JPH0517877B2 - - Google Patents
Info
- Publication number
- JPH0517877B2 JPH0517877B2 JP60268080A JP26808085A JPH0517877B2 JP H0517877 B2 JPH0517877 B2 JP H0517877B2 JP 60268080 A JP60268080 A JP 60268080A JP 26808085 A JP26808085 A JP 26808085A JP H0517877 B2 JPH0517877 B2 JP H0517877B2
- Authority
- JP
- Japan
- Prior art keywords
- acid
- water
- dampening solution
- dampening
- lithographic printing
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development
Landscapes
- Printing Plates And Materials Therefor (AREA)
Description
(イ) 産業上の利用分野
本発明は、アルミニウム薄板を支持体とする平
版印刷版を用いて、平版印刷する際に使用する湿
し水用組成物に関するものであり、水膜保持性の
良好な湿し水を提供しうる湿し水用組成物に関す
るものである。
(ロ) 従来の技術及び発明が解決しようとする問題
点
平版印刷において、印刷物の汚れを防止するた
めの平版印刷版の非画像部に湿し水を付着させる
ことが行われている。この湿し水は、非画像部に
少量で正確に水膜を形成しうる性質が要求され
る。これは、多量に湿し水を非画像部に供給する
と、画像部に水が浸入して印刷ミスを起こす恐れ
があるからである。
従来より、湿し水の供給量が少なくなるように
湿し水中にポリビニルアルコール等の水溶性高分
子を配合し、湿し水の蒸発を抑制することを行わ
れている。
しかしこの方法は、湿し水の供給は少量となる
ものの、非画像部に正確に水膜を形成するという
性質を十分に発揮するものではなかつた。つまり
印刷中に水膜が乱れ、印刷物の汚れを惹起するこ
とがあつた。
そこで本発明は、非画像部に少量で正確に水膜
を形成、保持しうる湿し水用組成物を提供するこ
とを目的としている。
(ハ) 問題点を解決するための手段及び作用
即ち、本発明は、アルミニウム薄板を支持する
平版印刷版を用いて、平版印刷する際に使用する
湿し水用組成物において、該湿し水用組成物に
は、フイチン酸と、アルミニウム金属をキレート
化する、ブタン−１，２，３，４−テトラカルボ
ン酸、エチレンジアミンテトラ酢酸、プロピレン
ジアミンテトラ酢酸、ペンタメチンレジアミンテ
トラ酢酸、シクロペンタン−１，２−ジアミンテ
トラ酢酸、シクロヘキサン−１，４−ジアミンテ
トラ酢酸、２−ヒドロキシトリメチレンジアミン
テトラ酢酸よりなる群から選ばれたキレート剤
と、水溶性高分子とが含有されていることを特徴
とする平版印刷に用いる湿し水用組成物に係るも
のであり、この湿し水用組成物は顆粒状で又は水
溶液状で取り扱われる。
本発明に用いるフイチン酸はイノシツトヘキサ
リン酸とも呼ばれ、粘稠な液体で水に易溶で且つ
水との親和力の大きい化合物である。
本発明に用いるアルミニウム金属をキレート化
するキレート剤としては、ブタン−１，２，３，
４−テトラカルボン酸、エチレンジアミンテトラ
酢酸、プロピレンジアミンテトラ酢酸、ペンタメ
チレンジアミンテトラ酢酸、シクロペンタン−
１，２−ジアミンテトラ酢酸、シクロヘキサン−
１，４−ジアミンテトラ酢酸、２−ヒドロキシト
リメチレンジアミンテトラ酢酸が単独で又は混合
して使用される。この中でも特にエチレンジアミ
ンテトラ酢酸（以下、「EDTA」という。）が、
キレート効果に優れ且つ安価で入手が容易である
ことから最も好ましい。このキレート剤は平版印
刷版の支持体であるアルミニウム薄板から脱落す
るアルミニウム金属を捕捉する作用をするもので
ある。
本発明に用いる水溶性高分子としては、ポリビ
ニルアルコール（以下、「PVA」という。）、ポリ
アクリル酸、アルギン酸ソーダ、カルボキシメチ
ルセルロース等が挙げられる。この水溶性高分子
は水の蒸発を抑制する作用をするものである。
本発明に係る湿し水用組成物は、フイチン酸１
重量部に対してキレート剤0.3〜0.7重量部程度、
水溶性高分子１〜２重量部程度が配合される。キ
レート剤が0.3重量部未満となると、平版印刷版
の支持体であるアルミニウム薄板から脱落するア
ルミニウム金属を捕捉する能力が低下する傾向と
なる。又、0.7重量部を超えてキレート剤を配合
してもアルミニウム金属を捕捉する能力がさほど
向上しない傾向となる。水溶性高分子が１重量部
未満となると水の蒸発を防ぐ作用が低下する傾向
となり、又２重量部を超えて配合すると湿し水の
粘性が大きくなる傾向となる。
水50〜100重量部程度に本発明に係る湿し水用
組成物１重量部を溶解させて湿し水とすることが
できる。本発明に係る湿し水用組成物は顆粒状で
取り扱われ使用の際、水に溶解させて湿し水とし
てもよいし、少量の水に溶解させた液状の湿し水
用組成物（原液）を使用の際、更に希釈して湿し
水としてもよい。
(ニ) 実施例
下記第１表の配合割合にて湿し水を作成した。
又、比較のためフイチン酸とキレート剤を配合し
ていない湿し水も作成した。
(a) Industrial application field The present invention relates to a dampening solution composition used in lithographic printing using a lithographic printing plate having an aluminum thin plate as a support, and which has good water film retention. The present invention relates to a dampening solution composition capable of providing a dampening solution with a high quality. (b) Prior art and problems to be solved by the invention In planographic printing, dampening water is applied to the non-image areas of the planographic printing plate in order to prevent the printed matter from staining. This dampening solution is required to have the property of being able to accurately form a water film in a small amount