etc. Among these, the configuration of the present invention is advantageous when a gap former is used. Papermaking with a gap former includes a step in which the raw material of the base paper is sandwiched between two wires and dehydrated from the wires on both sides almost uniformly. Therefore, as the distribution of the raw materials in the thickness direction of the base paper, fillers and fine fibers gather on both the front and back sides of the center portion of the base paper, and as a result, both sides of the base paper tend to be relatively smooth. When a color pigment is contained in the pigment coating layer, there is a problem that the above-mentioned color streaks occur, but this tendency tends to occur as the smoothness of the base paper increases. In the present invention, since the pigment coating layer is colored with a coloring dye, even when the base paper is made with a gap former, it is possible to provide a printing coated paper that does not generate color streaks. .
本発明においては、印刷用塗工紙の坪量が７０ｇ／ｍ2以下であってもよい。本発明の印刷用塗工紙は、顔料塗工層の塗工量が１５ｇ／ｍ2以下と比較的少ないため、その坪量は主に基紙の坪量でコントロールすることとなる。基紙の坪量が低くなると、顔料塗工層に対する基紙の割合が少なくなり、不透明度が低下することも相まって、視感的な白色感のムラが目立ちやすい傾向となる。しかし、本発明においては、基紙に蛍光染料を含有させ、顔料塗工層が基紙の発する蛍光を遮り難い構成であることから、坪量が７０ｇ／ｍ2以下であるような坪量の比較的低い印刷用塗工紙であっても、色調ムラが目立ちにくい。ただし、基紙の坪量を低くしすぎると、基紙の単位面積あたりに含有させる蛍光染料の量が少なくなり、基紙に蛍光染料を含有させることによる白色度や視覚的な白さの向上の効果が薄れるおそれがある。そのため、印刷用塗工紙の坪量は４５〜７０ｇ／ｍ2であることが好ましく、５０〜６５ｇ／ｍ2であることがより好ましく、５５〜６３ｇ／ｍ2であることが更に好ましい。 In the present invention, the basis weight of the printing coated paper may be 70 g / m 2 or less. Since the coated paper for printing of the present invention has a relatively small amount of pigment coating layer of 15 g / m 2 or less, the basis weight is mainly controlled by the basis weight of the base paper. When the basis weight of the base paper is low, the ratio of the base paper to the pigment coating layer is reduced, and the opacity is lowered, so that uneven visual whiteness tends to be noticeable. However, in the present invention, the basis weight is such that the basis weight is 70 g / m 2 or less because the base paper contains a fluorescent dye and the pigment coating layer is difficult to block the fluorescence emitted by the base paper. Even with a relatively low printing paper, uneven color tone is not noticeable. However, if the basis weight of the base paper is too low, the amount of fluorescent dye contained per unit area of the base paper will be reduced, and the whiteness and visual whiteness will be improved by including the fluorescent dye in the base paper. The effect of may be diminished. Therefore, the basis weight of the coated printing paper is preferably from 45~70g / m 2, more preferably from 50~65g / m 2, and still more preferably from 55~63g / m 2.
本発明においては、印刷用塗工紙がカレンダーによる平滑化処理がなされたものであってもよい。ここで平滑化処理を行う方法としては、特に限定するものではなく、スーパーカレンダーやソフトニップカレンダー等の公知のカレンダーで行うことができる。 In the present invention, the coated paper for printing may have been subjected to a smoothing process using a calendar. The method for performing the smoothing process is not particularly limited, and a known calendar such as a super calender or a soft nip calender can be used.
カレンダーによる平滑化処理は、印刷用紙の平滑性や光沢性を向上させるために一般的に行われるものであるが、炭酸カルシウムを主成分とする顔料塗工層を設けた印刷用塗工紙の場合には、カレンダーでの平滑化処理を行うと不透明度が比較的低下しやすい傾向がある。これは、炭酸カルシウムを主成分とする顔料塗工層が、他の顔料を主成分とする塗工層に比べてカレンダーでの平滑化処理時に潰れやすいことが原因と考えられ、炭酸カルシウムを主成分とする顔料塗工層が潰れて薄くなることで顔料塗工層による基紙の隠蔽性が低下し、基紙の白色度が低ければ印刷用塗工紙の白色度も低下することとなる。 A smoothing process using a calendar is generally performed in order to improve the smoothness and glossiness of printing paper. In some cases, the opacity tends to be relatively low when the calendar is smoothed. This is thought to be due to the fact that the pigment coating layer containing calcium carbonate as a main component is more likely to be crushed during the smoothing treatment on the calendar than the coating layer containing other pigments as the main component. When the pigment coating layer as a component is crushed and thinned, the concealability of the base paper by the pigment coating layer decreases, and if the whiteness of the base paper is low, the whiteness of the coated paper for printing also decreases. .
