| 摘要 |
Apparatus comprising a pressure vessel having within it a plurality of removable spacer elements <B>1, 2</B> and means for generating a pressure differential between the exterior and the interior of the vessel. The pressure vessel can be cylindrical and the spacer elements can be made of a polymeric material, preferably polypropylene, polyethylene or acrylonitrile butadiene styrene. The spacer elements can be cylindrical, hollow and/or of different sizes. In another aspect, a method of generating a pressure differential between the exterior and interior of the vessel. The pressure can be elevated or reduced and the apparatus/method is particularly suitable for the treatment of wood. The spacer elements reduce the amount of void space in the pressure vessel, thus reducing the amount of air to be evacuated for vacuum treatment. Also, if liquid treatments are applied, the volume of said liquids is reduced. |
