As the range of use of wood-based panels expands, it is necessary to bend them in some cases.
The medium-density fiberboard and particleboard bending process is generally carried out by means of a back groove, and the groove is opened to a depth of about 2 mm from the surface. The spacing of the grooves can be appropriately increased or decreased according to the radius of curvature of the curved surface, and a thin metal plate is added to the outer surface, the purpose of which is to prevent the neutral layer from moving outward when the plate is bent to avoid cracking on the surface of the plate, and the ends of the plate are further Try to fix the position to prevent the position from moving. When pressing and bending, the groove should be filled with adhesive or embedded in the wooden strip to ensure the strength of the particle board.
When the plywood is bent, when the bending radius is large or the plate is thin, it can be bent by hand without using special equipment, and then fixed at the connected position. If the plate is thicker or has a small bending radius, special equipment and processing methods are required. You can cut or cut a piece on the inside of the board, and then insert a corresponding piece of wood or wood. You can also cut out the gap. bending.
In the bending of the artificial board, the water content of the board is appropriately increased to improve the plasticity of the board, or the male and female mold pressing method is used, and heating is simultaneously performed under pressure, and the water hole can be appropriately opened on the metal plate or the mold to make water vapor It can escape and replenish moisture during pressurization. After bending, the plate must be fully dried to maintain the bending state.
The time for press molding depends on the radius of curvature and the thickness of the board. Such as thin sheets, when the water content in the board increases and the mold is used to assist the pressurization, the bending time can be completed in a few minutes.
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