FAQ 1. The sealing part between the zipper and the bag body is uneven; 2. Local delamination occurs at the part where the zipper is sealed with the bag body; 3. “Dead pleats” appear 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 both ends of the zipper and the edge seal of the bag. Solution After comparing and observing many kinds of zipper bags with undesirable phenomena, the above problems are related to the following matters: 1. The thermal shrinkage of the zipper itself is greater than that of the composite film; 2. The melting point of the zipper itself is greater than or equal to the melting point of the heat seal film; 3. The cross section of the snap fastener on the zipper is too large; 4. The design of local heat sealing rod on the zipper bag making machine is unreasonable, and it is recommended to use ultrasonic heat sealing device; 5. The design of local heat seal head is unreasonable (too small); 6. Insufficient output power or pressure of ultrasonic heat sealing device; 7. Insufficient heat resistance of ink layer; 8. The hardness of silicone rubber pad is not appropriate.
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