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What are the materials for clearwater southeast packaging plastic bags?

Issuing time:2018-11-07 00:00

1. Polyethylene (PE), abbreviated as PE. It is a high-molecular organic compound made by adding ethylene. Polyethylene is recognized as the best material for food contact in the world. Non-toxic, odorless, odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, with moisture, oxygen, acid, alkali, air tightness, excellent heat sealing properties. It is known as the "flower of plastic." It is the most used and most important material for plastic packaging printing.

2. PVC is abbreviated as PVC and its molecular formula is (CH2-CH2CL)n. It is the most important category of vinyl polymers and it is the second largest plastic type in the world after polyethylene. The domestic output ranks first in plastics. In the printing industry, PVC, colored calendered films and transparent glazing films are often used to make envelopes for books, folders, tickets, and other covers.

3. Shrink film is a thermoplastic film that is stretched and oriented during the production process and shrinks during processing by hot air treatment or infrared irradiation. After the heat treatment, the film is tightly wrapped around the packaged material. The shrinkage force reaches a maximum during the cooling stage and can be stored for a long time.

4. Low-density polyethylene, LDPE for short, is the most widely used product in the plastic packaging and printing industry in various countries. The specific gravity is 0.92 to 0.93 and can float on water. Low crystallinity (60%), bulk polymerization at pressures of 1000-3000 kg/cm2, is also called high pressure polyethylene. At 23°C, the density is around 0.92. Due to poor calenderability, it can be processed into a tubular film by blow molding. Applicable to food packaging, fiber products packaging, daily chemical products packaging.

5. High-density polyethylene, referred to as HDPE. The density is 0.941 to 0.965 g/cm3. With low-pressure polymerization, it is also known as low-pressure polyethylene. Milky white, indicating poor luster. Processed films can be blown and T-die extruded. It is resistant to heat and cooking, cold and resistant to freezing, moisture-proof, air-proof, and good insulation performance. It is not easily damaged and its strength is twice that of LDPE. Extremely easy to open. Strong paper-like, known as "paper-plastic film."

6. Biaxially oriented polypropylene film, also known as biaxially oriented polypropylene film, English abbreviation code BOPP, characterized by tensile molecular orientation, mechanical strength, half-fold strength, gas density, moisture barrier properties superior to ordinary plastic film . Compared with cellophane, unit price is lower than cellophane. Due to the excellent transparency of this film, it is particularly important for plastic composite flexible packaging to reproduce the bright and beautiful colors after printing.


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