Rational production of veneer by IR-heating of green wood during peeling: Modeling experiments
TypeArticles dans des revues avec comité de lecture
Heating green wood logs by infrared (IR) radiation during peeling for veneer production has been numerically simulated, focusing on the heating kinetics of a green wood cylinder rotating with a decreasing radius. The results confi rm those of previous experiments, that this kind of heating is a promising alternative to soaking wood prior to peeling. The model integrates the green wood parameters such as moisture content, density, distribution and ratios of earlywood and latewood, on the one hand, and the peeling conditions of veneer thickness and peeling speed, on the other. The following heat transfer processes were considered: conduction within the bolt, external heating by the IR source, and convection between the bolt surface and the external environment. The outputs were the temperatures of the bolt surface and of layers several millimeters deep. For maximal heat penetration, the bolt should turn in front of the IR source before cutting starts and the IR source should be positioned at the greatest angular distance ahead of the knife. Several heating scenarios could be simulated by the model, thus it is a useful decision-making tool for the design of an in-line IR heating system installed on the peeling lathe.
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The effect of log heating temperature on the peeling process and veneer quality: beech, birch, and spruce case studies DUPLEIX, Anna; DENAUD, Louis; BLÉRON, Laurent; MARCHAL, Rémy; HUGHES, Mark (Springer, 2013)Heating green-wood prior to peeling is necessary to improve both peeling process and quality of veneer. This study investigates optimum heating temperatures by soaking of beech, birch and spruce. Experiments have studied ...
DUPLEIX, Anna; KUSIAK, Andrzej; HUGHES, Mark; ROSSI, Frédéric (De Gruyter, 2013)The thermal properties of wood in the green state have been determined by the transient plane source (TPS) technique. Data are presented on thermal conductivity ( λ ), heat capacity ( C ), and thermal diffusivity ( κ ) at ...
DUPLEIX, Anna; DE SOUSA MENESES, Domingos; HUGHES, Mark; MARCHAL, Rémy (Springer, 2013)There is a lack of quantitative data on the penetration depth and the amount of energy absorbed by green wood under infrared (IR) radiation. This lack of knowledge is a potential barrier to the development of IR heating ...
Experimental validation of green wood peeling assisted by IR heating – some analytical system design considerations BATSALE, Jean-Christophe; KUSIAK, Andrzej; HUGHES, Mark; DENAUD, Louis; DUPLEIX, Anna (de gruyter, 2014)Experimental results have been used to validate a 2D simulation model in order to check its reliability in predicting the heating of a green log rotating under an IR heating source. For the purpose of validation, it was ...
ROBLOT, Guillaume; BLERON, Laurent; MOTHE, Frédéric; COLLET, Robert (Taylor & Francis, 2013)The settings of strength-grading machine for structural pieces of wood are checked according to the EN 14081 standard. However, different machines have different performances depending on the accuracy of the estimation of ...