Effect of Maturity on Reflectance Percentage of Bleached and Dyed (Reactive Dye) Cotton Fibre

Abstract

Maturities of five cotton fibre samples were measured in Hazi Hashem Spinning Mills Ltd, Narayongonj, Bangladesh on 21 July, 2011. Scouring, bleaching and dyeing of these cotton samples were performed in Delta Knit Composite Ltd., Gazipur, Bangladesh on 30 July, 2011. Reflectances of bleached and dyed samples were measured in Cotton Club (BD) Ltd, Gazipur, Bangladesh on 31 July 2011. It was found that with the increase of maturity, the reflectance percentage of both the bleached and dyed cotton fibres were increased up to a certain value then again decreased for comparatively high matured fibres. The increase of reflectance % are due to the increase of cellulose content in the primary and secondary cell wall whereas lowering of reflectance % after a certain maturity may be due to the formation of interior layer (consisted of mineral salts and proteins) adjacent to the lumen thus reducing the relative amount of cellulose content per unit mass of fibers.