Method for producing noil yarn

Abstract

To spin a yarn (17) of staple fibers, a spinning centrifuge (3) is used with a two-stage spinning action. Shortly before the end of the first stage, a prepared yarn end at the yarn wound on a cross wound bobbin (15) is laid in front of the final pair of rollers (10) at the drawing unit (9), and is spliced with the partially-twisted yarn (11) from the first stage. The additionally fed sliver (6) is cut, and the yarn path is changed. In the second stage, the partially-spun yarn cake (12) in the spinning centrifuge is taken off with additional twisting, and wound into a cross wound bobbin. The two-stage spinning process, for a yarn of staple fibers, takes the yarn end from the bobbin into a preparation station (18) before it is spliced with the partially-twisted yarn, where the end of the yarn is untwisted at least partially and thinned out. At the end of the second spinning stage, the yarn is taken off at a higher speed with a lower twist. The draft is temporarily raised at the drawing unit during the splicing phase at the first spinning stage, and at the end of the first spinning stage. The working direction of the final pair of drawing rollers is reversed while the partially-spun yarn is drawn off the spinning cake in the spinning centrifuge. A pressure roller at the final pair of drawing rollers is swung into a take-off setting, to take the partially-spun yarn from the cake in the spinning centrifuge.

Description

technical field [0001] The present invention relates to a method of producing a staple fiber yarn. Background technique [0002] It is known that there are different production methods for the production of short staple yarns. [0003] In addition to ring spinning and rotor spinning, for example centrifugal spinning is a known method for a long time. [0004] The centrifugal spinning method is further divided into two different spinning forms, namely one-step spinning and two-step spinning. [0005] In both spinning forms, the feed material can be a fiber sliver stored in a spinning can, or a roving from a roving bobbin, which is drafted in a drafting device according to the required yarn count, And the yarn is conveyed into the high-speed rotating spinning centrifugal tank through a yarn guide tube mounted on an axially movable support. [0006] The feed material from the outlet of the yarn guide tube forms a spun yarn that wraps around the wall of the centrifugal tank a...

AI Technical Summary

Problems solved by technology

[0016] This known spinning method is of course disadvantageous, the yarn piecing done in the splicer, especially in terms of the yarn structure, always differs significantly from a "normally" spun yarn

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