Stretch Orientation Knowledge Of Stretch Wrapping Film

We use the products of stretch wrapping film manufacturers, which are suitable for the collective packaging and pallet packaging of various products.

The orientation in the production process of the stretched film mainly occurs in the process of longitudinal stretching and transverse stretching. After longitudinal stretching, the polymer chain is uniaxially oriented longitudinally, which greatly improves the longitudinal mechanical properties of the sheet, while Lateral performance is reduced. After further transverse drawing, the polymer chains are in a biaxially oriented state, so the performance of the PE stretch film can be comprehensively improved. However, during transverse stretching preheating and transverse stretching, the relaxation time of the molecular chain is shortened due to the increase of temperature, which is conducive to de-orientation, and the effect of transverse stretching force will reduce the degree of longitudinal orientation of the molecular chain to a certain extent. This results in a reduction in the longitudinal thermal shrinkage of the film.

In order to obtain an ideal reinforced film, the control of process parameters such as temperature, stretching ratio, and stretching speed is very important during the stretching orientation process of the stretched stretch film.