Effect of high temperature drying on bending and shear strengths of western hemlock Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vt150m15n

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  • The advantages of high-temperature drying are faster drying, reduced inventory, reduced energy requirements, and reduced equilibrium moisture content. However the disadvantages are higher initial costs of the kiln, greater power needs, knot dropout, and reduction in some strength properties. The latter was the subject of this study. Three hundred pieces of No.2 and Better nominal 42 by 145 mm (nominal 2 by 6 inches) by 2400 mm western hemlock were kiln-dried at high (116°C dry bulb and 90°C wet bulb) and conventional (82°C dry bulb and 66°C wet bulb) temperatures to a 15 % moisture content. Drying times at the high temperature condition were 50 % less than at the conventional temperature. The lower value of moisture content at equilibrium observed for the wood dried at high temperature was not statistically different from that of the wood dried at conventional temperature. High temperature drying had no significant effect on mean modulus of elasticity or modulus of rupture. However, an increase in temperature resulted in a significant decrease of shear strength. Values determined by static bending and shear parallel to the grain tests are reported.
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  • Pages 17-18, 20: File scanned at 300 ppi (24-bit Color) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR. All other pages: File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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