Extensible aluminum foil-containing high temperature boiling composite film and making method thereof

Abstract

The invention discloses an extensible aluminum foil-containing high temperature boiling composite film. The composite film with a three-layer structure sequentially comprises a PET layer, an ink layer, an AL layer and an RCPP layer from the surface layer to the inner layer, and the ink layer, the AL layer and the RCPP layer are bonded and compounded through glue to form the integral film structure. The integral packing appearance effect and the designed performances of the composite film are subjected to very little adverse influence in the automatic molding packaging and high temperature sterilizing process, so clients' requirements are met; and local and integral stretching of the composite film causes no cracks or factures of aluminum foil, no shell loosening or layer isolation of all layers, flat and regular surface and complete pattern content, and complete bag shape, no obvious deformation, no bag breaking, no layer isolation, no corner warping, no edge warping and no pattern discoloration are realized after 121 DEG C high temperature boiling for 40 min or 135 DEG C boiling for 5 min of the product used in packaging.

Description

technical field [0001] The invention relates to a cooking composite film, which belongs to the technical field of packaging films, in particular to a high-temperature cooking composite film which can be extended and contains aluminum foil and a manufacturing method thereof. Background technique [0002] The high-temperature cooking packaging film used in the food market now has a three-layer structure or a four-layer structure. Each layer has different materials and functions. The outer layer is mainly a substrate, which can be printed with text and pattern information, and has a certain durability. Friction function, good gloss and certain protective effect, the middle layer mainly improves the barrier properties of the overall structure (light blocking, water blocking, oxygen blocking), the inner layer is a heat sealing layer, which mainly plays a role in heat sealing and improving the bag The role of softness and barrier properties. The current process is generally to pr...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, in the production of flexible packaging composite films, the barrier properties of products containing metal aluminum foil are the best, but in the process of production or use, the existing technology often causes damage to the aluminum foil layer

Existing packaging cannot protect the shape of soft products, which is not beautiful; especially for high-temperature cooking composite films used in automatic packaging machines, aluminum foil is prone to appear during the partial stamping and overall stretching of the film during the packaging process. Layer cracking, separation from upper and lower layers, perforation, etc.

When boiled in high temperature water, it is very easy to cause ink separation, serious deformation of the bag or even bag breakage, and the packaging performance of the entire structural design of this packaging film will be lost.

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