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http://dx.doi.org/10.5764/TCF.2009.21.1.010

Dyeing Properties and Storage Stability of Leaf Powder Prepared from Dyer's Knotweed (I) - by Freeze Drying method -  

Shin, Youn-Sook (Dept. of Clothing & Textiles, Chonnam National University)
Son, Kyung-Hee (Dept. of Clothing & Textiles, Chonnam National University)
Yoo, Dong-Il (School of Applied Chemical Engineering, Chonnam National University)
Publication Information
Textile Coloration and Finishing / v.21, no.1, 2009 , pp. 10-20 More about this Journal
Abstract
The objective of this study is to investigate the efficacy of leaf powder colorants as substitutes for traditional fresh juice extract dyeing. Three kinds of leaf powder colorants were prepared by freeze drying method with or without deep freezing as pre-treatment: one powder colorant from fresh leaf juice with deep freezing; two kinds of powder colorant from fresh leaves with and without deep freezing. Their dyeing properties and storage stabilities were studied and compared with the traditional fresh juice extract dyeing. The presence of indigo in the powder colorants was confirmed by UV/Visible absorption spectra. They showed absorption peak at 602nm which was same with indigo absorption peak. Dyeing was done at low temperature around 6$^{\circ}C$. All three powder colorants produced B colors on silk fabrics, showing similar color to the one dyed traditionally with fresh juice extract. The powder colorants from leaves gave higher color strength than the powder from leaf juice. The powder colorant prepared from leaves with deep freezing was the most stable for long term storage as its color and color strength were not changed after 360 days. So, this was used for further dyeing to study the effects of concentration and repeat dyeing on color strength and colorfastness. Fastnesses to dry cleaning and rubbing were fairly good above 4 rating. Further study is needed to improve light fastness. It was concluded that the leaf powder colorant with deep freezing could be used as a substitute for traditional juice extract dyeing at all seasons.
Keywords
leaf powder colorant; traditional fresh juice extract dyeing; freeze drying; storage stability; colorfastness;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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