Patent ID: 9637842
Date: 2017-05-02
CPC Classifications: D01H

Claim:
1. A method for drafting spun yarn, comprising: feeding twisted fiber strands into a drafting mechanism to draft and obtain twistless fiber strands at an output holding jaw of the drafting mechanism; moving said twistless fiber strands output from the output holding jaw into a vortex twist zone disposed between the output holding jaw and a block jaw, the vortex twist zone drawing in air to form an air eddy causing a primary twist action upon the twistless fiber strands so that each of the twistless fiber strands obtain an axial twist along an axis of the twistless fiber strands to create axial-twisted fiber strands; integrating and compressing the axial-twisted fiber strands via a suction action of a suction member forming part of the vortex twist zone to create column fiber strands; and twisting the column fiber strands output from the block jaw of the drafting mechanism to create spun yarn, wherein, an input diameter of the axial-twisted fiber strands is no greater than four times an output diameter of the spun yarn.