JP2001262494A - Method for producing coated paper for printing - Google Patents
Method for producing coated paper for printingInfo
- Publication number
- JP2001262494A JP2001262494A JP2000071378A JP2000071378A JP2001262494A JP 2001262494 A JP2001262494 A JP 2001262494A JP 2000071378 A JP2000071378 A JP 2000071378A JP 2000071378 A JP2000071378 A JP 2000071378A JP 2001262494 A JP2001262494 A JP 2001262494A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- printing
- coated paper
- coating liquid
- paper
- 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.)
- Pending
Links
Landscapes
- Paper (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、印刷用塗工紙、及
びその製造方法に関するものであり、更に詳しくは塗工
ムラの発生しない印刷用塗工紙およびその製造方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated paper for printing and a method for producing the same, and more particularly, to a coated paper for printing free from uneven coating and a method for producing the same.
【0002】[0002]
【従来の技術】従来より、顔料塗工紙は、未塗工の上質
紙と比較して平滑性、光沢が高く、インキの吸収性が均
一であるため、印刷用塗工紙として用いられている。特
に近年、印刷物の視覚化が進み、印刷用塗工紙に対する
要求も多様化しており、さらに、印刷方式もグラビア、
輪転オフセット、枚用オフセットなど多種にわたり、そ
れぞれの印刷様式に適合した特性を持つ印刷用塗工紙の
開発が進んでいる。このような状況の中で、顔料塗工を
行う印刷用塗工紙の塗工技術に対する要求は、表面の平
滑性が高く、塗工欠点のない製品を高い生産性下で得る
ことである。2. Description of the Related Art Conventionally, pigment coated paper has been used as a coated paper for printing because of its high smoothness and gloss and uniform ink absorption as compared with uncoated fine paper. I have. In particular, in recent years, visualization of printed matter has been advanced, requirements for coated paper for printing have been diversified, and the printing method has also been gravure,
There is a wide variety of web offsets and sheet offsets, and the development of coated printing papers having characteristics suitable for each printing style is in progress. In such a situation, a demand for a coating technique of a printing coated paper for performing a pigment coating is to obtain a product having high surface smoothness and having no coating defects under high productivity.
【0003】顔料塗工を行う印刷用塗工紙の塗工方法も
多岐にわたるが、具体的には、ブレード塗工法、エアナ
イフ塗工法、ロール塗工法を挙げることが出来る。しか
しながら、これらの塗工方式では、塗工液に含まれる顔
料の種類や形状を、塗工製品の品質や工程の安定性を考
慮すると、制約せざるを得ず、品質の向上に多大な効果
を有する顔料の添加を断念することを余儀なくされ、高
品質な印刷用塗工紙を得ることが望めない状況にある。[0003] There are a wide variety of coating methods for printing coated paper for performing pigment coating, and specific examples thereof include a blade coating method, an air knife coating method, and a roll coating method. However, in these coating methods, the type and shape of the pigment contained in the coating liquid must be restricted in consideration of the quality of the coated product and the stability of the process, and there is a great effect on improving the quality. Therefore, it is inevitable to give up the addition of a pigment having a high-quality printing coated paper.
【0004】すなわち、ブレード塗工法では、塗工操作
において、ストリークやスクラッチなどの塗工欠陥が生
じ易い。ストリークやスクラッチが発生すると、発生部
分は全て損紙となるため、生産の効率化やコストの面で
大きな損失となる。また、これらの欠陥の発生は、塗工
速度が高速化されるほど、また、塗工濃度が高くなるほ
ど一層顕著なものとなり、生産の効率化と品質の向上が
両立しない。[0004] That is, in the blade coating method, coating defects such as streaks and scratches tend to occur in the coating operation. If streaks or scratches occur, all of the occurrences will be wasted, resulting in large losses in terms of production efficiency and cost. In addition, the occurrence of these defects becomes more remarkable as the coating speed is increased and the coating concentration is increased, so that the efficiency of production and the improvement of quality are not compatible.
【0005】また、かかる塗工法は、余剰な液の供給か
ら計量までの間に、ウェブに塗工液中の水あるいはバイ
ンダー成分が必要以上に進入するため、余剰分として掻
き落とされた液は、供給前の液の組成と異なる。従っ
て、時間の経過と共に塗工液の組成が変化し、安定した
品質の製品を得ることが出来ない。[0005] Further, in such a coating method, since the water or the binder component in the coating liquid enters the web more than necessary between the supply of the excess liquid and the measurement, the liquid scraped off as excess is , Different from the composition of the liquid before supply. Therefore, the composition of the coating liquid changes over time, and a product of stable quality cannot be obtained.
【0006】エアナイフ塗工法は、エアナイフ特有のパ
ターンを塗工層に発生し易い。このことにより、塗工層
の表面の光沢、平滑度は著しく低下し、単に品質が低下
するだけでなく、印刷時にも重大な傷害となる。この傾
向は、塗工速度を高くした場合や液を高濃度化した場合
に顕著なものとなり、生産の効率化と品質の向上が両立
しない。In the air knife coating method, a pattern peculiar to the air knife is easily generated in a coating layer. As a result, the gloss and smoothness of the surface of the coating layer are remarkably reduced, and not only the quality is reduced, but also a serious damage occurs during printing. This tendency becomes remarkable when the coating speed is increased or when the concentration of the liquid is increased, and it is not possible to achieve both efficiency of production and improvement of quality.
