The key to material selection

Material selection.

1. The choice of packaging bag surface material
   
   To non-heat sealing materials for more, should consider the choice of heat resistance, heat deformation of small amount of material is appropriate, such as BOPA, BOPET, BOPP, paper, etc..
   
   
2. The inner layer material selection
   
   That is, heat sealing materials, to the surface layer of material heat deformation temperature 30 ℃ lower than the appropriate heat sealing, if the surface layer of material and heat sealing layer of material heat deformation temperature difference is too small, it will bring difficulties to the bag-making temperature control, because the temperature is low, sealing fastness is poor, can not meet the requirements, in order to improve the sealing fastness, the temperature will be increased, due to the heat deformation of the inner and outer layer of material temperature difference is too small, easy to the surface layer of material burns.
   
   For the same heat sealing material, its heat sealing strength will increase as the thickness of the heat sealing material increases. Therefore, back-sealed bags, stand-up pouches and its inner layer of material should be more than 30μm thickness is appropriate, if the inner layer of material is too thin, it will affect the sealing of the finished bag.
   
   
3. Zipper
   
   The zipper seal should be selected with a lower heat sealing temperature, generally better than the inner material can be heat sealed temperature 5 ~ 10 ℃ lower, such as PE L-101 zipper seal heat sealing temperature than its PE LL-201 about 10 ℃ lower, can be selected for different PE inner material bag making, in order to achieve the best state of heat sealing with the inner material.