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PET reticulated protective film manufacturers talk about solutions to bubble generation

by:Skypro     2021-04-18
PET reticulated protective film manufacturers talk about solutions to bubble generation 1) Choose the right ink and increase the coating amount. The choice of dry composite white ink is particularly important, and its influence is multifaceted;

(2) Strengthen the wettability of the glue to the film, improve the defects of local poor bonding; increase the amount of coating; increase the temperature and temperature of the composite roller For pressure, use a smooth roller. Reduce the compounding speed to increase the soaking time and glue time; choose the glue with good wettability and preheat it;

(3) preheat the glue and film to increase the temperature of the compound pressure roller;

(4) Clean the coating roller and strengthen the management of coating volume and coating roller. For coating rollers, generally new rollers are used to reach 5 million meters (5000R/S) and then subjected to aluminizing treatment, and re-engraving treatment after 3 times of chrome-plating treatment. Such management can prevent poor appearance of the house caused by insufficient coating rollers. And the problem of low peel strength. Eliminate static electricity on the film and pay attention to keeping the machine environment sanitary. The adhesive solvent is completely sealed and stored and filtered during use;

(5) Adjust the viscosity, replace the coating roller, and match the solid content of the glue with the coating roller , To meet the requirements of the coating amount in the viscosity range to meet the process requirements;

(6) Adjust the drying conditions, the air volume is small, and the solvent residue is easy to appear. In general, the nozzle wind speed of the drying furnace must reach 30-35m/s, the temperature of the first stage of the drying furnace is 50-60, the temperature of the second stage is 60-70, the temperature of the third stage is 70-80, and the inlet temperature of the first stage does not exceed 60;

(7) Increase the coating amount and temperature pressure of the composite pressure roller, increase the rubber hardness of the pressure roller, and increase the rubber hardness of the pressure roller to 80 ~ 85. Adjust the 'wrap angle' of the film introduced in front of the pressure roller Angle, make it enter the composite roller as far as possible along the tangential direction;

(8) Take moisture-proof measures, such as preventing moisture-absorbing materials such as nylon and cellophane from reacting with NCO groups to form CO2 after absorbing moisture. Keep the environment dry. Seal paint etc. with curing agent.

(9) Increase the coating amount of the protective film and the temperature and pressure of the composite pressure roller, increase the rubber hardness of the pressure roller, and increase the rubber hardness of the pressure roller to 80 ~ 85. Adjust the film introduced in front of the pressure roller The angle of 'wrap angle' is to make it enter the composite roller along the tangential direction as much as possible;

(10) Moisture-proof measures are taken during the formation of the protective film, such as keeping the environment dry and sealing the packaging material with a curing agent. It plays a certain role in improving the bubble problem, thereby greatly improving the quality and use effect of the protective film.


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