JP5328454B2 - Gravure / offset rotary printing paper - Google Patents
Gravure / offset rotary printing paper Download PDFInfo
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- JP5328454B2 JP5328454B2 JP2009088412A JP2009088412A JP5328454B2 JP 5328454 B2 JP5328454 B2 JP 5328454B2 JP 2009088412 A JP2009088412 A JP 2009088412A JP 2009088412 A JP2009088412 A JP 2009088412A JP 5328454 B2 JP5328454 B2 JP 5328454B2
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- 238000000576 coating method Methods 0.000 claims description 53
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- 238000000034 method Methods 0.000 claims description 42
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Landscapes
- Paper (AREA)
Description
本発明は原紙に顔料と特定の接着剤を含む塗工液を塗工・カレンダー処理を行い、優れた印刷品質および印刷作業性に優れるグラビア輪転・オフセット輪転兼用印刷用塗工紙に関する。 TECHNICAL FIELD The present invention relates to a coated paper for gravure / offset rotary printing that is excellent in printing quality and printing workability by applying a coating liquid containing a pigment and a specific adhesive to a base paper and calendering.
グラビア輪転印刷は凹版印刷方式で、印刷物の階調再現性に優れており、雑誌、カタログ、パンフレットなどの商業印刷分野や女性誌等の出版印刷分野で用いられている。一方、オフセット輪転印刷は平版印刷方式で、平滑性の低い用紙でも非常に鮮明に印刷することが可能であり、チラシ、カタログ、パンフレット、ダイレクトメールなどの商業印刷分野に広く用いられている。 Gravure rotary printing is an intaglio printing method that excels in gradation reproducibility of printed matter, and is used in commercial printing fields such as magazines, catalogs, pamphlets, and publication printing fields such as women's magazines. On the other hand, offset rotary printing is a lithographic printing method that can be printed very clearly even on paper with low smoothness, and is widely used in commercial printing fields such as flyers, catalogs, pamphlets, and direct mail.
これらの用紙は通常、グラビア輪転用、オフセット輪転用としてそれぞれ別に使用されており、両方の印刷方式に使用される用紙は非常に低級な用紙以外にはほとんどない。それはグラビア輪転印刷とオフセット輪転印刷では用紙に求められる品質が異なるためである。
グラビア輪転印刷は、金属ロールからなる版全体にインキを与え、次にドクターで、画線部以外のインキをかきとり、凹部にたまったインキを加圧下で紙に転移させる方式である。このため、凹部にあるインキが紙にスムースにかつ均一に転移するためには紙表面の平滑性が必要であり、特に非常に短時間で圧縮された状態での平滑性が重要となってくる。この紙面の平滑性が低い場合には金属ロールと紙の非接触面積が大きくなり、インキが正常に転移しない現象が発生することがある。この現象はミッシングドットと呼ばれるが、印刷品質の低下につながる。このミッシングドットを抑制する方法として平滑性向上とクッション性向上が有効であると言われている。平滑性向上の具体的な方法としては、（１）原紙中の灰分を上げる、（２）スーパーカレンダーでの線圧を高める、（３）クレーやタルクのような平滑性の高い顔料を高配合する等の方法、（４）有機顔料等の顔料を使用する方法知られている。クッション性向上の具体的な方法としては（５）原紙への澱粉サイズを低減もしくは、行わない、（６）原紙のパルプにＧＰなどの機械パルプを高配合する、（７）塗工液中の接着剤にガラス転移温度の低いラテックスを使用する、（８）塗工紙表面を硬くする澱粉を塗料に使用しない等の方法が知られている。実際のグラビア輪転印刷用塗工紙の製造においてはこれらの方法をが組み合わせされて製造しされている。なお、近年はグラビア印刷でインキの転移性を改善するため、印刷紙の後面から電圧をかけ、静電引力によりインキ・セル上のグラビア・インキを盛り上げ、インキ転移性を向上させる静電グラビア印刷が普及してきた。この印刷方式に適した用紙物性も求められている。
一方、オフセット輪転印刷においては、版胴の刷版の非画線部を親水性、画線部を親油性とすることで、印刷時に非画線部上に湿し水をつけ、その後、画線部のみにインキがつけられ、このインキがブランケットを介して、紙に転写される。インキが版からブランケットを介するため、粘度の高い（タック値の高い）インキが使用される。オフセット輪転印刷時のトラブルは高タックのインキを使用することに加えて、湿し水を使用することに起因することが多い。オフセット輪転印刷用紙には表面強度が要求されているが、表面強度が低い用紙をオフセット印刷した場合、紙ムケと呼ばれる印刷表面上に白点が発生し、印刷品質の低下につながる。また、この紙ムケに近い現象で、塗工紙表面の一部が紙粉となってブランケット上に堆積する紙粉パイリング現象が起こり、印刷品質の悪化を招くことがある。さらに１〜２胴目に印刷されたインキが３〜４胴目のブランケット表面に堆積するインキパイリングと呼ばれる現象が起こり、印刷物の画線部に汚れが発生し、印刷品質の低下につながる。
この他にも、オフセット輪転印刷では高温の乾燥機内に印刷後の紙を通して乾燥させるため、ブリスターと呼ばれる印刷物の火ぶくれ現象が起こり、印刷品質の低下につながる。
上記のオフセット輪転印刷時のトラブルを回避するため、以下に示すような方法でオフセット輪転印刷用塗工紙は製造されている。紙ムケおよび紙粉パイリングを抑制するためには塗工紙の表面強度を向上させることが有効であり、通常のオフセット輪転印刷用塗工紙では（１）塗工液中のバインダー（ラテックス、変性澱粉）配合量を多くする、（２）塗工原紙に変性澱粉サイズを行う、などの方法が単独もしくはそれらを組み合わせた方法で行われている。
インキパイリングについてはインキ中の溶剤成分の用紙への吸収が早すぎるために起こるとされている現象であり、（３）粒度分布の狭い顔料を使用する、（４）バインダー配合量増やす等の対策が効果的である。
一方、ブリスター発生を抑制するには原紙層の厚さ方向の強度を高める事と、紙中の水分を低減することが効果的と言われている。具体的には（５）原紙中の灰分減、（６）原紙中の紙力剤増、（７）紙中水分減が有効と言われている。
近年になり、グラビア輪転印刷とオフセット輪転印刷の両方を印刷できる用紙に対するユーザーからの要望が高まっている。１つの用紙で両方の印刷を可能にするためにはグラビア輪転印刷する際にはミッシングドットが少なく、オフセット輪転印刷する際には紙ムケ・インキパイリングが少なく、ブリスター発生がないような印刷作業性に優れた用紙であることが求められる。
それに加えてグラビア輪転印刷用塗工紙、オフセット輪転印刷用塗工紙はともに、ユーザーのコストダウン指向が明瞭になっており、印刷品質が良好であり、かつ低コストであることが必要となってきている。特に近年、抄紙機、コータ、高温ソフトニップカレンダーが一連になっているオンマシンコータになっており、なおかつその抄造速度は１５００ ｍ／ｍｉｎを超えてきており、このような設備で生産できる印刷用塗工紙であることが用紙の低コスト化には非常に重要となってきている。
従来のグラビア輪転印刷用塗工紙の上記製造方法のうち、（１）の方法はオフセット輪転印刷時のブリスター発生や紙ムケにつながり、（２）の方法は近年のコータには設置されておらず、適用できない。また、（３）及び、（４）の方法のようにクレーやタルクのような平滑性の高い顔料や、有機顔料を高配合することは、塗工液の流動性が悪くなり、高速のコータでは塗工することはできず、用紙のコストダウンができない。（５）及び、（８）の方法は塗工紙の表面強度が低くなり、オフセット輪転印刷時の紙ムケにつながる。（６）の方法はＧＰなどのパルプは高速のマシン、コータでは断紙の原因にもなるため、高配合できない。（７）の方法のガラス転移温度が低いラテックスを使用すると高温ソフトニップカレンダーでの汚れの原因になり、生産効率が落ちるため使用できない。
一方、従来のオフセット輪転印刷用塗工紙の上記従来の製造方法のうち、（１）、（２）、（４）、（５）及び、（６）の方法は、グラビア輪転印刷時にミッシングドットの増加につながる。また、（３）は塗工液の流動性が悪くなり、高速のコータでは塗工することはできず、用紙のコストダウンができない。（７）はある程度、可能であるが、紙中水分を低減しすぎると、用紙のクッション性がなくなり、ミッシングドットの増加につながりやすく、また、巻取りに静電気が発生しやすく、巻取りのハンドリングが極めて悪くなるため、紙中の水分には適正な範囲がある。
These papers are usually used separately for gravure and offset rotation, and there are few papers used for both printing methods other than very low-grade paper. This is because gravure rotary printing and offset rotary printing have different quality requirements for paper.
