Wooden composites from beech plywood and decorative veneers of different natural durability - their decay resistance and selected physico-mechanical properties
Wooden composites from beech plywood and decorative veneers of different natural durability - their decay resistance and selected physico-mechanical properties
This work deals with decay resistance and selected physical and mechanical
properties of wooden composites (WCs) prepared from 3.6 mm thick three-layer beech
plywood and 0.6 mm thick decorative surface veneers of selected exotic (aningr´e, bubinga,
iroko, khaya, padouk, sapelli, weng´e) and domestic (beech, European oak, sweet chestnut,
walnut) wood species. Joining of veneers in the plywood and then also in the WCs was
carried out by pressing processes using the PF glue Fenokol 43. The aim of the experiment
was to determine the influence of surface veneers of different natural durability on rotting
of the WCs, and on resistance of the WCs to water and mechanical loadings, as well.
Decay resistance of individual veneers and WCs was tested by modified EN 113 against
the brown-rot fungi Serpula lacrymans or Coniophora puteana, and the white-rot fungi
Phanerochaete chrysosporium or Trametes versicolor. Weight losses of individual types
of veneers and WCs caused by wood-destroying fungi were compared with weight losses
of beech-veneer and beech-WC, respectively. The lowest weight losses at rotting processes
showed the padouk-WC, i.e. WC prepared from the beech plywood and two the most
durable padouk surface veneers. Density, water soaking, water swelling, tensile strength
perpendicularly to the plane (?), and bending characteristics (MOR, MOE) of all WCs
were determined in accordance with European standards. These physical and mechanical
properties of the WCs were only partly influenced by the type of surface veneers. Selected
types of the WCs, e.g. padouk-WC, could also be convenient for exterior expositions out
of ground contact.
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