Oxygen-inhaling type casting polypropylene semi-cooked film

Abstract

The invention discloses an oxygen-inhaling type casting polypropylene semi-cooked film. The film is characterized by a three-layer structure, namely, an oxygen-inhaling layer (1), a middle layer (2) and a heat-sealing layer (3) in turn from top to bottom. The three-layer structure is prepared by adopting a co-extrusion casting process. The oxygen-inhaling layer (1) contains 20-60% of polypropylenerandom copolymer and 40-80% of iron-containing oxygen-inhaling master batch; the middle layer (2) contains 85-100% of polypropylene random copolymer and 0-15% of polyolefin elastomer; the heat-sealing layer (3) contains 81-99.5% of polypropylene random copolymer, 0-15% of polyolefin elastomer and 0.5-4% of smooth anti-blocking master batch; the above percent is weight percent; the thickness of oxygen-inhaling layer (1) is more than 20 microns; the thickness ratio of middle layer (2) to heat-sealing layer (3) is at (2-4):1.

Description

technical field [0001] The invention relates to the field of plastic films, in particular to an oxygen-absorbing cast polypropylene semi-cooked 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 concentration in ...

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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