Jinan self sealing bag is made of LDPE and LLDPE by blow molding and hot cutting machine bag, which can be sealed repeatedly. Self sealing bag can be used for inner and outer packaging of various small items. The self sealing bag made of food grade raw materials can store all kinds of small food, tea, seafood, etc., moisture-proof, water-proof, insect proof and prevent things from scattering.

濟(jì)南自封袋熱封后袋子出現(xiàn)翹曲的原因可能是復(fù)合膜的厚度不一致，熱封溫度過高或熱封時(shí)間過長，在縱向熱封刀部分，復(fù)合膜的運(yùn)行軌跡不平直?；蛘呃鋮s與熟化時(shí)間不夠充分，表層基材薄膜耐熱性較差。復(fù)合過程中復(fù)合基材的張力匹配控制不當(dāng)，導(dǎo)致濟(jì)南自封袋熟化定型后仍有殘余的應(yīng)力，尤其是復(fù)合膜厚度較薄時(shí)更容易發(fā)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 curing time is not enough, the heat resistance of surface substrate film is poor. In the process of lamination, the tension matching of composite substrate is not well controlled, 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(jì)南自封袋翹曲的辦法也有很多?？梢哉{(diào)整浮動輥張力，選用具有低溫?zé)岱庑缘膬?nèi)封基材，將熱封溫度調(diào)整適宜的溫度。要充分冷卻和熟化。重新選擇自封袋表層基材薄膜，調(diào)整復(fù)合加工設(shè)備各部分的張力，盡量使相復(fù)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. It can adjust the tension of the floating roller, select the inner sealing substrate with low temperature heat sealing property, and adjust the heat sealing temperature to the appropriate temperature. Cooling and ripening should be sufficient. Re select the surface substrate film of the self sealing bag, adjust the tension of each part of the composite processing equipment, and try to make the shrinkage of the two composite substrates equal.