Gravure rotary printing is a method in which ink is applied to the entire plate made of a metal roll, and then the ink other than the image area is scraped off by a doctor, and the ink accumulated in the concave portion is transferred to paper under pressure. For this reason, the smoothness of the paper surface is necessary for the ink in the recesses to be smoothly and uniformly transferred to the paper, and in particular, the smoothness in a compressed state in a very short time becomes important. . When the smoothness of the paper surface is low, the non-contact area between the metal roll and the paper becomes large, and a phenomenon that the ink does not transfer normally may occur. This phenomenon is called a missing dot, but it leads to a decrease in print quality. It is said that improving smoothness and cushioning are effective as a method for suppressing this missing dot. Specific methods for improving smoothness include (1) increasing the ash content in the base paper, (2) increasing the linear pressure in the supercalender, and (3) highly blending highly smooth pigments such as clay and talc. (4) A method using a pigment such as an organic pigment is known. As specific methods for improving cushioning properties, (5) Reduce or do not reduce the starch size to the base paper, (6) Highly blend mechanical pulp such as GP with the base paper pulp, (7) In the coating liquid There are known methods such as using a latex having a low glass transition temperature for the adhesive, and (8) not using starch for hardening the coated paper surface in the paint. In actual production of coated paper for gravure rotary printing, these methods are combined to produce. In recent years, in order to improve ink transferability by gravure printing, electrostatic gravure printing improves the ink transferability by applying voltage from the back of the printing paper and raising gravure ink on the ink cell by electrostatic attraction. Has become popular. Paper physical properties suitable for this printing method are also required.
On the other hand, in rotary offset printing, the non-image area of the plate cylinder is made hydrophilic and the image area is made oleophilic, so that dampening water is applied to the non-image area during printing, and then the image is printed. Ink is applied only to the line portion, and this ink is transferred to the paper through the blanket. Since the ink passes through the blanket from the plate, an ink having a high viscosity (high tack value) is used. Troubles during web offset printing are often caused by using dampening water in addition to using high tack ink. Offset rotary printing paper is required to have surface strength. However, when offset printing is performed on paper having low surface strength, white spots are generated on the printing surface called paper damage, leading to a decrease in print quality. In addition, due to the phenomenon similar to the paper scraping, a paper dust piling phenomenon occurs in which a part of the coated paper surface becomes paper dust and accumulates on the blanket, which may cause deterioration in printing quality. Furthermore, a phenomenon called ink piling occurs in which the ink printed on the first and second cylinders accumulates on the blanket surface of the third and fourth cylinders, stains occur in the image line portion of the printed matter, leading to a decrease in print quality.
In addition, in the rotary offset printing, since the printed paper is dried in a high-temperature dryer, a blistering phenomenon of a printed matter called a blister occurs, leading to a decrease in printing quality.
In order to avoid the trouble at the time of the above-mentioned offset rotary printing, the coated paper for offset rotary printing is manufactured by the following methods. It is effective to improve the surface strength of coated paper in order to suppress paper scraping and paper dust piling. (1) Binder (latex, modified in coating liquid) Methods such as (starch) increasing the blending amount and (2) performing modified starch size on the coated base paper are carried out by a single method or a combination thereof.
Ink piling is a phenomenon that occurs because the solvent component in the ink is absorbed too early on the paper. (3) Use a pigment with a narrow particle size distribution, (4) Measures to increase the amount of binder, etc. Is effective.
On the other hand, increasing the strength of the base paper layer in the thickness direction and reducing the moisture in the paper are said to be effective in suppressing blistering. Specifically, it is said that (5) reduction of ash content in base paper, (6) increase of paper strength in base paper, and (7) reduction of moisture in paper are effective.
In recent years, there has been an increasing demand from users for paper capable of printing both gravure rotary printing and offset rotary printing. In order to enable both printing on a single paper, there are few missing dots when performing gravure rotary printing, and there are few paper smears and ink piling when performing offset rotary printing, and printing workability that does not cause blistering. It is required to be excellent in paper.
In addition, both the gravure rotary coated paper and the offset rotary coated paper are clearly required for users to reduce costs, and must have good print quality and low cost. It is coming. In recent years, in particular, it has become an on-machine coater with a series of paper machines, coaters, and high-temperature soft nip calenders, and the paper making speed has exceeded 1500 m / min. For printing that can be produced with such equipment. Coated paper has become very important for cost reduction of paper.
Among the above-described methods for producing conventional coated paper for gravure rotary printing, the method (1) leads to blister generation and paper smearing during offset rotary printing, and the method (2) has not been installed in recent coaters. Not applicable. In addition, high blending of highly smooth pigments such as clay and talc and organic pigments as in the methods (3) and (4) results in poor fluidity of the coating liquid and high speed coater. However, it cannot be applied, and the cost of paper cannot be reduced. With the methods (5) and (8), the surface strength of the coated paper is lowered, leading to paper smearing during offset rotary printing. In the method (6), a pulp such as GP can cause paper breakage in a high-speed machine or coater, and therefore cannot be highly blended. If a latex having a low glass transition temperature in the method (7) is used, it may cause contamination on a high-temperature soft nip calender and cannot be used because production efficiency decreases.
On the other hand, among the conventional manufacturing methods of the conventional coated paper for rotary offset printing, the methods (1), (2), (4), (5) and (6) are missing dots during gravure rotary printing. Leads to an increase in Further, in (3), the fluidity of the coating liquid is deteriorated, and coating cannot be performed with a high-speed coater, and the cost of the paper cannot be reduced. (7) is possible to some extent, but if the moisture in the paper is reduced too much, the cushioning property of the paper is lost, leading to an increase in missing dots, and static electricity is likely to occur in winding, and handling of winding Is extremely bad, so there is an appropriate range of moisture in the paper.
これまでに、グラビア印刷とオフセット印刷を兼用できる印刷用塗工紙に関するものが、いくつか出願されている。変性澱粉サイズを行った原紙に有機顔料を２〜４０部配合した塗工液を塗工する方法（特許文献１参照）、極微細重質炭酸カルシウムを５〜４５部配合し、中空有機顔料を２〜７部配合、バインダーとして特定のガラス転移温度のラテックスを７〜１１部配合した塗工液を塗工する方法（特許文献２参照）、などが知られている。以上の方法はともに有機顔料を高配合するため、塗料の流動性に劣り、高速での操業性に不向きである。さらに有機顔料自体が高価であるため、低コストの用紙とはならない。 So far, several applications have been filed concerning coated paper for printing that can be used for both gravure printing and offset printing. A method of applying a coating solution containing 2 to 40 parts of an organic pigment to a modified base paper (see Patent Document 1), 5 to 45 parts of ultrafine heavy calcium carbonate, and a hollow organic pigment 2-7 parts mixing | blending, the method (refer patent document 2) etc. which apply | coat the coating liquid which mix | blended 7-11 parts latex of specific glass transition temperature as a binder are known. In both of the above methods, since the organic pigment is highly blended, the fluidity of the paint is inferior and unsuitable for high-speed operability. Furthermore, since the organic pigment itself is expensive, it is not a low-cost paper.
