Prevention of open surface checks in dried lumber
1992
Hart, C.A. | Gilmore, R.C. | Wyatt, W.C. Jr
Three matched lumber stacks of 4/4 flatsawn white oak (Quercus alba) were used in forced air-drying and another three in a dehumidification kiln to study the effect of either fluctuating wet weather or a single controlled exposure to high humidity on the occurrence of surface checks remaining open after the subsequent kiln-drying. Depending upon the moisture content (MC) of the lumber at the time of exposure, the effect was either beneficial or disastrous. High humidity exposure when the lumber was above 22 percent MC increased the subsequent yields of rippings free of open checks by 5 and 6.1 percent over the yields (93.4% and 88.8%) for matched stacks not subjected to the high humidity. But exposure to either wet weather or high humidity when the lumber was well below 20 percent MC resulted in more than half of the available yield being lost to checks remaining open after kiln-drying.
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