The effect of PE heat shrinkable film

The products of PE heat-shrinkable film manufacturers use the principle of the stretching direction of polymer molecular chains and are formed by quenching and setting. The physical principle is that when in a highly elastic state, grasp the stretching direction of the high polymer, and then suddenly cool the high polymer below the glass transition temperature, the molecular orientation freezes, and then rises to a certain temperature, the molecular movement will cause stress relief. The molecule returns to its original state, causing contraction. Heat shrinkable film is a kind of thermoplastic film, stretched during the production process, and shrinks to heat during use. Therefore, no matter which printing method is used, before designing the surface pattern, the horizontal and vertical shrinkage of the material and the allowable deformation errors in all directions of the decorative painting must be considered. It can ensure the accurate restoration of the shrinking pattern, text and barcode in the container. The transverse shrinkage rate of the heat shrinkable film material used for printing varies between 50% to 52% and 60% to ~62%. In special cases, it needs 90% and the longitudinal shrinkage rate is about 6%. . Next: Understand the maintenance effect of polymer protective filmPrevious: Technical characteristics of heat shrinkable film