以上のように従来のグラビア輪転印刷用塗工紙、オフセット輪転印刷用塗工紙の製造方法では、グラビア輪転印刷とオフセット輪転印刷の両方に耐えうる優れた印刷品質および印刷作業性に優れ、高速塗工適性に優れる兼用紙が得られていないのが現状である。
本発明の課題は、以上のような状況に鑑み、グラビア輪転印刷の印刷品質・印刷作業性、オフセット輪転印刷の印刷品質、印刷作業性に優れ、生産性の高い優グラビア輪転・オフセット輪転兼用印刷用塗工紙を提供することである。 In view of the situation as described above, the object of the present invention is excellent gravure rotary printing / offset rotary printing that is excellent in print quality / printing workability of gravure rotary printing, printing quality of offset rotary printing, printing workability, and high productivity. Is to provide coated paper.
本発明者らは上記の課題について鋭意研究を重ねた結果、原紙上に顔料と接着剤を主成分とする塗工層を設け、カレンダーによる平滑化処理を行う印刷用塗工紙において特定の顔料組成ならびに特定のカレンダ運転条件にすることで生産性が高く、かつグラビア輪転印刷、オフセット輪転印刷いずれにおいても印刷品質に優れたグラビア輪転印刷・オフセット輪転印刷の兼用紙を製造できることを見出し、本発明を完成するに至った。
上記課題を達成するために、請求項１に係る発明のグラビア輪転・オフセット輪転兼用印刷用塗工紙は、原紙上に顔料と接着剤を主成分とする塗工層を設け、カレンダー処理を行うグラビア輪転・オフセット輪転兼用印刷用塗工紙において、原紙上にブレードにて塗工する塗工液の組成が顔料１００重量部中、炭酸カルシウムが５０重量部未満、かつ変性澱粉が２重量部以上４重量部未満であり、４ニップ以上の高温ソフトニップカレンダの運転条件が、金属ロール表面温度が１８０℃以上２５０℃未満であり、かつ最大ニップ圧２５０ｋＮ／ｍ以上４００kＮ／ｍ未満であることを特徴とする
As a result of intensive studies on the above problems, the present inventors have provided a coating layer mainly composed of a pigment and an adhesive on a base paper, and a specific pigment in a coated paper for smoothing by a calendar. It has been found that the composition and specific calender operation conditions can produce a gravure rotary printing / offset rotary printing paper with high productivity and excellent print quality in both gravure rotary printing and offset rotary printing. It came to complete.
In order to achieve the above object, the gravure / offset rotary printing coated paper of the invention according to claim 1 is provided with a coating layer mainly composed of a pigment and an adhesive on the base paper, and is subjected to a calendar process. In printing paper for gravure / offset rotary printing, the composition of the coating liquid to be coated on the base paper with a blade is less than 50 parts by weight of calcium carbonate and 2 parts by weight or more of modified starch in 100 parts by weight of pigment. It is less than 4 parts by weight, and the operating condition of the high temperature soft nip calender with 4 nips or more is that the metal roll surface temperature is 180 ° C. or more and less than 250 ° C., and the maximum nip pressure is 250 kN / m or more and less than 400 kN / m. Characterize
本発明は、原紙上にブレードにて塗工する塗工液の組成が顔料１００重量部中、炭酸カルシウムが５０重量部未満、かつ変性澱粉が２重量部以上４重量部未満とすることで、塗工層をやわらかくし、後段の高温ソフトニップカレンダ処理による平滑化を容易にする。また、４ニップ以上の高温ソフトニップカレンダの運転条件を金属ロール表面温度が１８０℃以上２５０℃未満とし、かつ最大ニップ圧２５０ｋＮ／ｍ以上４００kＮ／ｍ未満とすることにより、グラビア輪転・オフセット輪転兼用印刷用塗工紙に求められる高い平滑性と高い生産性を両立させることができる。 In the present invention, the composition of the coating liquid to be coated on the base paper with a blade is 100 parts by weight of the pigment, the calcium carbonate is less than 50 parts by weight, and the modified starch is 2 parts by weight or more and less than 4 parts by weight, The coating layer is softened, and smoothing is facilitated by subsequent high-temperature soft nip calendering. Also, the gravure / offset rotation can be performed by setting the operating condition of the high temperature soft nip calender with 4 nips or more to a metal roll surface temperature of 180 ° C or more and less than 250 ° C and a maximum nip pressure of 250kN / m or more and less than 400kN / m. High smoothness and high productivity required for coated paper for printing can be achieved at the same time.
本発明のグラビア輪転・オフセット輪転兼用印刷用塗工紙は、特定の顔料を使用したり、ソフトカレンダーを用いた特定条件での表面処理によって製造することにより、グラビア輪転印刷、オフセット輪転印刷いずれにおいても印刷品質に優れる。 The gravure / offset rotary printing coated paper of the present invention can be used in either gravure rotary printing or offset rotary printing by using a specific pigment or by surface treatment under specific conditions using a soft calender. Also excellent print quality.
本発明においては、抄紙工程、塗工工程だけでなく、表面処理工程までもオンラインで連続的に行うことができるため、塗工紙を高速で製造できるため、生産性を向上させることができる。本発明において高速操業とは１３００ｍ／分以上での操業条件を意味し、本発明によれば、好ましくは１５００ｍ／分以上、より好ましくは１６００ｍ／分以上程度での操業も可能である。
本発明に用いる塗工原紙としては、化学パルプ、古紙パルプ、機械パルプなど製紙用パルプを叩解したパルプスラリーに、必要に応じ通常抄紙工程で使用される填料、例えばタルク、カオリン、重質炭酸カルシウム、軽質炭酸カルシウム、二酸化チタンなどを添加し、さらに薬品類、例えば紙力増強剤、サイズ剤、消泡剤、着色剤などを添加し、抄紙する。
In the present invention, not only the papermaking process and the coating process, but also the surface treatment process can be continuously performed online, and thus the coated paper can be manufactured at high speed, so that productivity can be improved. In the present invention, high-speed operation means an operation condition at 1300 m / min or more, and according to the present invention, operation at 1500 m / min or more, more preferably about 1600 m / min or more is also possible.
The coated base paper used in the present invention includes pulp slurries made from paper pulp such as chemical pulp, waste paper pulp, and mechanical pulp, and fillers that are usually used in the papermaking process as necessary, such as talc, kaolin, and heavy calcium carbonate. Then, light calcium carbonate, titanium dioxide and the like are added, and chemicals such as a paper strength enhancer, a sizing agent, an antifoaming agent, a colorant and the like are further added to make paper.
抄紙方法は特に限定されるものではなく、トップワイヤー等を含む長網マシン、丸網マシン、二者を併用した板紙マシン、ヤンキードライヤーマシン等を用いて、酸性抄紙、中性抄紙、アルカリ性抄紙方式で抄紙した原紙のいずれであってよい。また、サイズプレス、ゲートロールコーター、プレメタリングサイズプレスを使用して、澱粉、ポリビニルアルコールなどの接着剤をクリア塗工した原紙を使用することができる。ただし、本発明においては、クリア塗工を行なっていない原紙が好ましい。澱粉などの水溶性高分子を主成分とする表面処理剤を塗工原紙へ塗工（サイズプレス）することによって、原紙表面が硬くなるため、後続の表面処理工程で微小な凹凸が潰れにくくなり、平滑の発現性が低くなる。 The paper making method is not particularly limited. Acid paper, neutral paper, alkaline paper making using a long net machine including a top wire, a round net machine, a paperboard machine using the two, a Yankee dryer machine, etc. It may be any of the base papers made in step 1. Moreover, the base paper which applied the adhesive agents, such as starch and polyvinyl alcohol, using a size press, a gate roll coater, and a pre metering size press can be used. However, in the present invention, a base paper not subjected to clear coating is preferable. The surface of the base paper is hardened by applying a surface treatment agent based on water-soluble polymers such as starch to the coated base paper (size press), so that minute irregularities are less likely to be crushed in the subsequent surface treatment process. , Smoothness is reduced.
