Why is the wood-based panel deformed? How to prevent artificial deformation? Even if you are a timber man, you may not really know the reason and answer.
The reasons for the distortion of the wood-based panel are various, but mainly due to the large internal stress of the panel. The types of plates vary, and the factors that cause distortion are also different.
First, analyze the reasons for the deformation of the artificial board:
1. Deformation caused by the asymmetry of the artificial board structure.
The structural asymmetry of the wood-based panel is an important factor in generating the stress in 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 in the interior of 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.
Second, the method to prevent deformation of artificial boards:
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 artificial board 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 uniform to prevent the internal stress caused by the water content and the 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. The finished wood-based panels must be stacked flat and should not be placed in a humid environment.
5. Finishing or veneering of wood-based panels, but it must satisfy the uniform state of the upper and lower surfaces and block the channels of water transfer.
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