Novel PE film

Abstract

The invention discloses a novel PE film which is formed by coextrusion of three layerswhich are respectively an outer layer, a middle layer and an inner layer; thickness ratio among the outer layer, the middle layer and the inner layer is 1 plus/minus 0.3 : 1 plus/minus 0.3 : 1 plus/minus 0.3; raw materials of the outer layer are low-density polythene and linear low-density polythene with weight ratio of 1 : 1 to 1 : 8; raw materials of the middle layer are polypropylene and metallocene linear low-density polythene with weight ratio of 1 : 0.2 to 1 : 10; and raw materials of the inner layer are the linear low-density polythene, the metallocene linear low-density polythene and anti-block agent with weight ratio of 100 : 100 : 2to 100 : 10 : 1. The novel PE film has the advantages that modification is carried out on the middle layer by the polypropylene, the film has favorable heat sealing performance by adding the metallocene linear low-density polythene into the middle layer and the inner layer to cause molecules of the PE film after the modification to interlink to form a space stereo formation, and the molecule density is increased, thereby the purpose of preventing oil molecules from permeating is achieved, and the PE film is enabled to have favorable oil separation function.

Description

Technical field [0001] The invention relates to a PE film. Background technique [0002] PE film is generally co-extruded by three layers of outer layer, middle layer and inner layer. Because PE film has soft, transparent and good heat-seal performance, PE film has been widely used in composite food packaging bags, but it is widely used in composite food packaging bags. In the process, the molecular chain of ordinary PE film is linear and the density is low. Oil molecules can easily penetrate through the PE film from one side of the film to the other, resulting in poor oil barrier properties. If used for packaging oily food (such as Instant noodle oil package) can easily lead to the problem of edible oil penetrating the outer surface of the packaging bag. On the one hand, it affects the appearance of the product and reduces consumers' desire to buy; on the other hand, the oil penetration reduces the shelf life of food. Summary of the invention [0003] The purpose of the present...

AI Technical Summary

Problems solved by technology

[0002] PE film is generally co-extruded by three layers of outer layer, middle layer and inner layer. Because PE film has softness, transparency and good heat sealing performance, PE film has been widely used in composite food packaging bags, but in use During the process, the molecular chain of ordinary PE film is in a linear state and its density is low. Oil molecules can easily penetrate through the PE film from one side of the film to the other, resulting in poor oil separation performance. If it is used to package oily foods (such as Instant noodle oil pack) can easily lead to the problem of edible oil permeating the outer surface of the packaging bag. On the one hand, it affects the appearance of the product and reduces consumers' desire to buy; on the other hand, due to the penetration of oil, the shelf life of food is shortened.