A method is given for predicting birefringence, natural draw, and maximum elongation of continuous-filament polyethylene terephthalate) yarn when the take-up speed and spun denier are known. The method is accurate for yarns made from the normal molecular weight in common use in the industry and can be adjusted for any filament count. In addition, an approximation is given which is useful in choosing the proper draw ratio for draw texturizing.
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