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A simple method to determine the diffusivity of green wood

Type
Articles dans des revues avec comité de lecture
Auteur
FRAYSSINHES, Rémy
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
GIRARDON, Stéphane
144622 Laboratoire d'Etude et de Recherche sur le Matériau Bois [LERMAB]
MARCON, Bertrand
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
DENAUD, Louis
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
COLLET, Robert
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]

URI
http://hdl.handle.net/10985/19463
DOI
10.15376/biores.8.3.6539-6549
Date
2020
Journal
BioResources

Résumé

Log temperature appreciably influences veneer quality during the rotary peeling process. The assessment of the thermal properties of green wood is complex and typically requires the sawing of small calibrated samples. This study introduced a simple approach based on an inverse identification method to determine the global log thermal diffusivity online and without the time-consuming extraction of wooden samples that is commonly used to perform diffusivity experiments. This method was applied to green Douglas fir logs and resulted in an average thermal diffusivity of 0.175 ± 0.021 mm2.s-1. This method was found to be suitable for both heartwood and sapwood and thus can provide a globally applicable diffusivity assessment method. This global parameter is essential to optimizing the soaking time and improving the subsequent veneer production quality. As log-soaking preprocessing requires an immense input of energy, this time-optimization strategy will allow sizable cost reduction and ecological improvement.

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Documents liés

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  • Modeling the Influence of Knots on Douglas-Fir Veneer Fiber Orientation 
    FRAYSSINHES, Rémy; GIRARDON, Stéphane; DENAUD, Louis; COLLET, Robert (MDPI AG, 2020)
    This study presents a method for predicting the local fiber orientation of veneers made from peeled Douglas-fir logs based on the knowledge of the tree branch characteristics (location, radius, insertion angle, azimuth ...
  • Effect of grain direction on cutting forces and chip geometry during green beech wood machining 
    CURTI, Rémi; MARCON, Bertrand; DENAUD, Louis; COLLET, Robert (BioResources, 2018)
    Proper valorization of the sawing wastes in industrial sawmills is a permanent issue with strong economic and environmental stakes. Most industrial sawmills are equipped with chipper-canter heads reducing the outer part ...
  • Influence of veneer lathe checks on the mechanical properties of LVL 
    POT, Guillaume; DENAUD, Louis; COLLET, Robert; GIRARDON, Stéphane; COTTIN, Fabrice (FPInnovations, 2015)
    Laminated veneer lumber (LVL) is a high-performance engineered wood product made of several wood veneers bound together mostly in grain direction. Veneers are obtained thanks to peeling process. This cutting process induces ...
  • Effect of Forestry Management and Veneer Defects Identified by X-ray Analysis on Mechanical Properties of Laminated Veneer Lumber Beams Made of Beech 
    VIGUIER, Joffrey; MARCON, Bertrand; GIRARDON, Stéphane; DENAUD, Louis (NC State University, 2017)
    This study proposes an innovative model based on local grain angle measurements to predict the modulus of elasticity of LVL made from beech. It includes a veneers sorting method industrially compatible thanks to its low ...
  • Panel Shear of Plywood in Structural Sizes - Assessment Improvement Using Digital Image Correlation 
    VIGUIER, Joffrey; MARCON, Bertrand; BUTAUD, Jean-Claude; DENAUD, Louis; COLLET, Robert (Springer Science and Business Media LLC, 2021)
    This paper introduces a new test configuration for the determination of panel shear properties in structural sizes. This original test configuration has been successfully applied to calculate the shear properties of beech ...

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