HUEC 2040-CH. 4 OUTLINE

HUEC 2040-CH. 4 OUTLINE - CHAPTER 4 NATURAL CELLULOSIC...

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CHAPTER 4 NATURAL CELLULOSIC FIBERS Cellulosic fiber s- composed of natural cellulose, regenerate cellulose, and regenerate chemical variants of cellulose - Natural cellulose: derived from wide variety of plant sources o Seed hair fibers—grow in seed pod on plants o Bast fibers—removed from stem of plants o Leaf fibers—found on leaves of plants o Miscellaneous—from mosses, roots, and the like - Manufactured cellulose: o Regenerated-- include rayon and lyocell o Modified—include acetate and triacetate The Cellulose Family - Natural Fibers o Seed hair Cotton Kapok Milkweed o Bast Flax (linen) Jute Ramie Hemp Kenaf o Leaf Abaca Sisal Henequen Pina
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o Miscellaneous Coir Spanish moss Sacaton (root fiber) - Manufactured Fibers o Rayon Viscose rayon High-wet-modulus rayon Cuprammonium rayon Lyocell o Modified cellulose Fibers Acetate Triacetate - General Characteristics of Cellulosic Fibers o Physical Properties Density—tends to be relatively high; fabrics made from feel comparatively heavy Relatively low elasticity and resilience—wrinkle easily and don’t recover from wrinkling readily Absorbency and moisture regain—generally high; slow to dry after wetting, comfortable to wear, and easy to dye Good conductors of heat and electricity—carry warmth away from body & favored for use in hot weather and warm climates; don’t exhibit static build up Tend to burn easily—steady, fuzzy-edged, orange flame such as paper; generally can withstand fairly high dry heat or ironing temps before they scorch o Chemical Properties Good resistance to bases—excessive bleaching will harm but carefully controlled bleaching isn’t detrimental Mineral acids are extremely damaging Most can withstand high water temps **all of these permit laundering with strong detergents, controlled bleaching, and hot water temps
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Most manufactured cellulosic more sensitive to chem. And require more careful handling and gentle agitation with lower water temps o Other agents Silverfish likely to attack heavily starched cellulosic fabrics Most susceptibe to attack by fungi, especially mildew Extended exposure to sunlight tends to damage Are biodegradable Seed Hair Fibers - Grow from seeds that formed in pods on certain plants - Most widely used is cotton - Others include kapok, milkweed, cattail Cotton - Cotton in the Global Mkt. o China o US o India - The Cotton Plant o Fibers grow on seeds within the boll (seed pod) o Pt of genus Gossypium o Each fiber is single plant cell that develops as elongation of a cell in outer layer (epidermis) of cotton seed o Lint— seed hairs o Linters— secondary growth; too short to be spun into yarn - Types of Cotton o Short Staple: 3/8 to ¾ in. ; Asiatic; short and course o Intermediate Staple: 13/16 to 1 ¼ in.; American Upland; intermediate length & coarseness; makes up largest quantity of cotton fiber grown in US
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This note was uploaded on 05/06/2010 for the course HUEC 2040 taught by Professor Staff during the Fall '08 term at LSU.

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HUEC 2040-CH. 4 OUTLINE - CHAPTER 4 NATURAL CELLULOSIC...

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