THREE-LAYER PRESSED PANEL AND THE METHOD OF MAKING THREE-LAYER CONSTRUCTION ITEMS, MAINLY PANELS, BY DRY COMPACTION Russian patent published in 1995 - IPC

FIELD: construction and industrial engineering. SUBSTANCE: three-layer pressed panel has outside layers, an inside layer, a binding filler containing cones of coniferous needles and the coniferous needles of the outside layers and a binding filler containing cones of coniferous needles and the coniferous needles of the inner layer. The method includes the following; selection of raw materials, selection of the filler and the consequent in-layers pressing of the lower, middle and upper layers of the item, correspondingly. The cones of coniferous needles and the coniferous needles are used in mass ratio 1:3 as a binding filler in the volume equal to 50% of the item mass. The filler is sieved until the particles with dimensions of 5 x 5 mm at the amount of 60-80% and the particles with dimensions of 1x1 mm at the amount of 20-40% are obtained. After that the filler is stirred. Then the lower, middle and upper layers of the item are uniformly and consecutively filled with it before the pressing. The inside layer is filled with 20% of the item mass, the outside layers have 15% of the filler. EFFECT: enhanced quality of three-layer pressed panels made of wood siftings. 2 cl, 1 dwg