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On-press development of thermosensitive lithographic plates

A lithographic printing and lithographic technology, applied in lithographic printing equipment, printing, printing technology, etc., can solve the problems of poor printing durability

Inactive Publication Date: 2003-10-29
加里・滕钢辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this lithography is useful, it has the disadvantage of poor print permanence because the imaging layer in the exposed areas is not hardened (cross-linked) and is then washed out quickly during the printing operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] In the preparation of the printing plate of the present invention, any heat-sensitive layer having the following properties is suitable: the heat-sensitive layer can be hardened or solubilized after exposure to infrared radiation (wavelength above 750 nm), and it is not hardened or The solubilized regions can be dissolved or dispersed in ink (for dry plates) or in ink and / or fountain solution (for wet plates). Hardening here means becoming insoluble or non-dispersible in ink and / or fountain solution (female die-making), solubilizing means becoming soluble or dispersible in ink and / or fountain solution In the liquid (male mold plate). Hardening is generally achieved by crosslinking or polymerization of the resin (polymer or monomer), while solubilization is achieved by decomposition of the resin or its functional groups. Infrared absorbing dyes or pigments are often used in the thermal layer to convert radiation into heat. The coating amount of the heat-sensitive layer...

Embodiment 1

[0053] Coating of Thermal Layer Formulation TS-1 using a #6 Meyer rod on electrochemically grained, anodized and polyvinylphosphonic acid treated aluminum panels followed by oven drying at 70°C for 5 minutes .

[0054] components

weight ratio

Epon 1031 (epoxy resin from Shell Chemicals)

2.114

Cyracure UVR-6110 (epoxy resin from Union Carbide)

3.442

Cyracure UVI-6990 (cationic initiator from Union Carbide)

1.387

Microlith Black C-K (charcoal dispersed in polymer binder from Ciba-Geigy

black)

3.750

ethyl acetate

78.590

acetone

10.717

[0055] Infrared laser lithographic imaging device (ThermalSetter, from Optronics International) exposed the above-mentioned lithographic plate. Laser diodes (8 channels, each about 500 mW) were installed on the lithographic imaging device, the emission wavelength was 830 nm, and the laser size was about 15 microns. The plate was placed on an imaging drum ...

Embodiment 2

[0058] On electrochemically grained, anodized, and polyvinylphosphonic acid-treated aluminum panels, thermal layer formulation TS-2 was coated using a #6 Meyer bar, followed by oven drying at 70°C for 5 minutes.

[0059] components

[0060] The lithography was exposed and developed manually as in Example 1. Patterned areas of exposed lithography appear dark blue. The lithographic plates with less than 8 back and forth wiping times were fully developed, and the non-patterned areas of the heat-sensitive layer were completely removed. The pattern area of ​​the plate is developed and the pattern is well inked and the background is clean.

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Abstract

The present invention provides an on-press developable lithographic plate that can be developed with ink and / or fountain solution, the base material of the lithographic plate has a thermally sensitive layer that can be hardened or solubilized under infrared laser irradiation. The lithographic plate can be imaged by infrared laser exposure, and then the printing plate cylinder is rotated to drive the ink and / or fountain solution roller, and the lithographic plate is developed on the printing machine with ink and / or fountain solution. The developed lithographic plate can then print the image directly onto the printing sheet. Exposure imaging can be performed off-press, or while the plate is mounted on the plate cylinder of the lithographic printing press.

Description

technical field [0001] The present invention relates to lithographic printing plates (lithographic plates). More specifically, the invention relates to the on-press development of lithographic plates with inks and / or fountain solutions, said lithographic plates having a thermally sensitive layer on a substrate which can be hardened or solubilized upon irradiation with an infrared laser . Background technique [0002] Lithographic plates (after processing) generally consist of ink-receiving areas (patterned areas) and ink-repelling areas (non-patterned areas). In a printing operation, the patterned areas, but not the non-patterned areas, selectively receive ink, which is then transferred to the surface of the material to be patterned. The ink is usually transferred to a media material called a printing blanket, which in turn transfers the ink to the surface of the material to be patterned. [0003] Currently, lithographic (processed) plates are usually prepared from lithog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/004B41C1/10B41N1/14G03F7/00G03F7/029G03F7/11
CPCB41C1/1008B41C1/1016B41C2210/04B41C2210/08B41C2210/22B41C2210/24B41C2210/16Y10S430/145Y10S430/146Y10S430/165
Inventor 加里·滕钢辉
Owner 加里・滕钢辉
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