Resumen de Stem reconstruction models and simulation programmes. Tools to evaluate potential wood production in young cork oaks
Sofia Knapic, Isabel Pinto, Arto Usenius, Helena Pereira
3D stem reconstruction and sawing simulation techniques were applied to cork oak logs in order to investigate the potential production of solid wood products. The models allowed to study the wood stem and bark (cork) shape and its variation within the tree. Through the use of sawing simulation systems it was possible to study different scenarios for the production of potential solid wood products from this species. The study was developed with young cork oaks with ages around 30 years. The stems were live sawed into 22-mm flitches that were scanned using VTT's - WoodCIM® camera system providing RGB (colour component) information. The measured data was computed by VTT's PuuPilot software. The data concerning the geometrical features of the stem, bark and innerbark in the flitch was processed with dedicated software producing a mathematical reconstruction of logs and stems in a xyz-co-ordinate system. The sawing simulation programme used these reconstructed stems as input raw material data. The trees were virtually bucked into 0.5 and 1 m log lengths. Seven different products for flooring were tested. Batch yields ranging from 26.6 to 35.4% were obtained from 0.5 m logs and 28.7 to 34.0% from 1 m logs. The best yield was obtained for a 0.5 m mm log for production of parquet components. Young cork oak stems are quite irregular in shape, therefore individual logs from different positions in stem showed important variations.
