JP2007051382A - Method for producing coated paper for printing - Google Patents

Method for producing coated paper for printing Download PDF

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JP2007051382A
JP2007051382A JP2005235583A JP2005235583A JP2007051382A JP 2007051382 A JP2007051382 A JP 2007051382A JP 2005235583 A JP2005235583 A JP 2005235583A JP 2005235583 A JP2005235583 A JP 2005235583A JP 2007051382 A JP2007051382 A JP 2007051382A
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calcium carbonate
printing
light calcium
paper
coated paper
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JP4802600B2 (en
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Yutaka Nuriki
豊 塗木
Masaru Nagahara
大 永原
Kazunari Soga
一成 曽我
Takashi Ochi
隆 越智
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Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
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Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing coated paper for printing excellent in whiteness, opacity, white paper gloss and print gloss and also improved in strike-through in printing operation, compared to conventional coated paper of equal coat pickup level. <P>SOLUTION: The method for producing the coated paper for printing comprises coating base paper with a coating liquid containing a pigment and an adhesive. In this method, the pigment comprises a precipitated calcium carbonate-silica composite which is obtained by mixing precipitated calcium carbonate and an aqueous metal silicate solution together and, at the boiling point of the mixture or lower, and adding a mineral acid or acid metal salt or mixture thereof to the above mixture; and the coating liquid contains 1-30 pts.wt. of the precipitated calcium carbonate-silica composite based on 100 pts.wt. of the total pigment. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、印刷用塗工紙に関し、特に優れた白紙外観と印刷適性を備えた塗工紙に関する。 The present invention relates to a coated paper for printing, and particularly to a coated paper having an excellent white paper appearance and printability.

近年、印刷物に対し、写真や図案を多用し、更にカラー化するなどにより、視覚的に内容を強力に伝達しようとする強い要望がある。
塗工紙の品質のうち、重要なものは、白色度、不透明度、白紙光沢度、印刷光沢度などである。白色度はコントラストに、不透明度は裏抜けに、光沢度は印刷物の高級感に関係し、かつこれらが全て良いバランスで満足されることが重要である。
また、原紙に塗工液を塗工する方法は後述するが、塗工液の粘度が高すぎる場合、原紙上に塗工液が均一に塗布するのが困難であるため、良好な白紙外観を得ることができない。この場合、塗工液濃度を希釈するなど、塗工液粘度を低減させる必要があるが、そうすると今度は、必要な塗工量が得られず、やはり良好な白紙外観を得ることができない。とりわけ昨今、厳しい経済状況のなか、生産性向上のため、塗工速度の向上が求められており、より一層、塗工液には、粘度など塗工適性も良好であることが求められる。
塗工用顔料として、一般的に軽質炭酸カルシウム、重質炭酸カルシウム、カオリン、タルク、シリカ、二酸化チタン等が使用されている。このうち、例えば、軽質炭酸カルシウムを用いた場合、塗工紙の白色度や不透明度等は高めとなるが、光沢度は低めとなる。また、シリカを用いた場合、光沢度や吸油性等は良好となるが、塗工液の粘度が高くなり、塗工適性が問題となる。一般的に、顔料の粒径が細かい方が、光沢発現性が高くなるため、目的の粒径となるよう、顔料の粉砕が行なわれる場合がある。しかし、一般的に粒径が細かい方が粘度も増加するため、シリカを含有する顔料を粉砕した場合、とりわけ粘度が問題となる。
In recent years, there has been a strong demand to strongly convey the contents visually by using a lot of photographs and designs and further colorizing the printed matter.
Among the coated paper qualities, important ones are whiteness, opacity, white paper gloss, and print gloss. It is important that the whiteness is related to the contrast, the opacity is related to the background, the glossiness is related to the high quality of the printed matter, and these are all satisfied with a good balance.
Although the method for applying the coating liquid to the base paper will be described later, it is difficult to uniformly apply the coating liquid on the base paper when the viscosity of the coating liquid is too high. Can't get. In this case, it is necessary to reduce the coating solution viscosity, for example, by diluting the coating solution concentration. However, in this case, a necessary coating amount cannot be obtained and a good white paper appearance cannot be obtained. Particularly in recent severe economic situations, an improvement in coating speed is required to improve productivity, and the coating liquid is also required to have good coating suitability such as viscosity.
In general, light calcium carbonate, heavy calcium carbonate, kaolin, talc, silica, titanium dioxide and the like are used as coating pigments. Among these, for example, when light calcium carbonate is used, the whiteness and opacity of the coated paper are increased, but the glossiness is lowered. Further, when silica is used, the glossiness and oil absorption are good, but the viscosity of the coating liquid becomes high and the coating suitability becomes a problem. In general, the finer the particle diameter of the pigment, the higher the gloss development. Therefore, the pigment may be pulverized to obtain the target particle diameter. However, in general, the smaller the particle size, the higher the viscosity. Therefore, when a pigment containing silica is pulverized, the viscosity becomes a problem.

炭酸カルシウムとシリカを混合して塗工顔料として使用することで、高い白紙光沢と優れた印刷適性を有するオフセット印刷用塗工紙を得る方法が知られている(特許文献1参照)。しかしこの場合、単純に混合しているだけであり、それぞれの欠点を改善することできず、また、シリカの配合部数が増加した場合、塗工液粘度が悪化し、塗工適性が悪くなるなど問題がある。また、合成炭酸カルシウム表面に合成シリカ微粒子を直接固着させることで、印刷適性、光学適性、強度特性に優れた塗工層を有する塗工紙を得る方法が知られている(特許文献2参照)。しかしながら、この場合、白紙光沢、印刷光沢、裏写りに劣る場合があった。
特開2003−253595号公報 特開2003−63821号公報
A method is known in which calcium carbonate and silica are mixed and used as a coating pigment to obtain a coated paper for offset printing having high white paper gloss and excellent printability (see Patent Document 1). However, in this case, they are simply mixed, and the respective drawbacks cannot be improved. Also, when the number of blended parts of silica increases, the viscosity of the coating solution deteriorates and the suitability of coating deteriorates. There's a problem. Further, a method for obtaining a coated paper having a coating layer excellent in printability, optical suitability, and strength properties by directly fixing synthetic silica fine particles on the surface of synthetic calcium carbonate is known (see Patent Document 2). . However, in this case, the glossiness of white paper, printing gloss, and show-through may be inferior.
JP 2003-253595 A JP 2003-63821 A

