Screw

Extrusion head

Multilayer parison

Blow mould

Compressed air

Blow pin

Scrap for recycling

Coextruded HDPE container

HDPE

Adhesive

PA or EVOH

Adhesive

Regrind HDPE

HDPE

Multiple extruders are used to co-extrude 4 or 6 layers combining HDPE with Polyamide or EVOH.