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Abstract

In the present study we compare in situ measured demoulding forces with model tests based on reciprocating pin-on-disc configuration at high temperature simulating the mould/thermoplastic interphase. The ejection force and pin-on-disc friction properties were measured for four industrially relevant polymer types (PP, POM, ABS and TPU). The impact on the ejection force was quantified when adding different surface pretreatments (as machined, grinded, blasted, polished and laser textured) to the involved pin-on-disc surfaces and the injection moulding cores. Different PVD coatings (CrN, CrN-HiPIMS and DLC) combined with post treatment involving high-current implantation of nitrogen were investigated. The results revealed that the ejection force could be lowered by up to 70% for some of the thermoplastic types when applying a combination of a wear-resistant coating and nitrogen ion implantation.

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