NOPR Collection:

Structure and Strength of Hibiscus panduraeformis - A New Natural Fibre

Sun, 01 Mar 1987 00:00:00 GMT

Title: Structure and Strength of Hibiscus panduraeformis - A New Natural Fibre Authors: Chand, Navin; Phakka, Seema; Agrawal, P; Tiwari, S D N; Rohatgi, P K Abstract: Method of extraction, microstructure and physical properties of the fibre from the so far unutilized weed Hibiscus panduraeformis (Hindi: Ban Bhindi) are reported. The ultimate tensile strengths (UTS) of water-extracted and alkali-extracted fibres were 476.1 and 443.3 MN/m² with SD in UTS of 211.6 and 201.8 respectively, at a cross-head speed of 0.02 m/min. The moduli of water-extracted and alkali-extracted fibres were 35-40.7 and 31.9 GN/m² respectively, which are comparable to those of banana and pineapple fibres. Physical and structural properties of the fibre are compared with those of other natural fibres. Page(s): 53-55

Influence of Medullated Fibres on Mechanical Processing and Product Performance

Sun, 01 Mar 1987 00:00:00 GMT

Title: Influence of Medullated Fibres on Mechanical Processing and Product Performance Authors: Gupta, N P; Patni, P C; Arora, R K; Singh, U S Abstract: Two wools, non-medullated and medullated, were blended in different proportions to study the influence of medullated fibres on processing performance and product quality. Carpet pile, blanket and hand-made felt produced from the blended yarns were evaluated for performance. The processing loss increased and yarn strength gradually decreased with increase in the proportion of medullated fibres. The presence of medullated fibres improved resilience, visual appeal and handle of the carpet, while compressibility was retained. However, a compromise of these characteristics with abrasion resistance must be sought while selecting a wool mix for carpet manufacture as abrasion loss and intensity of chalky whiteness increase with increase in the proportion of medullated fibres. The warp- and weft-way breaking strengths of blanket fabrics decreased with increase in the proportion of medullated fibres. The strength weight factor of handmade felts decreased with increase in the proportion of medullated fibres, though the thickness improved. The minimum reasonable area density forfeit production was 700 g/m²; below this the felts showed poor abrasion resistance. Page(s): 46-52

Influence of Twist and Thermal Treatments on Characteristics of Acrylic-Polypropylene Blended Yarns

Sun, 01 Mar 1987 00:00:00 GMT

Title: Influence of Twist and Thermal Treatments on Characteristics of Acrylic-Polypropylene Blended Yarns Authors: Tyagi, G K; Malik, A P; Lal, A; Jindal, B M Abstract: Yarns spun from a majority of polypropylene fibres showed high strength and low extension. The yarn breaking strength tended to increase after boiling-water treatment. Thermal treatments had no significant effect on either unevenness or imperfections. Boiling-water treatment caused a higher yarn residual shrinkage than heating at various temperatures. Page(s): 40-45

Spinnability of Jute Fibres with Special Reference to Bleached Jute

Sun, 01 Mar 1987 00:00:00 GMT

Title: Spinnability of Jute Fibres with Special Reference to Bleached Jute Authors: Datta, U; Roy, T K Guha; Chatterjee, S; Ghosh, U K; Sikdar, B Abstract: The changes in jute fibre properties at various degrees of bleaching are reported. The changes in processing parameters, found necessary during semi-bulk and bulk trials in the mills, along with the limitation in spinnability of jute, are discussed. Up to 3% concentration of H₂O₂ there was no problem in spinning, only higher twist was necessary. Above this, the bundle tenacity of fibre decreased rapidly and hence adjustments in carding and spinning were essential. For efficient spinning the limiting value of bundle tenacity was 13 g/tex. Page(s): 36-39