本発明の塗工原紙のパルプ原料としては、機械パルプを使用することができる。機械パルプ以外にも、用途に応じて各種パルプを使用することができ、例えば、脱墨パルプ（ＤＩＰ）、針葉樹クラフトパルプ（ＮＫＰ）、広葉樹クラフトパルプ（ＬＫＰ）など印刷用紙の抄紙原料として一般的に使用されているパルプを単独または組み合わせて適宜使用することができる。機械パルプとしては、砕木パルプ(ＧＰ)、リファイナー砕木パルプ(ＲＧＰ)、サーモメカニカルパルプ(ＴＭＰ)、ケミサーモメカニカルパルプ(ＣＴＭＰ)、ケミグランドパルプ(ＣＧＰ)、セミケミカルパルプ(ＳＣＰ)などが挙げられる。脱墨パルプとしては、上質紙、中質紙、下級紙、新聞紙、チラシ、雑誌などの選別古紙やこれらが混合している無選別古紙を原料とする脱墨パルプなどを使用することができる。また、本発明においては、針葉樹に由来するパルプは２０％未満であることが好ましい。 Mechanical pulp can be used as a pulp raw material for the coated base paper of the present invention. In addition to mechanical pulp, various types of pulp can be used depending on the application. For example, it is commonly used as a papermaking raw material for printing paper such as deinked pulp (DIP), softwood kraft pulp (NKP), and hardwood kraft pulp (LKP). The pulp used in the above can be appropriately used alone or in combination. Examples of the mechanical pulp include groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), chemiground pulp (CGP), semi-chemical pulp (SCP), and the like. . As the deinked pulp, it is possible to use deinked pulp made from selected waste paper such as high quality paper, medium quality paper, lower grade paper, newspaper, flyers, magazines, etc., or unselected waste paper mixed with these. In the present invention, the pulp derived from the conifer is preferably less than 20%.
本発明の塗工原紙の填料としては、必要に応じて公知のものを任意に使用でき、例えば、重質炭酸カルシム、軽質炭酸カルシウム、クレー、シリカ、軽質炭酸カルシウム・シリカ複合物、カオリン、焼成カオリン、デラミカオリン、タルク等を単独で使用し、又は併用できる。紙中填料率は１〜４０固形分重量％が好ましく、１０〜３５固形分重量％がより好ましい。 As the filler for the coated base paper of the present invention, known ones can be arbitrarily used as necessary. For example, heavy calcium carbonate, light calcium carbonate, clay, silica, light calcium carbonate / silica composite, kaolin, baking Kaolin, deramikaolin, talc and the like can be used alone or in combination. The filler content in the paper is preferably 1 to 40% by weight, more preferably 10 to 35% by weight.
本発明の塗工原紙の抄造に用いる内添薬品としては、乾燥紙力向上剤、湿潤紙力向上剤、濾水性向上剤、染料、中性サイズ剤などの薬品を必要に応じて使用してもよい。乾燥紙力向上剤としてはポリアクリルアミド、カチオン化澱粉が挙げられ、湿潤紙力向上剤としてはポリアミドアミンエピクロロヒドリンなどが挙げられる。これらの薬品は地合や操業性などの影響の無い範囲で添加される。中性サイズ剤としてはアルキルケテンダイマーやアルケニル無水コハク酸、中性ロジンサイズ剤などが挙げられる。 As internal chemicals used in the production of the coated base paper of the present invention, chemicals such as dry paper strength improver, wet paper strength improver, drainage improver, dye, neutral sizing agent are used as necessary. Also good. Examples of the dry paper strength improver include polyacrylamide and cationized starch, and examples of the wet paper strength improver include polyamidoamine epichlorohydrin. These chemicals are added within a range that does not affect the formation and operability. Examples of neutral sizing agents include alkyl ketene dimers, alkenyl succinic anhydrides, and neutral rosin sizing agents.
本発明の塗工原紙の抄造に用いられる抄紙機は、特に制限はないが、オントップフォーマー、ギャップフォーマなどの通常の抄紙機が用いられる。特に本発明においては、ヘッドボックスから噴射された紙料が２枚のワイヤーに挟まれて走行し、湿紙の両側からほぼ均等に脱水するギャップフォーマ型抄紙機を用いることが、好適であり、これにより、表裏差のない表面性が良好な原紙が得られ、１３００ｍ／分以上の高速の抄紙速度において安定的に抄紙できる。 The paper machine used for paper making of the coated base paper of the present invention is not particularly limited, but ordinary paper machines such as an on-top former and a gap former are used. In particular, in the present invention, it is preferable to use a gap former type paper machine that travels while the stock sprayed from the head box is sandwiched between two wires and dehydrates almost evenly from both sides of the wet paper, As a result, a base paper having good surface properties with no difference between the front and the back can be obtained, and paper can be stably made at a high paper making speed of 1300 m / min or more.
本発明の抄紙工程においては、抄紙機プレドライヤー、アフタードライヤーも公用の装置を用いることができ、乾燥条件も特に限定はなく、通常の操業範囲で適宜設定できる。 In the paper making process of the present invention, a paper machine pre-dryer and an after-dryer can use public equipment, and drying conditions are not particularly limited, and can be appropriately set within a normal operating range.
本発明において塗工原紙の坪量は、次の工程である塗工工程とのバランスを取りながら設定することができ、例えば、原紙坪量を３０〜６０ｇ／ｍ２程度にすることができる。 In the present invention, the basis weight of the coated base paper can be set while keeping a balance with the subsequent coating step, for example, the base paper basis weight can be about 30 to 60 g / m 2 .
本発明においては、オンラインソフトキャレンダ、オンラインチルドカレンダなどにより塗工前の原紙にプレカレンダー処理を行い、原紙を予め平滑化しておくことが、塗工後の塗工層を均一化する上で好ましい。この場合、処理線圧は、好ましくは３０〜１００ｋＮ／ｍ、より好ましくは５０〜１００ｋＮ／ｍである。また、プレカレンダー処理する際の原紙の水分率も重要であり、水分率は３〜５％が好ましい。水分率が３．０％未満であると用紙水分が低いことからプレカレンダー処理を施しても、十分な平滑性が得られにくい。また、５．０％を超えると紙中水分が高いことから、カレンダー処理により原紙がつぶれやすくなり、十分な平滑性が得られるものの、用紙を潰しすぎるため不透明度や剛度が低下しやすい。本発明において用いられる顔料は、炭酸カルシウムであるが、炭酸カルシウムの含有量は全顔料（１００重量部）中、５５重量部未満、好ましくは２０〜５０重量部である。５５重量部を超えると、塗工層の平滑性低下の影響によってグラビア印刷適性、とりわけミッシングドットが多発し、印刷物のハイライト部の再現が悪くなるため、好ましくない。
炭酸カルシウムの平均粒子径は、塗工層の高い平滑性発現の観点からレーザー回折法で、０．３〜１．２μｍが好ましく、より好ましくは、０．５〜１．０μｍである。また、炭酸カルシウム以外の顔料としては、たとえばカオリン、プラスチックピグメントなどの有機顔料、タルクであれば何でもよいが、塗工面をより高平滑化するためには顔料形状が板状であるカオリンがより好ましい。カオリンの配合量は、グラビア印刷適性、塗工層の平滑性の点から顔料１００重量部あたり５０重量部以上が好ましく、より好ましくは７０重量部以上である。カオリンの平均粒子径は、グラビア印刷適性、および塗料の高せん断速度における流動性を高める、すなわちハイシェア粘度を低下させ、ブレードによる高速塗工により平滑な塗工層を形成させる点から、平均粒子径が０．１〜０．７μｍが好ましく、より好ましくは０．１〜０．４μｍである。ただし、一般的にグラビア印刷用塗工紙に用いられる顔料であるデラミクレー、焼成クレー、タルクなどは塗料流動性を悪化させるため、その配合割合は３０％未満であることが好ましい。
In the present invention, pre-calendar processing is performed on the base paper before coating by an online soft calendar, online chilled calendar, etc., and smoothing the base paper in advance makes the coating layer after coating uniform. preferable. In this case, the treatment linear pressure is preferably 30 to 100 kN / m, more preferably 50 to 100 kN / m. Moreover, the moisture content of the base paper at the time of pre-calendering is also important, and the moisture content is preferably 3 to 5%. If the moisture content is less than 3.0%, the paper moisture is low, so that it is difficult to obtain sufficient smoothness even if pre-calendar treatment is performed. On the other hand, if it exceeds 5.0%, the water content in the paper is high, so that the base paper is easily crushed by the calendar process, and sufficient smoothness can be obtained, but the opacity and rigidity are liable to decrease because the paper is crushed too much. The pigment used in the present invention is calcium carbonate, and the content of calcium carbonate is less than 55 parts by weight, preferably 20 to 50 parts by weight in the total pigment (100 parts by weight). Exceeding 55 parts by weight is not preferable because gravure printing suitability, particularly, missing dots occur frequently due to the influence of a decrease in smoothness of the coating layer, and reproduction of a highlight portion of a printed matter is deteriorated.
