JP2011219887A - Offset printing paper and method of manufacturing thereof - Google Patents

Offset printing paper and method of manufacturing thereof Download PDF

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JP2011219887A
JP2011219887A JP2010088305A JP2010088305A JP2011219887A JP 2011219887 A JP2011219887 A JP 2011219887A JP 2010088305 A JP2010088305 A JP 2010088305A JP 2010088305 A JP2010088305 A JP 2010088305A JP 2011219887 A JP2011219887 A JP 2011219887A
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paper
oil absorption
printing paper
pulp
pigment
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Hiroshi Sumida
浩 隅田
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Marusumi Paper Co Ltd
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Marusumi Paper Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a printing paper excellent in ink color development and offset printability suitable for fliers, and also light weighted, made by blending waste paper pulp in a high ration; and to provide a method of manufacturing the printing paper.SOLUTION: A printing paper for offset printing such as to meet the following requirements (1) to (11) is provided: (1) the whiteness is 60% or greater, (2) the opacity is 85% or greater, (3) the smoothness is 30 seconds or greater, and the smoothness difference between the obverse and the reverse surfaces is 5 seconds or less, (4) the oil absorption is 50 seconds or greater and the difference between the obverse and the reverse surfaces is 10 seconds or less, (5) the basis weight is 35 to 50 g/m, (6) 20 to 60 mass% of machine pulp is included within the total amount of pulp, (7) the ash content is 5.0 to 15%, (8) white carbon is contained in 0.50 to 2.5% in terms of ash, (9) the amount of oil absorption of the filler contained per cmpaper is 0.035 to 0.070 cc, (10) applying a starch-based surface treating agent on one side in an amount of 0.20 to 1.0 g/m, and (11) a surface treating agent comprising a pigment is applied and the amount of oil absorption of the pigment contained per cmpaper is 0.010 to 1.0 cc.

Description

本発明は、低坪量で、白色度が高く、印刷時のインキ発色性の良いオフセット印刷用紙及びその製造方法に関するものである。 The present invention relates to an offset printing paper having a low basis weight, a high whiteness, and a good ink coloring property during printing, and a method for producing the same.

紙は、新聞、書籍、雑誌、ポスター、カレンダー、パンフレット、包装紙等、ほとんどの場合印刷を施されて使用されており、印刷用紙の種類および特性は、印刷方式や用途によって様々である。一例を挙げると、オフセット印刷方式は、版面に親油性の画線部(印刷しようとする部分)と親水性の非画線部とを作り、湿し水と呼ばれる水を薄く塗り、次にインキを塗ると水をはじいた画線部にだけインキが付着するので、これをブランケットに転写し、さらにこのブランケットから紙にインキを転移させる方式である。湿し水を使用するため、水に濡れたときブランケットに付着して紙粉として取られないように、用紙には表面強度が重視される。また、グラビア印刷方式は、版上の凹部にインキを盛り紙に転写する方式であるため、版と紙とが均一に接し網点の抜け(スペックル)が起こらないように、表面に微小な凹凸がなく平滑性が高いことが要求される。 Paper is used in most cases, such as newspapers, books, magazines, posters, calendars, brochures, wrapping paper, etc., and the type and characteristics of the printing paper vary depending on the printing method and application. For example, the offset printing method creates an oleophilic image area (the area to be printed) and a hydrophilic non-image area on the printing plate, and thinly applies water called fountain solution, then ink. When ink is applied, the ink adheres only to the image area where water is repelled, and this is transferred to the blanket and the ink is transferred from the blanket to the paper. Since dampening water is used, the surface strength of the paper is important so that it will not adhere to the blanket and be removed as paper dust when wet. In addition, the gravure printing method is a method in which ink is transferred to the paper in the depressions on the plate, so that the plate and the paper are in uniform contact with each other so that there is no minute dot on the surface (speckle). It is required to have no irregularities and high smoothness.

スーパーやホームセンター等のチラシに使用される印刷用紙は、坪量49.0〜54.2g/mの微塗工紙が中心になっている。微塗工紙は顔料と接着剤を含む塗布液を塗布して、インキ着肉性を向上させたもので、一般の塗工紙に比べ少ない塗布量でチラシ用途に必要な印刷適性を付与したものである。このチラシに使用される印刷用紙は通常オフセット輪転印刷機により印刷されている。
昨今、低コスト化の動きが顕著になっており、用紙をグレードダウンする動きがある。具体的には、低坪量化、上質紙から中質紙や下級紙への変更、塗工紙から非塗工紙への変更が進んでいる。チラシ用途においても、微塗工紙から非塗工紙へ変更する動きがある。ここで非塗工紙とは、顔料を塗布していない印刷用紙を指し、日本製紙連合会「紙・板紙統計年報」の「紙・板紙の品種分類表」にある上級印刷紙、中級印刷紙、下級印刷紙等に分類されるものを指す。
ところが、非塗工紙は微塗工紙に比べて、インキ発色性が劣るため、チラシに必要とされる、消費者の目を引く美麗な印刷仕上がりは望めない。特に多色印刷のチラシに非塗工紙を用いると、微塗工紙を用いた場合と比べてインキ発色性が悪く、印刷仕上がりの差が顕著なものとなる。そこで、非塗工紙におけるインキ発色性の向上が課題となっている。
Printing paper used for flyers such as supermarkets and home centers is mainly fine-coated paper having a basis weight of 49.0 to 54.2 g / m 2 . The finely coated paper is a coating solution containing pigment and adhesive that improves ink fillability and provides the printability required for flyer applications with a smaller coating amount than ordinary coated paper. Is. Printing paper used for this flyer is usually printed by a rotary offset printing press.
In recent years, there has been a noticeable trend toward lowering costs, and there is a move to downgrade paper. Specifically, the basis weight has been lowered, the quality paper has been changed to medium quality paper and lower grade paper, and the coated paper has been changed to non-coated paper. In flyer applications, there is a movement to change from finely coated paper to non-coated paper. Here, uncoated paper refers to printing paper that has not been coated with pigments. Advanced printing paper and intermediate printing paper in the “Category Classification Table for Paper and Paperboard” of the Japan Paper Association “Paper and Paperboard Statistical Yearbook” This refers to paper classified as lower grade printing paper.
However, since non-coated paper is inferior in ink colorability to fine-coated paper, it cannot be expected to have a beautiful print finish that attracts consumers and is required for leaflets. In particular, when non-coated paper is used for a multi-colored flyer, the ink coloring property is worse than when finely coated paper is used, and the difference in printed finish becomes remarkable. Therefore, improvement of ink color development in non-coated paper has been a problem.

印刷用紙の一種に、スーパーカレンダー紙(通称SC紙:Super Calendered Paper)と呼ばれるものがあり、欧米では近年、雑誌や宣伝用のチラシ、カタログ等として、オフセット印刷あるいはグラビア印刷等によるカラー印刷に使用されている。このスーパーカレンダー紙は、通常の新聞用紙、印刷用紙等の非塗工紙と微塗工紙との中間に位置する非塗工紙であり、非塗工紙でありながら微塗工紙並みの光沢性や平滑性を付与した用紙である。 One type of printing paper is called super calendered paper (commonly called SC paper: Super Calendered Paper). In Europe and the United States, it has recently been used for color printing by offset printing or gravure printing as magazines, promotional flyers, catalogs, etc. Has been. This super calendar paper is a non-coated paper that is located between the non-coated paper such as normal newsprint and printing paper and the fine coated paper. Paper with gloss and smoothness.