しかしながら、本発明に係る印刷用塗工紙は、基紙に蛍光染料を含有させることで基紙の白色度と視覚的な白さを向上させており、これによりカレンダーによる平滑化処理を行って顔料塗工層が薄くなった場合であっても、基紙の発する蛍光により印刷用塗工紙としての白色度及び見た目の白さを維持できるものである。 However, the coated paper for printing according to the present invention improves the whiteness and visual whiteness of the base paper by adding a fluorescent dye to the base paper, thereby performing a smoothing process using a calendar. Even when the pigment coating layer becomes thin, the whiteness and apparent whiteness of the coated paper for printing can be maintained by the fluorescence emitted from the base paper.
すなわち、本発明に係る印刷用塗工紙によれば、ギャップフォーマー、ブレードコーター、ロッドコーター、カレンダーなどの機器を使用した場合でも色スジ等が発生しにくいため高い平滑性を付与することが可能となり、軽量でありながらも平滑性が高く、印刷光沢の高い写真画像等の印刷にも好適な印刷用塗工紙とすることができる。 That is, according to the coated paper for printing according to the present invention, even when using devices such as a gap former, a blade coater, a rod coater, and a calendar, it is possible to impart high smoothness because color streaks are not easily generated. Thus, it is possible to obtain a coated paper for printing suitable for printing a photographic image or the like that is lightweight but has high smoothness and high printing gloss.
次に、実施例を挙げて本発明をより具体的に説明するが、本発明はこれら実施例に限定されるものではない。また、例中の「部」、「％」は、特に断らない限りそれぞれ「質量部」、「質量％」を示す。なお、添加部数は、固形分換算の値である。 Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In the examples, “parts” and “%” represent “parts by mass” and “mass%”, respectively, unless otherwise specified. The number of added parts is a value in terms of solid content.
（実施例１）
＜基紙の形成＞
フリーネスをＣＳＦ４００ｍｌに調整した広葉樹さらしクラフトパルプ（ＬＢＫＰ）８５部と、フリーネスをＣＳＦ６００ｍｌに調整した針葉樹さらしクラフトパルプ（ＮＢＫＰ）１５部を水中に添加してパルプスラリーとし、該パルプスラリーに軽質炭酸カルシウム（ＴＰ１２１Ｓ：奥多摩工業社製）７部、青色染料（ダイレクトペーパーブルー４ＧＬ：日本化学工業所社製）０．０２部、蛍光染料（サンホワイトＢＵＬＨ：サンライズ社製）０．０２部、硫酸バンド１．０部、カチオン化澱粉（ケート３０８：日本ＮＳＣ社製）０．５部、歩留り剤（ハイホールダー２２０：栗田工業社製）０．０１部を配合して調製した紙料をギャップフォーマーを有する抄紙機にて抄紙し、坪量４５ｇ／ｍ2の基紙を得た。尚、基紙には酸化デンプン（王子エースＡ：王子コーンスターチ社製）８質量％濃度のサイズプレス液を基紙の両面に、片面あたりの塗布量が１ｇ／ｍ2となるようにゲートロールサイズプレスで塗布し、乾燥している。
＜塗工層の形成＞
無機顔料として重質炭酸カルシウム（カービタル９０：イメリス社製）１００部、接着剤としてスチレン−ブタジエン共重合ラテックス（０６１３：ＪＳＲ社製）８部及び燐酸エステル化澱粉（ＭＳ＃４６００：日本食品加工社製）３部、紫色染料（カヤフェクトバイオレットＰリキッド２００：日本化薬社製）０．０３５部を水中に添加して混合し、固形分濃度が６５％の塗工層用塗料を調製した。得られた塗工層用塗料を、ブレードコーターを用いて基紙の両面に片面当たり乾燥塗工量が１０ｇ／ｍ2となるように塗工及び乾燥した。次いでソフトニップカレンダーで８０ｋＮ／ｍ、温度８０℃で平坦化処理を行い、坪量６５ｇ／ｍ2の印刷用塗工紙を得た。
Example 1
<Formation of base paper>
85 parts of hardwood bleached kraft pulp (LBKP) with freeness adjusted to 400 ml of CSF and 15 parts of softwood bleached kraft pulp (NBKP) with freeness adjusted to 600 ml of CSF were added to water to form a pulp slurry, and light calcium carbonate ( TP121S: manufactured by Okutama Kogyo Co., Ltd.) 7 parts, blue dye (direct paper blue 4GL: manufactured by Nippon Chemical Industry Co., Ltd.) 0.02 part, fluorescent dye (Sun White BULH: manufactured by Sunrise Co., Ltd.) 0.02 part, sulfate band