How to deal with the whitening phenomenon of printing ink film
Time:2025-11-28
Views:58
1.Dot whitening
The main reason is the poor solubility of wax surfactants in the ink system; The second reason is that the ink is transferred to the graphic and text after the printing process is not dissolved due to the ink coating.
Solution: Aromatic hydrocarbons or ester solvents should be added to promote their re dissolution. Alternatively, a stirrer can be installed in the ink fountain (such as using plastic tubing, wrapping it with unprinted plastic film on the outside, and then tightening both ends tightly and randomly rotating it in the ink head to mix the ink), or antioxidant treatment can be added during ink manufacturing.
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2. Dot style white dots
The main reason is caused by ink static electricity or substrate static electricity. Or it may be caused by static electricity generated by diluting solvents (as the resistance of different solvents varies). It usually occurs when the temperature is high or the printing speed is fast. Secondly, during the lamination process, the front is tight and then loose, or the front is loose and then tight, while static electricity is commonly caused in humid weather.
Solution: An appropriate amount of anti-static agent can be added to the ink (excessive amount will affect the composite fastness), and a solvent with lower resistance can be selected to dilute the ink. Adjust the placement and collection of grounding wires (generally at a depth of 700-1500mm) for treatment.
3.Crack like whitening
The main reasons are that the ink transfer performance is too poor, and the printing plate pattern is too shallow, which easily causes the solvents in the ink system to evaporate too quickly. Generally, rough imprints lead to poor film formation, especially whitening caused by the addition of ink systems or ink fountain diluents that absorb moisture, which mostly occurs in environments with high humidity in summer workshops.
Solution: Replace the ink with good transferability or replace the printing plate with a darker one. Thirdly, add a slow drying solvent for treatment.
4.The whitening of the entire imprint
The main reason is that when the continuous printing time is too long, the operator repeatedly adds a single solvent when the ink viscosity becomes sticky or thick, thereby breaking the evaporation balance of the mixed solvent in the original ink system, causing the ink layer to become rough and white when the printing ink film is formed. Secondly, even if the operator adds a mixed solvent, excessive addition often leads to a relative decrease in the content of synthetic resin in the ink, and the above-mentioned whitening phenomenon can also occur.
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