The use of saw-dry-rip to produce southern red oak, sweetgum, and blackgum squares

The use of two new technologies for the manufacture of turning squares resulted in less warp in a much shorter time than current practice provides. The technologies were Saw-Dry-Rip (SDR) and vacuum-dehumidification drying. The species evaluated were southern red oak, blackgum, tupelo, and sweetgum. SDR reduced the amount of warp in the turning squares by 67% for crook, 58% for twist, and 44% for bow. On the basis of reduced warp, the number of usable squares was increased from 64% for southern red oak to 81% for sweetgum, compared to conventional processing. The basis for acceptable squares was arbitrarily set. Drying was excellent for blackgum and sweetgum sapwood. For all southern red oak and some sweetgum heartwood, severe honeycomb and collapse occurred. Further research will be necessary to develop drying schedules for this material.

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