Because the ink has certain corrosive action, it not only corrodes the PVC facial mask, also can corrode the pressure sensitive adhesive. When the pressure-sensitive adhesive is corroded, the adhesive properties of the adhesive are affected, and it is easy to appear in the curl of the PVC mask. This situation is especially evident when the volume of the adhesive is heavy. In this case, it is suggested to spray a good picture of the white edge of 5~ 10mm, so that you can effectively solve the problem of the surrounding volume.
Secondly, after the surface layer PVC film is sprayed with deep ink, the solvent in the ink is caused by the contraction of the membrane, resulting in the separation of the underlying materials.
Improvement measures:
1, in the process of print, set aside 5 ~ 10 mm gap, after print products, 24 hours a day, aimed at both sides under the condition of fixed, after a period of time, PVC molecular chain through their movement, eliminate the PVC membrane caused by contact printing ink solvent swelling effect, thereby eliminating shrinkage effect of PVC film.
2, before the paste body to stick to the underlying material processing, to ensure that the underlying material no water, no oil, clean, no foreign body, special for the metal layer material, if oil and rust, must go through grinding and surface treatment (e.g., phosphate) program to deal with.
