the reason:
1) The proper handling of the printed substrate is poor, and the wetting tension is low.
2) Additives (plasticizer, surfactant slip agent, etc.) in the printing substrate film form a precipitation layer, which affects the adhesion fastness of the ink layer.
3) The printed substrate absorbs moisture itself.
4) Poor performance of ink, misuse of ink or mixing of different inks.
5) Changes in ink performance (deterioration, whitening).
6) Poor drying and many residual solvents.
7) The package contents and environmental conditions reduce the adhesion fastness.
Countermeasure:
1) Measure the wetting tension, and replace the printing substrate if it fails. Corona-treated films have the most important degree of treatment. Whether the treatment is qualified and whether it is determined by the wetting tension measuring solution
2) Confirm the precipitation on the surface. If the precipitation layer affects the fastness of ink adhesion, replace the printing substrate or consult with the ink manufacturer for proper disposal. When using a certain film for the first time, it is necessary to investigate its properties and characteristics in detail as much as possible beforehand, and select an appropriate ink.
3) Replace the ink or confirm the proper adhesion of the ink to the ink. Most gravure inks are produced for specific uses, and should be avoided for other uses or mixing of different inks. In addition, in order to prevent misuse, the relevant content and date of the residual ink should be clearly recorded for reuse.
4) Solve the problem of ink deterioration and whitening.
5) Adjust the drying conditions to solve the residual solvent problem or reduce the residual solvent to the prescribed limit.
6) Implement humidity control at the printing site. The films and printed materials such as vinylon, cellophane, nylon, etc., which are easy to absorb moisture, are properly stored to prevent moisture.
7) Fully consider the influence of packaging contents and environmental conditions on the fastness of ink adhesion.
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