on non-image areas. This is because if a large amount of dampening water is supplied to the non-image area, water may enter the image area and cause printing errors. Conventionally, water-soluble polymers such as polyvinyl alcohol are added to dampening water so that the amount of dampening water supplied is reduced, thereby suppressing the evaporation of the dampening water. However, although this method supplies a small amount of dampening water, it does not fully exhibit its ability to accurately form a water film on non-image areas. In other words, the water film was disturbed during printing, causing stains on the printed matter. Therefore, an object of the present invention is to provide a dampening solution composition that can accurately form and maintain a water film in a small amount on a non-image area. (c) Means and effects for solving the problems That is, the present invention provides a dampening solution composition for use in lithographic printing using a lithographic printing plate supporting a thin aluminum plate. The composition includes phytic acid and chelating aluminum metal, butane-1,2,3,4-tetracarboxylic acid, ethylenediaminetetraacetic acid, propylenediaminetetraacetic acid, pentamethinediaminetetraacetic acid, cyclopentane-tetraacetic acid, It is characterized by containing a chelating agent selected from the group consisting of 1,2-diaminetetraacetic acid, cyclohexane-1,4-diaminetetraacetic acid, and 2-hydroxytrimethylenediaminetetraacetic acid, and a water-soluble polymer. This invention relates to a dampening solution composition used in lithographic printing, and this dampening solution composition is handled in the form of granules or an aqueous solution. Phytic acid used in the present invention is also called inositohexalic acid, and is a compound that is a viscous liquid, easily soluble in water, and has a large affinity for water. As the chelating agent for chelating aluminum metal used in the present invention, butane-1,2,3,
4-tetracarboxylic acid, ethylenediaminetetraacetic acid, propylenediaminetetraacetic acid, pentamethylenediaminetetraacetic acid, cyclopentane-
1,2-diaminetetraacetic acid, cyclohexane-
1,4-diaminetetraacetic acid and 2-hydroxytrimethylenediaminetetraacetic acid are used alone or in combination. Among these, ethylenediaminetetraacetic acid (hereinafter referred to as "EDTA") is particularly
It is most preferred because it has an excellent chelating effect, is inexpensive, and is easily available. This chelating agent functions to capture aluminum metal that falls off from the thin aluminum plate that is the support of the lithographic printing plate. Examples of water-soluble polymers used in the present invention include polyvinyl alcohol (hereinafter referred to as "PVA"), polyacrylic acid, sodium alginate, carboxymethyl cellulose, and the like. This water-soluble polymer functions to suppress water evaporation. The dampening solution composition according to the present invention comprises phytic acid 1
Approximately 0.3 to 0.7 parts by weight of chelating agent to parts by weight,
