| 摘要 |
1,222,972. Texturing yarns. M LEFEBVRE. 11 Jan., 1968 [12 Jan., 1967: 23 March, 1967], No. 1693/68. Headings D1F and D1W. A yarn is textured by means of an air stream in which shock waves are produced to deform the yarn, the air stream being heated and/or the yarn being preheated to set the deformations in the yarn. The shock waves are produced by the speed of the air flow changing from supersonic to subsonic, or by an ultrasonic generator which may be controlled by amplified signals from a microphone which picks up the waves from a control yarn positioned in a venturi. One or more airy ducts are directed radially into a chamber through which the yarn passes or tangentially in order to false twist the yarn. If there is more than one tangential entry duct the rotating flows produced may be in the same or opposite directions. The yarn may pass in succession through two chambers having opposite directions of air flow. The tension on the yarn may be periodically varied so that the yarn periodically moves from the outer boundary of the rotating air flow to the inner boundary so that an alternatively twisted yarn is produced. There may be feed pipes from a dye bath connected to the air duct or ducts so that the dye liquid can be evaporated and dye the yarn while the yarn is spread out in the chamber. Two different dyes may be injected at different places so as to dye the yarn interior and exterior differently. |
