Sage Journals: Discover world-class research

Abstract

When the concentration distribution of an acid dye in multiple layers of a chemically modified wool fabric is investigated, the concentration distribution curves have a sigmoi dal shape. The adsorption isotherm is approximately described in terms of a Langmuir- type adsorption model. The dyeing rate curve shows the sorption delay during the initial stage of dyeing due to the diffusional boundary layer. We assume that the relationship between the diffusion coefficient D_f, dye concentration C, and constant α takes the form Df = D _f ⁰ exp(αC). The diffusion parameters are estimated in such a way that the experimental data fit the theoretical curve of the concentration distribution based on the diffusional boundary layer model. The surface concentrations of the dye in multiple layers do not depend on the dyeing time, and they equal the equilibrium uptake. The constant surface concentration is explained by the affinity of the dye to the fibers.

Get full access to this article

View all access options for this article.

References

Hampton, G.M. , and Rattee, I.D. , Surface Barrier Effects in Wool Dyeing, Part I: The Location of the Surface Barrier, J. Soc. Dyers Colour. 95, 396-399 (1979).

Joko, K. , Koga, J. , and Kuroki, N. , Effect of Solvent Treatment on the Dyeing Rate of Wool Fiber, Sen-i Gakkaishi 42, T224-230 (1986 ).

McGregor, R. , and Peters, R.H. , The Effect of Rate of Flow on Rate of Dyeing, I: The Diffusional Boundary Layer in Dyeing, J. Soc. Dyers Colour . 81, 393 (1965).

Medley, J. , and Andrews, M.W. , The Effect of a Surface Barrier on Uptake Rates of Dye into Wool Fibers, Textile Res. J. 29, 398 (1959).

Sasaki, H. , Kido, H. , and Karasawa, M. , Diffusion of a Disperse Dye in a Multiple Porous Membrane Assembly , Textile Res. J. 61, 266-272 (1991).

Sasaki, H. , and Morikawa, H. , Diffusion of an Acid Dye in a Multiple Porous Membrane Assembly, Textile Res. J. 62, 509-516 (1992).

Sasaki, H. , and Araki. H. , Effect of Yarn Density on Diffusion of p-Aminoazobenzene in Multiple Layers of Nylon Fabric, Textile Res. J. 63, 296-301 (1993).

Shibusawa, T. , Endo, T. , Kameta , Y. , and Rys, P. , Estimation of the Thickness of a Diffusional Boundary Layer by Analyzing the Rate of Dyeing Data and by Means of a Multiple Membrane Layer Method, Sen-i Gakkaishi 42, T671-T679 (1986).

Wang, H. , Self-Diffusion and Structure of Liquid Water, I: Measurement of Self-Diffusion of Liquid Water with Deuterium as Tracer , J. Am. Chem. Soc. 73, 51-513 (1951).

Dyeing Kinetics of CI Acid Orange 7 in Multiple Layers of a Chemically Modified Wool Fabric

Abstract

Get full access to this article

References