スーパーカレンダー紙は、軽量でかつ光沢度を高くするために、線圧のかかった多数のロール間のニップを通過させており、紙が潰れることは避けられず高い不透明度と高いこし(剛度)を得ることは難しい。また、通常、主原料は不透明度が高くなりやすいグラウンドウッドパルプやサーモメカニカルパルプ等の機械パルプであり、古紙を高配合することは困難となっている。 Super calender paper passes through the nip between many rolls under linear pressure in order to be lightweight and have high gloss, and it is inevitable that the paper will be crushed. High opacity and high stiffness (rigidity) Hard to get. Moreover, usually, the main raw material is mechanical pulp such as groundwood pulp or thermomechanical pulp, which tends to have high opacity, and it is difficult to highly blend waste paper.

非塗工紙の白色度、不透明度、印刷適性向上を課題とした技術として、以下のような出願がある。
サーモメカニカルパルプを45質量%以上含有し、軽質炭酸カルシウムおよび軽質炭酸カルシウム−シリカ複合物を含有し灰分15%以上とするというもの。(特許文献1)紡錘凝集型軽質炭酸カルシウムまたは、針状凝集型軽質炭酸カルシウムを填料として配合し、6ニップ以上のソフトニップカレンダーで処理するというもの。(特許文献2)2ニップ以上のホットソフトニップカレンダーで処理する前および/または処理している間に金属ロール処理面の表面に水分を付与するというもの。(特許文献3)その他、印刷適性、及び製本適性に優れた低米坪印刷用紙として、摩擦係数、縮率、填料の吸油量、紙1gあたりに含まれる内添填料が持つ吸収量等を特定したものがある。(特許文献4)
しかし、いずれもインキ発色性について十分な検討はされていない。
There are the following applications as techniques for improving the whiteness, opacity, and printability of uncoated paper.
It contains 45% by mass or more of thermomechanical pulp, contains light calcium carbonate and light calcium carbonate-silica composite, and has an ash content of 15% or more. (Patent Document 1) Spindle-aggregated light calcium carbonate or needle-aggregated light calcium carbonate is blended as a filler and processed with a soft nip calender of 6 nips or more. (Patent Document 2) Water is applied to the surface of the metal roll treated surface before and / or during the treatment with a hot soft nip calender having two or more nips. (Patent Document 3) In addition, as a low-medium-price printing paper excellent in printability and bookbinding suitability, specify the friction coefficient, shrinkage, oil absorption amount of filler, absorption amount of internal filler contained in 1 g of paper, etc. There is what I did. (Patent Document 4)
However, none of the ink color development properties has been sufficiently studied.

最近は、いわゆるフリーペーパーやフリーマガジンと呼ばれる、広告収入を元に対象読者を性別や年齢層に応じて特定した無料の情報誌や各種広告の発行部数が増えており、このような、塗工紙ほど強い光沢や印刷効果は求めないものの、軽量でかつ従来の非塗工紙に比べて印刷品質に優れる用紙に対する要望は、今後ますます高まっていくと予想される。 Recently, so-called free papers and free magazines, the number of copies of free information magazines and various advertisements that specify the target readers based on advertising revenue according to gender and age group has increased. Although demands for gloss and printing effects are not as strong as paper, demand for paper that is lightweight and superior in print quality compared to conventional uncoated paper is expected to increase in the future.

特開2008−248451号公報JP 2008-248451 A 特開2008−274517号公報JP 2008-274517 A 特開2008−274518号公報JP 2008-274518 A 特許第4052083号公報Japanese Patent No. 4052083

本発明の課題は、古紙パルプを高配合した紙で、軽量であるにもかかわらず、インキ発色性に優れ、チラシ用途に適したオフセット印刷適性を有する印刷用紙及びその製造方法を提供することである。 An object of the present invention is to provide a printing paper having a high blend of waste paper pulp, which is lightweight but excellent in ink coloring property, and having offset printing suitability suitable for flyer use, and a method for producing the same. is there.

本発明者は、インキ発色性と、紙表層に現れている填料及び顔料によるインキ吸収能力の関係について検討した結果、印刷用紙の白色度、不透明度、平滑度、吸油度、坪量、機械パルプの含有率、灰分、使用する填料の種類と含有率、填料が持つ吸油量、表面処理剤の塗布量、表面処理剤に含まれる顔料の持つ吸油量を特定することにより、上記課題を解決できることを見出した。 As a result of examining the relationship between the ink coloring property and the ink absorption ability by the filler and pigment appearing on the paper surface layer, the present inventor has found that the whiteness, opacity, smoothness, oil absorption, basis weight, mechanical pulp of printing paper The above problems can be solved by specifying the content of ash, the ash content, the type and content of the filler used, the oil absorption amount of the filler, the coating amount of the surface treatment agent, and the oil absorption amount of the pigment contained in the surface treatment agent. I found.

請求項1に係る発明は、以下の(1)から(11)の条件を満たすオフセット印刷用紙である。
(1)白色度60%以上
(2)不透明度85%以上
(3)平滑度30秒以上、平滑度表裏差5秒以下
(4)吸油度50秒以上、吸油度表裏差10秒以下
(5)坪量35〜50g/m
(6)全パルプ中機械パルプを20〜60質量%含有
(7)灰分5.0〜15%
(8)ホワイトカーボンを灰分として0.50〜2.5%含有
(9)紙cmあたりに含まれる填料が持つ吸油量が0.035〜0.070cc
(10)澱粉系の表面処理剤を片面0.20〜1.0g/m塗布
(11)顔料を含む表面処理剤を塗布し、紙m当たり顔料の持つ吸油量が0.010〜1.0cc
請求項2に係る発明は、全パルプ中機械パルプを20〜60質量%含有するパルプスラリーを原料として抄紙するオフセット印刷用紙の製造方法であって、ホワイトカーボンを灰分として0.50〜2.5%含有させるとともに、ホワイトカーボンを除く填料を含有させて、灰分5.0〜15%、紙cmあたりに含まれる填料が持つ吸油量が0.035〜0.070cc、顔料を含む表面処理剤を塗布し、紙m当たり顔料の持つ吸油量が0.010〜1.0ccとなるように調整することを特徴とするオフセット印刷用紙の製造方法である。
The invention according to claim 1 is an offset printing paper that satisfies the following conditions (1) to (11).
(1) Whiteness 60% or more (2) Opacity 85% or more (3) Smoothness 30 seconds or more, smoothness front / back difference 5 seconds or less (4) Oil absorption 50 seconds or more, oil absorption front / back difference 10 seconds or less (5 ) Basis weight 35-50g / m 2
(6) Contains 20 to 60% by mass of mechanical pulp in all pulp (7) Ash content is 5.0 to 15%
(8) Containing 0.50 to 2.5% of white carbon as ash (9) Oil absorption amount of filler contained per cm 3 of paper is 0.035 to 0.070 cc
(10) Applying a starch-based surface treatment agent to 0.20 to 1.0 g / m 2 on one side (11) Applying a surface treatment agent containing a pigment, the oil absorption amount of the pigment per m 2 of paper is 0.010 to 1 .0cc
The invention according to claim 2 is a method for producing an offset printing paper, in which papermaking is performed using a pulp slurry containing 20 to 60% by mass of mechanical pulp in the total pulp as a raw material, and 0.50 to 2.5 using white carbon as ash. %, And a filler excluding white carbon, ash content of 5.0 to 15%, oil absorption amount of filler contained per cm 3 of paper is 0.035 to 0.070 cc, surface treatment agent containing pigment Is applied so that the oil absorption of the pigment per m 2 of paper is adjusted to 0.010 to 1.0 cc.

