Film with high drawing ratio and production method thereof

Abstract

The invention discloses a film with a high drawing ratio. The film is composed of an outer layer, an intermediate layer and an inner layer. The outer layer is a metallocene linear low density polyethylene and ethylene modified polyethylene glycol terephthalate blending modified resin; the intermediate layer comprises the compositions of maleic anhydride grafted low density polyethylene and graphene oxide modified low density polyethylene; and the inner layer is polyamide-11 or polyamide-12. The invention also discloses a production method of the film with the high drawing ratio. Compared withthe prior art, the packaging film has the advantages of high drawing ratio, low cost, good comprehensive performance, strong market competitive strength and the like. The invention also discloses theproduction method of the film with the high drawing ratio.

Description

technical field [0001] The invention relates to the technical field of films, in particular to a film with a high draw ratio and a production method thereof. Background technique [0002] The types of film include single-layer film, composite film and co-extrusion film. The disadvantages of single-layer film such as low mechanical strength and surface hardness, flammability and poor heat resistance limit its application range, and the market for co-extrusion film is relatively broad. Among them, the multi-layer co-extrusion technology is to use more than 3 extruders to melt and extrude resin materials with different functions, such as PA, PE, PP, etc. Bulge forming, cooling and compounding to make multi-layer composite film. [0003] The film produced by the multi-layer co-extrusion method can well meet the needs of various industrial packaging, and has the incomparable advantages of the dry composite film. By adjusting the thickness of each layer and using a variety of dif...

AI Technical Summary

Problems solved by technology

[0005] With the development of industrial automation, more and more large companies are switching from worker packaging and traditional semi-automatic packaging to fully automatic packaging lines. However, the traditional stretch film has low stretching ratio and poor fracture resistance, which cannot meet this high-speed packaging. High tensile automatic packaging equipment

For example, the Chinese patent application number CN201610617646.3 discloses a high-stretch heat-resistant PVC film formula. The film adopts a single-layer structure, and the main material is PVC. Salt, has good heat resistance, but the added inorganic salt cannot be tightly combined with the film at the molecular level, and it is easy to cause local fracture of the film during the high-speed stretching process of the automatic packaging equipment