METHOD OF DRYING AND THERMO-WET PROCESSING OF LARGE-SIZED WOOD Russian patent published in 2014 - IPC F26B3/04 F26B5/04 

FIELD: woodworking industry.

SUBSTANCE: method of drying and thermo-wet processing of large-sized wood is carried out by removing the free moisture by alternating the stage of heating the wood and vacuuming, the stage of creating air pressure for 10-15 minutes, and when removing the inherent moisture the stage of warming wood is carried out by radiation-contact method, in the heating process the wood is exposed to saturated water steam with the temperature of 150-180°C, at the stage of vacuuming the pressure in the device is lowered by law $$P=\mathrm{3,0814}\cdot e^{\mathrm{0,0334}\left(T_{heat}-a_T\frac{T_{c.m}-T_{sur.m}}{R^2}\cdot \tau \right)},$$ where T_heat is the temperature of wood after the previous stage of heating, °C; T_sur.m is the temperature of surface of the wood, °C; T_c.m is the temperature of the centre of the wood, °C; R is the radius or half the thickness of the wood, m; A_T is the thermal diffusivity of wood, m²/s; τ is the current duration of the vacuuming stage, sec; the temperature difference between the surface and the centre of the wood (T_c.m-T_sur.m)=10÷12°C; after the termination of the vacuuming stage the wood is exposed to the air pressure of 5-10 atm.

EFFECT: invention enables to carry out simultaneous drying and thermo-wet processing of high-moisture large-sized wood.

1 dwg, 1 tbl