METHOD TO PROCESS WOOD Russian patent published in 1995 - IPC

FIELD: timber and sleeper impregnation. SUBSTANCE: 560 - 650 mm Hg vacuum pumping within 5 to 10 min is performed prior to wood impregnation, then antiseptic vapors at 0.5 - 1.5 atm pressure enter working volume, then working volume is filled with antiseptic at 50 - 65 C temperature and 2.5 - 8 atm pressure being increased gradually. They keep up the pressure during 25 - 40 min with intermediate antiseptic dumping and 560 - 650 mm Hg vacuum pumping in autoclave. EFFECT: deep wood impregnation. 1 tbl