JP3743130B2

JP3743130B2 - Water repellent printing paper

Info

Publication number: JP3743130B2
Application number: JP21058597A
Authority: JP
Inventors: 佐太幸加賀; 秀男畠山
Original assignee: Oji Holdings Corp; Oji Paper Co Ltd
Current assignee: New Oji Paper Co Ltd; Oji Holdings Corp
Priority date: 1996-10-14
Filing date: 1997-08-05
Publication date: 2006-02-08
Anticipated expiration: 2017-08-05
Also published as: JPH10183495A

Description

【０００１】
【発明の属する技術分野】
本発明は、撥水性に優れ、同時に通常の印刷作業性を有する撥水性印刷用紙に関するものである。
【０００２】
【従来の技術】
従来、紙に撥水性を付与するためには、ワックス系エマルジョン、有機珪素誘導体、オレフィン系樹脂等を、サイズプレス等の設備で含浸又は塗工している。
【０００３】
これら撥水紙は、印刷作業性を除く印刷適性は問題ないが、紙が滑り易くなる特徴があるため紙加工上種々のトラブルが発生し、特に印刷を行う場合、山崩れ、給紙不良、紙揃え不良等の問題のため印刷用としては、巾広い用途には使用されていなかった。
【０００４】
但し、前述した撥水剤の中でオレフィン系樹脂は、比較的滑り難い性質があるが、通常の印刷用紙のように製造時の含有水分が５〜７重量％では、ＪＩＳＰ８１３７の測定条件による撥水度Ｒ８以上を得るには撥水剤を多量に使用しなければならず、その結果紙が滑り易くなり印刷用紙として巾広い用途には使用されていなかった。
【０００５】
【発明が解決しようとする課題】
本発明は、雨天の屋外での使用に障害のない撥水効果があり、同時に、滑り難くて、印刷作業性に優れた印刷用紙を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明者らは、撥水剤の内、比較的滑り難いマレイン化石油樹脂アルカリ塩および流動パラフィンを主成分とする撥水剤に着目し、紙の乾燥条件を詳細に調査研究した結果、製造時の含有水分を制御することにより、少量の撥水剤で高度の撥水性を示し、同時に通常の印刷作業が可能な滑り性を有する印刷用紙が得られることを見出し、本発明を完成するに至った。
【０００７】
本発明は、パルプ繊維を主成分とする支持体に、マレイン化石油樹脂アルカリ塩および流動パラフィンを主成分とする撥水剤を含浸または塗工後、乾燥後の含有水分が２．５〜３．５重量％となるように乾燥し、ＪＩＳＰ８１３７に基づく撥水度がＲ８〜Ｒ１０で、かつＪＩＳＰ８１４７に基づく静摩擦係数が０．２７〜０．５５であることを特徴とする撥水性印刷用紙である。
【０００８】
【発明の実施の形態】
本発明は、印刷用紙の製造過程において、マレイン化石油樹脂アルカリ塩および流動パラフィンを含有する撥水剤を、公知の表面サイズ剤と共にサイズプレスで紙に含浸あるいは塗布し、同時に乾燥条件を強化して製造直後の含有水分を低く押えることにより、撥水性と共に滑り難さ（通常の印刷が可能な静摩擦係数）を兼ね備えた撥水性印刷用紙である。本発明の撥水性印刷用紙の撥水度は、Ｒ８以上であり、Ｒ８未満では雨天の屋外での使用を想定した用途には撥水性が不十分である。
【０００９】
パルプ繊維を主成分とする支持体とは、一般上質紙に使用される原材料、抄紙機を使用して得られるサイズプレス未塗工の紙である。即ち、原紙パルプが針葉樹、広葉樹の晒、未晒のいずれでも良く、填料としてタルク、炭酸カルシウム等の添加の有無や、その他紙力増強剤、着色染料、内添サイズ剤等を含んでも含まなくてもよい。通常米坪は３５〜３００ｇ／ｍ²程度である。
【００１０】
