NOPR Collection:

Effect of Mercerization on the Spiral Angle of Different Varieties of Cotton

Thu, 01 Dec 1977 00:00:00 GMT

Title: Effect of Mercerization on the Spiral Angle of Different Varieties of Cotton Authors: Iyer, K. R. Krishnlay; Patil, B.; Nachane, R. P. Abstract: X-ray angle (φ) and birefringence values (Δ n) of eight carieties of cotton were measured before and after subjecting them to swelling and stretching treatments in NaOH. Although the cottons represent a wide range of φ and Δ n in the untreated state, the differences narrow down considerably as a result of deconvolution accompanying slack mercerization, suggesting that convolutions account for a large part of the orientation differences found among raw cottons. However, the residual differences in φ and Δ n among the slack swollen samples were significant and were found to persist at all levels of stretch, indicative of distinct varietal differences in the spiral angle. Page(s): 129-130

Quality Evaluation of Commercial Jute and Mesta Fibres on Regional Basis

Thu, 01 Dec 1977 00:00:00 GMT

Title: Quality Evaluation of Commercial Jute and Mesta Fibres on Regional Basis Authors: Sinha, M K; Chatterjee, U Abstract: The results of a 5 year (1968-72) fibre quality survey work on commercial grades of white jute, tossa jute and mesta from different jute growing districts in India are discussed. State-wise, (i) Orissa ranks highest in white jute followed by Assam, West Bengal and Tripura, (ii) Tripura and Assam produce tossa jute with the best fibre characters, Orissa and West Bengal next, (iii) in mesta , West Bengal ranks highest among the states covered, except Madhya Pradesh. Areas producing low quality jute have been identified for launching of quality improvement programmes. Page(s): 122-128

Infrared Studies on the Mechanism of Reactions between THPC-based Fire Retardant and Cellulose Powder

Thu, 01 Dec 1977 00:00:00 GMT

Title: Infrared Studies on the Mechanism of Reactions between THPC-based Fire Retardant and Cellulose Powder Authors: Gupta, Jagdish Chandra; Lal, Krishan; Bhatnagar, Hari L Abstract: The reaction between cellulose powder and tetrakis (hydroxymethyl) phosphonium chloride has been studied under different conditions of pH and thermal curing using the infrared technique. The data obtained have been analyzed and compared with those for the reactions between cellobiose, THPC, thiourea and ammonium dihydrogen orthophosphate. The data have been used for understanding the mechanism whereby THPC-based [formulations impart flame-resistant characteristics to cellulose. Page(s): 119-121

THPC - Thiourea Flame-Retardant Finish for Cotton Textiles

Thu, 01 Dec 1977 00:00:00 GMT

Title: THPC - Thiourea Flame-Retardant Finish for Cotton Textiles Authors: Sharma, J. K.; Lal, Krishan; Bhatnagar, Hari L. Abstract: A new formulation based on tetrakis (hydroxymethyl)-phosphonium chloride (THPC), thiourea and small amounts of ammonium dihydrogen orthophosphate has been tried as an agent for imparting flame retardancy to cotton textiles. The effect of laundering on the tensile strength tear strength char length crease recovery, flex abrasion, air permeability and oxygen index of the treated sample has been studied. The treated fabrics exhibit flame-retardant properties even after 30 launderings. The performance of the formulation les within the limits specified in ASTM standards. Page(s): 116-118