Method for compressive shape-drying of wood
AssigneeValtion Teknillinen Tutkimuskeskus
InventorsPertti Viitaniemi, Paavo Kontinen
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Abstract
The invention is related to a method and apparatus for compressive shape-drying of wood (1). In the first phase of the method, green wood is compressed to a desired shape simultaneously heating the wood. According to the invention, during the first phase the wood (1) is compressed against gas-permeable surfaces (3, 4) rapidly to a desired and thickness. during the second phase of the compression process, the compression pressure is lowered to a level causing a thickness reduction equal to or greater than the thickness reduction caused by the drying of the wood, and the internal temperature of the wood is lowered with the progress of the compression process.
Claims10
A method for compressive shape-drying of wood, said method comprising:
- (a) raising the internal temperature of the wood to a predetermined temperature, then compressing the wood in a first phase rapidly to a desired shape against gas-permeable surfaces down to a desired thickness dimension while simultaneously controlling the internal temperature of the wood,
- (b) during a second phase of the compression process, the compression pressure is then lowered to a level causing a thickness reduction equal to or greater than the thickness reduction caused by drying of the wood, and meanwhile, the internal temperature of the wood is lowered with the progress of the compression process of steps (a) and (b).
Dependencies are inferred from the claim text.