JP2001254295A - Coated paper for printing - Google Patents

Coated paper for printing

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Publication number
JP2001254295A
JP2001254295A JP2000173608A JP2000173608A JP2001254295A JP 2001254295 A JP2001254295 A JP 2001254295A JP 2000173608 A JP2000173608 A JP 2000173608A JP 2000173608 A JP2000173608 A JP 2000173608A JP 2001254295 A JP2001254295 A JP 2001254295A
Authority
JP
Japan
Prior art keywords
pigment
printing
paper
coating layer
coated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2000173608A
Other languages
Japanese (ja)
Other versions
JP3736609B2 (en
Inventor
Takayuki Kishida
隆之 岸田
Yasuhiro Arai
康宏 荒井
Terunobu Fukui
照信 福井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Oji Paper Co Ltd
Original Assignee
Oji Paper Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oji Paper Co Ltd filed Critical Oji Paper Co Ltd
Priority to JP2000173608A priority Critical patent/JP3736609B2/en
Publication of JP2001254295A publication Critical patent/JP2001254295A/en
Application granted granted Critical
Publication of JP3736609B2 publication Critical patent/JP3736609B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a coated paper for printing with a sheet-fed offset press, having especially excellent printability and giving good printed product having high gloss and free from defect of pattern and high productivity in the printing work. SOLUTION: This coated paper for printing has a pigment coating layer composed mainly of a pigment and an adhesive on a base paper. The cumulative void volume of the paper in the void diameter range of 0.03-0.4 μm is 4.0-10 mL/m2 and the average void diameter is 0.04-0.20 μm measured by mercury intrusion method and the absorption coefficient Ka of the paper measured by a Bristow tester using the standard viscosity oil (JS2.5) specified by JIS Z8809 as an evaluation liquid is 0.35-1.5 mL/(m2.ms1/2).

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は印刷用塗被紙に関
し、さらに詳しくはシートで１枚ずつ印刷するオフセッ
ト枚葉印刷機で印刷するに際して、良好な印刷適性を有
し、高い印刷光沢と図柄に欠点のない良好な印刷仕上が
り、および印刷作業における高い生産性を与える印刷用
塗被紙に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated paper for printing, and more particularly to a coated sheet for printing on an offset sheet-fed printing press which prints one by one on a sheet. The present invention relates to a coated paper for printing which gives good print finish without defects and high productivity in a printing operation.

【０００２】[0002]

【従来の技術】近年、出版や広告用などで小ロットの印
刷要望が増えている。これら小ロット印刷では、オフセ
ット印刷により紙シートを１枚づつ印刷する枚葉印刷方
式が主流である。この印刷方式では、1回の印刷作業で
紙シートの片面を印刷するという片面オフセット枚葉印
刷機（以後、単に片面機と称する）の使用が多い。片面
機で紙シートの両面を印刷する場合、まず１回目の印刷
作業で片方の面を印刷し、その面のインキがある程度乾
燥するまでの間放置した後、次の印刷作業で反対面を印
刷するという作業手順で行なわれる。このため、上記片
面機での生産性向上のために、片方の面を印刷した後、
その面のインキがある程度乾燥するまでの待ち時間をで
きるだけ短くして、反対面の印刷に取り掛かりたいとい
う要望が強い。片面機において、片方の面を印刷した
後、できるだけ短い間隔で反対面の印刷を行うような手
法としては、セット性や乾燥性が速いインキを使用す
る、またはインキを速くセットすることができる用紙を
使用する。さらには、そのようなインキと用紙を組み合
わせて使用するなどの方法を採用することが多い。しか
しながら、セットの速いインキを使用したり、インキを
速くセットすることができる用紙を使用すると良好な印
刷作業性で高い生産性（印刷効率）が得られるものの、
良好な印刷仕上り（高い印刷光沢）が得られないという
問題がある。2. Description of the Related Art In recent years, there has been an increasing demand for printing small lots for publication and advertisement. In these small lot printings, a sheet-fed printing method in which paper sheets are printed one by one by offset printing is mainly used. In this printing method, a single-sided offset sheet-fed printing press (hereinafter simply referred to as a single-sided press) that prints one side of a paper sheet in one printing operation is often used. When printing on both sides of a paper sheet with a single-sided machine, print one side first in the first printing operation, leave it until the ink on that side dries to some extent, and then print the opposite side in the next printing operation It is performed in the work procedure of doing. For this reason, in order to improve the productivity of the single-sided machine, after printing one side,
There is a strong demand that the waiting time for the ink on that side to dry to some extent should be as short as possible, and that printing on the opposite side should begin. As a method of printing on one side and printing on the other side at the shortest possible interval after printing on one side, use ink with fast setting and drying properties, or paper on which ink can be set quickly Use Furthermore, a method of using such a combination of ink and paper is often employed. However, if high-speed ink is used or paper on which ink can be set quickly is used, high productivity (printing efficiency) can be obtained with good printing workability.
There is a problem that good print finish (high print gloss) cannot be obtained.

【０００３】これとは別に、紙シートの両面を１工程で
印刷できるオフセット枚葉両面印刷機（以後、単に両面
機と称する）が、最近広まっている。両面機は、まず片
方の面を印刷した後、連続して反対面を印刷する方式、
シートの表裏を交互に印刷する方式の２つの方式があ
り、いずれの方式でも、片面機のように片方の面を先ず
印刷して、その面のインキがある程度乾燥するまで放置
した後反対面を印刷するといった、放置時間を設ける必
要がなく、生産性の高い印刷機である。しかしながら、
両面機の場合、先に印刷した面のインキが殆ど乾いてい
ない状態で反対面の印刷が行われるために、反対面を印
刷する際に先印刷面が接触する圧胴に先印刷面のインキ
が取られて堆積したり、先印刷面の図柄に欠点が生じた
りする印刷適性上の問題の有ることが知られている。[0003] Separately, an offset sheet-fed duplex printing machine (hereinafter, simply referred to as a duplex machine) capable of printing both sides of a paper sheet in one step has recently been widespread. The duplexer prints one side first and then prints the other side continuously.
There are two methods of printing the front and back of the sheet alternately. In either method, one side is printed first like a single-sided machine, and the other side is left after the ink on that side is dried to some extent. There is no need to provide a waiting time for printing, and the printing machine has high productivity. However,
In the case of a duplex machine, the printing on the opposite side is performed in a state where the ink on the previously printed side is hardly dried. It is known that there is a problem in printability that the toner is removed and accumulated, or a defect occurs in the design of the preprinted surface.

【０００４】両面機における、反対面印刷時の先印刷面
インキの圧胴への堆積や先印刷面の欠点の発生を防止す
るために、圧胴に、所謂セラミックジャケットを取り
付け、印刷面が接触する圧胴表面を微細な凹凸があり、
かつこの表面が離型剤で処理されたものとすることや、
セット性や乾燥性が遅いインキを使用して、紙が印刷
機械上を走行している間は用紙上のインキが中途半端に
セットしたり乾燥したりしないようにした、所謂ノンス
キンタイプあるいはオーバーナイトタイプと呼ばれるイ
ンキを使用すること、さらには、用紙としてインキセ
ット性や乾燥性が遅いものを使用するなどの対応が取ら
れている。しかしながら、上記の対応は別として、上
記やの対応は、印刷されたインキのセットや乾燥が
遅くなるために、両面の印刷は終了しているものの、折
りや製本などの次工程に移すまでにかなりの時間放置し
ておく必要があるなど、両面機の生産性の高さを阻害す
るという別の問題を引き起こしている。さらに、上記
のような用紙は、両面機には適合したとしても、前記片
面機に使用した場合には反対面を印刷する迄の放置時間
を長くする必要があり、印刷作業における生産性を低下
させるものである。A so-called ceramic jacket is attached to the impression cylinder in order to prevent the ink on the impression cylinder from being deposited on the impression cylinder and the occurrence of defects on the impression face during printing on the opposite side in the duplex machine. The impression cylinder surface has fine irregularities,
And that this surface has been treated with a release agent,
A so-called non-skin type or over-ink that uses ink with slow setting and drying properties so that the ink on the paper is not set or dried halfway while the paper is running on the printing press. Attempts have been made to use inks of the night type, and to use paper having slow ink setting and drying properties. However, apart from the above countermeasures, the above countermeasures are because the setting and drying of the printed ink is delayed, so that printing on both sides has been completed, but before moving on to the next process such as folding and bookbinding Another problem is that the productivity of the duplexer is hindered, such as the need to leave it for a considerable amount of time. Further, even if the above-described paper is suitable for a duplex machine, when used in the simplex machine, it is necessary to lengthen the leaving time until printing on the opposite side, which lowers productivity in a printing operation. It is to let.

【０００５】上記により、片面機、両面機のどちらにも
使用でき、かつ片面機おける良好な印刷仕上りと高い生
産性、また両面機における図柄に欠点のない良好な印刷
仕上り、良好な印刷適性と高い生産性のいずれをも満足
する印刷用塗被紙が望まれているが、現在の市場におい
て、いまだに、それらを満足するものが見当たらないの
が実状である。[0005] As described above, it is possible to use both a single-sided machine and a double-sided machine, and to obtain a good print finish and high productivity in a single-sided machine, a good print finish with no defects in the design in a double-sided machine, and a good printability. There is a demand for coated printing paper that satisfies both of the high productivity, but in the current market, there is still no one that satisfies them.

【０００６】[0006]

【発明が解決しようとする課題】本発明は、オフセット
枚葉印刷の片面機や両面機のいずれでも使用でき、良好
な印刷適性を有して良好な印刷仕上りと高い生産性を与
えることのできる印刷用塗被紙を提供することにある。
具体的には、本発明の印刷用塗被紙は、上記印刷方法で
印刷した印刷物に高い印刷光沢を与えながら、片面機で
は短時間反転印刷を可能とする速いインキセット性およ
びインキ乾燥性を有しており、かつ両面機で使用された
場合でも、先印刷面のインキが圧胴に取られて蓄積した
り、印刷面に欠点を生じさせるようなことがない良好な
印刷適性、および印刷仕上がりと、印刷終了後短時間で
次の加工作業に取り掛かることができる速いインキ乾燥
性を有するものである。The present invention can be used in either one-sided or two-sided offset sheet-fed printing, and can provide good printability with good print finish and high productivity. It is to provide a coated paper for printing.
Specifically, the coated printing paper of the present invention has a high ink setting property and ink drying property that enables short-time reversal printing on a single-sided press, while imparting high print gloss to the printed matter printed by the above printing method. Good printability and printability that does not cause ink on the preprinted surface to be taken up and accumulated on the impression cylinder or cause defects on the printed surface even when used and used in a duplex machine It has a finish and fast ink drying properties so that the next processing operation can be started in a short time after printing is completed.

【０００７】[0007]

【課題を解決するための手段】本発明は、原紙の少なく
とも片面に顔料と接着剤を主成分とする顔料塗被層を１
層以上有する印刷用塗被紙において、水銀圧入法によっ
て測定した空隙径０．０３〜０．４μｍの範囲の空隙に
おける累積空隙容積と平均空隙径が各々４．０〜１０ｍ
ｌ／ｍ2と０．０４〜０．２μｍの範囲にあり、さらに
該塗被紙のブリストー試験機を使用してＪＩＳ Ｚ８８
０９−１９９２に規定される標準粘度オイル（ＪＳ２．
５）を評価液に用いて測定した吸収係数Ｋａが０．３５
〜１．５ｍｌ／（ｍ2・ｍｓ1/2）であることを特徴とす
る印刷用塗被紙であり、さらに、本発明には以下の態様
も含まれる。According to the present invention, a pigment coated layer mainly composed of a pigment and an adhesive is provided on at least one side of a base paper.
In a printing coated paper having at least two layers, the cumulative void volume and the average void diameter in the voids having a void diameter of 0.03 to 0.4 μm measured by a mercury intrusion method are 4.0 to 10 m, respectively.
1 / m 2 and in the range of 0.04 to 0.2 μm, and the coated paper is subjected to JIS Z88 using a Bristow tester.
Standard viscosity oil (JS2.
The absorption coefficient Ka measured using 5) as an evaluation solution is 0.35.
１．５1.5 ml / (m 2 · ms 1/2 ), which is a coated paper for printing characterized by the following aspects.