【0007】ロール塗工法は、ロールの組み合わせなど
により様々な形式のものが存在するが、基本的には、複
数ロールを組み合わせてロール間での塗工液の転写によ
り液を計量しウェブに転写する塗工方法である。かかる
塗工方法は、ロール特有のパターンを発生しやすく、ま
た、塗工ロール面とウェブの転写後の剥離の際に塗工面
の光沢、平滑性が低下し、品質が低下するだけでなく、
印刷時にも重大な傷害となる。この傾向は、液濃度、あ
るいは、塗工速度を高くすると顕著になる。[0007] There are various types of roll coating methods depending on the combination of rolls and the like. Basically, a plurality of rolls are combined and the liquid is measured by transferring the coating liquid between the rolls and transferred to the web. It is a coating method. Such a coating method is likely to generate a roll-specific pattern, and also, when peeling after transfer of the coating roll surface and the web, the gloss of the coated surface, the smoothness is reduced, and the quality is reduced,
It is also a serious injury when printing. This tendency becomes remarkable when the liquid concentration or the coating speed is increased.
【0008】これらに対し、カーテン塗工法は、塗工液
が流路を規制されて流れる場が、コーターヘッドの内部
のスリットの部分だけであり、このスリット幅の選択範
囲は広いが、通常は、0.2mm〜1.0mmの間であ
る。カーテン塗工法では、リップから流出した液は、ウ
ェブに接触するまで自由表面を形成するため、流路を規
制されない。これに対して、ロッドやブレード塗工方式
では、塗工液の計量が行われるブレードとウェブの最小
の間隙は、通常は、0.05mm以下である。従って、
凝集物や異物などが塗工液中に存在する場合に、ストリ
ークとして現れる確率は、ブレード塗工方式より、カー
テン塗工方式の方が極めて低い。On the other hand, in the curtain coating method, the coating liquid flows in a restricted flow path only in the slit portion inside the coater head, and the slit width can be selected in a wide range. , 0.2 mm to 1.0 mm. In the curtain coating method, the liquid flowing out of the lip forms a free surface until it contacts the web, so that the flow path is not restricted. On the other hand, in the rod or blade coating method, the minimum gap between the blade and the web where the coating liquid is measured is usually 0.05 mm or less. Therefore,
When aggregates and foreign substances are present in the coating liquid, the probability of appearing as streaks is much lower in the curtain coating method than in the blade coating method.
【0009】また、カーテン塗工方式は、前計量型の塗
工方式であるため、ヘッドから流出した塗工液が回収さ
れて使用される量が少ない。一方、ブレード塗工方式
は、一旦、塗工液を過剰に供給した後に、掻き落として
計量を行う後計量型の塗工方式であるため、回収される
液量は、カーテン塗工方式と比較して多い。また、ブレ
ード塗工方式では、過剰な塗工液がウェブに供給された
ときに、塗液中の水あるいはバインダーがウェブに選択
的に吸収され、回収液が高濃度化して塗工液が高濃度化
したり、原紙表面に付着している異物が回収液に同伴し
てストリークの原因となる。従って、カーテン塗工方式
では、長時間の操業でも塗工液が濃度変化することな
く、安定した塗工が行える。更に、カーテン塗工方式
は、ブレード塗工方式のように原紙とメタリングブレー
ドが接触しているような接触式の塗工方法でないいため
に紙切れが非常に起こり難く、操業的にも安定している
という利点も有している。Further, since the curtain coating method is a pre-measurement type coating method, the amount of the coating liquid flowing out of the head is recovered and used less. On the other hand, the blade coating method is a metering type coating method in which an excess amount of the coating liquid is once supplied and then scraped off and weighed. Many Further, in the blade coating method, when an excessive coating liquid is supplied to the web, water or a binder in the coating liquid is selectively absorbed by the web, and the concentration of the recovered liquid becomes high, so that the coating liquid becomes high. Concentration or foreign matter adhering to the base paper surface accompanies the recovered liquid and causes a streak. Therefore, in the curtain coating method, stable coating can be performed without a change in the concentration of the coating liquid even during long-time operation. Furthermore, since the curtain coating method is not a contact-type coating method in which the base paper and the metering blade are in contact with each other as in the blade coating method, paper breakage is extremely unlikely to occur, and operation is stable. It also has the advantage of being
【0010】このように、カーテン塗工方式は、前計量
型の塗工装置であり、塗工時に塗工液の掻き落としがな
いため、紙切れなく、塗工液がウェブの表面形状に沿っ
た極めて均一な、いわゆる輪郭塗工層を形成する。これ
は、ウェブに多少の凸凹が存在しても、塗工層が均一で
あるため、塗工ムラの発生がなく、特に、平滑性に優れ
たウェブ上に塗工を行った場合には、塗布面の平滑性と
塗布量の均一性に優れた理想的な印刷用塗工紙を得るこ
とが出来る。As described above, the curtain coating method is a pre-measuring type coating apparatus, and since the coating liquid is not scraped off at the time of coating, the coating liquid does not break and the coating liquid follows the surface shape of the web. It forms a very uniform, so-called contour coating layer. This means that even if there are some irregularities in the web, the coating layer is uniform, so there is no occurrence of coating unevenness, especially when coating is performed on a web with excellent smoothness. An ideal coated paper for printing excellent in the smoothness of the coated surface and the uniformity of the coated amount can be obtained.
