Abstract
We have discussed in our last report1) on the physical properties corresponding to the sensory value “body” of urethane foams, and reported that gradient of compressive stress in the second linear part on S-S curves and elastic modulus of compression have a high correlation to the sensory value.
In this paper, the relation between sensory value “body” and multiple physical properties is presented statistically using a discriminant function analysis. Furthermore, the relation between “hardness” and “body”, which are generally confused, was discussed.
The results obtained as follows:
(1) The sensory value “body” is not so indistinguishable from “hardness” on the handling.
(2) The gradient of compressive stress in the first linear part on S-S curves (Young's Modulus) has resemblance with the sensory value “hardness”.
(3) The following linear discriminant function is given to “body” Z. Z=45.77VP(II)-12.35Mg Where Vp (II) is gradient of compressive stress in the second linear part on S-S curves and Me is the elastic modulus of compression.
(4) The correlation coefficient between the discriment function value (Z) and sensory value “body” are 0.973.
(5) The equation above shows that VP (II) is more affecting to the handling “body” of urethane foams than Me.
