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Elastic constants of veneer in beech plywood

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The paper presents the results of the study concerning elastic properties of beech veneers assembled in plywood panels. There has been derived a complete set of elastic constants for veneers considered as orthotropic bodies. Young’s moduli in the grain direction and in the direction perpendicular to the grain were determined by bending plywood strips with their longitudinal axis parallel and perpendicular to the grain of the face plies. The other elastic moduli of the veneers were calculated through the Young’s modulus in the grain direction, with using the regression functions derived for hardwoods by Bodig and Goodman (1973). The effect of glue lines in plywood on the veneer elastic properties was evaluated.
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Strengthening of veneers for 3D-forming

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Strengthening of veneers for 3D-forming. 3D - forming of veneers is used only in limited extent. The reasons are wood properties, mainly anisotropy of wood. In this paper, we propose some chosen methods for strengthening of veneers in directions parallel and perpendicular to the grains, with strengthening means such as hotmelt adhesive and glass fibre with adhesive coating. Properties of modified veneers were compared with the properties of reference - untreated veneers. We compared these properties: strength and deformations - extension in tension, strength and deflection in bending, and 3D - formability. From the results, we can conclude that referred treatments resulted in a slight improvement of 3D - formability.
The bending properties of laminated wood combined with plastic. In the article we present the bending properties of laminated wood produced by the combination of beech veneer and plastic. The combination of wood and plastic enables us to create materials with different properties compared to solid wood. A small decrease in bending strength was demonstrated greater bendability laminated timber.
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The study investigates the properties of lightweight (350–550 kg/m3) particleboardsmade using wood or rape particles and with veneers applied to their surfaces. Their suitability for the production of furniture and elements of interior design isdiscussed. Panels with veneer on their faces were made using a “one shot” pressing cycle. It was found that rape particles may be used for the production of lightweight particleboards, and that they are a good alternative to wood chips. Particleboards made of rape straw, covered with beech veneer during the pressing cycle in order to strengthen their subsurface layers, have better properties than the corresponding wood-chip-based particleboards. However, all the boards, throughout the whole density range, meet the requirements for P2 boards, i.e. boards intended for interior decoration and furniture production (MOR 11 N/mm2, MOE 1600 N/mm2,IB 0.35 N/mm2 according to EN 312).
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