以上の状況に鑑み、本発明の課題は、塗工量が同レベルの従来の塗工紙に比べ、白色度、不透明度、白紙光沢度、印刷光沢度に優れ、印刷時の裏抜けも改善された印刷用塗工紙の製造方法を提供することにある。   In view of the above situation, the object of the present invention is superior in whiteness, opacity, white paper glossiness, and print glossiness compared to conventional coated paper with the same coating amount, and also improves back-through during printing. Another object of the present invention is to provide a method for producing a coated paper for printing.

本発明者等は、上記課題を解決するために鋭意検討した結果、原紙に、顔料と接着剤を含有する塗工液を塗工する印刷用塗工紙の製造方法において、顔料として、ケイ酸金属塩水溶液と軽質炭酸カルシウムを混合し、その沸点以下の温度で鉱酸、または、酸性金属塩あるいはこれらの混合物を添加してを添加して得られる軽質炭酸カルシム−シリカ複合物を、顔料100重量部当たり1〜30重量部含有する塗工液を原紙に塗工して製造することにより、本発明の課題を解決することを見出し、本発明を完成するに至った。本発明の軽質炭酸カルシウム−シリカ複合物は、粉砕処理することが好ましい。軽質炭酸カルシウム−シリカ複合物の製造に用いる軽質炭酸カルシウム粒子は、紡錘状の一次粒子が凝集して二次粒子を形成しているロゼッタ型カルサイト系軽質炭酸カルシウムであることが好ましい。   As a result of diligent studies to solve the above problems, the present inventors, as a pigment, in a method for producing a printing paper for coating a base paper with a coating liquid containing a pigment and an adhesive, A light calcium carbonate-silica composite obtained by mixing an aqueous metal salt solution and light calcium carbonate and adding a mineral acid, an acidic metal salt or a mixture thereof at a temperature below the boiling point is added to the pigment 100. The present inventors have found that the problems of the present invention can be solved by coating a base paper with a coating liquid containing 1 to 30 parts by weight per part by weight, and have completed the present invention. The light calcium carbonate-silica composite of the present invention is preferably pulverized. The light calcium carbonate particles used in the production of the light calcium carbonate-silica composite are preferably Rosetta-type calcite light calcium carbonate in which spindle-shaped primary particles are aggregated to form secondary particles.

本発明により、塗工量が同レベルの従来の塗工紙に比べ、白色度、不透明度、白紙光沢度、印刷光沢度も優れ、印刷時の裏抜けも改善されたバランスの良好な品質であり、更に塗工適性が良好な印刷用塗工紙を得ることができる。   Compared to conventional coated paper with the same coating amount, the present invention has excellent whiteness, opacity, white paper glossiness, printing glossiness, and improved balance of prints. In addition, it is possible to obtain a coated paper for printing having good coating suitability.

本発明においては、特定の軽質炭酸カルシウム−シリカ複合物を、顔料として用いることにより、白色度、不透明度、白紙光沢度、印刷光沢度も優れ、印刷時の裏抜けも改善され、塗工適性が良好な印刷用塗工紙が得られるものである。これは、本発明のように複合化させた場合、不透明性に優れた軽質炭酸カルシウムの周りに透明なシリカが被覆するため、粘度が上がりにくく、塗工適性が良好であり、内部の軽質炭酸カルシウムが持つ優れた白色性、不透明性を持ち、さらに、外側のシリカが持つ高吸油性、光沢発現性を併せ持つと考えられる。また、本発明の軽質炭酸カルシウム−シリカ複合物は、吸油性が高く、印刷時のインク吸収性に優れ、インクが塗工紙表面に保持されるため、印刷光沢性が高くなり、裏抜けもしにくくなると思われる。また、炭酸カルシウムとシリカを複合化せずに、単純に混合した場合は、品質的には、軽質炭酸カルシウム、シリカそれぞれの欠点を改善することはできず、またシリカが部分的に凝集し、シリカの持つ高粘性の影響で混合物の粘度も上がるため、塗工適性が問題となる。   In the present invention, by using a specific light calcium carbonate-silica composite as a pigment, whiteness, opacity, white paper glossiness, printing glossiness are excellent, and show-through during printing is improved, and coating suitability is improved. Is a good coated paper for printing. This is because, when compounded as in the present invention, transparent silica is coated around light calcium carbonate excellent in opacity, so the viscosity is difficult to increase, coating suitability is good, and the internal light carbonate It is thought that it has the excellent whiteness and opacity that calcium has, and also has the high oil absorption and glossiness that the outer silica has. Further, the light calcium carbonate-silica composite of the present invention has high oil absorption, excellent ink absorption during printing, and the ink is retained on the surface of the coated paper. It seems to be difficult. In addition, when calcium carbonate and silica are simply combined without complexing, the disadvantages of light calcium carbonate and silica cannot be improved in terms of quality, and silica partially aggregates, Since the viscosity of the mixture increases due to the high viscosity of silica, coating suitability becomes a problem.

