a) Blockboard selection (commonly known as Daxinban)
Blockboard surface should be smooth, no warping, deformation, no blistering, depression; core strips arranged evenly and neatly, the gap is small, core strips without rot, cracks, wormholes, thrift and so on. Some blockboards cut corners and cut corners, and the gap between the solid wood strips is large. If nails are used at the cracks, there is basically no nail holding power. When consumers choose to look at the sun, the gaps in the wood strips will be white. If the joinery strength of the blockboard is not good, there will be a “click†sound when the self-financing is done. If the large core plate emits a scent of fragrant wood, it means that the release of formaldehyde is less; if the smell is pungent, it means that the amount of formaldehyde released is more.
The quality of blockboards varies greatly and should be carefully checked during the purchase. First, see if the core material is dense, whether there are obvious joints and decayed wood, whether there are obvious joints and decayed wood, there may be eggs in the decayed wood, and insects will easily occur in the future; The phenomenon of filling putty, this phenomenon is generally to make up for the internal cracks or voids; then is to tap the surface of the plate with a sharp mouth appliance, to hear whether the sound is very different, if the sound changes, indicating there is a hollow inside the plate. These phenomena will weaken the overall load-bearing capacity of the plate, and the long-term non-uniform force will cause the structure of the plate to be distorted and deformed, which will affect the appearance and use effect.
(b) Plywood
Plywood is made of three or more layers of solid wood veneer or thin sheet of about one millimeter. It is usually made of three-ply, five-ply, nine-ply and twelve-ply (commonly known as plywood, five-ply, nine-ply, 12% board), good structural strength, good stability. Plywood contains large amount of glue, and it must be well-sealed during construction to reduce pollution. Plywood is mainly used for various wood products such as the bottom panel of decorative panels and the back panel of panel furniture. The main choice of plywood is its formaldehyde emission and bonding strength. If plywood is poorly glued, it is easy to loosen. When choosing, pay attention to whether the nominal thickness of plywood matches the actual thickness. Select the plywood to pay attention to the following points:
1 Plywood has the difference between the front and back. When picking, the plywood should have clear wood grain, smooth and smooth front surface, and it should be smooth and smooth.
2 plywood should not be damaged, bumps, hard wounds, tangles and other defects.
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