本発明のオフセット印刷用紙及びその製造方法によれば、低坪量で、白色度が高く、印刷時のインキ発色性の良いオフセット印刷用紙を提供することができる。 According to the offset printing paper and the method for producing the same of the present invention, it is possible to provide an offset printing paper having a low basis weight, a high whiteness, and a good ink coloring property during printing.

以下、本発明の実施の形態を説明する。
本発明の印刷用紙の製造には、ワイヤーパート、プレスパート、ドライヤーパート、リールパートの各工程からなる抄紙機を用いる。抄紙機の型式は特に限定はなく、長網抄紙機、ツインワイヤー抄紙機等を適宜使用できるが、オントップ型やギャップフォーマ型のツインワイヤー抄紙機が望ましく、特に両面から脱水するギャップフォーマー型抄紙機が望ましい。ギャップフォーマー型抄紙機で抄造することで、填料が紙の表層に分布し、印刷時にインキが表層の填料に保持され紙層内部への浸透が抑えられるので、インキ発色性が良くなる。長網抄紙機の場合には、パルプ繊維や填料の表裏差が出るために、印刷適性の表裏差が発生しやすい。
Embodiments of the present invention will be described below.
For the production of the printing paper of the present invention, a paper machine comprising each process of a wire part, a press part, a dryer part, and a reel part is used. The type of the paper machine is not particularly limited, and a long net paper machine, a twin wire paper machine, etc. can be used as appropriate, but an on-top type or a gap former type twin wire paper machine is desirable, especially a gap former type that dehydrates from both sides. A paper machine is preferred. By making paper with a gap former type paper machine, the filler is distributed on the surface layer of the paper, and the ink is held by the surface layer filler during printing and the penetration into the inside of the paper layer is suppressed, so that the ink coloring property is improved. In the case of a long net paper machine, there is a difference in the front and back of pulp fibers and fillers, so that a difference in front and back in printability tends to occur.

本発明の印刷用紙は、原料パルプとして、クラフトパルプ、古紙パルプ、機械パルプ等が使用できる。クラフトパルプとしては、針葉樹晒クラフトパルプ(NBKP)、広葉樹晒クラフトパルプ(LBKP)等が使用できる。また、古紙パルプとしては、新聞古紙脱墨パルプ、上質古紙脱墨パルプ等の古紙脱墨パルプ(DIP)が使用できる。機械パルプとしては、ストーングラウンドパルプ(SGP)、加圧ストーングランドパルプ(PGP)、リファイナーグランドパルプ(RGP)、サーモメカニカルパルプ(TMP)、ケミサーモメカニカルパルプ(CTMP)等を使用することができる。 The printing paper of the present invention can use kraft pulp, waste paper pulp, mechanical pulp, etc. as raw pulp. As kraft pulp, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP) and the like can be used. In addition, as waste paper pulp, waste paper deinking pulp (DIP) such as newspaper waste paper deinking pulp and high-quality waste paper deinking pulp can be used. As the mechanical pulp, stone ground pulp (SGP), pressurized stone ground pulp (PGP), refiner ground pulp (RGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), or the like can be used.

本発明の印刷用紙は、全パルプ中機械パルプを20〜60質量%含有している。20〜60質量%の含有率とすることで、嵩高さを得ることができ、低坪量でも剛度を高くすることが出来るとともに高い不透明度を得ることができる。配合するフレッシュな機械パルプのカナダ標準ろ水度(CSF)は80〜150mlに調整されていることが好ましい。ろ水度が80mlより低いと高い剛度が得られず、150mlより高いと結束繊維が多くなり、インキ着肉性が劣ることになる。
また、本発明の印刷用紙は、古紙パルプを含有していることが好ましく、その配合率は高いほうが良いが、印刷適性、剛度を考慮すると20〜60質量%とするのが好ましい。
印刷用紙に含まれる機械パルプの含有率は、機械パルプの配合率とDIPの配合率を調整することで、前記範囲内におさめることができる。DIPは新聞古紙、雑誌古紙、上質古紙等の古紙から製造されるため、NBKP、LBKP等の化学パルプや前記記載の機械パルプの各パルプが混在している。しかし、使用する古紙の種類を一定とすれば、DIPに含まれる機械パルプの含有率も一定となり、DIPを配合しても、印刷用紙全体に含まれる機械パルプの質量比率の予測・調整は可能である。
The printing paper of the present invention contains 20 to 60% by mass of mechanical pulp in the total pulp. By setting the content to 20 to 60% by mass, bulkiness can be obtained, and even at low basis weight, the rigidity can be increased and high opacity can be obtained. The Canadian standard freeness (CSF) of the fresh mechanical pulp to be blended is preferably adjusted to 80 to 150 ml. When the freeness is lower than 80 ml, high rigidity cannot be obtained, and when the freeness is higher than 150 ml, the number of binding fibers increases and the ink deposition property is inferior.
The printing paper of the present invention preferably contains waste paper pulp, and the blending ratio is preferably high, but it is preferably 20 to 60% by mass in consideration of printability and rigidity.
The content rate of the mechanical pulp contained in the printing paper can be kept within the above range by adjusting the mixing rate of mechanical pulp and the mixing rate of DIP. Since DIP is manufactured from waste paper such as newspaper waste, magazine waste paper, and high-quality waste paper, chemical pulps such as NBKP and LBKP and mechanical pulps described above are mixed. However, if the type of used paper is constant, the content of mechanical pulp contained in DIP will be constant, and even if DIP is blended, the mass ratio of mechanical pulp contained in the entire printing paper can be predicted and adjusted. It is.

本発明の印刷用紙には、インキ発色性、インキ着肉性、不透明度、白色度向上を目的に填料を添加している。特に吸油性の高いホワイトカーボンを灰分として0.50〜2.5%含むように添加している。ホワイトカーボンの含有率が0.50%より低いと、後述する紙cmあたりに含まれる填料が持つ吸油量を特定範囲にするには、吸油量の低い填料の含有率を高くする必要が生じ、この場合はパイリングの問題を起こしやすい。また、ホワイトカーボンの含有率が2.5%より高いと、見掛け比重の小さいホワイトカーボンは繊維間結合を弱くする傾向が強いので、この場合もパイリングの問題を起こしやすい。
ホワイトカーボン以外の填料の種類は特に限定されず、一般に印刷用紙に使用されている填料を使用することができる。具体的には、炭酸カルシウム、二酸化チタン、タルク、クレー、シリカ等の無機填料やプラスチックピグメント等を使用することができる。
本発明の印刷用紙の灰分(JISP8251)としては5.0〜15%とするのが好ましい。灰分が5.0%より低いと不透明度や白色度が不足し、15%より高いとパイリングの発生が顕著となる。
In the printing paper of the present invention, a filler is added for the purpose of improving the ink coloring property, the ink setting property, the opacity and the whiteness. In particular, white carbon having high oil absorption is added so as to contain 0.50 to 2.5% as ash. When the white carbon content is lower than 0.50%, it is necessary to increase the content of the filler having a low oil absorption amount in order to set the oil absorption amount of the filler contained in the paper cm 3 described later to a specific range. In this case, it is easy to cause piling problems. Further, when the white carbon content is higher than 2.5%, white carbon having a small apparent specific gravity tends to weaken the bond between fibers, and in this case as well, it tends to cause a problem of piling.
The type of filler other than white carbon is not particularly limited, and fillers generally used for printing paper can be used. Specifically, inorganic fillers such as calcium carbonate, titanium dioxide, talc, clay and silica, plastic pigments, and the like can be used.
The ash content (JISP8251) of the printing paper of the present invention is preferably 5.0 to 15%. When the ash content is lower than 5.0%, the opacity and whiteness are insufficient, and when the ash content is higher than 15%, the occurrence of piling becomes remarkable.

