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RISS 인기검색어
- 검색키워드
- 저자 : Vinay Kumar Midha (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Dynamics of lockstitch sewing process
( Vinay Kumar Midha ),( A Mukhopadhyay ),( R Chattopadhyay ) 복식문화학회 2013 服飾文化硏究 Vol.21 No.6
During high speed sewing, the needle thread is exposed to dynamic loading, short strike loading, inertia forces, friction, rubbing, force of check spring, bending, pressure, friction, impact, shock and thermal influence. The dynamic thread loading/tension alters throughout the stitch formation cycle and along its passage through the machine. The greatest tensile force occurs at the moment of stitch stretching, when the take up lever pulls for required thread length through the tension regulator. These stresses act on the thread repeatedly and the thread passes 50-80 times through the fabric, the needle eye and the bobbin case mechanism, before getting incorporated into the seam, which result in upto 40% loss in tensile strength of the sewing thread. This damage in the sewing thread adversely affects its processing and functional performance. In this paper, the contribution of dynamic loading, passage through needle and fabric, and bobbin thread interaction in the loss in tensile properties has been studied. It is observed that the loss in tensile properties occurs mainly due to the bobbin thread interaction. Dynamic loading due to the action of take up lever also causes substantial loss in tenacity and breaking elongation of cotton threads.
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Dynamics of lockstitch sewing process
Midha, Vinay Kumar,Mukhopadhyay, A.,Chattopadhyay, R.,Kothari, V.K. 服飾文化學會 2013 服飾文化硏究 Vol.21 No.6
During high speed sewing, the needle thread is exposed to dynamic loading, short strike loading, inertia forces, friction, rubbing, force of check spring, bending, pressure, friction, impact, shock and thermal influence. The dynamic thread loading/tension alters throughout the stitch formation cycle and along its passage through the machine. The greatest tensile force occurs at the moment of stitch stretching, when the take up lever pulls for required thread length through the tension regulator. These stresses act on the thread repeatedly and the thread passes 50-80 times through the fabric, the needle eye and the bobbin case mechanism, before getting incorporated into the seam, which result in upto 40% loss in tensile strength of the sewing thread. This damage in the sewing thread adversely affects its processing and functional performance. In this paper, the contribution of dynamic loading, passage through needle and fabric, and bobbin thread interaction in the loss in tensile properties has been studied. It is observed that the loss in tensile properties occurs mainly due to the bobbin thread interaction. Dynamic loading due to the action of take up lever also causes substantial loss in tenacity and breaking elongation of cotton threads.
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Durability of fluoropolymer and antibacterial finishes on woven surgical gown fabrics
Vinay Kumar Midha,Ravikant Vashisht,Varsha Midha 한국의류학회 2014 Fashion and Textiles Vol.1 No.1
Commercially available polyester, polyester-cotton and cotton plain woven fabrics of 150 g/m2 weight and cotton woven fabric samples of 200 g/m2 weight with plain, twill and satin weave were studied for their suitability as surgical gowns. Water repellent and anti bacterial finishes were applied in single bath using pad-dry-cure method with four concentration levels of these finishes. Liquid barrier properties of samples were analyzed by water impact penetration and hydrostatic pressure test. Parallel streak method was used to measure the antibacterial activity on the fabric samples with Staphylococcus aureus. The fabric samples were also analyzed for air permeability and stiffness. Optimum concentration level of fluoropolymer and antibacterial finishes for achieving desired liquid barrier and antibacterial properties were determined for each fabric samples. Fabric samples were subjected to repeated laundering cycles to evaluate the durability of finishes. It was observed that polyester fabric samples and 200 g/m2 cotton twill woven fabrics show highest level of liquid barrier protection of Level 2 according to Association for the Advancement of Medical Instrumentation (AAMI) standards, with 4% and 7% fluoropolymers. The fabrics maintain their barrier protection upto 20 laundering cycles, whereas 100% cotton fabric samples show minimal liquid barrier protection and do not provide Level 2 protection even at 4% and 7% fluoropolymer.
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