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Cling film selection method
Sep 29, 2018

When purchasing a crisper or plastic wrap, be sure to check whether it is marked with a specific name or chemical structure. If there is only an English name and there is no Chinese logo, the product should be purchased with caution. At the same time, be sure to choose the product labeled "food".

The crisper is mainly made of polyethylene (PE) and polypropylene (PP). The price difference between the two products is not large, but polypropylene (PP) can better prevent the penetration of grease.

When buying plastic wrap, it is recommended to buy a self-adhesive wrap film made of polyethylene (PE), especially when preserving meat, fruits, etc., because of the safety, PE wrap is the safest. . If you want a longer shelf life, it is recommended to choose polyvinylidene chloride (PVDC) because the cling film of this material has better moisturizing performance and the longest shelf life in the cling film of the three materials. Polyvinyl chloride (PVC) cling film has good transparency, good viscosity, good elasticity and low price, so it has become the choice of many people, but it must be noted that it cannot be used for the preservation of fatty foods because it is made of poly A resin composed of a vinyl chloride resin, a plasticizer and an antioxidant is not toxic by itself. However, the main auxiliary materials such as plasticizers and anti-aging agents are added. The plasticizers in daily-use polyvinyl chloride plastics mainly use dibutyl terephthalate and dioctyl phthalate. These chemicals It is toxic, and the oil in the food can easily dissolve the plasticizer "ethyl ammonia" in the plastic wrap, which has a great destructive effect on the human endocrine system and can disturb the hormone metabolism of the human body. There is also a polyvinyl chloride anti-aging agent lead stearate salt which is also toxic. Lead-salt-containing polyvinyl chloride (PVC) products in contact with ethanol, ether and other solvents will precipitate lead. When leaded salt-containing polyvinyl chloride is used as a food packaging and meets fritters, fried cakes, fried fish, cooked meat products, and cake snacks, it will cause lead molecules to diffuse into the grease, so PVC plastic bags cannot be used. Contains oily foods. In addition, it should not be heated in a microwave oven and should not be used at high temperatures Because polyvinyl chloride plastic products will slowly decompose hydrogen chloride gas at a relatively high temperature, such as about 50 ° C, this gas is harmful to the human body, so PVC products should not be used as food packaging.

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