The products packed with PVC heat shrinkable films are not only beautiful and generous, but also save the packaging cost, and also have the performance of sealing, dustproof, moisture-proof and anti-theft.
PVC Shrink Film has so many functions, so how is it produced? The following coating online to explain the knowledge about the production of PVC heat-shrinkable film:
PVC Shrink Film
The PVC Heat Shrinkable Film is blow-moulded by a process of rapid cooling and shaping. The principle of shrinkage is the memory effect of the polymer. When the film is stretched under the temperature condition of glass transition temperature T g above and melting point T m below, The randomly curled molecular segments are oriented in the stretching direction and arranged in an orderly manner. At this time, the temperature is suddenly dropped suddenly, and the molecular segment orientation structure and internal stress are "frozen". When the polymer is heated again to the temperature at which it is stretched, the molecular segments are de-oriented, resulting in stress relaxation, returning to the disordered curl form, and macroscopically showing heat shrinkage.
PVC heat shrinkable film materials can not only reduce packaging costs, transportation costs, and packaging volume, but also have higher transparency and good printing performance. In a fiercely competitive market, it can quickly catch the eyes of consumers and cater to consumer needs.
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