The cylindrical cellophane-film roll was dyed with some direct dyes, under certain conditions (dye 0.02g, NaCl 0.4g, Noigen HC 0, 0.1, 0.2, 0.4, 0.8, 1.6g per 400cc of bath, temperature 90°C, dyeing period 25hr).
The cellophane-film roll was obtained by winding up the cellophane-film (6cm wide, 55cm long and 0.0042cm thick in wet state) around the glass tube of 0.9cm in diameter.
After dyeing, the dye concentration of each layer was determined colorimetrically. Assuming that the system is equivalent to the dyeing of a semi-infinite media (substrate) with constant dyebath concentration, the diffusion coefficient
D, surface concentration
Co, (proportional to the ammount of equilibrium adsorption) and “dyeing index”
Co√
D were obtained from the dyeing conditions above mentioned.
1) As the amount of Noigen HC increases, both
Co and
D for each dye decrease.
2) The higher the value of
Co of dyes is, the more remarkable is the effect on
Co.
3) As to the dyes with high value of
Co and very low value of
D, the effect on
Co√
D is slight.
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