METHOD OF PRODUCING MODIFIED TIMBER Russian patent published in 2010 - IPC B27K3/50 B27K3/14 B27K5/04 B27K5/06 B27N7/00 

FIELD: woodworking industry.

SUBSTANCE: proposed method comprises impregnating wood blanks, drying, compaction and thermal treatment. Blanks impregnation is carried out with 30-40%-water solution of carbamide containing pre-condensate of carbamide-formaldehyde oligomer in amount of 10-12% of dry carbamide weight. Note here that hardener, i.e. "ПКП-52"-carbamide-formaldehyde resin is added to impregnating solution in amount of 21-25% of carbamide-formaldehyde oligomer weight. Before thermal treatment, timber is subjected to pulse magnetic field for 30 s with amplitude of 0.5 T, pulse repetition frequency of 50 Hz and duration of triangular pulses of 30 mcs. Thermal treatment is performed at 140-160°C.

EFFECT: reduction in volumetric swelling of modified timber in water.

1 dwg, 1 tbl, 2 ex