VACUUM SPINNING OF FASCIATED YARN FROM SLIVER

摘要

ABSTRACTA fasciated yarn suitable for making apparelfabric and having properties approaching that of ringspun yarn is produced by vacuum spinning, includingdirectly from sliver. The elongated hollow shaft(20) of the vacuum spinning apparatus has a vacuumreservoir (32), or interior chamber, that isgenerally in the shape of a right circular cone, andthe interior passageway (31) of the shaft from thefirst end (21) thereof to the interior chamber canhave the form of a right circular cone frustum. Thepeforations (40) operatively connected to theinterior chamber have a generally wedge-shape. Theperforations and the passageway sections between thefirst end of the shaft and the perforations aredimensioned so that they allow sufficient air flow toachieve optimum fiber wrapping action. The fasciatedyarn comprises vacuum spun yarn consisting of fibersincluding core fibers and wrapper fibers, the wrapperfibers being predominantly individual fibers althoughhaving some groups of wrapper fibers. The groups ofwrapper fibers appear as non-uniform, non-consistentgroups and provide a relatively smooth appearance.The wrapper fibers are wrapped at a helix angle ofabout 30° (e.g. about 30-50°), and about 20-30percent of the fiber mass comprises the wrapperfibers. The wrappers are essentially devoid of augeror corkscrew appearance. The core fibers areessentially parallel staple fibers. Initialthreading of the vacuum spinning apparatus isprovided by a vacuum tube (745) mounted for rotationabout an axis parallel to and spaced from the axis ofrotation of the shaft, the vacuum tube beingconnected up to a vacuum reservoir (742) and sourceof vacuum (728) and rotatable from an inoperative toan operative position.