Method for making a lithographic printing plate

A technology for lithographic printing and printing plates, which is applied in the field of preparing lithographic printing plates, and can solve the problems of incomplete removal and low-sensitivity printing plates, etc.

Inactive Publication Date: 2008-09-24
AGFA NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such latex particles also tend to remain on the support in the unexposed state, again resulting in incomplete washout (removal of the coating during development), resulting in toning
[0011] On the other hand, well-stabilized latex particles are easily removed from the carrier without cleanup problems, but require higher energy for their coalescence and thus yield lower-sensitivity printing plates

Method used

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  • Method for making a lithographic printing plate
  • Method for making a lithographic printing plate
  • Method for making a lithographic printing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] 1. Preparation of lithographic supports.

[0059] Degreasing the 0.30 mm thick aluminum foil by immersing said aluminum foil in an aqueous solution containing 40 g / l sodium hydroxide at 60° C. for 8 seconds and rinsing with demineralized water for 2 seconds. Then, using alternating current, in an aqueous solution containing 12g / l hydrochloric acid and 38g / l aluminum sulfate (18-hydrate), at 33°C, at 130A / dm 2 The current density of the aluminum foil was electrochemically grained for 15 seconds. After rinsing with demineralized water for 2 seconds, the aluminum foil was decontaminated by etching with an aqueous solution containing 155 g / l sulfuric acid at 70°C for 4 seconds and rinsed with demineralized water for 2 seconds at 25°C. Then in an aqueous solution containing 155g / l sulfuric acid, at 45°C, at 22A / dm 2 Current density, aluminum foil was anodized for 13 seconds, then washed with demineralized water for 2 seconds, post-treated at 40°C with a solution containing...

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PUM

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Abstract

A method for making a lithographic printing plate is disclosed which comprises the steps of (i) providing a lithographic printing plate precursor comprising a support having a hydrophilic surface or which is provided with a hydrophilic layer, and a coating provided on said hydrophilic surface or said hydrophilic layer, wherein the coating comprises an image recording layer comprising hydrophobic thermoplastic polymer particles and wherein the image recording layer or an optional other layer of said coating further comprises an infrared light absorbing agent; (ii) image-wise exposing the precursor to infrared light having an energy density of 190 mJ / cm 2 or less; (iii) developing the exposed precursor by removing unexposed areas in a processing liquid; (iv) baking the plate thus obtained by keeping the plate at a temperature above the glass transition temperature of the thermoplastic particles during a period between 5 seconds and 2 minutes.

Description

[0001] [describe] field of invention [0002] The present invention relates to a method of preparing a wet lithographic printing plate by exposing a heat-sensitive negative-working lithographic printing plate precursor to infrared light, developing the exposed precursor, and then exposing said printing plate Proceed to a gentle baking step. Background of the invention [0003] Lithographic printing presses use so-called printing masters, such as printing plates, that are mounted on a cylinder of the printing press. A master has a lithographic image on its surface, ink is applied to the image, and the ink is then transferred from the master to a receptor material, typically paper, to produce a print. In conventional so-called "wet" lithography, ink is supplied to a lithographic image, along with an aqueous fountain solution (also called dampening solution), which consists of oleophilic (or hydrophobic, i.e. accepts ink, repels water) regions and Hydrophilic (or oleophobic, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/10
CPCB41C2210/22B41C1/1016B41C2210/06B41C1/1075B41C2210/04B41C2201/02B41C2201/14B41C2210/24B41C1/1008B41C1/1025B41C1/1083
Inventor E·弗舒伦
Owner AGFA NV
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