Abstract
To understand the effect of alkali pre-treatment on the dyeing of lyocell fabrics, samples are pre-treated with 0.0–7.0 mol dm−3 NaOH using a pad-batch process and then dyed with different types of reactive dyes. Exhaustion, fixation, and visual colour strength (K/S values) are measured. It is observed that sodium hydroxide pre-treatment significantly improves the colour yield, exhaustion, and fixation for all dyes used. Highest K/S values are obtained when the fabrics are pre-treated with 2.0–2.5 mol dm−3 NaOH. Cross-sectional analysis shows that below this optimum concentration the core fibres in the yarn are not dyed; at optimum concentration all fibres in yarn cross-section are homogeneously dyed. Cross-sectional analysis shows that as the pre-treatment concentration of NaOH increases above 2.5 mol dm−3, the fibres change progressively from a circular to angular cross-section, forming a solid unit. The decrease in K/S above the treatment concentration of 2.5 mol dm−3, though the %E and %F remains almost constant, is attributed to the distribution of dye over a larger surface area of the outer fibres in the yarn cross section, forcing the K/S at λmax to decrease.
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The authors would like to thank Lenzing AG and The UK Government (Overseas Research Scholarship Awards Scheme) for the provision of a PhD scholarship to Mr. Goswami.
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This paper was presented at the 2nd International Cellulose Conference, Tokyo, Japan, 24th October 2007.
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Goswami, P., Blackburn, R.S., Taylor, J. et al. Dyeing behaviour of lyocell fabric: effect of NaOH pre-treatment. Cellulose 16, 481–489 (2009). https://doi.org/10.1007/s10570-009-9279-z
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DOI: https://doi.org/10.1007/s10570-009-9279-z