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Plastic bag

The plastic bag is a bag made of plastic (polypropylene, polyester, nylon, etc.) as the main raw material. It is an indispensable item in people's daily life and is often used to load other items. Because of its low cost, extremely light weight, large capacity, and easy storage, it is widely used, but it is banned from production and use in some countries because of the short degradation cycle of plastic bags and the difficulty of handling.

Commonly used food plastic bags are mostly made of polyethylene film, which is non-toxic and can be used for food. There is also a film made of polyvinyl chloride, which is also non-toxic, but the additives added according to the use of the film are often harmful to the human body and have certain toxicity. Therefore, such films and plastic bags made of the film are not suitable for holding food. To identify PVC plastic bags and polyethylene plastic bags, the following simple method can be used for identification.

Polyethylene film (non-toxic) The film is milky white, translucent (especially obvious when several layers are stacked), it is more lubricious to the touch, as if the surface is coated with a wax layer, it is shaken hard, the sound is brittle, it is flammable in flame, the flame is yellow, and there is sticky droplets when burning. And have the smell of a candle burning.

Polyvinyl chloride film (generally toxic) If no pigment is added, it is transparent. It feels sticky on the surface, it is hard to shake, the sound is low, it is not easy to burn in case of fire, it is extinguished from the flame, and the flame is green.

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