Self-supporting zipper bag is a kind of composite soft packaging often used in daily life. There are self-supporting zipper bags, three-sided zipper bags, flat bottom eight-sided zipper bags and other bag types. And there are many patterns. However, the self-supporting zipper bag is prone to failure. The food packaging bag customization company has conducted a detailed analysis of the failure of the self-supporting zipper bag. Hope to help everyone!

1. free-standing zip pocket flex.

1. The balance between film tension and chain tension is not good.

(1) The tension of the adjusting roller is too weak.

(2) The opening of the zipper tape is too tight.

(3) The zipper belt does not slide well.

(4) Zipper plate slot is too narrow.

(5) The zipper plate does not slide well.

(6) The film slides poorly on the inclined plate/M plate.

2. zipper heat sealing temperature is too high.

3. The tension of the rubber roller under the zipper is constant, and the tension difference of the roller is adjusted elastically.

2. self-supporting zipper bag with local poor heat sealing

1. Zipper heat sealing plate mixed with foreign matter (polyethylene residue and dust).

2. The surface of the PTFE installed on the zipper frame is damaged or there are foreign objects.

3. The PTFE surface of the zipper plate is damaged or has foreign matter.

4. The zipper plate is partially damaged or deformed.

3. either end of the heat-sealed part of the self-supporting zipper bag zipper tape is not heat-sealed or the heat-sealing strength is weak.

1. The thickness of the zipper tape is not suitable.

2. The position of the zipper heat sealing plate is not aligned with the tape.

4. self-supporting zipper bag zipper anastomosis welding

1. zipper heat sealing temperature is too high.

2. Zipper heat sealing position offset, press the matching part.

3. Waiting time is too long, affected by preheating.

There is no problem 5. the elastic adjustment roller, but the edge and pattern of the zipper frame are deviated.

1. The position of the zipper plate is too low, the lower film and the lower side are heat sealed, and the cooling plate produces friction. Or affected by the preheating of the lower heat seal.

2. The rubber roller on the lower side of the zipper does not hold the film well, causing the film to slip.

3. The position of the upper separation roller of the lower rubber roller of the zipper is not set well.

4. The tension of the slack adjustment roller is too small.

6. self-supporting zipper bag zipper fit strength is too small.

1. The bonding strength of the original zipper tape itself is too small.

2. The heat jacket on the opening side/inner bag side of the zipper tape is upside down.

3. The zipper heat sealing temperature is set too high, which deforms the mating part, especially the concave part opens.

4. At the zipper plate, the flow of the film deviates from the angle of the zipper plate, and the edge of the zipper plate rubs against the mating portion.

5. The rubber roller pressed the anastomosis.

6. The edge of the rubber roller groove friction fit.

7. When making two rows of bags, the film (especially OPP/CPP) is thermally shrunk, and the two rows of bag making plates in the center of the zipper plate rub against the matching parts.

8. The top cooling plate is too wide, pressing on the anastomosis.

9. The gap between the upper and lower rubber roller strings is too small, and the zipper fitting part of the self-supporting zipper bag is too tight.

Excessive gas backlog during heat sealing of the 7. in the field.

1. Longitudinal heat sealing temperature is set too high.

2. The longitudinal pressure is too high, and the heat-sealed edge is pressed into the rubber table.

3. The rubber table is worn or uneven.

4. The width of the cooling plate (upper) is too large, and the top heat seal is not pressed down.

5. In the longitudinal heat-sealed Teflon roll, thick Teflon cloth is used to inhale air.