Polyethylene [1]

PE for short. It is a kind of high molecular organic compound formed by ethylene addition. Polyethylene is recognized as the best material for food contact in the world. Non toxic, tasteless, odorless, in line with the hygienic standards of food packaging. Polyethylene film, light and transparent, with moisture-proof, oxygen resistance, acid resistance, alkali resistance, general air tightness, excellent heat sealing performance. It is the most important material for plastic packaging printing.

PVC -- Polyvinyl Chloride

PVC for short, with the molecular formula of (ch2-ch2) n, is the most important type of vinyl polymer and the second largest plastic variety in the world after polyethylene.

Shrinkfilm -- shrink film

Shrinkfilm is a kind of thermoplastic film which is stretched and oriented in the production process and shrinks when it is exposed to heat air treatment or infrared radiation in the use process. After heat treatment, the film is tightly wrapped on the package, the shrinkage force reaches the maximum value in the cooling stage, and can be stored for a long time.

LDPE -- low density polyethylene

LDPE, or LDPE for short, is the most widely used variety in the printing industry of plastic packaging [1] in various countries. The specific gravity is 0.92-0.93, which can float in water. The crystallinity is low (60%), and bulk polymerization is carried out under the pressure of 1000-3000kg / C ㎡, so it is also called high-pressure polyethylene. At 23 ℃, the density is about 0.92. It is suitable for food packaging, fiber products packaging and daily chemical products packaging.

HDPE -- high density polyethylene

HDPE for short. It is polymerized with low pressure, so it is also called low pressure polyethylene. It is milky white with poor surface luster. The film can be processed by blow molding and T-die extrusion. It is heat-resistant, cold resistant, freezing resistant, moisture-proof, gas proof, good insulation performance, not easy to be damaged, and its strength is twice that of LDPE. Easy to open.

BOPP -- biaxially stretched polypropylene film

Biaxially stretched polypropylene film, also known as biaxially stretched polypropylene film, abbreviated as BOPP, is characterized by molecular orientation, mechanical strength, folding strength, air tightness, moisture resistance better than ordinary plastic film. Compared with cellophane in unit area, the unit price is lower than cellophane. Because of the excellent transparency of the film, the reproduction color after internal printing is particularly bright and beautiful, which is an important base material for plastic composite soft packaging.