How is PVC heat shrink film produced?

PVC heat shrink film packaging products are not only beautiful and generous, saving packaging costs, but also has the performance of sealing, dust, moisture and anti-theft.PVC heat shrink film so many functions, then how is it produced? The following for you to explain the knowledge about the production of PVC shrink film:

PVC heat shrink film is used in the process of rapid cooling and shaping method of blow molding, the contraction principle for the polymer memory effect, is the film in the glass transition temperature T g above, melting point T m below the temperature conditions of stretching, disordered curled molecular chain segments in the direction of stretching direction orientation, orderly arrangement, then the temperature will be a sharp drop in the temperature, the molecular chain segments of the orientation of the structure and the internal stress was “frozen”. When the polymer is heated again to the temperature when being stretched, the molecular chain segments occur de-orientation, resulting in stress relaxation, restored to the disordered curl form, the macro that is manifested as heat shrinkage.

PVC heat shrink film material can not only reduce the cost of packaging, transportation costs, reduce the volume of packaging, but also has a high degree of transparency, good printing performance. The competitive market can quickly catch the eyes of consumers, catering to consumer demand.