Three kinds of coating process of release film
May 12, 2023
First process:
Scraper coating: Scraper coating often has uneven glue coating. PET release film manufacturers mainly have a lot to do with the processing accuracy of the scraper, the installation method of the scraper, the angle between the scraper and the rubber wheel, and the viscosity of the coating. The flatness of the scraper requires high precision, that is, the scraper does not warp, deform, or notch, otherwise the coating error will be large. When applying glue, the angle between the contact tangent line of the scraper and the rubber wheel is generally between 15 degrees and 30 degrees. If it is too large, the scraper may be on the back of the rubber wheel. The rubber wheel tends to vibrate when it is running, resulting in uneven glue application and large differences in the amount of glue applied. It may even cause unevenness and scratches on the surface of the coating film, and damage to the blade.
Second process:
Light-duty roller coating: This is a coating method that uses two or more rollers to transfer, and the amount of coating can be adjusted by adjusting the gap and speed ratio between the rollers. The structure of this coating method is relatively complicated. The processing precision and assembly precision of the rubber roller, coating roller, traction roller and scraper are very high. Because this kind of coating machine uses high-precision smooth rollers to coat the rubber, the coating effect is good, and the coating amount can be adjusted not only by the gap between the rubber roller and the coating roller, but also by the adjustment of the coating blade. Fine-tuning to achieve control, high coating accuracy.
The third process:
Roller coating: This kind of gluing equipment mainly adopts roller coating, which has good coating uniformity and accurate coating amount. But the disadvantage is that it is difficult to adjust the amount of glue applied. When using roller coating, the amount of glue applied is related to the depth of the concave hole of the roller and the characteristics of the glue itself.
