What is the tensile coefficient of stretch film?

Stretch film has the same properties as rubber at room temperature, has certain wearability, and has a certain elasticity, high elongation, self-adhesiveness and stretchability, and is deeply loved by the packaging industry. Especially when transporting loose parts, only loose objects can be packaged, with long-lasting beam tightness, which is partly due to the tensile coefficient of the stretch film, which is the key to determining its performance and quality. So next, let's get to know each other.

The tensile coefficient of the stretch film is one of the main process parameters in the calculation of the stretching process and is usually used to determine the order and number of stretches. There are many factors that affect the tensile coefficient of the stretch film, including material properties, relative thickness of the material, stretching method (refers to whether there is a crimping ring), the number of deep drawings, the drawing speed, the corner radius of the punch and the die, lubrication, etc. The calculation and selection principle of the tensile coefficient of the stretch film is the focus of various stamping process manuals (with or without crimping rings). The relative thickness of the material, the stretching method (refers to whether there is a crimping ring), the number of pulling times is not easy to adjust during mold repair, you must be careful!