そして、ホワイトカーボンとその他の填料を含有させることにより、紙cmあたりに含まれる填料が持つ吸油量(JISK5101−13−2:2004煮あまに油法による)が0.035〜0.070ccとなるようにしている。このような範囲にすることで、填料と接触したインキが紙表層に存在する填料にすみやかに吸収され、紙表層に留まることから、インキ発色性が良好となる。紙cmあたりに含まれる填料が持つ吸油量が0.035ccより小さいと、インキが紙表層に存在する填料による吸収では不十分で、紙層内部に浸透するので、インキ発色性が悪くなる。紙cmあたりに含まれる填料が持つ吸油量が0.070ccより大きくしても、インキ発色性は大きく向上せず、次のような弊害がある。
すなわち、紙cmあたりに含まれる填料が持つ吸油量を大きくするには、吸油量の小さい填料の含有率を高くするか、吸油量の大きい填料を使用する必要が生じる。前者の場合は填料の存在により繊維間結合が少なくなり、パイリングの問題を起こしやすくなる。後者の場合は吸油量の大きい填料は見掛け比重が小さく、繊維間結合を弱くする傾向が強いので、比較的低い含有率でもパイリングの問題を起こしやすくなる。
And by containing white carbon and other fillers, the oil absorption amount (according to JISK5101-13-2: 2004 boiled sea urchin oil method) possessed by the filler contained in the paper cm 3 is 0.035 to 0.070 cc. It is trying to become. By setting it as such a range, the ink which contacted with the filler is immediately absorbed by the filler which exists in the paper surface layer, and stays in the paper surface layer, Therefore The ink color development property becomes favorable. When the oil absorption amount of the filler contained per cm 3 of paper is smaller than 0.035 cc, the ink is not sufficiently absorbed by the filler present in the paper surface layer, and the ink penetrates into the paper layer, resulting in poor ink color development. Even if the oil absorption amount of the filler contained per cm 3 of paper is larger than 0.070 cc, the ink coloring property is not greatly improved, and there are the following problems.
That is, in order to increase the oil absorption amount of the filler contained per paper cm 3, it is necessary to increase the content of the filler having a small oil absorption amount or to use a filler having a large oil absorption amount. In the former case, the presence of the filler reduces the fiber-to-fiber bond, and tends to cause a problem of piling. In the latter case, a filler having a large oil absorption has a small apparent specific gravity and a strong tendency to weaken the bond between fibers, so that it is likely to cause a problem of a pile even at a relatively low content.

本発明で、紙cmあたりに含まれる填料が持つ吸油量を特定した理由は、この値が紙表層に現れている填料によるインキ吸収能力の指標となっており、紙の単位体積あたりとすることで、坪量に依存することなく、インキ吸収能力を表わすことができるためである。単位面積あたりとしてもよいが、この場合は、坪量による換算が必要となる。
一般の塗工紙の場合のインキ発色性の良否は、主に塗布層のインキ吸収能力によるが、後述するように本発明の印刷用紙は表面処理剤の塗布量が少ないので、紙表層の填料によるインキ吸収能力に大きく依存していると考えられる。
In the present invention, the reason why the oil absorption amount of the filler contained in the paper cm 3 is specified is that this value is an index of the ink absorption capacity by the filler appearing on the paper surface layer, and is per unit volume of the paper. This is because the ink absorption ability can be expressed without depending on the basis weight. Although it may be per unit area, in this case, conversion by basis weight is required.
The quality of ink color development in the case of general coated paper mainly depends on the ink absorption ability of the coating layer, but as will be described later, the printing paper of the present invention has a small coating amount of the surface treatment agent. It is thought that it greatly depends on the ink absorption ability.

本発明のオフセット印刷用紙では、原料パルプに硫酸バンド、サイズ剤、嵩向上剤、紙力増強剤等を添加することができる。サイズ剤としては、ロジン系サイズ剤、アルキルケテンダイマー、アルケニル無水琥珀酸等のサイズ剤が使用できる。紙力増強剤としては、カチオン澱粉、ポリアクリルアミド系樹脂等が使用できる。その他、必要に応じ、湿潤紙力増強剤、スライムコントロール剤、ピッチコントロール剤、消泡剤、染料等の添加剤も使用することができる。 In the offset printing paper of the present invention, a sulfuric acid band, a sizing agent, a bulk improver, a paper strength enhancer, and the like can be added to the raw material pulp. As the sizing agent, a sizing agent such as rosin sizing agent, alkyl ketene dimer, alkenyl succinic anhydride can be used. As the paper strength enhancer, cationic starch, polyacrylamide resin and the like can be used. In addition, additives such as a wet paper strength enhancer, a slime control agent, a pitch control agent, an antifoaming agent, and a dye can be used as necessary.

本発明のオフセット印刷用紙では、前述した原紙の表裏両面に顔料と接着剤を含む表面処理剤を塗布し、片面の紙mあたり顔料の持つ吸油量{(顔料の吸油量[cc/100g]/100)×(顔料の片面塗布量[g/m])}が0.010〜1.0ccとなるようにしている。好ましくは、紙mあたり顔料の持つ吸油量は0.010〜0.50ccである。この際、吸油量が40〜120cc/100gの顔料を使用するのが好ましい。顔料の吸油量が120cc/100gより大きいと、接着剤を吸収して、パイリングの問題を起こしやすい。40cc/100gより小さいと、インキ発色性向上の効果が低い。使用する吸油量が40〜120cc/100gの顔料としては、カオリン、焼成カオリン、軽質炭酸カルシウム、亜鉛華などが挙げられる。このなかで、カオリン、焼成カオリン、軽質炭酸カルシウムを使用するのが、パイリング防止と入手が容易な点で好ましい。 In the offset printing paper of the present invention, a surface treatment agent containing a pigment and an adhesive is applied to both the front and back surfaces of the base paper, and the oil absorption amount {(pigment oil absorption amount [cc / 100 g] per m 2 of one side of the paper) / 100) × (one-side coating amount of pigment [g / m 2 ])} is set to 0.010 to 1.0 cc. Preferably, the oil absorption amount of the pigment per m 2 of paper is 0.010 to 0.50 cc. At this time, it is preferable to use a pigment having an oil absorption of 40 to 120 cc / 100 g. When the oil absorption amount of the pigment is larger than 120 cc / 100 g, the adhesive is absorbed, and the problem of piling tends to occur. If it is less than 40 cc / 100 g, the effect of improving the ink coloring property is low. Examples of the pigment having an oil absorption of 40 to 120 cc / 100 g include kaolin, calcined kaolin, light calcium carbonate, and zinc white. Of these, use of kaolin, calcined kaolin, and light calcium carbonate is preferred in terms of prevention of piling and easy availability.