A stock prepared by blending 0 parts, 0.5 parts of cationized starch (Kate 308: manufactured by NSC Japan) and 0.01 parts of a retention agent (High Holder 220: manufactured by Kurita Kogyo Co., Ltd.) has a gap former. Paper making was performed using a paper machine to obtain a base paper having a basis weight of 45 g / m 2 . For the base paper, oxidized starch (Oji Ace A: manufactured by Oji Corn Starch Co., Ltd.) 8% by mass size press solution on both sides of the base paper, the gate roll size so that the coating amount per side is 1 g / m 2 It is applied with a press and dried.
<Formation of coating layer>
100 parts of heavy calcium carbonate (Carbital 90: manufactured by Imeris) as an inorganic pigment, 8 parts of styrene-butadiene copolymer latex (0613: manufactured by JSR) as an adhesive, and phosphate esterified starch (MS # 4600: Nippon Food Processing Co., Ltd.) 3 parts), 0.035 part of a purple dye (Kayafect Violet P Liquid 200: Nippon Kayaku Co., Ltd.) was added and mixed in water to prepare a coating layer coating having a solid content concentration of 65%. The obtained coating layer coating composition was applied and dried using a blade coater so that the dry coating amount per side was 10 g / m 2 on both sides of the base paper. Subsequently, a flattening process was performed with a soft nip calender at 80 kN / m and a temperature of 80 ° C. to obtain a coated paper for printing having a basis weight of 65 g / m 2 .
（実施例２）
塗工層用塗料に配合する無機顔料を重質炭酸カルシウム（カービタル９０：イメリス社製）９５部、及びカオリン（ハイドラスパース：米国ヒューバー社製）５部に変更した以外は実施例１と同様にして印刷用塗工紙を得た。
(Example 2)
Example 1 except that the inorganic pigment to be blended in the coating layer coating was changed to 95 parts of heavy calcium carbonate (Carbital 90: manufactured by Imeris) and 5 parts of kaolin (Hydra Sparse: manufactured by Huber, USA). Thus, a coated paper for printing was obtained.
（実施例３）
塗工層用塗料に配合する無機顔料を、重質炭酸カルシウム（カービタル９０：イメリス社製）９０部、及びカオリン（ハイドラスパース：米国ヒューバー社製）１０部に変更した以外は実施例１と同様にして印刷用塗工紙を得た。
(Example 3)
Example 1 except that the inorganic pigment blended in the coating layer coating material was changed to 90 parts of heavy calcium carbonate (Carbital 90: manufactured by Imeris) and 10 parts of kaolin (Hydra sparse: manufactured by Huber, USA). Thus, a coated paper for printing was obtained.
（実施例４）
塗工層用塗料に配合する紫色染料（カヤフェクトバイオレットＰリキッド２００：日本化薬社製）の配合量を０．０２５部に変更し、更に青色染料（カヤフェクトブルーＦリキッド：日本化薬社製）０．０１部を添加した以外は実施例１と同様にして印刷用塗工紙を得た。
Example 4
The amount of purple dye (Kayafect Violet P Liquid 200: manufactured by Nippon Kayaku Co., Ltd.) to be blended in the coating layer coating is changed to 0.025 parts, and further, the blue dye (Kayafect Blue F Liquid: Nippon Kayaku Co., Ltd.) is changed. (Product) A coated paper for printing was obtained in the same manner as in Example 1 except that 0.01 part was added.
