The treatment method for bubble formation in protective film.
(1) Choosing the appropriate ink and increasing the coating amount are particularly important for the selection of dry composite white ink, as their impact is multifaceted.
(2) Enhance the wettability of the adhesive on the film, improve the defects of poor local adhesion, increase the coating amount, raise the temperature and pressure of the composite roller, use a smooth roller, reduce the composite speed, increase the wetting time and adhesion time, select adhesive with good wettability and preheat it.
(3) Preheat the glue and film and increase the temperature of the composite pressure roller.
(4) Clean the coating roller, strengthen the management of coating amount and coating roller.
(5) Adjust the viscosity, replace the coating roller, and meet the coating amount requirements within the viscosity range that meets the process requirements by coordinating the adhesive solid content with the coating roller.
(6) Adjust the drying conditions.
(7) Increase the coating amount and the temperature and pressure of the composite pressure roller, improve the rubber hardness of the pressure roller, increase the rubber hardness of the pressure roller to between 80-85 ℃, and adjust the “wrapping angle” of the film introduced before the pressure roller to enter the composite roller in the tangential direction as much as possible.
What are the common problems with protective film.
1. The problem of delamination on the surface of the protective film is more common on the surface protective film of profiles. When the user tears off the surface protective film from the profile surface after installing and constructing the profile, the adhesive on the surface protective film does not follow the surface protective film, but remains on the profile product. If this problem occurs, a clean cloth dipped in a small amount of alcohol can be used to repeatedly wipe the remaining sensitive adhesive until it is wiped clean. However, it should be noted that do not apply too much force during wiping, otherwise it may affect the smoothness of the profile product. If the surface to be pasted is a high gloss plastic surface, the requirements for residual adhesive are also relatively high. At this time, it is generally recommended to choose a low to medium adhesive protective film. If the surface is made of board or similar materials, a protective film with low adhesion is also required, Usually it looks medium sticky.
2. If the protective film does not stick firmly to the product and falls off during transportation and use, it is because the adhesive strength of the protective film is insufficient. If this problem occurs, it is necessary to promptly take appropriate measures and replace the protective film with a suitable adhesive.