Lathe Check Characteristics of Fast Growing Sengon Veneers and Their Effect on LVL Glue-Bond and Bending Strength
TypeArticles dans des revues avec comité de lecture
Fast growing sengon (Paraserianthes moluccana) is largely rotary-cut to produce veneer for core plywood production. In order to provide better information on veneer production and utilization, in this study the effects of wood juvenility and veneer thickness on lathe checks of rotary-cut sengon veneers were evaluated. Before veneer manufacturing, sengon logs were boiled at 50 oC and 75 oC for 4 and 8 hours respectively. The boiled logs were peeled to produce veneer of 1 mm, 1.5 mm, 2 mm in thickness. Lathe checks of veneers were measured on the loosed side at every 5 mm veneer length under an optical video microscope and their frequency, depth, and length were characterized. Twenty sampling points of 5 mm veneer length were prepared from each segmented ring of 1 cm width from pith to bark. Isocyanate resin adhesive were used to produce laminated veneer lumber (LVL) of 20 mm thick, which consisted of 24-ply of 1 mm veneer thick, 14-ply of 1.5 mm veneer thick, and 11-ply of 2 mm veneer thick, for glue bond and bending strength test. Results showed that wood juvenility and veneer thickness determined the frequency, depth and length of lathe checks for the sengon rotary-cut veneers. In general, the frequency of lathe checks of the veneer increases with increasing veneer thickness, and also increases from pith to bark. Boiling of logs before rotary-cutting could decreases the frequency of lathe check of the veneer. The results indicated that boiling of logs at 50 oC for 8 h and at 75 oC at least 4 h before peeling the logs could minimize the frequency of lathe check in manufacturing rotary cut veneer thickness of 1 mm, 1.5 mm, and 2 mm from juvenile wood of fast growing sengon. The frequency of lathe check affect significantly the glue bond and bending strength, in which the glue bond, Modulus of Elasticity (MOE), and Modulus of Rupture (MOR) decrease as the frequency of lathe checks increases.
Files in this item
Showing items related by title, author, creator and subject.
PAŁUBICKI, Bartosz; MARCHAL, Rémy; BUTAUD, Jean-Claude; DENAUD, Louis; BLERON, Laurent; COLLET, Robert; KOWALUK, Grzegorz (Springer-Verlag, 2010)In the present paper, a novel method for veneer checks measurement and description based on digital image analysis is evaluated. According to this method, the camera is located sideways to the veneer allowing for viewing ...
BLERON, Laurent; DENAUD, Louis; COLLET, Robert; MARCHAL, Rémy (Lavoisier, 2011)Since the test method for compression strength perpendicular to the grain was changed from a partial area to a full area loading test, strength values for softwood in EN 338 were significantly reduced. Consequently, a ...
PFEIFFER, Renaud; LORONG, Philippe; RANC, Nicolas; COLLET, Robert; DENAUD, Louis; COTTIN, Fabrice (2014)La simulation numérique de l’opération de fraisage des grumes par slabber doit permettre de prédire les dimensions des plaquettes produites. Pour prendre en compte les spécificités de la coupe du bois. La Méthode des ...
LABIDI, Chafik; DENAUD, Louis; NOUVEAU, Corinne; COLLET, Robert; HENRY, Laurent (Presses Polytechniques et Universitaires Romandes, 2007)One of the major problems concerning tools of wood industry is nicks occurrence on the cutting edge. This phenomenon is accentuated by the small tool angle of most of the wood machining tools. The aim of this present study ...
Lathe check development and properties: effect of log soaking temperature, compression rate, cutting radius and cutting speed during peeling process of European beech (Fagus sylvatica L.) veneer ROHUMAA, Anti; VIGUIER, Joffrey; GIRARDON, Stéphane; KREBS, Michael; DENAUD, Louis (Springer, 2018)The depth of lathe checks and integrity of veneer have been shown to be critical factors affecting the bonding process but also affecting the mechanical properties of veneer-based products. This study shows how beech (Fagus ...