METHOD OF TIMBER MODIFICATION Russian patent published in 2013 - IPC B27K3/08 B27K3/34 B82Y99/00 

FIELD: process engineering.

SUBSTANCE: invention relates to woodworking. Propose method comprises wood blank preliminary shaping and sizing and adjusting moisture content. Blank is impregnated with polymerisation composition and subjected to drying and cooling. Note here that said blank is subjected to drying in vacuum pressure chamber to moisture content of 2-3% and to vacuum of 0.8 MPa for 45-60 min. Blank is immersed in impregnation solution, for example, 20-25%-solution of acetone-formaldehyde resin taken in amount sufficient for deep immersion. Vacuum of 0.8 MPa is created to keep wood blank in said solution for 30-60 min. Hydraulic pressure of 8-10 MPa is created in vacuum pressure chamber for 2-3 h. Unused impregnation solution of wood modifier is pumped over into standby tank. Vacuum of 0.8 MPa is created in vacuum pressure chamber and retained for 0.5-1.0 h. Pressure is said chamber is recovered to barometric pressure to dry impregnated wood blank to moisture content of 5-8%.

EFFECT: improved hardwood properties.

6 cl, 1 tbl