Friction behaviour of thermoplastics : test method to determine the friction coefficient between plastics and moulding surfaces

Abstract

Plastics have a tendency to reproduce the surface structures of the cavity parts in an injection mould. Factors such as the surface roughness of this parts and the method and direction of machining employed in mouldmaking play an important role. The polymer melt penetrates into the roughness grooves of the metal surface, which leads to small undercuts and mechanical anchorage.