Quality Control Standard for Grade Quality of Blockboard:
The quality of blockboard can be checked according to the national standard of blockboard. The quality of Kanban can be judged from three aspects: dimension tolerance, appearance quality and physical and mechanical properties. A kind of
1. Dimensional tolerances: There are two types of thickness and dimension tolerances, such as surface non-sanding, the tolerance value is (+0.8-+1.0 mm) and surface sanding, and the tolerance value is (+0.6-+0.8 mm). The allowable tolerance of length and width is + 5 mm, no negative tolerance is allowed, warpage is allowed to be in the range of 0.2-0.3 mm, and waviness is allowed to be in the range of 0.3-0.5 mm. A kind of
2. Material and processing defects: according to international regulations, they are classified into three grades: first, second and third. In order to ensure the dimensional stability and stress uniformity of the board in use, the veneer with symmetrical layer on both sides of the core board should have the same thickness, the same or similar species, and the texture direction of the veneer with two layers of the core board adhesives should be the same, and the texture direction of the veneer should be perpendicular to the texture direction of the core board. This is the first condition to observe the quality of boards, in addition to visual inspection of material defects and processing defects of blockboard. Insufficient knots, dead knots, skin clips and patches in watches and backplanes. Processing defects such as seam jointing, rolling, burr grooves, penetration contamination, panel lamination, etc. decrease with the increase of defects within the scope permitted by the national standard. But Blockboard of any grade is not allowed to open glue and bubbles. It is also stipulated that no impurities, adhesive tape or obvious paper marks shall be left on the board.如无特殊说明，文章均为本站原创，转载请注明出处。If there are no special instructions, the articles are original, if you want to use or reproduce, please indicate the original source www.plywoodinspection.com,If you find that our articles infringe on your copyrights and interests, please email us at email@example.com in time and we will delete it at the first time.