Reason 1: The ink dries too fast.
Solution: reduce the amount of solvent to reduce the drying speed of the ink; or re-adjust the ink to slow drying ink; or reduce the viscosity of the ink.
Reason two: The PH value of the ink is too low.
Solution: Check the PH value of the ink? Adjust the PH value to a specified range.
Reason three: The fluidity of the ink is too poor (large viscosity).
Solution: Because there is air at the printing indentation line, so to cause this situation, you can install a baffle or reduce the airflow.
Reason four: Poor printing conditions.
Solution:
(1) The roller is too hot: the heat of the discharge roller should be reduced to cool the roller.
(2) The amount of ink in the ink fountain is insufficient: check the amount of ink in the ink fountain, and add new ink to the ink fountain if necessary.
(3) The printing speed is too slow: the printing speed should be increased.
(4) The blade of the doctor blade is too sharp: the blade of the doctor blade should be slightly flat.
(2) How to solve the dirty version?
A dirty plate is a non-graphic part of the printing plate cylinder that is also glued with a hazy layer of resin (resin entrained in the resin) and transferred to the substrate to make the printed matter appear dirty.
1. The main reasons for the dirty version are as follows:
(1) The resin has an affinity for the chrome-plated surface of the roller, making it difficult for the doctor blade to scrape off the ink.
(2) The system composed of resin and organic solvent is in supersaturated state, and a large amount of resin is precipitated, which is not dissolved by the solvent.
(3) The wettability of the ink on the chrome-plated surface is too strong, or the solvent used in the ink is a slow-drying solvent.
2. Solution:
(1) Use solvents with strong dissolving power and fast evaporation.
(2) Control the viscosity of the ink. In the production process, the solvent should be used according to the actual situation, and added in time according to the loss of various solvents to maintain the stability of the ink viscosity.
(3) Fresh ink is often added.
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