Abstract: This invention relates to a trilobal filament having at least one axially extending void, preferably one axially extending void in each lobe, wherein each lobe has a composite curve profile having a first arm angle .alpha. and a second arm angle .beta., the cross-section has a modification ratio of 2.4 to 5.0, and the total cross-sectional area is 5 to 15 percent void. In a further aspect, this invention is a spinnerette for producing a filament comprising at least one bore group, wherein the bore group has three legs divergent from each other by 130.degree. to 150.degree. and each leg includes two substantially parallel capillary sections and one nipple capillary section which extends to the outermost point of each leg.

Abstract: This invention is a trilobal, synthetic fiber, intended for use in carpets, having an axially extending hole in each lobe, the total cross-sectional area of the fiber being about 5 to 12 percent void, said fiber cross-section having a modification ratio of between about 2 to 3, and an arm angle of about 15.degree. to 45.degree., so that a fiber having improved bulk, soil hiding and resiliency is apparent in a carpet having face fiber of said fiber.

Abstract: This invention is a trilobal, synthetic fiber, intended for use in carpets, having an axially extending hole in each lobe, the total cross-sectional area of the fiber being about 5 to 12 percent void, said fiber cross-section having a modification ratio of between about 2 to 3, and an arm angle of about 15.degree. to 45.degree., so that a fiber having improved bulk, soil hiding and resiliency is apparent in a carpet having face fiber of said fiber.