Abstract
AbstractThis article provides an approximate but sufficiently practical method of geometry design of a coat‐hanger die having both uniform flow rate and residence time across the full width of the die. Such a die is often needed when a heat‐sensitive resin such as poly(vinyl chloride) is sheeted, because different residence times across the die width are apt to cause a sheet defect in the transverse direction of the sheet. Although some assumptions were made facilitating mathematical analysis, an application of this method to a sheeting die 1 m wide gave good uniformity of flow rate and residence time.
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