HUEC FINAL

HUEC FINAL - 03:11 Generalcharacteristicsofcellulosefibers...

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03:11 General characteristics of cellulose fibers Density= high Elasticity and resiliency= low  Absorbency and moisture regain= high Slow to dry Easy to dye Comfortable to wear Electrical and heat conductivity= good Base and acid= good Heat= tolerance to heat Microorganism and insects Silverfish, fungi, mildew, rot Environmental conditions= sunlight  Seed hair fibers: cotton Cotton in global market Most used in natural fiber in the world China, U.S. (Texas), India Surpassed in production and used by polyester  The cotton plant Short, staple fibers: 3/8” ¾”
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Intermediate staple fibers 13/16”- 1 ¼”  American upland= variety most grown in U.S. Long staple fiber: 1.5”-2.5” Egyptian, prima, sea island Lint linters  Production of the fiber Separate and clean fiber from seed Cotton gin  Quality evaluation- “graded” Length, strength, fineness and color Micro hair fineness Carding Aligns and straightens fibers  Spinning Molecular structure High DP (degree of polymerization) OH groups Attract water, dyes Enable hydrogen ponds between chains 70% crystalline 30% amorphous crystalline areas not oriented
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properties of cotton (swath 57) physical properties color  white, tan, green, brown, mauve shape kidney bean lumen central canal convolutions  twist in lengthwise direction fibrils layers that spiral and revere directions  luster low, unless treated specific gravity feels heavier than polyester, nylor  mechanical properties strength medium, 10-20% stronger wet modulus (stiffness) moderately high elongation and recovery low= both  resilience  H bonds broken and reform Flexibility Chemical properties Absorbency and misuter regain Good absorbency Slow drying Heat and electrical conductivity Conducts heat No static build up  Effect of heat combustibility Scorches  Burning paper order, fluffy gray ash  Chemical reactivity 
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03:11 Rayon
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03:11 First regenerated fiber 1891 “artificial silk” manufactured  1910 first commercially produced in U.S 1924 named rayon
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HUEC FINAL - 03:11 Generalcharacteristicsofcellulosefibers...

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