紙mあたり顔料の持つ吸油量が0.010ccより小さいとインキ吸収性が不足し、インキ発色性が悪くなる。紙mあたり顔料の持つ吸油量が1.0ccより大きくするには、吸油量の高い顔料を使用するか、顔料の塗布量を多くする必要が生じ、このようにするといずれもパイリングの問題を起こしやすい。 If the oil absorption amount of the pigment per m 2 of paper is less than 0.010 cc, the ink absorptivity is insufficient and the ink coloring property is deteriorated. In order for the oil absorption amount of the pigment per m 2 of paper to be larger than 1.0 cc, it is necessary to use a pigment with a high oil absorption amount or to increase the coating amount of the pigment. Easy to wake up.

すなわち、紙面に印刷されたインキは、原紙表面に塗布した顔料によって吸収されるが、一部は顔料に吸収されず、原紙層に浸透したインキはパルプ繊維と吸油性のある填料に吸収されることにより紙に定着する。このように、紙cmあたり填料の持つ吸油量と、紙mあたり顔料の持つ吸油量を特定することで、低坪量でかつ少ない塗布量の印刷用紙でも、高いインキ発色性を得ることができる。 That is, the ink printed on the paper surface is absorbed by the pigment applied to the surface of the base paper, but a part is not absorbed by the pigment, and the ink that has penetrated the base paper layer is absorbed by the pulp fiber and the oil-absorbing filler. To fix on paper. Thus, by specifying the oil absorption amount of the filler per cm 3 paper and the oil absorption amount of the pigment per paper m 2 , high ink color development can be obtained even on printing paper with a low basis weight and a small coating amount. Can do.

本発明のオフセット印刷用紙では、顔料の塗布量は片面あたり0.010〜1.0g/mとするのが好ましく、0.010〜0.50g/mとするのがさらに好ましい。顔料の塗布量が片面あたり0.010g/mより少ないと、インキ吸収性が不足し、顔料を塗布してもインキ発色性の向上効果が認められない。顔料の塗布量が片面あたり1.0g/mより多いと、パイリングの問題を起こす。 In the offset printing paper of the present invention, the pigment coating amount is preferably 0.010 to 1.0 g / m 2 , more preferably 0.010 to 0.50 g / m 2 per side. If the coating amount of the pigment is less than 0.010 g / m 2 per side, the ink absorbability is insufficient, and even if the pigment is applied, the effect of improving the ink coloring property is not recognized. If the coating amount of the pigment is more than 1.0 g / m 2 per side, it causes a problem of piling.

本発明では表面処理剤に前記顔料とともに、接着剤を、顔料の接着能を向上させパイリングなどの表面強度に纏わるトラブルを回避するために配合する。表面強度と不透明度の両者を高めるための接着剤としては、澱粉類を含むことが好ましい。これらの接着剤は顔料との相溶性が良好で、塗布時に凝集などを起こし難いため、特に好ましく用いられる。 In the present invention, an adhesive is added to the surface treatment agent together with the pigment in order to improve the adhesion of the pigment and avoid troubles related to surface strength such as piling. As an adhesive for increasing both surface strength and opacity, it is preferable to include starches. These adhesives are particularly preferably used because they have good compatibility with pigments and hardly cause aggregation during coating.

澱粉類は、親水性である繊維との接着能力が高く、塗布量が少ない場合において紙表面から脱落し易い微細繊維なども強力に接着するため好ましい。前記澱粉類としては、酵素変性澱粉、酸化澱粉、エーテル化澱粉、エステル化澱粉、カチオン化澱粉、疎水化澱粉などが例示される。なお、カルボキシメチルセルロース、メチルセルロース、ヒドロキシアルキルセルロースなどの水溶性セルロース化合物、ポリビニルアルコール化合物やポリアクリルアミド類、カゼイン、大豆蛋白、合成蛋白などの蛋白質類やラテックス類などの通常の塗工紙用接着剤を一種類以上併用しても良い。 Starch is preferable because it has a high adhesive ability with hydrophilic fibers and strongly adheres fine fibers that easily fall off the paper surface when the coating amount is small. Examples of the starches include enzyme-modified starch, oxidized starch, etherified starch, esterified starch, cationized starch, and hydrophobic starch. In addition, water-soluble cellulose compounds such as carboxymethylcellulose, methylcellulose, and hydroxyalkylcellulose, polyvinyl alcohol compounds and polyacrylamides, proteins such as casein, soy protein, synthetic proteins, and latex adhesives, etc. One or more types may be used in combination.

本発明においては、良好な印刷作業性と印刷品質を提供する上で、接着剤の塗布量は片面あたり0.20〜1.0g/mとするのが好ましく、より好ましくは0.20〜0.50g/mである。接着剤の塗布量が規定量より少ないとパイリングなどに代表される表面強度に纏わるトラブルが起こるおそれがあり、規定量より多いと不透明度を低下させる傾向がある。 In the present invention, in order to provide good printing workability and printing quality, the coating amount of the adhesive is preferably 0.20 to 1.0 g / m 2 per side, and more preferably 0.20 to 0.20. 0.50 g / m 2 . If the application amount of the adhesive is less than the specified amount, troubles related to the surface strength represented by piling may occur, and if it is more than the specified amount, the opacity tends to be reduced.

本発明のオフセット印刷用紙は、吸油度(旧JISP3001)は50秒以上で、吸油度の表裏差は10秒以下にするのが好ましい。吸油度が50秒未満であるとインキ吸収速度が速いのでインキが紙層内部に浸透し、裏抜けが目立つようになる。
吸油度の表裏差が10秒を超えると、表裏のインキ発色性が異なるので、見た目に違和感を与えることがある。
吸油度は、使用する填料の吸油量や添加率、表面処理剤の塗布量、カレンダー処理条件等により調整することができる。
The offset printing paper of the present invention preferably has an oil absorption (former JISP3001) of 50 seconds or more and a difference in front and back of oil absorption of 10 seconds or less. If the oil absorption is less than 50 seconds, the ink absorption speed is fast, so that the ink penetrates into the paper layer, and the breakthrough becomes noticeable.
If the difference in front and back of the oil absorption exceeds 10 seconds, the ink colorability on the front and back sides may be different, which may give an unnatural appearance.
The oil absorption can be adjusted by the oil absorption amount and addition rate of the filler to be used, the coating amount of the surface treatment agent, the calendar treatment conditions, and the like.

表面処理剤をオフセット印刷用紙原紙へ塗布するための装置としては、特に限定さないが、例えばツーロールサイズプレス、ブレードメタリングサイズプレス、ロッドメタリングサイズプレス、ゲートロールコーターなどのロールコーター、トレーリング、フレキシブル、ロールアプリケーション、ファウンテンアプリケーション、ショートドゥエルなどのベベルタイプやベントタイプのブレードコーター、ロッドコーター、バーコーター、エアーナイフコーター、カーテンコーター、スプレーコーター、グラビアコーターなどの公知公用の装置が適宜使用される。なお、表面処理剤組成物を塗布後の湿潤塗布層を乾燥する方法としては、例えば、蒸気乾燥、ガスヒーター乾燥、電気ヒーター乾燥、赤外線ヒーター乾燥などの各種方式が採用できる。 The apparatus for applying the surface treatment agent to the base paper of the offset printing paper is not particularly limited. For example, a roll coater such as a two roll size press, a blade metalling size press, a rod metalling size press, a gate roll coater, a tray Well-known and public equipment such as ring, flexible, roll application, fountain application, short dwell and other bevel type and vent type blade coaters, rod coaters, bar coaters, air knife coaters, curtain coaters, spray coaters, gravure coaters are used as appropriate. Is done. In addition, as a method of drying the wet application layer after apply | coating a surface treating agent composition, various systems, such as vapor | steam drying, gas heater drying, electric heater drying, and infrared heater drying, are employable, for example.

