Device for pressure treatment of wood
AssigneeAsea Brown Boveri AG
InventorsKeijo Hellgren, Tom Johannisson
Life of this patent
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Abstract
A device for pressure treatment of wood elements comprises a pressure chamber for accommodating the wood elements which are to be treated. The pressure chamber also accommodates a pressure medium which surrounds the wood elements on more than one side and, at least before the pressurization, a secondary medium in the form of a fluid. When the pressure medium is pressurized, the wood elements are subjected to a multilateral pressure, whereby they are permanently compressed. Furthermore, the pressure chamber is provided with elements for controlling the quantity of secondary medium which penetrates into the wood during the treatment. These elements may include evacuating valves or casings which surround the wood elements and which are impenetrable to the secondary medium.
Claims12
A device for pressure treatment of wood comprising:
- a treatment space forming a pressure chamber for accommodating, during the pressure treatment, one or more wood elements;
- a pressure medium for transferring the pressure to the wood elements on at least one side, a secondary medium in the form of a fluid also accommodated in the pressure chamber, at least before the pressurization, and means for controlling the quantity of secondary medium which, during the pressure treatment, penetrates into the wood, said controlling means comprising at least one valve for evacuation of the secondary medium from the pressure chamber, wherein a quantity of the secondary medium which is to penetrate into the wood is selected by closing the at least one valve when appropriate quantity of secondary medium is present in the pressure chamber during pressure treatment.
A device according to claim 5, wherein guide surfaces are coated with at least one friction-changing layer, which reduces or increases the friction between the wood elements and the respective guide surface.
Dependencies are inferred from the claim text.