Preservative film for vegetables and fruits and production process of preservative film

Abstract

The invention provides a preservative film for vegetables and fruits. The preservative film comprises a film body, wherein the film body comprises at least three layers of structures and is longitudinally provided with at least one reinforcing bar, a plurality of incisions are formed in two sides of the reinforcing bar and penetrate through the film body; the film body contains the following raw materials in parts by weight: 50-60 parts of polytetrafluoroethylene particles, 50-60 parts of polypropylene particles, 10-20 parts of polyethylene particles, 10-20 parts of poly-p-phenylene terephthamide, 1-5 parts of phosphite ester powder and 1-5 parts of sodium alginate powder. The invention further provides a production process of the preservative film. The preservative film is formed by virtue of multi-layer coextrusion, a closed structure of the preservative film in the past is changed, the vegetables and the fruits in a package are in communication with external gas and moisture, and gas and moisture generated by the vegetables and the fruits are discharged, so that the preservation periods of the vegetables and the fruits are prolonged.

Description

technical field [0001] The invention relates to the field of plastic films, in particular to a fresh-keeping film for fruits and vegetables and a production process thereof. Background technique [0002] Fruits and vegetables include fruits and vegetables. In addition to being beneficial to human health, fruits and vegetables contain various organic acids, aromatic substances and various pigment components, which are also important for mediating people's tastes. The main components of fruits and vegetables include carbohydrates (sugar starch, cellulose, pectin, etc.), organic acids (malic acid, citric acid, tartaric acid, oxalic acid, etc.), nitrogenous substances (proteins, amino acids, amides, etc.), tannins, glycosides (amygdalin, Hesperidin, etc.), pigment substances (fat-soluble pigments, chlorophyll, carotenoids, anthocyanins, etc.), vitamins (vitamin C, vitamin A, vitamin B, etc.), aroma substances (amyl acetate, formic acid, acetic acid, lemon Aldehydes, etc.), oils...

AI Technical Summary

Problems solved by technology

[0003] Due to the fact that fruits and vegetables need to go through the transportation link from the planting place to the consumer, and the imported fruits, or the differences between the north and the south of the country, during the transportation process, the preservation and protection of the fruits are particularly important to ensure that the fruits are in good condition when they arrive at the sales office, and at the same time , during the storage of fruits, they also need to be wrapped with plastic wrap to reduce the loss of water and maintain the taste. The existing plastic wrap is usually made of PP, PVC, PE and other materials, and most of them are single-layer or multi-layer composite materials. It is not only limited in tensile strength and tear resistance, but also has a closed structure, which is wound on the surface of vegetables and fruits to form a closed environment, and fruits and vegetables will produce various gases and moisture through respiration. In a closed environment, these gases and Moisture will accelerate the ripening and aging of fruits and vegetables. At the same time, the formation of water provides a good environment for the reproduction of bacteria, which leads to the accelerated overripe and rotting process of fruits and vegetables.

[0004] Microporous plastic wraps have been researched abroad to solve the above problems, but the production process of this type of microporous plastic wraps is relatively difficult. If the formation of micropores is completed by using low-cost mechanical perforation technology, the size of the micropores cannot be guaranteed. , quantity and distribution, if other methods are used to improve the accuracy, the cost will be higher, making the product too expensive and difficult to sell

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