Studies on the Foam Dyeing of Nylon Fiber with Disperse Dye

(Part 2) : Effect of Substrate Structure on the Liquid Flow in the Foam Dyeing

Abstract

In the foam dyeing of the nylon 6 substrate with disperse dye (C.I. Disperse Violet 1), the influence of the substrate structure on the liquid flow was investigated in terms of the thickness of diffusional boundary layer calculated by using Newman's equation.
1) In the foam dyeing of nylon 6 muslin at 80°C (air flow rate: 1 dm³ min^-1), coefficient of diffusion D_f=1.04×10^-8cm² min^-1, boundary layer parameter L=1.48, and thickness of diffusional boundary layer δ_D=10.4×10^-3cm were obtained.
2) The move of Plateau border in the foam dyeing exerts a large effect on the flow in the liquid phase on the surface of the fabric and the constituent yarn of the fabric. The downward flew of the liquid owing to the gravity becomes important regarding the liquid flow surrounding the individual fiber of the yarn.