Claims
- 1. A method of manufacturing yarn comprising the steps of, providing a source of unprocessed supply yarn constituted of a bundle of extruded thermoplastic filaments wherein all of said filaments are either undrawn or all are partially drawn to the same degree with at least a substantial portion of the filaments having contaminant particles embedded therein and randomly spaced along the length thereof and with said bundle of filaments being twisted to a level to preclude disintegration of said filaments during subsequent processing, continuously withdrawing the yarn from said source at a preselected linear speed, passing said yarn through a draw-twist zone under a predetermined tension to simultaneously draw said yarn to a predetermined cross-sectional dimension while effecting breakage of substantially all of the filaments at the loci of the contaminant particles therein to provide free ends of said filaments, said yarn when in said draw-twist zone being subjected to stretching in the order of 40-95 percent of the ultimate elongation of the yarn, concurrently heating and cooling said yarn in said draw-twist zone while twisting the yarn in said heated zone and untwisting the yarn to thereby false twist the yarn, a substantial portion of the free ends of the filaments being twisted into said bundle of filaments constituting the yarn as the yarn is twisted and at least a portion of said free ends being released to extend away from said bundle of filaments when said yarn is untwisted with unbroken filaments randomly situated along the length of said yarn with portions of said unbroken filaments being on the surface of said yarn and portions being interiorly of said yarn, and finally collecting the processed yarn after it is untwisted.
- 2. The method as set forth in claim 1 including the step of passing said yarn through a second heated zone under a controlled degree of relaxation after said yarn in untwisted and prior to said yarn being collected to thereby set said yarn in said relaxed configuration.
- 3. The method as set forth in claim 1 wherein said unprocessed yarn is a filament forming polyester and said contaminent is a material selected from a group consisting of polymer char, gel, titanium dioxide, stabilizer residues, cellulose fibers, fiberglass, or thermoplastics.
- 4. The method as set forth in claim 1 including the step of sizing said yarn as the yarn is untwisted and while said broken filaments are positively gripped between an upstream and a downstream location.
- 5. A yarn produced in accordance with the method of claim 1.
- 6. A yarn produced in accordance with the method of claim 2.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of co-pending U.S. application Ser. No. 693,738 filed June 7, 1976, now abandoned.
US Referenced Citations (6)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
693738 |
Jun 1976 |
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