Abstract
The influence of die angle on the flow behaviour for high impact polystyrene (HIPS) melt is investigated by using a set of capillaries with a series of entry angles (2α) in this work. It appears that the melt flow basically obeys the index law; the dependence of apparent shear viscosity (η a) on temperature roughly accords with the Arrhenius equation and the values of η a changes with 2α to some extent. The end effect of the melt is significant under experimental conditions, and the end pressure losses (ΔP ends) decrease with increasing 2α; there is a local minimal value of ΔP ends at 2α around 75 °.
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