Polyolefin Shrink Film production process is interesting. When we want to prove that a thing has a physical change because of the cold and heat of the temperature, we often say expansion and contraction. But it seems that the production process of Polyolefin Film goes against the theorem.
In the process of POF shrink film production, it is stretched and cooled rapidly in the high temperature environment, so as to achieve the goal of stereotyping. When it is heated, it is retracted to its original appearance, and the heat is uneven, and the degree and scope of the contraction are not the same.
The production of shrink film should produce thick film by extrusion blow molding or extrusion casting, then soften it at melting temperature and make transverse and longitudinal stretching.
When using polyolefin shrink film, it only needs to be heated at the melting temperature to reach the retracted and covered packaging product.