Effect of juvenile wood on strength properties and dimensional stability of black spruce medium-density fiberboard panels
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Jun Li Shi
, Shu Yin Zhang and Bernard Riedl
Abstract
Strength properties and dimensional stability of medium-density fiberboard (MDF) panels made from black spruce (Picea mariana [Mill.] BSP.) 0–20, 21–40, and over 40 year old fiber were studied. An analysis of covariance (ANCOVA) was performed to examine the differences in modulus of rupture (MOR), modulus of elasticity (MOE), and thickness swell (TS) of the three types of panels, while panel density was treated as a covariate in order to adjust the mean values that were partly attributed to panel density. The results indicate that MOR, internal bond (IB), and water absorption of MDF panels made from 0–20 year old fiber, which contained 100% juvenile wood, were significantly superior to those of panels made from 21–40 and over 40 year old fiber; but linear expansion (LE) of MDF panels made from 0–20 year old fiber was significantly larger than that of panels from the other two age classes. The differences in MOR, IB, water absorption, and LE between panels made from 21–40 and over 40 year old fiber were not significant. The comparisons of panel MOE and TS were relatively dependent on panel density due to existence of interactions among the three age groups.
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Articles in the same Issue
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- Inverse analysis of the transient bound water diffusion in wood
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Articles in the same Issue
- Effect of juvenile wood on strength properties and dimensional stability of black spruce medium-density fiberboard panels
- Hot-pressing stress graded aspen veneer for laminated veneer lumber (LVL)
- Internal stresses in glulam due to moisture gradients in the grain direction
- Influence of grain direction in vibrational wood welding
- Evaluation of heat-treated wood swelling by differential scanning calorimetry in relation to chemical composition
- Wettability changes and mass loss during heat treatment of wood
- Inverse analysis of the transient bound water diffusion in wood
- The creep of wood destabilized by change in moisture content. Part 2: The creep behaviors of wood during and immediately after adsorption
- On some physical properties of six aspen clones
- Changes in color and structure of birch wood (Betula pendula) caused by bleaching with hydrogen peroxide solution
- Enhanced wet tensile paper properties via dielectric-barrier discharge
- Survival of bacteria on wood and plastic particles: Dependence on wood species and environmental conditions
- Microdistribution of copper in copper-ethanolamine (Cu-EA) treated southern yellow pine (Pinus spp.) related to density distribution
- Investigations on ribosomal DNA of indoor wood decay fungi for their characterization and identification
- Bioactive phenolic substances in important tree species. Part 3: Knots and stemwood of Acacia crassicarpa and A. mangium
- Cellulose microfibrils: A novel method of preparation using high shear refining and cryocrushing