China's top ten environmental protection sheet 100 treasures to analyze the reasons for the distortion of the artificial board

2022-08-11 09:04:19


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.

 

1. Deformation caused by asymmetry of wood-based panel 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 of 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.

 

 

4. Deformation caused by uneven stacking of plates


 

 

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