【０００８】即ち、顔料塗被層を原紙の両面に有し、
かつ該顔料塗被層面のＪ．ＴＡＰＰＩ紙パルプ試験方法
Ｎｏ．５Ｂに準拠して測定した平滑度（以後、単に王研
式平滑度と称する）が３００秒以上である印刷用塗被
紙、顔料塗被層が、外側顔料塗被層とそれに隣接する
原紙面に近い内側顔料塗被層の少なくとも2層からな
り、該外側顔料塗被層が、顔料として炭酸カルシウムを
全顔料の７０〜１００重量％、かつ接着剤を全顔料に対
して１０〜２０重量％含有し、さらに該内側顔料塗被層
が、顔料として平均粒子径０．１〜１．０μｍの炭酸カ
ルシウムを全顔料の８０〜１００重量％、かつ接着剤を
全顔料に対して１０重量％以下となるように含有せしめ
た印刷用塗被紙、外側顔料塗被層中の炭酸カルシウム
の３０〜１００重量％が、平均粒子径０．３〜１．５μ
ｍの軽質炭酸カルシウムである印刷用塗被紙、さらに
は、原紙の少なくとも片面に顔料と接着剤を主成分と
する顔料塗被層を有する印刷用塗被紙において、該顔料
塗被層が、外側顔料塗被層とそれに隣接する原紙面に近
い内側顔料塗被層の少なくとも2層からなり、該塗被紙
の断面観察により求めた該外側顔料塗被層の平均空隙径
ＲO（μｍ）と該内側顔料塗被層の平均空隙径ＲI（μ
ｍ）の関係が、０．１ＲO≦ＲI≦０．９５ＲOであるこ
とを特徴とする印刷用塗被紙である。That is, a pigment coated layer is provided on both sides of the base paper,
And J.I. on the surface of the pigment coating layer. TAPPI paper pulp test method No. The printing coated paper and the pigment coated layer having a smoothness (hereinafter simply referred to as Oken-type smoothness) of 300 seconds or more measured according to 5B are the outer pigment coated layer and the base paper surface adjacent thereto. At least two layers of an inner pigment coating layer close to the pigment, wherein the outer pigment coating layer contains calcium carbonate as a pigment in an amount of 70 to 100% by weight of the total pigment and an adhesive in an amount of 10 to 20% by weight based on the total pigment. The inner pigment coating layer further comprises calcium carbonate having an average particle diameter of 0.1 to 1.0 μm as a pigment in an amount of 80 to 100% by weight of all pigments, and an adhesive of 10% by weight or less based on all pigments. 30 to 100% by weight of the calcium carbonate in the printing coated paper and the outer pigment coated layer contained so that the average particle diameter is 0.3 to 1.5 μm.
m is a light calcium carbonate, and the coated paper further has a pigment coated layer containing a pigment and an adhesive as a main component on at least one side of the base paper. The outer pigment coating layer is composed of at least two layers of an outer pigment coating layer and an inner pigment coating layer adjacent to the base paper surface adjacent to the outer pigment coating layer. The average pore diameter R O (μm) of the outer pigment coating layer determined by observing the cross section of the coated paper And the average void diameter R I (μ
relationship m) is a coated paper for printing, which is a 0.1R O ≦ R I ≦ 0.95R O .

【０００９】[0009]

【発明の実施の形態】本発明では、印刷用塗被紙とし
て、水銀圧入法で測定される顔料塗被層の空隙構造やブ
リストー試験法で測定する吸液特性が特定範囲であるこ
とが重要な要素である。以下に、それら特定の試験方法
を説明すると同時に、それらを特定範囲に規定すること
の意義、効果などについて詳述する。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, it is important that the coated paper for printing has a specific range of the pore structure of a pigment coating layer measured by a mercury intrusion method and a liquid absorption characteristic measured by a Bristow test method. Element. Hereinafter, the specific test methods will be described, and at the same time, the significance and effects of defining them in a specific range will be described in detail.

【００１０】先ず、水銀圧入法とは、水銀ポロシメトリ
ーとも呼ばれ、耐火物４１巻、６号２９７〜３０３頁、
１９８９年に述べられているように多孔質体の空隙構造
（空隙径や空隙容積）を測定するのに広く用いられてい
る。その原理は、水銀は表面張力が大きく、圧力をかけ
ないと多孔質体の空隙に進入できないことを利用してい
る。即ち、水銀の表面張力を０．４８０（Ｎ／ｍ）、多
孔質体との接触角１４０°を用いて、水銀に加わる圧力
とそのときに水銀が侵入できる空隙径は下記の（１）式
で示される。 Ｄ＝−４σｃｏｓθ／Ｐ （１） ここで、Ｄは空隙の直径（ｍ）、σは水銀の表面張力
（Ｎ／ｍ）、Ｐは水銀に加えられた圧力（Ｐａ）、θは
水銀と多孔質体、即ち、水銀と塗被紙の接触角（°）を
示すものである。上記原理を利用して空隙分布を求める
には、水銀に加える圧力Ｐを徐々に変化させ、そのとき
に空隙に侵入した水銀の体積Ｖを測定して、水銀の圧力
Ｐと水銀の侵入量Ｖの関係を描き、この曲線の微分係数
（ｄＶ／ｄＰ）を求めて縦軸とし、（１）式にしたがっ
て圧力Ｐを空隙の直径（本願では、単に空隙径と記載）
に換算したものを横軸にすることで求めることができ
る。First, the mercury intrusion method, also called mercury porosimetry, is described in Refractory Volume 41, No. 6, pp. 297-303,
As described in 1989, it is widely used to measure the void structure (void diameter and void volume) of a porous body. The principle makes use of the fact that mercury has a large surface tension and cannot enter the pores of a porous body without applying pressure. That is, using a surface tension of mercury of 0.480 (N / m) and a contact angle of 140 ° with the porous body, the pressure applied to mercury and the pore diameter at which mercury can enter at that time are expressed by the following formula (1). Indicated by D = -4σ cos θ / P (1) where D is the diameter of the void (m), σ is the surface tension of mercury (N / m), P is the pressure applied to mercury (Pa), and θ is It shows the contact angle (°) between the material, that is, mercury and the coated paper. In order to obtain the void distribution using the above principle, the pressure P applied to mercury is gradually changed, and the volume V of mercury that has entered the void at that time is measured. , The differential coefficient (dV / dP) of this curve is calculated and set as the vertical axis, and the pressure P is defined as the diameter of the gap according to the equation (1).
Can be obtained by plotting the converted value on the horizontal axis.

【００１１】水銀圧入法によって、塗被紙の空隙分布を
求めると、通常２つのピークを持つチャート（曲線）が
得られることが多い。その１つは０．５μｍ〜３０μｍ
程度の空隙径範囲にピークを有する空隙分布であり、他
のひとつは０．５μｍ程度以下の範囲にピークを有する
空隙分布である。空隙径の大きな前者の分布が塗被紙の
原紙に由来するもの、空隙径の小さな分布が顔料塗被層
に由来するものであることが知られている。ただし、塗
被紙によっては、顔料塗被層由来の明確なピークが現れ
ないものもある。また、顔料塗被層由来と原紙由来の空
隙分布は０．５μｍ付近で重なっていることも知られて
いる。そこで、本発明では顔料塗被層由来の空隙を０．
０３〜０．４μｍの径を有するものとして、この範囲に
おける空隙構造（累積空隙容積と平均空隙径）と塗被紙
の印刷仕上り、印刷適性や印刷作業における生産性との
関係について鋭意検討、研究を重ねた。When the void distribution of a coated paper is determined by the mercury intrusion method, a chart (curve) having two peaks is usually obtained in many cases. One of them is 0.5m-30m
Is a void distribution having a peak in a void diameter range of about 0.5 μm, and the other is a void distribution having a peak in a range of about 0.5 μm or less. It is known that the former distribution having a large void diameter is derived from the base paper of the coated paper, and the distribution having a small void diameter is derived from the pigment coated layer. However, in some coated papers, a clear peak derived from the pigment coated layer does not appear. It is also known that the void distributions derived from the pigment coating layer and the base paper overlap at around 0.5 μm. Therefore, in the present invention, the voids derived from the pigment coating layer are reduced to 0.
Assuming a diameter of 03 to 0.4 μm, the relationship between the void structure (cumulative void volume and average void diameter) in this range, the print finish of the coated paper, printability, and productivity in the printing operation is intensively studied. Was piled up.

【００１２】なお、本発明で、水銀圧入法によって測定
する塗被紙の空隙構造で、顔料塗被層由来とみなして求
める空隙径０．０３〜０．４μｍの範囲の空隙における
累積空隙容積は、測定しようとする塗被紙を２０℃、６
５ＲＨ％で調湿してその米坪と測定に供する試料の重量
を測定し、水銀圧入法で得られた累積空隙容積を測定に
供した試料重量で除して塗被紙の単位重量当りの累積容
積とし、さらに、これに塗被紙の米坪を乗じて塗被紙の
単位面積当りの累積容積（単位：ｍｌ／ｍ2）とした。
また、測定に供した塗被紙が両面塗被紙であって、その
両面がほぼ同等の特性を示す場合、上記で得られた単位
面積当りの累積容積を１／２倍して累積空隙容積として
示した。したがって、本発明で特定する累積空隙容積は
片面当たりの顔料塗被層に相当するものである。因み
に、両面塗被紙であって、それぞれの面の特性が大きく
異なる場合は、塗被紙を２層に分割して測定に供した。
また、平均空隙径とは対象空隙径範囲０．０３〜０．４
μｍの範囲の空隙累積容積を１００％として、空隙径の
大きい方から累積して累積容積が５０％となるときに対
応する空隙径を指す。In the present invention, the cumulative pore volume in the pore structure having a pore diameter in the range of 0.03 to 0.4 μm determined as being derived from the pigment coated layer in the pore structure of the coated paper measured by the mercury intrusion method is as follows. , The coated paper to be measured at 20 ° C, 6
The humidity of the sample was adjusted to 5 RH%, the rice tsubo was measured, and the weight of the sample to be measured was measured. The cumulative void volume obtained by the mercury intrusion method was divided by the weight of the sample to be measured, and the weight per unit weight of the coated paper was measured. The cumulative volume was further multiplied by the rice tsubo of the coated paper to obtain the cumulative volume per unit area of the coated paper (unit: ml / m 2 ).
When the coated paper subjected to the measurement is a double-sided coated paper and both sides show almost the same characteristics, the cumulative volume per unit area obtained above is multiplied by １ ／ to calculate the cumulative void volume. As shown. Therefore, the cumulative void volume specified in the present invention corresponds to the pigment coating layer per one side. By the way, in the case of a double-sided coated paper, when the characteristics of each side are greatly different, the coated paper was divided into two layers and subjected to the measurement.
In addition, the average gap diameter is a target gap diameter range of 0.03 to 0.4.
Assuming that the cumulative void volume in the range of μm is 100%, the cumulative void volume indicates a void diameter corresponding to a cumulative void volume of 50% when the cumulative void volume becomes 50%.

【００１３】顔料塗被層の空隙（本発明では塗被紙の
０．０３〜０．４μｍの範囲の空隙とした）は、塗被紙
のインキセット性やインキ乾燥性、さらには印刷光沢発
現性に大きく影響している。先ず、塗被紙上に転移した
インキがセットし、その後短時間で乾燥するには、塗被
紙が上記範囲の空隙の累積容積として４．０〜１０ｍｌ
／ｍ2有していることが必要である。因みに、上記範囲
の空隙の累積容積が４．０ｍｌ／ｍ2未満の場合には、
塗被紙がインキ中の溶剤を十分に吸収することができ
ず、インキセットが遅くなるのみならず、インキの乾燥
も遅くなり本発明が目的とする印刷作業における高い生
産性を与え得る印刷用塗被紙を得ることができない。一
方、累積容積が１０ｍｌ／ｍ2を超えると印刷光沢が低
下する虞れがあり、好ましくない。The voids in the pigment coated layer (in the present invention, the voids in the range of 0.03 to 0.4 μm of the coated paper) are used for setting the ink setting and ink drying properties of the coated paper, and further exhibiting the printing gloss. It has a significant effect on sex. First, to set the transferred ink on the coated paper and then dry it in a short time, the coated paper should have a cumulative volume of voids in the above range of 4.0 to 10 ml.
/ M 2 . Incidentally, when the cumulative volume of voids in the above range is less than 4.0 ml / m 2 ,
The coated paper cannot sufficiently absorb the solvent in the ink, which not only slows down the ink setting, but also slows down the drying of the ink, thereby providing high productivity in the printing operation aimed at by the present invention. Unable to get coated paper. On the other hand, if the cumulative volume exceeds 10 ml / m 2 , the print gloss may decrease, which is not preferable.

【００１４】なお、ここで、本発明者らは、インキのセ
ットとインキの乾燥の現象、さらには、これらに影響す
るインキや用紙のインキセット性、インキ乾燥性を、次
のように使い分けているので、以下に簡単に補足説明を
する。オフセット枚葉印刷で使用されるインキは、顔
料、樹脂、溶剤（通常、石油系溶剤）および植物油を主
要な成分としている。そして、該インキが塗被紙上に転
移すると、先ずインキ中の溶剤が顔料塗被層中の空隙に
選択的に吸収される。インキ中の溶剤が吸収されると塗
被紙上のインキの粘度が急激に上昇し、指などで触れて
も、もはやベトつかない状態となる。この現象をインキ
がセットしたという。即ち、塗被紙のインキセット性が
速いということは、塗被紙がインキ中の溶剤の吸収能力
が高いことを示すものである。Here, the present inventors use the ink setting and ink drying phenomena, as well as the ink setting and ink drying properties of the ink and paper, which affect these, as follows. The following is a brief supplementary explanation. Inks used in offset sheet-fed printing mainly include pigments, resins, solvents (usually petroleum solvents), and vegetable oils. Then, when the ink is transferred onto the coated paper, the solvent in the ink is first selectively absorbed into the voids in the pigment coated layer. When the solvent in the ink is absorbed, the viscosity of the ink on the coated paper sharply rises, so that the ink no longer sticks when touched with a finger or the like. This phenomenon is called ink setting. That is, the fast ink setting property of the coated paper indicates that the coated paper has a high ability to absorb the solvent in the ink.

