Drying 40-mm-thick slash pine in 2.5 hours at 200 degrees C
1995
McNaught, A.M. | Gough, D.K.
This study examined aspects of the feasibility of drying Pinus elliottii at 200 degrees C. Drying time, degrade due to distortion, modulus of elasticity (MOE), modulus of rupture (MOR), and impact strength were compared using matched studs dried at 200 degrees and 145 degrees C. The results show that 40-mm-thick timber can be dried from green-off-saw to 10 percent moisture content in 2.5 hours, with slight, but statistically non-significant, reduction in the levels of twist, spring (crook), and bow. The study did not find statistically significant reductions in MOE, MOR, or impact strength with hotter drying, however, the results suggest a slight reduction in MOE (by 3%) and MOR (6%). It is concluded that this reduction is not considered sufficient to offset the gain due to the large reduction in drying time. MOE/MOR regression relationships do not appear to change with the two kiln temperatures tested, implying that existing machine stress grade cut-off limits are valid for slash pine dried at 200 degrees C.
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