| 摘要 |
PURPOSE:A polyester undrawn yarn of a specific intrinsic viscosity and an optical birefringence is drawn at a low draw ratio, as being heat-treated at a specified temperature to produce, easily and inexpensively, the titled fiber yarn suitable for use as wefts in tire cord fabrics, because its high elongation on breaking. CONSTITUTION:A polyester filament undrawn yarn Y which has been formed by the customary process and has more than 0.75 intrnsic viscosity and less than 0.01 optical birefringence is, e.g., led to the feed roller 1, passed on the hot plate 2 heated over 130 deg.C, preferably at 150-190 deg.C, then taken up with the taking-up roller 3 rotating at a perphral speed more than 3 times that of the feed roller 1 to effect drawing at a less than 3, preferably 2.0-2.8 draw ratio, whereby the objective yarn is obtained.
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