【００１５】上述の如くセットしたインキは、空気中の
酸素とインキ中の植物油が反応して乾燥する。ここでい
う植物油とは、乾性油あるいは半乾性油と呼ばれる分子
内に２重結合を有する油であり、空気中の酸素と反応し
て高分子化し、強固な乾燥皮膜を形成することで、多少
の外力が加わってもインキ皮膜が剥がれたり傷ついたり
しなくなる。このようなインキの状態をインキが乾燥す
るという。そして、インキが乾燥するためには、先ずイ
ンキ中の溶剤が紙に吸収されることが必要で、インキが
溶剤を含んだままでは、空気と接触してもすぐには乾燥
しないようになっている。このことは、印刷機械上（例
えば、インキローラ上、ブランケット上や刷版上など）
では、あまりインキが乾かないことを示している。な
お、インキセットや乾燥に関連して触れなかったが、イ
ンキ中の樹脂は溶剤に溶解しており、溶剤が紙に吸収さ
れると一部は溶剤とともに紙中に浸透するが、殆どは紙
表面上に析出するような状態で留まり、上記植物油とと
もにインキの乾燥皮膜形成に寄与するものである。In the ink set as described above, the oxygen in the air and the vegetable oil in the ink react to dry. Vegetable oil as used herein is an oil that has a double bond in the molecule called a drying oil or a semi-drying oil. It reacts with oxygen in the air to polymerize and form a strong dry film. Even if an external force is applied, the ink film will not peel or be damaged. Such a state of the ink is referred to as drying of the ink. In order for the ink to dry, the solvent in the ink must first be absorbed by the paper. If the ink contains the solvent, it will not dry immediately even if it comes into contact with air. I have. This can be done on a printing press (eg, on an ink roller, on a blanket, on a plate, etc.).
Shows that the ink does not dry very much. Although I did not touch on the ink setting and drying, the resin in the ink was dissolved in the solvent, and when the solvent was absorbed by the paper, a part of the resin penetrated into the paper together with the solvent. It remains in such a state as to precipitate on the surface and contributes to the formation of a dry film of the ink together with the vegetable oil.

【００１６】次いで、塗被紙上に転移したインキが迅速
にセットし、その後短時間で乾燥するためには、印刷用
塗被紙の空隙径０．０３〜０．４μｍの範囲の空隙にお
ける平均空隙径が、０．０４〜０．２μｍの範囲にある
ことが必要である。これは、迅速なインキのセットおよ
びその後のインキの乾燥には、前記した顔料塗被層の累
積空隙容積が一定量以上存在することが必要であるが、
これだけでは不十分であり、さらに、その平均空隙径が
特定範囲にあることが必要なことを示すものである。特
に平均空隙径が０．０４〜０．２μｍの範囲にあるとイ
ンキ中の溶剤を選択的に吸収する能力が高く、インキの
セットを迅速に進めることができ、その後のインキの乾
燥も速くなるものである。一方、印刷用塗被紙の空隙径
０．０３〜０．４μｍの範囲の空隙における平均空隙径
が、０．０４〜０．２μｍの範囲を外れる場合は、イン
キ中の溶剤を選択的に吸収する能力が劣り、インキセッ
トが遅くなり、その結果インキの乾燥も遅くなるため、
本発明が目的とする印刷作業における高い生産性を与え
る印刷用塗被紙とすることができない。Next, in order to quickly set the transferred ink on the coated paper and then dry it in a short time, it is necessary to use an average void in a void having a void diameter of 0.03 to 0.4 μm in the coated paper for printing. The diameter needs to be in the range of 0.04 to 0.2 μm. This is because the rapid setting of the ink and the subsequent drying of the ink require that the cumulative void volume of the pigment coating layer be present in a certain amount or more.
This alone is not sufficient, and indicates that the average void diameter needs to be within a specific range. In particular, when the average pore diameter is in the range of 0.04 to 0.2 μm, the ability to selectively absorb the solvent in the ink is high, and the setting of the ink can proceed quickly, and the subsequent drying of the ink also becomes faster. Things. On the other hand, when the average void diameter in the voids of the coated paper for printing in the void diameter range of 0.03 to 0.4 μm is out of the range of 0.04 to 0.2 μm, the solvent in the ink is selectively absorbed. The ink setting is slow and the ink drying is slow
The present invention cannot provide a coated paper for printing that provides high productivity in the printing operation targeted by the present invention.

【００１７】本発明者らは、印刷用塗被紙の空隙構造と
印刷光沢の発現性や印刷適性との関係を精査した結果、
上記した累積空隙容積や平均空隙径だけでは、十分に説
明できない現象があり、さらに検討を重ねた。その結
果、印刷用塗被紙（顔料塗被層）の空隙構造に加えて、
インキ中の溶剤を想定した特定のオイルを評価液として
用いたブリストー試験法によって測定した吸収係数Ｋａ
を特定範囲にすることで、印刷物に高い印刷光沢を与
え、かつ良好な印刷適性を有し、さらには印刷作業にお
ける高い生産性を与え得る印刷用塗被紙の開発に初めて
成功した。The present inventors have scrutinized the relationship between the void structure of the coated paper for printing and the development of print gloss and printability.
There are phenomena that cannot be sufficiently explained by the above-mentioned cumulative void volume and average void diameter alone, and further studies have been made. As a result, in addition to the void structure of the printing coated paper (pigment coated layer),
Absorption coefficient Ka measured by the Bristow test method using a specific oil as an evaluation liquid assuming a solvent in the ink
By setting the specific range of 与 え, a printed coated paper having high print gloss and good printability and high productivity in a printing operation was successfully developed for the first time.

【００１８】即ち、上記水銀圧入法によって特定した空
隙構造は、顔料塗被層全体の空隙構造を特定するもの
で、インキが最初に接触する外側顔料塗被層（最外層）
の表面領域だけをなんら特定しているものではない。そ
のため、本発明では水銀圧入法で印刷用塗被紙の顔料塗
被層全体の空隙構造を特定するとともに、ブリストー試
験法による吸収係数Ｋａで顔料塗被層の表面領域の状態
を特定したものである。具体的に述べると、本発明の印
刷用塗被紙について、上記水銀圧入法による特定の空隙
構造を有することに加えて、ブリストー試験機を使用し
てＪＩＳ Ｚ８８０９−１９９２に規定される標準粘度
オイル（ＪＳ２．５）を評価液に用いて測定した吸収係
数Ｋａを０．３５〜１．５ｍｌ／（ｍ2・ｍｓ1/2）に維
持することが、本発明が所望とする印刷物に高い印刷光
沢と印刷作業における高い生産性を与え得る印刷用塗被
紙を得るために必要な要件である。That is, the void structure specified by the mercury intrusion method specifies the void structure of the entire pigment coating layer, and the outer pigment coating layer (outermost layer) to which the ink contacts first.
It does not specify only the surface area of. Therefore, in the present invention, the pore structure of the entire pigment coated layer of the printing coated paper is specified by the mercury intrusion method, and the state of the surface area of the pigment coated layer is specified by the absorption coefficient Ka by the Bristow test method. is there. More specifically, the coated paper for printing of the present invention has a specific void structure according to the mercury intrusion method and a standard viscosity oil specified in JIS Z8809-1992 using a Bristow tester. Maintaining an absorption coefficient Ka measured using (JS2.5) as an evaluation solution at 0.35 to 1.5 ml / (m 2 · ms 1/2 ) is a high print quality desired by the present invention. This is a necessary requirement to obtain a coated printing paper that can provide gloss and high productivity in the printing operation.

【００１９】ここに、ブリストー試験機による吸収係数
は、Ｊ．ＴＡＰＰＩ 紙パルプ試験方法Ｎｏ５１に準拠
して測定される。ただし、本発明では、インキ中の溶剤
を代用するために、ＪＩＳ Ｚ８８０９−１９９２に規
定される標準粘度オイル（ＪＳ２．５）を評価液として
使用した。因みに、上記の標準粘度オイルＪＳ２．５は
粘度測定上ニュートンフローを示す炭化水素系の油であ
り、２０℃で２ｍＰａ・ｓの粘度を有するものである。
そして、測定の概要は、ヘッドボックスに一定量の評価
液を入れ、回転可能な円盤の周囲に貼り付けた紙に、評
価液を転移させてその転移長さを求めることを、円盤の
回転速度を変えて行うことで、評価液と紙の特定接触時
間における一定面積当りの転移量を求めることができ
る。評価液と紙の接触時間Ｔ（ミリ秒）の平方根と、評
価液の転移量Ｖ（ｍｌ／ｍ2）との関係は、ある接触時
間範囲において直線関係となりこの直線の傾きを吸収係
数Ｋａとする。本発明では、接触時間１９８〜１９９８
ミリ秒の間で得られた直線の傾きから吸収係数Ｋａを求
めた。The absorption coefficient measured by the Bristow tester is described in J. TAPPI is measured in accordance with paper pulp test method No. 51. However, in the present invention, in order to substitute the solvent in the ink, a standard viscosity oil (JS2.5) specified in JIS Z8809-192 was used as the evaluation liquid. Incidentally, the above-mentioned standard viscosity oil JS2.5 is a hydrocarbon-based oil exhibiting Newton's flow in viscosity measurement, and has a viscosity of 2 mPa · s at 20 ° C.
The outline of the measurement is that a certain amount of the evaluation liquid is put in the head box, and the evaluation liquid is transferred to paper pasted around a rotatable disk to determine the transfer length. The amount of transfer per fixed area during the specific contact time between the evaluation liquid and the paper can be determined by changing. The relationship between the square root of the contact time T (millisecond) between the evaluation liquid and the paper and the transfer amount V (ml / m 2 ) of the evaluation liquid becomes a linear relationship in a certain contact time range, and the slope of this line is defined as the absorption coefficient Ka. I do. In the present invention, the contact time is 198 to 1998.
The absorption coefficient Ka was determined from the slope of the straight line obtained during the millisecond.

【００２０】一方、液体の多孔質体への浸透は、Ｌｕｃ
ａｓ−Ｗａｓｈｂｕｒｎの浸透の式、即ち、下記の
（２）式で表される。 ｈ＝（γｃｏｓθ・ｒｔ／２η）1/2 （２） ここで、ｈ：浸透深さ、γ：液体の表面張力、ｃｏｓ
θ：多孔質体（塗被紙）と液体との接触角、ｒ：多孔質
体の空隙径、ｔ：浸透時間、η：液体の粘度である。 ブリストー試験法で求めた吸収係数Ｋａは、（２）式に
おいて、浸透時間の平方根をパラメータとしたときの係
数に一致し、下記の（３）式で表される。 Ｋａ＝（γｃｏｓθ・ｒ／２η）1/2 （３） このことは、吸収係数Ｋａは、ブリストー試験で評価液
が同じで、また、その液体が紙を十分に濡らす場合、Ｋ
ａは紙の空隙径によってほぼ決まり、空隙径が大きいほ
ど吸収係数Ｋａが大きくなることを示す。On the other hand, the penetration of the liquid into the porous body is caused by Luc
The as-Washburn penetration formula, that is, the following formula (2) is used. h = (γ cos θ · rt / 2η) 1/2 (2) where h: penetration depth, γ: surface tension of liquid, cos
θ: contact angle between the porous body (coated paper) and the liquid, r: pore diameter of the porous body, t: penetration time, η: viscosity of the liquid. The absorption coefficient Ka obtained by the Bristow test method matches the coefficient when the square root of the permeation time is used as a parameter in the equation (2), and is expressed by the following equation (3). Ka = (γ cos θ · r / 2η) 1/2 (3) This indicates that the absorption coefficient Ka is the same as that of the evaluation liquid in the Bristow test, and that the liquid sufficiently wets the paper.
a is determined substantially by the pore diameter of the paper, and indicates that the larger the pore diameter, the larger the absorption coefficient Ka.

【００２１】即ち、本発明では、ＪＩＳ Ｚ８８０９−
１９９２に規定される標準粘度オイル（ＪＳ２．５）を
評価液に使用して測定した塗被紙の吸収係数Ｋａが０．
３５〜１．５ｍｌ／（ｍ2・ｍｓ1/2）となるように調整
することが必要である。換言すると、吸収係数に大きく
影響する顔料塗被層の表面領域の空隙径がある程度大き
いことが必要であることを示している。That is, according to the present invention, JIS Z8809-
The absorption coefficient Ka of a coated paper measured using a standard viscosity oil (JS2.5) specified in 1992 as an evaluation liquid was 0.1.
It is necessary to adjust so as to be 35 to 1.5 ml / (m 2 · ms 1/2 ). In other words, it indicates that it is necessary that the pore diameter in the surface region of the pigment coating layer, which greatly affects the absorption coefficient, be large to some extent.

【００２２】以上より、本発明によって特定される印刷
用塗被紙の顔料塗被層の構造をまとめて説明すると以下
のようになる。本発明では、水銀圧入法によって測定し
た印刷用塗被紙の空隙径０．０３〜０．４μｍの範囲の
空隙における累積空隙容積と平均空隙径が各々４．０〜
１０ｍｌ／ｍ2と０．０４〜０．２μｍの範囲にあっ
て、さらに、該塗被紙のブリストー試験機を使用してＪ
ＩＳ Ｚ８８０９−１９９２に規定される標準粘度オイ
ル（ＪＳ２．５）を評価液として用いて測定した吸収係
数Ｋａが０．３５〜１．５ｍｌ／（ｍ2・ｍｓ1/2）とな
るように規定したことを特徴とするものである。このよ
うな特定により、顔料塗被層の空隙容積が十分あるこ
と、顔料塗被層全体の空隙径（平均空隙径）はある程
度小さいこと、そして顔料塗被層の表面領域の空隙径
がある程度大きいことを意味するものである。As described above, the structure of the pigment coating layer of the coated printing paper specified by the present invention will be described as follows. In the present invention, the cumulative void volume and the average void diameter in the voids having a void diameter in the range of 0.03 to 0.4 μm of the coated printing paper measured by the mercury intrusion method are 4.0 to 4.0, respectively.
10 ml / m 2 and in the range of 0.04 to 0.2 μm.
It is specified so that the absorption coefficient Ka measured using a standard viscosity oil (JS2.5) specified in IS Z8809-192 as an evaluation liquid is 0.35 to 1.5 ml / (m 2 · ms 1/2 ). It is characterized by having done. By such a specification, the pore volume of the pigment coating layer is sufficient, the pore diameter (average pore diameter) of the entire pigment coating layer is small to some extent, and the pore diameter of the surface area of the pigment coating layer is large to some extent. It means that.

