Abstract
Radiation coefficients of textile fabrics and films are considered to be important in relation to their practical usages. These materials were subjected to the measurement on the apparatus previously reported. The radiation coefficient of cotton fabrics at room temperatures was 4.4 (kcal/m2•hr•°W4), a comparatively large value. In the measurement of apparent radiation coefficient of films of polypropylene and polyethylene terephthalate, it was found that the considerable thickness of the samples was neccessary to reach a certain radiation coefficient owing to the small absorption coefficient α (1/m) of the films. This kind of radiation is profoundly different from the surface radiation which is frequently encountered in ordinary substances.
