INTRODUCTION
Many engineering parts with complex shapes are made by injection moulding of thermoplastics due to its flexibility for replicating at fast production rates. To obtain the best performance of these products, for instance longer life time and reduced energy consumption, both tribological properties and processing conditions must be tuned up (Apichartpattanasiri, Hay et al. 2001). Despite considerable knowledge regarding component and tool design, mould filling, tool fabrication and general processing requirements, part demoulding has often been neglected or given little importance on its effects on parts manufacturability (Delaney, Bissacco et al. 2012). For understanding the factors that influence the demoulding issues, and the mechanisms associated to the factors contributing to the demoulding force, Delaney et al. made a review and classification of demoulding issues and proven solutions (Delaney,
Bissacco et al. 2012).