【0011】しかしながら、カーテン塗工方式にも問題
点は存在する。カーテン塗工方式は高速塗工適性に優れ
た塗工方式ではあるが、生産性の向上を目的として、更
なる塗工速度の増加を図った場合、ウェブと塗工液中に
空気が同伴される、いわゆる空気同伴という現象が現れ
てくる。即ち、走行するウェブによって運ばれる空気の
流れがカーテン膜、及びカーテン膜とウェブの接触線に
衝突して、カーテン膜と接触線を動揺せしめ、ウェブと
塗工液との間に空気を同伴せしめる現象であり、この空
気同伴現象が生じると、塗工された塗工表面には、ピン
ホール状の未塗工部分が現れ、このピンホール状の未塗
工部分は塗工ムラとなり、印刷後においても、印刷され
ることが無く、印刷ムラとなって残ってしまう。[0011] However, there are also problems with the curtain coating method. Although the curtain coating method is a coating method with excellent high-speed coating suitability, air is entrained in the web and the coating liquid when the coating speed is further increased to improve productivity. The phenomenon of so-called air entrainment appears. That is, the flow of air carried by the running web collides with the curtain film, and the contact line between the curtain film and the web, causing the curtain film and the contact line to move and entraining air between the web and the coating liquid. When this air entrainment phenomenon occurs, pinhole-shaped uncoated portions appear on the coated coating surface, and the pinhole-shaped uncoated portions become coating unevenness, and after printing, In this case, printing is not performed, and printing unevenness remains.
【0012】このような空気同伴現象は、例えば、塗工
速度が速ければ速いほど顕著になり、ウェブの平滑性が
低下するほど顕著な現象となって現れることが経験上知
られている。It is empirically known that such an air entrainment phenomenon becomes more conspicuous as the coating speed is higher, and becomes more pronounced as the smoothness of the web is reduced.
【0013】印刷用塗工紙においては、このような塗工
欠陥は致命的であるため、この空気同伴現象の発生を抑
制することは塗工の高速化を行う上で重要な課題となる
ことは明白である。In a coated paper for printing, since such coating defects are fatal, suppressing the occurrence of the air entrainment is an important issue in increasing the coating speed. Is obvious.
【0014】[0014]
【発明が解決しようとする課題】従って、本発明の目的
は、エアナイフ塗工方式、ブレード塗工方式、ロール塗
工方式では実現することが不可能であった高品質な製品
の製造と紙切れなく長時間の生産が可能な安定した操業
性を、カーテン塗工方式を用いることにより実現し、空
気同伴現象に伴う塗工ムラを発生させることなく、高速
塗工が可能な高品質な印刷用塗工紙の製造方法を提供す
ることである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to produce high-quality products which cannot be realized by an air knife coating method, a blade coating method, and a roll coating method, and to cut the paper. Stable operability that enables long-term production is achieved by using the curtain coating method, and high-quality printing coating that enables high-speed coating without generating coating unevenness due to the air entrainment phenomenon. An object of the present invention is to provide a method for manufacturing paper.
【0015】[0015]
【課題を解決するための手段】即ち、本発明の印刷用塗
工紙の製造方法は、顔料と接着剤を主成分とする塗工液
をカーテン塗工方式の装置により原紙に塗工する印刷用
塗工紙の製造方法において、該塗工液の表面張力が40
dyne/cm以下、該塗工液のB型粘度が2000c
ps以下である該塗工液を用いて、スムースター平滑度
が50kPa以下、ステキヒトサイズが5秒以下の原紙
に塗工することを特徴とするものである。In other words, the method for producing a coated paper for printing according to the present invention is a method for coating a base paper with a coating liquid containing a pigment and an adhesive as main components by a curtain coating system. In the method for producing coated paper for coating, the surface tension of the coating liquid is 40
dyne / cm or less, B-type viscosity of the coating liquid is 2000 c
The coating liquid having a smoother smoothness of 50 kPa or less and a Steckigt size of 5 seconds or less is applied to the base paper using the coating liquid of not more than ps.
