PE-LD (low density polyethylene)


PE-LD (low density polyethylene)

Typical Applications:

Food packaging materials, medical equipment, hollow molded products, fiber, films, wire and cable sheaths, pipes, pipe connectors, electrical appliances, machinery, automobiles, daily necessities (bowls, cabinets, etc.)


Injection Molding Process Conditions:

Drying treatment: normally not required

Melting temperature: 180 ~ 280

Mold temperature: 20 ~ 40 In order to achieve cooling uniformity and economical heat removing, it is suggested that cooling channel be at least 8 mm in diameter, and the distance from the channel to the mold surface be not more than 1.5 times the diameter of the channel.

Injection pressure: maximum 1500 bar.

Holding pressure: maximum 750 bar.

Injection speed: high injection speed recommended.

Runner and pouring gate: various types of runners and pouring gate can be used. PE-LD is especially suitable for hot runner molds.


Chemical and Physical Properties:

The density of PE-LD material for commercial use is 0.91~0.94 g/cm3. PE-LD is permeable to gas and water vapor. The high thermal expansion coefficient of PE-LD is unsuitable for making durable products. If the density of PE-LD is between 0.91 and 0.925 g/cm3, the shrinkage rate is between 2% and 5%. If the density is between 0.926 and 0.94 g/cm3, the shrinkage rate is between 1.5% and 4%. The actual shrinkage rate also depends on injection molding process parameters. PE-LD can resist many solvents at room temperature, but aromatic and chlorinated solvents can make it expand. Similar to PE-LD, PE-LD is prone to cracking due to environmental stress.

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