Wood preservation

Details Wood preservation Wood preservation

B - Operations, Transporting

27

K

117/120

B27K 3/08 (2006.01) B27K 3/32 (2006.01) B27K 3/52 (2006.01)

Patent

CA 1122484

ABSTRACT OF THE DISCLOSURE Wood is treated by a novel impregnation process wherein water-borne wood preservative treatment materials, such as CCA salts or a sodium chlorophenate, are forced under pressure into the wood and the solution is held within the wood by maintaining the treatment pressure until the impregnants become affixed to the wood by precipitation or chemical depo- sition. A significant"kickout" of depleted treatment liquid occurs when the pressure within the pressure vessel is reduced following the impregnation period, to a pressure at least equal to the internal wood pressure prior to treatment, and preferably to a pressure below the initial wood pressure. The process is preferably carried out at temperatures elevated to 65°C or higher and it is often desirable to heat the treatment liquid, or alternatively to drain the treatment liquid and use steam or a second heated treatment liquid to heat the wood. In any case, care must be taken to maintain a sufficient pressure within the treatment vessel to prevent premature "kickout" of the treatment liquid before 90% or more of the treatment materials have become deposited within the wood.

304508

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