Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CHAPTER 14- MANUFACTURING YARNS- Spinning— used to describe formation of manufactured fibers by extruding them through spinneret ALSO used to describe formation of yarn from fibers- Drawn— 1) drawing of manufactured fibers to orient molecules within fiber ALSO 2) step in certain processes for creating yarns from staple fibers Making Filament Yarns- Spinnerets used that have exact # of holes ( from 30- several 1000) needed for particular type of yarn- Following extrusion, fibers drawn or alternatively, drawing may take place during subsequent texturing step o Such as with POY polyester- Drawn filament may be twisted together tightly or loosely- *manufactured filament yarns simpler & less expensive to produce*- Spun silk— short silk fibers made into staple yarns- Texturing Filament Yarns o Manufactured yarns treated with processes that use heat setting OR mechanical entangling of fibers to alter bulk, texture, & stretch o Textured to increase bulk for comfort, resiliency, & feel OR to provide stretch to yarn Done by fiber manufacture or @ some later step in manufacture of yarn Steps of drawing & texturing became continuous & now more commonly carried out in simultaneous operation using POY yarns *texturing filament yarns much less expensive than spinning staple yarns o w/ widespread use of POY, texture (who may also be fiber producer) simultaneously draws & textures yarns o Stretch-texturing methods— introduce crimp or curl in fibers that can be pulled out when yarn is stretched; yarn recovers crimp upon relaxation False-twist Stuffer-box Edge-crimping o Air-Jet texturing Textured for bulk & have very little recoverable stretch o Mechanical Methods Only mechanical action used to entangle fibers in yarn Produced primarily through air-jet texturing in which texture produced NOT by heat but by feeding yarns into system in which slack filaments formed into loops by jets of air Resultants have relatively lg. # of randomly spaced & sized loops along filaments or fibers & very little stretch (many fibers retain straight or slightly twisted conformation) ** air-jet texturing used for filament yarns of ANY fiber** o Thermo-mechanical Methods Fibers mechanically deformed under heat have not only increased bulk but greater stretch Fibers twisted, crimped, or curled—subjected to heat to set in modified conformation—then relaxed **only thermoplastic fibers can be durably textured this way** False-Twist Texturing— • Most common method used • Yarn twisted in heated zone & allowed to untwist as it cools—because yarn is moving rather...
View Full Document

This note was uploaded on 05/06/2010 for the course HUEC 2040 taught by Professor Staff during the Fall '08 term at LSU.

Page1 / 14


This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online