Blockboard (commonly known as large core board, wood board) is a plywood with solid wood core. It cuts the logs into strips, splices into cores, and is made of outer surface materials. The vertical direction (different from core sheet) is resistant. The bending strength is poor, but the lateral bending strength is high. The surface material can be divided into three-layer plate, five-ply plate, etc. according to the number of layers. According to the tree species, it can be divided into Liuye, eucalyptus, teak, etc. The surface of the good quality blockboard panel is smooth and smooth, not easy to warp and deform, and can be sanded according to the surface. The board is divided into two types: one light and two sides. The two-sided light can be used as a decorative material for the key parts such as furniture panels, door and window frames. Most of the market is now solid, glued, double-sided sanding, five-layer blockboard, size specification is 1220mm × 2440mm.
The characteristics of blockboard:
The blockboard has good screw strength, high strength, good quality, sound absorption, heat insulation, etc., and the water content is not high, between 10% and 13%, the processing is simple and the most widely used.
Blockboard is more stable than solid wood, but it is afraid of moisture. It should be avoided in the kitchen.
The processing technology of blockboard is divided into two types: machine and hand. Hand-made is to manually insert the wooden strip into the splint. The wooden strip is subjected to less pressing force, uneven splicing, large gap, poor nail holding force, and cannot be sawed and processed. It is only suitable for sub-projects of partial decoration. Such as the solid wood floor cushion board and so on. The plate of the machine is subjected to a large pressing force, the gap is extremely small, the splicing is flat, the bearing capacity is uniform, long-term use, compact structure and not easy to deform.
Different materials and different quality. The large core board is divided into “excellent productsâ€, “first-class products†and “qualified products†according to the quality of the materials and the texture of the surface materials. There are also companies that mark the grades of grades A, double A and triple A, but this is only corporate behavior, which is inconsistent with national standards, which is currently not allowed on the market.
There are many kinds of wood core boards, such as poplar, birch, pine, and paulownia. Among them, poplar and birch are the best, the texture is dense, the wood is not soft and hard, the nail holding power is strong, and it is not easy to be deformed, and the paulownia The texture is very light, soft, absorbs large water, has poor nail holding power, and is not easy to dry. During the use of the produced sheet, when the water evaporates, the sheet is easy to dry and deform. The hard wood is hard, not easy to press, the splicing structure is not good, the nail holding power is poor, and the deformation coefficient is large.
Use of blockboard
Furniture, doors and windows and sets, partitions, false walls, heating covers, curtain boxes, etc.
Blockboard selection
The surface of the blockboard should be flat, without warping, deformation, no blistering or dent; the core strips are evenly arranged, the gap is small, the core strip is free from decay, breakage, wormholes, thrift and so on. Some blockboards cut corners, and the gap between the solid wood strips is large. If nails are nailed in the gap, there is basically no nail holding force. Consumers can look at the sun when they choose, and the gap between the solid wood strips will be white. If the glue strength of the blockboard is not good, it will have a "å±å±" opening sound when it is self-financing. If the large core board emits a fragrant wood smell, it means that the formaldehyde emission is less; if the smell is pungent, it means that the formaldehyde is released more.
The quality of blockboard is very different and should be carefully checked when purchasing. First of all, see if the core material is dense, whether there are obvious seams and decaying wood strips, whether there are obvious seams and decaying wood strips, there may be eggs in the decaying wood strips, and insects will occur in the future; The phenomenon of filling the putty, this phenomenon is generally to compensate for the internal cracks or voids; then it is to use the sharp-mouthed instrument to strike the surface of the board, to hear whether the sound is very different, if the sound changes, there is a cavity inside the board. These phenomena will weaken the overall bearing capacity of the board, and the uneven long-term stress will cause the sheet structure to be distorted and deformed, which will affect the appearance and use effect.
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