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Injection Moulding Description
The model is applied to the injection-molding process which is treated in terms of a filling and a cooling stage. Final results are given in terms of the distribution of residual stresses and associated birefringences in the molded part, as influenced by the rheological and thermal properties of the polymer and the processing conditions. The theoretical predictions are compared with birefringence measurements in the literature. Reasonable agreement is obtained for the position and value of maximum birefringence in the 1–2 plane although the birefringence predictions in the 1–3 and 2–3 planes are found to be markedly smaller than the measured values. The present theory indicates that, for a given polymer, the main factors affecting residual stresses and birefringence are melt temperature and flow rate, both of which should be held at the highest permissible levels.
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