本発明で用いるマレイン化石油樹脂アルカリ塩および流動パラフィンを主成分とする撥水剤は、マレイン化石油樹脂カリウムもしくはナトリウム塩を７０〜９０重量％、流動パラフィンを１０〜３０重量％を混合、溶融もしくは有機溶剤で溶解し、例えばノニオン性乳化剤であるポリオキシエチレンステアクリルエーテルを１〜５重量％、保護コロイド剤としてトール油脂肪酸を５〜１５重量％、いずれも全固形分中に占めるように配合し水に乳化分散したものである。
【００１１】
本発明の撥水性印刷用紙の撥水剤の含浸・塗布量は、固形分で０．１〜１．０ｇ／ｍ²（片面）の範囲で適量に調整して塗布する。塗布量０．１ｇ／ｍ²未満では撥水性が不十分であり、１．０ｇ／ｍ²を越えると静摩擦係数が小さくなり印刷作業性が悪化する。静摩擦係数は０．２７〜０．５５であるが、０．２７未満では紙が滑り易く印刷機の供紙山がくずれる等印刷作業性の点で問題があり、逆に０．５５を越える値は撥水剤を塗布するため達成が難しいと共に、数枚の印刷用紙が同時に搬送されるトラブルが発生しやすく好ましくない。
【００１２】
また本発明では、静摩擦係数を低下させないため低塗布量とし、同時に高い撥水性を得るため、撥水性印刷用紙の含有水分を、乾燥後（製造直後）に２．５〜３．５重量％となるようにするが、３．５重量％を越えると紙面の撥水度を高くすることが難しくなり、逆に２．５重量％未満はドライヤーの負荷が大きくなりすぎて設備費用、エネルギー費用の点で問題となる。
【００１３】
撥水性印刷用紙は乾燥後にオンマシンカレンダー、スーパーカレンダー等で平滑化処理をするのが好ましい。表面のベック平滑度は３５〜１００秒の範囲とするのが良く、３５秒未満では印刷用紙として巾広い用途で使用することが難しく、１００秒を越える値は印刷適性としては不必要に大きな値であると共に、カレンダーの負荷が大きくなるので好ましくない。
【００１４】
尚、本発明の撥水性印刷用紙の乾燥後の含有水分とは、抄紙機のリールにおける水分を指し、該撥水性印刷用紙の試験片の全重量を分母とし、含有水分の重量を分子として求めた数値である。測定はＪＩＳＰ８１２７に準ずる。
【００１５】
また、本発明の撥水度、ベック平滑度、静摩擦係数、の数値は紙の試験片をサンプリング後、ＪＩＳＰ８１１１に準ずる恒温恒湿の部屋に放置し定常状態に達した後測定して得た数値であり、測定時の紙水分は５．５％である。
【００１６】
【実施例】
以下に、本発明を実施例を挙げて説明するが、本発明はこれらの実施例により、限定されるものではない。なお、％、部は特に断りのない限り重量％、重量部を示す。
【００１７】
（比較例）
１００％広葉樹材の晒クラフトパルプに、下記薬品を下記割合で配合して抄紙原料とし、公知の長網多筒式抄紙機を使用して上質紙を抄紙した。更に下記表面サイズ剤に下記の撥水剤を配合してサイズプレスにより固形分（発水剤のみの固形分）でそれぞれ０．８、１．０ｇ／ｍ²（片面換算）塗布し、製造直後の含有水分を３．０、５．０％として、坪量１００ｇ／ｍ²、オンマシンカレンダー処理しベック平滑度４０秒（目標値）の紙を得た。この紙の、撥水度と静摩擦係数、平滑度、印刷作業性は表１に示す通りであった。
【００１８】
＜抄紙原料の処方＞
ＬＢＫＰ１００部
カイメン（湿潤紙力増強剤、日本ＰＭＣ製）０．４部
ポリストロン（湿潤紙力増強剤、荒川化学製）０．３〜０．４部
ＳＰＳ（サイズ剤、荒川化学製）０．２６〜０．３部
合成バンド（凝集剤）１．５部
※配合割合は、原料パルプを１００部とした有効成分重量部である。
【００１９】
＜表面サイズ剤＞
ＰＶＡ（クラレ化学製）４９％
ポリマロン（荒川化学製）４％
撥水剤（下記▲１▼〜▲３▼のいずれか）４７％
※上記薬品を水で希釈後、上記固形分重量割合で混合する。
【００２０】
＜撥水剤＞
▲１▼ ワックス系エマルジョン：第一工業製薬製ラストルＳＢ
▲２▼ 有機珪素誘導体：東芝シリコーン製ＴＳＷ８３１
▲３▼ マレイン化石油樹脂カリウム塩８４％、流動パラフィン１６％を含有する撥水剤
【００２１】
但し、印刷作業性に関しては、通常のオフセット４色機を使用し、下記基準により評価した。
○ 特に問題なし。
△ 印刷機に印刷用紙の包装を開封しセットする際、印刷用紙の包装単位毎の境界（連間）に若干の滑りがあるが、印刷可能である。
× 印刷機に印刷用紙の包装を開封しセットする際、印刷用紙の包装単位毎の境界（連間）の滑りが大きく、セット姿が乱れ印刷不可能である。
【００２２】
【表１】