The average particle diameter of calcium carbonate is preferably 0.3 to 1.2 μm, and more preferably 0.5 to 1.0 μm by laser diffraction from the viewpoint of high smoothness expression of the coating layer. Further, as the pigment other than calcium carbonate, any organic pigment such as kaolin and plastic pigment, and talc may be used. However, in order to make the coated surface more smooth, kaolin having a plate shape is more preferable. . The blending amount of kaolin is preferably 50 parts by weight or more, more preferably 70 parts by weight or more per 100 parts by weight of the pigment from the viewpoints of gravure printability and coating layer smoothness. The average particle size of kaolin is suitable for gravure printing and the fluidity at high shear rate of the paint, that is, to reduce the high shear viscosity and to form a smooth coating layer by high-speed coating with a blade. Is preferably 0.1 to 0.7 μm, more preferably 0.1 to 0.4 μm. However, delamination clay, calcined clay, talc, and the like, which are pigments generally used for coated paper for gravure printing, deteriorate the paint fluidity, and therefore the blending ratio is preferably less than 30%.
本発明の塗工液に用いられるバインダは合成高分子ラテックスおよび変性澱粉である。このうち、変性澱粉は顔料１００重量部中、４重量部未満かつ２重量部以上である必要がある。４重量部以上では紙面に形成される塗工層を硬化し、後段の高温ソフトニップカレンダによる平滑化がしにくくなる。また、２重量部未満では塗工液の保水性が低下することから、ブレードに汚れが多発し、長時間操業が困難になる。グラビア印刷時のミッシングドット抑制には変性澱粉の配合量を減少させることは有効であるが、オフセット輪転印刷時のインキパイリングは多発する傾向にあり、印刷品質を低下させる。変性澱粉としては、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が挙げられる。また、本発明で使用する合成高分子ラテックスとしては一般的な塗被紙の製造に用いられるスチレン・ブタジエン・アクリルニトリル系共重合体ラテックスを用いる。モノマーとしてはスチレン、ブタジエン、アクリロニトリル等の他、その他ビニル化合物、メチルメタアクリレート他ビニル系不飽和カルボン酸エステル化合物や、あるいはアクリル酸、フマル酸等ビニル系不飽和カルボン酸を用いるのが好ましい。さらに、ガラス転移温度はグラビア印刷適性や、オフセット印刷適性点から概ね２０℃未満であることが好ましく、より好ましくは０〜２０℃である。この他にもカゼイン、大豆蛋白等の天然系接着剤などの一般に知られた接着剤も上記条件を満たせば使用可能である。また、必要に応じて、分散剤、増粘剤、保水剤、消泡剤、耐水化剤、着色剤、蛍光増白剤等、通常の塗工液に配合される各種助剤が適宜使用できる。
かくして調製された塗工組成物は一般の塗工紙製造に用いられているブレードコータ等の塗工装置を設けたオンマシンあるいはオフマシンコータによって原紙上に単層あるいは多層塗工される。本発明においては、塗工速度が１３００ｍ／分以上、好ましくは１４００ｍ／分以上、より好ましくは塗工速度が１６００ｍ／分以上の高速塗工適性にも優れるものである。その際、塗工液固形分濃度は６０〜７０％であることが好ましい。また、原紙としては一般の印刷用塗工紙に用いられる坪量３０〜１００ｇ／ｍ２の原紙が好ましく、必要に応じて上質紙、中質紙を選択して使用する。原紙を構成するパルプのうち、針葉樹に由来するパルプは２０％未満であることが好ましい。塗工液の塗工量は、原紙片面当たり、固形分で７〜２０ｇ／ｍ２の範囲で塗工するのが好ましい。
本発明において湿潤塗工層を乾燥させる方法としては、例えば、蒸気加熱シリンダー、電気ヒータドライヤー、赤外線ヒータドライヤー、高周波ヒータドライヤー等各種の方法が単独または併用して用いられる。
本発明の塗工紙は、抄紙、塗工の後、顔料塗工層を表面処理するものである。特に本発明においては、金属ロールと弾性ロールで構成されるオンラインソフトカレンダーを用いて特定条件下で表面処理を行うことによって、塗工紙を過度に高密度化することなく、平滑度を向上させることができ、ミッシングドットが発生しにくい塗工紙を高い生産性で製造することができる。本発明の塗工紙の表面処理は、金属ロールと弾性ロールで構成されるホットニップ（熱）ソフトカレンダーを用いて、４ニップ以上のソフトカレンダー処理で行われ、好ましくは６〜８ニップである。
４ニップ以上の高温ソフトニップカレンダの運転条件は、最も高温の金属ロール表面温度が１８０℃以上である。好ましくは１９０℃以上、２５０℃未満である。金属ロール表面温度が１８０℃未満であると高速塗工時に平滑化処理が不完全となる。また、２５０度以上では金属ロールと対をなす弾性ロールの耐久性を阻害し、破損のリスクが増大する為、安全上好ましくない。
高温ソフトニップカレンダ処理線圧については、４ニップ以上の多段にて最大ニップ圧２５０ｋＮ／ｍ以上４００kＮ／ｍ未満である。２５０kＮ／ｍ未満だと、グラビア印刷時のミッシングドット軽減に不十分であり、４００kＮ／ｍ以上では金属ロールと対をなす弾性ロールの耐久性を阻害するため、好ましくない。
高温ソフトニップカレンダによる平滑処理の効果は、処理速度にも依存する。そのため、より好ましくは、ライン速度（単位：ｍ／ｍｉｎ）をｘ、最大ニップ圧（：ｋＮ／ｍ）をｙとした場合、ｙ≧０．１６ｘかつ１３００≦ｘ≦１８００である。ｘ＞１８００の場合、塗工仕上がりがむら状になる。また、１３００＞ｘの場合は，良好な品質のグラビア輪転・オフセット輪転兼用印刷用塗工紙が得られるものの、生産性が低く、好ましくない。
なお、いずれの顔料配合、カレンダー処理条件を選定したとしてもカレンダー処理後の用紙のＰＰＳラフネスが１．６μｍ以下、好ましくは１．３μm以下であることによってミッシングドットを抑制することができる。
上記のような条件で製造されることでグラビア輪転印刷の印刷品質・印刷作業性、オフセット輪転印刷の印刷品質、印刷作業性に優れ、生産性の高いグラビア輪転・オフセット輪転兼用塗工紙が製造できる。
The binder used in the coating solution of the present invention is a synthetic polymer latex and modified starch. Among these, the modified starch needs to be less than 4 parts by weight and 2 parts by weight or more in 100 parts by weight of the pigment. If it is 4 parts by weight or more, the coating layer formed on the paper surface is cured, and smoothing by the subsequent high-temperature soft nip calender becomes difficult. On the other hand, if the amount is less than 2 parts by weight, the water retention of the coating solution is lowered, so that the blade is frequently contaminated, making it difficult to operate for a long time. Although it is effective to reduce the blending amount of the modified starch to suppress the missing dots during gravure printing, ink piling tends to occur frequently during offset rotary printing, which lowers the print quality. Examples of the modified starch include oxidized starch, etherified starch, esterified starch, enzyme-modified starch and cold water-soluble starch obtained by flash drying them. Further, as the synthetic polymer latex used in the present invention, a styrene / butadiene / acrylonitrile copolymer latex used for the production of general coated paper is used. As the monomer, it is preferable to use styrene, butadiene, acrylonitrile and the like, other vinyl compounds, methyl methacrylate and other vinyl unsaturated carboxylic acid ester compounds, and vinyl unsaturated carboxylic acids such as acrylic acid and fumaric acid. Furthermore, the glass transition temperature is preferably less than 20 ° C., more preferably 0 to 20 ° C., from the point of gravure printing suitability and offset printing suitability. In addition, generally known adhesives such as natural adhesives such as casein and soybean protein can be used as long as the above conditions are satisfied. Moreover, various auxiliary agents blended in a normal coating solution, such as a dispersant, a thickener, a water retention agent, an antifoaming agent, a water-resistant agent, a colorant, and a fluorescent brightening agent, can be used as necessary. .
