High-barrier semi-high temperature cooking liquid packaging material and packaging bag made of the same

Abstract

The invention relates to a high-barrier semi-high temperature cooking liquid packaging material and a packaging bag made of the same. The high-barrier semi-high temperature cooking liquid packaging material is a composite membrane prepared by stacking a polyester film (PET) layer, an aluminum foil (Al) layer, a nylon (PA) layer and a polyethylene film (PE) layer from top to bottom by a dry compound machine. The PE layer is prepared by coextrusion blow molding on a surface layer, a middle layer and a heat seal layer; the surface layer is prepared by blending metallocene PE and LDPE in a weight ratio of 2-4:1; the middle layer is prepared by blending metallocene PE and LDPE in a weight ratio of 3-5:1, and adding ethylene propylene copolymer elastomer accounting for 10%-15% of the total weight of the middle layer; and the heat seal layer is prepared by blending metallocene PE and zinc neutralized ethylene copolymer in a weight ratio of 3-5:1. The invention employs a high quality material containing metallocene PE, which is added with a proper amount of an ethylene propylene copolymer elastomer, and especially the heat seal layer is added with the zinc neutralized ethylene copolymer; and the PE layer prepared through blow molding by a three-layer co-extrusion film blowing machine.

Description

technical field [0001] The invention relates to a packaging material, in particular to a high-barrier semi-high temperature cooking liquid packaging material and a packaging bag made thereof. Background technique [0002] The high-temperature retort bag is a packaging composite film material successfully developed by the U.S. Navy Research Institute in the 1960s to solve astronaut food. However, high-temperature retort bags did not develop in the United States and European countries. Later, they were introduced to Japan, but they were rapidly developed and widely used in Japan with an annual growth rate of 15%. Foods packaged in high-temperature retort bags have developed from dozens of types in the 1960s to hundreds of foods in the 1970s, and more than 800 types of foods packaged in high-temperature retort bags in the 1990s, including solid, liquid, and slurry and other food. The weight of the packaging has developed from the original small package of 200g to 500g / piece t...

AI Technical Summary

Problems solved by technology

Juice liquid packaging bags need to meet the above requirements. At present, the large-scale juice liquid packaging in the general market basically uses plastic bottles, which is expensive. The bottle body takes up a lot of space and is easily deformed, which is extremely inconvenient.

With the continuous development of packaging technology, juice packaging bags are more and more widely used, generally using polyester film / aluminum foil / nylon / cast polypropylene film or high-temperature cooking polyethylene film [PET / AL / PA / RCPP (or high-temperature cooking PE)] composite packaging bag, the structure can meet the high-temperature cooking sterilization requirements, but because RCPP (or high-temperature cooking PE) itself is brittle, not resistant to falling and poor sealing anti-pollution, it can only be used for small liquid packaging , not suitable for large (more than 2kg) fruit juice liquid packaging

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