Composite packaging film and preparation method thereof

By designing composite film materials with multi-layer structures, including polyethylene, ethylene-vinyl alcohol copolymer and cellulose hemicellulose, and using infrared preheating and annealing treatment during the preparation process, the problem that the prior art is difficult to meet higher barrier requirements is solved, and the excellent performance of composite film materials in barrier properties, moisture resistance, mechanical strength and environmental protection performance is achieved.

CN119704821AActive Publication Date: 2025-03-28JIANGYIN BAOBO NEW TYPE PACKAGING MATERIAL +1
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Patent Information

Application Number
CN202411877649.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-28
Estimated Expiration
2044-12-19

AI Technical Summary

Technical Problem

The existing high-barrier composite film materials are difficult to meet the higher barrier requirements below 0.5, especially in terms of barriers between oxygen and water vapor.

Method used

The composite film material design is designed with a multi-layer structure, including the inner layer, the intermediate layer and the outer layer. The inner layer is polyethylene, the intermediate layer is ethylene-vinyl alcohol copolymer, and the outer layer is polyethylene, cellulose and hemicellulose. The layers are composited by an adhesive, and infrared preheating and annealing are used during the preparation process to enhance the interlayer binding force.

Benefits of technology

It achieves the superior performance of composite film materials in barrier properties, moisture resistance, mechanical strength and environmental protection performance. It is suitable for oxygen-sensitive product packaging, while providing good physical protection and environmental protection.

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Abstract

The invention provides a composite membrane material which comprises an inner layer, a middle layer and an outer layer, and the inner layer comprises polyethylene; the middle layer comprises an ethylene-vinyl alcohol copolymer, and the middle layer at least partially covers the inner layer; the outer layer comprises polyethylene, cellulose and hemicellulose, and the outer layer at least partially covers the middle layer; wherein the inner layer and the middle layer are compounded through an adhesive, and the middle layer and the outer layer are compounded through an adhesive; and at least one middle layer is arranged. Through the design of a multi-layer structure, the composite film material shows excellent performance in the aspects of barrier property, moisture resistance, mechanical strength, environmental protection performance and the like, is not only suitable for packaging products sensitive to oxygen, but also can provide good physical protection, and meanwhile, meets the environmental protection requirement.
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