The selection method of composite packaging bag material is as follows: 1. Surface material. Most of the non-heat-sealing materials are used, and materials with good heat resistance and small thermal deformation should be considered, such as BOPA, BOPET, BOPP, etc. 2. Inner layer material. That is, the heat-sealing material can be heat-sealed at a temperature 30 degrees lower than the heat-deformation temperature of the surface material. If the heat-deformation temperature difference between the surface material and the heat-sealing material is too small, it will bring difficulties to the temperature control of bag making because the temperature is low. , The sealing fastness is poor and cannot meet the requirements. In order to improve the sealing fastness, the temperature is raised. Because the thermal deformation temperature difference between the inner and outer layers is too small, the surface material is easily scalded. For the same heat-sealing material, its heat-sealing strength will increase as the thickness of the heat-sealing material increases. Therefore, the inner layer material of the back sealing bag and the stand-up bag should be more than 30C thick. If the inner layer material is too thin, it will affect the sealing of the finished bag. 3. Zipper. The zipper sealing strip with a lower heat-sealing temperature should be selected, generally 5~10 degrees lower than the heat-sealing temperature of the inner layer material. The heat-sealing temperature of the PE L-101 zipper sealing strip of YLTpacking Packaging Products Co., Ltd. 201 is about 10 degrees lower, which can be selected when making bags with different PE inner layer materials, so as to achieve the best state of heat sealing with the inner layer material.
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