本発明の印刷用紙の製造に際しては、ドライヤーで乾燥後に、カレンダー装置により平滑化処理する。カレンダー装置としては、チルドカレンダー、ソフトカレンダー、グロスカレンダー等の一般に使用されているカレンダー装置が使用できる。要求される平滑度に応じて、ニップ数やニップ圧、ロール温度、ロール材質、ロール硬度等を設定するが、インキ着肉性を得るには、オフセット印刷用紙の平滑度(JISP8119)は30秒以上、平滑度の表裏差は5秒以下であることが望ましい。 In producing the printing paper of the present invention, the paper is dried by a dryer and then smoothed by a calendar device. As the calendar device, commonly used calendar devices such as a chilled calendar, a soft calendar, and a gloss calendar can be used. The number of nips, nip pressure, roll temperature, roll material, roll hardness, etc. are set according to the required smoothness, but the smoothness of offset printing paper (JISP 8119) is 30 seconds in order to obtain ink fillability. As described above, it is desirable that the difference between the front and back of the smoothness is 5 seconds or less.

本発明の印刷用紙は、坪量(JISP8124)が35〜50g/mとされている。坪量が35g/mより小さいと剛度が不足する。坪量は大きいほど剛度には有利であるが、省資源という点から50g/m以下が好ましい。このようにして得られる印刷用紙は、白色度(JISP8148)60%以上、不透明度(JISP8149)85%以上とされる。 The printing paper of the present invention has a basis weight (JISP 8124) of 35 to 50 g / m 2 . If the basis weight is less than 35 g / m 2 , the rigidity is insufficient. Larger basis weight is more advantageous for rigidity, but 50 g / m 2 or less is preferable from the viewpoint of resource saving. The printing paper thus obtained has a whiteness (JISP8148) of 60% or more and an opacity (JISP8149) of 85% or more.

以下、実施例及び比較例により、本発明の効果を具体的に表す。なお、%は特に断りのない限り質量%を表し、添加量は絶乾パルプに対する固形分または有効成分で表す。 Hereinafter, the effects of the present invention will be specifically described by Examples and Comparative Examples. In addition, unless otherwise indicated,% represents the mass%, and the addition amount represents the solid content or the active ingredient with respect to the absolutely dry pulp.

(実施例1)
LBKP25質量部(350mlCSF)、サーモメカニカルパルプ35質量部(110mlCSF)、新聞古紙脱墨パルプ40質量部(230mlCSF、機械パルプの含有率45質量%)からなるパルプ分散液に、填料としてホワイトカーボン(吸油量200cc/100g)を2.2質量%、軽質炭酸カルシウム(吸油量85cc/100g)を5.0質量%含むように添加し、歩留り向上剤(ハイモ社製、商品名:ND260)を対パルプ200ppm添加して抄紙した。ドライヤーパートで表面処理剤として酸化澱粉(王子コーンスターチ株式会社製、商品名:王子エースA)を塗布量が片面当たり0.50g/m、焼成カオリン(吸油量95cc/100g)を塗布量が片面当たり0.010g/mとなるように表裏同一塗布量でゲートロールコーターを用いて塗布、乾燥し、ソフトカレンダー処理(線圧70kN/m、温度80℃)し、坪量49.0g/m、水分6.0%のオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
ここで、紙cmあたりに含まれる填料が持つ吸油量(cc)は、次式により求められる。
紙の密度[g/cm]×((100−水分[%])/100)×(灰分[%]/100)×填料の吸油量[cc/100g]/100
また、紙m当たり顔料の持つ吸油量は、{(顔料の吸油量[cc/100g]/100)×(顔料の片面塗布量[g/m])}である。
Example 1
White carbon (oil absorbing oil) is used as a filler in a pulp dispersion composed of 25 parts by mass of LBKP (350 ml CSF), 35 parts by mass of thermomechanical pulp (110 ml CSF), and 40 parts by mass of newspaper waste ink deinked pulp (230 ml CSF, 45% by mass of mechanical pulp content). Amount 200cc / 100g) is added to 2.2% by mass and light calcium carbonate (oil absorption 85cc / 100g) is added to 5.0% by mass, and a yield improver (trade name: ND260, manufactured by Hymo Co., Ltd.) is added to the pulp. Paper was made by adding 200 ppm. Oxidized starch (made by Oji Cornstarch Co., Ltd., trade name: Oji Ace A) as a surface treatment agent in the dryer part is applied at 0.50 g / m 2 per side, and calcined kaolin (oil absorption 95 cc / 100 g) is applied at one side. Using a gate roll coater with the same coating amount on the front and back so as to be 0.010 g / m 2 per unit, drying, soft calendering (linear pressure 70 kN / m, temperature 80 ° C.), basis weight 49.0 g / m 2. An offset printing paper having a moisture content of 6.0% was obtained. Tables 1 and 2 show the evaluation results of the obtained printing paper.
Here, the oil absorption amount (cc) of the filler contained in the paper cm 3 is obtained by the following equation.
Paper density [g / cm 3 ] × ((100−moisture [%]) / 100) × (ash content [%] / 100) × filler oil absorption [cc / 100 g] / 100
Further, the oil absorption amount of the pigment per paper m 2 is {(pigment oil absorption amount [cc / 100 g] / 100) × (pigment one-side coating amount [g / m 2 ])}.

