Injection compression moulding

One process - many applications

The injection compression moulding process allows low-stress, thick-walled components to be produced without sink marks and with high contour accuracy. Here, we will show you the complex procedure and innovative applications, such as the production of precision free-form surfaces.

Injection compression moulding

Process principle
Injection compression moulding is an adapted injection moulding process. Injection compression moulding is characterised by a change in cavity volume during the ongoing injection and/or holding pressure phase. This process also enables the production of low-stress, thick-walled components without sink marks and with high contour accuracy.

As a rule, the mould is not fully closed during the injection compressing moulding process. Only once the melt has already been injected into the cavity is the mould fully closed. This means that less pressure has to be applied in order to fill the cavity, causing the pressure gradient to already fall during the filling phase. When the clamping unit is closed, a uniform compression moulding pressure is applied to the complete cavity surface of the shrinking component.
to the process

LED lens

Compression moulded optical parts
ARBURG participates in the OptiLight research project for the energy-efficient production of innovative hybrid lenses for LED streetlights. With the injection compression moulding process, precision free-form surfaces are produced which deflect the light in a targeted manner, according to a rectangular illumination profile.

The energy-efficient LED lenses are produced using an equally energy-efficient electric ALLROUNDER ALLDRIVE injection moulding machine. The project is sponsored by the German Ministry of Education and Research (BMBF) and supervised by Projektträger Karlsruhe (PTKA). The objective is an efficient production chain for the high-volume production of microstructured, thick-walled polymer hybrid lenses.
to the moulded part