METHOD FOR PREPARING POLYETHER FILAMENT YARN, AND POLYESTER FILAMENT YARN PREPARED THEREFROM, AND POLYESTER TIRE CORD THE COMPRISING THE SAME

摘要

A manufacturing method of a polyester multifilament yarn, the polyester multifilament yarn produced thereby, and polyester tire cord including the same are provided to supply the polyester tire cord having high modulus and a low shrinkage rate. A manufacturing method of a polyester multifilament yarn for industrial use comprises the following steps of: producing a released yarn by melting and spinning a polyester chip having inherent viscosity of 0.85 ~ 1.3 and an ethyleneterephthalate unit of 90 mole % at least at temperature of 290 °C or less; manufacturing a polyester partially oriented yarn by cooling and solidifying the released yarn; and drawing the polyester partially oriented yarn having a drawing ratio of 2.5 times or less comparing to the total drawing ratio.