High-barrier paper-plastic composite packaging film

Abstract

The invention relates to a high-barrier paper-plastic composite packaging film which comprises an aluminizing casting polypropylene film layer, wherein the aluminizing casting polypropylene film layer is compounded on a paper layer; the aluminizing casting polypropylene film layer comprises a corona layer, a middle layer and a thermal sealing layer which are compounded together; the surface of the corona layer is plated with an aluminum layer; the layer thickness ratio of the corona layer, the middle layer and the thermal sealing layer is (2.8-3.2):(20.5-21.5):(5.7-6.3); the corona layer comprises a cycloalkene copolymer; the middle layer comprises homo-polypropylene with a nucleating agent; the thermal sealing layer comprises a ternary polymerization co-polypropylene material I and a ternary polymerization co-polypropylene material II in a mass ratio of (0.9-1.1):(0.9-1.1). The high-barrier paper-plastic composite packaging film provided by the invention has high barrier performance, is capable of successfully solving the problem that the barrier property is degraded after a paper-plastic composite packaging film passes through packaging equipment, and is stable in barrier property and applicable to various filling packaging modes.

Description

technical field [0001] The invention belongs to the technical field of paper-plastic composite packaging film, and in particular relates to a high-barrier paper-plastic composite packaging film. Background technique [0002] Paper-plastic composite packaging film is usually composed of plastic and paper. It is widely used in flexible packaging materials. However, due to the special surface of paper, it has a high friction coefficient on vertical packaging equipment, especially at the folded collar, resulting in paper The barrier property of the plastic composite packaging film is greatly reduced. Generally, the permeability of the paper plastic composite packaging film will increase by 3-5 times before and after packaging. The existing paper-plastic composite packaging film mainly uses VMPET or aluminum foil as the barrier layer of the paper-plastic composite packaging film, but under the large friction of the packaging, the paper-plastic composite packaging film will appear...

AI Technical Summary

Problems solved by technology

[0002] Paper-plastic composite packaging film is usually composed of plastic and paper. It is widely used in flexible packaging materials. However, due to the special surface of paper, it has a high friction coefficient on vertical packaging equipment, especially at the folded collar, resulting in paper The barrier property of the plastic composite packaging film is greatly reduced. Generally, the permeability of the paper plastic composite packaging film will increase by 3-5 times before and after packaging.

The existing paper-plastic composite packaging film mainly uses VMPET or aluminum foil as the barrier layer of the paper-plastic composite packaging film, but under the large friction of the packaging, the paper-plastic composite packaging film will appear microscopic cracking deformation, while the paper-plastic composite packaging film The barrier property of plastic composite packaging film can be significantly affected by microscopic deformation, such as VMPET and micro cracks in aluminum foil will increase the moisture permeability and oxygen permeability parameters of paper plastic composite packaging film

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