Modified cross section yarn

Claim 1

A MULTIFILAMENT YARN OF POLYCAPROAMIDE HAVING A FORMIC ACID RELATIVE VISCOSITY BETWEEN ABOUT 30 AND 75, A FILAMENTS OF SAID YARN HAVING TRILOBAL CROSS SECTION CONSISTING OF A CENTER LOBE AND TWO PENDANT LOBES, EACH LOBE BOUNDED BY A CIRCULAR ARC WHICH DEFINES A CENTER OF CURVATURE AND RADIUS OF CURVATURE OF EACH LOBE, SAID CENTERS OF CURVATURE BEING POSITIONED TO DEFINE AN INCLUDED ANGLE AT THE CENTER OF SAID CENTER LOBE BETWEEN 80* AND 120*; SAID LOBES BEING SEPARATED BY PERIPHERAL ARCS OF INVERSE CURVATURE WHICH ARCS BETWEEN CENTER LOBE AND PENDANT LOBES ARE ESSENTIALLY IDENTICAL AND HAVE LARGER RADII OF INVERSE CURVATURE THAN DOES THE ARC BETWEEN THE TWO PENDANT LOBES; SAID CROSS SECTION HAVING A LINE OF SYMMETRY AND NO CENTER OF SYMMETRY, SAID LINE OF SYMMETRY PASSING THROUGH THE CENTER OF CURVATURE OF THE CENTER LOBE AND BISECTING THE REGION OF INVERSE CURVATURE BETWEEN THE PENDANT LOBES, THE RATIO OF THE RADIUS OF CURVATURE OF THE PENDANT LOBES OF THE RADIUS SEPARATION BETWEEN THE CENTERS OF THE CENTER LOBE AND PENDANT LOBE BEING BETWEEN 0.60 AND 1.0 SAID CROSS SECTION HAING BETWEEN 400* AND 750* OF CIRCULAR LOBE ARC; SAID YARN HAVING INDIVIDUAL FILAMENT DENIERS BETWEEN 7 AND 25, SAID FILAMENTS HAVING ANGULAR CRIMPS SUCH THAT THE PACKAGED CRIMP INDEX IS BETWEEN 4% AND 11%, AND HAVING A RELEXED CRIMP INDEX BETWEEN 8 AND 15 PERCENTAGE UNITS GREATER THAN SAID PACKAGE CRIMP INDEX; SAID ANGULAR CRIMPS POSSESSING AT THE CRIMP POINTS SHARPLY DEFINED INTERNAL STRAIN AS MAY BE DETECTED BY POLARIZED LIGHT, AND SHARPLY DEFINED ZONE OF CRYSTALLINE DISORIENTATION AT SAID CRIMP POINTS; SAID YARN HAVING DENIER BETWEEN 2000 AND 4500.