| 摘要 |
Disclosed herein is a novel voluminous multi-filament stretch of set yarn and a method for manufacturing the yarn. The yarn, formed from continuous filaments, substantially all of which have the same extension to break, has the appearance of spun yarn, i.e., yarn produced from staple length fibers. The continuous filaments constituting the yarn are spun with contaminents present therein. Subsequently, the undrawn or partially drawn yarn is subjected to simultaneous drawing and false twisting which causes generally all of the filaments to break in regions where the contaminents are entrapped while the yarn is contemporaneously processed into textured yarn. The false twisting step includes the usual twisting and untwisting. Since substantially all of the filaments are broken into relatively short lengths, hereinafter sometimes called "staple," during false twisting it is necessary to preclude disintegration of the yarn as it is untwisted. This achieved by any of several techniques. These include providing pre-twist in the supply yarn so that as the yarn undergoes subsequent untwisting, as part of the false twisting, sufficient residual twist exists to bind the staple together and maintain the coherency of the yarn. Another technique includes positively engaging one end of the staple length fiber during untwisting while simultaneously sizing the staple. Consequently, a filamentary stretch yarn is produced which has the appearance of a textured spun yarn. As part of the method the stretch yarn may be post-treated to yield a set yarn with spun yarn characteristics if desired.
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