• Journal of the Korean Wood Science and Technology
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• v.14 no.3
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• pp.3-15
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• 1986

This study was carried out to investigate the drying rate and drying defects of Populus euramericana using the SDR (Saw-Dry-Rip) process. Flitches for SDR process were rough edged for compact kiln stacking, and then kiln-dried to 10 percent moisture content with dimensions in the same run, using the kiln-drying schedule ($T_8-F_4$) recommended by Rasmussen. The results obtained were as follows: 1. Drying rate of dimensions was slower than that of flitches. 2. Final moisture content and moisture distribution of dimensions were lower than those of flitches. 3. Average bowing, cupping, crooking, and twisting were reduced 20 percent, 25 percent, 54.9 percent, and 13.4 percent by SDR process respectively. 4. Bowing and cupping were more severe in dimensions from the area near the pith than in those from the area near the bark, and for crooking and twisting the reverse was true. 5. Surface checking of dimensions developed less than that of flitches and end checking of dimensions was similar to that of flitches. 6. Honeycomb, thickness shrinkage, and collapse of dimensions were similar to those of flitches. 7. The degree of casehardening of dimensions was higher than that of flitches.