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Modelling and verification of ejection forces in thermoplastic injection moulding

Reducing cycle times in the field of injection moulding demands that parts be ejected as soon as they are dimensionally stable. It is, therefore, imperative that the ejection forces be balanced and adequate so as to reduce the probability of part deformation. In this paper, we estimate ejection forces for moulded parts that have been used by the industry, and compare these models to simulation and experimental results for a simple cylindrical sleeve.