【００２３】
表１より、製造時の含有水分５．０％では撥水度Ｒ８以上を得るには塗布量として０．８ｇ／ｍ²が必要であり、その場合の静摩擦係数は０．１５〜０．２６と小さく、印刷時の作業性が悪くなった。撥水剤の内、本発明の撥水剤は比較的静摩擦係数が高く、印刷作業性の悪化は少なかった。
【００２４】
（実施例）
公知の長網多筒式抄紙機を使用し、比較例と同様の処方により抄紙原料を配合して抄紙し、撥水剤▲３▼を用いて比較例と同様の処方で表面サイズ剤を調合して、サイズプレスで撥水剤のみの固形分として０．３〜１．０ｇ／ｍ²（片面換算）塗布し、製造直後の含有水分を３．０〜３．５％として、坪量１００ｇ／ｍ²、ベック平滑度４０秒（目標値）の紙を得た。この紙の撥水度と静摩擦係数、平滑度、印刷作業性を評価した結果を表２に示す。
【００２５】
【表２】

【００２６】
表１、表２より明らかなように、製造時の含有水分を下げることにより、撥水剤の同一塗布量で撥水度が上昇した。すなわち、製造時の含有水分を４．０％以上とした場合では撥水度Ｒ８以上を得るには撥水剤の塗布量が０．８ｇ／ｍ²以上を必要とするため静摩擦係数が小さくなり印刷作業性が悪化した。一方、製造時の含有水分３．５％以下では撥水剤の塗布量が０．５ｇ／ｍ²以下でも撥水度はＲ８以上であり、かつ静摩擦係数は０．３２〜０．４５で印刷作業性も良好であった。
【００２７】
【発明の効果】
本発明の撥水性印刷用紙は紙面の静摩擦係数が大きいため、通常の印刷用紙に比べ遜色ない印刷作業性を持ち広範囲な印刷が可能となり、また優れた撥水性により屋外で使用される地図用紙・野帳用紙・ゴルフスコアカード・ポスター・ラベル等の広い用途に使用されることができるようになった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water-repellent printing paper having excellent water repellency and simultaneously having normal printing workability.
[0002]
[Prior art]
Conventionally, in order to impart water repellency to paper, a wax-based emulsion, an organic silicon derivative, an olefin-based resin, or the like is impregnated or coated with equipment such as a size press.
[0003]
These water-repellent papers have no problem in printability except for printing workability, but because of the characteristic that the paper is slippery, various troubles occur in paper processing, especially when printing, landslides, poor paper feeding, paper Due to problems such as misalignment, it has not been used for wide applications as printing.
[0004]
However, among the water repellents described above, the olefin resin is relatively non-slipable. However, when the moisture content at the time of production is 5 to 7% by weight as in normal printing paper, it depends on the measurement conditions of JIS P8137. In order to obtain a water repellency of R8 or higher, a large amount of water repellent must be used. As a result, the paper becomes slippery and has not been used for a wide range of printing paper.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a printing paper that has a water repellent effect that does not hinder outdoor use in rainy weather, and that is not slippery and has excellent printing workability.
[0006]
[Means for Solving the Problems]
As a result of detailed investigation and research on paper drying conditions, the inventors of the present invention focused on a water repellent agent that is relatively hard to slip, including a maleated petroleum resin alkali salt and liquid paraffin as main components. In order to complete the present invention, it was found that by controlling the moisture content at the time, it is possible to obtain a printing paper that exhibits a high degree of water repellency with a small amount of water repellent and at the same time has slipperiness that allows normal printing operations. It came.
[0007]
The present invention impregnates or coats a support mainly composed of pulp fibers with a water repellent composed mainly of maleated petroleum resin alkali salt and liquid paraffin, and the water content after drying is 2.5-3. Water-repellent printing paper which is dried to 5 wt%, has a water repellency based on JIS P8137 of R8 to R10, and a static friction coefficient based on JIS P8147 of 0.27 to 0.55 It is.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention impregnates or applies a water repellent containing a maleated petroleum resin alkali salt and liquid paraffin to a paper with a known surface sizing agent in a size press in the manufacturing process of printing paper, and at the same time enhances drying conditions. Thus, the water-repellent printing paper has both water repellency and non-slip (static friction coefficient capable of normal printing) by keeping the moisture content just after production low. The water repellency of the water-repellent printing paper of the present invention is R8 or more, and if it is less than R8, the water repellency is insufficient for applications assuming outdoor use in rainy weather.
[0009]
The support mainly composed of pulp fibers is a raw material generally used for high-quality paper, and paper that has not been subjected to size press obtained by using a paper machine. That is, the raw paper pulp may be either softwood, hardwood bleached or unbleached, and it does not contain talc, calcium carbonate, etc. as a filler, or other paper strength enhancers, coloring dyes, internal sizing agents, etc. May be. Usually, the rice tsubo is about 35 to 300 g / m ² .
[0010]
The water repellent mainly composed of maleated petroleum resin alkali salt and liquid paraffin used in the present invention is mixed and melted with 70 to 90% by weight of maleated petroleum resin potassium or sodium salt and 10 to 30% by weight of liquid paraffin. Or it dissolves in an organic solvent, for example, polyoxyethylene steacryl ether, which is a nonionic emulsifier, is 1 to 5% by weight, and tall oil fatty acid is 5 to 15% by weight as a protective colloid agent. Blended and emulsified and dispersed in water.
[0011]