【0016】[0016]
【発明の実施の形態】以下、本発明の印刷用塗工紙につ
いて、詳細に説明する。本発明の印刷用塗工紙の製造方
法は、カーテン塗工方式にて空気同伴無く、高速での安
定操業が可能な印刷用塗工紙の製造方法であるが、空気
同伴という現象についてもう少し詳細に述べることにす
る。空気同伴に関しては、各種文献、各種専門書に様々
なことが記載されているが、本発明者は、空気同伴に関
して様々な実験を行い、その現象は以下の2つの原因に
より発生するものと結論付けた。即ち、1)速度の上
昇、及び原紙の表面の粗さに比例して、持ち込まれる空
気量が物理的に増加していくということ、2)速度が上
昇するに従って、原紙に対する塗工液の瞬間的な濡れ性
が悪化していくということである。原紙に対する塗工液
の瞬間的な濡れ性という点では、塗工液の面から述べる
と、塗工液の粘度が高すぎると指数関数的に、原紙に対
する濡れ性が悪化することがわかっており、また塗工液
の表面張力の値も低いほど瞬間的な濡れ性が確保できる
ことは既知である。更に、原紙面から述べると、平滑で
あるほど塗工液がアプリケーションされた直後の濡れ広
がりが確保されることは明白であり、塗工液の原紙への
浸込みが多ければ多いほど、この瞬間的な濡れ性は増大
する。これらの結論付けから、本発明の印刷用塗工紙に
おいては、塗工液の濡れ性に大きく影響を与える塗工液
のB型粘度が2000cps以下、表面張力が40dy
ne/cm以下であるため、塗工液の流動性、及び原紙
に対する濡れ性が非常に良好であり、また、本発明に用
いられる原紙は、スムースター平滑度が50kPa以
下、ステキヒトサイズが5秒以下であるため、十分な平
滑性、塗工液に対する十分な瞬間的な濡れ性が確保され
ており、空気同伴現象を発生させることなく、高速で、
高品質な印刷用塗工紙を得ることが可能となることは明
らかである。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the coated paper for printing of the present invention will be described in detail. The method for producing a coated paper for printing according to the present invention is a method for producing a coated coated paper for printing that can be stably operated at a high speed without air entrainment in a curtain coating method. Will be described. Regarding air entrainment, various documents and various technical books describe various things. However, the present inventors conducted various experiments on air entrainment, and concluded that the phenomenon occurred due to the following two causes. I attached. That is, 1) that the amount of air taken in physically increases in proportion to the increase in the speed and the roughness of the surface of the base paper. 2) The instant of the coating liquid applied to the base paper as the speed increases. Is that the wettability becomes worse. In terms of the instantaneous wettability of the coating liquid on the base paper, from the viewpoint of the coating liquid, it has been found that if the viscosity of the coating liquid is too high, the wettability on the base paper deteriorates exponentially. It is known that the lower the surface tension of the coating liquid, the more instantaneous wettability can be secured. Further, from the viewpoint of the base paper, it is clear that the smoother the liquid, the more the wet spread immediately after application of the coating liquid is secured, and the greater the penetration of the coating liquid into the base paper, the more this instant Wettability increases. From these conclusions, in the coated paper for printing of the present invention, the B-type viscosity of the coating liquid which greatly affects the wettability of the coating liquid is 2000 cps or less, and the surface tension is 40 dy.
Ne / cm or less, the fluidity of the coating liquid and the wettability to the base paper are very good. The base paper used in the present invention has a smoother smoothness of 50 kPa or less and a Stekitto size of 5 kPa. Seconds or less, sufficient smoothness, sufficient instantaneous wettability to the coating liquid is secured, without causing air entrainment, at high speed,
It is clear that high quality coated paper for printing can be obtained.
【0017】本発明で用いられる原紙は、特に限定され
るものではなく、LBKP、NBKP等の化学パルプ、
GP,PGW,RMP,TMP,CTMP,CMP,C
GP等を含む機械パルプ、DIP等の古紙パルプを含
み、軽質炭酸カルシウム、重質炭酸カルシウム、タル
ク、クレー、カオリン等の各種填料、サイズ剤、定着
剤、歩留まり向上剤、カチオン化剤、紙力増強剤等の各
種添加剤を含み、酸性または中性もしくはアルカリ性で
抄造される。The base paper used in the present invention is not particularly limited, and chemical pulp such as LBKP and NBKP,
GP, PGW, RMP, TMP, CTMP, CMP, C
Includes mechanical pulp containing GP, etc., waste paper pulp such as DIP, various fillers such as light calcium carbonate, heavy calcium carbonate, talc, clay, kaolin, sizing agent, fixing agent, retention improver, cationizing agent, paper strength It contains various additives such as a strengthening agent and is made into an acidic, neutral or alkaline paper.
【0018】この原紙を抄造する抄紙機は、円網、長
網、ツインワイヤー等の各種フォーマーおよびそれらの
各種フォーマーを組み合わせ、抄き合わせを行う抄紙機
等である。A paper machine for producing the base paper is a variety of formers such as a circular net, a long net, and a twin wire, and a paper machine that combines the various formers to perform a lamination.
【0019】本発明に用いる塗工用顔料は、特に限定さ
れるものではなく、例えば、カオリンクレー、デラミネ
ーテッドクレー、焼成クレー、重質炭酸カルシウム、沈
降性(軽質)炭酸カルシウム、水酸化アルミニウム、タ
ルク、二酸化チタン等が挙げられるが、塗工液の粘度、
印刷用塗工紙の品質設計上の問題から、炭酸カルシウム
を全顔料中20%以上、塗工液中に含有されることが好
ましい。The coating pigment used in the present invention is not particularly limited. For example, kaolin clay, delaminated clay, calcined clay, heavy calcium carbonate, precipitated (light) calcium carbonate, aluminum hydroxide , Talc, titanium dioxide and the like, but the viscosity of the coating liquid,
From the viewpoint of the quality design of the coated paper for printing, it is preferable that calcium carbonate is contained in the coating liquid in an amount of 20% or more of the total pigment.
