Anti-ultraviolet high-barrier transparent packaging film and production method thereof

Abstract

The invention relates to an anti-ultraviolet high-barrier transparent packaging film and a production method thereof. The packaging film sequentially comprises a co-extrusion PE (Polyethylene) film layer, an oil ink layer, a solvent-free adhesive layer and a co-extrusion high-barrier film layer from outside to inside. According to the anti-ultraviolet high-barrier transparent packaging film disclosed by the invention, by selecting formulas of all film layers and controlling the layer thickness, a liquid packaging film with excellent performance is obtained. The packaging film disclosed by theinvention is low in production cost, has less equipment investment, simple in process, good in transparency and convenient for showing packaging contents. In addition, the packaging film disclosed bythe invention has the advantages of high barrier property, high ultraviolet resistance, strong compounding fastness, easiness for packaging molding, high food security and the like.

Description

technical field [0001] The invention belongs to the technical field of packaging films, and in particular relates to an ultraviolet-resistant high-barrier transparent packaging film and a production method thereof. Background technique [0002] With the development of the dairy industry, people pay more and more attention to the packaging of dairy products, especially the packaging of liquid milk that is convenient to drink. At present, there are mainly two types of packaging in the market: "Tetra Pak" and "Bailey". Among them, the film material of "Tetra Pak" packaging is a composite film made of paper, aluminum and plastic, and the film material of "Bailey Pack" packaging is a multi-layer co-extruded black and white film, that is, the printing surface of the film is white, and the heat cover is black. . A common problem in these two liquid milk packaging materials is that the content cannot be displayed, and the end user cannot see the milk in the content. In addition, t...

AI Technical Summary

Problems solved by technology

A common problem with these two liquid milk packaging materials is that the content cannot be displayed, and the end user cannot see the milk content.

In addition, the paper-aluminum-plastic composite material of "Tetra Pak" has great limitations in the use of packaging equipment, the cost of composite film materials is high, and waste recycling is difficult; the addition of "Tetra Pak" black masterbatch has food safety hazards, and the single There is a risk of contamination of the printed ink side of the film on the side in contact with milk

In view of the above problems, the prior art proposes a coating process transparent film, the film layer material structure is: three-layer co-extrusion PE / coating PVA / ink / glue / three-layer co-extrusion PE, but this transparent film exists Disadvantages: The compactness of liquid PVA coating film is not good, and PVA is easy to be affected by moisture to reduce the barrier property; the composite peeling fastness is not good, and there is delamination during sterilization treatment; the peeling fastness is not enough, resulting in low hot cutting strength, There is a risk of package breakage of packaged products during transportation

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