Joinery Board, commonly known as large core board, wood core board, and wood board, is made of two veneer boards that are glued and spliced together. After drying), it is processed into wooden strips of certain specifications, which are spliced by a jigsaw machine. The spliced wooden boards are covered with two layers of high-quality veneers on both sides and then made by cold and hot pressing machines. Compared with particleboard and medium-density fiberboard, the fine wood board has the characteristics of lightweight, good nail holding force, high strength, no deformation, sound absorption, heat insulation, etc., easy processing, convenient construction, less pollution, and its natural wood characteristics are more suitable. The natural needs of human beings make it an ideal wood for interior decoration and furniture manufacturing. It is also widely used in the production and construction of sewing machine tabletops, carriages, and ships.
Environmental grade of blockboard
E{{0}} Less than or equal to 0.5mg/L
E1 Less than or equal to 1.5mg/L
E2 Less than or equal to 5.0mg/L
Blockboard advantages and disadvantages
advantage:
Good physical properties: The core material of solid wood has the characteristics of firmness, sound absorption, heat insulation, and good nail holding force; in addition, the blockboard is special plywood, which also has the characteristics of high structural strength and is not easy to deform.
Convenient construction: The interior of the blockboard is made of solid wood slats, which have good nail holding force and low requirements for processing equipment, so the on-site construction is convenient.
Wide range of uses: environmental protection, easy to process, not easy to deform, can be pasted with other materials during processing, lightweight, easy to construct, etc.
shortcoming:
Poor environmental protection: The amount of viscose used in the production of blockboard is more than that of glulam, and it is not as good as glulam, which is also a wood material in terms of environmental protection, but it uses much less glue than particleboard and MDF, and its environmental protection is not good. In order to ensure the environmental protection performance of the joinery boards you buy, it is recommended to choose the regular millennium boat boards for product selection.
Afraid of the wet environment: Although blockboard has high structural strength and strong stability. Because the middle is the core material spliced with small pieces of wood, the upper and lower layers are the special production process of the plywood. Sometimes the slats are unqualified for drying, and there are gaps in the middle. After thermal expansion and cold contraction, it is easy to open the glue, drum surface, and deformation. During construction, care should be taken to avoid using it in the kitchen and bathroom.
Can not be painted directly: the surface of the blockboard is relatively rough, and the production of furniture needs to be veneered and then painted, but cannot be painted directly. The surface treatment usually uses a lot of glue or paint, which will cause very irritating taste, decoration pollution, additional material costs, labor costs, etc. Long-term exposure to this environment will cause great harm to the human body.
Weak bending resistance: The bending resistance of the blockboard is relatively low. We all know that wood board is a type of spliced board, which is usually made of solid wood strips for vertical slicing. Therefore, the bending resistance of the wood board we produce is relatively not so perfect.
How to buy blockboard
The process requirements of blockboard are very high, not only need enough space for wood to have enough time for adaptive natural drying, but also strict drying process control through a drying kiln. Especially after the state enforces the limit of harmful substances in decoration and decoration, the adhesive used for large core boards must be improved. The cost of this alone has increased a lot, and the price of raw materials is still rising. Therefore, due to cost constraints, blockboards that sell for less than 80 yuan on the market must not be purchased. The blind pursuit of cheap will bring harm to human health. Many merchants deceive consumers in various ways in order to make profits. Therefore, when purchasing, you should pay attention to the following points:
(1) The quality grades of blockboards are divided into first-class products, first-class products, and qualified products. Before the blockboard leaves the factory, a non-fading ink mark should be stamped on the lower right corner of the back of each board, indicating the product category, grade, manufacturer code, and inspector code; the category mark should be marked with the words "indoor" and "outdoor". If this information is not available or unclear, consumers should pay attention.
(2) Appearance observation, select the board with smooth surface, fewer knots, and peeling; observe whether the board surface is warped, bent, whether there are bulges, depressions, etc.; observe whether there is glue or putty around the board. Check whether the core strips are arranged evenly and neatly, and the smaller the gap, the better. The width of the core should not exceed 2.5 times the thickness, otherwise, it will be easily deformed.
(3) Touch with your hand, spread your palm, and gently smooth the surface of the wood core board. If you feel a burr piercing your hand, it means that the quality is not high.
(4) Lift one side of the blackboard with both hands, shake it up and down, and listen for the sound of wood stretching and breaking. High-quality blockboards should have a sense of integrity and weight.
(5) After sawing from the side, observe whether the wood quality of the core is uniform and tidy, whether there is decay, breakage, wormholes, etc., and whether the gap between the solid wood strips is large.