Evaluation of Saw-Dry-Rip (SDR) for the Manufacture of Studs from Small Ponderosa Pine Logs.

摘要

Data show that the saw-dry-rip (SDR) method produces higher yields of STUD grade material than is produced by conventional sawing and drying or than has been produced in other studies using young-growth ponderosa pine. The studs are also more stable. Small logs were live sawn into flitches. The flitches were kiln-dried and then ripped into studs for planing. The SDR treatment with high temperature drying resulted in 77.8 percent of studs so produced meeting the STUD grade after 30 or more days of storage. Juvenile wood, compression wood, and less than optimum drying are discussed relative to problems yet remaining in the manufacture of studs from small ponderosa pine logs. (Author)