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Deroulage du peuplier : effets cultivars et stataions sur la qualite des produits derives

Abstract : Peeling industry is the major application for poplar resource composed with more and more cultivars. A comprehensive evaluation of wood quality of these different cultivars is necessary for a better knowledge of their adequacy to different conventional (light packaging, plywood) or innovative applications (LVL for construction) in order to help foresters in their choices. This research participates to this approach focusing on poplar peelability, veneer quality, mechanical properties of plywood and LVL produced from 10 cultivars (5 well-known by professional and 5 promising new ones) coming from 4 different types of forest stations. Three trees having been harvested per station and per cultivar, the tests have been performed on 120 trees: 40 of them have been peeled in 1.4 mm thick, 40 in 3 mm thick at laboratory scale. The other 40 trees have been peeled in industry in order to collect estimation of qualitative and quantitative production yields. Veneer quality has been evaluated measuring curl-up, surface quality (roughness, plushy surfaces), thickness variation, lathe checking. These veneers have been used to manufacture 320 plywood and LVL boards using two types of glue (PVAC and MUF). Each board has been characterized by non destructive and destructive bending and shearing tests. The results show that veneer quality mainly depends of peeling thickness and of radial position into the tree. Boards' mechanical performances are linked to veneer thickness and glue types. No cultivar or stations effect haven been clearly identified, it is not necessary to adapt peeling and board manufacturing processes according to cultivars and station. Nevertheless, it seems relevant to discuss about an increase of poplar rotation duration in order to be able to use this wood for construction. Finally, technical proposals are made to bypass the presence of tension wood into poplar producing fuzzy surfaces.
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Submitted on : Tuesday, April 6, 2010 - 8:00:00 AM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM
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  • HAL Id : pastel-00005567, version 1


Hafida El Haouazali. Deroulage du peuplier : effets cultivars et stataions sur la qualite des produits derives. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2009. Français. ⟨NNT : 2009ENAM0025⟩. ⟨pastel-00005567⟩



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