Автор: Mária Šmidriaková

Статии

HEAT RESISTANCE OF FURNITURE PARTS COVERED BY PLASMA TREATED FOILS

Автори: Ján Sedliačik, Tomasz Krystofiak, Pavol Antal, Mária Šmidriaková, Lis Barbara

Резюме

Surface finish of furniture parts with foils is very popular way of decorative 3D–finish of furniture. As the foil is a thermoplastic material, for furniture parts used in interiors of bathroom or kitchen it is important to be water resistant and heat resistant. We tested polyethylene (PET) and polyvinylchloride (PVC) foils with 9 various colourations and gloss, 4 types of polyurethane based dispersions and two press settings. MDF was used as the base board. Surface of selected foil types was modified by electric discharge plasma. Measurement of the contact angle Θ of the surface of foils was done with distilled water as wetting liquid, according to EN 828. Estimation of the adherence of foils to the substrate with the pull-off method was done according to the procedure EN ISO 4624. Heat resistance of glued joint was tested by heating the samples in a chamber at temperatures from 50 °C to heat destruction. The appearance and damage of all tested samples were assessed visually. The results have shown that the type of adhesive, type of foil and vacuum pressing process are significant for joint quality. Heat resistance can be increased up to 20 or 30 °C by proper setting of the pressing process. Appearance was improved on plasma treated samples.

Ключови думи: heat resistance, foil, polyurethane dispersion, vacuum pressing, surface finish

EN Version

WOOD-BASED PANELS WITH LOW FORMALDEHYDE EMISSION BY COLLAGEN AND KERATIN BIOPOLYMERS

Автори: Ján Sedliačik, Ján Matyašovský, Peter Jurkovič, Mária Šmidriaková

Резюме

Urea formaldehyde (UF) adhesives are the most commonly used for wood-based panels, but their main disadvantage is an intensive formaldehyde emission. The aim of the investigation was to reduce the release of formaldehyde from UF bonded wood materials by developing and testing new and more efficient modifiers that bind formaldehyde and form more stable methylene bonds resistant to hydrolysis of the adhesive. Methylol pre-condensate additives with varying ratios of glutaraldehyde and urea modified by fibril proteins based on collagen and keratin were tested. The measurements confirmed the decrease of formaldehyde at all concentrations of methylol pre-condensate compared to the reference sample. Formaldehyde emissions were evaluated from five-layer plywood according to JIS A 1460 (2001): "Building boards. Determination of formaldehyde emission. Desiccator method". The most significant decrease of formaldehyde emission up to 37% was achieved with the application of 5% methylol pre-condensate into UF adhesive standard. The gluing quality has been assessed according to standards EN 314-1 and EN 314-2 and the tested plywood meet the requirements of the standard for Class 1 – suitable for application in the interior.

Ключови думи: wood-based panels, urea-formaldehyde resin, collagen, keratin, plywood

EN Version