Five-layer co-extrusion uniaxial stretching PE film and preparation method thereof

Through the combination of five-layer coextrusion blow molding technology and specific materials, a one-way tensile PE film with high strength, high rigidity and low shrinkage rate was prepared, which solved the problems of low tensile strength and high shrinkage rate of existing PE films and achieved a wider packaging function.

CN119704825APending Publication Date: 2025-03-28SICHUAN MEIFENG CHEM IND +1
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Patent Information

Application Number
CN202411965943.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing PE film has low tensile strength, soft material texture and high shrinkage, which makes it only participate as a heat sealing layer in the packaging structure and cannot provide more functional structures.

Method used

Using five-layer coextrusion blow molding technology, a high-strength, high-rigidity, low-shrinkage unidirectional tensile PE film is prepared by coextrusion of the inner layer, sub-inner, medium, sub-outer and outer layer five-layer film, using materials such as high-density polyethylene and metallocene linear polyethylene, combined with preheating, stretching, annealing and cooling steps, a unidirectional tensile PE film with high strength, high rigidity, and low shrinkage rate is prepared.

Benefits of technology

The ultra-high longitudinal tensile strength and rigidity of the PE film are achieved, while reducing the heat shrinkage rate, meeting the needs of printing and coating, and giving the PE film more functionality.

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Abstract

The invention relates to the technical field of five-layer co-extrusion blow molding products, and discloses a five-layer co-extrusion one-way stretching PE film and a preparation method thereof, and the five-layer co-extrusion one-way stretching PE film is prepared by co-extrusion blow molding of five layers of films including an inner layer, a secondary inner layer, a middle layer, a secondary outer layer and an outer layer; the middle layer is prepared from the following raw materials in parts by weight: 69 parts of medium density polyethylene, 30 parts of metallocene linear polyethylene and 1 part of a processing aid; the secondary inner layer and the secondary outer layer are prepared from the following raw materials in parts by weight: 79 parts of high-density polyethylene, 20 parts of metallocene linear polyethylene and 1 part of a processing aid; the inner layer is prepared from the following raw materials in parts by weight: 84 parts of high-density polyethylene, 15 parts of metallocene medium-density polyethylene and 1 part of processing aid. According to the five-layer co-extrusion one-way stretching PE film with high strength, high rigidity and low shrinkage rate and the preparation method thereof, the five-layer co-extrusion one-way stretching PE film has ultrahigh longitudinal tensile strength and rigidity, meanwhile, the lower thermal shrinkage rate can meet the requirements of printing and coating at the same time, and by means of the mode, the PE film is endowed with more functionality.
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