Packaging material and packaging container

Abstract

Described herein are laminated packaging materials comprising foamed cellulose, their use in manufacturing packaging containers, for use in packaging of food products.

Description

technical field [0001] This document describes packaging materials for packaging containers for liquid or semi-liquid food products, their production methods and uses. Background technique [0002] Packaging containers of the disposable type for liquid food products are usually produced from cardboard or cardboard based packaging materials. One such common packaging container is Tetra Sold under the Aseptic trademark, it is mainly used for aseptic packaging of liquid food products (such as milk, juice, etc.) that are marketed and sold under long-term ambient storage conditions. The packaging material in such known packaging containers is generally a laminate comprising a body layer of paper or cardboard and an outer liquid-tight layer formed of thermoplastic. In order to make packaging containers airtight, in particular oxygen-tight, for example for the purpose of aseptic packaging, such as the packaging of milk or fruit juices, the packaging material laminate in these pa...

AI Technical Summary

Problems solved by technology

However, such attempts have not led to actual products because foams made from cost-effective polymers often deteriorate and collapse when exposed to high temperatures and pressures during the conversion of the materials into laminates

This is a particular problem during polymer melt extrusion lamination operations, where the polymer foam collapses due to the heat of the molten polymer and the pressure of the lamination nip, and during the lamination step, where thermoplastic polymers or The layers of the pre-coated surface of the adhesive are adhered to each other by the simultaneous application of heat and pressure in a heated nip (so-called rotary thermocompression lamination)

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