Mathematical model for control of high temperature drying of southern yellow pine dimension lumber

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dc.contributor.authorOliveira, Luiz Carlosen
dc.contributor.committeechairWengert, E.M.en
dc.contributor.committeememberIfju, Gezaen
dc.contributor.committeememberSkaar, C.en
dc.contributor.committeememberLamb, F.M.en
dc.contributor.committeememberThomas, W.C.en
dc.contributor.departmentForest Productsen
dc.date.accessioned2017-03-10T21:55:05Zen
dc.date.available2017-03-10T21:55:05Zen
dc.date.issued1985en
dc.description.abstractAlthough High temperature drying (HTD) of southern yellow pine (SYP) is extensively used, quality problems still exist. Approximately 25 percent of all green lumber (2 x 4, 2 x 6 and 2 x 8's) are degraded during HTD. Warp degrade, specifically "crook", is the main cause for the loss of quality of SYP dried at temperatures above the boiling point of water. One of the major causes of warp degrade is excessive shrinkage that results from overdrying. In industrial practices, average final moisture contents for HTD of SYP lumber are usually well below the 15% MC maximum permitted by the grading rules. Overdrying the lumber causes not only lumber quality problems, but also constitutes a waste of energy. In order to improve the overall results of HTD of SYP, it is necessary to perform a better control of the process, so unnecessary extended drying can be prevented. In this study, a mathematical model based on the temperature drop across the load (TDAL) concept was proposed. The model relates TDAL to drying rates and according to the results, it appears to be an important alternative for controlling purposes during HTD of SYP.en
dc.description.degreePh. D.en
dc.format.extentxv, 184 leaves : ill. ; 28 cmen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/76523en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 13253727en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1985.O448en
dc.subject.lcshLumber -- Dryingen
dc.subject.lcshYellow pines -- Dryingen
dc.titleMathematical model for control of high temperature drying of southern yellow pine dimension lumberen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineForest Productsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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