HUECEXAM4

HUECEXAM4 - Friday Oct. 31 Effectsofyarntwist o Affects

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Friday Oct. 31 Effects of yarn twist o Affects Appearance, behavior, durability  o Increasing twist Decreases yarn size Increases strength, elasticity, abrasion resistance, brightness Increases shedding of soil It might get on it but it won't get in it  Lowers absorbency  Lessons snagging  Tight and compact together Direction of yarn twist o Twist Number of turns around its axis per unit length Tpm  Turns per meter Tpcm Turns per centimeter Tpi  Turns per inch o z-twisted yarns - right twist Direction of twist follows center bar of letter Z o S-twisted Yarns - Left twist Direction of twist follows center bar of letter s Size of yarns o Direct numbering Weight measurement Fixed length of yarn Tex  Weight in grams of 1,000 meters Denier Weight in grams of 9,000 meters Decitex Weight in grams of 10,000 meters Higher the number-- coarser the yarn  Indirect numbering  o Measurement of fixed weight of yarn o Cotton count Number of 840 hanks in a pound o Linen count  Number of 3000 hanks per pound  o Woolen count
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Number of 1,600 hanks per pound o Wristed count Number of 560 hanks per pound o Higher number Finer the yarn  Yarn production methods o Spinning  Formation of manufactured fibers by extruding from a spinneret Formation of a yarn from fibers o Drawing To orient molecules in the fiber Processes for creating yarns from staple fibers  Stretched textured yarns  o Thermo-mechanical texturing process Twisted Crimpled or curled Heat set Relaxed o Only thermoplastic fibers  o False twist process Yarn twisted, heated and untwisted Crimp, kink, waviness o Stuff box process Fibers fed in small chamber Crimped shape, heat set  Shoving it into the chamber and making it sit there-- creating the  crimp o Gear crimp process Filaments passed between teeth of 2 heated gears Like the crimping iron o Knit-deknit process Yarns knitted into fabric  Fabric heat set, yarns unraveled  Retains crimp Transforming Filaments into Tow o Tow  A bundle of filaments that will be broken or cut into staple lengths o Sliver A continuous rope of staple fibers  "Tow To Top Process" o Pacific converter Cuts tow in staple lengths Rolled into a sliver
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o Perlock system Tension to tow Breaks filaments They pull it on either end to the point where is breaks  o Turbo-stapler process Variation of Perlock system High-bulk yarns Acrylic  Making staple fibers into yarns  o 1 - blending staple fibers Best qualities of each fiber, reduce costs
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HUECEXAM4 - Friday Oct. 31 Effectsofyarntwist o Affects

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