（実施例５）
基紙に配合する蛍光染料（サンホワイトＢＵＬＨ：サンライズ社製）の配合量を０．０１部に変更した以外は実施例１と同様にして印刷用塗工紙を得た。
(Example 5)
A coated coated paper for printing was obtained in the same manner as in Example 1 except that the amount of the fluorescent dye (Sun White BULH: manufactured by Sunrise) blended in the base paper was changed to 0.01 part.
（実施例６）
基紙に配合する蛍光染料（サンホワイトＢＵＬＨ：サンライズ社製）の配合量を０．０２５部に変更した以外は実施例１と同様にして印刷用塗工紙を得た。
(Example 6)
A coated paper for printing was obtained in the same manner as in Example 1 except that the amount of the fluorescent dye (Sun White BULH: manufactured by Sunrise) blended in the base paper was changed to 0.025 parts.
（実施例７）
塗工層用塗料の塗工量を基紙の片面当たり乾燥塗工量で１２ｇ／ｍ2に変更した以外は実施例１と同様にして印刷用塗工紙を得た。
(Example 7)
A coated paper for printing was obtained in the same manner as in Example 1 except that the coating amount of the coating layer coating was changed to 12 g / m 2 in terms of the dry coating amount per side of the base paper.
（実施例８）
塗工層用塗料の塗工量を基紙の片面当たり乾燥塗工量で１５ｇ／ｍ2に変更した以外は実施例１と同様にして印刷用塗工紙を得た。
(Example 8)
A coated paper for printing was obtained in the same manner as in Example 1 except that the coating amount of the coating layer coating material was changed to 15 g / m 2 in terms of the dry coating amount per side of the base paper.
（実施例９）
塗工層用塗料の塗工量を基紙の片面当たり乾燥塗工量で６ｇ／ｍ2に変更した以外は実施例１と同様にして印刷用塗工紙を得た。
Example 9
A coated paper for printing was obtained in the same manner as in Example 1 except that the coating amount of the coating layer coating was changed to 6 g / m 2 in terms of the dry coating amount per side of the base paper.
（実施例１０）
塗工層用塗料の調整において、更に蛍光染料（サンホワイトＣＳＴ：サンライズ社製）０．６部を添加した以外は実施例１と同様にして印刷用塗工紙を得た。
(Example 10)
In the preparation of the coating layer coating material, a coated paper for printing was obtained in the same manner as in Example 1 except that 0.6 part of a fluorescent dye (Sun White CST: manufactured by Sunrise) was further added.
（実施例１１）
塗工層用塗料の調整において、更に蛍光染料（サンホワイトＣＳＴ：サンライズ社製）０．９部を添加した以外は実施例１と同様にして印刷用塗工紙を得た。
(Example 11)
A coated paper for printing was obtained in the same manner as in Example 1 except that 0.9 part of a fluorescent dye (Sun White CST: manufactured by Sunrise) was further added in the adjustment of the coating layer coating.
（実施例１２）
基紙の坪量を４３ｇ／ｍ2に変更した以外は実施例１と同様にして印刷用塗工紙を得た。得られた印刷用塗工紙の坪量は６３ｇ／ｍ2であった。
(Example 12)
A coated paper for printing was obtained in the same manner as in Example 1 except that the basis weight of the base paper was changed to 43 g / m 2 . The basis weight of the obtained coated paper for printing was 63 g / m 2 .
（実施例１３）
基紙の坪量を３５ｇ／ｍ2に変更した以外は実施例１と同様にして印刷用塗工紙を得た。得られた印刷用塗工紙の坪量は５５ｇ／ｍ2であった。
(Example 13)
A coated paper for printing was obtained in the same manner as in Example 1 except that the basis weight of the base paper was changed to 35 g / m 2 . The basis weight of the obtained coated paper for printing was 55 g / m 2 .
（実施例１４）
基紙の坪量を３０ｇ／ｍ2に変更した以外は実施例１と同様にして印刷用塗工紙を得た。得られた印刷用塗工紙の坪量は５０ｇ／ｍ2であった。
(Example 14)
A coated paper for printing was obtained in the same manner as in Example 1 except that the basis weight of the base paper was changed to 30 g / m 2 . The basis weight of the obtained coated paper for printing was 50 g / m 2 .
