吸水性衛生用品における吸収体の熱移動特性 Heat Transfer Properties of Absorbent Cores in Water-absorbing Hygiene Products
Wetness-induced changes in the heat transfer properties of composites for water-absorbing hygiene products, such as disposable diapers, were investigated to evaluate their performance in use. The heat transfer properties of composites rose markedly after being moistened with the solution equivalent to the typical amount of urine produced in one wetting by a 1-year-old baby. The maximum value of the heat flux (<i>q<sub>max</sub></i>) of the composites increased by approximately 2.5 times after wetting, while the value of thermal conductance (<i>K</i>') increased by approximately 1.4 times. The heavier composites containing a large quantities of absorbent materials had smaller values for water content, and showed smaller values for the <i>q<sub>max</sub></i> and <i>K</i>' measures. The absorbent cores contain pulp, tissue and super-absorbent polymers. The <i>K</i>' value of absorbent core in a wet condition was estimated from the following parameters; the <i>K</i>' value of the absorbent core in a dry condition; the effective thermal conductivities of the pulp fibers and water; the densities of the pulp fibers and water; and the moisture regain of the absorbent core. The effective thermal conductivities of fibers in the longitudinal and transverse directions were shown to be important measures when estimating the heat transfer properties of the composites.
- 繊維機械学会誌 = Journal of the Textile Machinery Society of Japan
繊維機械学会誌 = Journal of the Textile Machinery Society of Japan 57(9), T89-T94, 2004-09-25