Patent ID: 6032341
Filing Date: 2000-03-07
Classification: D02G

Abstract:
A non-interlacing expirating yarn bulker comprising:a body having an enclosed yarn passage extending therethrough,the yarn passage including an inlet region, a throat region and an expanding region, the inlet region joining the throat region at the upstream end of the throat and the expanding region joining the throat region at the downstream end of the throat, the area of the inlet region at its downstream end being indicated by A.sub.i,a single pressurized fluid channel extending through the body and intersecting with the yarn passage in the throat region,the throat region, at its downstream end, having a substantially rectangular cross-sectional configuration taken in a first cross-sectional plane perpendicular to a first yarn flow vector defined at the downstream end of the throat region, the area of the throat region at its downstream end being indicated by A.sub.t,the area of the inlet region A.sub.i being less than the area A.sub.t,the pressurized fluid channel in the vicinity of its intersection with the throat region having a rectangular cross-sectional configuration taken in a second cross-sectional plane perpendicular to a fluid flow vector extending therethrough, the area of the pressurized fluid flow channel in the vicinity of its intersection with the throat region being indicated by A.sub.p,the expanding region having an exit end spaced a predetermined distance L from the throat, the distance L being in the range from about one (1) inch to about twelve (12) inches, the end of the expanding region having a rectangular cross-sectional area taken in a third cross-sectional plane perpendicular to a second yarn flow vector defined at the downstream end of the expanding region, the area of the expanding region at its end being indicated by A.sub.e,the throat and the pressurized fluid channel, along their intersection, having equal width dimensions, as taken in any cross-sectional plane perpendicular to an axis aligned with the first yarn flow vector and extending through the throat, andthe ratio of the area A.sub.t to the area A.sub.p being in the range from about 0.5 to about 2.0,the ratio of the area A.sub.e to the area A.sub.t being in the range from about 1.1 to about 3.0.