Process	Injection moulding
	For parts of all sizes which require accurate and complex geometry. Granular plastic or pellets are melted by friction with a rotating screw and actual heating, and then injected into the mould. Normally, the process is reserved to thermoplastics, but it can be used for shaping fibre reinforced thermoplastics or thermosettings. When shaping composites, parts with good mechanical properties cannot be produced as the content of fibres must be limited. Production volumes are medium to large, and the cycle time per part is very short.
Danish Name	Sprøjtestøbning
Category	Mass conserving processes, Shaping plastics
Materials	Plastics Composites
Typical products	Disposable drinking glass Hedge cutter Milestone Razor, biodegradable Razor, ordinary Shaver, rechargeable Spoon, clasp type Satellite box Washing machine drum Gear Hinge for gramophone lid Video front-panel
Competing processes	Extrusion Gas assisted injection moulding
References	A. Johnsen Industri A/S Helarco Jotun Danmark A/S Molytex A/S
Price notes	The mould is normally very expensive since it is often made from hardened steel in order to withstand high pressures. The mould cavities are often made with Electric Discharce Machining (EDM).
Additional info	Possible to achieve good dimensional accuracy and surface finish.
Photo	Thomas Nissen (Computer graphics)
Copyright	© 1996-2019 Torben Lenau This page is part of Design inSite Disclaimer