Writer： admin Time：2023-11-23 15:06 Browse：℃
Flatness is one of the indicators to measure the appearance quality of food packaging bags. In addition to material factors, the flatness of food packaging bags is also related to factors such as heat sealing temperature, heat sealing pressure, heat sealing time and cooling effect.
If the heat sealing temperature is too high, the heat sealing pressure is too high, or the heat sealing time is too long, the composite film will shrink and deform. Insufficient cooling will result in insufficient setting after heat sealing, internal stress cannot be eliminated, and the bag will be wrinkled. Therefore, the process parameters should be adjusted and the cooling water circulation system should work normally.