About 1 to 2 parts by weight of water-soluble polymer is blended. When the amount of the chelating agent is less than 0.3 parts by weight, the ability to capture aluminum metal falling off from the thin aluminum plate that is the support of the lithographic printing plate tends to decrease. Furthermore, even if the chelating agent is added in an amount exceeding 0.7 parts by weight, the ability to capture aluminum metal tends not to improve much. If the amount of the water-soluble polymer is less than 1 part by weight, the effect of preventing water evaporation will tend to decrease, and if it exceeds 2 parts by weight, the viscosity of the dampening solution will tend to increase. A dampening solution can be prepared by dissolving 1 part by weight of the dampening solution composition according to the present invention in about 50 to 100 parts by weight of water. The dampening solution composition according to the present invention is handled in the form of granules, and when used, it may be dissolved in water to be used as a dampening solution, or it may be used as a liquid dampening solution dissolved in a small amount of water (undiluted solution). ) may be further diluted and used as dampening water. (d) Example A dampening solution was prepared using the blending ratios shown in Table 1 below.
For comparison, a dampening solution containing no phytic acid or chelating agent was also prepared.
【表】
これらの湿し水をアルミニウム薄板を支持体と
する平版印刷版に供給し、非画像部に水膜を形成
した。その後、湿し水の供給を断ち、同一条件で
印刷インキを供給しながら校正刷りを行つた。こ
の結果、実施例１〜３は11枚の校正刷りを得るこ
とができ、実施例４では８枚、実施例５では７枚
の校正刷りを得ることができた。これに対し、比
較列では５枚の校正刷りを得ることができ、６枚
目からは印刷汚れが顕著となつた。このことから
明らかなように、実施例に係る湿し水を用いたと
きは、従来の湿し水（比較例）を用いたときに比
べ、約1.5〜２倍程度非画像部における水膜の保
持性に優れていることが判る。
(ホ) 発明の効果
本発明に係る湿し水用組成物を用いて得られる
湿し水は、水との親和力が大きいフイチン酸が配
合されているので、水膜の保持性が良好である。
そしてキレート剤が平版印刷版の支持体であるア
ルミニウム薄板から脱落してくるアルミニウム金
運を捕捉し、水溶性高分子が湿し水の蒸発を抑制
する。これらの相乗作用の結果、非画像部に形成
された水膜は印刷中良好に保持されて且つ乱れる
ことがないので、印刷物を汚すことが少なくな
る。さらに、従来の湿し水に比べ、同一量でより
多量の印刷物を印刷することができるので、印刷
中における湿し水の供給量を少なくすることがで
きるという効果も奏する。[Table] These dampening waters were supplied to a lithographic printing plate having a thin aluminum plate as a support to form a water film on the non-image area. Thereafter, the supply of dampening water was cut off, and proof printing was performed under the same conditions while supplying printing ink. As a result, 11 proof sheets were obtained in Examples 1 to 3, 8 proof sheets were obtained in Example 4, and 7 proof sheets were obtained in Example 5. On the other hand, in the comparative row, 5 proof sheets were obtained, and the printing stains became noticeable from the 6th sheet onwards. As is clear from this, when the dampening solution according to the example was used, the water film in the non-image area was about 1.5 to 2 times larger than when the conventional dampening solution (comparative example) was used. It can be seen that the retention property is excellent. (e) Effects of the invention The dampening solution obtained using the dampening solution composition according to the present invention has good water film retention because it contains phytic acid which has a high affinity with water. .
