Binding Performance of Binder (III)

Tightness of Bound Sheaf

Abstract

In this paper, the validity of specific value P calculated by the expression (1) was discussed by the use of the data obtained by the Experiment I.
The results are as follows.
(1) The correlation matrix of the fifteen kinds of variables concerned with the binding properites of sampled sheaves was calculated and analyzed (Table 2).
(2) From the relationship between K_T/W (remaining rate of T/W) and the water contents of sheaf with natural indoor drying, it seemed that the deformation and stress relaxation of straw became large in evaporated condition in the same way as the wood (Fig. 3).
(3) The negative correlations were recognized for T₁/W₁ in three kinds of sheaf size at 1% of significance level. And by the regression analysis it appeared that the big and middle sized sheaves were more tightened than the small sized sheaves (Fig. 5).
(4) The value of √1+β²·T₁/L related P₁ which was a specific value P just after the binding of sampled sheaf was considered and analyzed by the use of variance analysis. Its value was affected not only by the sheaf sizes (Factor C) but also the kinds of twine (Factor F) and the physical properties of straw (Factor R) (Table 4).
(5) The specific value P₁ was calculated by the value of √1+β²·T₁/L and the apparent width of twine from the expression (1) and was analyzed by variance analysis (Table 5).
(6) The interval estimation of mean values of P₁ expressing the tighuness of bound sheaf were obtaind as follows.
The big sized sheaf for the twine P1 and P5, P₁=1.08-0.78 (kg/cm²).
The big sized sheaf for the twine J2 and the middle sized sheaf for the twine P1, P5 and J2, P₁=0.80-0.50 (kg/cm²).
The small sized sheaf for the twine P1, P5 and J2, P₁=0.54-0.24 (kg/cm²).