(実施例2)
填料としてホワイトカーボンを1.5質量%、軽質炭酸カルシウムを5.0質量%含むように添加し、焼成カオリンを塗布量が片面当たり0.10g/mとなるようにした以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Example 2)
Example 1 except that 1.5% by mass of white carbon and 5.0% by mass of light calcium carbonate were added as fillers, and the amount of calcined kaolin applied was adjusted to 0.10 g / m 2 per side. Similarly, an offset printing paper was obtained. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例3)
焼成カオリンを塗布量が片面当たり0.50g/mとなるようにした以外は実施例2と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Example 3)
An offset printing paper was obtained in the same manner as in Example 2 except that the amount of baked kaolin applied was 0.50 g / m 2 per side. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例4)
填料としてホワイトカーボンを1.0質量%、軽質炭酸カルシウムを7.0質量%含むように添加し、焼成カオリンを塗布量が片面当たり1.0g/mとなるようにした以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
Example 4
Example 1 except that 1.0% by mass of white carbon and 7.0% by mass of light calcium carbonate were added as fillers, and the amount of calcined kaolin was 1.0 g / m 2 per side. Similarly, an offset printing paper was obtained. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例5)
填料としてホワイトカーボンを1.0質量%、軽質炭酸カルシウムを5.0質量%含むように添加し、抄紙したことと、ドライヤーパートで表面処理剤として酸化澱粉を塗布量が片面当たり0.25g/m、顔料としてカオリン(吸油量45cc/100g)を使用し、塗布量が片面当たり0.10g/mとなるように塗布した以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Example 5)
Addition of 1.0% by weight of white carbon as filler and 5.0% by weight of light calcium carbonate to make paper, and the coating amount of oxidized starch as a surface treatment agent in the dryer part is 0.25 g / side. Offset printing paper was obtained in the same manner as in Example 1 except that kaolin (oil absorption 45 cc / 100 g) was used as m 2 and the pigment was applied so that the coating amount was 0.10 g / m 2 per side. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例6)
填料としてホワイトカーボンを1.0質量%、軽質炭酸カルシウムを7.0質量%含むように添加し、抄紙したことと、ドライヤーパートで表面処理剤として酸化澱粉を塗布量が片面当たり0.75g/m、顔料としてカオリン(吸油量45cc/100g)を使用し、塗布量が片面当たり0.10g/mとなるようにした以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Example 6)
Addition of 1.0% by weight white carbon as filler and 7.0% by weight light calcium carbonate to make paper, and the coating amount of oxidized starch as a surface treatment agent in the dryer part is 0.75 g / side. Offset printing paper was obtained in the same manner as in Example 1 except that kaolin (oil absorption 45 cc / 100 g) was used as m 2 , and the coating amount was 0.10 g / m 2 per side. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例7)
坪量を43.0g/mとし、顔料としてカオリン(吸油量45cc/100g)を使用し、塗布量が片面当たり0.10g/mとなるようにした以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Example 7)
Offset as in Example 1 except that the basis weight was 43.0 g / m 2 , kaolin (oil absorption 45 cc / 100 g) was used as the pigment, and the coating amount was 0.10 g / m 2 per side. I got printing paper. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例8)
坪量を43.0g/mとし、顔料としてカオリン(吸油量45cc/100g)を使用し、塗布量が片面当たり0.10g/mとなるようにした以外は実施例2と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Example 8)
Offset as in Example 2 except that the basis weight was 43.0 g / m 2 , kaolin (oil absorption 45 cc / 100 g) was used as the pigment, and the coating amount was 0.10 g / m 2 per side. I got printing paper. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例9)
坪量を43.0g/mとし、顔料としてカオリン(吸油量45cc/100g)を使用し、塗布量が片面当たり0.10g/mとなるようにした以外は実施例4と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
Example 9
Offset as in Example 4 except that the basis weight was 43.0 g / m 2 , kaolin (oil absorption 45 cc / 100 g) was used as the pigment, and the coating amount was 0.10 g / m 2 per side. I got printing paper. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例10)
坪量を43.0g/mとした以外は実施例5と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Example 10)
An offset printing paper was obtained in the same manner as in Example 5 except that the basis weight was 43.0 g / m 2 . Tables 1 and 2 show the evaluation results of the obtained printing paper.

(実施例11)
坪量を37.0g/m、填料としてホワイトカーボンを2.5質量%、軽質炭酸カルシウムを5.0質量%含むように添加し、抄紙したことと、ドライヤーパートで表面処理剤として酸化澱粉を塗布量が片面当たり1.0g/m、顔料としてカオリン(吸油量45cc/100g)を使用し、塗布量が片面当たり0.10g/mとなるようにした以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Example 11)
The basis weight was 37.0 g / m 2 , white carbon was added as a filler, 2.5% by mass, light calcium carbonate was added so as to contain 5.0% by mass, paper was made, and oxidized starch as a surface treatment agent in the dryer part. The coating amount was 1.0 g / m 2 per side, kaolin (oil absorption 45 cc / 100 g) was used as the pigment, and the coating amount was 0.10 g / m 2 per side, the same as in Example 1. The offset printing paper was obtained. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(比較例1)
填料としてホワイトカーボンを0.50質量%、軽質炭酸カルシウムを5.0質量%含むように添加し、顔料を塗布しなかった以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Comparative Example 1)
Offset printing paper was obtained in the same manner as in Example 1 except that 0.50% by mass of white carbon and 5.0% by mass of light calcium carbonate were added as fillers and no pigment was applied. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(比較例2)
填料としてホワイトカーボンを1.0質量%、軽質炭酸カルシウムを12.0質量%含むように添加し、顔料を塗布しなかった以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Comparative Example 2)
Offset printing paper was obtained in the same manner as in Example 1 except that 1.0% by mass of white carbon and 12.0% by mass of light calcium carbonate were added as fillers and no pigment was applied. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(比較例3)
填料としてホワイトカーボンを1.5質量%、軽質炭酸カルシウムを5.0質量%含むように添加し、顔料を塗布しなかった以外は実施例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Comparative Example 3)
Offset printing paper was obtained in the same manner as in Example 1 except that 1.5% by mass of white carbon and 5.0% by mass of light calcium carbonate were added as fillers and no pigment was applied. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(比較例4)
坪量を43.0g/mとし、顔料をホワイトカーボン(吸油量200cc/100g)とし、塗布量が片面当たり0.60g/mとなるようにした以外は比較例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Comparative Example 4)
Offset printing as in Comparative Example 1, except that the basis weight is 43.0 g / m 2 , the pigment is white carbon (oil absorption 200 cc / 100 g), and the coating amount is 0.60 g / m 2 per side. Got the paper. Tables 1 and 2 show the evaluation results of the obtained printing paper.

(比較例5)
坪量を43.0g/mとした以外は比較例2と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Comparative Example 5)
An offset printing paper was obtained in the same manner as in Comparative Example 2 except that the basis weight was 43.0 g / m 2 . Tables 1 and 2 show the evaluation results of the obtained printing paper.

(比較例6)
顔料としてタルク(吸油量34cc/100g)を使用し、塗布量が片面当たり0.020g/mとなるようにした以外は比較例1と同様にオフセット印刷用紙を得た。得られた印刷用紙の評価結果を表1、表2に示す。
(Comparative Example 6)
Offset printing paper was obtained in the same manner as in Comparative Example 1 except that talc (oil absorption amount: 34 cc / 100 g) was used as a pigment and the coating amount was 0.020 g / m 2 per side. Tables 1 and 2 show the evaluation results of the obtained printing paper.

なお、試験方法と評価方法は次のとおりである。
(坪量)JISP8124:1998紙及び板紙−坪量測定方法
(厚さ)JISP8118:1998紙及び板紙−厚さ及び密度の試験方法
(吸油量)紙cmあたりに含まれる填料が持つ吸油量は、それぞれの填料について次式により求め、合計した。なお、填料の吸油量は、JISK5101−13−2:2004煮あまに油法による。
紙の密度[g/cm]×((100−水分[%])/100)×(灰分[%]/100)×填料の吸油量[cc/100g]/100
(灰分)JISP8251:2003紙、板紙及びパルプ−灰分試験方法−525℃燃焼法
(白色度)JISP8148:2001紙、板紙及びパルプ−ISO白色度(拡散青色光反射率)の測定方法
(不透明度)JISP8149:2000紙及び板紙−不透明度試験方法(紙の裏当て)−拡散照射法
(平滑度)JISP8119:1998紙及び板紙−ベック平滑度試験機による平滑度試験方法
(吸油度)旧JISP3001:1995新聞巻取紙に準じて測定した。
(インキ発色性、パイリング評価)オフセット輪転印刷機を用い、印刷速度700rpm、紙面温度120℃で4色印刷(オフ輪用プロセスインキ 墨・紅・藍・黄)を行い、5千部印刷した。
インキ発色性は、◎優れる、○良い、×悪い の3段階で評価した。
パイリングは、ブランケットと印刷面を観察し、次の3段階で評価した。
◎:ブランケットにパイリングの発生がなく良好であった。
○:ブランケットにややパイリングの発生があるが、印刷面に問題のない程度であった。
×:ブランケットにパイリングが発生し、印刷面にカスレがみられた。
The test method and evaluation method are as follows.
(Basis weight) JISP 8124: 1998 paper and paperboard-basis weight measurement method (thickness) JISP8118: 1998 paper and paperboard-thickness and density test method (oil absorption amount) The oil absorption amount of the filler contained per cm 3 of paper is Each filler was calculated by the following formula and totaled. In addition, the oil absorption amount of a filler is based on the oil method in JISK5101-13-2: 2004 boiled sea urchin.
Paper density [g / cm 3 ] × ((100−moisture [%]) / 100) × (ash content [%] / 100) × filler oil absorption [cc / 100 g] / 100
(Ash) JISP8251: 2003 paper, paperboard and pulp-Ash content test method-525 ° C combustion method (whiteness) JISP8148: 2001 paper, paperboard and pulp-ISO whiteness (diffuse blue light reflectance) measurement method (opacity) JISP8149: 2000 paper and paperboard-Opacity test method (backing of paper)-Diffuse irradiation method (smoothness) JISP8119: 1998 Paper and paperboard-Smoothness test method (oil absorption) by Beck smoothness tester Old JISP3001: 1995 Measured according to newspaper rolls.
(Evaluation of Ink Coloring and Piling) Using an offset rotary printing press, four-color printing was performed at a printing speed of 700 rpm and a paper surface temperature of 120.degree.
The ink coloring property was evaluated in three stages: excellent, good, and poor.
Piling was evaluated in the following three stages by observing the blanket and the printed surface.
A: The blanket was good with no occurrence of piling.
○: Piling is slightly generated in the blanket, but there is no problem on the printed surface.
X: Piling occurred on the blanket, and scum was observed on the printed surface.

