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What do plastic bags usually do?

Polyethylene (polyethylene, PE), referred to as PE. It is a polymer organic compound made of ethylene. Polyethylene is recognized as the best material in the world for contact with food. Non-toxic, tasteless, odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, with moisture-proof, antioxidant, acid, alkali, gas tightness of general, excellent thermal sealing performance. Known as "Plastic Flower" laudatory name.   It is the most important material in the printing of plastic packaging. pvc--PVC PVC, the molecular formula (CH2-CH2CL) n, is the most important type of vinyl polymers, and is the second largest plastic product in the world after polyethylene. Domestic production is the first in plastics.   In the printing industry, often with PVC color calendering film and transparent film production books and periodicals, folders, tickets and other wrappers packaging decoration. shrinkfilm--Shrink Thin Film (shrinkfilm) is a thermoplastic plastic film that is stretched and directed during the production process and is contracted by hot air treatment or infrared irradiation during use.   After heat treatment, the film is tightly wrapped in the packaging, the contraction force in the cooling stage to achieve the maximum value, and long-term preservation. ldpe--low-density polyethylene low-density polyethylene, referred to as LDPE is a national plastic packaging printing industry, the largest amount of varieties. The proportion is 0.92 ~ 0.93, can float in water. Low crystallinity (60%), in the pressure 1000~3000kg/c㎡ bulk polymerization, it is also called high pressure polyethylene. At 23 ℃, the density is about 0.92. The die-casting process is poor, and it is suitable to be processed into tubular film by blow moulding. Suitable for food packaging, fiber products packaging, daily chemical products packaging. Marking of degradable plastic bags.

hdpe--high-density polyethylene high-density polyethylene, referred to as HDPE. The density is 0.941~0.965g/cubic centimeter. With low pressure polymerization, it is also known as low pressure polyethylene. Milky white, indicating poor gloss. The processing film can be blown by blow molding and T-die extrusion process. Heat-resistant cooking, cold resistance and refrigeration, moisture, gas, isolation performance, and not easy to damage, the strength of twice times the LDPE. Very easy to open.   Strong paper, known as "paper-prepared plastic film." bopp--biaxial Tensile polypropylene film biaxial tensile polypropylene film, also known as biaxial tensile polypropylene film, the English abbreviation code BOPP, its characteristics of tensile molecular orientation, mechanical strength, folding strength, gas density, moisture resistance is better than ordinary plastic film. Compared with cellophane, the unit size is lower than cellophane. Because the transparency of this film is very good, after the reproduction of color exceptionally bright beautiful, plastic composite soft packaging important base material