WOOD-BASED PANEL AND THE METHOD OF ITS PRODUCTION (ALTERNATIVES) Russian patent published in 2005 - IPC

FIELD: wood-working industry; production of pressed building items.

SUBSTANCE: the group of inventions is pertinent to the field of production of pressed building items made out of plant roughage and may be used in wood-working construction industries and other branches of economy. The panel made by pressing out of a carpet without synthetic binding materials consists of a mixture of a birchen bark ground up to a faction of 40-5000 microns and a filler predominantly out of cellulose filaments at the following ratios in respect to the total dry solid matter (in mass %): a birchen bark - 60-95, cellulose filaments - 5-40. In an alternative version of the panel, which is made the same way as the above, the outer surfaces of the carpet are strengthened with lingo-cellulose-polymeric compound including an excelsior and the KF-EC resin with a hardener or an excelsior and triturated secondary polymer taken in amount of 10-12 mass % to the weight of the excelsior. At that the share of the lingo-cellulose-polymeric compound makes 20-40 % to the total dry weight of the carpet. The method allows to use a ground birchen bark without synthetic binding agents for shaping a carpet and its consequent pressing. At that for a carpet formation they use the birchen bark ground up to a faction of 40-5000 microns, and a filler mainly made out of cellulose filaments taken in the following ratio in respect to the total dry weight(in mass %): a birchen bark-60-95, cellulose filaments - 5-40. Before formation of the carpet the filler is moistened up to 18-20 % of absolute humidity and is mixed with ground birchen bark. The carpet is formed with a thickness equal to 200-300 % of the thickness of a finished panel. The group of the inventions ensures simplification of the production process, reduction of its cost, expansion of the range of the List of items.

EFFECT: group of the inventions ensures simplification of the production process, reduction of its cost, expansion of the range of the List of items.

8 cl, 1 tbl