Polypropylene PP Material Properties And Uses

Polypropylene application range

Automotive industry (mainly using PP containing metal additives: mudguards, ventilation ducts, fans, etc.), appliances (dishwasher door liners, dryer ventilation ducts, washing machine frames and covers, refrigerator door liners, etc.), daily necessities Consumer goods (lawn and garden equipment such as lawnmowers and sprinklers, etc.).

Injection mold process conditions

Drying treatment: If stored properly, no drying treatment is required. Melting temperature: 220-275 degrees Celsius, be careful not to exceed 275 degrees Celsius.

Mold temperature: 40-80 degrees Celsius, 50 degrees Celsius is recommended. The degree of crystallization is mainly determined by the mold temperature. Injection pressure: can be as large as 1800bar.

Injection speed: High-speed injection is usually used to reduce the internal pressure to a minimum. If there are defects on the surface of the product, low-speed injection at a higher temperature should be used.

Runners and gates: For cold runners, the typical runner diameter range is 4-7mm. It is recommended to use a circular injection port and runner. All types of gates can be used. The typical gate diameter range is 1-1.5mm, but gates as small as 0.7mm can also be used. For edge gates, the smallest gate depth should be half the wall thickness, and the smallest gate width should be at least twice the wall thickness. PP material can use hot runner system.