During the production of protective film products, bubbles sometimes appear, which is very troublesome. In order to solve this problem, many methods have been thought out, such as selecting appropriate ink and increasing the coating amount, enhancing the wettability of glue to the film, and improving the defects of poor local gluing; Increase the temperature and pressure of the compound roll; Reduce the compounding speed, increase the soaking time and gluing time, etc.
When making the protective film, the glue and film can be preheated and the temperature of the composite pressing roller can be increased; At the same time, clean the coating roller and strengthen the management of coating amount and coating roller. For the coating roller, generally, the new roller shall be aluminized after being used to 5 million meters, and then engraved after three times of chromium plating, so as to prevent the problems of poor appearance and low peel strength caused by insufficient coating roller.
In order to adjust the viscosity of the protective film, pay attention to changing the coating roller regularly. Within the viscosity range that meets the process requirements, the requirements of coating amount can be met through the cooperation of glue solid content and coating roller. And adjust the drying conditions, such as wind speed, temperature, etc.
In addition, it is also necessary to increase the coating amount for manufacturing the protective film and the temperature and pressure of the composite press roll, improve the rubber hardness of the press roll, and increase the rubber hardness of the press roll to 80-85 ℃. Adjust the "wrap angle" of the film before pressing the roll, and enter the compound roll in the tangent direction as far as possible.
In addition, taking moisture-proof measures in the forming process of the protective film, such as keeping the environment dry, curing agent and sealing packaging materials, can also play a certain effect on improving the bubble problem, so as to greatly improve the quality and use effect of the protective film.
