In the production process of protective film products, bubble problems sometimes occur, which is very troublesome.
In order to solve this problem, many methods have been conceived, such as
1. selecting a suitable glue and increasing the coating amount
2. enhancing the wettability of the glue on the film, improving the defect of partially uneven gluing
3. increase the temperature and pressure of the composite roll
4. reduce the compounding speed
5. increase the infiltration time and the glue application time, and etc.
During the production of protective film, we can preheat the glue and the film and raise the temperature of the composite press roll.
At the same time, clean the coating roller to enhance the coating amount and the management of the coating roller.
For the coating roller, the new roller should be subjected to aluminizing treatment after being used up to 5 million meters.
The re-engraving process should be performed after re-chrome plating for three times, to prevent appearance defect and lowered peeling strength due to insufficient coating roller.
In order to adjust the viscosity of the protective film, it is necessary to replace the coating roller regularly.
In the range of required viscosity, the coating amount can be satisfied by the cooperation of the binder solid content and the coating roll.
And adjust the drying conditions, such as wind speed, temperature and etc.
In addition, should increase the coating amount for producing protective film and the temperature and pressure of the composite press roll.
Increase the rubber hardness of the press roll to 80 - 85.
Adjust the angle of the "wrapping angle", which feeds the film before the pressure roller, and enter the composite roller as far as possible in the tangential direction.
In addition, take moisture-proof measures during the molding process of the protective film, such as keeping the environment dry, and sealing the packaging material, etc., can also have a certain effect on improving the bubble problem, thereby greatly improving the quality and use effect of the protective film.