Plastics are printed

â–¼ Commonly used plastic printed materials can include the following:

1. Polyethlene
The abbreviation PE is the most widely used plastic. The main raw material of polyethylene is ethylene. Can make use of the thermal cracking of pentane to produce ethylene: Pentane pressure cracking, available ethane and propylene, ethane and then dehydrogenation reaction can be ethylene. Its main products are polyethylene lids, cutlery, kitchen supplies, toys and lighting parts.

Polyethylene can be divided into two types, low density polyethylene and high density polyethylene. Low density polyethylene, with a molecular weight of 50,000 to 300,000, a density of about 0.92 g/cm3 high density ethylene, a molecular weight of up to 3 million, and a density of about 0.96 g/cm3.

2. Polypropylene

Polypropylene is produced in the same way as polyethylene, with titanium trichloride and triethylaluminum, tributylaluminum or diethylaluminum chloride as catalysts, dispersed in a solvent and reacted at 10 atm. Polypropylene is slurried, soluble in ethanol, dried after processing.

Polypropylene is harder than polyethylene, has a high softening point and is brittle at low temperatures. The molecular weight is between 80,000 and 150,000, with a specific gravity of 0.90 to 0.91. Related products include the manufacture of silk fibers, transportation equipment, laboratory glass, dropper and injection molding products.

3. PVC (pvc)

The Chinese name is polyvinyl chloride, and its material properties are high in specific gravity and flame resistance. With high transparency, good insulation and good printability. Different formulations have different characteristics, wide application and low cost. When the processing temperature exceeds 190°C, cracking occurs easily, and HCL gas is released. Great environmental impact. Molecular weight between 60,000 and 150,000, with good electrical resistance, fire resistance and so on. Related products include wire and cable jackets, raincoats, and curtains. Addition of additives can make records.

4.Pet polyethylene terephthalate (polyester)

The Chinese name is polyethylene terephthalate (polyester). Its material properties are low specific gravity, no moisture absorption, good insulation, transparency, low cost, and low rigidity.

5. ABS (acrylonitrile-butadiene-styrene tri-copolymer)

The Chinese name is propylene urethane-butadiene-styrene tri-copolymer. The material properties are the proportion of each polymer, ABS with different characteristics, surface strength and heat resistance are all very good, the surface gloss is good, the surface is sprayed and galvanized, hygroscopic, and the general finished product can be dyed Need color. Its related printing products are suitcase surface plates, ABS tubes, and home appliance shells.

6.PC (polycarbonate)

The Chinese name is polycarbonate. Its material properties are good transparency, high impact resistance at room temperature, high temperature resistance, high rigidity, FDA grade, poor abrasion resistance, and poor chemical resistance. Its related printing products include safety glass and transparent containers for medical equipment.

Table 1 Physical Properties of Polyethylene Low Density Polyethylene High Density Polyethylene Molecular Weight 50000~30000 300000~3000000
Tensile strength (lb/in2) 1800~2000 3500~4500
Melting point 110 124~135
Elongation % 600 100
Methyl group 21.5 1.5~3
Crystallinity 60% 90~95%
Dielectric constant 2.3 2.3