【0020】本発明に接着剤として用いられる共重合体
ラテックスとしては、スチレン・ブタジエン共重合体等
の共役ジエン系共重合体ラテックス、アクリル酸エステ
ルおよび/またはメタクリル酸エステルの重合体または
共重合体等のアクリル系重合体ラテックス、スチレン・
酢酸ビニル系共重合体等のビニル系重合体ラテックス、
あるいはこれらの各種重合体ラテックスをカルボキシル
基等の官能基含有単量体で変性したアルカリ感応性ある
いはアルカリ非感応性の重合体ラテックス等の共重合体
ラテックス等を用いることができる。特に、顔料結合
力、作業性、コストの面等を考慮して、スチレン・ブタ
ジエン共重合体等の共役ジエン系共重合体ラテックスが
好ましく用いられる。これらの共重合体ラテックスの平
均粒子径は、大きすぎると塗工液の粘度が増加してしま
うという点から、150nm以下が好ましく、その添加
量は、印刷用塗工紙としての品質設計上、5重量部以上
の添加が好ましい。The copolymer latex used as the adhesive in the present invention includes a conjugated diene copolymer latex such as a styrene-butadiene copolymer, and a polymer or copolymer of an acrylate ester and / or a methacrylate ester. Acrylic polymer latex such as styrene
Vinyl polymer latex such as vinyl acetate copolymer,
Alternatively, a copolymer latex such as an alkali-sensitive or alkali-insensitive polymer latex obtained by modifying these various polymer latexes with a functional group-containing monomer such as a carboxyl group can be used. In particular, a conjugated diene-based copolymer latex such as a styrene-butadiene copolymer is preferably used in consideration of the pigment binding force, workability, cost, and the like. The average particle diameter of these copolymer latexes is preferably 150 nm or less from the viewpoint that the viscosity of the coating liquid increases when the average particle diameter is too large, and the amount of addition is preferably in terms of quality design as coated paper for printing. Addition of 5 parts by weight or more is preferred.
【0021】本発明に接着剤として用いられる澱粉とし
て、酸化澱粉、エーテル化澱粉、エステル化澱粉、酵素
変性澱粉やそれらをフラッシュドライして得られる冷水
可溶性澱粉、カゼイン、大豆蛋白などの天然系バインダ
ーなどを併用することができるが、澱粉の添加量を増や
すと塗工液の粘度が増加し、更に印刷用塗工紙としての
品質設計上、その添加量としては6重量部以下が好まし
い。The starch used as an adhesive in the present invention includes oxidized starch, etherified starch, esterified starch, enzyme-modified starch and natural binders such as cold-water-soluble starch, casein and soy protein obtained by flash-drying them. However, when the amount of added starch is increased, the viscosity of the coating liquid is increased, and the amount is preferably 6 parts by weight or less from the viewpoint of quality design as coated paper for printing.
【0022】その他、本発明に用いられる界面活性剤と
しては、カルボン酸塩、スルホン酸塩、硫酸エステル
塩、リン酸エステル塩などのアニオン系界面活性剤、エ
ーテル型、エーテルエステル型、エステル型、含窒素型
などのノニオン系界面活性剤、ベタイン、アミノカルボ
ン酸塩、イミダゾリン誘導体などの両性界面活性剤があ
げられるが、これら界面活性剤の添加量としては、塗工
液の濡れ性の確保、操業上におけるカーテン膜の安定性
の確保という点から、0.1重量部以上添加することが
好ましい。Other surfactants used in the present invention include anionic surfactants such as carboxylate, sulfonate, sulfate and phosphate, ether type, ether ester type, ester type, and the like. Nonionic surfactants such as nitrogen-containing surfactants, betaine, aminocarboxylates, amphoteric surfactants such as imidazoline derivatives, and the like, but the addition amount of these surfactants, wetting of the coating solution, From the viewpoint of ensuring the stability of the curtain film during operation, it is preferable to add 0.1 parts by weight or more.
【0023】さらに、その他一般に使用されている助剤
である分散剤、増粘剤、消泡剤、滑剤、染料、pH調整
剤、保水剤などを適宜使用しても良い。Further, other commonly used auxiliaries such as a dispersant, a thickener, an antifoaming agent, a lubricant, a dye, a pH adjuster, and a water retention agent may be appropriately used.
【0024】本発明における塗工組成物は、上記した各
成分を秤量し、例えば、コーレス分散機、ケディミルの
ような分散機などを用いて配合し、容易に調整できる。The coating composition of the present invention can be easily adjusted by weighing the above-mentioned components and blending them using, for example, a disperser such as a Coreless disperser or a Keddy mill.
【0025】本発明による塗工組成物を原紙に塗工する
方法は、カーテン塗工方式であり、前記原紙の片面、あ
るいは両面に、片面塗工量が絶乾重量で5〜20g/m2
の範囲内、好ましくは10〜20g/m2の範囲内で、オ
ンマシン、オフマシンにより塗工することが出来る。塗
工量が5g/m2より少ないと、実質的にはカーテン膜の
形成が不安定であり、カーテン膜を安定させる手段とし
て、供給流量を増加すべく、塗工液の希釈を余儀なくさ
れるが、例え塗工液を希釈し、カーテン膜を安定させた
としても5g/m2以下では、空気同伴と言うよりも塗工
層のカバリング性という点で十分なカバリングが実現さ
れず、また、乾燥における負荷がかかりコスト的にも満
足のいくものが得られず、本発明の目的には則さない。
また、20g/m2より多いと、確かに空気同伴の改善に
は非常に効果的であるものの、効果は頭打ちとなり、更
にコストの増加を伴うために適さない。The method of applying the coating composition according to the present invention to base paper is a curtain coating method, and the coating amount on one side or both sides of the base paper is 5 to 20 g / m 2 in absolute dry weight.
, Preferably in the range of 10 to 20 g / m 2 , by on-machine and off-machine. If the coating amount is less than 5 g / m 2 , the formation of the curtain film is practically unstable, and the coating liquid must be diluted to increase the supply flow rate as a means for stabilizing the curtain film. However, even if the coating liquid is diluted to stabilize the curtain film, if it is 5 g / m 2 or less, sufficient covering will not be realized in terms of the coating property of the coating layer rather than air entrainment. A load is imposed on drying, and a satisfactory product cannot be obtained in terms of cost, which is not the object of the present invention.
