Treatment method for bubble formation in protective film.
(1) Choosing the appropriate ink and increasing the coating amount is particularly important for the selection of dry composite white ink, and its impact is multifaceted.
(2) Enhance the wettability of the adhesive on the film, improve the defects of local adhesive defects, increase the coating amount, increase the temperature and pressure of the composite roller, use a smooth roller, reduce the composite speed, increase the soaking time and adhesive application time, select adhesive with good wettability and preheat.
(3) Preheat the adhesive and film and increase the temperature of the composite roller.
(4) Clean the coating roller and strengthen the management of coating quantity and coating roller.
(5) Adjust the viscosity, replace the coating roller, and within the viscosity range that meets the process requirements, meet the coating amount requirements by combining the solid content of the adhesive with the coating roller.
(6) Adjust the drying conditions.
(7) Increase the coating amount and the temperature and pressure of the composite pressure roller, increase the rubber hardness of the pressure roller, increase the rubber hardness of the pressure roller to 80-85 ℃, and adjust the "wrap angle" of the film introduced before the pressure roller to enter the composite roller as much as possible in the tangential direction.
