New Zealand Forest Research Institute Limited

Titan Wood Limited

Kourosh Nasheri

Gavin James Durbin

The invention relates to a process for impregnating wood or wood based material. A working solution is preheated to a temperature above the atmospheric boiling point ('a super hot temperature') above the atmospheric boiling point ('a super hot temperature') of the working solution, at an elevated pressure sufficient to maintain the working solution in the liquid phase. The working solution is contacted with a wood or wood based material at a super hot temperature and an elevated pressure to cause impregnation of the solution into the wood or wood based material. The impregnated wood or wood based material and any remaining working solution, waste material and/or by-products are then separated.

Impregnation process

The invention comprises a process for the preservation of timber, wood or wood based products with a boron based preservative. The preservative comprises a mixture of boric acid or boron oxide with one or more solvents selected from the group consisting of methanol and ethanol.

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Rotorua, New Zealand

Kourosh Nasheri