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The following four types of problems are often encountered in the processing of zipper bags: 

1. The sealing part of zipper and bag body is not smooth; 

2. Local delamination occurs in the sealing part of zipper and bag body; 

3. There was a "dead fold" at the intersection of the two ends of the zipper and the edge seal of the bag;

4.Local delamination occurs at the intersection of the two ends of the zipper and the edge seal of the bag. 

The reasons for the above four types of problems are: 

1. The thermal shrinkage rate of zipper is greater than that of composite film; 

2. The melting point of the zipper itself is greater than or equal to the melting point of the heat sealing film; 

3. The section of the zipper buckle is too large;

4. The design of local heat sealing rod on zipper bag making machine is unreasonable, so it is recommended to use ultrasonic heat sealing device; 

5. Unreasonable design of local heat sealing head (too small); 

6. Ultrasonic heat sealing device output power is insufficient or pressure is insufficient; 

7. Ink layer heat resistance is insufficient; 

8. The hardness of the silicone rubber pad is not appropriate. 

Shandong Fubo Packaging has more than 20 years of production experience in flexible plastic packaging, customized all kinds of vacuum bags, zipper bags, food bags, medicine bags, industrial packaging, etc.