POLY-TRIMETHYLENE TEREPHTHALATE SOLID CORE FIBRILLATION-RESISTANT FILAMENT HAVING A SUBSTANTIALLY TRIANGULAR CROSS SECTION, A SPINNERET FOR PRODUCING THE FILAMENT, AND A CARPET MADE THEREFROM

摘要

OF THE INVENTION In a first aspect the invention is a solid core, fibrillation-resistant, synthetic polymeric filament having a longitudinal axis extending therethrough and a three-sided cross section in a plane perpendicular to the longitudinal axis, the sides being substantially equal in length and convex in form, each side having a midpoint therealong, each midpoint lying on an inscribed circle centered on the central axis of the filament, the inscribed circle having a radius substantially equal to a length "c", each side meeting an adjacent side through a substantially rounded tip centered on a respective circle of curvature, each circle of curvature having a radius substantially equal to a length "b", each circle of curvature being spaced from the axis of the filament by a distance "a", each tip of the filament lying on a circumscribed circle having a radius substantially equal to a length (a + b), the filament having a modification ratio (MR) defined by the ratio of the radius (a + b) of the circumscribed circle to the radius (c) of the inscribed circle, wherein the filament has a denier-per filament ("dpf") in the range 10 < "dpf" < 35; the distance "a" lies in the range 0.00025 inches (6 micrometers) < "a" < 0.004 inches (102 micrometers); the distance "b" lies in the range from 0.00008 inches (2 micrometers) < "b" < 0.0010 inches (24 micrometers); the distance "c" lies in the range from 0.0003 inches (8 micrometers) < "c" < 0.0025 inches (64 micrometers); and the modification ratio ("MR") lies in the range from about 1.1 < "MR" < about 2.0. Figure 1 12C2 12M1 121 12c0 -- b /143 6b 16' 12' /12Rl -12 2 16 2 - 26 12c|