Abstract
Nondimensional moisture concentration rates are determined across the bobbin cross section for different diffusion coefficients and geometrical structures of the bobbin as a function of time.
The large value for the ratio of the mass-transfer coefficient β at the package surface to the diffusion coefficient D of the bobbin yields a steep concentration gradient in the outer filament layers, provided no moisture equilibrium exists between the moisture concentration in the package and the surrounding atmosphere. Even in the case of small diffusion co efficients, the moisture content will differ in the layers at the ends of the bobbin and on the surface already after a short period of conditioning. These fluctuations can be the cause of an irregular dyeing of the filament yarn.
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