Following essentially the analysis of Nakajima and Shida but using a one-constant stored energy function a simplified relationship is given between recoverable shear strain imposed on a flowing melt during capillary flow and the magnitude of the extrudate swelling on emerging from the capillary. Where experiments on capillaries of several different (L/R) values cannot be carried out there are some advantages to studies using a zero-length (orifice) die rather than a long capillary.
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Bagley et al. (1970) studied this question.
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