The chelating agent captures the aluminum particles that fall off from the thin aluminum plate that is the support for the lithographic printing plate, and the water-soluble polymer suppresses the evaporation of dampening water. As a result of these synergistic effects, the water film formed in the non-image area is better retained and undisturbed during printing, so that it is less likely to stain the print. Furthermore, since it is possible to print a larger amount of printed matter with the same amount of dampening water than with conventional dampening water, there is also the effect that the amount of dampening water supplied during printing can be reduced.
Claims (1)
を用いて、平版印刷する際に使用する湿し水用組
成物において、該湿し水用組成物には、フイチン
酸と、アルミニウム金属をキレート化する、ブタ
ン−１，２，３，４−テトラカルボン酸、エチレ
ンジアミンテトラ酢酸、プロピレンジアミンテト
ラ酢酸、ペンタメチレンジアミンテトラ酢酸、シ
クロペンタン−１，２−ジアミンテトラ酢酸、シ
クロヘキサン−１，４−ジアミンテトラ酢酸、２
−ヒドロキシトリメチレンジアミンテトラ酢酸よ
りなる群から選ばれたキレート剤と、水溶性高分
子とが含有されていることを特徴とする平版印刷
に用いる湿し水用組成物。 ２ 水溶液形態である特許請求の範囲第１項記載
の平版印刷に用いる湿し水用組成物。[Scope of Claims] 1. A dampening solution composition used in lithographic printing using a lithographic printing plate having an aluminum thin plate as a support, the dampening solution composition containing phytic acid; Chelates aluminum metal, butane-1,2,3,4-tetracarboxylic acid, ethylenediaminetetraacetic acid, propylenediaminetetraacetic acid, pentamethylenediaminetetraacetic acid, cyclopentane-1,2-diaminetetraacetic acid, cyclohexane-1 , 4-diaminetetraacetic acid, 2
- A dampening solution composition for use in lithographic printing, comprising a chelating agent selected from the group consisting of hydroxytrimethylenediaminetetraacetic acid and a water-soluble polymer. 2. A dampening solution composition for use in lithographic printing according to claim 1, which is in the form of an aqueous solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26808085A JPS62127288A (en) | 1985-11-28 | 1985-11-28 | Damping water composition for use in planography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26808085A JPS62127288A (en) | 1985-11-28 | 1985-11-28 | Damping water composition for use in planography |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62127288A JPS62127288A (en) | 1987-06-09 |
| JPH0517877B2 true JPH0517877B2 (en) | 1993-03-10 |
Family
ID=17453607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26808085A Granted JPS62127288A (en) | 1985-11-28 | 1985-11-28 | Damping water composition for use in planography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62127288A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5565290A (en) * | 1991-07-30 | 1996-10-15 | Fuji Photo Film Co., Ltd. | Desensitizing solution for offset printing |
| JP5343575B2 (en) * | 2009-01-20 | 2013-11-13 | 凸版印刷株式会社 | Dampening water quantitative dilution device for offset printing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS562189A (en) * | 1979-06-21 | 1981-01-10 | Mitsui Toatsu Chem Inc | Treating liquid for use in lithography |
| JPS56117691A (en) * | 1980-02-21 | 1981-09-16 | Ricoh Co Ltd | Insensitive aliphatization of flat printing plate |
| JPS57199694A (en) * | 1981-06-03 | 1982-12-07 | Oji Paper Co Ltd | Treating liquid for planographic printing plate |
-
1985
- 1985-11-28 JP JP26808085A patent/JPS62127288A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62127288A (en) | 1987-06-09 |
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