【００２３】そして、塗被紙が迅速なインキセット性お
よび迅速なインキ乾燥性を有しているためには、塗被紙
を構成する顔料塗被層がインキ中の溶剤を十分に吸収で
きるだけの空隙容積を有していることと、他方でその顔
料塗被層全体を平均した空隙径がある程度小さいことが
必要である。本発明では、さらに顔料塗被層の表面領域
の空隙径が大きい（ブリストー試験で得られる吸収係数
が大きい）構造とすることで、初めて高い印刷光沢が得
られるものである。In order for the coated paper to have a quick ink setting property and a quick ink drying property, the pigment coating layer constituting the coated paper must be capable of absorbing the solvent in the ink sufficiently. It is necessary to have a void volume and, on the other hand, it is necessary that the average pore diameter of the entire pigment coating layer is small to some extent. In the present invention, high print gloss can be obtained for the first time by adopting a structure in which the void diameter in the surface region of the pigment coating layer is large (the absorption coefficient obtained by the Bristow test is large).

【００２４】因みに、ブリストー試験法における吸収係
数Ｋａが０．３５ｍｌ／（ｍ2・ｍｓ1/2）未満、換言す
ると顔料塗被層の表面領域の空隙径が小さ過ぎる場合に
は、塗被紙上に転移したインキは、転移直後からインキ
中の溶剤が顔料塗被層中に選択的に吸収され、インキが
塗被紙上に転移する際に生じるスプリットパターンを解
消する時間的余裕がなくインキがセットしてしまう。そ
の結果、印刷光沢が低くなる。ただし、顔料塗被層の表
面領域の空隙径がさらに小さいか表面領域の空隙がない
場合にはインキはセットせず、結果的にそのような印刷
用塗被紙は印刷作業における高い生産性を付加させるこ
とができない。Incidentally, when the absorption coefficient Ka in the Bristow test method is less than 0.35 ml / (m 2 · ms 1/2 ), in other words, when the void diameter in the surface region of the pigment coating layer is too small, the coated paper is Immediately after the transfer, the solvent in the ink is selectively absorbed into the pigment coating layer immediately after the transfer, and there is no time to resolve the split pattern that occurs when the ink transfers to the coated paper. Resulting in. As a result, the print gloss decreases. However, if the pore diameter in the surface area of the pigment coating layer is smaller or there is no void in the surface area, no ink is set, and as a result, such a printing coated paper has high productivity in the printing operation. Cannot be added.

【００２５】他方、本発明ではブリストー試験による吸
収係数Ｋａが０．３５〜１．５ｍｌ／（ｍ2 ・ｍ
ｓ1/2）となるように特定しているものであり、これは
顔料塗被層の表面領域の空隙径がある程度大きいことを
意味し、インキが塗被紙上に転移されてもすぐにインキ
のセットが始まらず、塗被紙上にインキが転移する際に
生じたスプリットパターンを解消する時間的余裕が生じ
る結果、印刷光沢が高くなると推定している。即ち、空
隙径が大きい顔料塗被層の表面領域は、インキ中の溶剤
成分だけを選択的に吸収しようとする効果が小さく、そ
の大きな空隙にはインキそのものが浸透し、その後顔料
塗被層内部の小さな空隙にインキが浸透するまでインキ
がセットしないと考えられ、この場合、顔料塗被層の表
面領域はインキセット遅延の役割を果たしているといえ
る。On the other hand, in the present invention, the absorption coefficient Ka by the Bristow test is 0.35 to 1.5 ml / (m 2 · m
s 1/2 ), which means that the pore diameter in the surface area of the pigment coated layer is somewhat large, and the ink is transferred immediately onto the coated paper. It is presumed that the print gloss will be increased as a result of the time setting to cancel the split pattern generated when the ink is transferred onto the coated paper without starting the setting. In other words, the surface area of the pigment coating layer having a large pore diameter has a small effect of selectively absorbing only the solvent component in the ink, and the ink itself penetrates into the large pores, and then the inside of the pigment coating layer is removed. It is considered that the ink is not set until the ink penetrates into the small voids, and in this case, the surface area of the pigment coating layer plays a role of the ink setting delay.

【００２６】さらに、このような顔料塗被層を有する印
刷用塗被紙が、両面機で使用された場合、先印刷面のイ
ンキのセットが殆ど始まらない間に、両面の印刷を終了
することができるので、先印刷面のインキが圧胴に取ら
れて蓄積したり、先印刷面の図柄に欠点が生じたりする
ことがなく、両面機での良好な印刷適性が付与されるの
である。因みに、吸収係数Ｋａが１．５ｍｌ／（ｍ2 ・
ｍｓ1/2）を超える場合には、印刷後の所謂ドライダウ
ン（印刷濃度の低下など）が大きくなる虞れがあり、好
ましくない。Further, when the printing coated paper having such a pigment coated layer is used in a duplex machine, the printing on both sides is completed while the setting of the ink on the pre-printed surface hardly starts. As a result, the ink on the preprinted surface is not taken up and accumulated on the impression cylinder, and the design on the preprinted surface does not have defects, and good printability with a duplex machine is provided. Incidentally, the absorption coefficient Ka is 1.5 ml / (m 2.
(ms 1/2 ), the so-called dry-down after printing (such as a decrease in print density) may be undesirably increased.

【００２７】そして、本発明における印刷用塗被紙の顔
料塗被層の表面領域は、所謂インキセット遅延層となっ
ているが、その内部は小さな空隙径の空隙を多数有して
おり、一旦、インキがこの内部空隙に達したならば、イ
ンキのセットが急激に始まり、続いてインキの乾燥も始
まる結果、片面機では短時間の放置時間で反転印刷が可
能となり、両面機では印刷終了後、短時間で次の後加工
に移すことができ、印刷作業における高い生産性をあげ
ることができる。特に、両面を印刷する印刷作業におけ
る高い生産性は、上述のような特性の顔料塗被層を原紙
の両面に有する両面塗被紙を使用することで顕著に発現
することができ、また該顔料塗被層面の王研式平滑度が
３００秒以上であると、より高い印刷光沢の印刷物が得
られやすく、好ましい実施態様である。The surface area of the pigment coating layer of the printing coated paper according to the present invention is a so-called ink setting delay layer, and the inside thereof has a large number of small-sized voids. When the ink reaches this internal space, the ink setting starts abruptly, followed by drying of the ink. As a result, the reverse printing can be performed in a short time with a simplex machine, and after the printing is completed with a duplex machine. It is possible to move to the next post-processing in a short time, and to increase the productivity in the printing operation. In particular, high productivity in the printing operation of printing on both sides can be remarkably exhibited by using a double-side coated paper having a pigment coated layer having the above-described characteristics on both sides of the base paper. When the Oken type smoothness of the coating layer surface is 300 seconds or more, a printed matter having higher print gloss is easily obtained, which is a preferred embodiment.

【００２８】本発明において、前記の如き水銀圧入法で
測定される顔料塗被層の空隙構造やブリストー試験法で
測定する吸液特性が特定範囲にある塗被紙は、顔料塗被
層を単層あるいは多層構造の何れで構成することもでき
る。例えば、単層の塗被層で構成する場合には、後に例
示するような顔料塗被層に使用する顔料や接着剤や原紙
を適宜選択する、あるいは、塗工後の顔料塗被液組成物
を乾燥する際の乾燥条件を調整することで、顔料塗被液
組成物中の接着剤成分が選択的に原紙中に吸収されるよ
うに調整するなどの方法で得ることができる。しかし、
一般には、顔料塗被層を、インキを直接受理する外側顔
料塗被層と、その外側顔料塗被層に隣接して原紙面に近
い内側顔料塗被層を含む2層以上の多層構造とするの
が、安定して所望の印刷用塗被紙が得られるため好まし
い。In the present invention, the coated paper having a specific range of the pore structure of the pigment coated layer measured by the mercury intrusion method and the liquid absorption characteristics measured by the Bristow test method as described above is used for the pigment coated layer. It can be composed of either a layer or a multilayer structure. For example, in the case of constituting a single coating layer, a pigment, an adhesive and a base paper used for the pigment coating layer as exemplified later are appropriately selected, or a pigment coating liquid composition after coating. By adjusting the drying conditions at the time of drying, the adhesive component in the pigment coating liquid composition can be adjusted to be selectively absorbed into the base paper. But,
Generally, the pigment coating layer has a multilayer structure of two or more layers including an outer pigment coating layer that directly receives ink and an inner pigment coating layer close to the base paper surface adjacent to the outer pigment coating layer. This is preferable since a desired coated paper for printing can be stably obtained.

【００２９】本発明者らは、顔料塗被層が多層構造を有
する印刷用塗被紙について、前記の如き水銀圧入法で測
定される顔料塗被層の空隙構造やブリストー試験法で測
定する吸収特性とは異なる指標で本発明が目的とする印
刷用塗被紙を規定できないか更に検討を重ねた。その結
果、原紙の少なくとも片面に、外側顔料塗被層とそれに
隣接する原紙面に近い内側顔料塗被層の少なくとも２層
の顔料塗被層を有する塗被紙において、該塗被紙の断面
観察より求めた外側顔料塗被層の平均空隙径ＲO（μ
ｍ）と内側顔料塗被層の平均空隙径ＲI（μｍ）の関係
が０．１ＲO≦ＲI≦０．９５ＲOを充足すると、印刷用
塗被紙として所望の性能を発揮することを見出した。The inventors of the present invention have reported that, for a printing coated paper having a multi-layered pigment coating layer, the void structure of the pigment coating layer measured by the mercury intrusion method as described above and the absorption measured by the Bristow test method. Further studies were conducted to determine whether the target coated paper of the present invention could be specified by an index different from the characteristics. As a result, in a coated paper having at least one pigment coated layer on at least one side of the base paper, an outer pigment coated layer and an inner pigment coated layer close to the base paper surface adjacent thereto, a cross-sectional observation of the coated paper is performed. Average void diameter R O (μ)
When the relationship of the mean m) and the inner pigment coating layer void diameter R I ([mu] m) to satisfy the 0.1R O ≦ R I ≦ 0.95R O , that exhibit the desired performance as a coated paper for printing I found it.

【００３０】なお、本発明において、断面観察より求め
た平均空隙径とは、以下の方法に従って算出したもので
ある。 『断面写真観察による外側および内側顔料塗被層の平均
空隙径測定』 断面調製 塗被紙サンプルを、ダイヤモンドナイフを用いたウルト
ラミクロトーム（ＬＫＢ社製，ＳＹＳＴＥＭ２１２８）
で切り出して断面切片を作成し、得られた切片の観察し
たい面に白金を10ｎｍ蒸着する。蒸着した切片を、ＦＩ
Ｂ（Focused Ion Beam／日立製作所製，ＦＢ２０００
Ａ型）でガリウムイオン源を用いて加速電圧３０ｋｖ
で、先ず粗加工（電流９ｎＡ、ビーム径３００ｎｍ）
し、さらに仕上げ加工（電流０．３ｎＡ、ビーム径３０
ｎｍ）処理して、ミクロトーム切り出しによるダーメー
ジ部分を除去した断面サンプルを得た。なお、ＦＩＢ処
理面積は、幅５００μｍ×高さ（紙の厚さ方向）１００
μｍ×深さ１０μｍである。In the present invention, the average pore diameter determined from cross-sectional observation is calculated according to the following method. "Measurement of average void diameter of outer and inner pigment coating layers by cross-sectional photograph observation" Cross-section preparation Coated paper samples were ultramicrotome using a diamond knife (SYSTEM2128, manufactured by LKB).
Then, a section is prepared by cutting out, and platinum is deposited to a thickness of 10 nm on the surface of the obtained section to be observed. The deposited sections are then removed by FI
B (Focused Ion Beam / FB2000 manufactured by Hitachi, Ltd.)
A type) using a gallium ion source and accelerating voltage 30 kv
First, rough processing (current 9 nA, beam diameter 300 nm)
And finish processing (current 0.3 nA, beam diameter 30)
nm) to obtain a cross-sectional sample from which the dermajee portion was removed by cutting out the microtome. Note that the FIB processing area is 100 μm in width × 100 in height (in the thickness direction of paper).
μm × 10 μm depth.

【００３１】ＦＥ−ＳＥＭ観察 上記方法で得た塗被紙の切片（断面）サンプルのＦＩＢ
処理面について、ＦＥ−ＳＥＭ（電界放射型走査電子顕
微鏡／日立製作所製，Ｓ−８００型）を使用して、加速
電圧５ｋｖで倍率１万倍の二次電子画像の写真を、場所
を変えて３枚撮影した。なお、外側顔料塗被層と内側顔
料塗被層を明確にするため、同時に反射電子画像も確認
した。FE-SEM observation FIB of section (cross section) sample of coated paper obtained by the above method
Using a FE-SEM (field emission scanning electron microscope / S-800, manufactured by Hitachi, Ltd.) for the treated surface, a photograph of a secondary electron image of 10,000 times magnification at an accelerating voltage of 5 kv was relocated. Three pictures were taken. In order to clarify the outer pigment coating layer and the inner pigment coating layer, a backscattered electron image was also confirmed at the same time.

