Double-coating positive thermosensitive CTP plate

A double-coating, positive image technology, applied to photosensitive materials used in optomechanical equipment, printing plate preparation, printing, etc., can solve problems such as poor alkali resistance, soft hardness, and low printing resistance

Active Publication Date: 2015-07-01
LUCKY HUAGUANG GRAPHICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The printing process is realized by applying the principle of water-ink balance. The support body with hydrophilic surface provides a hydrophilic surface, which is hydrophilic and ink-repelling. The photosensitive layer is exposed and developed to form an lipophilic layer, which is lipophilic and water-repelling. It has a fountain solution dampening process. In order to reduce the surface tension of the fountain solution, a certain amount of organic solvent is added to the fountain solution. At the same time, in the cleaning of the printing machine and other operations, there is an organic solvent that touches the printing plate, which affects the printing plate. The solvent-resistant type has certain requirements. Generally, the thermoplastic phenolic resin used in the photosensitive layer has the following defects: poor wear resistance, low printing resistance when used as a lithographic plate, and poor solvent resistance, especially when using UV ink. Durability is worse, etc.
In CN1891455A, CN1292508, and JP2

Method used

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  • Double-coating positive thermosensitive CTP plate
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  • Double-coating positive thermosensitive CTP plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] Resin layer formula: 10 parts by weight of N,N-dimethylformamide (DMF), 10 parts by weight of butyl acetate, 65 parts by weight of ethyl cellosolve, UV-1 resin (Lucky Huaguang Printing Technology Co., Ltd.) 10 parts by weight, 4 parts by weight of o- or p-toluenesulfonamide formaldehyde resin (Nantong Wolan Chemical Co., Ltd.), 0.5 parts by weight of tetrahydrophthalic anhydride, and 0.5 parts by weight of methyl violet.

Embodiment 2

[0133] Resin layer formula: 10 parts by weight of N,N-dimethylformamide (DMF), 10 parts by weight of butyl acetate, 65 parts by weight of ethyl cellosolve UV-1 resin (Lucky Huaguang Printing Technology Co., Ltd.) 9 Parts by weight, o- or p-toluenesulfonamide formaldehyde resin (Nantong Wolan Chemical Co., Ltd.) 5 parts by weight, tetrahydrophthalic anhydride 0.5 parts by weight, methyl violet 0.5 parts by weight.

Embodiment 3

[0135] Resin layer formula: 10 parts by weight of N,N-dimethylformamide (DMF), 10 parts by weight of butyl acetate, 65 parts by weight of ethyl cellosolve, UV-1 resin (Lucky Huaguang Printing Technology Co., Ltd.) 7 parts by weight, 7 parts by weight of o- or p-toluenesulfonamide formaldehyde resin (Nantong Wolan Chemical Co., Ltd.), 0.5 parts by weight of tetrahydrophthalic anhydride, and 0.5 parts by weight of methyl violet. Example 4

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Abstract

The invention discloses a double-coating positive thermosensitive CTP plate, and particularly relates to the application of sulfamide-formaldehyde resin in a positive thermosensitive CTP plate. The double-coating positive thermosensitive CTP plate is used for solving the technical problem that an underexposure part of a printing plate precursor is poor in alkali resistance, the hardness becomes soft, and the plate developing latitude is decreased. According to the double-coating positive thermosensitive CTP plate, a support body of a hydrophilic surface is sequentially coated with a resin layer and a thermosensitive layer; the resin layer comprises film forming resin, alkali dissolution resin, coloring background dye, a development accelerant and the like; the thermosensitive layer comprises phenolic resin, an infrared absorption agent, a dissolution inhibitor/promoter, coloring background dye and the like; the added resin in the resin layer of the positive thermosensitive CTP plate is o/p-toluenesulfonamide formuladehyde resin with the structure as shown in the specification, wherein n is 2-3, and CH3 is o/p-methylphenyl. By adopting the technical scheme, the double-coating positive thermosensitive CTP plate has good latitude and pressure.

Description

technical field [0001] The invention relates to a positive thermal CTP plate material, in particular to the application of sulfonamide formaldehyde resin in the positive thermal CTP plate material. Background technique [0002] With the development of computer image processing technology, people's attention has turned to photosensitive or thermal direct plate-making systems that directly image digital imaging information through laser beams or thermal heads. The use of large-scale semiconductor lasers or YGA lasers has the following advantages over traditional photocuring plate-making methods: high-resolution images can be obtained through short-time exposure; time-saving effects; thermal direct plate-making plates used in the system can be operated under sunlight, reaching Labor saving effect. [0003] With the continuous development of positive-working thermal lithographic printing plate precursors, patent WO / 9739894 introduces a positive-working thermal lithographic prin...

Claims

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Application Information

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IPC IPC(8): B41C1/10G03F7/004
Inventor 冯磊孔祥丽张涛栗更新王群英牛红雨薛新琴
Owner LUCKY HUAGUANG GRAPHICS
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