Bending strength of press-dried plantation loblolly pine

The bending strength and stiffness properties of plantation loblolly pine clear wood specimens press-dried at 350?F for 90 minutes were compared to those of specimens kiln-dried at 240?F for 18 hours. Specific gravity (SG), modulus of rupture, and modulus of elasticity increased 7.0, 12.9, and 19.0 percent, respectively, in lumber press-dried at 25 psi; and 10.3, 14.7, and 24.0 percent, respectively, in lumber press-dried at 50 psi. However, gamma radiation density gradient tests showed no significant difference in SG through the thickness of the press-dried lumber or between press-dried and air-dried lumber, probably because of the large variation in SG between earlywood and latewood.

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