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Cause Analysis:
If the surface of the film is not corona treated or the surface tension of the film is lower than the surface tension of the ink, the ink is not easily adhered; the unused ink does not match the characteristics of the film material or the use of a special ink ; And the use of expired or invalid ink will inevitably occur such failure. In addition, the drying device (UV or infrared hot air drying) has low power, so that the ink can not be completely dried or the printing ink layer is too thick, the ink is too large, the ink viscosity is too large to make the ink brittle after long drying, Surface printing ink layer attached to the poor tolerance, easy to drop ink.

Solution:
1, to improve the surface tension of the printing material, requiring surface tension value to reach 38 dyne / cm or more;
2, rotary label machine should be installed corona device, through the random corona is the industry to improve the surface tension of the film;
3, you can first use a transparent solvent-based ink to reserve the base to improve the surface tension of the printing material;
4, selected with the printing material to match the special ink and supporting additives;
5, to improve the drying or curing power, or reduce the speed of the machine to increase the drying time;
6, printing ink to be as thin as possible, the amount of ink should be as little as possible, when necessary, monochrome multiple overprint;
7, recommended self-adhesive label printing after UV coating to protect the printing ink layer, increase the adhesion of ink layer fastness