The water repellent printing paper of the present invention is applied with the water repellent impregnated and applied in an amount of 0.1 to 1.0 g / m ² (single side) in solid content. If the coating amount is less than 0.1 g / m ² , the water repellency is insufficient, and if it exceeds 1.0 g / m ² , the static friction coefficient decreases and the printing workability deteriorates. The coefficient of static friction is 0.27 to 0.55, but if it is less than 0.27, there is a problem in terms of printing workability such as slipping of the paper and breakage of the printing paper, and conversely a value exceeding 0.55. Is difficult to achieve due to the application of a water repellent agent, and it is not preferred because troubles in which several printing sheets are simultaneously conveyed are likely to occur.
[0012]
Further, in the present invention, the water content of the water-repellent printing paper is 2.5 to 3.5% by weight after drying (immediately after production) in order to reduce the static friction coefficient so as to reduce the coating amount and at the same time to obtain high water repellency. However, if it exceeds 3.5% by weight, it will be difficult to increase the water repellency of the paper surface. Conversely, if it is less than 2.5% by weight, the load on the dryer will be too great and the equipment and energy costs will be reduced. This is a problem.
[0013]
The water-repellent printing paper is preferably smoothed with an on-machine calendar, a super calendar or the like after drying. The surface Beck smoothness should be in the range of 35 to 100 seconds, and if it is less than 35 seconds, it is difficult to use it for a wide range of applications as printing paper, and values exceeding 100 seconds are unnecessarily large values for printability. In addition, the load on the calendar increases, which is not preferable.
[0014]
The water content after drying of the water-repellent printing paper of the present invention refers to the water content in the reel of the paper machine, and the total weight of the test piece of the water-repellent printing paper is used as the denominator, and the weight of water content is obtained as the numerator. It is a numerical value. Measurement conforms to JIS P8127.
[0015]
The numerical values of the water repellency, Beck smoothness, and static friction coefficient of the present invention were obtained by sampling a paper test piece, leaving it in a constant temperature and humidity room according to JIS P8111, and reaching a steady state. It is a numerical value, and the paper moisture at the time of measurement is 5.5%.
[0016]
【Example】
EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In addition,% and a part show weight% and a weight part unless there is particular notice.
[0017]
(Comparative example)
The following chemicals were blended in 100% hardwood bleached kraft pulp in the following proportions to make papermaking materials, and high-quality paper was made using a known long net multi-cylinder papermaking machine. Furthermore, the following surface sizing agent is blended with the following water repellent and applied by a size press at a solid content (solid content of only the water generating agent) of 0.8 and 1.0 g / m ² (single side conversion), respectively, immediately after production. the water content as 3.0, 5.0%, a basis weight of 100 g / m ^2, to obtain on-machine calendering and Bekk smoothness of 40 seconds of paper (a target value). Table 1 shows the water repellency, static friction coefficient, smoothness, and printing workability of this paper.
[0018]
<Prescription of papermaking materials>
LBKP 100 parts sponge (wet paper strength enhancer, manufactured by Japan PMC) 0.4 parts polystron (wet paper strength enhancer, manufactured by Arakawa Chemical) 0.3-0.4 parts SPS (size agent, manufactured by Arakawa Chemical) 0 .26-0.3 part synthetic band (flocculating agent) 1.5 parts * The blending ratio is part by weight of the active ingredient based on 100 parts raw pulp.
[0019]
<Surface sizing agent>
PVA (Kuraray Chemical) 49%
Polymaron (Arakawa Chemical) 4%
Water repellent (any one of (1) to (3) below) 47%
* After diluting the above chemicals with water, mix in the above solid content weight ratio.
[0020]
<Water repellent>
(1) Wax emulsion: Daiichi Kogyo Seiyaku's Lastol SB
(2) Organosilicon derivative: TSW831 made by Toshiba Silicone
(3) Water repellent containing 84% maleated petroleum resin potassium salt and 16% liquid paraffin [0021]
However, the printing workability was evaluated according to the following criteria using a normal offset 4-color machine.
○ There is no particular problem.
Δ When opening and setting the packaging of the printing paper in the printing press, there is a slight slip at the boundary (interval) for each packaging unit of the printing paper, but printing is possible.
× When opening and setting the packaging of printing paper on a printing press, the border of the printing paper for each packaging unit (sliding) is large, the set appearance is disturbed and printing is impossible.
[0022]
[Table 1]

