Pure PE three-layer plastic film, corner angle packaging bag prepared therefrom, and production method of the film

Abstract

The invention relates to the technical field of plastic film manufacture, and specifically relates to a pure PE three-layer plastic film. The film comprises an outer layer, a middle layer, and an inner layer; wherein the outer layer is composed of the following raw materials in percentage by weight: 78 to 90% of metallocene, 6 to 15% of low density polyethylene, 3 to 5.5% of high density polyethylene, and 0.8 to 3.2% of slipping agent; the middle layer is composed of the following raw materials in percentage by weight: 70 to 85% of metallocene, 12 to 25% of low density polyethylene, 2 to 5% of high density polyethylene, and 0.8 to 2.5% of slipping agent; and the inner layer is composed of the following raw materials in percentage by weight: 70 to 85% of metallocene, 12 to 25% of low density polyethylene, and 1 to 5% of slipping agent. On the premise that the hardness and strength of plastic film are not influenced, the corner heat-seal distances of a packaging bag made of the PE three-layer plastic film in four corners can be controlled within 5 millimeters, thus the shortage of conventional PE industry is overcome; the four-edge sealed bag has not been applied to the PE industry yet and is mostly applied to the field of composite films; the production technology is simplified, and the packaging cost of composite film factories is greatly reduced on the basis that the beautiful appearance of external package bag is not influenced.

Description

[technical field] [0001] The invention relates to the technical field of plastic film manufacture, in particular to a pure PE three-layer plastic film, an angular packaging bag prepared therefrom and a production method thereof. [Background technique] [0002] The production process of plastic film is: after the resin material supplied from the hopper to the cylinder is heated and melted by the heater, the PE resin is continuously extruded from the screw to the crosshead and the die to form a film shape. At present, when pure PE plastic particles are used and blown into a plastic film, the film is very soft when used as a product outer packaging bag. Moreover, the packaging bag does not have edges and corners when folded, and the appearance is not beautiful. The angular and beautiful product plastic packaging bags seen on the market are all made of composite plastic films (such as: CPP and PE composites, etc.). From the processing point of view, composite products use adhesi...

AI Technical Summary

Problems solved by technology

At present, when pure PE plastic particles are used to blow mold plastic films into product outer packaging bags, the films are very soft, and the packaging bags will not have edges and corners when folded, and the appearance is not beautiful.

The angular and beautiful plastic packaging bags seen on the market are all made of composite plastic films (such as: CPP and PE composites, etc.). From the processing point of view, composite products use adhesives, which are costly and more expensive. Not environmentally friendly, when using pure PE plastic packaging bags, there will be adhesion phenomenon during external heat sealing during heat sealing, which will affect the appearance