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Analyzing the reasons for the curling of food packaging bags for you.
2022-02-22
After packaging products, food packaging bags may experience issues such as curling, uneven packaging, and deformation. What could be the reasons for these phenomena? How can manufacturers of these bags avoid such situations? I believe many food manufacturers have encountered this situation to varying degrees. After using plastic food packaging bags to package products, the overall surface of the packaging appears curled, the bags are twisted and deformed, and the packaging is uneven. What are the main reasons for these problems, and how should we solve them?
Let's first analyze the main reasons for packaging curling and deformation:
1. The surface substrate film has poor heat resistance, causing the edges to curl up when exposed to high temperatures.
2. Improper control of the tension matching of the composite substrate during the composite process leads to residual stress after curing and shaping, especially when the thickness of the composite film is relatively thin, making such failures more likely.
3. Inconsistent thickness of the composite film.
4. Insufficient cooling; the temperature did not reach the shaping temperature.
5. Insufficient curing time.
6. In the longitudinal heat sealing knife section, the running trajectory of the composite film is not straight.
7. The heat sealing temperature is too high or the heat sealing time is too long.
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