Enhancing the efficiency of hemp fiber dyeing with natural dyes: Indigo and lac


  • Jadsadaporn CHOUYTAN Division of Textile Technology, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok, 10120, Thailand
  • Rajapol THIRAWAT Division of Fashion Business Entrepreneurs, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok, 10120, Thailand
  • Dhea KHOTRADHA Division of Fashion Business Entrepreneurs, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok, 10120, Thailand
  • Tanawat RUANGTEPRAT Division of Fashion Business Entrepreneurs, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok, 10120, Thailand
  • Ing-orn SITTITANADOL Department of Metallurgical Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen, 40000, Thailand
  • Somchai UDON Division of Textile Technology, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok, 10120, Thailand




Hemp fibers, Natural dyes, Mercerization, Cationization, Fiber treatment, Indigo, Lac


Hemp fibers dyed with natural dyes are environmentally sustainable, but it is typically difficult to achieve an intense shade and washing durability. In this study, mercerization and cationization using polyelectrolyte, Poly-diallyldimethylammonium chloride (polyDADMAC), were chosen to enhance the dyeing efficiency and mechanical properties. Indigo and lac were chosen as natural dyes due to their widespread use. SEM demonstrated that untreated fibers contained the non-cellulose boundary layer on the surfaces, but after mercerization, the surfaces were smoother, making them suitable for absorbing natural dyes. In agreement with the FT-IR, the spectra of non-cellulose disappeared after mercerizing. Following cationization, the FT-IR spectra confirmed the consequences of using poly-DADMAC. Tensile testing demonstrated that mercerized hemp yarns were 34.1% stronger compared to untreated hemp yarns due to the decrease in non-cellulose content and that the intermolecular attraction of cellulose was not disturbed. The color strength and fastness properties were described by the K/S value. Mercerization considerably affected the K/S of indigo dyeing, while cationization affected lac dyeing significantly. Besides that, both treatments improved fastness properties as well.


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Author Biographies

Jadsadaporn CHOUYTAN, Division of Textile Technology, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok, 10120, Thailand

Dr. Jadsadaporn Chouytan, Lecture at Division of Textile Technology, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok, graduated with the Philosophy Degree (2019) and the Master's Degree (2017) in Polymer Science and Technology from Prince of Songkla University, Thailand, and graduated with the Bachelor's Degree in Engineering (2007) in Petrochemicals and Polymeric Materials, Silpakorn University, Thailand. Formerly the Research Fellowships (2017) at the School of Science and Technology, University of New England, Australia, and Postdoctoral Fellowships (2021) at Chulalongkorn University, Thailand. Proficient and interested in researching polymer science (radical polymerization), composite materials, natural rubber, and natural fibers.

Somchai UDON, Division of Textile Technology, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Bangkok, 10120, Thailand

Asst. Prof. Dr. Somchai Udon, Lecture at Division of Textile Technology, Faculty of Textile Industries, Rajamangala University of Technology Krungthep, Thailand, graduated with the Philosophy Degree (2015) in Integrated Product Design and Manufacturing from King Mongkut's University of Technology Thonburi, Thailand. The Master's Degree (2003) in Engineering Management from Kasem Bundit University, Thailand, and the Bachelor's Degree in Textile Chemical Engineering (1996) from Rajamangala University of Technology Krungthep, Thailand. Proficient and interested in researching fiber technology, dyeing technology, and sustainable materials.


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How to Cite

J. CHOUYTAN, R. THIRAWAT, D. KHOTRADHA, T. RUANGTEPRAT, I.- orn SITTITANADOL, and S. UDON, “Enhancing the efficiency of hemp fiber dyeing with natural dyes: Indigo and lac”, J Met Mater Miner, vol. 34, no. 2, p. 1873, Jun. 2024.



Original Research Articles