本発明の塗工層中の顔料として使用される軽質炭酸カルシウム−シリカ複合物は、例えば軽質炭酸カルシウムとアルカリ性の珪酸金属塩水溶液とを混合した液に、その煮沸温度以下の温度で鉱酸を添加することにより、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複合粒子が得られ、また、液の最終pHを7〜9にすることにより、より効率的に得ることができる。このようにして得られた軽質炭酸カルシウム−シリカ複合物を顔料に含む塗工液は、固形分濃度が高くてもハーキュレス粘度が低く、吸油量も高めとなるのでより好ましい。また、これらの軽質炭酸カルシウム−シリカ複合物は、シリカの有する光沢度や吸油性等の優れた向上効果と軽質炭酸カルシウムの有する白色度や不透明度等向上効果を併せ持つ利点がある。   The light calcium carbonate-silica composite used as the pigment in the coating layer of the present invention is obtained by mixing mineral acid at a temperature equal to or lower than the boiling temperature of a mixture of light calcium carbonate and an alkaline metal silicate aqueous solution, for example. By adding, the light calcium carbonate composite particle which coat | covered the surface of the light calcium carbonate particle with the silica is obtained, and it can obtain more efficiently by making final pH of a liquid into 7-9. The coating liquid containing the light calcium carbonate-silica composite obtained in this way in the pigment is more preferable because the Hercules viscosity is low and the oil absorption is high even if the solid content concentration is high. In addition, these light calcium carbonate-silica composites have the advantage of combining the excellent improvement effects such as the glossiness and oil absorbency of silica and the whiteness and opacity improvement effects of light calcium carbonate.

上記した製造方法は、具体的には、まず、軽質炭酸カルシウムを水中に分散し、これに珪酸のアルカリ溶液(アルカリは、例えばナトリウム、カリウム)を加える。珪酸とアルカリのモル比は限定されないが、3号珪酸(SiO:Na2O=3:1〜3.4:1程度)が一般に入手しやすく、好適に利用できる。軽質炭酸カルシウムと、珪酸のアルカリ溶液との仕込質量比を調整することにより、上記固形分質量比(CaCO/SiO)を調整できる。本発明においては、塗工適性及び品質の点から、固形分重量比は、(CaCO/SiO)は、30/70〜70/30が好ましい。
次に、これらの混合物を攪拌、分散した後、鉱酸または酸性金属塩、あるいはこれらの混合物で中和反応させることで、軽質炭酸カルシウム−シリカ複合物を製造することができる。鉱酸は何でもよく、また、酸性金属塩も硫酸バンドや硫酸マグネシウムなど何でもよい。白紙光沢度をより向上させるためには、硫酸などの鉱酸のみではなく、硫酸バンドや硫酸マグネシウムのような酸性金属塩を含んでいることが好ましい。鉱酸または酸性金属塩水溶液あるいはこれらの混合物の添加は、上記混合物の煮沸点以下の温度で行い、軽質炭酸カルシウム粒子の表面に珪酸分を析出させて非晶質珪酸を形成被覆させ、軽質炭酸カルシウム−シリカ複合物を得る。この中和反応はpH=7〜9で終了させることが好ましい。
Specifically, in the production method described above, first, light calcium carbonate is dispersed in water, and an alkali solution of silicic acid (alkali is, for example, sodium or potassium) is added thereto. Although the molar ratio of silicic acid and alkali is not limited, No. 3 silicic acid (SiO 2 : Na 2 O = about 3: 1 to 3.4: 1) is generally easily available and can be suitably used. The solid content mass ratio (CaCO 3 / SiO 2 ) can be adjusted by adjusting the charge mass ratio between the light calcium carbonate and the alkali solution of silicic acid. In the present invention, from the viewpoint of coating suitability and quality, the solid content weight ratio (CaCO 3 / SiO 2 ) is preferably 30/70 to 70/30.
Next, after stirring and dispersing these mixtures, a light calcium carbonate-silica composite can be produced by neutralizing with a mineral acid or acidic metal salt or a mixture thereof. The mineral acid can be anything, and the acid metal salt can be anything such as a sulfate band or magnesium sulfate. In order to further improve the glossiness of the blank paper, it is preferable to contain not only a mineral acid such as sulfuric acid but also an acidic metal salt such as a sulfuric acid band or magnesium sulfate. Mineral acid or acidic metal salt aqueous solution or a mixture thereof is added at a temperature not higher than the boiling point of the above mixture, and silicic acid is deposited on the surface of light calcium carbonate particles to form amorphous silicic acid. A calcium-silica composite is obtained. This neutralization reaction is preferably terminated at pH = 7-9.

軽質炭酸カルシウム−シリカ複合物平均粒子径の調整は、必要に応じて中和反応時の熟成中の強攪拌や粉砕、あるいは、中和反応終了後のまたは反応終了後の固液分離したものを湿式粉砕機、乾燥した後に乾式粉砕機等を用いて粉砕して行うことができる。なお、熟成とは、中和の際に添加する酸の添加を一時中断し、攪拌のみを施して放置することをいう。本発明においては、反応終了時の軽質炭酸カルシウム−シリカ複合物を、湿式粉砕などの粉砕処理を行うことにより、
粒径が細かくなり、光沢発現性が良好となる。また、一般にシリカ系顔料の粉砕を行なうと、粘度が増加し、塗工適性の悪化が懸念される。しかし、本発明の軽質炭酸カルシウム−シリカ複合物では、内部に軽質炭酸カルシウムがあるためか、粉砕を行なっても粘度の増加はほぼ認められず、塗工適性も良好であった。
軽質炭酸カルシウム−シリカ複合物の平均粒子径は、白紙光沢度を向上させ、不透明度や塗工適性などその他の品質とのバランスを良好にする点から、10μm以下であることが好ましく、より好ましくは、0.1〜3.0μm、更に好ましくは、0.2〜1.5μmである。
Adjustment of the average particle size of the light calcium carbonate-silica composite may be carried out by vigorous stirring or pulverization during aging during the neutralization reaction, or solid-liquid separation after completion of the neutralization reaction or after completion of the reaction. It can be carried out by pulverization using a wet pulverizer, a dry pulverizer after drying. The aging means that the addition of the acid to be added at the time of neutralization is temporarily interrupted and left only after stirring. In the present invention, the light calcium carbonate-silica composite at the end of the reaction is subjected to a grinding treatment such as wet grinding,
The particle size becomes fine, and the glossiness is improved. In general, when a silica-based pigment is pulverized, the viscosity increases, and there is a concern that the coating suitability may deteriorate. However, in the light calcium carbonate-silica composite of the present invention, the increase in viscosity was hardly observed even when pulverized because of the light calcium carbonate inside, and the coating suitability was also good.
The average particle size of the light calcium carbonate-silica composite is preferably 10 μm or less, more preferably 10 μm or less from the viewpoint of improving white paper glossiness and improving the balance with other qualities such as opacity and coating suitability. Is 0.1 to 3.0 μm, more preferably 0.2 to 1.5 μm.

