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United States Department of Agriculture

Agricultural Research Service

Research Project: FIBER QUALITY MEASUREMENTS, PROCESSING EFFICIENCY AND END USE QUALITY Title: Relationship of Cotton Fiber Calcium and Magnesium Contents on Dye Uptake

item Gamble, Gary

Submitted to: American Association of Textile Chemists and Colorists Abstracts
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: December 8, 2010
Publication Date: September 30, 2011
Citation: Gamble, G.R. 2011. Relationship of Cotton Fiber Calcium and Magnesium Contents on Dye Uptake. American Association of Textile Chemists and Colorists Abstracts. 11(5). p. 74-79.

Interpretive Summary: Textile mills routinely encounter problems with dyeing of cotton fabrics, and not all of the factors influencing dye uptake on cotton are well understood. In this study, the calcium and magnesium contents of scoured cotton have been determined to have a significant impact upon how much dye is absorbed onto the fabric. Removal of these metals by using a sequestering agent can result in an increase, decrease, or no change in dye uptake, depending upon the specific dye being used. This observation will be useful to dyehouse operators in seeking more consistent results in their dyed cotton fabrics.

Technical Abstract: Cotton from a single bale was processed into knit fabrics and prepared for dyeing. Following scouring, fabrics were soaked in either a metal sequestering solution or a water solution, bleached and dyed using 5 dye shades from both reatice and direct dye classes. Results indicate that removal of residual Ca2+ and Mg2+ from the fabric results in significant changes in dye uptake and chroma values, though the 5 dyes do not follow the same trends. It is concluded that the chemical characteristics of individual dyes in part determine whether the metals will positively or negatively afftect dye uptake and chroma.

Last Modified: 5/23/2015
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