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The use of reflectance measurements in the determination of diffusion of reactive dyes into cellulosic fiber
Author(s) -
Khatri Awais,
White Max,
Padhye Rajiv,
Momin Nasar H.
Publication year - 2014
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.21764
Subject(s) - dyeing , diffusion , fiber , yield (engineering) , cellulosic ethanol , reactive dye , diffusion equation , cellulose fiber , materials science , disperse dye , reflectivity , chemistry , chemical engineering , composite material , optics , thermodynamics , organic chemistry , cellulose , physics , economy , engineering , economics , service (business)
Reactive dye fixation and color yield of a dyed cellulosic fiber significantly depend on the dye diffusion into the fiber polymer system. In case of pad‐dyeing processes, dye diffusion exerts a more significant influence on dye fixation and hence color yield. This article proposes a new method for determining the extent of diffusion of reactive dyes into the fiber in pad dyeings using Kubelka–Munk equation. The K/S values are used as in an equation, %D (extent of dye diffusion) = 100 − [(K/S diffusion index )/ (K/S reference ) × 100]. The article introduces and explains how to determine the new K/S variables used in this equation. The new method is simple, nondestructive, relatively faster, and applicable to industrial dyehouses, and was validated by a microscopic analysis of dyed fiber cross‐section carried out in this work and to the dye manufacturer's recommendations for dyebath‐ingredient concentrations. © 2012 Wiley Periodicals, Inc. Col Res Appl, 39, 63–69, 2014