Material of lithographic printing plate, process for producing material of lithographic printing plate, and method of printing

A technology of lithographic printing plate and manufacturing method, which is applied in the preparation of printing surface, printing, printing process, etc., which can solve the problems of reduced developability, insufficient printability, increased sensitivity, etc., and achieves the effect of excellent resistance to pressure turbidity

Inactive Publication Date: 2008-03-05
KONICA MINOLTA MEDICAL & GRAPHICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these printing plate materials have problems such as insufficient printing durability due to the weak film strength of the image forming layer itself, and pressure turbidity (pressure capri) is likely to occur in the non-image portion before development.
These problems have been improved by adding a water-soluble resin or a thermoplastic resin to the image forming layer (Patent Document 3), but in the case of printing using self-adhesive powder, there is insufficient printability. Resin reduces on-machine developability, increases energy necessary for image formation (reduced sensitivity), and lowers productivity, which is a new issue

Method used

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  • Material of lithographic printing plate, process for producing material of lithographic printing plate, and method of printing
  • Material of lithographic printing plate, process for producing material of lithographic printing plate, and method of printing
  • Material of lithographic printing plate, process for producing material of lithographic printing plate, and method of printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0318] (Preparation of support)

[0319] (PET resin)

[0320] To 100 parts by mass of dimethyl terephthalate and 65 parts by mass of ethylene glycol, 0.05 parts by mass of magnesium acetate hydrate was added as a transesterification catalyst, and transesterification was performed according to a conventional method. To the obtained product, 0.05 parts by mass of antimony trioxide and 0.03 parts by mass of trimethyl phosphate were added. Then, the temperature was raised slowly, the pressure was reduced, and polymerization was carried out at 280° C. and 0.5×9.8 Pa to obtain a polyethylene terephthalate (PET) resin with an intrinsic viscosity of 0.70.

[0321] Using the PET resin thus obtained, a biaxially stretched PET film was produced as follows.

[0322] (biaxially stretched PET film)

[0323] The granulated product of PET resin was vacuum-dried at 150°C for 8 hours, then, at 285°C, it was melt-extruded from a T die to form a layer, and static electricity was applied on a c...

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PUM

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Abstract

A material of lithographic printing plate excelling in on-press developability, printing plate life and pressure fogging resistance; a process for producing the material of lithographic printing plate; and a method of printing with the use of the material of lithographic printing plate. There is provided an on-press developable lithographic printing plate material including a support and, superimposed thereon, a hydrophilic layer and a thermosensitive image forming layer, characterized in that the hydrophilic layer is one produced by coating the support with a coating material containing a compound having an unsaturated bond capable of addition polymerization and a polymerization initiator and effecting polymerization of the compound having an unsaturated bond capable of addition polymerization.

Description

technical field [0001] The present invention relates to a lithographic printing plate material developed on a printing press after drawing an image, a method of manufacturing the lithographic printing plate material, and a printing method using the lithographic printing plate material. Background technique [0002] In recent years, computer-to-plate (CTP), which records image data on a direct printing plate, has been popularized along with digitization of printing data. Generally, printing plate materials used in CTP are the same type using an aluminum support as the current PS plate and a flexible type in which various functional layers as a printing plate are provided on a film base material. [0003] In recent years, in the field of commercial printing, there is a tendency to print a small amount of multiple types, and there is a strong demand for high-quality and low-priced printing plate materials in the market. As the current flexible printing plate material, for exam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41N1/14G03F7/004B41C1/055G03F7/11G03F7/00
CPCG03F7/11B41N3/03G03F7/09B41N1/14Y10T428/24802
Inventor 前桥达一
Owner KONICA MINOLTA MEDICAL & GRAPHICS INC
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