High-light-shading high-barrier liquid package film and production method thereof

Abstract

The invention relates to a high-light-shading high-barrier liquid package film and a production method thereof. The package film comprises a milky white mat PE co-extrusion film layer, an EAA extrusion composite film layer, an aluminium layer and an EVOH co-extrusion film layer in sequence from outside to inside. According to the high-light-shading high-barrier liquid package film and the production method thereof, the liquid package film with excellent performance is obtained by selecting the formulae of various film layers and controlling the layer thickness. The package film provided by theinvention is low in production cost, low in equipment investment and simple in process, and has a very good light shading effect; the barrier property of the high-light-shading high-barrier liquid package film is better than that of a PrePak and is close to that of a tetra pack, and the barrier property of the high-light-shading high-barrier liquid package film is better than that of the tetra pack after being kneaded. Waste materials of a package film material are convenient to recycle; the packaging film is packaged and formed without limitation, can be formed by hot cutting and can also beformed thermally; the appearance of the package film material has a milky white mat effect and has high sensory quality.

Description

technical field [0001] The invention belongs to the technical field of packaging film materials, and in particular relates to a high light-shielding and high-barrier liquid 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 the "Tetra Pak" package is a composite film made of paper, aluminum and plastic, and the film material of the "Bailey Pack" package is a multi-layer co-extruded black and white film. 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 black masterbatch in "Tetra Pak...

AI Technical Summary

Problems solved by technology

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 black masterbatch in "Tetra Pak" has food safety hazards

In view of the above problems, the prior art proposes a plastic-plastic composite film, the material structure of which is: ink / three-layer co-extrusion PE / coating PVA / glue / three-layer co-extrusion VMPE, although the production cost of the composite film is low , less investment in equipment, simple process, but there are disadvantages: the compactness of liquid PVA coating film is not good, PVA is easy to be affected by moisture to reduce the barrier property; the composite stripping fastness is not good, and there is delamination during sterilization treatment; The destruction of the aluminum layer leads to poor barrier properties; insufficient peel fastness leads to low shear strength, and there is a risk of package breakage when the packaged product is transported and flowed

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