（実施例１５）
塗工層用塗料に配合する無機顔料を、重質炭酸カルシウム（カービタル９０：イメリス社製）９０部、及びカオリン（ハイドラスパース：米国ヒューバー社製）１０部に変更し、塗工層用塗料の塗工量を基紙の片面当たり乾燥塗工量で１５ｇ／ｍ2に変更し、基紙に配合する蛍光染料（サンホワイトＢＵＬＨ：サンライズ社製）の配合量を０．０１部に変更し、基紙の坪量を３０ｇ／ｍ2に変更した以外は実施例１と同様にして印刷用塗工紙を得た。得られた印刷用塗工紙の坪量は６０ｇ／ｍ2であった。
(Example 15)
The inorganic pigment blended in the coating layer coating was changed to 90 parts of heavy calcium carbonate (Carbital 90: manufactured by Imeris) and 10 parts of kaolin (Hydra Sparse: manufactured by Huber, USA). The coating amount was changed to 15 g / m 2 in terms of dry coating amount per side of the base paper, the blending amount of the fluorescent dye (Sun White BULH: manufactured by Sunrise) was blended to 0.01 parts, A coated paper for printing was obtained in the same manner as in Example 1 except that the basis weight of the base paper was changed to 30 g / m 2 . The basis weight of the obtained coated paper for printing was 60 g / m 2 .
（実施例１６）
ソフトニップカレンダーで平坦化処理を行わなかった以外は実施例１と同様にして印刷用塗工紙を得た。得られた印刷用塗工紙の坪量は６５ｇ／ｍ2であった。
(Example 16)
A coated paper for printing was obtained in the same manner as in Example 1 except that the flattening treatment was not performed with a soft nip calender. The basis weight of the obtained coated paper for printing was 65 g / m 2 .
（比較例１）
基紙に蛍光染料を添加しなかった以外は実施例１と同様にして印刷用塗工紙を得た。
(Comparative Example 1)
A coated paper for printing was obtained in the same manner as in Example 1 except that the fluorescent dye was not added to the base paper.
（比較例２）
塗工層用塗料の調整において、紫色染料（カヤフェクトバイオレットＰリキッド２００：日本化薬社製）を添加せず、かわりに紫色顔料（ＴＢ−１５１６：大日精化工業社製）０．０３５部を添加した以外は実施例１と同様にして印刷用塗工紙を得た。
(Comparative Example 2)
In the preparation of the coating layer paint, purple dye (Kayafect Violet P Liquid 200: manufactured by Nippon Kayaku Co., Ltd.) is not added, and instead a purple pigment (TB-1516: manufactured by Dainichi Seika Kogyo Co., Ltd.) 0.035 parts A coated paper for printing was obtained in the same manner as in Example 1 except that was added.
各実施例及び比較例における印刷用塗工紙の構成を図１に、物性及び評価結果を図２に、それぞれ示した。尚、図２中の物性の測定及び各評価結果については以下の方法で行った。 The configuration of the coated paper for printing in each example and comparative example is shown in FIG. 1, and the physical properties and evaluation results are shown in FIG. In addition, about the measurement of the physical property in FIG. 2, and each evaluation result, it carried out with the following method.
＜白色度＞
ＪＩＳ Ｐ ８１４８に準じて測定したものであり、本発明においては白色度８５％以上であることが好ましい。
<Whiteness>
It is measured according to JIS P 8148, and in the present invention, the whiteness is preferably 85% or more.
＜白色感＞
印刷用塗工紙表面の白色感を室内蛍光灯照明下で目視にて確認し、以下の４段階で評価した。
◎：とても白く、白色感が良好。
○：白く、白色感が良好。
△：ややくすんで見えるものの、白色感は良好で実用上問題ない。
×：くすんで見え、白色感が良好とはいえない。実用に供し得ない。
<Whiteness>
The whiteness of the surface of the coated paper for printing was visually confirmed under indoor fluorescent lamp illumination, and evaluated according to the following four levels.
A: Very white and good whiteness.
○: White and white feeling is good.
Δ: Although it looks somewhat dull, the white feeling is good and there is no practical problem.
X: It looks dull and the whiteness is not good. It cannot be put to practical use.
＜色調ムラ＞
印刷用塗工紙表面の発色の均一性を目視にて確認し、以下の２段階で評価した。
○：発色性が均一で、色調ムラがない。
×：やや発色性にバラツキがあり、色調ムラを感じる。実用に供し得ない。
<Color tone unevenness>
The uniformity of color development on the surface of the coated paper for printing was visually confirmed and evaluated in the following two stages.
