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The Flakes Alignment Efficiency and Orthotropic Properties of Oriented Strand Board

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Published/Copyright: June 1, 2005
Holzforschung
From the journal Volume 55 Issue 1

Summary

This study was designed to investigate the efficiency of flake's alignment and orthotropic properties of oriented strand board (OSB) by using ultrasonic wave method. It was designed also to discuss the correlation among ultrasonic velocity (V), dynamic modulus of elasticity (Ed), modulus of elasticity in bending (MOE) and modulus of rupture (MOR). Results are summarized as follows:

The flake's aligned angle (θ): the angles between flake length direction and mechanical alignment direction on the face layer of OSB within 0°–30° were 93–97% for JSP(OSB made from 100% of Japanese cedar flakes), JMP(OSB made from 50% of Japanese cedar flakes and 50% of Taiwan paulownia flakes) and CMP(OSB made from 50% of China fir flakes and 50% of Taiwan paulownia flakes) groups OSB, and on the bottom layer, 76–85% for these three groups OSB, respectively.

The ultrasonic velocity (V) at 0° of angle between flake's length direction and mechanical alignment direction (V0) was the highest, decreasing rapidly with increase of aligned angle (θ). The lowest value of ultrasonic velocity occurred at 90° of angle between flake's length direction and mechanical alignment direction (V90) and the relationship between θ and V could be represented by Hankinson's formula, and Jacoby equation.

The orthotropic properties of OSB, defined as the ratio of V0/V90 were 2.4–3.2 for the full piece specimens, and 2.4–2.6 for the bending tested specimens.

Interrelationships between V, Ed, MOR and MOE were positive linear regression formulas.

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Published Online: 2005-06-01
Published in Print: 2001-12-14

Copyright © 2001 by Walter de Gruyter GmbH & Co. KG

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https://doi.org/10.1515/HF.2001.016

Articles in the same Issue

  1. Genetic Variation in the Decay Resistance of Siberian Larch (Larix sibirica Ledeb.) Wood
  2. Chromated Copper Arsenate Preservative Treatment of North American Hardwoods. Part 2. CCA Leaching Performance
  3. Interaction of Copper-Containing Preservatives with Wood. Part 1. Mechanism of the Interaction of Copper with Cellulose
  4. Identification of Cupric and Cuprous Copper in Copper Naphthenate-Treated Wood by X-Ray Photoelectron Spectroscopy
  5. Measurement of Wood Wettability by the Wilhelmy Method. Part 1. Contamination of Probe Liquids by Extractives
  6. Measurement of Wood Wettability by the Wilhelmy Method. Part 2. Determination of Apparent Contact Angles
  7. Biomechanical Pulping of Agave sisalana
  8. Oxidation of Benzyl Alcohols by the Laccase-Mediator System (LMS) a Comprehensive Kinetic Description
  9. Chemical Modification of Wood by Polyglycerol/Maleic Anhydride Treatment
  10. Relationship between Released Strain and Growth Rate in 39 Year-Old Tectona grandis Planted in Indonesia
  11. Reduction of Residual Stresses in Medium Density Fibreboard. Part 1. Taguchi Analysis
  12. Reduction of Residual Stresses in Medium Density Fibreboard. Part 2. Effects on Thickness Swell and Other Properties
  13. Evaluation of Pettys Nonlinear Model in Wood Permeability Measurement
  14. Dielectric Relaxation Based on Adsorbed Water in Wood Cell Wall under Non-Equilibrium State 2
  15. Preparation and Properties of Acetylated and Propionylated Wood-Silicate Composite
  16. The Flakes Alignment Efficiency and Orthotropic Properties of Oriented Strand Board
  17. Walter Liese 75 Years Young
  18. Literature Reports
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