【００３２】画像処理および平均空隙径の算出 上記１万倍の塗被紙断面写真それぞれを、イメージスキ
ャナーを使用して解像度４００ｄｐｉでパーソナルコン
ピュータに画像データとして取り込んだ。なお、取り込
み面積は、外側塗被層、内側塗被層をそれぞれ幅１００
μｍで、高さ（紙の厚み方向）は、外側塗被層、内側塗
被層の厚みに応じて適宜調整した。次いで、取り込んだ
画像データを、画像処理・解析システム（王子計測機器
社製，ドットアナライザーＤＡ−５０００型）を使用し
て自動２値化処理し、細孔面積から得られる円相当の細
孔径（細孔面積と同面積を有する円の直径）を算出し
た。なお、平均空隙径は、得られた空隙径範囲において
累積容積が５０％となるときに対応する空隙径をもって
示し、それぞれの写真から得られる平均空隙を平均し
た。Image Processing and Calculation of Average Void Diameter Each of the above 10,000-fold photographs of coated paper cross-sections was captured as image data in a personal computer at a resolution of 400 dpi using an image scanner. In addition, the take-in area is such that the outer coating layer and the inner coating
In μm, the height (in the thickness direction of the paper) was appropriately adjusted according to the thickness of the outer coating layer and the inner coating layer. Next, the captured image data is automatically binarized using an image processing / analysis system (manufactured by Oji Scientific Instruments, Dot Analyzer DA-5000), and a pore diameter equivalent to a circle obtained from a pore area ( The diameter of a circle having the same area as the pore area) was calculated. In addition, the average void diameter is indicated by the corresponding void diameter when the cumulative volume becomes 50% in the obtained void diameter range, and the average void obtained from each photograph is averaged.

【００３３】本発明では、上記の如く、断面観察により
求めた外側顔料塗被層の平均空隙径ＲO（μｍ）と内側
顔料塗被層の平均空隙径ＲI（μｍ）の関係が０．１ＲO
≦ＲI≦０．９５ＲOを満足することが必要である。因み
に、外側顔料塗被層の平均空隙径ＲOと内側顔料塗被層
の平均空隙径ＲIの関係が、ＲI＞０．９５ＲOあるいは
ＲI＜０．１ＲOである場合には、インキ中の溶剤成分が
外側顔料塗被層から続いて内側顔料塗被層まで浸透せず
に、外側顔料塗被層だけに留まる傾向となりインキセッ
トが遅くなるため、印刷作業における高い生産性を付加
させることができない。In the present invention, as described above, the relationship between the average pore diameter R O (μm) of the outer pigment coating layer and the average pore diameter R I (μm) of the inner pigment coating layer determined by cross-sectional observation is 0. 1R O
It is necessary to satisfy ≦ R I ≦ 0.95R O. By the way, when the relationship between the average void diameter R O of the outer pigment coating layer and the average void diameter R I of the inner pigment coating layer is R I > 0.95R O or R I <0.1R O , The solvent component in the ink does not penetrate from the outer pigment coating layer to the inner pigment coating layer, but tends to remain only in the outer pigment coating layer. This slows down the ink setting and adds high productivity in printing work. I can't let it.

【００３４】本発明において、前記の如き特定の特性を
有する印刷用塗被紙を安定的に得る手法は、既に説明し
たように、顔料塗被層を外側顔料塗被層と内側顔料塗被
層を含む2層以上の多層構造とする方法であるが、さら
に、それぞれの層を構成する主要材料である顔料や接着
剤の粒子径や使用割合を特定することで、所望の印刷用
塗被紙をより安定して得ることができる。In the present invention, a method for stably obtaining a printing coated paper having the above-mentioned specific characteristics is, as described above, a method of forming a pigment coated layer into an outer pigment coated layer and an inner pigment coated layer. Is a method of forming a multilayer structure of two or more layers including, further, by specifying the particle size and the use ratio of pigments and adhesives which are the main materials constituting each layer, the desired coated paper for printing Can be obtained more stably.

【００３５】具体的には、顔料塗被層が、外側顔料塗被
層とそれに隣接する原紙面に近い内側顔料塗被層の少な
くとも2層からなり、該外側顔料塗被層が、顔料として
炭酸カルシウムを全顔料の７０〜１００重量％、かつ接
着剤を全顔料に対して１０〜２０重量％含有し、さらに
該内側顔料塗被層が、顔料として平均粒子径０．１〜
１．０μｍの炭酸カルシウムを全顔料の８０〜１００重
量％、かつ接着剤を全顔料に対して１０重量％以下とな
るように含有せしめると、本発明の規定を満たす塗被紙
が容易かつ安定して得られるので好ましい。なお、本発
明で規定する平均粒子径は、凝集あるいは単粒子の集合
体状顔料の場合はその平均粒子径である。More specifically, the pigment coating layer is composed of at least two layers, an outer pigment coating layer and an inner pigment coating layer adjacent to the base paper surface adjacent to the outer pigment coating layer. The pigment contains 70 to 100% by weight of the total pigment and 10 to 20% by weight of the adhesive based on the total pigment, and the inner pigment coating layer has an average particle diameter of 0.1 to
When 1.0 μm of calcium carbonate is contained in an amount of 80 to 100% by weight of the total pigment and the adhesive is contained in an amount of 10% by weight or less based on the total pigment, a coated paper satisfying the requirements of the present invention can be easily and stably formed. It is preferable because it can be obtained. The average particle size specified in the present invention is the average particle size in the case of aggregated or single-particle aggregate pigments.

【００３６】即ち、本発明では、インキを受理する外側
顔料塗被層は、所謂インキセット遅延層としての作用を
狙ったものであり、炭酸カルシウムの含有量が全顔料の
７０重量％未満の場合、あるいは接着剤量が全顔料に対
して１０重量％未満の場合には、外側顔料塗被層がイン
キセット遅延層として作用せず、反対にインキセット促
進層として作用する虞れがあり、結果的に印刷光沢が低
下する虞れがある。他方、接着剤量が全顔料に対して２
０重量％を超えると、インキセットが遅くなり過ぎる傾
向となり、好ましくない。さらに、外側顔料塗被層に含
まれる炭酸カルシウムの内、その３０〜１００重量％を
平均粒子径が０．３〜１．５μｍの軽質炭酸カルシウム
とすることで、高い印刷光沢と良好なインキセット性、
即ち、印刷作業における高い生産性を高度にバランスで
きるのでより好ましい。その場合、軽質炭酸カルシウム
は、種々の形状があるが、本発明では、その粒子径が
０．３〜１．５μｍの範囲にあれば、特にその形状は問
わない。That is, in the present invention, the outer pigment coating layer for receiving ink is intended to function as a so-called ink setting delay layer, and the content of calcium carbonate is less than 70% by weight of the total pigment. If the amount of the adhesive is less than 10% by weight based on the total pigment, the outer pigment coating layer may not act as an ink setting delay layer, but may act as an ink setting accelerating layer. There is a possibility that the printing gloss may be reduced. On the other hand, when the amount of the adhesive is 2
If it exceeds 0% by weight, the ink setting tends to be too slow, which is not preferable. Further, by setting 30 to 100% by weight of the calcium carbonate contained in the outer pigment coating layer to be light calcium carbonate having an average particle diameter of 0.3 to 1.5 μm, a high printing gloss and a good ink set are obtained. sex,
That is, it is more preferable because high productivity in the printing operation can be highly balanced. In this case, the light calcium carbonate has various shapes. In the present invention, the shape is not particularly limited as long as the particle size is in the range of 0.3 to 1.5 μm.

【００３７】また、外側顔料塗被層に隣接する内側顔料
塗被層は、外側顔料塗被層がインキセット遅延層として
作用するのに対し、実質的にインキセットを受け持つた
めに、内側顔料塗被層が、顔料として平均粒子径が０．
１〜１．０μｍの炭酸カルシウムを全顔料の８０〜１０
０重量％、接着剤を全顔料に対して１０重量％以下とな
るように含有せしめることが好ましい。因みに、炭酸カ
ルシウムの平均粒子径が１．０μｍを超えたり、炭酸カ
ルシウムの配合量が８０重量％未満であったり、さらに
は接着剤量が１０重量％を越えると、十分なインキセッ
ト性を付与することができず、本発明が所望とする印刷
作業における高い生産性を与える印刷用塗被紙とするこ
とができない虞れがあり、他方、炭酸カルシウムの平均
粒子径が０．１μｍ未満の場合には、接着剤要求量が増
え、結果として塗被層の接着強度を十分に付与できない
虞れが生じる。The inner pigment coating layer adjacent to the outer pigment coating layer has an inner pigment coating layer for substantially covering the ink set while the outer pigment coating layer acts as an ink setting delay layer. The coating layer has a mean particle size of 0.1 as a pigment.
1 to 1.0 μm of calcium carbonate is added to 80 to 10 of the total pigment.
It is preferable to add 0% by weight and an adhesive so as to be 10% by weight or less based on all the pigments. By the way, if the average particle size of calcium carbonate exceeds 1.0 μm, if the amount of calcium carbonate is less than 80% by weight, or if the amount of adhesive exceeds 10% by weight, sufficient ink setting property is imparted. It may not be possible to obtain a coated paper for printing that provides high productivity in the printing operation desired by the present invention, while the average particle size of calcium carbonate is less than 0.1 μm. In this case, the required amount of the adhesive increases, and as a result, there is a possibility that the adhesive strength of the coating layer cannot be sufficiently provided.

【００３８】前記した外側顔料塗被層や内側顔料塗被層
の顔料としては、それぞれ、特定する炭酸カルシウムの
他に、カオリン、タルク、無定形シリカ、酸化亜鉛、酸
化アルミニウム、水酸化アルミニウム、サチンホワイ
ト、珪酸アルミニウム、珪酸マグネシウム、炭酸マグネ
シウム、プラスチックピグメントなどの塗被紙用の顔料
を適宜混合して使用することができる。As the pigments of the outer pigment coating layer and the inner pigment coating layer, kaolin, talc, amorphous silica, zinc oxide, aluminum oxide, aluminum hydroxide, and satin, in addition to the specified calcium carbonate, respectively. Pigments for coated paper such as white, aluminum silicate, magnesium silicate, magnesium carbonate, and plastic pigment can be appropriately mixed and used.

【００３９】また、外側顔料塗被層や内側顔料塗被層の
接着剤としては、水溶性接着として酸化澱粉やエステル
化澱粉などの各種澱粉類、カゼイン、大豆蛋白、合成蛋
白などの蛋白質類、カルボキシメチルセルロースやメチ
ルセルロースなどのセルロース誘導体、ポリビニルアル
コールやその変性品などを、また分散液系の接着剤とし
てスチレン−ブタジエン共重合体、メチルメタクリレー
ト−ブタジエン共重合体の共役ジエン系重合体ラテック
ス、アクリル系重合体ラテックス、エチレン−酢酸ビニ
ル共重合体などのビニル系重合体ラテックスなどを適宜
選択して使用することができる。なお、外側顔料塗被層
に使用する接着剤としては、前記した各種水溶性接着剤
や分散液系接着剤（重合体ラテックスエマルジョン）を
適宜選択して使用できるが、水溶性接着剤量は全顔料に
対して５重量％以下とすることが好ましく、さらに、分
散液系接着剤として分散粒子の平均粒子径が０．１２〜
０．３μｍのものを使用することが、高い印刷光沢と印
刷作業における高い生産性をより高度にバランスさせる
ことができるので好ましい。As the adhesive for the outer pigment coating layer and the inner pigment coating layer, various starches such as oxidized starch and esterified starch, proteins such as casein, soybean protein, and synthetic protein can be used as water-soluble adhesives. Cellulose derivatives such as carboxymethylcellulose and methylcellulose, polyvinyl alcohol and modified products thereof, and conjugated diene-based polymer latex of styrene-butadiene copolymer, methylmethacrylate-butadiene copolymer as a dispersion-based adhesive, acrylic-based A polymer latex, a vinyl polymer latex such as an ethylene-vinyl acetate copolymer, or the like can be appropriately selected and used. As the adhesive used for the outer pigment coating layer, any of the above-mentioned various water-soluble adhesives and dispersion-based adhesives (polymer latex emulsions) can be appropriately selected and used. The content is preferably 5% by weight or less with respect to the pigment, and the average particle size of the dispersed particles as a dispersion-based adhesive is 0.12 to
It is preferable to use one having a thickness of 0.3 μm because a high printing gloss and high productivity in a printing operation can be more highly balanced.

【００４０】さらに、内側顔料塗被層に使用する接着剤
としては、前記した水溶性接着剤はできるだけ少なくす
る方が好ましく、水溶性接着剤量は全顔料に対して、３
重量％以下とすることが特に好ましい。因みに、接着剤
量の下限については、印刷に供した際に十分な表面強度
が付与できるものであれば特に限定されるものではない
が、一般には全顔料に対して５重量％程度である。Further, as the adhesive used for the inner pigment coating layer, it is preferable that the amount of the above-mentioned water-soluble adhesive is as small as possible.
It is particularly preferred that the content be not more than% by weight. Incidentally, the lower limit of the amount of the adhesive is not particularly limited as long as it can impart sufficient surface strength when subjected to printing, but is generally about 5% by weight based on all pigments.

【００４１】本発明の印刷用塗被紙の製造方法について
は特に限定するものではない。原紙についても抄紙方法
や米坪の制限はなく、例えば米坪としては３０〜３００
ｇ／ｍ2程度であって、抄紙方法も酸性、中性〜アルカ
リ抄紙により製造された上質、中質、脱墨パルプ配合の
原紙を適宜使用することができる。さらには、顔料塗被
層を設ける前に原紙上に各種サイズプレス機およびロー
ルコーターなどで澱粉などの天然接着剤やポリビニルア
ルコールなどの合成接着剤を用いてサイズ処理を行った
り、顔料と接着剤を主成分とした塗被組成物をロールコ
ーターやブレードコーターなどで予備塗工したりするこ
とも可能である。また、塗工前の原紙をオンラインソフ
トカレンダなどで通紙処理して、予め平滑化しておくこ
とも塗工後の塗被層を均一にする意味で特に好ましい。The method for producing the coated printing paper of the present invention is not particularly limited. There is no limitation on the papermaking method or the rice tsubo for the base paper.
g / m 2 , and the papermaking method can be appropriately selected from high-quality, medium-quality, and deinked pulp-containing base paper produced by acidic, neutral to alkaline papermaking. Furthermore, before the pigment coating layer is provided, sizing is performed on the base paper using a natural adhesive such as starch or a synthetic adhesive such as polyvinyl alcohol using a size press or a roll coater, or a pigment and an adhesive. It is also possible to preliminarily apply a coating composition containing as a main component using a roll coater or a blade coater. In addition, it is particularly preferable that the base paper before coating is subjected to a paper passing process using an online soft calendar or the like and smoothed in advance in order to make the coating layer after coating uniform.

