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Phenolic resins for metal bonding. Part II. Phenolic resins for wood bonding are described in the Part I. of this work. In this part, there are shown phenolic resins modified by different polymers, which are used for metal bonding or bonding of metal-wood systems. The polymer blends used for bonding are supplied as tape or film adhesives. A number of commercially available products and representative...
Following paper presents research on methacrylate oligomer and chloroprene rubber water dispersion modification of Diakol M-l urea formaldehyde resin in aim to improve water resistance. It was shown, that 8% addition of methacrylate oligomer significantly improves water resistance of urea-formaldehyde glue joints. Addition of chloroprene rubber water dispersion causes mild increase of glue joints...
Polystyrene and methyl polymethacrylate modified beech and alder wood was glued with melamine-urea resin. Unmodified wood was also glued as a reference. Shear and compression strength of glue joints was tested, in dry state, after 24h damping and 6 hour boiling with 18h cooling. It was stated, that melamine-urea resin is suitable for gluing of polystyrene and methyl polymethacrylate modified wood...
Paper describes effect of surface preservation of plywood with silicone-in-water emulsion on its hygroscopic properties. Three spread values were applied: 35, 70, i 105 g/m2. Protected 3-ply plywood were exposed on 100% humid air and damped. Obtained results were presented in comparison to unprotected samples of plywood. Decrease of swelling, shrinking and absorbability of tested plywood exposed on...
In this work they are shown possibilities of utilisation of adhesives for wood bonding, as: phenolic resins, resorcinol modified novolacs and m-Aminophenol modified novolacs.
Paper presents effect of preservation of pine wood with silicone-in-water emulsion on its hygroscopic properties. Two types of emulsions were tested, Ahydrosil K and Antigraf 02. Preserved wood samples were soaked for 15 days. Preservation results were compared to unprotected control samples. Decrease of swell and absorbability of exposed to water preserved wood was observed.
Zum Verleimen wurde Polyoztanvinylleim mit und ohne Zusatz eines Antipirins verwendet Untersucht wurde die Schwerfestigkeit der Leimfugen von Naturholz und Branschutzmittel getränktem Holz. Die Tränkung des Holzes und seine anschliessende Verleimung führte bei der Mehrzahl untersuchten Präparate zu einem geringügigen Absinken der Schwerfestigkeit der Leimfugen. Nur die Tränkung mit dem PräparaT Uniflam...
The paper investigates the effect of the long-term action of air with various humidity content and its cyclic changes on formaldehyde emission from MDF boards used in the production of furniture. It has been found out that the formaldehyde emission decreases by 50% in case of raw MDF boards stored for approx. 8 weeks in the air with relative humidity content of 45%. The seasoning of MDF boards in...
Influence of veneer with knot holes on mechanical properties of densified wood laminate was tested. Tensile, compressive and parallel to veneer grain bending strength was tested. Percentage of veneers with knot holes, natural and made with hole saw was set on 10, 20, 30 and 50%. Test shows, after statistical verification, that even 50% veneers with knot holes does not significantly affect densified...
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