What are the main reasons why printing plates are easy to get dirty?Technical Problems Of Offset Printing Plate

(1) Cause: insufficient exposure, poor transparency of the positive picture and aging of the light source. Treatment method: remake the positive picture and appropriately adjust the exposure time: Technical Problems Of Offset Printing Plate

     retest with a gray ladder to extend the exposure time, or replace the light source lamp.Technical Problems Of Offset Printing Plate

(2) Cause: the glass of the plate printer is a little dirty, and there is adhesive tape residue on the positive picture. Treatment method: remove dirt with glass cleaner and film cleaner.Technical Problems Of Offset Printing Plate

(3) Cause: during development, poor development is caused by blister adhesion, and the developer spray hole bubbles due to blockage.Technical Problems Of Offset Printing Plate Treatment method:Technical Problems Of Offset Printing Plate

       eliminate the cause of blistering: clean the developer spray hole.Technical Problems Of Offset Printing Plate

(4) Cause: hands are not clean (fingerprint stains) when using PS version. Treatment method: keep its mouth and back slightly during operation.

(5) Cause: the glue is thin. Treatment method: increase the glue concentration.Technical Problems Of Offset Printing Plate

(6) Cause: the adhesive layer falls off (when the adhesive layer is not dry, it shall be overlapped and stored again). Treatment method: do not keep it under high temperature and humidity.Technical Problems Of Offset Printing Plate

(7) Reason: after plate making, keep it under high temperature and humidity. Treatment method: do not store under high temperature and humidity.Technical Problems Of Offset Printing Plate

(8) Cause: the developer concentration is too low and the development is not complete. Treatment method: adjust the developer to the standard concentration.Technical Problems Of Offset Printing Plate

2. How to improve the development quality of positive PS version?Technical Problems Of Offset Printing Plate

The dilution ratio of the developer shall comply with the proportion specified by the PS manufacturer, and a small sample plate shall be used (the concentration of the developer can be measured by using the PS plate cut after exposure with Fuji gray ladder according to a certain amount of exposure.) Manage the developer concentration.Technical Problems Of Offset Printing Plate

3. In the printing process, there is often a dirty phenomenon on the blank of the printing plate. How to solve it?Technical Problems Of Offset Printing Plate

(1) Cause: when printing stopped, the printing plate was not rubbed with protective glue. Treatment method: wipe protective glue.Technical Problems Of Offset Printing Plate

(2) Cause: the blank part of the printing plate is not wet enough. Treatment method: appropriately increase the amount of water.Technical Problems Of Offset Printing Plate

(3) Cause: emulsification and dirt. Treatment method: adjust the balance between ink and bucket liquid, or replace ink and bucket liquid.Technical Problems Of Offset Printing Plate

4. Why are film collage publishing materials prone to falsehood?Technical Problems Of Offset Printing Plate

(1) Cause: improper collage of positive film. Processing method: Collage the film more than 3mm away from the image part.Technical Problems Of Offset Printing Plate