【００４２】かくして得られた原紙上に、すでに例示し
たような顔料と接着剤を主成分とする顔料塗被層用塗被
液を調製し、公知の方法で塗工、乾燥し、マシンカレン
ダー、スーパーカレンダー、グロスカレンダー、ソフト
カレンダー等の各種の方法で平滑化処理を施す。その際
に、王研式平滑度が３００秒以上となるように処理する
のが好ましいが、平滑度を高め過ぎると、前記した水銀
圧入法で測定する顔料塗被層の空隙構造およびブリスト
ー試験法で測定する吸液特性、あるいは断面観察により
求める空隙構造が本発明で特定する範囲を外れる虞れも
あるので、本発明では、王研式平滑度が３００〜１００
００秒の範囲となるように調整するのが望ましい。ま
た、顔料塗被層の塗工量についても特に限定するもので
はなく、顔料塗被層を単層で構成する場合は、通常、片
面当りの乾燥塗被量として５〜３５ｇ／ｍ2の範囲で調
整すればよい。一方、顔料塗被層を多層構造とする場合
は、印刷インキを受理する外側顔料塗被層とそれに隣接
する内側顔料塗被層の塗被量を、片面当りの乾燥塗被量
として、外側顔料塗被層の塗被量（Ａ）が２〜１５ｇ／
ｍ2、内側顔料塗被層の塗被量（Ｂ）が５〜２０ｇ／ｍ2
であって、かつＡとＢの関係がＡ≦Ｂとなるように塗工
すると、所望の効果を得る上で好ましい。なお、本発明
で得られた印刷用塗被紙は、オフセット印刷だけでな
く、粘度の低いインキを使用するフレキソ印刷やグラビ
ア印刷においても速いインキ乾燥性と良好な印刷仕上が
りを付与でき好適に使用できるものである。On the base paper thus obtained, a coating liquid for a pigment coating layer containing a pigment and an adhesive as main components as described above is prepared, coated and dried by a known method, A smoothing process is performed by various methods such as a super calendar, a gloss calendar, and a soft calendar. At that time, it is preferable to perform treatment so that the Oken type smoothness is 300 seconds or more. However, if the smoothness is too high, the void structure and the Bristow test method of the pigment coating layer measured by the mercury intrusion method described above. In the present invention, the Oken type smoothness may be 300 to 100, because the liquid absorption characteristics measured by the method described above or the void structure determined by cross-sectional observation may be out of the range specified in the present invention.
It is desirable to adjust so as to be within the range of 00 seconds. Also, the coating amount of the pigment coating layer is not particularly limited, and when the pigment coating layer is constituted by a single layer, the coating amount is usually in the range of 5 to 35 g / m 2 as a dry coating amount per one surface. It should be adjusted with. On the other hand, when the pigment coating layer has a multilayer structure, the coating amount of the outer pigment coating layer that receives the printing ink and the coating amount of the inner pigment coating layer adjacent thereto are defined as the dry coating amount per one side, and the outer pigment coating layer is used as the outer coating layer. The coating amount (A) of the coating layer is 2 to 15 g /
m 2 , the coating amount (B) of the inner pigment coating layer is 5 to 20 g / m 2
It is preferable to apply the coating so that the relationship between A and B satisfies A ≦ B in order to obtain a desired effect. The coated printing paper obtained according to the present invention can be used not only in offset printing but also in flexographic printing or gravure printing using a low-viscosity ink, because it can impart fast ink drying properties and a good print finish and can be suitably used. You can do it.

【００４３】[0043]

【実施例】以下に、実施例を挙げて本発明を具体的に説
明するが、勿論、本発明はそれら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。また、実施例や比
較例で使用した顔料やラテックスの粒子径は以下の方法
で測定した。EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but it is needless to say that the present invention is not limited thereto. Unless otherwise specified, parts and% in the examples indicate parts by weight and% by weight, respectively. The particle size of the pigment or latex used in the examples and comparative examples was measured by the following method.

【００４４】● 顔料の平均粒子径 ピロリン酸ソーダの０．１％液中に顔料を超音波で５分
間分散処理し、セディグラフ５１００（マイクロメリテ
ィクス社製）を用いて沈降法により測定した。平均粒子
径は粗粒子分からの累積重量が５０％に相当する点での
粒子径で示した。The average particle size of the pigment The pigment was dispersed in a 0.1% solution of sodium pyrophosphate with ultrasonic waves for 5 minutes, and measured by sedimentation using Sedigraph 5100 (Micromeritics). The average particle diameter is indicated by the particle diameter at a point where the cumulative weight from the coarse particle content corresponds to 50%.

【００４５】 ● 重合体ラテックス（分散液系接着剤）の平均粒子径 重合体ラテックスをオスミウム酸で処理し、これを透過
型電子顕微鏡で倍率５万倍で写真撮影し、得られた顕微
鏡写真の重合体ラテックス粒子の約２００個の粒子径を
測定し数平均で求めた。● Average particle size of polymer latex (dispersion adhesive) The polymer latex was treated with osmic acid, and photographed with a transmission electron microscope at a magnification of 50,000 times. The particle diameter of about 200 polymer latex particles was measured and determined by number average.

【００４６】実施例１ （原紙の製造）ＬＢＫＰ９０部（フリーネス４４０ｍｌ
／ｃｓｆ）、ＮＢＫＰ１０部（フリーネス５１０ｍｌ／
ｃｓｆ）からなるパルプスラリー中に、パルプ固形分に
対して填料として軽質炭酸カルシウムを紙灰分で１０％
となるように添加し、さらに内添サイズ剤としてＡＫＤ
サイズ剤（商品名：サイズパインＫ−９０２／荒川化学
工業社）０．０５％および硫酸アルミニウム０．５％を
それぞれ添加して紙料を調成した。このように調成され
た紙料を用いて、ハイブリッドタイプのツインワイヤ抄
紙機で抄紙、乾燥を行って成紙（基紙）を得た。次い
で、このようにして得られた基紙の両面に２本ロールサ
イズプレス装置を介して、６％濃度の酸化澱粉糊液（商
品名：エースＡ／王子コーンスターチ社）を両面固形分
換算で１．４ｇ／ｍ2となるように塗布、乾燥して米坪
が７５ｇ／ｍ2の原紙を得た。Example 1 (Production of base paper) 90 parts of LBKP (440 ml of freeness)
/ Csf), 10 parts of NBKP (freeness 510 ml /
In the pulp slurry consisting of csf), light calcium carbonate is added as a filler to the pulp solid content by 10% by paper ash.
And AKD as an internal sizing agent
A stock was prepared by adding 0.05% of a sizing agent (trade name: Size Pine K-902 / Arakawa Chemical Industry Co., Ltd.) and 0.5% of aluminum sulfate. Using the thus prepared stock, paper making and drying were performed with a hybrid type twin-wire paper machine to obtain a formed paper (base paper). Next, an oxidized starch paste solution (trade name: Ace A / Oji Cornstarch Co., Ltd.) having a concentration of 6% was applied to both sides of the base paper thus obtained via a two-roll size press device in terms of a solid content on both sides of 1%. It was applied to a thickness of 0.4 g / m 2 and dried to obtain a base paper having a rice tsubo of 75 g / m 2 .

【００４７】（外側顔料塗被層用塗被液の調製）平均粒
子径が０．２７μｍの軽質炭酸カルシウム（商品名：Ｔ
Ｐ−２２１ＧＳ／奥多摩工業社）４０部、平均粒子径
０．６μｍの重質炭酸カルシウム（商品名：ハイドロカ
ーブ９０／備北粉化工業社）４０部および微細カオリン
（商品名：ミラグロス／エンゲルハード社：米国）２０
部からなる顔料をコーレス分散機で水中に分散して顔料
スラリを得た。上記の顔料スラリに、顔料１００部に対
して平均粒子径が０．１４μｍのスチレン−ブタジエン
共重合体ラテックス（商品名：Ｔ−２２６１Ｆ／ジェイ
エスアール社）１０部、酸化澱粉糊液（商品名：エース
Ａ／王子コーンスターチ社）２部、滑剤としてステアリ
ン酸カルシウム（商品名：ノプコートＣ−１０４ＨＳ／
サンノプコ社）を０．３部（いずれも固形分換算）およ
び消泡剤、染料などの助剤を添加して、最終的に固形分
濃度が６２％の塗被液を調製した。(Preparation of Coating Liquid for Outer Pigment Coating Layer) Light calcium carbonate having an average particle size of 0.27 μm (trade name: T
40 parts of P-221GS / Okutama Kogyo Co., Ltd., 40 parts of heavy calcium carbonate having an average particle diameter of 0.6 μm (trade name: Hydrocarb 90 / Bibihoku Kagaku Kogyo Co., Ltd.) and fine kaolin (trade name: Milagros / Engelhard Co., Ltd.) : US) 20
Were dispersed in water with a Coreless disperser to obtain a pigment slurry. To the above pigment slurry, 10 parts of a styrene-butadiene copolymer latex (trade name: T-2261F / JSR Corporation) having an average particle diameter of 0.14 μm with respect to 100 parts of the pigment, and an oxidized starch paste solution (trade name: Ace A / Oji Cornstarch 2 parts, calcium stearate as a lubricant (trade name: Nopcoat C-104HS /
(San Nopco Co., Ltd.) (0.3% in terms of solid content) and auxiliaries such as an antifoaming agent and a dye were added to finally prepare a coating solution having a solid content of 62%.

【００４８】（外側顔料塗被層に隣接する内側顔料塗被
層用塗被液の調製）顔料として平均粒子径が０．６μｍ
の重質炭酸カルシウム（商品名：ハイドロカーブ９０／
前出）１００部からなる顔料スラリに、顔料１００部に
対して平均粒子径が０．１０μｍのスチレン−ブタジエ
ン共重合体ラテックス（商品名：Ｔ−２５６１Ｂ／ジェ
イエスアール社）を８部、酸化澱粉糊液（商品名：エー
スＡ／前出）を１部、滑剤としてステアリン酸カルシウ
ム（商品名：ノプコートＣ−１０４ＨＳ／前出）を０．
３部（いずれも固形分換算）および消泡剤、染料などの
助剤を添加し、最終的に固形分濃度が６４％の塗被液を
調製した。(Preparation of Coating Liquid for Inner Pigment Coating Layer Adjacent to Outer Pigment Coating Layer) The average particle diameter of the pigment is 0.6 μm.
Heavy calcium carbonate (Product name: Hydrocurve 90 /
As described above, a pigment slurry composed of 100 parts, 8 parts of a styrene-butadiene copolymer latex (trade name: T-2561B / JR) having an average particle diameter of 0.10 μm with respect to 100 parts of the pigment, and oxidized starch One part of the size liquid (trade name: Ace A / supra) and 0.1 part of calcium stearate (trade name: Nopcoat C-104HS / supra) as a lubricant.
Three parts (all in terms of solid content) and auxiliaries such as an antifoaming agent and a dye were added to finally prepare a coating solution having a solid content concentration of 64%.

【００４９】（塗被紙の製造）前記の原紙の両面に、上
記内側顔料塗被層用塗被液を、片面当りの乾燥重量が１
１ｇ／ｍ2となるようにブレードコーターを使用して片
面ずつの塗工、乾燥を行って下塗り塗被層（内側顔料塗
被層）を設けた。次いで、上記外側顔料塗被層用塗被液
を片面当りの乾燥重量が８ｇ／ｍ2となるようにブレー
ドコータで片面ずつの塗工、乾燥を行って水分が５．０
％の片面２度塗りの両面塗被紙を得た。このようにして
得られた塗被紙をスーパーカレンダに通紙して印刷用塗
被紙を得た。(Production of Coated Paper) The coating liquid for the inner pigment coating layer was coated on both sides of the base paper with a dry weight of 1 per side.
Using a blade coater, each side was coated and dried at 1 g / m 2 to provide an undercoat coating layer (inner pigment coating layer). Next, the coating liquid for the outer pigment coating layer was coated and dried on one side by a blade coater so that the dry weight per side was 8 g / m 2, and the water content was 5.0.
% Of a double-sided coated paper coated twice on one side. The coated paper thus obtained was passed through a super calendar to obtain a coated paper for printing.

【００５０】実施例２ 実施例１の外側顔料塗被層用塗被液の調製において、平
均粒子径０．２７μｍの軽質炭酸カルシウムに代えて、
平均粒子径が０．６４μｍの軽質炭酸カルシウム（商品
名：ＴＰ−１２１−７ｃ／奥多摩工業社）を使用したこ
と以外は、実施例１と同様にして印刷用塗被紙を得た。Example 2 In the preparation of the coating liquid for the outer pigment coating layer of Example 1, instead of light calcium carbonate having an average particle diameter of 0.27 μm,
A coated paper for printing was obtained in the same manner as in Example 1, except that light calcium carbonate having an average particle diameter of 0.64 μm (trade name: TP-121-7c / Okutama Industry Co., Ltd.) was used.

【００５１】実施例３ 実施例１の外側顔料塗被層用塗被液の調製において、平
均粒子径０．１４μｍのスチレン−ブタジエン共重合体
ラテックスに代えて、平均粒子径が０．１９μｍのスチ
レン−ブタジエン共重合体ラテックス（商品名：Ｔ−２
６４２Ｆ／ジェイエスアール社）を使用したこと以外
は、実施例１と同様にして印刷用塗被紙を得た。Example 3 In the preparation of the coating liquid for the outer pigment coating layer in Example 1, styrene having an average particle diameter of 0.19 μm was replaced with styrene-butadiene copolymer latex having an average particle diameter of 0.14 μm. -Butadiene copolymer latex (trade name: T-2)
Coated paper for printing was obtained in the same manner as in Example 1 except that No. 642F / JSR Co., Ltd. was used.

