EFFECTS OF ELEVATED AND HIGH-TEMPERATURE SCHEDULES ON WARP IN SOUTHERN YELLOW PINE LUMBER

One hundred and ninety-two pieces of matched 2x6 southern yellow pine (SYP) lumber were dried in two separate charges according to an elevated temperature (ET) and a high-temperature (HT) schedule. Wood properties including juvenile wood content, density, ring count, largest knot area, presence of pith, moisture content, and warp (crook, bow, and twist) were measured for each board. It was found that boards dried with the ET schedule had significantly higher crook than those from the HT schedule. Bow and twist from the ET schedule were also higher, but no significant difference was found between the two schedules. Crook was shown to co-vary with the largest knot area. Twist co-varied significantly with specific gravity, juvenile wood content, and number of rings per inch for the test lumber