High-barrier transparent composite packaging film applicable to boiling sterilization process

Abstract

The invention provides a high-barrier transparent composite packaging film applicable to a boiling sterilization process. The composite packaging film is successively provided with, from exterior to interior, an outer printing layer, an intermediate barrier layer and an inner heat sealing layer, wherein the layers are bonded together by a polyurethane adhesive, the outer printing layer is a bisynchronously drawing nylon film, the intermediate barrier layer is a polyester film coated with polyvinylidene chloride emulsion, and the inner heat sealing layer is a boiling-grade casting polypropylene film. The high-barrier transparent composite packaging film applicable to the boiling sterilization process meets requirements of the process for sterilizing food by boiling at 121 DEG C for 30 min, can effectively overcome the problems that a conventional high-barrier composite packaging film is non-transparent and aluminum foils easily fracture when the conventional high-barrier composite packaging film and aluminum foil soft-plastic packaging bags are subjected to vacuum-pumping packaging, and has the characteristic of a three-layer composite structure; and the high-barrier transparent composite packaging film has good transparency, puncture resistance and mechanical strength and has high barrier performance which is equivalent to high barrier performance of a plastic-aluminum composite film.

Description

technical field [0001] The invention relates to an improvement of a composite packaging film, in particular to a high-barrier transparent composite packaging film suitable for cooking and sterilization processes. Background technique [0002] At present, most of the high-barrier packaging films on the market are made of aluminum foil as the barrier material, and its product structure is a composite of three or more layers. Due to the characteristics of metal materials, this type of flexible plastic packaging composite film has excellent barrier properties ( Oxygen transmission rate, water transmission rate), and aluminum foil composite packaging film can meet the sterilization requirements of boiling and steaming in the processing technology of food enterprises, and is also the most commonly used packaging form in high barrier food packaging. However, this material packaging has the following problems: 1. It cannot be transparent, which is not conducive to the display of pro...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a high-barrier transparent composite packaging film suitable for the cooking and sterilization process, which can meet the food sterilization process of cooking at 121°C for 30 minutes, and can effectively overcome the opacity problem of the existing high-barrier packaging film and the aluminum foil soft plastic packaging bag. Vacuum packaging is prone to breakage of aluminum foil. It has the characteristics of three-layer composite structure, good transparency, puncture resistance and mechanical strength, and its high barrier performance is equivalent to that of aluminum-plastic composite film.

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