Chapter 14

Chapter 14 - Chapter 14 Texturing filament yarns: Texturing...

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Unformatted text preview: Chapter 14 Texturing filament yarns: Texturing increases bulk for comfort, resiliency, provides stretch and alters texture or feel Texturing can be done by the fiber manufact urer after extrusion (most fibers are textured by manufacturer). But this step can be done later. *Texturing filament yarns is much less expensive than spinning staple yarns* Texturing yarns - Mechanical methods: Air-jet texturing yarn filaments are formed into loops by jets of air. Mechanical, no heat o Produces randomly spaces and sized loops with a little stretch o Yarns closely resemble staple yarns Texturing yarns Thermomechanical methods: Fibers deformed under heat twisted, crimped, or curled heat set Produce yarns with increased bulk and greater stretch that mechanical processes Only thermoplastic fibers! False-twist texturing o Yarn twisted, heated, and untwisted disk system using friction more common today o bending/crimp heat set -> wavy/snarls when tension is removed o MOST USED METHOD FOR TEXTURING YARNS FOR APPAREL Hot-fluid jet texturing associate with carpeting o BCF yarns used in nylon, polyester, and olfin carpet o Imitates wool! o Increased bulk and resilience o Hot air /stream steps: Fibers entangle and yarn expands Fibers bunch up 3D crimp Cooled Stuffer box method (old method) o Fibers fed in heated chamber faster than they are withdrawn o Permanent crimp Gear Crimp Process (not common process) o fibers passed between teeth of 2 heated gears saw-tooth configuration results o fibers passed over heated knife edge and develop crimp The making of staple yarns Preparation for spinning: Blending Staple Fibers 1. Take advantage of the best qualities of each fibers 2. Reduce price 3. Achieve decorative effects done during opening, carding, or drawing Breaking & Opening Bundles hand or machine OSHA requires that the opening of bales be done in closed systems so that workers of the plant do not come into contact with small fibers that could lead to lung disese. Cleaning Fibers cotton sand, dirt, vegetable matter wool sand, dirt, vegetable matter, grease manufactured fibers do not require cleaning and may need to be separated cotton system most used woolen system worsted system *Manufactured staple fibers processed on any of these according to size synthesized fibers...
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This note was uploaded on 01/19/2012 for the course HUEC 2040 taught by Professor Staff during the Fall '08 term at LSU.

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Chapter 14 - Chapter 14 Texturing filament yarns: Texturing...

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