Blockboard. Blockboard is composed of a core board and the surface of the solid board. Blockboard core board to splice the wood from the lath, generally using the same species or similar properties of the species. Blockboard of the core board moisture content control between 6 to 12%, the core width is not greater than three times the thickness, not allowed to have a larger crack, cavity. Blockboard table there are two pieces of wood, the better quality called the panel, the other side of the backboard. The panel can be sanded on one side, double-sided sanding or both sides are not sanded. In special cases, the top panel of a jointer allows for proper repair. The joinery board process takes full advantage of the edge waste from woodworking and is a large, moderately thick, evenly constructed construction board.
Blockboard surface should be flat, no warping, deformation, no blistering, depressions; core strips arranged evenly and neatly, small gaps, core strips without decay, fracture, worm holes, knots and scars. Some joinery jerry-built, solid wood strips with large gaps, if the gap in the nail, there is no basic grip nail force.
Consumers can look into the sun when they choose, and the solid wood strips will be translucent at the gaps. If the glue strength of the blockboard is not good, the corner of the clone will have a "squeak" sound of open plastic. If the large core board emits fragrant wood odor, the formaldehyde release less; if the smell is pungent, the formaldehyde release more (natural logs in the natural state also contains traces of aldehyde-containing substances).
Blockboard quality varies greatly, in the purchase should be carefully checked. First of all, look at the core material to see if the ground is dense, there are no obvious seams and decay and deterioration of the wood, decay of the wood may exist within the eggs, easy to moth-eaten in the future; and then look around to see if there is fill glue, fill putty phenomenon, this phenomenon is generally to compensate for internal cracks or voids; and then there is a sharp instrument to knock the surface of the board, listen to the sound is very different, if the sound changes This means that there are cavities in the sheet. These phenomena will weaken the overall weight-bearing capacity of the board, and the uneven long-term force will distort and deform the structure of the board, affecting the appearance and use of the effect.
2、Multi-layer board. Multilayer is sometimes also known as plywood, he and join board in manufacturing method, material selection and other aspects are relatively similar, multilayer and join board are composed of several layers of sheet metal, but different from join board place is multilayer is not necessarily three layers, and each layer of multilayer thickness is the same. Multilayers are structurally strong and stable, and are mainly used in the production of wood products such as baseboards for decorative panels and backsplashes for panel furniture.
Plywood is made of three or more layers of one millimeter or so of solid wood veneer or sheet glued and hot pressed, common three plywood, five plywood, nine plywood and twelve plywood (commonly known as three plywood, five-percent board, nine-percent board, twelve-percent board), good structural strength, good stability. Plywood contains a large amount of glue, the construction should be well edged to reduce pollution.
Plywood is mainly used for decorative panels of the base plate, the backboard of the board furniture and other wood products process. The choice of plywood mainly depends on its formaldehyde emissions and gluing strength. If the gluing strength of plywood is not good, it is easy to fall apart. When choosing plywood pay attention to the nominal thickness and the actual thickness of the plywood is consistent. Choose plywood to pay attention to the following points.
1. Plywood has a positive and negative difference. When selecting, plywood to wood grain clear, smooth and clean front, not rough, to be flat without hand lag.
2. plywood should not have broken, bruised, hard injuries, scars and other blemishes.
Post time: Nov-17-2020