engleski

Quality of Wood Based Panel Surface and Its Impact on Surfacing with Melamine Impregnated Paper

Delamination of paper could also occur if the surface of the board is contaminated – unreactive. Such low reactivity of board could be due to the high density (as we mentioned before) usage of water repelling substance like wax emulsion or even due to the thermal modification, which partially already occurs during pressing. Quality surface of board is important because the melamine- impregnated papers used nowadays are impregnated with high reactivity resins. At the end of impregnation resin the resin is cured to a predetermined degree and when impregnated paper is paced together with the board into the press the resin has to be reactivated so that it can wet and penetrate into board surface and fully cure in a relatively short time (less than 30 seconds). The aim of this paper is to present the impact of board quality, especially surface quality on the surfacing with impregnated paper. For this purposes commercially available unsanded and sanded particleboard and MDF boards furniture grade were used. For surfacing white melamine impregnated paper marked 80/200 was used. Sanded boards were thermally modified at temperatures 190, 210 and 230°C in oven. Unsanded and sanded boards were sprayed with wax emulsion. Prior to surfacing boards were conditioned at 20°C and 65% relative air humidity. After 5 days of climatization boards were surfaced at 190°C, 2.5 N/mm2. At unsurface board density distribution, surface pH value, wetting contact angle was determined. Surface of board was also analyzed by FT–IR spectrometer. At surface boards only bond strength by surface soundness test was determined.

particleboard; fiberboard; melamine impregnated paper; surface modification; FTIR;

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