Further, if it is more than 20 g / m 2 , although it is certainly very effective in improving air entrainment, the effect reaches a plateau and is not suitable because the cost is further increased.
【0026】[0026]
【実施例】以下、実施例により本発明を詳しく説明する
が、本発明の内容は実施例に限られるものではない。EXAMPLES The present invention will be described below in detail with reference to examples, but the contents of the present invention are not limited to the examples.
【0027】空気同伴に伴う塗工ムラの評価は、下記の
方法によって行った。製造した塗工紙の塗工層表面を画
像解析し、空気同伴により発生しているピンホール状の
塗工欠陥の面積率を測定し、その発生程度が、××:極
めて多い、×:多い、△:少ない、○:ほとんど無い、
◎:無い、として評価した。なお、印刷用塗工紙を用い
た印刷物として満足できるレベルは、○以上である。Evaluation of coating unevenness accompanying air entrainment was performed by the following method. The coated layer surface of the manufactured coated paper is image-analyzed, and the area ratio of pinhole-shaped coating defects generated by air entrainment is measured. The degree of occurrence is XX: extremely large, X: many , △: little, ○: almost none,
◎: No evaluation was made. The level that can be satisfied as a printed matter using the coated paper for printing is ○ or more.
【0028】実施例1 原紙は、パルプ配合として、市販LBKP(濾水度35
0mlcsf)を30重量部、市販NBKP(濾水度4
20mlcsf)を70重量部、内填する顔料として、
軽質炭酸カルシウムを配分量で10重量%、その他アル
キルケテンダイマー系内填サイズ剤を0.03重量部、
市販カチオン化澱粉を0.02重量部、市販カチオン系
ポリアクリルアミド歩留まり向上剤を0.03重量部で
調整したものを用いた。このようにして作成した原紙の
スムースター平滑度は40kPa、ステキヒトサイズは
4.0秒であった。Example 1 A base paper was prepared by mixing commercially available LBKP (freeness of 35) with pulp.
0 mlcsf), 30 parts by weight of commercially available NBKP (freeness 4
20 mlcsf) as a pigment to be included in 70 parts by weight,
10% by weight of light calcium carbonate in distribution, 0.03 parts by weight of other alkyl ketene dimer-based filling sizing agent,
A commercially available cationized starch adjusted to 0.02 parts by weight and a commercially available cationic polyacrylamide retention improver adjusted to 0.03 parts by weight were used. The smoother smoothness of the base paper thus prepared was 40 kPa, and the Stechigt size was 4.0 seconds.
【0029】次に、顔料として、重質炭酸カルシウム5
0重量部、カオリン50重量部、分散剤としてポリアク
リル酸ソーダを0.4重量部をコーレス分散機を用いて
水に分散し、接着剤として平均粒子径が140nmのス
チレン・ブタジエン系の共重合体ラテックスを10重量
部、リン酸エステル化澱粉を4重量部加えて撹拌し、そ
の後、pHが9.7になるようにNaOHを添加し、界
面活性剤としてアセチレングリコールを0.15重量
部、保水剤としてカルボキシメチルセルロースを0.0
2重量部を添加した後、水を加えて、下記表1に記載の
B型粘度、表面張力の値を有する固形分濃度60%の塗
工組成物を得た。Next, heavy calcium carbonate 5 was used as a pigment.
0 parts by weight, 50 parts by weight of kaolin, and 0.4 parts by weight of sodium polyacrylate as a dispersing agent are dispersed in water using a Cores dispersing machine, and a styrene / butadiene copolymer having an average particle diameter of 140 nm is used as an adhesive. 10 parts by weight of the combined latex and 4 parts by weight of the phosphorylated esterified starch were added and stirred. Then, NaOH was added so that the pH became 9.7, and 0.15 parts by weight of acetylene glycol as a surfactant was added. Carboxymethyl cellulose as a water retention agent
After adding 2 parts by weight, water was added to obtain a coating composition having a B-type viscosity and a surface tension value shown in Table 1 below and having a solid content of 60%.
【0030】次に、塗工組成物を、塗工速度1000m
/minのカーテンコーターを用いて、フェルト面とワ
イヤー面の塗工量がそれぞれ10g/m2と11g/m2、
塗工紙の水分値が6.0重量%になるように塗工し、得
られた長さ10000mの印刷用塗工紙をロール表面温
度60℃、線圧200kg/cm、速度400m/分の
条件でスーパーカレンダー処理し、空気同伴に伴う塗工
ムラを評価した。Next, the coating composition was coated at a coating speed of 1000 m.
/ Min using a curtain coater, the coating amount of the felt surface and wire surface, respectively 10 g / m 2 and 11g / m 2,
The coated paper was coated so that the moisture value became 6.0% by weight, and the obtained coated paper for printing having a length of 10,000 m was rolled at a surface temperature of 60 ° C., a linear pressure of 200 kg / cm, and a speed of 400 m / min. Super calendar treatment was performed under the conditions, and coating unevenness accompanying air entrainment was evaluated.
【0031】実施例2 スチレン・ブタジエン系の共重合体ラテックスの平均粒
子径と添加量、リン酸エステル化澱粉の添加量、界面活
性剤としてのアセチレングリコールの添加量を下記表1
記載の数値になるようにして作成すること以外は実施例
1と同様に行った。Example 2 The average particle size and the amount of styrene / butadiene copolymer latex, the amount of phosphate esterified starch, and the amount of acetylene glycol as a surfactant were shown in Table 1 below.
