Effect of conditioning and mechanical deflection on the warp of kiln-dried southern pine studs

Warped southern yellow pine studs were heated in a kiln at high relative humidity then cooled to room temperature in a jig that deflected them in a direction opposite to their natural warp. The assumption was that hot wood with an increased surface moisture content would undergo stress relief and be “set” in the position of restraint during cooling. The treatment reduced warp for a short period of time after restraint was removed, but warp increased with time until studs eventually warped as much as they were before treatment.

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