Figure 2011219887
Figure 2011219887

Figure 2011219887
Figure 2011219887

表1、表2に示したように、本発明の実施例1〜11では、いずれもインキ発色性評価、パイリング評価ともに良好であることがわかる。
比較例1は、紙cmあたり填料が持つ吸油量が0.031ccと低く、しかも顔料を塗布していないので、インキ発色性評価が悪くなっている。
比較例2は、紙cmあたり填料が持つ吸油量が0.074ccと高く、しかも灰分が15.2%と高いので、インキ発色性評価は良いがパイリング評価が悪くなっている。
比較例3は、顔料を塗布していないので、インキ発色性評価が悪くなっている。
比較例4は、紙m当たり顔料の持つ吸油量が1.2ccと高く、インキ発色性評価は良いが、パイリング評価が悪くなっている。
比較例5は、紙cmあたり填料が持つ吸油量が0.076ccと高く、しかも灰分が15.2%と高いので、インキ発色性評価は良いがパイリング評価が悪くなっている。
比較例6は、紙cmあたり填料が持つ吸油量が0.031ccと低く、しかも紙m当たり顔料の持つ吸油量が0.0070ccと低いので、インキ発色性評価が悪い。
As shown in Tables 1 and 2, it can be seen that in Examples 1 to 11 of the present invention, both ink color development evaluation and piling evaluation are good.
In Comparative Example 1, the oil absorption amount of the filler per 3 cm 3 of paper is as low as 0.031 cc, and since the pigment is not applied, the ink coloring property evaluation is poor.
In Comparative Example 2, since the oil absorption amount of the filler per cm 3 of paper is as high as 0.074 cc and the ash content is as high as 15.2%, the ink coloring property evaluation is good, but the piling evaluation is poor.
In Comparative Example 3, since the pigment was not applied, the ink color development evaluation was poor.
In Comparative Example 4, the oil absorption amount of the pigment per m 2 of paper is as high as 1.2 cc, and the ink color development evaluation is good, but the piling evaluation is poor.
In Comparative Example 5, the oil absorption amount of the filler per cm 3 of paper is as high as 0.076 cc, and the ash content is as high as 15.2%. Therefore, the ink coloring property evaluation is good, but the piling evaluation is poor.
In Comparative Example 6, since the oil absorption amount of the filler per cm 3 paper is as low as 0.031 cc, and the oil absorption amount of the pigment per paper m 2 is as low as 0.0070 cc, the ink coloring property evaluation is poor.

本発明のオフセット印刷用紙は、チラシ用途に好適に使用されるほか、フリーペーパーやフリーマガジンの用紙として使用できる。印刷方式としては、ヒートセット型オフセット輪転印刷、コールドセット型オフセット輪転印刷にも使用できる。 The offset printing paper of the present invention is suitably used for flyer applications, and can also be used as free paper or free magazine paper. As a printing method, it can also be used for heat set type offset rotary printing and cold set type offset rotary printing.

Claims (2)

下記の(1)から(11)の条件を満たすオフセット印刷用紙。
(1)白色度60%以上
(2)不透明度85%以上
(3)平滑度30秒以上、平滑度表裏差5秒以下
(4)吸油度50秒以上、吸油度表裏差10秒以下
(5)坪量35〜50g/m
(6)全パルプ中機械パルプを20〜60質量%含有
(7)灰分5.0〜15%
(8)ホワイトカーボンを灰分として0.50〜2.5%含有
(9)紙cmあたりに含まれる填料が持つ吸油量が0.035〜0.070cc
(10)澱粉系の表面処理剤を片面0.20〜1.0g/m塗布
(11)顔料を含む表面処理剤を塗布し、紙m当たり顔料の持つ吸油量が0.010〜1.0cc
Offset printing paper that satisfies the following conditions (1) to (11).
(1) Whiteness 60% or more (2) Opacity 85% or more (3) Smoothness 30 seconds or more, smoothness front / back difference 5 seconds or less (4) Oil absorption 50 seconds or more, oil absorption front / back difference 10 seconds or less (5 ) Basis weight 35-50g / m 2
(6) Contains 20 to 60% by mass of mechanical pulp in all pulp (7) Ash content is 5.0 to 15%
(8) Containing 0.50 to 2.5% of white carbon as ash (9) Oil absorption amount of filler contained per cm 3 of paper is 0.035 to 0.070 cc
(10) Applying a starch-based surface treatment agent to 0.20 to 1.0 g / m 2 on one side (11) Applying a surface treatment agent containing a pigment, the oil absorption amount of the pigment per m 2 of paper is 0.010 to 1 .0cc
全パルプ中機械パルプを20〜60質量%含有するパルプスラリーを原料として抄紙するオフセット印刷用紙の製造方法であって、ホワイトカーボンを灰分として0.50〜2.5%含有させるとともに、ホワイトカーボンを除く填料を含有させて、灰分5.0〜15%、紙cmあたりに含まれる填料が持つ吸油量が0.035〜0.070cc、顔料を含む表面処理剤を塗布し、紙m当たり顔料の持つ吸油量が0.010〜1.0ccとなるように調整することを特徴とするオフセット印刷用紙の製造方法。 A method for producing offset printing paper, in which a pulp slurry containing 20 to 60% by mass of mechanical pulp in all pulp is used as a raw material, containing 0.50 to 2.5% of white carbon as ash, and containing white carbon Excluding filler, applying ash content of 5.0 to 15%, oil absorption amount of filler contained in paper cm 3 of 0.035 to 0.070 cc, pigment containing surface treatment agent, per m 2 of paper A method for producing offset printing paper, wherein the oil absorption amount of the pigment is adjusted to be 0.010 to 1.0 cc.
JP2010088305A 2010-04-07 2010-04-07 Offset printing paper and method of manufacturing thereof Pending JP2011219887A (en)

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