The thus-prepared coating composition is applied to a single layer or multiple layers on a base paper by an on-machine or off-machine coater provided with a coating device such as a blade coater used in general coated paper production. In the present invention, the coating speed is 1300 m / min or more, preferably 1400 m / min or more, more preferably high-speed coating suitability with a coating speed of 1600 m / min or more. In that case, it is preferable that the coating liquid solid content concentration is 60 to 70%. Further, as the base paper, a base paper having a basis weight of 30 to 100 g / m 2 used for general printing coated paper is preferable, and high-quality paper and medium-quality paper are selected and used as necessary. Of the pulp constituting the base paper, the pulp derived from the conifer is preferably less than 20%. The coating amount of the coating liquid is preferably applied in the range of 7 to 20 g / m 2 in terms of solid content per one side of the base paper.
In the present invention, as a method for drying the wet coating layer, various methods such as a steam heating cylinder, an electric heater dryer, an infrared heater dryer, and a high-frequency heater dryer are used alone or in combination.
The coated paper of the present invention is for surface treatment of the pigment coating layer after papermaking and coating. In particular, in the present invention, smoothness is improved without excessively densifying the coated paper by performing surface treatment under specific conditions using an on-line soft calendar composed of a metal roll and an elastic roll. Thus, coated paper that is less prone to missing dots can be produced with high productivity. The surface treatment of the coated paper of the present invention is performed by a soft calender treatment of 4 nips or more using a hot nip (heat) soft calender composed of a metal roll and an elastic roll, preferably 6 to 8 nips. .
The operating condition of the high temperature soft nip calender of 4 nips or more is that the hottest metal roll surface temperature is 180 ° C. or more. Preferably it is 190 degreeC or more and less than 250 degreeC. When the surface temperature of the metal roll is less than 180 ° C., the smoothing process becomes incomplete during high-speed coating. On the other hand, if it is 250 ° or more, the durability of the elastic roll paired with the metal roll is hindered and the risk of breakage increases, which is not preferable for safety.
The high-temperature soft nip calendering linear pressure is a maximum nip pressure of 250 kN / m or more and less than 400 kN / m in multiple stages of 4 nips or more. If it is less than 250 kN / m, it is insufficient for reducing the missing dots at the time of gravure printing, and if it is 400 kN / m or more, the durability of the elastic roll paired with the metal roll is hindered.
The effect of the smoothing process by the high temperature soft nip calender also depends on the processing speed. Therefore, more preferably, when the line speed (unit: m / min) is x and the maximum nip pressure (: kN / m) is y, y ≧ 0.16x and 1300 ≦ x ≦ 1800. When x> 1800, the coating finish is uneven. Further, in the case of 1300> x, although a good quality gravure / offset rotary printing coated paper can be obtained, productivity is low, which is not preferable.
Regardless of which pigment blending and calendering conditions are selected, missing dots can be suppressed when the PPS roughness of the paper after calendering is 1.6 μm or less, preferably 1.3 μm or less.
Manufactured under the above-mentioned conditions, high-productivity gravure / offset rotary coated paper is produced with excellent print quality and printing workability for gravure rotary printing, printing quality for offset rotary printing, and printing workability. it can.
以下に本発明を実施例および比較例をあげてより詳細に説明するが、当然ながら、本発明は実施例のみに限定されるものではない。なお、例中の部および％はそれぞれ重量部および重量％を示す。
［品質評価方法］
（１）ミッシングドット測定方法：大蔵省印刷局式グラビア印刷試験機（熊谷理機工業（株）製）を用い、ザーンカップ（オリフィス径２ｍｍ）からの排出時間が４０秒になるように粘性を調整したインキを用い、印刷速度５０ｍ／ｍｉｎ、印圧２０ｋｇｆ／ｃｍ で印刷し、印刷された塗工紙の網点欠落状態を２０％ハーフトーン部のミッシングドット数（スペックル数）を目視により計数し、１０個未満 ○、１０個〜４９個 △、５０個以上 ×、で評価した。
（２）インキパイリング測定方法：オフセット輪転印刷機（Ｂ２Ｔ−６００：東芝機械製）で東洋インキ製造（株）のレオエコーＬのインキを用い、印刷速度５００ｒｐｍで２００００万部印刷を行い、３胴めおよび４胴目のブランケットの状況を目視評価し、いずれか悪い方の目視評価 ◎（全く発生しない）、○（ほとんど発生しない）、△（発生する）、×（発生が著しい）、で評価した。
（４）高速塗工適性：塗工時にブリーディングの発生状況を目視で観察し、◎全く発生しない、○ほとんど発生しない、△発生する、×発生が著しい、で評価した。
（５）ＰＰＳラフネス測定方法：ＪＩＳ Ｐ８１５１に準拠し、熊谷理機工業（株）製のＰＰＳラフネス測定機を用いてクランプ圧９８０ｋＰａ、ハードパッキンの条件で測定した。
The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the examples. In addition, the part and% in an example show a weight part and weight%, respectively.
[Quality evaluation method]
(1) Missing dot measurement method: Using the Ministry of Finance Printing Bureau type gravure printing tester (manufactured by Kumagai Riki Kogyo Co., Ltd.), adjust the viscosity so that the discharge time from the Zahn cup (orifice diameter 2 mm) is 40 seconds. The printed ink was printed at a printing speed of 50 m / min and a printing pressure of 20 kgf / cm 2, and the number of missing dots (number of speckles) in the 20% halftone portion was visually counted for the dot missing state of the printed coated paper. Less than 10 o, 10 to 49 Δ, 50 or more ×, and evaluated.
(2) Ink piling measurement method: Using an offset rotary printing press (B2T-600: manufactured by Toshiba Machine), Toyo Ink Mfg. Co., Ltd. Leo Echo L ink was used to print 20 million copies at a printing speed of 500 rpm. And the condition of the blanket of the 4th cylinder was visually evaluated, and the worse one was visually evaluated: ◎ (not generated at all), ○ (not generated almost), △ (generated), × (occurrence occurred significantly). .
(4) Suitability for high-speed coating: The state of occurrence of bleeding was visually observed at the time of coating, and evaluation was made as follows: ◎ not generated at all, ○ hardly generated, △ generated, x generated significantly.
(5) PPS roughness measurement method: Based on JIS P8151, measurement was performed using a PPS roughness measuring machine manufactured by Kumagaya Rikyu Kogyo Co., Ltd. under a clamping pressure of 980 kPa and hard packing conditions.
