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        2. Precautions For Cling Film

          Jun 14, 2024 Leave a message

          How to choose and buy
          When buying fresh-keeping boxes or cling film, be sure to check whether the specific name or chemical structure is marked. If there is only an English name but no Chinese label, you should be cautious when buying. At the same time, be sure to choose products marked with the words "for food use".
          Fresh-keeping boxes are mainly made of two types of materials: 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 cling film, it is recommended to first buy self-adhesive cling film made of polyethylene (PE), especially when preserving meat, fruits, etc., because from a safety perspective, PE cling film is the safest. If you want a longer shelf life, it is recommended to choose polyvinylidene chloride (PVDC), because this type of cling film has better moisturizing properties and has the longest shelf life among the three types of cling films. Polyvinyl chloride (PVC) cling film has become the choice of many people due to its good transparency, good viscosity, good elasticity and relatively low price. However, it must be noted that it cannot be used to preserve oily foods, because it is a resin composed of polyvinyl chloride resin, plasticizer and antioxidant, and it is non-toxic in itself. However, the added plasticizers, antioxidants and other main auxiliary materials are toxic. The plasticizers in daily polyvinyl chloride plastics mainly use dibutyl terephthalate, dioctyl phthalate, etc. These chemicals are toxic, and the fats and oils in food can easily dissolve the plasticizer "ethylamine" in the cling film, which has a great destructive effect on the human endocrine system and disrupts the body's hormone metabolism. The antioxidant lead stearate of polyvinyl chloride is also toxic. Polyvinyl chloride (PVC) products containing lead salt antioxidants will precipitate lead when they come into contact with ethanol, ether and other solvents. When polyvinyl chloride containing lead salt is used as food packaging and meets fried dough sticks, fried cakes, fried fish, cooked meat products, cakes and snacks, the lead molecules will diffuse into the oil, so polyvinyl chloride plastic bags cannot be used to hold oily foods. In addition, it must not be heated in a microwave oven or used at high temperatures. Because polyvinyl chloride plastic products will slowly decompose hydrogen chloride gas at higher temperatures, such as around 50°C, this gas is harmful to the human body, so polyvinyl chloride products are not suitable for food packaging.
          Scope of use
          Experiments show that 100 grams of leek wrapped in plastic wrap has 1.33 mg more vitamin C content after 24 hours than when it is not wrapped, and rapeseed and lettuce leaves have 1.92 mg more. However, the experimental results of some vegetables are quite different. After 100 grams of radish wrapped in plastic wrap is stored for one day, its vitamin C content decreases by 3.4 mg, beans decrease by 3.8 mg, and cucumbers lose vitamin C equivalent to 5 apples after being stored for one day and one night.
          Cooked food, hot food, food containing oil, especially meat, should not be packaged and stored with plastic wrap. Experts point out that after these foods come into contact with plastic wrap, it is easy for the chemical components contained in the material to volatilize and dissolve into the food, which is harmful to health. Most of the plastic wrap sold on the market, like the commonly used plastic bags, are made of ethylene masterbatch as raw materials. Some plastic wrap materials are polyethylene (PE for short), which does not contain plasticizers and is relatively safe to use; some materials are polyvinyl chloride (PVC for short), which often contains stabilizers, lubricants, auxiliary processing agents and other raw materials, which are harmful to the human body. Therefore, you must be cautious in choosing.

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