Veneer Mechanical Grading Based on Online Local Wood Fiber Orientation Measurements to Model and Manufacture Stiffness Optimized Structural Beams
Communication avec acte
Grading veneer for plywood manufacturing is often performed on line using visual criteria issued from EN 635-3 standard. For mechanical applications, the only visual criteria can be not sharp enough to accurately grade veneers as it was noted in the literature for sawmill industry. For logs with a high variability and heterogeneity, the transformation in LVL (laminated veneer lumber) product can be a good valorisation if the veneer grading is efficient. This article presents a new methodology to measure in process the local fiber orientation of a peeled veneer using tracheid effect on a specific apparatus. This device called LOOBAR for Local Online Orientation fiBer AnalyseR, is composed of 4 cameras and a beam supporting 50 red-dot lasers disposed above the peeling lath conveyers allowing for grain angle surface scanning on the ribbon or each veneer if located after the clipper. This field data, put together with the veneer global density, allow for modeling accurately the local elastic properties of each veneer produced to sort them and latter on, to optimize the mechanical properties of a composed engineering wood product such as LVL by adapting the local beam stiffness to the desired purpose. This article presents the results of LVL beams manufacturing and characterization using computed local stiffness to sort veneers. Veneer grading using ther local longitudinal modulus of elasticity and EN635-3 method are compared. The pertinence of the local fiber orientation usage to estimate mechanical veneer properties appears clearly. This approach opens important perspectives using local density and grain angle to sort heterogeneous veneers.
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New Perspectives for LVL Manufacturing from Wood of Heterogeneous Quality—Part. 1: Veneer Mechanical Grading Based on Online Local Wood Fiber Orientation Measurement Article dans une revue avec comité de lectureDURIOT, Robin; POT, Guillaume; GIRARDON, Stéphane; ROUX, Benjamin; MARCON, Bertrand; VIGUIER, Joffrey; DENAUD, Louis (MDPI AG, 2021)The grading of wood veneers according to their true mechanical potential is an important issue in the peeling industry. Unlike in the sawmilling industry, this activity does not currently estimate the local properties of ...
Traceability and quality assessment of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) logs: the TreeTrace_Douglas database Article dans une revue avec comité de lectureLONGUETAUD, Fleur; POT, Guillaume; MOTHE, Frédéric; BARTHELEMY, Alexis; DECELLE, Rémi; DELCONTE, Florian; GE, Xihe; GUILLAUME, Grégoire; MANCINI, Théo; RAVOAJANAHARY, Tojo; BUTAUD, Jean-Claude; COLLET, Robert; DEBLED-RENNESSON, Isabelle; MARCON, Bertrand; NGO, Phuc; ROUX, Benjamin; VIGUIER, Joffrey (Springer Science and Business Media LLC, 2022-11-28)The TreeTrace_Douglas database includes images and measurements at several stages of the processing of Douglas fir logs, from sawmill logyard to machine grading and destructive testing of boards, and is suitable for research ...
New Perspectives for LVL Manufacturing from Wood of Heterogeneous Quality—Part 2: Modeling and Manufacturing of Variable Stiffness Beams Article dans une revue avec comité de lectureThis paper presents a new strategy in the use of wood of heterogeneous quality for composing LVL products. The idea is to consider veneers representative of the resource variability and retain local stiffness information ...
Communication avec acteQUINTERO REYES, Christian; DURIOT, Robin; POT, Guillaume; GIRARDON, Stéphane; LE ROY, Corentin; AUBAGNAC, Christophe; ROTH, Jérémy; RENAUDIN, Fabien; SAUVAT, Nicolas; MILLIEN, Anne; DUBOIS, Frédéric; DENAUD, Louis (2019)Dans ce papier sont présentés les premiers résultats d’une étude globale visant à consolider, puis proposer des règles de dimensionnement de ponts mixtes bois / béton collés. La liaison collée est explorée de manière ...
Article dans une revue avec comité de lectureDURIOT, Robin; RESCALVO, Francisco J.; POT, Guillaume; GIRARDON, Stéphane; FRAYSSINHES, Remy; DENAUD, Louis (Elsevier BV, 2021)The French resource of large diameter Douglas fir is currently still growing, while these large diameter trees are complicated to process efficiently by the sawmilling industry. The rotary peeling process appeared to be ...