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ThesisItem Open Access Delignification of Dhaincha (Sesbania aculeata) fibres for value addition with blending and development of union fabric(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-02) Bhatt, Pooja; Anita RaniThe natural fibres have dominated and coexisted with synthetic fibres in textile industry for long period of time. The alarming environmental concerns with increased used of synthetic fibres shifted research interest towards resources of natural and lignocellulosic fibres. The bast fibres have provided an opportunity to lead towards high quality textile market with economic and environmental benefits. Sesbania aculeata locally known as dhaincha has abundant possibilities in textile sector. It is only used for green manuring in Tarai region of Uttarakhand to enrich soil. The coarse nature and high lignin content limits use of dhaincha fibres in textile sector. Therefore, present study was planned to delignify dhaincha fibres to increase softness; spin yarns through blending with cotton and bamboo fibres and to prepare union fabrics from blended yarns. The dhaincha fibres were extracted using stagnant water retting method for 15 days. The variables for delignification i.e., acetic acid concentration, sodium chlorite concentration, sodium hydroxide concentration and sodium hydroxide treatment time were optimized using Box Behnken Design of RSM. The effect of independent variables on dhaincha fibres after delignification treatment was observed on lignin content, tenacity, moisture regain and whiteness index of fibres. The dhaincha fibres were delignified in bulk using optimized recipe for delignification treatment. The physical properties of fibres obtained after retting and delignification treatment were assessed to observe effect of delignification on properties of fibres. The delignified dhaincha fibres were blended with cotton and bamboo fibres in two ratios, 30:70 and 40:60 to develop blended yarns on computerized Trytex Rotor Spinning Machine. The union fabrics were prepared from the blended yarns in weft and cotton and bamboo yarns as warp respectively on handloom using plain weave. The developed yarn and fabric samples were tested for various physical and functional properties. The findings of study revealed that delignification treatment enhanced the softness and whiteness index of dhaincha fibres thereby, could increase economic viability and utility of the plant. The SEM images showed removal of lignin, hemicellulose and impurities and XRD analysis revealed decrease in crystallinity index of dhaincha fibres and increased amorphous regions in fibres after delignification. FTIR spectroscopy showed removal of lignin, hemicellulose and pectin to some extent after delignification. Rotor spun blended yarns were of low count, strength and yarn twist. Fabric properties were found to be affected by blending of dhaincha with cotton and bamboo fibres in different blend ratios. Blending increased thickness and weight in case of both dhaincha:cotton and dhaincha:bamboo woven union fabric samples. The union fabric samples exhibited good air permeability and wettability after blending of dhaincha fibres with cotton and bamboo. Tensile and tearing strength were found good in weft direction of prepared woven fabric samples due to high fabric count in weft direction. All union fabric samples exhibited low crease recovery and bending length than 100% cotton and 100% bamboo fabric samples. Thus, delignified dhaincha fibres and union fabrics developed from dhaincha, cotton and bamboo would offer diversified textile and might widen scope of use of plant for different value added products.
