The quality of veneer-laminated wood-based panels shall be checked in accordance with the requirements specified in the national standards. In addition to checking the dimensional tolerances, appearance quality and physical and mechanical properties, it shall also check whether the substrate meets the specified requirements.
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The national standard stipulates that the base materials used for veneer-laminated wood-based panels include plywood, particleboard, and medium-density fiberboard, and must be carefully selected and processed as necessary. The defects of facing quality cannot be left. Therefore, veneer-laminated plywood should be Not less than the second-class products, particleboard is not lower than the requirements of first-class products, medium density fiberboard should not be lower than the first-class product requirements.
Web size tolerance
Variations in the length and width of decorative veneer laminates with different base materials. When the base material is plywood and particle board, only positive tolerances of 5 mm are allowed and negative tolerances are not allowed. When attaching medium density fiberboard, positive and negative 3mm can be allowed. The deviation of thickness is allowed to be between positive and negative 0.3-0.5 mm. The difference between the diagonal lines should meet the requirements of the substrate product standard. The non-straightness of the board edge should not exceed 1 mm for 1 meter. The thickness of the veneer with a warp thickness of 6 mm or more must not exceed 1.0%.
Appearance Quality
The veneer veneer grade, first grade and qualified grade are three grades. For example, double-faced veneer board should ensure that the appearance quality of one side meets the requirements of the grade indicated, and the appearance quality of the other side is not lower than that of the qualified product. Some defects can only be judged by visual inspection. Except for the slight exception of the fine arts, minor defects are not allowed. If defects occur, look at the serious conditions of their defects and lower them.
Physical and mechanical properties check
The national standard provides three indicators of moisture content, impregnation and peeling, and surface bonding strength. If the substrate is plywood, the moisture content is allowed to be 6-14%. The substrate is particleboard and medium density fiberboard, and the moisture content is 4-13%.
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