【００５２】実施例４ 実施例１の外側顔料塗被層用塗被液の調製において、平
均粒子径０．１４μｍのスチレン−ブタジエン共重合体
ラテックスに代えて、平均粒子径が０．１０μｍのスチ
レン−ブタジエン共重合体ラテックス（商品名：Ｔ−２
５６１Ｂ／前出）を使用したこと以外は、実施例１と同
様にして印刷用塗被紙を得た。Example 4 In the preparation of the coating liquid for the outer pigment coating layer of Example 1, styrene having an average particle diameter of 0.10 μm was used instead of the styrene-butadiene copolymer latex having an average particle diameter of 0.14 μm. -Butadiene copolymer latex (trade name: T-2)
Except that 561B / supra) was used, a coated paper for printing was obtained in the same manner as in Example 1.

【００５３】実施例５ 実施例１の外側顔料塗被層用塗被液の調製において、顔
料として、平均粒子径０．２７μｍの軽質炭酸カルシウ
ム４０部と平均粒子径０．６μｍの重質炭酸カルシウム
４０部の代りに、平均粒子径０．６４μｍの軽質炭酸カ
ルシウム（商品名：ＴＰ−１２１−７ｃ／前出）８０部
を使用し、さらに、接着剤としての酸化澱粉を使用せず
に、顔料１００部に対して、合成保水剤（アルコガムＬ
−２９Ｋ／日本ＮＳＣ社）を０．２部、平均粒子径が
０．１４μｍのスチレン−ブタジエン共重合体ラテック
ス（商品名：Ｔ−２２６１Ｆ／前出）１１部（いずれも
固形分換算）を使用した以外は同様にして、外側顔料塗
被層用塗被液を調製した。次いで、実施例１の塗被紙の
製造において、上記で得た外側顔料塗被層用塗被液を使
用したことと、スーパーカレンダーの条件を強くした以
外は、実施例１と同様にして印刷用塗被紙を得た。Example 5 In the preparation of the coating liquid for the outer pigment coating layer in Example 1, 40 parts of light calcium carbonate having an average particle diameter of 0.27 μm and heavy calcium carbonate having an average particle diameter of 0.6 μm were used as pigments. Instead of 40 parts, 80 parts of light calcium carbonate having an average particle diameter of 0.64 μm (trade name: TP-121-7c / supra) was used, and the pigment was used without using oxidized starch as an adhesive. Synthetic water retention agent (Alcogum L
(-29K / NSC Japan) 0.2 parts, 11 parts of styrene-butadiene copolymer latex (trade name: T-2261F / mentioned above) having an average particle diameter of 0.14 μm (all in terms of solid content) are used. A coating liquid for an outer pigment coating layer was prepared in the same manner except that the coating was performed. Next, in the manufacture of the coated paper of Example 1, printing was performed in the same manner as in Example 1 except that the coating liquid for the outer pigment coating layer obtained above was used and the conditions of the super calender were strengthened. Coated paper was obtained.

【００５４】実施例６ 実施例１の外側顔料塗被層用塗被液の調製において、平
均粒子径０．２７μｍの軽質炭酸カルシウムに代えて、
平均粒子径が０．６４μｍの軽質炭酸カルシウム（商品
名：ＴＰ−１２１−７ｃ／前出）を使用したこと、さら
に、内側顔料塗被層用塗被液の調製において、顔料とし
て、平均粒子径０．６μｍの重質炭酸カルシウム１００
部の代りに、０．６μｍの重質炭酸カルシウム(商品
名：ハイドロカーブ９０／前出)８５部と微粒カオリン
(商品名：ミラグロス／前出)１５部からなる顔料を使用
したこと以外は、実施例１と同様にして印刷用塗被紙を
得た。Example 6 In the preparation of the coating liquid for the outer pigment coating layer of Example 1, instead of light calcium carbonate having an average particle diameter of 0.27 μm,
Light calcium carbonate having an average particle diameter of 0.64 μm (trade name: TP-121-7c / supra) was used. Further, in the preparation of the coating liquid for the inner pigment coating layer, the average particle diameter was used as a pigment. 0.6 μm heavy calcium carbonate 100
85 parts of 0.6 μm heavy calcium carbonate (trade name: Hydrocurve 90 / supra) and fine kaolin
(Product name: Milagros / supra) A coated paper for printing was obtained in the same manner as in Example 1 except that a pigment consisting of 15 parts was used.

【００５５】比較例１ 実施例１の内側顔料塗被層用塗被液の調製において、平
均粒子径０．６μｍの重質炭酸カルシウムに代えて、平
均粒子径が１．２μｍの重質炭酸カルシウム（商品名：
ハイドロカーブ６０／備北粉化工業社）を使用したこ
と、および接着剤として、顔料１００部に対して平均粒
子径０．１０μｍのスチレン−ブタジエン系共重合体ラ
テックス（商品名：Ｔ−２５６１Ｂ／前出）を５部、酸
化澱粉糊液（商品名：エースＡ／前出）を７部（固形
分）に変更した以外は、実施例１と同様にして印刷用塗
被紙を得た。Comparative Example 1 In the preparation of the coating liquid for the inner pigment coating layer in Example 1, heavy calcium carbonate having an average particle diameter of 1.2 μm was used instead of heavy calcium carbonate having an average particle diameter of 0.6 μm. (Product name:
Hydro Curve 60 / Bihoku Funka Kogyo Co., Ltd.) that was used, and as an adhesive, a styrene having an average particle size of 0.10μm on 100 parts of the pigment - butadiene copolymer latex (trade name: T-25 6 1B Coated paper for printing was obtained in the same manner as in Example 1, except that 5 parts / (the above) was changed to 7 parts (solid content) of the oxidized starch paste solution (trade name: Ace A / the above). .

【００５６】比較例２ 実施例１の外側顔料塗被層用塗被液の調製において、軽
質炭酸カルシウムの代わりに、微粒カオリン（総計６０
部）を使用したこと以外は、実施例１と同様にして印刷
用塗被紙を得た。Comparative Example 2 In the preparation of the coating liquid for the outer pigment coating layer of Example 1, fine kaolin (60 in total) was used instead of light calcium carbonate.
Coating paper for printing was obtained in the same manner as in Example 1 except that the above-mentioned Example 1 was used.

【００５７】かくして得られた実施例１〜６および比較
例１および２の印刷用塗被紙について、下記のごとき評
価を行い、得られた結果を表１にまとめて示した。The printing coated papers of Examples 1 to 6 and Comparative Examples 1 and 2 thus obtained were evaluated as follows, and the obtained results are shown in Table 1.

【００５８】● 塗被紙の光沢 ＪＩＳ−Ｐ８１４２に準じて両面を測定し、その平均を
求めた。● Gloss of coated paper Both surfaces were measured according to JIS-P8142, and the average was determined.

【００５９】● 塗被紙の王研式平滑度 Ｊ．ＴＡＰＰＩ紙パルプ試験方法Ｎｏ５Ｂに準じて王研
式平滑度計で両面を測定し、その平均を求めた。● Oken-type smoothness of coated paper According to TAPPI paper pulp test method No. 5B, both surfaces were measured with an Oken type smoothness meter, and the average was determined.

【００６０】● 水銀圧入法による塗被紙の空隙構造測
定 ＰＭＩ社製のポロシメータを用い、２０℃、６５ＲＨ％
で調湿した塗被紙約２ｇを精秤し、水銀の表面張力を
０．４８０（Ｎ／ｍ）、塗被紙との接触角を１４０°と
して求めた。顔料塗被層由来とみなして求める空隙径
０．０３〜０．４μｍの範囲の空隙における累積空隙容
積は、測定しようとする塗被紙を２０℃、６５ＲＨ％で
調湿してその米坪と測定に供する試料の重量を測定し、
水銀圧入法で得られた累積空隙容積を測定に供した試料
重量で除して塗被紙の単位重量当りの累積容積とし、さ
らに、これに塗被紙の米坪と１／２を乗じて塗被紙の片
面当たりの顔料塗被層に相当する単位面積当りの累積容
積（単位：ｍｌ／ｍ2 ）とした。また、平均空隙径は、
対象空隙径範囲０．０３〜０．４μｍの累積容積を１０
０％として、空隙径の大きいから累積してその上記空隙
径範囲の累積容積が５０％となるときに対応する空隙径
をもって示した。● Measurement of void structure of coated paper by mercury intrusion method Using a porosimeter manufactured by PMI, 20 ° C., 65 RH%
Approximately 2 g of the coated paper conditioned by the above was precisely weighed, and the surface tension of mercury was determined to be 0.480 (N / m), and the contact angle with the coated paper was determined to be 140 °. The cumulative void volume in the voids having a void diameter in the range of 0.03 to 0.4 μm, which is determined as being derived from the pigment coating layer, is determined by controlling the humidity of the coated paper to be measured at 20 ° C. and 65 RH%. Measure the weight of the sample to be measured,
The cumulative void volume obtained by the mercury intrusion method was divided by the weight of the sample subjected to the measurement to obtain the cumulative volume per unit weight of the coated paper, which was further multiplied by 1/2 of the rice tsubo of the coated paper. The cumulative volume per unit area (unit: ml / m 2) corresponding to the pigment coated layer per one side of the coated paper. The average pore diameter is
The cumulative volume of the target pore diameter range of 0.03 to 0.4 μm is set to 10
When the cumulative volume of the above-mentioned void diameter range becomes 50% when the cumulative volume is 50%, the void diameter is shown as a void diameter corresponding to 0%.

【００６１】● ブリストー試験法による塗被紙の吸収
係数Ｋａ ブリストー試験機（ブリストー式液体動的吸収性試験機
／熊谷理機製）を使用して、Ｊ．ＴＡＰＰＩ 紙パルプ
試験方法Ｎｏ５１に準拠して測定した。ただし、ここで
は、インキ中の溶剤を代用するために、ＪＩＳ Ｚ−８
８０９に規定される標準粘度オイル（ＪＳ２．５）を評
価液として使用した。接触時間１９８〜１９９８ミリ秒
の間で得られた評価液の転移量Ｖ（ｍｌ／ｍ2 ）と接触
時間（ミリ秒）の平方根の関係図を描き、得られる直線
の傾きから吸収係数Ｋａを求めた。なお、測定は２０
℃、６５ＲＨ％の環境下で行った。The absorption coefficient Ka of the coated paper according to the Bristow test method was measured using a Bristow tester (Bristow-type liquid dynamic absorption tester / manufactured by Kumagaya Riki). TAPPI Measured according to paper pulp test method No. 51. However, here, JIS Z-8 is used in order to substitute the solvent in the ink.
Standard viscosity oil (JS2.5) specified in 809 was used as an evaluation liquid. A drawing is made of the relationship between the transfer amount V (ml / m2) of the evaluation solution obtained during the contact time of 198 to 1998 milliseconds and the square root of the contact time (millisecond), and the absorption coefficient Ka is determined from the slope of the obtained straight line. Was. The measurement was performed for 20
The test was performed in an environment of 65 ° C. and 65% RH.

【００６２】 ● オフセット枚葉片面印刷機による反転印刷可能時間 三菱ダイヤ４Ｅ−４印刷機により、プロセスインキで８
０００枚／時間の速度で片面４色印刷し、印刷後３０
分、１時間、１．５時間、２時間および３時間と反対面
の印刷に取りかかるまでの放置時間を変化させて反対面
を印刷した際の、先印刷面に傷がつかずに反対面の印刷
ができるまでの放置時間を判断した。● Reversible printing time by offset sheet-fed single-sided printing machine 8 times with process ink by Mitsubishi Diamond 4E-4 printing machine
Print four colors on one side at a speed of 000 sheets / hour, and after printing 30
Minutes, 1 hour, 1.5 hours, 2 hours, and 3 hours. Judgment was made on the standing time until printing was possible.

【００６３】● 印刷光沢発現性 オフセット枚葉印刷機による反転印刷可能時間測定用に
印刷した先印刷面の４色ベタ図柄部の６０°光沢をＪＩ
Ｓ Ｚ８７４１に準拠して測定し、４色ベタ図柄部の６
０°光沢から白紙部の７５°光沢（ＪＩＳ Ｐ８１４
２）の差を求めた。この差が大きいほど印刷光沢発現性
が高いことを示す。● Print Gloss Development The 60 ° gloss of the four-color solid design portion of the preprinted surface printed for measuring the reversible printable time by the offset sheet-fed printing machine was determined by JI.
S Measured in accordance with Z8741.
From 0 ° gloss to 75 ° gloss of blank paper (JIS P814
The difference in 2) was obtained. The greater the difference, the higher the print gloss development.

【００６４】また、実施例１〜６および比較例１、２で
得られた印刷用塗被紙について、下記方法でオフセット
両面枚葉印刷機での印刷適性を評価した。評価結果を表
２に示す。The printability of the coated printing papers obtained in Examples 1 to 6 and Comparative Examples 1 and 2 was evaluated by the following method using an offset double-sided sheet-fed printing press. Table 2 shows the evaluation results.

