The characteristics of heat shrink film is obvious

PVC heat shrink film is stretched, cooled and molded (as long as it is not heat-set) after preheating. The resin casting sheet is stretched horizontally and longitudinally at TF close to the PVC resin, and then quenched so that the resin molecular chains are frozen in an oriented state to form the heat shrink film. From raw material to the formation of heat shrinkable film is a process of entropy decrease, and the thermodynamic state of heat shrinkable film is unstable. When the shrinkable film is heat-treated, the oriented molecular chains will rapidly return to the randomly curled state and the film shrinks.

However, the effects of longitudinal and transverse shrinkage of the film are different. Too much longitudinal shrinkage tends to wrinkle PVC films. Only PVC heat shrink film with large transverse shrinkage and small longitudinal shrinkage remain relatively smooth and wrinkle-free.

The characteristics of heat-shrinkable film are very obvious. First, it is highly flexible and not easily damaged. It has strong explosion-proof and certain impact resistance. PVC heat shrink film because of these characteristics that people use it to package goods that have just been produced. In fact, they make a protective film for the goods to better protect the appearance of the goods from damage and enhance the customer's impression.