Abstract
In this study, various foaming conditions for a surface layer foaming process by means of a batch type forming process were examined, where saturation times and saturation temperatures of surface layer-foamed plastics thus formed were measured. While, the change of inner structures (cell sizes and foaming depth) with respect to saturation times and saturation temperatures observed. Thus, investigations were made as to the effect of these factors on the inner structures, as well as impact absorption characteristics of surface layer-foamed plastics and their light diffusion characteristics. As a result, following matters were clarified. The forming process of surface layer. foamed plastics has been established, where foaming depth and cell diameter are controllable. The knowledge on the effectiveness in impact absorption characteristics and optical characteristics of surface layer-foamed plastics were obtained.
