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What is the principle of plastic wrap?
The fresh-keeping film has moderate oxygen permeability and moisture impermeability, so as to adjust the oxygen content and moisture content around the fresh-keeping food. Because the internal and external oxygen can communicate, it can effectively prevent the reproduction of anaerobic bacteria and block the dust in the air, so as to prolong the fresh-keeping period of food. Therefore, preservation includes "water retention", "quality assurance" and "nutrition protection". Generally speaking, foods with the correct use of preservative film can be kept fresh at room temperature for about a week.
Application classification of fresh-keeping film
According to the purpose, the fresh-keeping film on the market can be divided into two categories: one is ordinary fresh-keeping film, which is suitable for fresh-keeping in refrigerators; One is microwave oven fresh-keeping film, which can be used not only in refrigerator, but also in microwave oven. The latter kind of fresh-keeping film is much better than ordinary fresh-keeping film in terms of heat resistance and non toxicity. Therefore, consumers should pay special attention to the selection of fresh-keeping film and use it separately. In daily life, we can have many substitutes that can replace plastic wrap, such as paper products, ceramics or glass containers. When using, if the utensils are covered with plastic wrap, do not fill them to avoid touching food and prevent the impact of plastic wrap on food.