【００６５】 ● オフセット両面枚葉印刷機での印刷適性評価 ハイデル社８色両面枚葉印刷機で、ノンスキンタイプイ
ンキ（Ｔ＆Ｋ ＴＯＫＡ社）を使用して、１００００枚
／時間の速度で５０００枚を印刷した後の最終８色目の
圧胴へのインキの堆積程度と図柄の欠点程度を、以下の
基準で評価した。 ○ ： 圧胴にわずかなインキの堆積があるが、印刷物
に欠点はない △ ： 圧胴にかなりのインキの堆積があるが、印刷物
に欠点はない × ： 圧胴にかなりのインキの堆積があり、印刷物に
網点の抜けが認められる● Evaluation of print suitability with offset double-sided sheet-fed printing press Using a non-skin type ink (T & K TOKA) with Heidel 8-color double-sided sheet-fed printing press, 5000 sheets were printed at a speed of 10,000 sheets / hour. The degree of ink deposition on the impression cylinder of the final eighth color after printing and the degree of defects in the design were evaluated based on the following criteria. : Slight ink accumulation on the impression cylinder, but no defect in the printed matter △: Significant ink accumulation on the impression cylinder, but no defect in the printed matter ×: Considerable ink accumulation on the impression cylinder , Missing dots in printed matter

【００６６】さらに、実施例１〜６と比較例1〜２で得
た印刷用塗被紙について、下記の方法により塗工紙断面
から外側塗被層と内側塗被層の平均空隙径を測定した。
得られた結果を表２に示す。 ● 断面写真観察による外側および内側顔料塗被層の平
均空隙径測定 断面調製 塗被紙サンプルを、ダイヤモンドナイフを用いたウルト
ラミクロトーム（ＬＫＢ社製，ＳＹＳＴＥＭ２１２８）
で切り出して断面切片を作成し、得られた切片の観察し
たい面に白金を10ｎｍ蒸着する。蒸着した切片を、ＦＩ
Ｂ（Focused Ion Beam／日立製作所製，ＦＢ２０００
Ａ型）でガリウムイオン源を用いて加速電圧３０ｋｖ
で、先ず粗加工（電流９ｎＡ、ビーム径３００ｎｍ）
し、さらに仕上げ加工（電流０．３ｎＡ、ビーム径３０
ｎｍ）処理して、ミクロトーム切り出しによるダーメー
ジ部分を除去した断面サンプルを得た。なお、ＦＩＢ処
理面積は、幅５００μｍ×高さ（紙の厚さ方向）１００
μｍ×深さ１０μｍである。 ＦＥ−ＳＥＭ観察 上記方法で得た塗被紙の切片（断面）サンプルのＦＩＢ
処理面について、ＦＥ−ＳＥＭ（電界放射型走査電子顕
微鏡／日立製作所製，Ｓ−８００型）を使用して、加速
電圧５ｋｖで倍率１万倍の二次電子画像の写真を、場所
を変えて３枚撮影した。なお、外側顔料塗被層と内側顔
料塗被層を明確にするため、同時に反射電子画像も確認
した。 画像処理および平均空隙径の算出 上記１万倍の塗被紙断面写真それぞれを、イメージスキ
ャナーを使用して解像度４００ｄｐｉでパーソナルコン
ピュータに画像データとして取り込んだ。なお、取り込
み面積は、外側塗被層、内側塗被層をそれぞれ幅１００
μｍで、高さ（紙の厚み方向）は、外側塗被層、内側塗
被層の厚みに応じて適宜調整した。次いで、取り込んだ
画像データを、画像処理・解析システム（王子計測機器
社製，ドットアナライザーＤＡ−５０００型）を使用し
て自動２値化処理し、細孔面積から得られる円相当の細
孔径（細孔面積と同面積を有する円の直径）を算出し
た。なお、平均空隙径は、得られた空隙径範囲において
累積容積が５０％となるときに対応する空隙径をもって
示し、それぞれの写真から得られる平均空隙を平均し
た。Further, with respect to the coated printing papers obtained in Examples 1 to 6 and Comparative Examples 1 and 2, the average pore diameter of the outer coating layer and the inner coating layer was measured from the cross section of the coated paper by the following method. did.
Table 2 shows the obtained results. ● Measurement of average void diameter of outer and inner pigment coating layers by cross-sectional photograph observation Preparation of cross-section The coated paper sample was ultramicrotome using diamond knife (SYSTEM2128, manufactured by LKB).
Then, a section is prepared by cutting out, and platinum is deposited to a thickness of 10 nm on the surface of the obtained section to be observed. The deposited sections are then removed by FI
B (Focused Ion Beam / FB2000 manufactured by Hitachi, Ltd.)
A type) using a gallium ion source and accelerating voltage 30 kv
First, rough processing (current 9 nA, beam diameter 300 nm)
And finish processing (current 0.3 nA, beam diameter 30)
nm) to obtain a cross-sectional sample from which the dermajee portion was removed by cutting out the microtome. Note that the FIB processing area is 100 μm in width × 100 in height (in the thickness direction of paper).
μm × 10 μm depth. FE-SEM observation FIB of section (cross-section) sample of coated paper obtained by the above method
Using a FE-SEM (field emission scanning electron microscope / S-800, manufactured by Hitachi, Ltd.) for the treated surface, a photograph of a secondary electron image of 10,000 times magnification at an accelerating voltage of 5 kv was relocated. Three pictures were taken. In order to clarify the outer pigment coating layer and the inner pigment coating layer, a backscattered electron image was also confirmed at the same time. Image Processing and Calculation of Average Void Diameter Each of the above 10,000-fold coated paper cross-sectional photographs was captured as image data in a personal computer at a resolution of 400 dpi using an image scanner. In addition, the take-in area is such that each of the outer coating layer and the inner coating layer has a width of 100 mm.
In μm, the height (in the thickness direction of the paper) was appropriately adjusted according to the thickness of the outer coating layer and the inner coating layer. Next, the captured image data is automatically binarized using an image processing / analysis system (manufactured by Oji Scientific Instruments, Dot Analyzer DA-5000), and a pore diameter equivalent to a circle obtained from a pore area ( The diameter of a circle having the same area as the pore area) was calculated. In addition, the average void diameter is indicated by the corresponding void diameter when the cumulative volume becomes 50% in the obtained void diameter range, and the average void obtained from each photograph is averaged.

【００６７】[0067]

【表１】 [Table 1]

【００６８】[0068]

【表２】 [Table 2]

【００６９】[0069]

【発明の効果】表１および２より明らかなように、本発
明に係る印刷用塗被紙はオフセット枚葉印刷機の片面機
および両面機で使用した場合に、高い印刷光沢発現性や
両面機での良好な印刷適性を示した。さらに、片面機で
の短時間反転印刷が可能となって印刷作業における高い
生産性を示した。As is clear from Tables 1 and 2, the coated paper for printing according to the present invention has high print glossiness and double-sided printing when used in a single-sided and a double-sided offset sheet-fed printing press. Showed good printability. Furthermore, short-time reversal printing on a single-sided machine was made possible, and high productivity in printing work was shown.

───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4L055 AG11 AG12 AH02 AH37 AJ04 BE09 EA10 EA12 EA16 EA18 FA15 GA19  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L055 AG11 AG12 AH02 AH37 AJ04 BE09 EA10 EA12 EA16 EA18 FA15 GA19

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】原紙の少なくとも片面に顔料と接着剤を主
成分とする顔料塗被層を１層以上有する印刷用塗被紙に
おいて、水銀圧入法によって測定した空隙径０．０３〜
０．４μｍの範囲の空隙における累積空隙容積と平均空
隙径が各々４．０〜１０ｍｌ／ｍ2と０．０４〜０．２
μｍの範囲にあり、さらに該塗被紙のブリストー試験機
を使用してＪＩＳ Ｚ８８０９−１９９２に規定される
標準粘度オイル（ＪＳ２．５）を評価液に用いて測定し
た吸収係数Ｋａが０．３５〜１．５ｍｌ／（ｍ2・ｍｓ
1/2）であることを特徴とする印刷用塗被紙。1. A printing paper having at least one pigment coating layer containing a pigment and an adhesive as a main component on at least one surface of a base paper, having a pore size of from 0.03 to 0.03 as measured by a mercury intrusion method.
Cumulative void volume and average void diameter in voids in the range of 0.4 μm are 4.0 to 10 ml / m 2 and 0.04 to 0.2, respectively.
μm, and the absorption coefficient Ka of the coated paper measured using a standard viscosity oil (JS2.5) specified in JIS Z 8809-1992 using a Bristow tester as an evaluation solution was 0.35. ~ 1.5 ml / (m 2 · ms
1/2 ) a coated paper for printing, characterized in that: 【請求項２】顔料塗被層を原紙の両面に有し、かつ該顔
料塗被層面のＪ．ＴＡＰＰＩ紙パルプ試験方法Ｎｏ．５
Ｂに準拠して測定した平滑度が３００秒以上である請求
項１記載の印刷用塗被紙。2. A base paper having pigment coating layers on both sides thereof, TAPPI paper pulp test method No. 5
The coated paper for printing according to claim 1, wherein the smoothness measured according to B is 300 seconds or more. 【請求項３】顔料塗被層が、外側顔料塗被層とそれに隣
接する原紙面に近い内側顔料塗被層の少なくとも2層か
らなり、該外側顔料塗被層が、顔料として炭酸カルシウ
ムを全顔料の７０〜１００重量％、かつ接着剤を全顔料
に対して１０〜２０重量％含有し、さらに該内側顔料塗
被層が、顔料として平均粒子径０．１〜１．０μｍの炭
酸カルシウムを全顔料の８０〜１００重量％、かつ接着
剤を全顔料に対して１０重量％以下となるように含有せ
しめた請求項１または２に記載の印刷用塗被紙。3. The pigment coating layer comprises an outer pigment coating layer and at least two adjacent inner pigment coating layers close to the base paper surface, wherein the outer pigment coating layer contains calcium carbonate as a pigment. 70 to 100% by weight of the pigment and 10 to 20% by weight of the adhesive with respect to the total pigment, and the inner pigment coating layer contains calcium carbonate having an average particle diameter of 0.1 to 1.0 μm as a pigment. 3. The coated paper for printing according to claim 1, wherein 80 to 100% by weight of all pigments and 10% by weight or less of the adhesive with respect to all pigments are contained. 【請求項４】外側顔料塗被層中の炭酸カルシウムの３０
〜１００重量％が、平均粒子径０．３〜１．５μｍの軽
質炭酸カルシウムである請求項３に記載の印刷用塗被
紙。4. The method according to claim 1, wherein calcium carbonate in the outer pigment coating layer is 30%.
The coated paper for printing according to claim 3, wherein -100% by weight is light calcium carbonate having an average particle diameter of 0.3 to 1.5 µm. 【請求項５】原紙の少なくとも片面に顔料と接着剤を主
成分とする顔料塗被層を有する印刷用塗被紙において、
該顔料塗被層が、外側顔料塗被層とそれに隣接する原紙
面に近い内側顔料塗被層の少なくとも2層からなり、該
塗被紙の断面観察により求めた該外側顔料塗被層の平均
空隙径ＲO（μｍ）と該内側顔料塗被層の平均空隙径ＲI
（μｍ）の関係が、０．１ＲO≦ＲI≦０．９５ＲOであ
ることを特徴とする印刷用塗被紙。5. A printing coated paper having a pigment coated layer containing a pigment and an adhesive as main components on at least one side of a base paper,
The pigment coated layer is composed of at least two layers of an outer pigment coated layer and an inner pigment coated layer adjacent to the base paper surface adjacent thereto, and the average of the outer pigment coated layer determined by observing a cross section of the coated paper. The void diameter R O (μm) and the average void diameter R I of the inner pigment coating layer
Relationship ([mu] m) is coated paper for printing, which is a 0.1R O ≦ R I ≦ 0.95R O .
JP2000173608A 2000-01-04 2000-06-09 Coated paper for printing Expired - Fee Related JP3736609B2 (en)

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JP2000000071 2000-01-04
JP2000173608A JP3736609B2 (en) 2000-01-04 2000-06-09 Coated paper for printing

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006501382A (en) * 2002-10-01 2006-01-12 エスエーピーピーアイ ネザーランズ サーヴィシーズ ビー．ヴイ Coated printing sheet and method for producing the same
JP2007046189A (en) * 2005-08-10 2007-02-22 Nippon Paper Industries Co Ltd Coated paper for printing
WO2007129654A1 (en) * 2006-05-02 2007-11-15 Daio Paper Corporation Production method of enamel paper
US7407700B2 (en) 2003-04-24 2008-08-05 Oji Paper Co., Ltd. Coated paper for printing
JP2009501283A (en) * 2005-07-13 2009-01-15 エスエーピーピーアイ ネザーランズ サーヴィシーズ ビー．ヴイ Coated paper for offset printing
WO2014051052A1 (en) * 2012-09-28 2014-04-03 株式会社ユポ・コーポレーション Stretched resin film, method for producing same, and laminate using stretched resin film

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006501382A (en) * 2002-10-01 2006-01-12 エスエーピーピーアイ ネザーランズ サーヴィシーズ ビー．ヴイ Coated printing sheet and method for producing the same
US7407700B2 (en) 2003-04-24 2008-08-05 Oji Paper Co., Ltd. Coated paper for printing
JP2009501283A (en) * 2005-07-13 2009-01-15 エスエーピーピーアイ ネザーランズ サーヴィシーズ ビー．ヴイ Coated paper for offset printing
JP2007046189A (en) * 2005-08-10 2007-02-22 Nippon Paper Industries Co Ltd Coated paper for printing
WO2007129654A1 (en) * 2006-05-02 2007-11-15 Daio Paper Corporation Production method of enamel paper
JP2007297750A (en) * 2006-05-02 2007-11-15 Daio Paper Corp Method for producing coated paper
US8603298B2 (en) 2006-05-02 2013-12-10 Daio Paper Corporation Method of manufacturing coated paper
WO2014051052A1 (en) * 2012-09-28 2014-04-03 株式会社ユポ・コーポレーション Stretched resin film, method for producing same, and laminate using stretched resin film

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