When the thickness of the stretch film itself is relatively large, it is more difficult to apply, especially the stretched film by hand, which will reduce the working efficiency of the stretched film. Thicker stretch films have lower viscosity. The viscosity of the stretch film is determined by its own characteristics, and in the production, the excessively thick stretch film formed by adding plasticizers has different requirements in the specific production process, and also in the production formula. To be changed, this will reduce the self-adhesion of the stretched film and reduce its overall quality. Of course, by increasing the thickness of the stretch film, the mechanical properties of the stretch film are sacrificed, but the safety factor of the initial protective layer of the stretch film will be significantly enhanced, and the thick packaging will fully guarantee the safety of the product.