HDPE injection molding process parameters

Barrel temperature of HDPE injection molding process parameters

Loading area: 30~50ºC (50ºC)

Area one: 160~250 ºC (200ºC)

Area two: 200~300 ºC (210ºC)

Area three: 220~300 ºC (230ºC)

Area four: 220~300 ºC (240 ºC)

Area fie: 220~300 ºC (240 ºC)

Nozzle: 220~300 ºC (240 ºC)

 Material temperature of HDPE injection molding process parameters: 220~280ºC

Barrel temperature of HDPE injection molding process parameters: 220ºC

Mould temperature of HDPE injection molding process parameters: 20~60ºC

Injection pressure of HDPE injection molding process parameters: it has good flow properties, we should avoid using high injection pressure 80~140MPa (800~1400bar); expect some thin containers can reach to 180MPa (1800bar)

Holding pressure of HDPE injection molding process parameters: shrinkage is high, we should need long time to hold pressure about the product, the size is the key factor; about 30%~60% of the injection pressure.

Back pressure of HDPE injection molding process parameters: 5~20MPa (50~200bar); the area of low back pressure can cause irregular color

Injection speed HDPE injection molding process parameters: about the thin containers, we need high injection speed; medium injection speed is suitable to other plastic products.

Screw speed of HDPE injection molding process parameters: high screw speed is allowed, if only we finished the plasticization process before we the cooling time is finished.

Measurement stroke of HDPE injection molding process parameters: 0.5~4D; it is important that the measurement stroke of 4D provide enough remaining time.

Surplus material: 2~8mm, it depends on the measurement stroke and screw diameter.

Prebake of HDPE injection molding process parameters: it is not needed; if the storage conditions are not good, we can prebake for one hour in the temperature of 80ºC.

Cycle rate of HDPE injection molding process parameters: 100%

Shrinkage rate of HDPE injection molding process parameters: 1.2~2.5%; shrinkage rate is high; but will not shrink after 24 hours.

Gate system of HDPE injection molding process parameters: pin gate

Machine downtime: it is not needed to clean with other materials.

Posted by Lydia, from Sino Mould,China

E-mail: export12@sinomould.com

        sino1007@gmail.com

Skype: dakumar-08

MSN: plastic-mould01@hotmail.com