Tanawat Ruangteprat
Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok 10120, Thailand
Somchai Udon
Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok 10120, Thailand
Jaruwan Diswat
Faculty of Industrial Textiles and Fashion Design, Rajamangala University of Technology Phra Nakhon, Bangkok 10300, Thailand
Jaratpim Wangyen
Faculty of Industrial Textiles and Fashion Design, Rajamangala University of Technology Phra Nakhon, Bangkok 10300, Thailand
Rattanaphol Mongkholrattanasit
Faculty of Industrial Textiles and Fashion Design, Rajamangala University of Technology Phra Nakhon, Bangkok 10300, Thailand
Hathaitip Srichompoo
Faculty of Industrial Textiles and Fashion Design, Rajamangala University of Technology Phra Nakhon, Bangkok 10300, Thailand
Jiramet Suparat
Textile Technology Division, Khon Kaen Industrial and Community Education College, Khon Kaen 40180, Thailand
Krailerck Visesphan
Faculty of Industrial Textiles and Fashion Design, Rajamangala University of Technology Phra Nakhon, Bangkok 10300, Thailand
Environmental concerns over synthetic dyes, including water pollution and high energy demands, have driven interest in sustainable alternatives. This research investigates the colouration of polyamide 6 (nylon 6) textiles using a natural dye derived from the mature pods of Cassia fistula, which serve as a source of anthraquinone-based pigments. The study systematically evaluated the influence of dyeing parameters-namely temperature (30–90 °C), duration (10–60 min), pH range (4–11), dye concentration (10%–70% owf), and post-mordanting using alum, ferrous sulfate, and stannous chloride-on the resulting colour strength (K/S) and CIE Lab* coordinates. The fastness characteristics of polyamide 6 fabric were assessed, with the corresponding results detailed in the subsequent sections. Maximum dye absorption was achieved at 90 °C for 60 minutes under acidic conditions (pH 4), and from the conditions was given K/S 2.242. An increase in dye concentration led to higher K/S values, which were further augmented by mordanting, with aluminum potassium sulfate and stannous chloride yielding the greatest results. Colour fastness assessments indicated good to excellent resistance to washing, water exposure, rubbing, and perspiration, all of the properties were up to 4. Whereas resistance to light was found from 1 to 2. The findings confirm Cassia fistula extract as a renewable, eco-friendly dye for polyamide 6, offering commercially viable colour strength and fastness while supporting sustainable textile processing.
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Copyright © 2025 Tanawat Ruangteprat, Somchai Udon, Jaruwan Diswat, Jaratpim Wangyen, Rattanaphol Mongkholrattanasit, Hathaitip Srichompoo, Jiramet Suparat, Krailerck Visesphan
This is an open access article under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) License.
