Heat Induced Color and Dyeability Changes in Raw Cotton

Donald E. Brushwood


 
ABSTRACT

Raw cottons have a tendency to discolor when they are heated even at moderate temperatures. Increases in yellowness occur and the cottons tend to dye lighter as heating temperatures and exposure times increase. The intensity of these effects may vary depending upon factors such as cotton maturity, degree of weathering, variety, and area of growth. Modern high production gins often use high temperatures to dry cottons because the time allotted for drying is short. Thus, the alteration of certain cotton characteristics such as color and dyeability during ginning is possible. Cottons of different maturity levels from several different growing areas were subjected to heating and drying conditions within the ranges of those encountered in gins, measured for color changes, and were dyed. The results of these experiments are reported.



Reprinted from 1990 Proceedings: Beltwide Cotton Production Research Conferences pp. 687 - 689
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998