The procedure was performed in the same manner as in Example 1 except that the sample was prepared so as to have the numerical values described.
【0032】比較例1〜10 スチレン・ブタジエン系の共重合体ラテックスの平均粒
子径と添加量、リン酸エステル化澱粉の添加量、界面活
性剤としてのアセチレングリコールの添加量を下記表1
記載の数値になるようにして作成すること以外は実施例
1と同様に行った。Comparative Examples 1 to 10 The average particle size and amount of styrene / butadiene copolymer latex added, the amount of phosphorylated starch added, and the amount of acetylene glycol added as a surfactant were set forth in Table 1 below.
The procedure was performed in the same manner as in Example 1 except that the sample was prepared so as to have the numerical values described.
【0033】[0033]
【表1】 [Table 1]
【0034】上記表1から明らかなごとく、本発明にお
ける印刷用塗工紙は、空気同伴に伴う塗工ムラの発生が
無い優れた印刷用塗工紙であることが判る。As is clear from Table 1, the printing coated paper in the present invention is an excellent printing coated paper free of coating unevenness caused by air entrainment.
【0035】実施例3 原紙として、下記表2記載のステキヒトサイズ、スムー
スター平滑度になるように市販カチオン化澱粉の添加量
を変えたり、スーパーカレンダーの速度及び線圧を変
え、塗工液としては、顔料として、重質炭酸カルシウム
20重量部、カオリン80重量部、分散剤としてポリア
クリル酸ソーダを0.4重量部をコーレス分散機を用い
て水に分散し、接着剤として平均粒子径が150nmの
スチレン・ブタジエン系の共重合体ラテックスを5重量
部、リン酸エステル化澱粉を6重量部加えて撹拌し、そ
の後、pHが9.7になるようにNaOHを添加し、界
面活性剤としてアセチレングリコールを0.1重量部、
保水剤としてカルボキシメチルセルロースを0.02重
量部を添加した後、水を加えて、固形分濃度60%の塗
工組成物を作成すること以外は実施例1と同様に行っ
た。なお、この塗工生成物のB型粘度は1950cp
s、表面張力は39dyne/cmであった。Example 3 As a base paper, a coating solution was prepared by changing the amount of a commercially available cationized starch, or changing the speed and linear pressure of a super calender so as to obtain the Stechigt size and smoother smoothness shown in Table 2 below. As a pigment, 20 parts by weight of heavy calcium carbonate, 80 parts by weight of kaolin, 0.4 parts by weight of sodium polyacrylate as a dispersant are dispersed in water using a Coreless disperser, and an average particle diameter is used as an adhesive. Was added with 5 parts by weight of a styrene-butadiene-based copolymer latex and 6 parts by weight of phosphorylated esterified starch, followed by stirring. Then, NaOH was added so that the pH became 9.7, and a surfactant was added. 0.1 parts by weight of acetylene glycol as
After adding 0.02 parts by weight of carboxymethylcellulose as a water retention agent, water was added to prepare a coating composition having a solid content concentration of 60% in the same manner as in Example 1. The coating product had a B-type viscosity of 1950 cp.
s, surface tension was 39 dyne / cm.
【0036】実施例4〜6 下記表2記載のステキヒトサイズ、スムースター平滑度
になるように市販カチオン化澱粉の添加量を変えたり、
スーパーカレンダーの速度及び線圧を変えること以外は
実施例3と同様に行った。Examples 4 to 6 The amount of commercially available cationized starch added was changed so as to obtain the Stechigt size and smoother smoothness shown in Table 2 below.
The procedure was performed in the same manner as in Example 3 except that the speed and the linear pressure of the super calender were changed.
【0037】比較例11〜16 下記表2記載のステキヒトサイズ、スムースター平滑度
になるように市販カチオン化澱粉の添加量を変えたり、
スーパーカレンダーの速度及び線圧を変えること以外は
実施例3と同様に行った。Comparative Examples 11 to 16 The amount of the commercially available cationized starch added was changed so that the Stechigt size and smoother smoothness described in Table 2 below were obtained.
The procedure was performed in the same manner as in Example 3 except that the speed and the linear pressure of the super calender were changed.
【0038】[0038]
【表2】 [Table 2]
【0039】上記表2から明らかなごとく、本発明にお
ける印刷用塗工紙は、空気同伴に伴う塗工ムラの発生の
無い優れた印刷用塗工紙であることが判る。また、上記
表1と表2との比較から明らかなごとく、塗工液の表面
張力とB型粘度、原紙のスムースター平滑度とステキヒ
トサイズの値、それぞれ全てがみたされていなければ本
発明の効果が得られないことが判る。As is clear from Table 2 above, the coated paper for printing in the present invention is an excellent coated paper for printing without generation of coating unevenness accompanying air entrainment. Further, as is clear from the comparison between Tables 1 and 2 above, the values of the surface tension and the B-type viscosity of the coating liquid, the smoother smoothness of the base paper, and the Steckigt size were all not found, and the present invention was not considered. It can be seen that the effect of is not obtained.
【0040】[0040]
【発明の効果】本発明の印刷用塗工紙の製造方法は、塗
工液として特定の表面張力、及びB型粘度を有する塗工
液、原紙として特定のスムースター平滑、及びステキヒ
トサイズの値を有し、該原紙に該塗工液をカーテン塗工
方式の塗工装置により塗工することにより、空気同伴に
伴う塗工ムラの発生が無い優れた印刷用塗工紙を製造す
ることが出来る。The method for producing a coated paper for printing according to the present invention comprises a coating liquid having a specific surface tension and a B-type viscosity as a coating liquid, and a specific smoother smoothness and a Stechig size as base paper. By coating the base paper with the coating liquid using a coating apparatus of a curtain coating system, thereby producing an excellent printing coated paper free from coating unevenness accompanying air entrainment. Can be done.