本発明においては、軽質炭酸カルシウム−シリカ複合物の吸油量が30〜300ml/100gの範囲であることが好ましい。吸油量が30ml/100g未満であれば、印刷時のインク吸収性が低く、印刷時の裏抜け性が低下し、300ml/100gを越えると、表面強度が低下し、印刷時に紙粉が堆積し、印刷作業性が低下し、また、印刷面感も悪下する。本発明においては、30〜200ml/100gが好ましく、より好ましくは50〜150ml/100gである。   In the present invention, the oil absorption of the light calcium carbonate-silica composite is preferably in the range of 30 to 300 ml / 100 g. If the oil absorption is less than 30 ml / 100 g, the ink absorbency during printing is low, and the penetration property during printing decreases. If it exceeds 300 ml / 100 g, the surface strength decreases and paper dust accumulates during printing. The printing workability is lowered, and the printing surface is also deteriorated. In this invention, 30-200 ml / 100g is preferable, More preferably, it is 50-150 ml / 100g.

軽質炭酸カルシウム−シリカ複合物の製造に用いられる軽質炭酸カルシウム(CaCO3)の結晶の形態(同質異像)は、カルサイト、アラゴナイトのいずれでもよい。上記軽質炭酸カルシウムの形状も、針状、柱状、紡錘状、球状、立方体状、ロゼッタ(rosette)型のいずれでもよい。本発明においては、軽質炭酸カルシウム−シリカ複合物の製造に用いる軽質炭酸カルシウム粒子が、紡錘状の一次粒子が凝集して二次粒子を形成しているロゼッタ型カルサイト系軽質炭酸カルシウムであることがより望ましい。軽カルの結晶形態はカルサイト、アラゴナイトのいずれでも良く、また形状についても針状、柱状、紡錘状、球状、立方体状、ロゼッタ形のいずれでも問題なく複合粒子化することができるが、この中でも特にロゼッタ型のカルサイト形状をもつ軽質炭酸カルシウムを用いた場合に、特に優れた吸油性、不透明度改善効果が高い顔料が得られる。このうち吸油性が高いと、印刷時のインク吸収性がよく、印刷時の裏抜けも向上する。また、塗工適性も良好なる。なお、ロゼッタ型とは、紡錘状の軽カル一次粒子がいがくり状に凝集した形態を指し、通常の軽質炭酸カルシウムより高い比表面積と吸油性を示す特徴がある。   The crystal form (homogeneous image) of light calcium carbonate (CaCO3) used for the production of the light calcium carbonate-silica composite may be either calcite or aragonite. The light calcium carbonate may have any of a needle shape, a column shape, a spindle shape, a spherical shape, a cubic shape, and a rosette type. In the present invention, the light calcium carbonate particles used in the production of the light calcium carbonate-silica composite are rosetta calcite light calcium carbonate in which spindle-shaped primary particles are aggregated to form secondary particles. Is more desirable. The crystal form of light calcite may be either calcite or aragonite, and the shape can be any of acicular, columnar, spindle, spherical, cubic, and rosetta forms without any problems, but among these, In particular, when light calcium carbonate having a rosetta-type calcite shape is used, a pigment having particularly excellent oil absorption and high opacity improvement effect can be obtained. Among these, when oil absorption is high, the ink absorbency at the time of printing is good and the show-through at the time of printing is also improved. Also, the coating suitability is improved. The Rosetta type refers to a form in which spindle-shaped light cal primary particles are aggregated in a corrugated shape, and is characterized by a higher specific surface area and oil absorbency than ordinary light calcium carbonate.

本発明で用いられる顔料は、上記軽質炭酸カルシウム−シリカ複合物の他に、他の顔料と併用しても良い。他の顔料に特に制限はなく、塗工紙用に従来から用いられている、カオリン、クレー、デラミネーテッドクレー、重質炭酸カルシウム、軽質炭酸カルシウム、タルク、二酸化チタン、硫酸バリウム、硫酸カルシウム、酸化亜鉛、ケイ酸、ケイ酸塩、コロイダルシリカ、サチンホワイトなどの無機顔料、プラスチックピグメントなどの有機顔料であり、これらの顔料は必要に応じて、軽質炭酸カルシウム−シリカ複合物と他の一種または他の二種以上と混合で使用することが出来る。なお、軽質炭酸カルシウム−シリカ複合物は、粉砕したものも同様に使用することができる。また、本発明においては軽質炭酸カルシウムー複合シリカ複合物の配合部数は、固形分で顔料100重量部当たり1〜30重量部含有し、好ましくは1〜25重量部、より好ましくは3〜20重量部である。1重量部未満であれば、顔料中の軽質炭酸カルシウムー複合シリカ複合物の割合が小さいため、その優れた効果が発現しにくく、また、30重量部を越えると、特に軽質炭酸カルシウムー複合シリカ複合物を粉砕した場合、塗工液粘性が増加しやすくなり、塗工適性に劣ってしまう。   The pigment used in the present invention may be used in combination with other pigments in addition to the light calcium carbonate-silica composite. Other pigments are not particularly limited, and are conventionally used for coated paper, kaolin, clay, delaminated clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, Inorganic pigments such as zinc oxide, silicic acid, silicate, colloidal silica, and satin white, and organic pigments such as plastic pigments, and these pigments may be light calcium carbonate-silica composite and other kind or Can be used in combination with two or more other types. In addition, what grind | pulverized the light calcium carbonate-silica composite can be used similarly. In the present invention, the light calcium carbonate-composite silica composite is blended in an amount of 1 to 30 parts by weight, preferably 1 to 25 parts by weight, more preferably 3 to 20 parts by weight, based on 100 parts by weight of the pigment. It is. If the amount is less than 1 part by weight, the ratio of the light calcium carbonate-composite silica composite in the pigment is small, so that the excellent effect thereof is difficult to be exhibited. When crushed, the viscosity of the coating solution tends to increase, resulting in poor coating suitability.

