The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1994
Filed:
Aug. 04, 1992
Heinz-Georg Wassenhoven, Moenchengladbach, DE;
W. Schlafhorst & Co., Moenchengladbach, DE;
Abstract
A process and apparatus for treating yarn formed on an open-end spinning machine of the type wherein the yarn is drawn from a rotor through a navel and through draw-off rolls is provided. The yarn is guided from the navel to the draw-off rolls in a path at least a portion of which is inclined with respect to the axis of the navel and a false twist is applied to the yarn during its travel in the inclined portion of the path between the navel and the draw-off rolls. The yarn is permitted to untwist between the false twist application and the draw-off rolls in response to the applied false twist. The untwisting of the yarn causes fiber ends on the surface of the yarn to project outwardly in a hairiness or fleeciness producing manner. The false twist applying element can include a member which produces a rotating air stream about the periphery of the traveling yarn. An initial false twist applying element or elements may be located obliquely at the change of direction location to impart an initial false twist to the yarn.