Claims (1)
ーテン塗工方式の塗工装置により原紙に塗工する印刷用
塗工紙の製造方法において、該塗工液の表面張力が40
dyne/cm以下、該塗工液のB型粘度が2000c
ps以下である塗工液を用いて、スムースター平滑度が
50kPa以下、ステキヒトサイズが5秒以下の原紙に
塗工することを特徴とする印刷用塗工紙の製造方法。1. A method for producing a coated paper for printing, in which a coating liquid containing a pigment and an adhesive as main components is applied to a base paper by a curtain coating type coating apparatus, wherein the surface tension of the coating liquid is reduced. 40
dyne / cm or less, B-type viscosity of the coating liquid is 2000 c
A method for producing a coated paper for printing, characterized in that a smoother smoothness of 50 kPa or less and a Stechigt size of 5 seconds or less are applied to a base paper using a coating liquid of ps or less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000071378A JP2001262494A (en) | 2000-03-15 | 2000-03-15 | Method for producing coated paper for printing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000071378A JP2001262494A (en) | 2000-03-15 | 2000-03-15 | Method for producing coated paper for printing |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001262494A true JP2001262494A (en) | 2001-09-26 |
Family
ID=18589973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000071378A Pending JP2001262494A (en) | 2000-03-15 | 2000-03-15 | Method for producing coated paper for printing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2001262494A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005154933A (en) * | 2003-11-25 | 2005-06-16 | Daio Paper Corp | Coated paper for gravure printing |
JP2005154912A (en) * | 2003-11-21 | 2005-06-16 | Oji Paper Co Ltd | Coated printing paper |
JP2008513617A (en) * | 2004-09-17 | 2008-05-01 | ビーエーエスエフ ソシエタス・ヨーロピア | Method for producing a substrate coated in one or more layers with a coating liquid composition containing a binder for adhesion |
JP2009041131A (en) * | 2007-08-08 | 2009-02-26 | Oji Paper Co Ltd | Method for producing coated white paperboard and coated white paperboard |
JP2013241696A (en) * | 2012-05-21 | 2013-12-05 | Nippon A&L Inc | Composition for coating paper for curtain coater |
KR101455187B1 (en) | 2011-03-29 | 2014-10-27 | 니뽄 세이시 가부시끼가이샤 | Coated printing papers and processes for preparing them |
-
2000
- 2000-03-15 JP JP2000071378A patent/JP2001262494A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005154912A (en) * | 2003-11-21 | 2005-06-16 | Oji Paper Co Ltd | Coated printing paper |
JP2005154933A (en) * | 2003-11-25 | 2005-06-16 | Daio Paper Corp | Coated paper for gravure printing |
JP2008513617A (en) * | 2004-09-17 | 2008-05-01 | ビーエーエスエフ ソシエタス・ヨーロピア | Method for producing a substrate coated in one or more layers with a coating liquid composition containing a binder for adhesion |
JP2009041131A (en) * | 2007-08-08 | 2009-02-26 | Oji Paper Co Ltd | Method for producing coated white paperboard and coated white paperboard |
KR101455187B1 (en) | 2011-03-29 | 2014-10-27 | 니뽄 세이시 가부시끼가이샤 | Coated printing papers and processes for preparing them |
JP2013241696A (en) * | 2012-05-21 | 2013-12-05 | Nippon A&L Inc | Composition for coating paper for curtain coater |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5977548B2 (en) | Coated white paperboard and method for producing the same | |
JP4769384B2 (en) | Newspaper for offset printing | |
JP4231531B2 (en) | Newspaper | |
JP2001262494A (en) | Method for producing coated paper for printing | |
JP4906302B2 (en) | Method for producing coated paper for printing | |
JP4619328B2 (en) | Single glossy kraft paper and manufacturing method thereof | |
JP2001262499A (en) | Method for producing coated paper for printing | |
JP4983273B2 (en) | Method for producing coated paper for printing | |
JP4989065B2 (en) | Method for producing coated paper for printing | |
JPH09158085A (en) | Production of coated paper for offset printing and coated paper | |
JP5761680B2 (en) | Method for producing coated paper for printing | |
JP2002129490A (en) | Method for producing printing paper maintaining feeling of base paper | |
JP3230229B2 (en) | Coated paper manufacturing method and coated paper | |
JPH09302596A (en) | Lightweight coated paper and its production | |
JP2009235617A (en) | Method for producing double-sided coated paper for printing | |
JP6116811B2 (en) | Coated white paperboard and method for producing the same | |
JP2008208468A (en) | Coated paper for printing | |
JP2009242998A (en) | Coated paper and its manufacturing method | |
JP4821045B2 (en) | Newspaper for offset printing | |
JP2006336158A (en) | Cast-coated paper | |
JP3761880B2 (en) | Coated paper for gravure printing | |
JPH09170195A (en) | Production of coated paper for offset printing and coated paper | |
JP2013234400A (en) | Method for producing coated paper | |
JP2001262493A (en) | Coated paper for printing and method for producing the same | |
JP2006328564A (en) | Method for producing newsprint paper for offset printing |