The plastic bag is made of plastic film and it is very convenient for containing food or other daily necessities.
There are two kinds of plastic bags, one is non-toxic, they are made of polyethylene, polypropylene and melamine and other raw materials, can be used to hold food; the other is toxic, they are made of vinyl chloride As a result, this can only be used as a general package, and there is a danger of poisoning if it is packaged with food.
How to identify these two plastic bags?
(1) Place the plastic bag in the water and press it by hand to the bottom of the water. After waiting a moment, the surface of the bag will be a non-toxic plastic bag, and it will be a toxic plastic bag when it sinks under the water.
(2) Touching the surface of the plastic bag by hand is very smooth and non-toxic. If the colors are mixed, they are sticky and astringent and are toxic.
(3) When the plastic bag is shaken by hand, the sound is crisp and non-toxic. The sound is boring or there is no sound. It is a toxic plastic bag.
(4) Combustion: Cut the plastic bag into a corner, put it on fire, and burn it. The non-toxic burning is to burn it. It will continue to burn after leaving the fire, and a yellow flame will appear, and the melted plastic drops like a candle. Drop out, paraffin odor; toxic, non-flammable, green flame after burning, and there is a smell of smelly nose.
(5) Smell smell: Irritant, nauseous, and other abnormal odors are mostly toxic, or plasticizers or other additives may be excessive, and the quality is poor.
Food bags on the market can be used to contain dry, wet, raw and cooked foods. They are safe and non-toxic. Food bags and candies are also non-toxic. The plastic bags used to pack daily goods, clothes, shoes, socks, electrical appliances, and hardware parts may be toxic and should not contain food.
Non-toxic plastic bags are generally made of polyethylene, while toxic plastic bags are made of polyvinyl chloride. Because polyvinyl chloride resin contains unpolymerized vinyl chloride monomer, it is a compound that can be toxic to the human body. In addition, some plasticizers, stabilizers, pigments, and other auxiliary materials are added to the process of processing polyvinyl chloride resin into plastic bags. Some auxiliary materials are toxic. These toxic substances are easily used. The extraction of oil or water in food and eating it with food is harmful to human health.
PVC resin itself is non-toxic. If polyvinyl chloride resin is used to reduce the amount of free vinyl chloride monomer to a very small amount, when the finished product is manufactured, non-toxic auxiliary materials can be used strictly to make a non-toxic polyvinyl chloride plastic. bag.
Polyethylene plastic bags and PVC plastic bags are generally difficult to distinguish. With a burning method, it can be easily identified. Polyethylene can burn, the flame is blue, the upper end is yellow, and the paraffin odor is emitted when burning; the PVC is extremely difficult to burn, yellow when it is on fire, green outside, and emits irritating smell of hydrochloric acid.
Plastic bags have no poison in use, which is also related to the use of methods. Some food bags are printed with logos and other words on the outside. It is not safe to turn the food bags over and use them when they are used.