本発明において用いられる接着剤に特に制限は無く、塗工紙用に従来から用いられている、スチレン・ブタジエン系、スチレン・アクリル系、エチレン・酢酸ビニル系、ブタジエン・メチルメタクリレート系、酢酸ビニル・ブチルアクリレート系等の各種共重合およびポリビニルアルコール、無水マレイン酸共重合体、アクリル酸・メチルメタクリレート系共重合体等の合成系接着剤;カゼイン、大豆蛋白、合成蛋白等の蛋白質類;酸化澱粉、陽性澱粉、尿素燐酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉などのエーテル化澱粉、デキストリン等の澱粉類;カルボキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体等の通常の塗工紙用接着剤1種類以上を適宜選択して使用される。これらの接着剤は、印刷適性、塗工適性を良好にするために、顔料100重量部当たり5〜50重量部、より好ましくは10〜30重量部の範囲で使用される。また、必要に応じて、分散剤、増粘剤、保水剤、消泡剤、耐水化剤、着色剤等、通常の塗工紙用顔料に配合される各種助剤が適宜使用される。   The adhesive used in the present invention is not particularly limited, and is conventionally used for coated paper, styrene / butadiene, styrene / acrylic, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / Synthetic adhesives such as various copolymers such as butyl acrylate and polyvinyl alcohol, maleic anhydride copolymer, acrylic acid / methyl methacrylate copolymer; proteins such as casein, soy protein, synthetic protein; oxidized starch, 1 type of normal adhesive for coated paper such as positive starch, urea phosphated starch, etherified starch such as hydroxyethyl etherified starch, starch such as dextrin; cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose It is used by selecting the above as appropriate . These adhesives are used in an amount of 5 to 50 parts by weight, more preferably 10 to 30 parts by weight per 100 parts by weight of the pigment, in order to improve the printability and coating suitability. Moreover, various auxiliary | assistant mix | blended with the pigment for normal coated papers, such as a dispersing agent, a thickener, a water retention agent, an antifoamer, a water-resistant agent, and a coloring agent, are used suitably as needed.

原紙の抄紙方法について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マシン、丸網マシン、二者を併用したマシン、ヤンキードライヤーマシン等を用いて、酸性抄紙、中性抄紙、アルカリ性抄紙方式で抄紙した原紙のいずれであってもよく、使用されるパルプも、化学パルプに限らず、各種機械パルプや、新聞古紙から得られる回収古紙パルプを含む中質原紙も使用できる。また、サイズプレス、ビルブレード、ゲートロールコーター、プレメタリングサイズプレスを使用して、澱粉、ポリビニルアルコールなどを予備塗工した原紙や、顔料と接着剤を含む塗工液を一層以上予備塗工した塗工原紙も使用できる。塗工原紙としては、一般の塗工紙に用いられる坪量が30〜400g/m程度であり、好ましくは40〜200g/mを用いることができる。 There are no particular restrictions on the paper making method of the base paper, and long paper machines including top wires, round net machines, machines using the two together, Yankee dryer machines, etc., acid paper making, neutral paper making, alkaline Any of the base papers made by the paper making method may be used, and the pulp to be used is not limited to the chemical pulp, and various base pulps including various mechanical pulps and recovered waste paper pulp obtained from newspaper waste paper can be used. Also, use a size press, bill blade, gate roll coater, or pre-metering size press to pre-coat one or more base papers pre-coated with starch, polyvinyl alcohol, etc., or a coating solution containing pigments and adhesives. Coated base paper can also be used. The coating base paper, basis weight for use in coated paper generally is about 30 to 400 g / m 2, can be preferably used 40~200g / m 2.

本発明において、原紙に調製された塗工液を塗工する方法については、特に限定される物ではなく、公知の塗工装置を用いる事ができる。例えばブレードコーター、バーコーター、ロールコーター、エアナイフコーター、リバースロールコーター、カーテンコーター、サイズプレスコーター、ゲートロールコーター等が挙げられる。これらを用いて、一層もしくは二層以上を原紙上に片面あるいは両面塗工する。片面辺りの塗工量は3g/m〜25g/mであることが好ましく、より好ましくは4g/m〜15g/mである。片面当たりの塗工量が3g/mより少ない場合、十分な原紙被覆性が得られず、印刷適性に劣る傾向にある。また、印刷適性、塗工適性の点から、塗工液の固形分濃度は、40〜68重量%が好ましい。
In the present invention, the method for applying the coating liquid prepared on the base paper is not particularly limited, and a known coating apparatus can be used. Examples thereof include a blade coater, a bar coater, a roll coater, an air knife coater, a reverse roll coater, a curtain coater, a size press coater, and a gate roll coater. Using these, one or more layers are coated on one or both sides of the base paper. Preferably the coating weight of the single-sided Atari is 3g / m 2 ~25g / m 2 , more preferably from 4g / m 2 ~15g / m 2 . When the coating amount per side is less than 3 g / m 2 , sufficient base paper coverage cannot be obtained, and printability tends to be inferior. Further, from the viewpoint of printability and coating suitability, the solid content concentration of the coating solution is preferably 40 to 68% by weight.

