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Development activating solution and use of it for preparing offset plate with high image contrast

A technology of activating solution and developing accelerator, which is applied in the field of printing and plate making, can solve the problems of poor dot quality, low printing durability, and low image contrast, and achieve the effects of high printing durability, improved image contrast, and strong dots

Inactive Publication Date: 2004-06-30
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the CTP offset printing plate made of upward diffusion plate, there are disadvantages of low image contrast, poor dot quality and low printing durability. How to improve image contrast and printing durability is a problem to be solved in the silver salt diffusion transfer method. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) preparation of prior art developing activation solution

[0030] In a container, add 700ml of water, then add 60g of anhydrous sodium sulfite, 20g of sodium hydroxide, 10g of sodium thiosulfate, 5g of uracil and 3ml of saponin aqueous solution (concentration is 10 grams per liter), stir and make them Dissolve in water, and further add water to the container to obtain 1 liter of transparent aqueous solution, which is the development activation solution of this embodiment.

[0031] (2) Preparation and printing experiment of CTP offset printing plate

[0032] Corona discharge treated plastic coated paper base weight 120 g / m 2 As a support, a carbon black anti-halation layer of about 3 μm is coated on the support, and the carbon black anti-halation coating solution used contains 3wt% carbon black, 10wt% of 1-10 μm SiO 2 , 4.5wt% gelatin, 15wt% developer, and all the other are water, wherein the developer is a mixture of hydroquinone and phenidone with a weight ratio o...

Embodiment 2

[0051] (1) Preparation of developing activation solution

[0052] In a container, add 700ml of water, then add 60g of anhydrous sodium sulfite, 20g of sodium hydroxide, 10g of sodium thiosulfate, 5g of uracil, 3ml of saponin aqueous solution (concentration is 10 g / L) and 1.0 g of 6- Nitrobenzimidazole was stirred and dissolved in water, and water was further added to the container to obtain 1 liter of transparent aqueous solution, which was the development activation solution of the present embodiment.

[0053] (2) Preparation and printing experiment of CTP offset printing plate

[0054] According to the method and steps described in Example 1, a CTP offset printing plate was prepared and a printing experiment was carried out using the developer activation solution of this example. The image contrast performance and printing durability of the CTP offset printing plate are shown in Table 3.

Embodiment 3

[0056] The development activation solution was prepared according to the method shown in Example 2, except that the development inhibitor was 1.0 g of 6-nitrobenzimidazole and 1.2 g of thiosalicylic acid.

[0057] According to the method and steps described in Example 2, a CTP offset printing plate was prepared and a printing experiment was carried out using the developing activation solution of this example. The image contrast performance and printing durability of the CTP offset printing plate are shown in Table 3.

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PUM

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Abstract

The invention belongs to printing plate-making technology field, especially refers to a kind of projecting activation liquid in sliver salt diffusion abevacuation plate-making system, and the liquid's application in producing high image contrast CTP offset printing plate-making. The ingredients and contents of the liquid are: 20-120g / l protectant; 5-60g / l project improving agent; 2-40 g / l silver complexing agent; 0.1-10g / l project restraining agent; 0.01-10g / l surface activation agent; the residue is water; the restraining agent is one of or the compound of 6-nitrobenzimidazole, mercapto benzene thiazole, mercapto oxdiazole, thiosalicylic acid.

Description

technical field [0001] The invention belongs to the technical field of printing and plate making, and in particular relates to a developing and activating solution in a silver salt diffusion transfer plate making system, and the application of the developing and activating solution in preparing high image contrast CTP offset printing plates. Background technique [0002] Silver salt diffusion transfer reversal principle (Diffusion Transfer Reversal, referred to as DTR principle), in "Photographic Silver Halide Diffusion Processes", edited by A. Rott and E. Weyde ("Photographic Silver Halide Diffusion Processes", by Andr Rott and Edith Weyde , The Focal Press, London and New York, 1972) has been described in a book. [0003] There are two forms of DTR system imaging: double-chip and single-chip. Two-film consists of a positive and negative film and a processing agent. Under the action of the imaging and fixing processing agent, the image formed by the...

Claims

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Application Information

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IPC IPC(8): G03C8/06G03F7/07
Inventor 陈萍盛丽琴郑德水
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI