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Title: Non-aqueous color fading effect on cotton with industrial application
Authors: Cheung, Hing Fu Channal
Degree: Ph.D.
Issue Date: 2018
Abstract: This project was conducted under the "Teaching Company Scheme", and the aim of this study was to investigate an eco-methodology, "atmospheric pressure plasma" (ozone) treatment for non-aqueous color fading effect on cotton with industrial application. "Atmospheric pressure plasma" (ozone) technology harnesses the natural bleaching capabilities of ozone gas to give a range of overall and specialty bleach effects with substantially reduced environmental impact. Among many sustainability technologies in the garment industry production process, ozone can be used to clean back-staining from normal washing processes, or to bleach down to a lighter shade, the shade depends on the parameter, it includes gas concentration, moisture content and treatment time, etc. Different parameters combinations generate different degree of color fading. Other than bleaching chemical, the water use reduction is an additional benefit achieved on this study. While the production process contains chemical bleaching or stonewashing, six to seven wash and rinse cycles are gone through. But finishing treatment by ozone will only require two to three cycles. Meanwhile, the conventional finishing applications require an amount of water, sometimes with the desirable temperature for wet finishing which can be replaced by ozone. Therefore, the "atmospheric pressure plasma" (ozone) technology for fading color application could replace some traditional finishing steps with reduces effluent, including the sludge that pumice stones create. The ozone technology can benefit the industrial laundry production in the new era, especially on fading color application. To obtain atmospheric pressure plasma (ozone), oxygen is one of the key elements. The purity of oxygen (O2) will directly affects the ozone concentration produced by the ozone generator, as well as the time on ozone generating. In the G2 waterless washing machine, the built-in oxygen generator can generate power which is enough to supply 96% of pure oxygen. The G2 machine is designed for sampling and bulk production. Therefore, it sets up a preliminary control table for samples versus the bulk production application. Experimental work was carried out to study the relationship between the combinations of the processing parameters, i.e. dye concentration, treatment time, gas concentration and fabric moisture content on the color fading effect induced by atmosphere pressure plasma. Research specimens were gone through a series of analytical studies on color measurement, which were evaluated by use of CIE LAB colorimetric system, K/S sum values, reflectance curve (R%), color levelness (RUI), CIE L*, a*, b* values and ΔE. The results showed that the degree of color fading effect had positive correlation by adjusting the processing parameters. These data would be used for industrial reference on the application to reduce the variance for the desired color fading effects.
Subjects: Hong Kong Polytechnic University -- Dissertations
Cotton fabrics
Dyes and dyeing
Pages: 162 pages : color illustrations
Appears in Collections:Thesis

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