Twisted deformation of wood-based panels is multifaceted, but mainly caused by the large internal stress of the panels. The types of plates vary, and the factors that cause distortion are also different. Analyze the reasons for its occurrence:
1. The deformation caused by the asymmetry of the artificial board structure The structural asymmetry of the artificial board is an important factor in generating the internal stress of the board. For example, medium-density fiberboard and particleboard, the back layer particles are large and small, and the upper and lower sides of the plywood neutral layer are inconsistent with the tree species, the veneer fiber arrangement direction, the thickness, the water content, the number of layers, and the manufacturing method, or the veneers are twisted. Grain, etc., which is the main reason for warping deformation.
2. Deformation caused by the difference in local moisture content inside the wood-based panel
In the production of wood-based panels, such as particleboard scraper, medium density fiberboard, the fibers are not uniformly dried locally, or are uneven during the sizing process. In the production of plywood, the veneer is unevenly coated. There are differences in moisture content, curing of the glue, and evaporation of the water content, and the stress is uneven, resulting in deformation.
3. Improper hot pressing process or deformation caused by the press itself.
During the pressurization process of the wood-based panel, due to the conditions of the press itself, such as the deformation of the press plate, the temperature of the individual hot platen is not enough, or the deformation caused by uneven pressure, or the hot press process is improperly controlled, the temperature is too high or too low. Deformation caused by too much pressure.
4. Deformation caused by uneven stacking of plates
From the analysis of the cause of the deformation, it is not difficult to find a method for preventing deformation of the artificial board.
1. When manufacturing wood-based panels, the structure of the wood-based panels must be uniform and uniform. The upper and lower sides of the symmetrical center layer should be symmetrical from materials, thickness and moisture content.
2. Strictly control the moisture content of the wood-based panel to be uniform and uniform throughout, the density is uniform, keep the surface of the board smooth and flat, and the glue or sizing should be uniform and consistent to prevent the internal stress caused by the moisture content and uneven shrinkage of the rubber layer.
3. Correctly grasp the hot pressing process and the temperature change of the pressure plate to prevent the local pressure plate from being insufficient and the local local stress and water content to be changed.
4. Finished wood panels must be stacked flat and should not be placed in a damp environment.
5. Finishing or veneering of wood-based panels, but must meet the uniformity of the upper and lower surfaces and block the channels of moisture transfer.
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