○: The color developability is uniform and there is no color tone unevenness.
X: Slightly uneven in color developability and feels uneven color tone. It cannot be put to practical use.
＜基紙の色相＞
ＪＩＳ Ｐ ８１５０に準拠し、積分球分光光度計ＣＥ−７０００Ａ（Ｘ−Ｒｉｔｅ社製）にて紫外光を含む光源にて測定した。
<Hue of base paper>
In accordance with JIS P 8150, measurement was performed with an integrating sphere spectrophotometer CE-7000A (manufactured by X-Rite) using a light source including ultraviolet light.
図２の結果からも明らかなように、実施例１〜１６で得られた印刷用塗工紙は、白色度が高く、白色感も良好であり、色調ムラのない印刷用塗工紙であった。また、何れも色スジの発生がないものであった。 As is clear from the results of FIG. 2, the coated paper for printing obtained in Examples 1 to 16 has high whiteness, good whiteness, and is free from uneven color tone. It was. In addition, no color streaks were generated.
実施例５及び実施例１５で得られた印刷用塗工紙は、基紙への蛍光染料の配合量が比較的少なかったため、ややくすんで見えたが、白色感は良好であり実用上問題ないレベルであった。しかしながら、これ以上基紙への蛍光染料の配合量を少なくすると、白色感に劣る可能性があるため、基紙への蛍光染料の配合量は、基紙中のパルプ１００質量部に対して０．０１質量部以上が必要であると考えられる。 The printing coated papers obtained in Example 5 and Example 15 looked somewhat dull due to the relatively small amount of the fluorescent dye added to the base paper, but the whiteness was good and there was no practical problem. It was a level. However, if the amount of the fluorescent dye added to the base paper is further reduced, the whiteness may be inferior. Therefore, the amount of the fluorescent dye added to the base paper is 0 with respect to 100 parts by mass of the pulp in the base paper. .01 parts by mass or more is considered necessary.
これに対して比較例１で得られた印刷用塗工紙は、基紙に蛍光染料を配合しなかったため、白色度及び白色感に劣るものであった。 On the other hand, the coated paper for printing obtained in Comparative Example 1 was inferior in whiteness and whiteness because no fluorescent dye was blended in the base paper.
比較例２で得られた印刷用塗工紙は、顔料塗工層を着色染料ではなく着色顔料で着色したため、色調ムラが感じられるものであった。また、着色顔料を使用しているため、着色顔料の顔料塗工層用塗料の分散状態によっては、色スジの発生するおそれがあった。 In the coated paper for printing obtained in Comparative Example 2, since the pigment coating layer was colored with a colored pigment instead of a colored dye, color tone unevenness was felt. In addition, since colored pigments are used, there is a possibility that color streaks may occur depending on the dispersion state of the pigment for the pigment coating layer.
本発明の印刷用塗工紙によれば、顔料塗工層の塗工量が比較的少ない場合であっても高い白色度を有し、色調ムラが少なく色スジのない印刷用塗工紙を得ることができる。特に、視覚的に強い白さを有し、機器で測定する白色度よりも白さが際だって見え、また、特に低米坪品において、優れた視覚的白さを発揮するものである。 According to the printing coated paper of the present invention, a printing coated paper having high whiteness, little color unevenness and no color streaks even when the coating amount of the pigment coating layer is relatively small. Can be obtained. In particular, it has a visually strong whiteness, and the whiteness can be seen more clearly than the whiteness measured by an apparatus, and it exhibits excellent visual whiteness particularly in a low-US basis product.
また、本発明に係る顔料塗工層用塗工液によれば、ブレードコーターやロッドコーターを用いて顔料塗工層を設けた場合にもストリークや色スジが生じにくく、カレンダーによって平滑化処理を行っても白色度が低下しにくいことから、高い平滑度を有し印刷光沢の高い写真画像等の印刷にも好適な印刷用塗工紙が得られるものである。 Further, according to the coating liquid for a pigment coating layer according to the present invention, even when a pigment coating layer is provided using a blade coater or a rod coater, streaks and color streaks are unlikely to occur, and a smoothing process is performed by a calendar. Since the whiteness does not easily decrease even if the printing is performed, a coated paper for printing suitable for printing a photographic image having high smoothness and high printing gloss can be obtained.
