Treatment method of metal printing plate surface for offset-printing plate-making

A processing method and printing plate technology, applied in the field of printing plates, can solve problems such as environmental pollution

Active Publication Date: 2009-05-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during anodic oxidation, a large amount of acid and alkali must be used to pretreat the aluminum plate base, and the waste liquid of acid and alkali will cause great pollution to the environment.

Method used

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  • Treatment method of metal printing plate surface for offset-printing plate-making
  • Treatment method of metal printing plate surface for offset-printing plate-making
  • Treatment method of metal printing plate surface for offset-printing plate-making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Use 200# (particle size: 83.0 μm) sandpaper to polish the surface of the aluminum plate base at a pressure of 0.5KPa. After sanding, apply hydrophilic polymer paint. Weigh 0.75g of gelatin and 0.25g of silicon dioxide (with a particle size of 2-3μm), put them into a 100ml Erlenmeyer flask, add 49g of distilled water, and stir for 6-10 hours to fully dissolve them. Cut the aluminum plate into 10×10cm 2 , washed with acetone and distilled water successively, and dried. On the glue leveler, the coating composition is coated on the aluminum plate by the spin coating method, and the coating amount is 1g / m by controlling the speed of the glue leveler 2 . Bake at 200°C for about 1 hour, and measure the contact angle, Ra value and adhesion of the plate, see Tables 1, 2 and 3. The scanning electron micrographs of the surface of the polished and coated aluminum plate base are shown in Figure 2 (1500 times magnification, scale bar: 10 μm / cm) and Figure 4 (8000 times magnificat...

Embodiment 2

[0039] Use 300# (particle size: 111.1μm) sandpaper with a grinding pressure of 2.5KPa, and apply a hydrophilic polymer coating after grinding. Weigh 0.5g polyvinyl alcohol (polymerization degree 2500, alcoholysis degree 88%), 0.5g polyvinylpyrrolidone K-30, 0.25g silicon dioxide (particle diameter is 10~20nm), put into 50ml Erlenmeyer flask, add 23.75g distilled water, 5ml ethanol, stir for 6-8 hours to fully dissolve. Cut the aluminum plate into 10×10cm 2 , washed with acetone and distilled water successively, and dried. On the glue leveler, the coating composition is coated on the aluminum plate by the spin coating method, and the coating amount is 2.5g / m by controlling the speed of the glue leveler 2 . Bake at 200°C for 0.5 hours, measure the contact angle, Ra value and adhesion of the plate, see Tables 1, 2 and 3.

Embodiment 3

[0041] Use 400# (grain size: 155.6 μm) sandpaper with a grinding pressure of 0.75KPa to polish the surface of the aluminum plate base. After sanding, apply hydrophilic polymer paint. Weigh 1g of gelatin and 0.25g of silicon dioxide (with a particle size of 2-3μm), put them into a 50ml Erlenmeyer flask, add 23.75g of distilled water, and stir for 6-10 hours to fully dissolve them. Cut the aluminum plate into 10×10cm 2 , washed with acetone and distilled water successively, and dried. On the glue leveler, the coating composition is coated on the aluminum plate by the spin coating method, and the coating amount is 1.5g / m by controlling the speed of the glue leveler 2 . Bake at 150°C for about 1 hour, and measure the contact angle, Ra value and adhesion of the plate, see Tables 1, 2 and 3.

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Abstract

The invention belongs to the field of printing plate materials, relates to a metal plate base without electrochemistry anodic oxidation treatment, in particular to a treatment method of the surface of the metal plate base used for offset printing plate-making. The metal plate base used for offset printing is not treated by anodic oxidation and directly uses sand paper of different sand meshes for evenly sanding the surface thereof in transverse direction and longitudinal direction, so as to lead the surface of the metal plate base to have even roughness (Ra equals to 0.6-3Mum), the sanded metal plate base is washed and dried and the surface thereof is coated by hydrophilic polymer coating and then dried to obtain the metal plate base used for offset printing plate-making. The contact angle between the obtained metal plate base used for offset printing plate-making and the water is 2.0-76.2 degrees.

Description

technical field [0001] The invention belongs to the field of printing plate materials, relates to a non-electrochemical anodic oxidation-treated metal plate base, and more particularly relates to a treatment method for the surface of a metal plate base for offset printing plate making. Background technique [0002] Offset printing has fast printing speed and stable process performance, and it plays a leading role in text, picture and news printing. Therefore, the offset printing plate is a printing plate commonly used at home and abroad. Offset printing is mainly divided into two printing methods: PS plate (pre-coated photosensitive lithography) and CTP plate (computer-to-plate). At present, the printing plate base mainly uses aluminum plate bases, and metal plate bases such as zinc plates can also be used. In order to improve the printing durability and resolution of the aluminum plate base, the aluminum plate is usually anodized and grained (seeing CN85100875). However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41N3/00B41N3/04B41N3/08
Inventor 周海华宋延林
Owner INST OF CHEM CHINESE ACAD OF SCI
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