The results also showed that at 180 [degrees]C, except for 0 percent RH, the tangential shrinkage
stresses demonstrated similar correlation with MC at all other RH levels.
[D.sub.b] = basic density; [D.sub.d] = weight density; [B.sub.t] = tangential shrinkage
; [B.sub.r] = radial shrinkage; [B.sub.v] = volumetric shrinkage.
Our results showed that steaming caused slight radial and tangential shrinkage of the wood (Table 3).
The effects of previous drying and extractives on the radial and tangential shrinkage of outerwood, middlewood, and corewood of two sweetgum trees.
The wood from Mississippi wetwood trees had significantly greater volume shrinkage (29.6%), tangential shrinkage (17.1%), and less longitudinal shrinkage (0.5%) than did the wood from South Carolina wetwood trees (21.8%, 13.0%, and 0.6%, respectively) (Table 5).
Severe wetwood of Mississippi trees had the greatest difference between radial and tangential shrinkage consistent with its lowest TPG.
Both reductions in tangential shrinkage
and in radial shrinkage resulted in approximately 35 percent less in total shrinkage, T+R, in the RF/V kiln compared to that in the conventional kiln.
The reduction in the tangential shrinkage by the RF/V drying process was higher than that in the radial shrinkage, therefore, the difference between the tangential and radial shrinkage (the term T-R in Table 1) represents a very low value.
It should be noted that the differences between tangential shrinkage and radial shrinkage in the RF/V kiln (the term T-R in Table 1) were very low, which should result in a minimal occurrence of V-cracks [9,14].