Paper-plastic-aluminum package material used for boiling-resistant sterilization technology as well as preparation method thereof

Abstract

The invention relates to a paper-plastic-aluminum package material used for boiling-resistant sterilization technology as well as a preparation method thereof. The packaging material has a six-layer composite structure, the package material comprises a polymer coating layer with high peeling intensity, a cardboard layer, a composite layer, an aluminium foil layer, a bonding layer and a polymer film heat-sealing layer with good heat resistance in order from outer to inner, and the polymer coating is a mixed coating layer of medium-density polyethylene resin and caking property polyethylene resin. The preparation method comprises the followings steps: the composite layer is extruded between the cardboard layer and the aluminium foil layer through an extruder; the bonding layer is extruded between the aluminium foil layer and the polymer film heat-sealing layer through the extruder; the polymer coating layer is extruded at the outside of the cardboard layer, so that an integral structure is formed by bonding. The method enhances the combination fastness of an external layer material and the cardboard, avoids disconnection of four angles after moulding of the paper-plastic-aluminum package material, the paper-plastic-aluminum package material has advantages of heat resistance and pin hole resistance, and the preparation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of paper-aluminum-plastic packaging materials, and in particular relates to a paper-aluminum-plastic packaging material suitable for a retort-resistant sterilization process and a preparation method thereof. Background technique [0002] At present, domestic high-temperature resistant retort packaging materials are mainly in the form of bags for customers to use. The structure of high-temperature retort bags has two layers, three layers, four layers or even more. Among them, the second layer is transparent plastic type, such as PET / CPP or OPA / CPP. The three-layer ones include transparent plastic / plastic types, such as PET / OPA / CPP, and opaque types containing aluminum foil, such as PET / AL / CPP, OPA / AL / CPP. The four-layer is opaque PET / AL / OPA / CPP with aluminum foil. This structure is a puncture-resistant, reinforced, large-capacity packaging bag. The more layers are mainly multi-layer co-extruded films for the...

AI Technical Summary

Problems solved by technology

[0003] And about the retort-resistant packaging container that paper aluminum-plastic packaging material is molded on the filling machine, the method described in prior art CN1571749A is to add plastic particles (PA, PET, EVOH, etc.) Aluminum foil cracking and sealing problems in materials

However, in the actual use of retort-resistant packaging containers based on paper-aluminum-plastic packaging, customers reported that the inner film of the paper-aluminum-plastic packaging material had pinholes after cooking and sterilization, which made the paper-aluminum-plastic packaging material prone to red dye penetration; After the material is formed, the four corners are easy to fall off, etc.

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