In the foam dyeing of nylon 6 muslin fabric with disperse dye (C. I. Disperse Violet 1), the influence of air flow rate on the following foam properties were investigated: the foam flow rate, dye concentration in the foam film, the blow ratio, diameter of the bubble, and the number of the moving bubbles.
The dye concentration in the foam film decreased by the air flaw rate increase; the dye adsorption at equilibrium was not depressed. In addition, the increase of the air flow rate raised the foam flow rate and the number of the bubbles and/or Plateau borders, that transported on the substrate. These bring about the liquid flow around the substrate, and depressed the thickness of diffusional boundary layer.
In the foam dyeing, therefore, the increase of the air flow rate brings about the good dye ability in the terms of dyeing rate without affecting the equilibrium state.
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