Reasons and Countermeasures for Bad Adhesion of Printing Inks
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1) Poor suitability of the printed substrate, and the wetting tension is low.
2) Additives (plasticizers, surfactant slip agents, etc.) in the printed substrate film form a precipitation layer, which affects the adhesion of the ink layer.
3) The printed substrate itself absorbs moisture.
4) Poor performance of ink, misuse of ink, or mixing of dissimilar inks.
5) Change in ink properties (deterioration, whitening).
6) Poor drying and more residual solvents.
7) Package contents and environmental conditions reduce adhesion.
Countermeasures:
1) Determine the wetting tension. If it fails, replace the printing substrate. Corona treatment of the film, the treatment of the most important. Whether the treatment is qualified or not, and it is determined by measuring the wetted tension test solution
2) Confirm the precipitation of the surface. If the precipitation layer affects the adhesion of the ink, replace the printing substrate or negotiate with the ink manufacturer for appropriate disposal. When using a certain kind of film for the first time, it is necessary to investigate the nature and characteristics of the film beforehand as much as possible, and select the appropriate ink.
3) Replace ink or confirm ink adhesion fastness. Gravure inks are mostly produced for specific applications and should be avoided for other uses or mixing of dissimilar inks. In order to prevent misuse, the relevant contents, dates, etc. 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 residual solvent problems or reduce residual solvents to specified limits.
6) Implement humidity control at the printing site. For films that are easy to absorb moisture, such as Vinylon, cellophane, nylon, etc., and prints are properly stored to prevent moisture.
7) Full consideration shall be given to the effect of the packaging contents and environmental conditions on the fastness of the ink.