The mould-material assembly is set in motion, the mould rotates in all directions and the plastic powder flows down the walls by gravity. As rotation speeds are low, the effect of centrifugal force is negligible.
The plastic mould is then heated by the addition of heat from an oven, a gas ramp or infra-red panels. The metal mould then heats up and transfers its heat to the powder, whose grains begin to melt and stick to the wall of the mould. The melting process continues until, one by one, all the grains have melted. At this point, the material has reached the right melting temperature. On the last layer, which represents the inner face of the moulded part.
At the end of the heating period, the thermoplastic material is at a temperature above its melting point, and its consistency remains viscous, so it must be cooled. This is done by spraying the mould with fresh air and/or a mist of water. When the material has reached below its crystallisation or solidification temperature, it continues to be cooled until it can be handled.
Once the part obtained is sufficiently rigid and cold, the mould is opened, the moving part of the mould is lifted and the part is extracted, exactly reproducing the internal architecture of the mould. The part is then ready for finishing or assembly with other parts.
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