Abstract
The distribution in the diameter of the cross sections of cells in some flexible polyurethane foams was cleared. In addition the distribution in the diameters of the three-dimensional cells was estimated on the basis of Saltykov's theorem. As a result, the mean diameter of the cell cross sections showed a linear relationship with the mean diameter of the three-dimensional cells. It was confirmed that cell structure of the foam, which should have been analyzed taking into account of the three-dimensional shapes of the cells, was evaluated by analysis of the cell cross sections. The cell number which is measured for the equidimensional hexagonal model is closely related to the cell diameter, and is comparable with the cell number experimentally measured. By examining the relation between the cell diameter and the mechanical properties, a linear relationship was found between the hardness and the cell diameter.
