Patent ID: 8883304

Claim:
A synthetic fiber, comprising: a solid core; a sheath covering the solid core, wherein the sheath comprises: a plurality of segment portions; and a plurality of sacrificial portions connected to the plurality of segment portions, wherein the plurality of segment portions and the plurality of sacrificial portions are arranged alternately on an outer surface of the solid core: wherein the materials of the solid core, the segment portions and the sacrificial portions are different from each other, wherein a cross-section of the solid core is a circular cross-section while a cross-section of the sheath is an annular cross-section, and an inner diameter of the annular cross-section is the same as a diameter of the circular cross-section, in the cross-section of the synthetic fiber, both the segment portions and the sacrificial portions are directly in contact with an outer circumference of the solid core, and the segment portions and the sacrificial portions are radially extended from the outer circumference of the solid core toward an outside of the synthetic fiber, and wherein a material of the solid core is high shrinkage polyethylene terephthalate or HSPET, a material of the segment portions is semi dull polyethylene terephthalate or SDPET, and a material of the sacrificial portions is semi dull polycaprolactam or SDPA6, and wherein weight percentage of the solid core, segment portions, and sacrificial portions are 30%, 45%, and 25%, respectively.