A technological study of computer-aided laser finishing on cotton-based fabrics

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A technological study of computer-aided laser finishing on cotton-based fabrics

 

Author: Hung, On Na
Title: A technological study of computer-aided laser finishing on cotton-based fabrics
Degree: Ph.D.
Year: 2016
Subject: Cotton fabrics.
Carbon dioxide lasers.
Lasers -- Industrial applications.
Hong Kong Polytechnic University -- Dissertations
Department: Institute of Textiles and Clothing
Pages: xxii, 282 pages : illustrations (some color)
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2864160
URI: http://theses.lib.polyu.edu.hk/handle/200/8443
Abstract: The purpose of the present study was to investigate the feasibility of applying the CO{208} laser technology to modify the of physical, chemical and color properties of the woven cotton, woven cotton/polyester and knitted cotton fabrics in terms of technological, theoretical and experimental feasibility. The technological possibility of CO{208} laser technology in the textile industry was assessed through evaluating the physical, chemical and color performance of laser treated woven cotton, cotton/polyester and knitted cotton fabrics with two different approaches, i.e. (1) laser treated and then dyed (LD), and (2) dyed first and then laser treated (DL) together with combinations of laser processing variables. It was confirmed that pores and cracks were formed on the laser-treated cotton fibers with their sizes varying with the change of laser power. The change occurred in the cotton/polyester blended fabrics was found different from that of the cotton fibers as they were covered by the melted polyester with uneven flat regions being created. In addition, the yarn count and yarn twist were also found affecting the result of laser treatment in the knitted fabrics. Higher number of pores was found on the yarns with higher yarn count and lower yarn twist. The physical properties of the laser-treated fabrics were altered. Cotton woven fabrics were observed to have better drapability and wrinkle recovery after laser treatment. Stiffness was enhanced after treating the cotton/polyester blended woven fabrics with laser. It was discovered by the FTIR that the hydroxyl groups of the irradiated fabrics were removed after laser treatment. This really could help explain the color fading effect obtained by the laser treatment. In comparison with two different treatment approaches, there were various responses to different textile materials, dyestuffs and density of the laser power used. The DL approach provided a stronger color fading effect when the Reactive Blue 19 was used in the cotton fabrics. As for the cotton/polyester blended fabrics, the LD approach supported a stronger color fading effect when the same dyestuff was used. Different desired effects were successfully obtained using various treatment approaches, treatment setting and textile materials. In conclusion, there is a considerable potential to improve the existing value-added finishing using the CO{208} laser in textile industry with less time, water consumption and cost. However, the textile and color properties of the laser-treated materials are also critical to the finishing effects that can be achieved on the cotton and cotton/polyester blended fabrics.

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