Plywood is also called plywood, fine core board, plywood, plywood, is the wood segment cut into veneer or by wood square planing cut into thin wood, with adhesive glued into three or more odd layer of plate material, the fiber direction of the adjacent layer of veneer is perpendicular to each other.
In the same plywood, boards of different species and different thicknesses are allowed to be pressed together at the same time, but the symmetrical two layers of veneers require the same species and thickness. Therefore, in the plywood, with the middle board as the center, the boards on both sides are unified in color and thickness.
In the use of plywood, most of the major industrial developed countries will be used in the construction industry, followed by shipbuilding, aviation, vehicles, military, furniture, packaging and other related industrial departments. China's plywood products are mainly used in furniture, decoration, packaging, building templates, car boxes, ships, and production and maintenance.
Length and width specifications are generally: 1220×2440mm;
Thickness specifications are generally: 3, 5, 9, 12, 15, 18mm and so on.
In the finished plywood, the inner veneer other than the table board is collectively referred to as the middle board; It can be divided into short and long plates.
Common plywood veneer wood species are: poplar, eucalyptus, pine, miscellaneous wood and so on.
Plywood veneer according to the appearance grade can be divided into: Special Grade, First Grade, Second Grade, Third Grade board.
Special Grade board: Flat surface specifications, no holes/cracks/skin/dead joints, large burrs;
First Grade board: Flat surface specifications, no skin/bark holes, seams, joints;
Second Grade board: The board surface is basically regular, a small number of skin, bark holes;
Third Grade board: The length and width of the board are incomplete, and the skin, bark holes and defects are many.
Plywood sheet board is used as the outermost layer of plywood veneer, Face Veneer, Back Veneer.
Common wood species used as plywood sheet: Oguman, mahogany, poplar, birch, red olive, mountain osmanthus, ice candy, pencil cedar, white wood, Tang wood, tung wood, yellow olive, clonal wood, etc.
Common plywood sheet wood colors are: peach, red, yellow, white and so on.
The production process of plywood is generally like this:
Rotary Cutting: First cut the raw wood into thin veneer.
Glue: Apply glue to a thin cut veneer
Formation of Embryo: The glue coated thin veneer together.
Cold Press: The thin pieces of wood that are put together are cold pressed into planks.
Hot Press: hot pressing of the wood after cold pressing.
Sanding: sawing the edge after hot pressing and cooling, and then sanding the surface of the plate
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Because the plywood is composed of the veneer after gluing according to the direction of wood grain crisscross the slab, pressed under the condition of heating or not heating, it can overcome the defects of wood to a greater extent, improve the utilization rate of wood, so as to save wood.
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Plywood is made of multiple layers, so it is much cheaper than solid wood in price.
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The physical and mechanical properties of plywood in the vertical and horizontal direction are less different, which can greatly improve and improve the physical and mechanical properties of wood, good dimensional stability, and anti-warping and cracking.
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Plywood can retain the natural texture and color of wood, flat shape, width and thickness is relatively large, so the covering ability is strong, and the application is convenient.
P.s. : Although plywood is also known as multi-layer solid wood, but this is essentially just
the business for the name of the "aesthetic" intentionally named, with the solid wood itself has nothing to do.
So don't take a look at its name in the plate and think that plywood is a solid wood plate.
The first thing to investigate is the material of plywood, the price of different tree species for materials is different, we can choose the right variety according to the decoration budget when decorating.
Generally poor quality plywood, the damage phenomenon of the surface of the board is more serious, so for those board surface damage, or damage and scarring phenomenon of the board, in the purchase process you need to pay attention to the quality of the board.
In addition, some boards are glued together with two different lines of veneer, so when buying to see whether the plywood seam is tight, there is no uneven phenomenon.
Observe whether there are cracks, wormholes, bubbling, stains and other bad marks on the surface of the plywood.
Plywood generally has two positive and negative plates, and when it is selected, the texture of both sides of the plate requires a certain clarity at the same time, and has a certain smoothness, no rough and uneven phenomenon, it is best not to have nodes.
Observe whether the color texture of the plywood is consistent.
Because some plywood is glued, it is necessary to observe whether its color is consistent, whether the texture is consistent, and whether the color of the wood is coordinated with the color of the furniture paint, and the color of the plywood to be purchased should be coordinated with the overall effect of the decoration.
Then check whether the work of the plywood is fine.
Plywood in the selection, should choose those do not loose glue board to apply, plywood if degumming, not only affect the construction, but also cause pollution, so in the selection can be gently beat the board, if the sound is crisp, it shows that the board is better, if the thick sound, it shows that the board degumming phenomenon.
