Process Blow moulding
Used for hollow parts of all sizes. A tube of molten plastics is extruded into an open mould.The mould closes and thereby the bottom of the part welds.

Hot air is blown into the tube and it is blown up until it fills out the mould cavity.

Parts can be produced in small and large quantities, since setup cost is low and tools/moulds are often made of aluminium and cheap.
Danish Name Blæsestøbning
Category Mass conserving processes, Shaping plastics
Materials PS ABS SAN PVC PC PE PP
Typical products Bottle for motor oil
Bottle for organic solvents
Tubing for a car
Competing processes Injection blow moulding
References Dudek Plast A/S
Gravenhorst Plast A/S
Kornerup Plast Trading ApS
Rosti A/S
Price notes Moulds are normally made from metal, but compared to injection moulding are tooling costs much lower. Setup times are low.
Photo Thomas Nissen (Computer graphics)
Copyright © 1996-2004 Torben Lenau
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