The appearance of plastic bags plays a major role in life, providing people with great convenience, so the usage is also very large. In this context, the quality of plastic bags is very critical.
Look at the plastic bag under the light or sunlight. If there are black spots or impurities, you must not buy it for use. It is made of discarded plastic bags and is likely to be poisonous. Be sure to smell the smell when buying plastic bags. Qualified plastic bags should be non-toxic and odorless, without any irritating toxic gases. Smelly plastic bags are added with various additives, which will cause harm to the human body, so be sure not to buy them.
Qualified plastic bags are strong and durable, with very high strength, and will not be easily torn off. Unqualified plastic bags have added harmful substances and are not strong to use. Breaks easily. Good plastic bags will make a crisp sound when shaken, and poor plastic bags will be quiet and muffled. Another way to test the quality of plastic bags is to put them in water. The ones that float up are non-toxic plastic bags, and the ones that sink to the bottom are toxic plastic bags. Put the plastic bag on the fire, it will burn quickly, the flame is yellow, and it will drip down like a candle. Smells like paraffin. Toxic plastic bags are difficult to burn, the flames are green, and they give off a choking smell.
Due to the non-toxicity and good mechanical properties of PLA, it is suitable for processing into a variety of food packaging. For example, Walmart uses PLA packaging materials to package food such as bread and doughnuts, and uses PLA's high-quality air permeability to improve the taste of food. In general, the use of biodegradable plastics has become the general trend. The Chinese government has begun to encourage the use of biodegradable plastics from a policy perspective.