［実施例１］
広葉樹クラフトパルプ（ＬＢＫＰ）を６５部、針葉樹クラフトパルプ（ＮＢＫＰ）を１５部、古紙パルプ（ＤＩＰ）を２０部含有するパルプスラリーを調成し、填料として軽質炭酸カルシウムを９部、内添紙力剤としてカチオン性紙力増強剤を対パルプ０．５％添加して紙料を調成した。
[Example 1]
A pulp slurry containing 65 parts of hardwood kraft pulp (LBKP), 15 parts of softwood kraft pulp (NBKP) and 20 parts of waste paper pulp (DIP) was prepared, and 9 parts of light calcium carbonate as a filler, internal paper strength A paper stock was prepared by adding 0.5% of a cationic paper strength enhancer to the pulp as an agent.
この紙料を用いて、抄紙速度が１６００ｍ／分にて、ギャップ形式のフォーマーを有する抄紙機で抄紙して、坪量３７ｇ／ｍ２の原紙を得た。 Using this stock, paper was made with a paper machine having a gap type former at a paper making speed of 1600 m / min to obtain a base paper having a basis weight of 37 g / m 2 .
次に、顔料として微粒重質炭酸カルシウムであるＦＭＴ−９７(ファイマテック社製)５０部、微粒カオリンであるハイドラグロス（ＣａＭｉｎ社製）５０部を配合し、全顔料に対してモノマー組成が主にスチレンおよびブタジエンである合成高分子ラテックス（以後ＳＢラテックスＴｇ＝１６℃、ゲル含量８０％）を７部、リン酸エステル化澱粉３部配合して固形分濃度６５％で塗工液を調製した。かくして、調製された塗工液を坪量３７ｇ／ｍ２の原紙にブレードコータで塗工量片面あたり１０ｇ／ｍ２になるように、塗工速度１４００／分で両面に塗工して乾燥した。さらに高温ソフトニップカレンダで６ニップ、最高処理温度２００℃、最高処理線圧３００ｋN／ｍの条件で表面処理してグラビア輪転・オフセット輪転兼用印刷用塗工紙を得た。
実施例においては、抄紙、塗工、表面処理を連続してオンラインで行ったため、塗工速度、カレンダー速度も１４００ｍ／分であった。
［実施例２］
原紙を坪量４２ｇ／ｍ２原紙とした以外は実施例１と同条件でグラビア輪転・オフセット輪転兼用印刷用塗工紙を得た。
［実施例３］
塗工速度を１６００ｍ／分とした以外は実施例１と同条件でグラビア輪転・オフセット輪転兼用印刷用塗工紙を得た。
Next, 50 parts of FMT-97 (manufactured by Phimatech), which is fine heavy calcium carbonate, and 50 parts of hydra gloss (manufactured by CaMin), which is fine kaolin, are blended as pigments. 7 parts of synthetic polymer latex (hereinafter referred to as SB latex Tg = 16 ° C., gel content 80%) and 3 parts of phosphate esterified starch were mixed with styrene and butadiene to prepare a coating solution with a solid content of 65%. . Thus, the prepared coating solution was applied to both sides of a base paper having a basis weight of 37 g / m 2 with a blade coater so that the coating amount was 10 g / m 2 per side at a coating speed of 1400 / min and dried. . Further, surface treatment was performed with a high temperature soft nip calender 6 nips, a maximum processing temperature of 200 ° C. and a maximum processing linear pressure of 300 kN / m to obtain a coated paper for gravure / offset rotary printing.
In the examples, since papermaking, coating, and surface treatment were continuously performed online, the coating speed and calendar speed were also 1400 m / min.
[Example 2]
A gravure / offset rotary printing coated paper was obtained under the same conditions as in Example 1 except that the base paper was a basis weight of 42 g / m 2 base paper.
[Example 3]
A gravure / offset rotary printing coated paper was obtained under the same conditions as in Example 1 except that the coating speed was 1600 m / min.
［実施例４］
顔料としてＦＭＴ−９７(ファイマテック社製）２５部、ハイドラグロス（ＣａＭｉｎ社製）７５部を配合した以外は実施例１と同様に行い、グラビア輪転・オフセット輪転兼用印刷用塗工紙を得た。
［実施例５］
顔料として２級カオリンであるＫＣＳ（ＩＭＥＲＹＳ社製）５５部、ＦＭＴ−９７(ＦＭＴ社製）４５部加え、リン酸エステル化澱粉を２部配合し、塗工速度１６００ｍ／分とした以外は実施例１と同条件でグラビア輪転・オフセット輪転兼用印刷用塗工紙を得た。
[Example 4]
Except that 25 parts of FMT-97 (manufactured by Phimatech) and 75 parts of hydra gloss (manufactured by CaMin) were blended as pigments, the same procedure as in Example 1 was carried out to obtain a coated paper for gravure / offset rotary printing. .
[Example 5]
Implemented except that 55 parts of KCS (made by IMERYS), 45 parts of secondary kaolin as pigment, 45 parts of FMT-97 (made by FMT) were added, and 2 parts of phosphate esterified starch were blended and the coating speed was 1600 m / min. Under the same conditions as in Example 1, a coated paper for gravure / offset rotary printing was obtained.
［比較例１］
顔料としてＦＭＴ−９７(ファイマテック社製）５５部、微粒カオリンであるハイドラグロス（ＣａＭｉｎ社製）４５部を配合し、リン酸エステル化澱粉４部配合とし、１５００ｍ／分でカレンダ処理を行った以外は実施例１と同様に行い、塗工紙を得た。
[Comparative Example 1]
As a pigment, 55 parts of FMT-97 (manufactured by Phimatech) and 45 parts of hydra gloss (manufactured by CaMin) as fine kaolin were blended to form 4 parts of phosphate esterified starch, which was calendered at 1500 m / min. Was performed in the same manner as in Example 1 to obtain a coated paper.
［比較例２］
顔料としてＦＭＴ−９７(ファイマテック社製）６５部、２級カオリンであるＫＣＳ（ＩＭＥＲＹＳ社製）３５部を配合し、リン酸エステル化澱粉２部配合とし、１５５０ｍ／分でカレンダ処理を行った以外は実施例１と同様に行い、塗工紙を得た。
[Comparative Example 2]
As a pigment, 65 parts of FMT-97 (manufactured by Pimatech), 35 parts of KCS (manufactured by IMERYS), which is a secondary kaolin, were blended with 2 parts of phosphate esterified starch and calendered at 1550 m / min. Was performed in the same manner as in Example 1 to obtain a coated paper.
［比較例３］
顔料として微粒重質炭酸カルシウムであるＦＭＴ−９７(ファイマテック社製))７０部、微粒カオリンであるハイドラグロス（ＣａＭｉｎ社製）３０部を配合し、ＳＢラテックスを８部、リン酸エステル化澱粉５部配合して固形分濃度６６％で塗料を調製した。かくして調製された塗料を坪量３７ｇ／ｍ２の原紙（パルプ組成として広葉樹クラフトパルプ（ＬＢＫＰ）を６５部、針葉樹クラフトパルプ（ＮＢＫＰ）を２０部、古紙パルプ（ＤＩＰ）を１５部）にブレードコータで塗工量片面あたり９ｇ／ｍ２になるように、塗工速度１６００／分で両面塗工した。さらに高温ソフトニップカレンダで６ニップ、最高処理温度２００℃、最高処理線圧２００ｋN／ｍの条件で表面処理して印刷用塗工紙を得た。
[Comparative Example 3]
As a pigment, 70 parts of fine heavy calcium carbonate FMT-97 (manufactured by Phimatech Co., Ltd.) and 30 parts of fine kaolin hydra gloss (CaMin Co., Ltd.) are blended, 8 parts of SB latex, phosphated starch 5 parts was blended to prepare a paint with a solid content concentration of 66%. A blade coater of the paint thus prepared on a base paper having a basis weight of 37 g / m 2 (65 parts of hardwood kraft pulp (LBKP), 20 parts of softwood kraft pulp (NBKP) and 15 parts of waste paper pulp (DIP)). Thus, double-side coating was performed at a coating speed of 1600 / min so that the coating amount was 9 g / m 2 per one side. Further, the coated paper for printing was obtained by surface treatment under conditions of 6 nips with a high temperature soft nip calender, a maximum processing temperature of 200 ° C., and a maximum processing linear pressure of 200 kN / m.
