Reasons why the outer contour of the heat sealing surface of the plastic bag making machine is not clear:
1. Short cooling time.
2. Poor contact of the cooling plate.
3. As the silicone pad is heated, the edge part is melted.
4. The edge of the heat sealing knife is irregular and dull.
5. The longitudinal heat sealing force is uneven.
Countermeasures for the unclear outer contour of the heat sealing surface of the plastic bag making machine:
1. Adjust the cooling time.
2. Adjust the cooling plate.
3. Prevent edge melting caused by overheating of the silicone pad.
4. Replace or adjust the heat sealing knife.