Abstract
The relation between the function of environmental humidity control (B-value) and the moisture sorption-desorption isotherm was mainly studied for the polyacrylic acid fibers having a ultra-high moisture content of 20 to 40wt%. The change of the moisture content of specimen (Δm) in a closed vessel under periodic change of temperature between T1 and T2 (T1<T2) was given as the difference between moisture contents along the moisture sorption isotherm at T1 and desorption isotherm at T2. Based on this fact, the relation curve between B-value and the weight of specimen for the volume of closed vessel(W0/V) calculated from the moisture sorption-desorption isotherm agreed well with the observed one. This means the fiber products having the desired B-value can be designed from the moisture sorption-desorption isotherm of the constituent fibers.
