1、 Introduction to the production of environmental protection plastic bags
According to the professional committee of plastic recycling of China Plastics Association, 1 billion plastic bags are used to buy vegetables every day in China, and the consumption of other plastic bags is more than 2 billion every day. Plastic bags not only bring convenience to people's life, but also cause some environmental problems. Therefore, the country now promotes the use of degradable plastics as raw materials for life packaging bags, such as PLA, PBAT, corn starch, etc., and continues to promote the use of environmentally friendly plastic bags to replace traditional plastic materials: PE, PP, PVC, POF, etc.
2、 Material of plastic bag
1. Low pressure polyethylene plastic bag PE
The earliest and most commonly used plastic bag in China is made of PE film. It is characterized by low cost, good waterproof, but poor gas resistance. Widely used: A. garbage bag, strain bag; B. Convenience bag, shopping bag, handbag, vest bag; C. Fresh keeping bag; D. Woven bag inner bag.
2. High pressure polyethylene plastic bag PEF
High pressure polyethylene has small density and low melting temperature. It is mostly used in film products: A. food packaging: cakes, candy, fried goods, biscuits, milk powder, salt, tea, etc; B. Fiber packaging: shirts, clothing, needle cotton products, chemical fiber products; C. Daily chemical supplies bag.
3. Polypropylene plastic bag PP
Polypropylene is non-toxic, tasteless, low density, strength, stiffness, hardness and heat resistance are better than low-pressure polyethylene, and can be used at about 100 ℃. Common acid and alkali organic solvents have little effect on it. Uses: A. mainly used for packaging textiles, knitted cotton products, clothing, shirts, etc. B. Packaged food can be used for microwave heating.
4. PVC plastic bag PVC
PVC is one of the largest plastic products in the world. It is cheap and widely used. PVC resin is white or light yellow powder, and can be made into a variety of hard, soft and transparent products by adding an appropriate amount of plasticizer. Can be used as: A, gift bag; B. Luggage bags, needle cotton products packaging bags, cosmetics packaging bags; C. Document bag, data bag.
