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The national standard stipulates a number of quality standards for large core boards, including thickness dimension, web size, warpage, physical and mechanical properties, material defects, processing defects, moisture content, bonding strength, board surface defects, and formaldehyde emission limits. Most of these rigorous inspections of quality indicators need to be performed in the laboratory, but consumers can judge their quality with simple and intuitive methods.
The appearance should be smooth and flawless, and the logo should be complete. The quality blockboard panel should be smooth and free from defects such as dead knots, digging and leaking. The thickness of the middle plate is uniform, there is no overlap, the phenomenon of sew-off, the splicing of the core board is tight, and especially the blockboard cannot be at both ends. There is chapped phenomenon. When erected, the corners should be straight and the diagonal error should not exceed 6 mm.
The whole package of blockboards should fit completely between each board. Touch the surface of the blockboard with your hand. The high-quality blockboard should be dry, smooth and smooth.
Having a good appearance quality should pay more attention to the intrinsic quality. Otherwise, the seemingly clean and clean core board looks like it is open, but the inside is not quite as good as it is—black dead wood, dead wood or lots of big gaps.
Intrinsic quality must first check whether the filling materials are dense, whether there are obvious gaps and decayed wood bars, there may be eggs in the decaying wood bars, and insects will easily occur in the future; look at the phenomenon of whether there is glue or putty in the surrounding area. This phenomenon is generally to compensate for internal cracks or voids.
Since the internal quality of the Daxin board cannot be understood from the appearance, consumers can also judge by simple methods:
Look at the daisy board facing the light, such as white, indicating that the splice is not tight enough; listen to the sound when picked up; there is a “click†sound indicating that the glue strength is not good; lift one end of the blockboard, squeak, high quality The blockboard should have a sense of integrity and heavyness. Of course, such a heavy feeling should be a good thing if the hand feels dry. Otherwise, it is not dry enough. Then, tap the surface of the plate with a sharp-nosed device to hear if there is a big difference in the sound. If there is a change in the sound, there is a hollow inside the plate. These phenomena will reduce the overall bearing capacity of the plate, and the long-term stress will cause the plate structure to be distorted and deformed, affecting the appearance and use effect.
Because large core boards are generally used in the splicing of the core board and the splicing of the panels, urea-aldehyde glue is generally used, and what we now call formaldehyde is actually emitted from the glue. Therefore, the main difference between environmentally friendly large core boards and poor quality large core boards lies in the quality of the glue. If Daxinban is made of environmentally friendly plastic, only dried wood will taste on the production site, and there will be no pungent smell of formaldehyde. If the blockboard emits a pungent odor, it means that the formaldehyde emission is high and it is best not to purchase it.
How to identify the quality of Daxin board
Daxinban (ie blockboard) is one of the main varieties of wood-based panels for decoration and decoration. It is mainly used for furniture manufacturing, doors, windows, ceilings, floors and wall skirts. It is the use of natural peeling veneer and solid wood panels glued, hot pressed plate. From the structural point of view, it is formed by gluing veneers on both sides of the core, and the core is a solid wood plate (or grid frame) formed by splicing core strips (ie, wood strips).