Abstract
ABSTRACT • Some properties of plywood panels made from untreated and thermally modified (90 min. at 200 oC) poplar veneers and their combinations have been analyzed. The change in equilibrium moisture content and the change in dimensions of the samples conditioned above water in closed containers were examined. The analysis using F-test (ANOVA) at the significance level of 95% confirmed that, regarding moisture content, all combinations of plywood panels differed significantly from the control panels. However, the analysis of thickness swelling showed that there was no significant difference among the plywood panels of similar construction. The highest values of anti-swelling efficiency were shown by plywood panels made from thermally modified veneers.
Highlights
IntroductionThe purpose of thermal wood modification is to obtain the products of improved dimensional stability, decay resistance and durability
The analysis of thickness swelling showed that there was no significant difference among the plywood panels of similar construction
Based on the examination of plywood panels produced by combining the thermally treated and untreated poplar veneers, it was concluded that the thermal modification process had a positive effect on the decrease in moisture absorption of the panels
Summary
The purpose of thermal wood modification is to obtain the products of improved dimensional stability, decay resistance and durability. The most thermally labile of wood polymeric components begin to degrade inside the cell wall (primarily hemicelluloses and in later stages cellulose) resulting in the production of furan compounds, such as furfural and hydroxymethilfurfural. . Zdravković, Lovrić, Stanković: Dimensional Stability of Plywood Panels Made. The links inside the lignin complex are degraded. This phase of increased lignin reactivity is characterized by the production of various condensation reactions between aldehyde and lignin, as well as by self condensation of lignin (Tjeerdsma et al, 2005)
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