NOPR Collection:

Extension and recovery characteristics of air-jet textured yarn woven fabrics

2004-03-01T00:00:00Z

Title: Extension and recovery characteristics of air-jet textured yarn woven fabrics Authors: Mukhopadhyay, A; Nayak, R K; Kothari, V K Abstract: Fabric extension and recovery characteristics in relation to the fabric fractional cover, nature of weft yarns (air-jet textured yarn/spun yarn), doubling of single yarn and filament fineness in air-jet textured yarn have been analysed. It is observed that the spun yarn fabric shows better dimensional stability and shape retention property in terms of higher immediate recovery and resiliency, and lower delayed recovery and permanent set as compared to the textured yarn fabric. Single yarn fabric possesses greater immediate recovery and resiliency along weft direction as compared to doubled yarn fabric. The finer filament textured yarn fabric shows lower immediate recovery and resiliency than that of the coarser filament textured yarn fabric. Page(s): 62-68

Optimization of speed frame process parameters for better yarn quality and production

2004-03-01T00:00:00Z

Title: Optimization of speed frame process parameters for better yarn quality and production Authors: Ishtiaque, S M; Rengasamy, R S; Ghosh, A Abstract: The influence of flyer speed, top roller pressure and size of middle condenser in the drafting region on various characteristics of roving and yarn has been studied. The Box and Behnken factorial design has been used to optimize these speed frame machine variables. In each case, the optimum conditions within the industrially acceptable limits of the process are established. It is observed that the flyer speed higher than 1040 rpm and the top roller pressure higher than 2.2 kg/cm² are not suitable within the experimental zone explored. The optimum middle condenser width is found to be 8 mm with the present experimental set-up. Page(s): 39-43

Effect of add-on finish and process variables on recovery properties of jet-spun polyester yarns

2004-03-01T00:00:00Z

Title: Effect of add-on finish and process variables on recovery properties of jet-spun polyester yarns Authors: Tyagi, G K; Singh, Amarjot; Goyal, A Abstract: The influence of add-on finish and process variables on the recovery properties of jet-spun polyester yarns has been studied using the Box-Behnken design. It is observed that the add-on finish plays a key role in determining the immediate elastic recovery of jet-spun polyester yarns which tends to increase with the increase in level of add-on finish. Immediate elastic recovery hardly alters with spinning speed but it increases significantly with the increase in both first nozzle pressure and main draft. Both delayed elastic recovery and permanent set, on the other hand, invariably decrease with increasing main draft, and are considerably lower for the yarns spun with higher add-on finish than for the yarns spun without finish. An increase in spinning speed increases the permanent set but adversely affects the delayed recovery. Page(s): 44-48

Fabric low-stress mechanical properties and drapability

2004-03-01T00:00:00Z

Title: Fabric low-stress mechanical properties and drapability Authors: Sharma, Kaushal Raj; Behera, B K; Roedel, H; Schenk, Andrea Abstract: The Cusick's drape meter has been modified and used to determine the accurate drape coefficient. The drape coefficient so obtained is then correlated with fabric low-stress mechanical properties. It is observed that the drape coefficient has strong correlation with bending properties, good to strong correlation with shearing properties and poor correlation with tensile properties. Page(s): 57-61