Analysis on the problems of food preservative film

2022-08-09
  • Detail

Analysis on the problems of food fresh-keeping film packaging in supermarkets

supermarkets are large users of all kinds of packaging, especially plastic packaging. In recent years, people's awareness of environmental protection has been continuously enhanced, and the requirements for whether the commodity packaging is environmentally friendly and beneficial to health are becoming higher and higher, so most manufacturers also attach great importance to it. However, the plastic packaging used in some commodities is still not safe and environmentally friendly, while some supermarkets still provide customers with toxic plastic bags, which brings hidden dangers to the health of consumers

pvc cling film: the "killer" in microwave ovens is on the shelves of supermarkets. There are many goods covered with cling film. Generally speaking, most of the goods are packed with "linear low density polyethylene" (lld-pe) and polyethylene (PE) materials. The fresh-keeping film made of these two materials can be used safely. But some commodities use fresh-keeping film made of polyvinyl chloride (PVC), which is unsafe

pvc is a kind of hard plastic. To pull it into a transparent and soft fresh-keeping film, manufacturers must add a lot of plasticizers to soften it. If these plasticizers contain phosphorus, potassium, lead and other substances harmful to human body, the PVC fresh-keeping film wrapped on cooked food will harm people invisibly. Especially when encountering food with more fat, plasticizers are easier to release and penetrate deeply into the depth of food. Many families like to put a layer of plastic wrap on the mouth of the bowl when they cook in the microwave oven. If you use PVC plastic wrap, it will cause irreparable damage to your and your family's health over the years. PVC will degrade and melt at 120 ℃, quietly releasing toxic gas chlorine. If you find that there is a pungent smell in the microwave oven, it may be the alarm of chlorine and other impurities "coming out of the cage"

therefore, pay attention to the following points when purchasing fresh-keeping film:

look, if the outer box of fresh-keeping film is marked with "PVC" or "PVC", it is recommended not to buy it

second touch, the fresh-keeping film made of safety materials has good elasticity, and it is tight and thin on the food and bowl mouth. When you pull it hard, it can be pulled for a long time, but the PVC fresh-keeping film is not so obedient, and it feels thick and has poor elasticity; Burn three times, cut a piece of plastic wrap and burn it with fire. PVC is not easy to burn. Once burned, there is an unpleasant smell of plastic. Lld-pe or PE is very easy to burn. The top three export markets are Hong Kong, China, the United States and Vietnam, which smell like candles

bowl noodles: beware of the hidden dangers of foaming plastic bowls. The author found in the supermarket that the bottom of the convenient bowl noodles is marked with "PS" or "PP". PS and PP are "polystyrene" and "polypropylene" respectively, which are very safe and can be safely used. Beware of the foam bowl, which looks loose and contains a lot of bubbles, because the foam is mixed with foaming agent. If the foaming agent contains ammonia compounds, the hot water will escape when it bubbles, which is very harmful to human body. The specific foaming agent that the manufacturer adds to the bowl cannot be seen from the appearance

"tetrafluoroethylene" non stick pot: pay attention to the purchase and use

now, many families use non stick pots to cook food. The reason why it is "non stick" is that the inner surface of the pot is coated with something called "polytetrafluoroethylene", which can also belong to the category of plastic. If the product comes from a small workshop with incomplete facilities, it is possible to mix fluorine monomers into this layer of "plastic" and release them when heated, which is harmful and unhelpful. The nonstick pot sold in big supermarkets is naturally unlikely to be a "poisonous pot". However, "polytetrafluoroethylene" will decompose if heated to more than 400 ℃, and the released "polytetrafluoroethylene" is a highly toxic gas

the inner wall of non stick pots and electric cookers will be coated with this kind of plastic, so be careful not to put the pot on the fire to dry, otherwise, a "poison gas bomb" in your kitchen is not a joke

white plastic bags are preferred for bulk shopping. The food hygiene law clearly stipulates that food packaging can only use colorless products with a certain thickness. All colored plastic bags cannot directly contain food, because most of those colored plastic bags are regenerated from recycled items such as syringes and plastic bottles, which do not meet the requirements of food hygiene. Use these colored recycled plastic bags to package food, and the harmful substances on the plastic bags will enter the food. Wash or 2 The method of heating the instrument with a magnification of 600 times is generally impossible to remove, just like the last treatment

a roll of self extracting milky white plastic bags placed next to the fresh food and fruit counters in the supermarket are mostly made of polypropylene. As long as they are not dirty, they can be safely used to contain food. Try to go to the supermarket to buy vegetables. If you can only buy vegetables in the vegetable market, you should promote the use of vegetable baskets. Otherwise, try to ask the store to provide white or colorless transparent plastic bags

Copyright © 2011 JIN SHI