Cling film is a commonly used packaging material for fresh food, with moderate oxygen permeability and moisture permeability, regulating the oxygen content and moisture content around the preserved products, blocking dust in the air, thus extending the freshness period of the food. pvc cling film has the characteristics of high and low temperature resistance, and transparency, tensile and viscous, easy to use, cheap products, is widely used in fresh food packaging, has become an integral part of people's daily life. It has become an inseparable part of people's daily life.