Study the effect of different dyeing conditions of extracted natural dye from leaves of neem on silk fabrics Nabawia A. Abdel-Zaher, Manal T.H. Moselhey and Osiris W. Guirguis Textile Metrology Lab, National Institute for Standards, Giza, Egypt Al-Safwa High Institute of Engineering, Cairo, Egypt Biophysics Department, Faculty of Science, Cairo University , Giza, Egypt Abstract: The aim of the present work was to evaluate the effect of artificial day light for 160 h on silk fabrics dyeing with different conditions such as; different dye bath pH values, different dyeing temperatures, and different dyeing times; of extracted natural dye from Azadirachta indica (neem) leaves. The reflectance spectra of the untreated and treated silk fabrics were followed using spectrophotometer technique. The effects of dyeing conditions in the optical parameters, such as; CIE tristimulus values, color parameters, absorption coefficient as well as extinction coefficient and color strength, were determined before and after exposure. The obtained results indicate that the silk fabrics were found to be highly dependent on either of these different dyeing conditions and/or artificial day light exposure. Also, variations in the values of the optical band gap energy were detected. Improvement in the dyeing process were produced which may be attributed to the induced structural change due to the variation in the chemical bonds in silk fabrics. The present work gives the chance to produce a new traditional natural dye to meet the environmental future demands technology of high quality fantastic dyed pattern. Keywords:Natural dye; neem plant; silk fabrics; dyeing conditions; optical properties. © 2018 ACG Publications. All rights reserved. |
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