Since nanopolysiloxane improves the inner softness of

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Since nanopolysiloxane improves the inner softness of jute and cotton fi bres, it does not show positive improvement in crease recovery. But, owing to the presence of jute fi bre in weft yarn, the dry crease recovery angles of both fi nished and un fi nished fabrics in warp direction are higher than weft direction. 9.6 Bending Length Figure 24 depicts the bending length of fi nished and un fi nished jute-blended fabrics in both directions. The bending length of control fabric is greater in weft direction than in warp direction because of linear density variation between warp and weft yarn and also stiffness of jute fi bre in weft direction. In warp direction, nano + macropolysiloxane emulsion combination fi nishing shows more reduction in bending length (10 %) than that of nanopolysiloxane-based fi nishing (5 %), while in weft direction, nanopolysiloxane fi nishing shows more reduction (12 %) than that of other fi nishing combinations (4 9 %). Nanopolysiloxane diffuses well inside the fi bre matrix and forms a polymer networking, which improves the softness of fi brils of fi bres, i.e. inner softness of jute fi bre, and hence nanopolysiloxane fi nishing reduces the bending stiffness of the jute fi bre (Saville 1999 ). But in the case of combination fi nishing, the improvement in inner softness by the nanopolysiloxane may be reduced, and hence the reduction in bending length is lesser in warp direction compared to weft direction. The nanopolysiloxane is Fig. 24 Bending length of jute-blended fabrics fi nished with nanopolysiloxane-based fi nishing (Lakshmanan et al. 2014 ) 34 N. Gokarneshan et al.
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found to have better effect in the reduction in bending stiffness in case of weft yarn (jute polyester yarn) than in case of warp (cotton yarn) (Fig. 24 ). 9.7 Flexural Rigidity Figure 25 depicts the fl exural rigidity of fi nished and un fi nished jute-blended fab- rics in warp and weft directions. Flexural rigidity is a measure of resistance of a cloth against bending by external forces, and it correlates with the weight per unit area and bending length of the fabric (Ammayappan et al. 2011 ; Ren et al. 2008 ). Being less-elongated natural fi bre, jute fi bre has more stiffness than cotton fi bre, and hence the fl exural rigidity of blended fabric in weft direction (<19,360 mg/cm) is higher than in warp direction (<150 mg/cm) both in control and in fi nished fabrics. Compared with other fi n- ishing combinations, the reduction in the fl exural rigidity is better in nano + macropolysiloxane combination fi nishing both in warp (20 %) and in weft directions (31 %). 9.8 Cost-Effectiveness Dry-on-wet method has been used to apply the fi nishing chemicals on the fabric and the fi ndings have been compared with wet-on-wet method (commercial). In dry-on-wet method, by using 100 litres of fi nishing liquor, it is estimated that nearly 143 kg of dry fabric could be fi nished by each fi nishing formulations with 70 % expression, while in wet-on-wet method by using 100 litres fi nishing liquor nearly 500 kg wet fabric can be fi nished, since it took 20 % expression of fi nishing liquor Fig. 25 Flexural rigidity of
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  • Fall '19
  • N. Gokarneshan

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