Claims (8)
前記顔料塗工層に含まれる無機顔料は、全無機顔料のうち８０質量％以上が炭酸カルシウムであり、
前記顔料塗工層は、更に紫色染料及び／又は青色染料を含有し、
前記基紙には、パルプ１００質量部に対して０．０２〜２質量部の範囲で蛍光染料が含まれており、
前記顔料塗工層の塗工量が基紙の片面あたり１５ｇ／ｍ2以下、白色度が８５％以上であり、
前記顔料塗工層は、各面に単層で設けられることを特徴とする印刷用塗工紙。 A pigment coating layer containing an inorganic pigment and an adhesive is provided on both sides of a base paper mainly composed of pulp,
The inorganic pigment contained in the pigment coating layer is 80% by mass or more of calcium carbonate among all inorganic pigments,
The pigment coating layer further contains a purple dye and / or a blue dye,
The base paper contains a fluorescent dye in a range of 0.02 to 2 parts by mass with respect to 100 parts by mass of pulp,
The pigment coating layer of the coated amount is less per one side 15 g / m 2 base paper state, and are whiteness 85% or more,
The coated paper for printing , wherein the pigment coating layer is provided as a single layer on each surface .
無機顔料と、接着剤と、紫色染料及び／又は青色染料と、を含む顔料塗工層用塗料を調製するステップと、
前記基紙の両面に、基紙の片面あたり３〜１５ｇ／ｍ2（乾燥重量）の範囲で、ブレードコーター又はロッドコーターを用いて前記顔料塗工層用塗料を塗工して単層の顔料塗工層を設けるステップとを有し、
前記顔料塗工層に含まれる無機顔料は、全無機顔料のうち８０質量％以上が炭酸カルシウムであり、
前記基紙には、パルプ１００質量部に対して０．０２〜２質量部の範囲で蛍光染料が含まれており、
得られた印刷用塗工紙の白色度が８５％以上である、ことを特徴とする印刷用塗工紙の製造方法。 A base material is obtained by papermaking a paper stock prepared by blending pulp and fluorescent dye in the range of 0.01 to 2 parts by weight with respect to 100 parts by weight of pulp with a paper machine having a gap former. Steps,
Preparing a paint for a pigment coating layer comprising an inorganic pigment, an adhesive, and a purple dye and / or a blue dye;
A single-layer pigment by applying the pigment coating layer paint on both sides of the base paper in the range of 3 to 15 g / m 2 (dry weight) per side of the base paper using a blade coater or a rod coater. Providing a coating layer,
The inorganic pigment contained in the pigment coating layer is 80% by mass or more of calcium carbonate among all inorganic pigments,
The base paper contains a fluorescent dye in a range of 0.02 to 2 parts by mass with respect to 100 parts by mass of pulp,
The whiteness of the obtained coated paper for printing is 85% or more, The manufacturing method of the coated paper for printing characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013067124A JP6096026B2 (en) | 2013-03-27 | 2013-03-27 | Coated paper for printing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013067124A JP6096026B2 (en) | 2013-03-27 | 2013-03-27 | Coated paper for printing |
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| CN115341406A (en) * | 2022-09-02 | 2022-11-15 | 东莞建晖纸业有限公司 | White-bottom white coated paper back coating and preparation method thereof |
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| JPH0197299A (en) * | 1987-10-06 | 1989-04-14 | Mitsubishi Paper Mills Ltd | Production of base paper for lightweight coating |
| JP2754077B2 (en) * | 1990-04-09 | 1998-05-20 | 日本化薬株式会社 | Method for producing optical brightener composition and high whiteness coated paper |
| JP2004285552A (en) * | 2003-03-03 | 2004-10-14 | Oji Paper Co Ltd | Coated paper for printing |
| JP2005284214A (en) * | 2004-03-31 | 2005-10-13 | Mitsubishi Paper Mills Ltd | Wet electrophotographic recording sheet |
| JP2006214055A (en) * | 2005-02-07 | 2006-08-17 | Mitsubishi Paper Mills Ltd | Coated sheet |
| JP4802128B2 (en) * | 2007-03-16 | 2011-10-26 | 北越紀州製紙株式会社 | Method for producing coated paper |
| JP5073420B2 (en) * | 2007-08-30 | 2012-11-14 | 北越紀州製紙株式会社 | Method for producing coated paper |
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