The effectiveness of a wood preservative depends largely on penetration and retention. Wood can be pre-conditioned in the treatment chamber.When the cylinder is filled with preservative, the pressure is increased until the required amount of preservative has entered the wood.Īdvantages of the pressure treatment over the non-pressure processes are: Then the preservative is forced into the cylinder and air escapes into an equalizer tank at a rate that keeps pressure in the cylinder constant. First, the wood in the cylinder is subjected to air under pressure. The empty-cell process obtains deep penetration with a relatively low retention of preservative. Then, pressure is applied until the required amount of preservative is retained by the wood.
The heated preservative enters the cylinder without adding air. A preliminary vacuum removes as much air from the wood as possible so that it will accept more liquid preservative.
#CRACK OPEN A COLD ONE TANK FULL#
The full cell process provides maximum retention of the preservative. Lumber going into a pressurized treatment cylinder (image: ) There are full cell and empty cell processes. Increasing pressure drives the chemical into the wood. Pressure treatment - the wood is placed into an airtight steel cylinder and immersed in a preservative. Methods of Applying Wood Preservatives Pressure Treatment
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