A Study of the Properties of Knitted Fabrics Made with Viscose Vortex and Air-Jet Spun Yarns.pdf

1、One of the oldest man-made fibers is viscose rayon (viscose).Originally developed as a cheapalternative to silk, it is considered a biodegradable fiber since it is manufactured from wood pulp.Viscose fiber has a soft and

2、 comfortable feel, and produces fabrics with a unique drape, superiorclothing comfort and appearance characteristics.As a cellulose fiber, it possesses absorbencylevels that are higher than cotton.However, it has a high

3、propensity to pilling thus givinggarments an ugly appearance.
　　 Vortex and air jet spinning technology form the fasciated yarn technology which provides yarnwith unique structure that can be produced at a high produ

4、ction rate.The two methods alsoproduce yarns with low hairiness levels, high abrasion resistance and low pilling.The uniqueproperties of viscose fibers on one hand and vortex and air jet spinning technology on the otherh

5、and can be exploited to produce fabrics with superior clothing comfort.
　　 In this research work, knitted fabrics were produced using viscose vortex and air jet yarns.Difficulties like yarn breakage and fluctuating t

6、emperatures hindered the production of structureslike single jersey and pique.The structures studied were 1 × 1 Rib, Full cardigan and HalfCardigan.
　　 The study involved analysis of the yarn hairiness and irregulari

7、ty.Vortex yarns had a hairinessindex of 0.13 and air jet yarns 6.84; unevenness (U ％) of 8 and 9.8 respectively.Fabrics'physical properties like pilling and abrasion resistance were also examined as well as thephysiologi

8、cal comfort characteristics like air and water vapor permeability, wicking and quickdrying capabilities.All the tests conducted were in line with the ASTM International standards.
　　 The study also involved an invest

9、igation of the effect of stitch density on the physical andcomfort properties of the fabrics from the vortex and air jet yarns.The results indicated that anincrease in stitch density was associated with high abrasion res

10、istance, wicking levels and watervapor permeability.However, tight structures had low air permeability and drying rates.
　　 Comparison of the characteristics of vortex and air jet yarn fabrics indicated that air jet

11、yarnsproduced knitted fabrics with better air and water vapor permeability.Conversely, vortex fabricswere superior in terms of pilling and abrasion resistance, wicking and drying capabilities.Therefore, it was adjudged t