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)
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