Textile Dictionary ,WORDS U

U

1. ULTRAVIOLET DEGRADATION: Weakening or deterioration caused by exposure to ultraviolet rays of sunlight or artificial light.

2. ULTRAVIOLET RESISTANCE: Ability to retain strength and resist deterioration on exposure to sunlight.

3. UNDRAWN YARN: Extruded yarn (filaments), the component molecules of which are substantially unoriented. Undrawn yarn exhibits predominantly plastic flow within the initial stages of stretching and represents an intermediate stage within the production of a manufactured yarn.

4. UNEVEN DYEING: a cloth dyeing that shows variations in shade resulting from incorrect processing or dyeing methods or from use of faulty materials.

5. UNEVEN SHRINKAGE: A wavy, warp wise condition within the fabric that forestalls it from lying flat on a level .

6. UNEVEN SURFACE: An irregular surface characterized by no uniformity within the physical configuration of the yarns or fibers making up the surface of the material .

7. UNEVEN YARN: A yarn that varies in diameter to an abnormal degree.

8. UNFINISHED WORSTED: A worsted fabric with a comparatively soft hand and a light-weight nap.

9. UNIDIRECTIONAL FABRIC: a cloth having reinforcing fibers in just one direction.

10. UNION CLOTH: A term describing a cloth woven from two or more sorts of yarn. for instance , a union cloth may have a cotton warp and a wool filling

11. UNOPENED STAPLE: Staple fiber in bunches or clusters within the bale in such a condition that it'll not process smoothly through carding and subsequent operations within the spun-yarn plant.

12. UPDRAFT METIER: A dry textile machine during which the air flow within the drying cabinet is countercurrent to the yarn path (upward).

13. UPTWISTER: A machine used for twisting yarns in an upward path from a rotating vertical supply package to a horizontal take-up package. Used for spun yarns and to alittle extent for adding twist to some filament yarns.

14. UPTWISTING: the method of twisting yarn on the up twister. The yarn to be twisted, which has been wound on a balanced support package, is placed on a revolving spindle. The yarn form the revolving supply package is fed upward through a gathering eye or guide, over a stop motion and a tension bar or bars, through a traversing guide, and onto the revolving collecting package.

15. URETHANE: The name of a gaggle of organic chemical compounds or resins built from isocyanate, a really reactive material that liberates gas during reaction to supply foams of varied types. Two sorts of compounds that react with isocyanate to make foam are polyesters and polyether. Polyurethanes are used for foams and in other compounds in fiber form. The polyester variety shouldn't be confused with polyester fibers

16. USTER TESTER: An instrument that gives endless measurement of the variation in weight per unit length of sliver, roving, and yarn.

17. UV ABSORBERS: Polymer additives that absorb light within the UV region or that trap radicals produced in fiber during photo oxidation. they supply stabilization against actinic degradation. Some critical applications include geotextiles, recreational surface polymers and fibers, tenting tarpaulins, etc.