湿潤塗工層を乾燥させる方法としては、例えば蒸気過熱シリンダ、加熱熱風エアドライヤ、ガスヒータードライヤ、電気ヒータードライヤ、赤外線ヒータードライヤ等各種の方法が単独もしくは併用して用いられる。   As a method for drying the wet coating layer, various methods such as a steam superheating cylinder, a heated hot air air dryer, a gas heater dryer, an electric heater dryer, and an infrared heater dryer are used alone or in combination.

上記方法にて製造された印刷用塗工紙は、塗工乾燥した後、平滑性や光沢性などを向上させるため、通常カレンダー処理される。本発明において、カレンダー処理は特に制限はなく、塗工紙用に従来から用いられるチルドカレンダー、ソフトニップカレンダーなどを使用して、場合によっては、カレンダーを使用しなくても構わない。しかし、硬度が高い弾性ロールおよび金属ロールを用いて高速仕上げすることが出来る100℃以上の高温ソフトニップカレンダーで加圧仕上げすることにより、一層本発明の効果、即ち光沢度など白紙面感や印刷面感が良好な塗工紙が得られ、より望ましい。   The coated paper for printing produced by the above method is usually calendered to improve smoothness and glossiness after coating and drying. In the present invention, the calendar process is not particularly limited, and a chilled calendar or a soft nip calendar conventionally used for coated paper may be used, and in some cases, the calendar may not be used. However, press finishing with a high-temperature soft nip calender at 100 ° C. or higher, which can be finished at high speed using elastic rolls and metal rolls with high hardness, can further improve the effect of the present invention, that is, glossy surface feel and printing. A coated paper having a good surface feeling can be obtained and is more desirable.

以下に実施例をあげて、本発明をより具体的に説明するが、勿論これらの例に限定されるものではない。なお、特に断らない限り、例中の部および%はそれぞれ重量部および重量%を示す。尚、得られた塗工紙について以下に示すような評価法に基づいて試験を行った。
〈評価方法〉
(1)吸油量:JIS K5101の方法による。
(2)粒径測定(レーザー法):試料スラリーを分散剤ヘキサメタリン酸ソーダ0.2重量%を添加した純水中で滴下混合して均一分散体とし、レーザー法粒径測定機(使用機器:マルバーン社製マスターサイザーS型)を使用して粒径を測定した。
(3)不透明度:JIS P 8138に基づいて測定した。
(4)白紙光沢度:JIS P 8142に基づいて測定し、評価は以下の基準で行った。(5)印刷光沢度:RI−II型印刷試験器を用い、東洋インキ製造株式会社製枚葉プロセスインキ(商品名TKハイエコー紅 MZ)を0.30cc使用して印刷を行い、一昼夜放置後、得られた印刷物の印刷光沢度をJIS P 8142に基づいて測定した。
(6)裏抜け:RI−II型印刷試験器を用い、東洋インキ製造株式会社製枚葉プロセスインキ(商品名TKハイエコー紅 MZ)を0.30cc使用して印刷を行い、一昼夜放置後、その裏面のインクの抜け具合を目視評価した。評価は以下の基準で行った。
Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In addition, unless otherwise indicated, the part and% in an example show a weight part and weight%, respectively. The obtained coated paper was tested based on the following evaluation method.
<Evaluation methods>
(1) Oil absorption: According to JIS K5101.
(2) Particle size measurement (laser method): The sample slurry was dropped and mixed in pure water to which 0.2% by weight of a sodium hexametaphosphate dispersant was added to form a uniform dispersion, and a laser particle size measuring device (equipment used: The particle size was measured using a Mastersizer S type manufactured by Malvern.
(3) Opacity: Measured based on JIS P 8138.
(4) Glossiness of blank paper: Measured based on JIS P 8142 and evaluated according to the following criteria. (5) Gloss of printing: Using RI-II type printing tester, printing was performed using 0.30cc of Toyo Ink Manufacturing Co., Ltd. sheet-fed process ink (trade name: TK High Echo Red MZ), The print glossiness of the obtained printed matter was measured based on JIS P8142.
(6) Back-through: Using a RI-II type printing tester, printing was performed using 0.30 cc of sheet-fed process ink (trade name TK High Echo Red MZ) manufactured by Toyo Ink Manufacturing Co., Ltd. The degree of ink removal on the back surface was visually evaluated. Evaluation was performed according to the following criteria.

◎:極めて良好,○:良好,△:やや劣る,×:劣る。
(7)塗工適性:ブレード塗工時のスタラクタイト、ブリーディングなどが発生しない状況を目視評価した。
A: Very good, B: Good, B: Slightly inferior, X: Inferior
(7) Coating suitability: A situation in which no stactite or bleeding occurred during blade coating was visually evaluated.

