The main reason and disadvantage of offset printing plate is easy to get dirty
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(1) Reason: Underexposure, the transparency of the positive picture is not good, the light source is aging, and the treatment method: re-make the positive picture, moderately adjust the exposure time: re-test with the gray ladder, extend the exposure time, or replace the light source.
(2) Reason: The glass of the printing machine is a bit dirty, and the adhesive tape is attached to the positive picture. Treatment method: use glass cleaner and film detergent to remove dirt.
(3) Cause: During development, development failure is caused by the adhesion of the water bubbles, and the developer liquid orifice is foamed due to clogging. Treatment: Eliminate the cause of foaming: The developer orifice should be cleaned.
(4) Reason: The hand is not clean when using the PS version (there is fingerprint stain). Treatment method: Keep the mouth and back part of the operation.
(5) Reason: The glue is thin. Treatment method: increase the concentration of the glue.
(6) Reason: The rubber layer is peeled off (when the glue layer is not dry, it is overlapped and stored). Treatment: Do not store under high temperature and high humidity conditions.
(7) Reason: After the end of the plate making, it is kept under high temperature and high humidity conditions. Treatment: Do not store under high temperature and high humidity conditions.
(8) Reason: The developer concentration is too low and the development is not complete. Treatment method: Adjust the developer to the standard concentration.