In the bending of wood-based panels, the moisture content of the board should be appropriately increased to improve the plasticity of the board, or the pressurization method of male and female molds should be used to heat at the same time during pressurization. It can escape, and the moisture is continuously added when pressurized. After bending, the board must be fully dried to maintain the bending state.
When the plywood is bent, when the bending radius is large or the board is thin, it can be bent directly by hand pressing without special equipment, and then fixed at the connected position. For example, when bending thick or small bending radius boards, special equipment and processing methods are required. You can saw a groove or cut off a piece on the inner side of the board, and then insert a corresponding piece of wood or wood strip, and you can also cut a gap and then cut a piece of wood. bending.
The time of pressure forming depends on the radius of curvature and the thickness of the board. Such as thin sheets, when the moisture content in the sheet increases and the pressure is assisted by a mold, the bending time can be completed in a few minutes.
With the expansion of the use of wood-based panels, some occasions need to bend them.
The bending of MDF and particleboard generally adopts the method of back groove, and the groove is deep to about 2 mm from the surface. The interval of the groove can be appropriately increased or decreased according to the curvature radius of the bending. A thin metal plate is added to the outer surface to prevent the neutral layer from moving outward when the plate is bent, so as to avoid cracks on the surface of the plate. Try to fix the position to prevent the position from moving. When pressing and bending, the groove should be filled with adhesive or inlaid with wooden strips to ensure the strength of particleboard, etc.