What material is plastic bag made of?
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. Degradable plastic bags mark
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.
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.
HDPE-- HDPE high density polyethylene, referred to as HDPE. The density is 0.941 to 0.965g/ cubic centimeters. It is made of low pressure polymerization, so it is also called low-pressure polyethylene. Milky white, indicating poor luster. The machined films can be blown by blow molding and T die extrusion. Heat resistant, resistant to cooking, cold resistant, resistant to freezing, moisture resistant, gas proof and isolating, it is not easy to be damaged, and the strength is two times of LDPE. Easy opening. The paper is strong and is called "paper - making plastic film"". BOPP-- of BOPP biaxially oriented polypropylene film, also known as BOPP film, English abbreviation code BOPP, characterized by stretching molecular orientation, mechanical strength, folding strength, air tightness, moisture barrier property is better than ordinary plastic film. The unit price is lower than that of cellophane. Because of the excellent transparency of the film, the post press reproduction is especially bright and beautiful. It is an important base material for plastic composite flexible packaging
