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Polyethylene terephthalate (PET) is generally melt spun to give yarns which are then drawn at an elevated temperature since the glass transition (Tg) of PET is 70 °C. Incremental drawing of synthetic fibers involves the drawing of as-spun yarns in several discrete steps along the surface of two corotating conical bodies. For drawing at an elevated temperature a chamber type of heating system was designed in which the drawing bodies were enclosed and a constant temperature maintained. Multifilament PET-POY (Polyethylene Terephthalate-partially oriented yarn) of 130 denier/34 filaments was drawn at 300 m/min with the draw-ratios of 1.76, 1.84 and 2.00 respectively by incremental drawing process (IDP) as well as by the conventional drawing process (CDP) and the properties compared. It was seen that the mechanical and structural properties were significantly better in case of IDP than CDP at equivalent draw-ratios. The mechanical property results are explained on the basis of structural development during drawing.

Incremental Drawing of Polyethylene-terephthalate Partially Oriented Yarn (PET-POY) **