WOOD IMPREGNATION METHOD Russian patent published in 2005 - IPC

FIELD: wood-working industry, in particular, volumetric impregnation of wood with water-soluble dyes.

SUBSTANCE: method involves placing wooden blank into chamber 1; filling chamber 1 with water-soluble dye supplied from dye tank 5, when vacuum in chamber 1 reaches required vacuum extent; increasing pressure in chamber 1 to P_max; closing valve 11 and switching off pump when pressure reaches P_max value; Pressure in chamber 1 is reduced owing to penetration of water-soluble dye into wood. When pressure alteration rate in chamber 1 is reduced to ≤ 1,400 Pa/s, valve 11 is opened and pump 4 is switched on. Pressure in chamber 1 is raised to P_max value. Process is repeated until pressure dropping rate of ≤ 1,400 Pa is within the range of from P_max to 0.9 P_max. Then impregnation process is stopped.

EFFECT: increased efficiency and precise determination of impregnation time.

2 dwg