http://nopr.niscair.res.in/handle/123456789/13658 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/15234 Title: <span style="font-size:13.0pt;mso-bidi-font-size: 10.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Antimicrobial effectiveness of <i style="mso-bidi-font-style:normal">Vitex negundo</i><span style="mso-bidi-font-style:italic"> leaf extracts</span></span> <br/> <br/>Authors: Mohanraj, S; Vanathi, P; Sowbarniga, N; Saravanan, D <br/> <br/>Abstract: Methanol and water extracts of the leaves obtained from <i style="mso-bidi-font-style:normal">Vitex negundo</i> plant have been applied on to the textile materials and its antimicrobial effectiveness is assessed against Gram negative and Gram positive bacteria. Extracts of <i style="mso-bidi-font-style:normal">Vitex negundo</i> leaves show antimicrobial efficacy even after multiple washes of the samples and, against perspirations of both acidic and alkaline <i style="mso-bidi-font-style:normal">p</i>H values without any significant increase in the fabric stiffness. Samples treated by exhaustion method exhibit the bactericidal effect while microcapsules treated samples exhibit the bacteriostat effect. The extracts of leaves can potentially be used for controlling the proliferation of microbes and for finishing of fabrics for antimicrobial effectiveness. <br/> <br/>Page(s): 389-392 http://nopr.niscair.res.in/handle/123456789/15233 Title: Performance characteristics of viscose ring and air-jet spun yarns as a consequence of draw frame speed and its preparatory process <br/> <br/>Authors: Tyagi, G K; Shaw, S <br/> <br/>Abstract: The influence of high speed draw frame and its preparatory process variables on the performance potential of viscose ring and MJS yarns has been studied. The data indicate marked differences in the performance of the yarns produced with different card drafts and the yarns made with high card draft display poor structural integrity, low abrasion resistance and more hairiness than the yarns spun under identical conditions but with lower card draft. Increasing second nozzle pressure greatly enhances structural integrity, compressional resilience and abrasion resistance, but reduces compressional energy and hairiness. The magnitude of change in these characteristics, however, is highly dependent on the yarn linear density and card draft. High draw frame speed is imperative for air- jet spinning if adequate wrapper fibres are to be produced, and the best one will, in practice, depend on the spinning parameters used. The behaviour of MJS yarns is noticeably better in many respects. <br/> <br/>Page(s): 337-342 http://nopr.niscair.res.in/handle/123456789/15232 Title: A preliminary investigation on kapok/polypropylene nonwoven composite for sound absorption <br/> <br/>Authors: Veerakumar, A; Selvakumar, N <br/> <br/>Abstract: The use of kapok fibre with polypropylene fibre for the development of sound absorptive nonwoven materials has been explored. Three different blend ratios of kapok and polypropylene fibres, namely 30:70, 40:60 and 50:50 have been used. The composites are characterized for their physical properties, namely thickness, density, porosity and sound absorption characteristics in the frequency range 250 - 2000 Hz. The values of sound absorption coefficient and noise reduction coefficient obtained indicate that the kapok fibre composites possess very good sound absorption behaviour in the entire frequency range. The uncompressed kapok/polypropylene nonwoven composite of 30:70 blend ratio with high bulk density and low porosity is found to give the best performance when used by providing air gap behind the composite. <br/> <br/>Page(s): 385-388 http://nopr.niscair.res.in/handle/123456789/15231 Title: Polyfunctional finishes on cotton textiles <br/> <br/>Authors: Sunder, A Edwin; Nalankilli, G <br/> <br/>Abstract: <span style="font-size:9.0pt;mso-bidi-font-size: 11.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:hi"="" lang="EN-GB">The present study is aimed at imparting polyfunctional finishes on 100% cotton fabrics using polycarboxylic acids (PCAs) that are capable of crosslinking with cellulose. Polycarboxylic acids, such as maleic acid, itaconic acid, citric acid and tartaric acid, have been selected and applied in single and in combinations on 100% cotton fabrics using pad- dry- cure process. PCAs treated samples are then tested for functional properties as per international standards. The crease recovery behaviour of these samples has been found to improve almost to the same extent and in some cases more than that of resin treated control sample. However, the strength loss is found to be lower for polycarboxylic acids treated samples. Flexural rigidity is also recorded very low. Soil release properties are improved by this treatment to attain the maximum grade of 5 from grade 3 for untreated sample. Reduction in dimensional changes is found negligible. Formation of ester crosslinks between cellulose and polycarboxylic acids has been confirmed through FTIR spectroscopic studies. It is found that the PCAs selected for the study could impart multiple functional properties on cotton. When applied in single, maleic acid and itaconic acid provide better results than the other two PCAs, whereas in combination, citric acid with other PCAs provides synergic effect in imparting functional properties. </span> <br/> <br/>Page(s): 364-371