Process of making poly(trimethylene terephthalate) bulked continuous filament carpet yarn
This invention relates to a poly(trimethylene terephthalate) BCF carpet yarn having a Y-shaped cross-section that has an modification ratio and a arm angle within a specific range, and a method for preparing it. The BCF carpet yarn has excellent bulk property and spinning efficiency, and a carpet made from it has good appearance, sense of touch, and tufting efficiency.
1. A method for preparing a poly(trimethylene terephthalate) bulked continuous filament carpet yam with a Y-shaped cross-section, comprising the step of melt-spinning poly(trimethylene terephthalate) having an intrinsic viscosity of 0.8 to 1.2 and a moisture content of 50 ppm or less at a spinning rate of 1,500 to 4,000 m/mm, wherein a spinning nozzle is used, which has a Y-shaped cross section whose modification ratio and arm angle are within a range of a parallelogram ABCD in FIG. 3 .
2. The method according to claim 1 , wherein the Y-shaped cross section of the nozzle has a length ratio of arms of 1:0.6 to 1.8.
3. The method according to claim 1 , further comprising the step of endowing a crimp of 10 to 60% to filaments through a texturing nozzle after drawing.
4. The method according to claim 3 , further comprising the step of endowing a knot to filaments through a whirling machine by 10 to 45 times/m after filaments pass through the texturing nozzle.
5. The method according to claim 4 , further comprising the steps of blending a color master batch of 2 to 5% based on a base chip with raw materials, and spinning them.