Reason:
1. The heat sealing temperature is too high.
2. Excessive pressure.
3. The heat sealing time is too long.
4. The edge of the upper sealer is too sharp or the wrapped polytetrafluoroethylene is damaged.
5. The silicone rubber at the bottom seal is too hard.
During the compounding and maturation process, a portion of the adhesive penetrates into the interior of the film. Due to the penetration effect of the adhesive, the toughness (impact resistance) of the substrate decreases and the brittleness increases.
7. After cooling and placing, the heat sealing strength of plastic composite packaging bags increases, and there is also a tendency to become brittle.
