Effects of alkali and ultraviolet treatment on colour strength and mechanical properties of jute yarn

Abstract

In this study, jute yarns were treated with an aqueous alkali solution and ultraviolet light to improve dyeability. Ultraviolet light treatments were carried out at an air pressure of 1 atm, under water and vacuum, and all the samples were dyed with reactive dyes. Virgin samples and treated jute yarns were analysed by Fourier Transform–infrared spectroscopy. K/S values were determined by a reflective spectrophotometer and used to establish the fixation values and colour strength of the dyed samples. The tensile mechanical properties of the samples were also measured by a tensile testing apparatus and were compared with the virgin samples. Alkali treatment resulted in a reduction in carbonyl group concentration. However, atmospheric ultraviolet light treatment increased carbonyl group concentration. Dyeability and dye fixation values for atmospheric and underwater ultraviolet light‐treated samples increased. Furthermore, the loss of tensile strength for alkali‐treated samples was much greater than others (up to 50%) in comparison with ultraviolet light‐treated samples.

Study of dyeing properties of wool fabrics treated with microwave

“…The application of physical modification technology is an important means of reducing pollution, which can reduce dyeing and finishing wastewater discharge, use of chemical agents and shorten the process (Ahmed & El-Shishtawy, 2010;Chen, Fan, & Wang, 2007;Gao, Cui, Huang, Yang, & Lin, 2014;Haji, Mousavi Shoushtari, & Mirafshar, 2014;Ke, Yu, Xu, Cui, & Shen, 2008;Kozicki & Sąsiadek, 2012;Rao, Hu, Li, Xiong, & Cao, 2013;Xu & Zhang, 2013;Zolriasatein, Yazdanshenas, Khajavi, & Rashidi, 2012). Microwave modification technology is a new research direction for low energy consumption and low equipment requirement for textile processing (Haggag, El-Sayed, & Allam, 2007;Kale & Bhat, 2011;Kalia & Sheoran, 2011;Ramadan, EI Sayed, & Almetwally, 2012;Sun, Lin, & Bai, 2005).…”

A new method for determination of the relative colour strength of dye based on new colour depth formula. Part II: application to different batches of colourant

“…[1][2][3][4] In practical applications, the RCS is usually determined relative to that of a standard colourant. 5 The colour strength value, as the value for the determination of the RCS, 6,7 is commonly characterised by the colour depth formula, [8][9][10][11][12] such as K/S (the colour depth formula Kubelka-Munk, abbreviated as K/S). 13,14 The RCS is not a physical constant, it may be affected by the dyeing conditions, such as the concentration, application method, and so on.…”

“…In practical applications, the RCS is usually determined relative to that of a standard colourant 5 . The colour strength value, as the value for the determination of the RCS, 6,7 is commonly characterised by the colour depth formula, 8–12 such as K/S (the colour depth formula Kubelka–Munk, abbreviated as K/S ) 13,14…”