In the process of bag making,the contents may leak or deteriorate due to incomplete heat sealing.For this kind of situation,it is mainly caused by poor anti pollution heat sealing of the film or improper resin used for the inner sealing layer.
Countermeasures:The film with good anti pollution heat sealing property is used.Generally speaking,LDPE has medium anti pollution heat sealing property,EVA has good anti pollution heat sealing property when VA content is large,LDPE also has good anti pollution heat sealing property,and ionic resin and metallocene polymer have excellent anti pollution heat sealing property.
