A kind of plastic preservative film used for kiwi fruit packaging and preparation method thereof

Abstract

The invention relates to the field of food fresh-keeping materials, and discloses a plastic fresh-keeping film for packaging kiwi fruits and a preparation method. The preparation method comprises thefollowing steps of (1) using an ethyl alcohol solution to wash polymethyl methacrylate microspheres, putting into a mixed solution of hydrogen peroxide and sulfuric acid, heating, adding into a polyvinylidene chloride emulsion, and stirring, so as to obtain a composite emulsion, wherein the raw materials comprise 10 to 20% of polymethyl methacrylate microspheres, 25 to 30% of polyvinylidene chloride, 1 to 2% of emulsifier, and 48 to 64% of water; (2) performing corona treatment on a nonwoven cloth, uniformly coating the composite emulsion, and drying; (3) using a laser device to radiate the coating layer of the non-woven cloth, so as to obtain the plastic fresh-keeping film. Compared with the traditional fresh-keeping film, the prepared plastic fresh-keeping film has the advantages that the permeation rate of carbon dioxide / oxygen is high, the concentration of carbon dioxide is low, the low-oxygen environment is well maintained, the atmosphere control effect is obvious, and the warranty period of the kiwi fruit is effectively prolonged; the preparation process is simple, the energy consumption is low, the cost is low, and the application prospect is broad.

Description

technical field [0001] The invention relates to the field of food preservation materials, and provides a plastic preservation film used for kiwi fruit packaging and a preparation method. Background technique [0002] Kiwifruit is the collective name for perennial plants of the genus Actinidia in the Actiniaceae family. It is also known as sheep fruit, kiwi fruit, kiwi pear, and pear. It is a perennial vine and an important fruit resource. Kiwifruit pulp is sweet and sour, nutritious, rich in vitamins, and has high health value, so it is also called "the king of VC". Kiwifruit also contains functional ingredients such as dietary fiber, polysaccharides, flavonoids, and polyphenols. Trace elements, calcium and magnesium have the highest content, followed by iron, copper, zinc, etc. In addition, kiwifruit also contains more than ten kinds of amino acids such as leucine and tyrosine. Kiwi fruit has high economic value and medicinal value for various diseases such as cardiovascul...

AI Technical Summary

Problems solved by technology

[0008] Due to the relatively low penetration of carbon dioxide and oxygen in kiwifruit plastic cling film, which is widely used at present, the concentration of carbon dioxide in the bag is relatively high, the low-oxygen environment is poor, kiwifruit is easy to rot and deteriorate, and the shelf life is short.

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