What kind of material are plastic bags made of?
PVC-- polyvinyl chloride PVC referred to as PVC, the molecular formula for (CH2 - CH2CL) n, is the most important category of vinyl polymers, is currently the world's second largest plastic varieties after polyethylene. In China, the yield is the first in plastics. In the printing industry, packaging production of books, folders, tickets and other frequently used PVC calendered film cover color and transparent glazing film.
Most are the two, high-density polyethylene and low-density polyethylene. The high density is the kind that is sold in shopping malls, feels, and has a low density
Shrinkfilm-- shrink film (Shrinkfilm) is a thermoplastic film that is stretched during production, contracted, and subjected to thermal air treatment or infrared irradiation during use. After heat treatment, the film is wrapped tightly in the package, and the shrinkage force reaches the maximum value in the cooling stage and can be stored for a long time. LDPE-- low density polyethylene (LDPE), low density polyethylene (HDPE), or LDPE, is the most widely used plastic packaging and printing industry in many countries. The specific gravity is 0.92 ~ 0.93, and can float in water. Low crystallinity (60%), under the pressure of 1000 ~ 3000kg/C square meters of bulk polymerization of high pressure polyethylene. At 23 degrees centigrade, the density is about 0.92. It is difficult to roll forming and is suitable for tubular films. Applicable to food packaging, fiber packaging, daily necessities packaging.
Polyethylene (Polyethylene, PE), referred to as PE. It is a high molecular organic compound which is made up of ethylene. Polyethylene is recognized as the best food for contact with food in the world. Non-toxic, tasteless, odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, with moisture-proof, anti - oxygen, acid, alkali, air tightness, heat sealing and other outstanding performance. Known as "plastic flowers" laudatory title. It is the most important and most important material in plastic packaging and printing.
