1.For the control of viscosity, if the stretch film has a good viscosity, it can make the film and film, and other objects together, packaging will good , no need additional heat sealing, strapping and other treatment, if the viscosity is poor , It affects the packaging effect, but the viscosity can not be too large, or will difficult to open, affect the packaging effect.

2.The control of the physical and mechanical properties of stretch film mainly for its high elongation, high yield point, and high transparency requirements, so stretch film can maintain a good stretch, more tightly packed and conducive to Product identification, packaging quality and appearance are good.

Stretch flim production procedure