On the one hand, the density of the material affects the performance of the stretch film. As the density increases, the orientation degree increases, the flatness is good, the longitudinal elongation of the stretch film increases, and the yield strength increases. However, this results in a decrease in the transverse tear strength, puncture strength, and transmittance of the stretch film. Therefore, taking into account all aspects of performance, an appropriate amount of medium density linear polyethylene is often added to the non adhesive layer. On the other hand, as the temperature of the cooling roller increases, the yield strength increases, but the tensile film performance decreases. Therefore, it is generally better to control the temperature of the cooling I roller at 20-30 degrees Celsius.

The tension of the stretch film is generally not greater than 10kg, and if the stress is too large, it will remain in the film roll, resulting in a decrease in elongation and other properties, which can easily cause film breakage.