The development of plastic films

Shrink packaging is a packaging method that uses plastic film with heat shrinkable film performance to wrap the product, and then quickly do heat treatment, and the packaging film shrinks by itself according to a certain proportion and adheres to the packaged product.

Plastic film manufacturers will reveal the principle of heat shrinkable film for you: shrink film is made by pre-stretching technology and quenching process, which must have a certain rate of uniaxial or biaxial stretching, retain the directional molecular structure at the same time, but also retain the internal stress generated during tensile deformation. When used with heat, the internal stress elasticity of the "memory" is restored, thus returning to the natural curl state.

Shrink wrap started in the mid-60s and developed rapidly in the 70s. At present, plastic film has been widely used in some economically developed countries, according to statistics, Europe, the United States, Japan and other countries consume more than 100,000 tons of shrink film every year, Sweden has 30% of the circulation of packaging from carton packaging to shrink film packaging, and there is now a certain scale of application in China.