B - Operations – Transporting – 27 – K
Patent
B - Operations, Transporting
27
K
32/14, 117/98
B27K 3/08 (2006.01) B27K 3/10 (2006.01)
Patent
CA 1230527
Abstract A method for impregnating wood by means of an impregnating liquid, wherein the wood (l) is placed in an airtight, pressure resistant impregnation tank (2) from which the air has been completely or almost completely evacuated, and wherein the impregnating liquid (17), following its intro- duction into the tank, is subjected to pressure. All or almost all of the air and/or gas content of the impregnating liquid is removed prior to its introduction into the impregnation tank (2). The impregnating liquid is intro- duced under completely airtight conditions, whereby the liquid (17) is completely or almost completely devoid of gas and air when impregnation takes place, i.e., upon penetration of the liquid into the wood (1). An apparatus for carrying out the method comprises an impregnation tank (2) for containing the wood (1) to be impregnated, wherein the tank has the necessary equipment for producing a vacuum in the tank as well as pipes connecting it to a storage tank (11) containing impregnating liquid (17) for supplying the impregnating liquid to the impregnation tank (2) following evacuation of the latter tank. In connection with the storage tank (11), equipment is provided for completely or almost completely evacuating the air or other gas from the tank and from the impregnating liquid (17). In connection with the impregnation tank (2), equipment is provided for increasing the pressure in the tank under completely airtight conditions. The increase in pressure can be brought about by providing a means for reducing the volume of the impregnation tank, e.g., by arranging one or more inflatable, elastic bladders (3) in the tank (2) or in a liquid-conducting pipe connected to the tank. The pressure increase can also be produced by introducing additional liquid by means of a pressure pump provided between the storage tank and the impregnation tank.
473339
Fetherstonhaugh & Co.
Rosenlund Terje
LandOfFree
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