Jinan self sealing bag is made of polyethylene (LDPE) and high-pressure linear polyethylene (LLDPE) by blowing film and hot cutting machine-made bag, which can be repeatedly sealed. The self sealing bag can be used for the inner and outer packing of various small articles. The self sealed bags made of food grade raw materials can store all kinds of small food, tea, seafood, etc., which are moisture-proof, waterproof, insect proof and prevent things from scattering.

濟南自封袋熱封后袋子出現翹曲的原因可能是復合膜的厚度不一致，熱封溫度過高或熱封時間過長，在縱向熱封刀部分，復合膜的運行軌跡不平直?；蛘呃鋮s與熟化時間不夠充分，表層基材薄膜耐熱性較差。復合過程中復合基材的張力匹配控制不當，導致濟南自封袋熟化定型后仍有殘余的應力，尤其是復合膜厚度較薄時更容易發生此類故障。

The reason for the warpage of Jinan self sealing bag after heat sealing may be that the thickness of the composite film is not consistent, the heat sealing temperature is too high or the heat sealing time is too long, and the running track of the composite film is not straight in the longitudinal heat sealing knife part. Or the cooling and aging time is not enough, and the heat resistance of the surface substrate film is poor. In the process of compounding, the tension matching control of the composite substrate is improper, which leads to the residual stress of Jinan self sealing bag after curing, especially when the thickness of composite film is thin.

要解決濟南自封袋翹曲的辦法也有很多?？梢哉{整浮動輥張力，選用具有低溫熱封性的內封基材，將熱封溫度調整至適宜的溫度。要充分冷卻和熟化。重新選擇自封袋表層基材薄膜，調整復合加工設備各部分的張力，盡量使相復合的兩種基材回縮率相等。

There are many ways to solve the warpage of self sealing bags in Jinan. The tension of floating roller can be adjusted, and the inner sealing base material with low temperature heat sealing property can be selected to adjust the heat sealing temperature to the appropriate temperature. Cooling and ripening should be sufficient. Re select the substrate film on the surface of the self sealing bag, adjust the tension of each part of the composite processing equipment, and try to make the shrinkage ratio of the two composite substrates equal.