Oxygen uptake type casting polypropylene high-temperature digestion film

Abstract

The invention discloses an oxygen uptake type casting polypropylene high-temperature digestion film which is characterized in that the film is of a three-layer structure and sequentially comprises anoxygen uptake layer (1), an intermediate layer (2) and a heat seal layer (3) from top to bottom, wherein the three-layer structure is prepared by a co-extruded casting process; the oxygen uptake layer(1) comprises 20-60% of a block copolymer polypropylene and 40-80% of an iron-containing oxygen uptake master batch; the intermediate layer (2) comprises 85-98% of a block copolymer polypropylene and2-15% of a polyolefin elastomer; the heat seal layer (3) comprises 78-96% of a block copolymer polypropylene, 2-15% of a polyolefin elastomer and 2-7% of a silicone smooth master batch; the ratio ismass percent; the thickness of the oxygen uptake layer (1) is more than 20 microns; the thickness ratio of the intermediate layer (2) to the heat seal layer (3) is (2-4):1.

Description

technical field [0001] The invention relates to the field of plastic films, in particular to an oxygen-absorbing cast polypropylene high-temperature cooking film. Background technique [0002] Oxygen is known to cause food spoilage. Therefore, in the process of food packaging, modified atmosphere packaging and vacuum packaging are widely used to remove oxygen in the packaging bag, but these traditional methods cannot completely remove oxygen, and there will still be a small amount of oxygen remaining in the packaging. In addition, it is impossible to completely eliminate the oxygen remaining in porous, powdered foods or dissolved in liquid substances during food processing. This part of oxygen will gradually escape from the food into the packaging bag, especially when cooking or heating In the environment, the escape of oxygen will also be accelerated; at the same time, during the storage process, oxygen will also seep into the packaging, which will increase the oxygen conc...

AI Technical Summary

Problems solved by technology

Therefore, in the process of food packaging, modified atmosphere packaging and vacuum packaging are widely used to remove oxygen in the packaging bag, but these traditional methods cannot completely remove oxygen, and there will still be a small amount of oxygen remaining in the packaging

In addition, it is impossible to completely eliminate the oxygen remaining in porous, powdered foods or dissolved in liquid substances during food processing. This part of oxygen will gradually escape from the food into the packaging bag, especially when cooking or heating In the environment, it will also accelerate the escape of oxygen; at the same time, during the storage process, oxygen will also seep into the packaging, which will increase the oxygen concentration in the packaging bag and affect the shelf life of the food.

[0003] The traditional solution is to add preservatives to food, although it is effective, but it will cause food safety hazards; or add a small bag of oxygen absorber in the packaging bag, although the effect is better than the former, it not only increases the packaging cost, There is also a risk of being swallowed

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