◎:極めて良好,○:良好,△:やや劣る,×:劣る。
[実施例1]
〔軽質炭酸カルシウム−シリカ複合物の製造〕
(製造例1:軽質炭酸カルシウムーシリカ複合物Aの調製)
反応容器中に市販ロゼッタ型軽質炭酸カルシウム(商品名 アルバカー5970 SMI社製)11重量部を水に分散し、ここにSiO2濃度18.0wt/wt%、Na2O濃度6.1wt/wt%のケイ酸ソーダ溶液を62重量部加えた後、水を加え、全量を220重量部とした。この混合スラリーをアジテータで十分に射しながら加熱し、85℃としたスラリーに、10%硫酸溶液を定量ポンプにより加えるが、この硫酸添加口付近が十分攪拌されるように、アジテータの攪拌羽根直下とした。このように添加された硫酸が十分に分散される条件のもと、温度一定で、硫酸添加後の最終pHは8.0、全硫酸添加時間は240分間となるように、一定速度で硫酸を添加した。このスラリーは100メッシュ節で粗粒分を分離した、ベルトフィルターでろ過し、さらに約10%に再分散し、平均粒径、手抄き分析用サンプルとした。吸油量、BET比表面積用サンプルはろ過後のサンプルをエタノール中に約10%となるよう再分散した後、ろ過、105℃の乾燥機にて乾燥を行い、粉体サンプルとした後に、測定を行ったところ、平均粒子径は3.4μm、吸油量159ml/100gであった。得られた軽質炭酸カルシウム−シリカ複合物を、横型湿式粉砕機にて処理することにより、平均粒子径が0.5μm、吸油量80ml/100gの炭酸カルシウム−複合シリカAを得た。
〔塗工液の調成〕軽質炭酸カルシウム−シリカ複合物A10部、市販カオリン(商品名:ジャパングロス、HUBER社製)75部、市販重質炭酸カルシウム(商品名:FMT−90、ファイマテック社製)15部からなる顔料100部に、分散剤としてポリアクリル酸ソーダ0.2部を添加してセリエミキサーで分散し、固形分濃度が70%の顔料スラリーを調成した。このようにして得られた顔料スラリーに、非増粘型のスチレン・ブタジエン共重合体ラテックス13部、およびヒドロキシエチルエーテル化澱粉6部を加え、さらに水を加えて濃度60%の塗工液を得た。
〔原紙〕填料として軽質炭酸カルシウムを紙重量あたり5重量%含有し、製紙用パルプとして、化学パルプと機械パルプをそれぞれ50重量%含有する坪量90g/m2の中質紙を塗工原紙として用いた。
〔塗工紙の製造〕上記の原紙に前述の塗工液を片面当たりの塗工量が14g/m2になるように、1100m/分の塗工速度のブレードコーターで両面塗工を行い、紙水分が5.5%になるように乾燥した。
〔カレンダー〕次いで、金属ロール温度65℃、線圧200kg/cmで、カレンダーニップ数4ニップの条件でスーパーカレンダー処理を行い印刷用塗工紙を得た。
[比較例1]
実施例1において、顔料として、市販軽質炭酸カルシウム(商品名:アルバカー5970、SMI社製)5部、市販シリカ(商品名:Tixolex17、ローディアジャパン社製)5部、市販カオリン75部、市販重質炭酸カルシウム15部に変更した以外は、実施例1と同様の方法で塗工紙を得た。
[比較例2]
実施例1において、顔料として、市販軽質炭酸カルシウム10部、市販カオリン75部、市販重質炭酸カルシウム15部に変更した以外は、実施例1と同様の方法で塗工紙を得た。
[比較例3]
実施例1において、顔料として、市販シリカ10部、市販カオリン75部、市販重質炭酸カルシウム15部に変更した以外は、実施例1と同様の方法で塗工紙を得た。
[比較例4]
実施例1において、顔料として、下記方法により作製した軽質炭酸カルシウム−シリカ複合物B10部、市販カオリン75部、市販重質炭酸カルシウム15部に変更した以外は、実施例1と同様の方法で塗工紙を得た。
A: Very good, B: Good, B: Slightly inferior, X: Inferior
[Example 1]
[Production of light calcium carbonate-silica composite]
(Production Example 1: Preparation of light calcium carbonate-silica composite A)
In a reaction vessel, 11 parts by weight of commercially available Rosetta-type light calcium carbonate (trade name: Albuquer 5970 SMI Co., Ltd.) was dispersed in water. After adding 62 parts by weight of the soda solution, water was added to make the total amount 220 parts by weight. The mixed slurry is heated while being sufficiently sprayed with an agitator, and a 10% sulfuric acid solution is added to the slurry at 85 ° C. with a metering pump. It was. Under such conditions that the added sulfuric acid is sufficiently dispersed, sulfuric acid is added at a constant rate so that the temperature is constant, the final pH after addition of sulfuric acid is 8.0, and the total sulfuric acid addition time is 240 minutes. Added. The slurry was separated into coarse particles at 100 mesh nodes, filtered through a belt filter, and redispersed to about 10% to obtain an average particle size and a sample for hand-sheet analysis. The sample for oil absorption and BET specific surface area was redispersed in ethanol so that the sample was about 10%, filtered, dried in a dryer at 105 ° C. to obtain a powder sample, and then measured. As a result, the average particle size was 3.4 μm and the oil absorption amount was 159 ml / 100 g. By treating the obtained light calcium carbonate-silica composite with a horizontal wet pulverizer, calcium carbonate-composite silica A having an average particle size of 0.5 μm and an oil absorption of 80 ml / 100 g was obtained.
[Preparation of coating solution] 10 parts of light calcium carbonate-silica composite A, 75 parts of commercially available kaolin (trade name: Japan Gloss, manufactured by HUBER), commercially available heavy calcium carbonate (trade name: FMT-90, Phimatech) (Manufactured) 0.2 parts of sodium polyacrylate as a dispersant was added to 100 parts of a pigment consisting of 15 parts and dispersed with a serie mixer to prepare a pigment slurry having a solid content concentration of 70%. To the pigment slurry thus obtained, 13 parts of non-thickening type styrene / butadiene copolymer latex and 6 parts of hydroxyethyl etherified starch are added, and water is further added to form a coating solution having a concentration of 60%. Obtained.
[Base paper] Medium weight paper containing 5% by weight of light calcium carbonate as filler and 50% by weight of chemical pulp and mechanical pulp each as paper pulp, and 90g / m2 medium weight paper as coated base paper It was.
[Manufacture of coated paper] Double-side coating is applied to the above base paper with a blade coater at a coating speed of 1100 m / min so that the coating amount per side of the above coating liquid is 14 g / m2. It was dried so that the water content was 5.5%.
[Calendar] Next, a super calendar process was performed under the conditions of a metal roll temperature of 65 ° C., a linear pressure of 200 kg / cm, and a calendar nip number of 4 nips to obtain a coated paper for printing.
[Comparative Example 1]
In Example 1, as a pigment, 5 parts of commercially available light calcium carbonate (trade name: Albuquer 5970, manufactured by SMI), 5 parts of commercially available silica (trade name: Tixolex 17, manufactured by Rhodia Japan), 75 parts of commercially available kaolin, commercially available heavy A coated paper was obtained in the same manner as in Example 1, except that the calcium carbonate was changed to 15 parts.
[Comparative Example 2]
In Example 1, a coated paper was obtained in the same manner as in Example 1 except that the pigment was changed to 10 parts of commercially available light calcium carbonate, 75 parts of commercially available kaolin, and 15 parts of commercially available heavy calcium carbonate.
[Comparative Example 3]
In Example 1, a coated paper was obtained in the same manner as in Example 1 except that the pigment was changed to 10 parts of commercially available silica, 75 parts of commercially available kaolin, and 15 parts of commercially available heavy calcium carbonate.
[Comparative Example 4]
In Example 1, the same method as in Example 1 was applied except that the pigment was changed to 10 parts of a light calcium carbonate-silica composite B produced by the following method, 75 parts of commercially available kaolin, and 15 parts of commercially available heavy calcium carbonate. Obtained paper.

