In order to achieve a skin formation on the particle foam, the cavities of the foaming mould are electrically temperature-controlled on one side. At 200°C, the surface of the moulded part is melted, so that the granules liquefy. When the heat is reduced to demoulding temperature, they form a plasticised coating.
The result of this method is a durable surface without the use of nozzles that convinces by its puncture resistance and excellent abrasion properties, and has a certain similarity to injection moulding.
In contrast to more complex injection moulding procedures, RUCH NOVAPLAST uses this method to produce large volumes of stable, tooled series parts in one process step. The positive qualities of the EPP, for instance its insulation properties and resilience, are not compromised.
RUCH NOVAPLAST has used this process successfully for many years to manufacture chin parts for motorcycle helmets. Skins are even applied to air distribution components in chassis.