1992 Volume 43 Issue 11 Pages 1125-1131
By Missouri Type Simulator, dynamic water vapor transports in transient state were investigated for surface modifications (to hydrophilic or hydrophobic) fabrics made of polyester, acrylic, cotton and wool fibers.
In the case of water vapor (insensible perspiration), the water vapor absorption characteristic of fibers seems to be the most important factor which determines the water vapor transport rate. The surface modification does not influence the water vapor transport rate, because water vapor transports through air space between fibers, and is absorbed bulk of fibers.
In the case of sweating, which liquid water contact the first layer of fabrics, the wicking or liquid water absorbing characteristic of the first fabric layer is the dominant factor which determines the water vapor transport behavior of a layered fabric system. By spreading out liquid phase water in a wider area and depth quickly, dissipation of water is accelerated. Therefore the surface modifications of fabrics significantly alter water vapor transport properties.