軽質炭酸カルシウム−シリカ複合物Bの作製方法:工業用生石灰を用いた合成柱状炭酸カルシウムの生成工程の炭酸化反応過程において、コロイダルシリカ(日産化学工業社製、スノーテックス)を添加することで得た。なお、炭酸カルシウムとシリカの比率は重量比で90/10とした。この方法で得られた軽質炭酸カルシウム−シリカ複合物Bを走査型電子顕微鏡で観察したところ、長径1.5〜2.5μm、短径0.5〜0.7μmであった。また、吸油量は49mL/100gであった。   Preparation method of light calcium carbonate-silica composite B: obtained by adding colloidal silica (Nissan Chemical Industry Co., Ltd., Snowtex) in the carbonation reaction process of the synthetic columnar calcium carbonate production process using industrial lime. It was. The ratio of calcium carbonate to silica was 90/10 by weight. When the light calcium carbonate-silica composite B obtained by this method was observed with a scanning electron microscope, the major axis was 1.5 to 2.5 μm and the minor axis was 0.5 to 0.7 μm. The oil absorption was 49 mL / 100 g.

以上の結果を表1に示した。   The above results are shown in Table 1.

Figure 2007051382
表1から明らかなように実施例1は、白色度、不透明度、白紙光沢度、印刷光沢度に優れ、印刷時の裏抜けも改善され、塗工適性も良好な印刷用塗工紙を得ることができる。比較例1は白紙光沢度、印刷光沢度、塗工適性に劣る。比較例2は白紙光沢度、印刷光沢度、裏抜けに劣る。比較例3は白色度、不透明度、塗工適性に劣る。比較例4は白紙光沢度、印刷光沢度、裏抜けに劣る。

Figure 2007051382
As is clear from Table 1, Example 1 provides a coated paper for printing that is excellent in whiteness, opacity, blank paper gloss, and printing gloss, has improved back-through during printing, and has good coating suitability. be able to. Comparative Example 1 is inferior in white paper gloss, printing gloss, and coating suitability. Comparative Example 2 is inferior in white paper gloss, printing gloss, and back-through. Comparative Example 3 is inferior in whiteness, opacity, and coating suitability. Comparative Example 4 is inferior in white paper glossiness, printing glossiness, and back-through.

Claims (4)

原紙に、顔料と接着剤を含有する塗工液を塗工する印刷用塗工紙の製造方法において、顔料として、ケイ酸金属塩水溶液と軽質炭酸カルシウムを混合し、その沸点以下の温度で鉱酸、または、酸性金属塩あるいはこれらの混合物を添加して得られる軽質炭酸カルシウム−シリカ複合物を、顔料100重量部当たり1〜30重量部含有する塗工液を原紙に塗工することを特徴とする印刷用塗工紙の製造方法。 In a method of manufacturing a coated paper for printing, in which a coating liquid containing a pigment and an adhesive is applied to a base paper, a metallic silicate aqueous solution and light calcium carbonate are mixed as the pigment, and the mineral is heated at a temperature below its boiling point. The base paper is coated with a coating solution containing 1 to 30 parts by weight of a light calcium carbonate-silica composite obtained by adding an acid, an acidic metal salt or a mixture thereof per 100 parts by weight of the pigment. A method for producing coated paper for printing. 前記軽質炭酸カルシウム−シリカ複合物を粉砕処理することを特徴とする請求項1に記載の印刷用塗工紙の製造方法。 The method for producing a coated paper for printing according to claim 1, wherein the light calcium carbonate-silica composite is pulverized. 前記軽質炭酸カルシウム−シリカ複合物の製造に用いる軽質炭酸カルシウム粒子が、紡錘状の一次粒子が凝集して二次粒子を形成しているロゼッタ型カルサイト系軽質炭酸カルシウムであることを特徴とする、請求項1または2に記載の印刷用塗工紙の製造方法。 The light calcium carbonate particles used in the production of the light calcium carbonate-silica composite are rosetta calcite light calcium carbonate in which spindle-shaped primary particles are aggregated to form secondary particles. The manufacturing method of the coated paper for printing of Claim 1 or 2. 請求項1〜3のいずれかに記載の製造方法で製造された印刷用塗工紙。 The coated paper for printing manufactured with the manufacturing method in any one of Claims 1-3.
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CN115075049A (en) * 2022-07-08 2022-09-20 东莞建晖纸业有限公司 Coating for coating kraft liner board and preparation method thereof

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