NOPR Collection:

Bulk and physical properties of needle-punched nonwoven fabrics

Wed, 01 Jun 2005 00:00:00 GMT

Title: Bulk and physical properties of needle-punched nonwoven fabrics Authors: Midha, Vinay Kumar; Mukhopadyay, A Abstract: Bulk and physical properties of needle-punched nonwoven fabric depend on the nature of component fibre, the manner in which the fibres are arranged in the structure and the degree of consolidation . A proper understanding of the role of different parameters on fabric properties is important for designing the fabric suitable for its use. Normally, the longer and finer fibre in the web leads to greater fabric strength, provided the fibre breakage is controlled. The increase in needle densityand penetration improves the fibre consolidation. but beyond a certain limit the fibre damage becomes greater, leading to deterioration in fabric characteristics. Higher fabric weight and introducti on of scrim generally improve the functional properties of fabric. Finishing operation is opted in the cases where some special requirements are to be fulfilled. This paper is intended to develop some understanding about the bulk and physical properties in relation to raw material, machine parametersand process variables. Page(s): 218-229

Properties of indigenous angora rabbit hair and cotton blended yarns spun using shortstaple cotton spinning system

Wed, 01 Jun 2005 00:00:00 GMT

Title: Properties of indigenous angora rabbit hair and cotton blended yarns spun using shortstaple cotton spinning system Authors: Chattopadhyay, S K; Bhaskar, P; Ahmed, M; Gupta, N P; Pokharna, A K Abstract: The possibilities of producing cotton and indigenous angora rabbit hair blended yarns by adopting commercial cotton spinning system working on economical production speeds have been explored. It is observed that as the proportion of hair fibre in the blend increases, the yarn properties of both the single and double yarns deteriorate, mainly due to the lower fibre strength and inter fibre cohesion of hair fibres. Page(s): 215-217

Effect of some ring spinning and winding parameters on extra sensitive yarn imperfections

Wed, 01 Jun 2005 00:00:00 GMT

Title: Effect of some ring spinning and winding parameters on extra sensitive yarn imperfections Authors: Basu, Arindam; Gotipamul, Rajanna Abstract: The effect of various ring spinning parameters and winding machine parameters on the yarn quality has been studied at higher sensitivity levels using the capacitance type tester. The relationship between extra sensitive imperfections and infrequent yarn faults has also been studied. It is observed that the spacer size, break draft and spindle speed of ring frame influence the imperfections and classimat faults. With the increase in twist multiplier the yarn quality improves initially and after a certain stage there is an increase in imperfections with increased twist multiplier. Within the chosen limit the effect of winding speed and tension weight of high speed autoconer on imperfections is minimal. Page(s): 211-214

Study on superabsorbent polyacrylonitrile-based fibre

Wed, 01 Jun 2005 00:00:00 GMT

Title: Study on superabsorbent polyacrylonitrile-based fibre Authors: Hu, Xiaoyu; Xiao, Changfa Abstract: Superabsorbent polymer fibres with maximum water absorbency were produced using acrylonitrile and methyl methacrylate as monomers, N-hydroxymethyl acrylamide as potential cross linking agent, dimethyl sulfoxide as solution and azo-bisisobutyronitrile as initiator. The copolymer solution was then spun using dry-wet spinning method with water as coagulation bath. The fibres thus produced were heated to get crosslinking structure and their surfaces were hydrolyzed by alkaline solution. The influence of hydrolyzing conditions, such as temperature and concentrations of alkaline solution and N-hydroxymethyl acrylamide,on the fibre structure and properties was also studied using FTIR, DSC, DMA and SEM techniques. The changes in storage modulus, Tg and surface structures of fibres were also studied. The superabsorbent polymer of about 40g/g water absorbency was obtained using N-hydroxymethyl acrylamide concentration of equal to about 10wt%monomer, alkali concentration of about 15wt% and hydrolyzing time of about 5 min. Page(s): 207-210