Ordinary PET is a crystalline polymer. After the PET film is stretched and oriented, it will produce a large degree of crystallization. If it is heat sealed, it will produce shrinkage deformation. Therefore, ordinary PET film does not have heat sealing performance. When PET film is used as commodity packaging, in order to solve its heat sealing problem, the method of combining BOPET film with PE film or CPP film is usually adopted, which limits the application of BOPET film to a certain extent.
In order to solve the problem of heat sealing, through the modification of PET resin and the use of A/B/C three-layer die, a three-layer co-extruded heat sealing PET film has been developed. Because one side of this heat sealing PET film is a heat sealing layer, it can be directly heat sealed, which is very convenient to use.
The heat-sealed PET film can be widely used in the fields of packaging and card protection film of various commodities.