［比較例４］
顔料として微粒重質炭酸カルシウムであるＦＭＴ−９７(ファイマテック社製）５５部、２級カオリンであるＫＣＳ（ＩＭＥＲＹＳ社製）４５部を配合し、ＳＢラテックスを６．５部、プラスチックピグメント４部を配合して固形分濃度６２％で塗料を調製した。かくして調製された塗料を、坪量４２ｇ／ｍ２の原紙（パルプ組成として広葉樹クラフトパルプ（ＬＢＫＰ）を５０部、針葉樹クラフトパルプ（ＮＢＫＰ）を３０部、古紙パルプ（ＤＩＰ）を２０部）にブレードコータで塗工量片面あたり１０ｇ／ｍ２になるように、塗工速度９００ｍ／分で両面塗工した。さらにスーパーカレンダで７００ｍ／分にて表面処理して印刷用塗工紙を得た。
[Comparative Example 4]
As a pigment, 55 parts of fine heavy calcium carbonate FMT-97 (manufactured by Pimatech), 45 parts of secondary kaolin KCS (manufactured by IMERYS) 45 parts, SB latex 6.5 parts, plastic pigment 4 parts A paint was prepared with a solid content concentration of 62%. The paint thus prepared was bladed on a base paper of 42 g / m 2 in basis weight (50 parts of hardwood kraft pulp (LBKP), 30 parts of softwood kraft pulp (NBKP) and 20 parts of waste paper pulp (DIP)). Double-side coating was performed at a coating speed of 900 m / min so that the coating amount was 10 g / m 2 per side with a coater. Furthermore, surface treatment was performed at 700 m / min with a super calender to obtain a coated paper for printing.
[比較例５]
顔料としてエンジニアードカオリンＣａｐｉｍ ＤＧ（ＩＭＥＲＹＳ社製）８５部、２級カオリンであるＫＣＳ（ＩＭＥＲＹＳ社製）１５部を配合し、ＳＢラテックス７部配合、リン酸エステル化澱粉４部配合とし、１０００ｍ／分で塗工した以外は比較例４と同様に行い、塗工紙を得た。
以上の結果を表１に示した。
[Comparative Example 5]
As a pigment, 85 parts of engineered kaolin Capim DG (manufactured by IMERYS), 15 parts of KCS (manufactured by IMERYS), which is a secondary kaolin, is blended with 7 parts of SB latex and 4 parts of phosphorylated starch, and 1000 m / A coated paper was obtained in the same manner as in Comparative Example 4 except that coating was performed in minutes.
The above results are shown in Table 1.
表１の実施例１〜５、比較例１〜５の結果は以下のことを示している。
実施例１〜５は、炭酸カルシウム配合部数がいずれも５５重量部未満で、変性澱粉部数は２部以上、４部未満であり、カレンダ処理速度は１４００ｍ／ｍｉｎから１６００ｍ／ｍｉｎの範囲である。これらのサンプルのPPSラフネスはいずれも１．６μｍ未満であり、いずれもグラビア印刷適性およびオフセット輪転印刷適性は△評価以上であり、両適性に優れるグラビア輪転・オフセット輪転兼用印刷用塗工紙である。
比較例１は変性澱粉が４部、また比較例１および２は、いずれも炭酸カルシウム配合部数が５５重量部以上である。これらのPPSラフネスはいずれも１．６μｍを僅かに超え、グラビア印刷適性についてはやや劣る。
比較例３は典型的なオフセット輪転機用塗工紙であり、優れたオフセット輪転印刷適性を示したものの、PPSラフネスはいずれも１．６μｍを大きく超え、グラビア印刷適性については劣っている。
The results of Examples 1 to 5 and Comparative Examples 1 to 5 in Table 1 indicate the following.
In Examples 1 to 5, the number of calcium carbonate blended parts is less than 55 parts by weight, the number of modified starch parts is 2 parts or more and less than 4 parts, and the calendering speed is in the range of 1400 m / min to 1600 m / min. The PPS roughness of these samples is less than 1.6 μm, and both the gravure printing suitability and the offset rotary printing suitability are △ evaluation or more, and the coated paper for gravure / offset rotary printing is excellent in both suitability. .
Comparative Example 1 has 4 parts of modified starch, and Comparative Examples 1 and 2 both have a calcium carbonate content of 55 parts by weight or more. All of these PPS roughnesses are slightly over 1.6 μm, and the gravure printability is slightly inferior.
Comparative Example 3 is a typical coated paper for an offset rotary press and exhibits excellent offset rotary printing aptitude, but the PPS roughness greatly exceeds 1.6 μm, and the gravure printing aptitude is poor.
比較例４は変性澱粉無配合で、プラスチックピグメントを４部配合したことにより、極めて高い平滑性を有し、優れたグラビア印刷適性を有するが、オフセット印刷用としては表面強度、インキパイリングとも劣っている。 Comparative Example 4 contains no modified starch and has 4 parts of plastic pigment, so it has extremely high smoothness and excellent gravure printability, but is inferior in surface strength and ink piling for offset printing. Yes.
比較例５は、グラビア印刷適性、オフセット輪転印刷適性ともに優れるものの、実施例と比較して塗工速度、カレンダ処理速度ともに遅く、生産性が劣る。 Comparative Example 5 is excellent in both gravure printing aptitude and offset rotary printing aptitude, but compared with the examples, the coating speed and the calendering speed are both low and the productivity is inferior.
Claims (4)
顔料１００重量部中、炭酸カルシウムが５５重量部未満であり、変性澱粉の量が２重量部以上４重量部未満である塗工液を原紙上にブレード塗工し、
４ニップ以上の高温ソフトニップカレンダを使用して、処理速度が１３００ｍ／ｍｉｎ以上、金属ロールの表面温度が１８０℃以上２５０℃未満、最大ニップ圧が２５０ｋＮ／ｍ以上４００ｋＮ／ｍ未満という条件で平滑化された、上記塗工紙。 Coating layer mainly composed of Pigments and adhesive is provided on the base paper, PPS roughness a rotogravure offset rotary combined coated printing paper is 1.1～1.6Myuemu,
In the pigment 100 parts by weight of calcium carbonate is less than 55 parts by weight, the amount of modified starch is a blade coating a Der Ru coating solution less than 2 parts by weight 4 parts by weight on the base paper,
Using a high-temperature soft nip calender with 4 nips or more , smoothing is performed under the conditions that the processing speed is 1300 m / min or more, the surface temperature of the metal roll is 180 ° C. or more and less than 250 ° C. , and the maximum nip pressure is 250 kN / m or more and less than 400 kN / m. The above coated paper.
顔料１００重量部中、炭酸カルシウムが５５重量部未満であり、変性澱粉の含量が２重量部以上４重量部未満である塗工液を原紙上にブレード塗工することと、Blade coating a coating solution containing less than 55 parts by weight of calcium carbonate and 100 parts by weight of pigment and having a modified starch content of 2 parts by weight or more and less than 4 parts by weight;
４ニップ以上の高温ソフトニップカレンダを使用して、処理速度が１３００ｍ／ｍｉｎ以上、金属ロールの表面温度が１８０℃以上２５０℃未満、最大ニップ圧が２５０ｋＮ／ｍ以上４００ｋＮ／ｍ未満という条件で平滑化することと、Using a high-temperature soft nip calender with 4 nips or more, smoothing is performed under the conditions that the processing speed is 1300 m / min or more, the surface temperature of the metal roll is 180 ° C. or more and less than 250 ° C., and the maximum nip pressure is 250 kN / m or more and less than 400 kN / m. And
を含む、上記方法。Including the above method.
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