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Process for producing lithographic printing plate

A technology for lithographic printing plates and original plates, which is used in the field of preparing lithographic printing plates, can solve the problems of deterioration of printing durability, large amount of waste liquid, and high operating costs, and achieves excellent printing durability, good printing durability, and prevention of developing floating. slag effect

Active Publication Date: 2011-08-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the treatment solution does not contain an alkali component, it is necessary to make the binder polymer in the photosensitive layer hydrophilic to enable development, resulting in a problem of severe deterioration in printing durability
[0009] Since the developing process known hitherto includes three steps: developing with a strong alkaline aqueous solution, washing the alkaline reagent with a water bath, and then treating with a gum solution mainly containing a hydrophilic resin, the automatic developing machine has a large size, and the waste liquid The volume is large and the operating cost is high
[0010] On the other hand, in the case of development using, for example, a low-alkaline developer having a pH of 9 to 11, problems such as generation of development scum, poor development performance, and printing durability of the obtained lithographic printing plate need to be solved. insufficient

Method used

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  • Process for producing lithographic printing plate
  • Process for producing lithographic printing plate
  • Process for producing lithographic printing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 74

[0585] Examples 1 to 74, Comparative Examples 1 to 4 and Reference Example 1

[0586] (1) Exposure, development and printing

[0587] Each of the carrier, photosensitive Image-wise exposure of the lithographic printing plate master of the layer and protective layer. Using an FM screen (TAFFETA 20, produced by FUJIFILM Corp.) at 0.05 mJ / cm 2 The surface exposure of the plate was image drawn at a resolution of 2,438 dpi and a dot of 50%.

[0588] The exposed lithographic printing plate precursor was preheated at 100° C. for 30 seconds, and then as shown in Tables 9 to 11 so that the immersion time in the developer (development time) was 20 seconds, using the Each of the developers 1 to 50 of the compositions and pHs shown in to 8 were subjected to a development process in an automatic development processor having a configuration as shown in 1 .

[0589]

[0590]

[0591]

[0592]

[0593]

[0594]

[0595] The pH of each developer is shown below.

[0596...

Embodiment 75

[0629] In the purple semiconductor laser plate setter Vx9600 (manufactured by FUJIFILM Electronic Imaging Ltd.), in which the InGaN semiconductor laser (emission: 405nm±10nm / output: 30mW) had been replaced by a semiconductor laser having an output power of 100mW, the Lithographic printing original plate at 0.25mJ / cm 2 Image exposure is carried out according to the exposure amount of the plate surface. Use developer 1 in a figure 1 The exposed lithographic printing plate precursor was developed without preheating in an automatic development processor of the configuration shown in . Except as described above, developability, print image forming performance, handling performance and printing durability were evaluated in the same manner as in Example 1, and the same good evaluation results as in Example 1 were obtained.

Embodiment 76

[0631] use has figure 2 An automatic development processor of the configuration shown (LP1250PLX, manufactured by FUJIFILMCorp.) image-exposed the lithographic printing plate precursor of Example 1 in the same manner as in Example 1, and subjected to development processing within 30 seconds. The automatic development processor is composed of a preheating unit, a pre-washing unit, a developing unit, a washing unit, and a finishing unit in this order. The heating condition in the preheating unit was 100° C. for 10 seconds. Into the developing bath, developer solution 1 was supplied. Do not supply any liquid to the pre-washing unit, washing unit and touch-up unit, but only use their delivery function. Except for the above-mentioned development treatment, developability, print image forming performance, handling performance and printing durability were evaluated in the same manner as in Example 1, and the same good evaluation results as in Example 1 were obtained.

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Abstract

A process for producing a lithographic printing plate which comprises treating a lithographic printing plate precursor having a photosensitive layer containing a hexaarylbiimidazole compound and a protective layer with a developing solution containing a specific organic solvent and at least either a surfactant or a water-soluble polymer. The generation of development scum is inhibited in the process, and both satisfactory developability and satisfactory printing durability can be attained. The printing plate precursor can be treated with one bath, which is the weakly alkaline developing solution. The process hence has merits including simplification of treatment steps, friendliness to the global environment, space saving, and suitability for a reduction in running cost.

Description

technical field [0001] The present invention relates to a method of preparing lithographic printing plates. Background technique [0002] Typically, lithographic printing plates consist of oleophilic image areas that accept ink during printing and hydrophilic non-image areas that accept dampening water. Lithography is a printing process that involves the steps of making the oleophilic image area of ​​a lithographic printing plate an ink-receiving area and its hydrophilic non-image area a wetting water-accepting area (ink-unaffected area), thereby causing the ink to Differences in adhesion on the surface of the lithographic printing plate, and the use of the property of water and printing ink to repel each other to deposit ink only in the image area, and then transfer the ink to a printing material such as paper. [0003] In order to prepare lithographic printing plates, a lithographic printing plate precursor (PS plate) comprising a hydrophilic support on which an lipophili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/32G03F7/00G03F7/029G03F7/032G03F7/11G03F7/30
CPCG03F7/033G03F7/032G03F7/092G03F7/322G03F7/031G03F7/0388
Inventor 因埜纪文
Owner FUJIFILM CORP
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