[0023]
From Table 1, when the moisture content during production is 5.0%, a coating amount of 0.8 g / m ² is necessary to obtain a water repellency of R8 or more. In this case, the coefficient of static friction is 0.15 to 0.26. The workability at the time of printing deteriorated. Among the water repellents, the water repellent of the present invention had a relatively high coefficient of static friction, and there was little deterioration in printing workability.
[0024]
(Example)
Using a known long-mesh multi-cylinder paper machine, papermaking materials are blended according to the same formulation as in the comparative example, and a surface sizing agent is formulated using the water repellent (3) in the same formulation as in the comparative example. Then, the solid content of only the water repellent is applied by a size press at 0.3 to 1.0 g / m ² (one side conversion), the moisture content immediately after production is 3.0 to 3.5%, and the basis weight is 100 g. / M ² , paper with Beck smoothness of 40 seconds (target value) was obtained. Table 2 shows the results of evaluating the water repellency, static friction coefficient, smoothness, and printing workability of this paper.
[0025]
[Table 2]

[0026]
As is clear from Tables 1 and 2, the water repellency increased with the same application amount of the water repellent by lowering the water content during production. That is, when the moisture content during production is 4.0% or more, the static friction coefficient is reduced because the application amount of the water repellent is 0.8 g / m ² or more in order to obtain the water repellency R8 or more. Printing workability deteriorated. On the other hand, when the water content during production is 3.5% or less, the water repellency is R8 or more and the static friction coefficient is 0.32 to 0.45 even when the coating amount of the water repellent is 0.5 g / m ² or less. Workability was also good.
[0027]
【The invention's effect】
Since the water-repellent printing paper of the present invention has a large coefficient of static friction on the paper surface, it has a printing workability comparable to that of normal printing paper and enables a wide range of printing. It can be used for a wide range of fields such as field book paper, golf score cards, posters, and labels.

Claims

A support mainly composed of pulp fiber is impregnated or coated with a water repellent composed mainly of maleated petroleum resin alkali salt and liquid paraffin, and has a water repellency of R8 to R10 based on JIS P8137, and JIS A water-repellent printing paper having a static friction coefficient based on P8147 of 0.27 to 0.55.