Abstract
Differential scanning calorimetry was used to study part quality from an injection blow moulding machine producing polystyrene thin-walled containers. Cavity-to-cavity, within cavity and shot-to-shot problems were detected. Multiple relaxation peaks observed in the temperature range Tg-TLL had the relationship Tj=1.02 Ti K, for TLL⩾Tj> Ti⩾ Tg and (j−i)=1. Based on some simple assumptions, a model was developed that allowed the multiple peaks be resolved between the injection moulding and blowing steps of the process and into a three-dimensional array.
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