[ Chinese wardrobe net ] Blockboard is also called the big core board. It is the first choice material in the decoration project. The cut wood grows short and does not have a shape, and then the core is assembled. The upper and lower sides are glued with 1~2 layers of plywood or other ornaments. The panel is then pressed and its vertical direction (different to the core sheet) is inferior to the bending strength, but the transverse compressive strength is high. The core of blockboard is commonly used in pine, fir, birch, paulownia, poplar and other tree species, among which poplar and birch are the best, the texture is dense, the wood is not soft and hard, the nail holding power is strong, it is not easy to be deformed, and the ordinary hard wood land Hard, not suitable for pressing, the splicing structure is not good, the nail holding power is poor, and the deformation coefficient is large. Its specification is (length and width) 2440X1220 (mm) thickness is 12, 15, 18.
Blockboard can be divided into two categories from the processing technology: one is the hand-made board, which is artificially inserted into the interlayer, the strip is subjected to less pressing force, the stitching is uneven, and the gap is large. The board has poor strength and large gap, so it is not suitable for sawing and processing. Generally, it can only be used in whole sheets, such as the cushion of solid wood floor.
The other type is the mechanism board, which is subject to large pressing force, small gap, flat splicing, uniform bearing capacity, long-term use, and the structure is not easy to be deformed. The quality is better than the manual board, the texture is dense, and the strength is strong. Furniture, etc., but some of the small family's production of the board has many holes, the bond is not strong, and the quality is very poor.
Blockboard replaces the processing of logs in traditional decoration, greatly improving the work efficiency, the surface of the blockboard is smooth, the physical properties and mechanical properties are good, especially the nail holding power is good, the strength is high, the sound is strong and the sound is strong, and the heat insulation is strong. And so on, and the water content is not high, between 10% and 13%, the processing is simple.
The blockboard is widely used in decoration and decoration. It can be used as a partition wall for various furniture, and the base frame of the door and window cover and the decorative veneer is a low-cost decorative profile for small materials. It can be described as a “universal plateâ€. In the production process, blockboard is added with adhesives containing formaldehyde, benzene and other harmful substances. The scope of application should be controlled. During the manufacturing process, the corners and sections should be closed. If economic conditions permit, try to Use environmentally friendly blockboard.
The process of blockboard is very demanding, not only requires sufficient space for the wood to have sufficient time for adaptive natural drying, but also strict drying process control through drying and drying, especially the state imposes restrictions on harmful substances in decoration and decoration. After reaching the standard, the adhesive used for the large core board must be improved. Only this one will increase a lot, and the price of raw materials is still increasing. Therefore, due to cost constraints, the market price is lower than 80 yuan. The blockboard must not be purchased. Blind pursuit of cheapness will bring harm to the health of the human body. Many merchants deceive consumers by various means in order to make profits. Therefore, the following points should be noted when purchasing.
1: The quality grade of blockboard is divided into superior products, first-class products and qualified products. Before the blockboard is shipped, the ink mark should be stamped in the lower right corner of each board to indicate the type, grade and production of the product. Factory code, inspector code, category mark should indicate indoor and outdoor words, if the information is not or not clear, consumers should pay attention.
2: Appearance observation, select the surface flat, bar, small skin, observe whether the surface of the board is air-curved, curved, with or without drums, depressions, etc., observe whether there is no glue around the board, make up the putty phenomenon, check the core arrangement Whether it is even and tidy, 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 the palm of your hand, gently flatten the surface of the wooden core board. If you feel the burr and tie your hand, it means the quality is not high.
4: Use both hands to lift the side of the blockboard, shake it up and down, and listen to whether there is sound of tensile fracture of the wood. Otherwise, the internal gap is large and the cavity is increased. The high quality blockboard should have a sense of integrity and weight. sense.
5: Keep the nose close to the section of the blockboard, and smell if there is a strong irritating smell. If the blockboard emits a tendency to smell wood, it means that the amount of formaldehyde is less. If the smell is pungent, it means that the amount of formaldehyde is higher. many.
6: To place individual merchants to sell fake and inferior products intentionally confused: E1 and E2 boundaries, blockboard is divided into two categories according to hazardous substances, E1 and E2, the main harmful substances are formaldehyde, and the home decoration can only use E1. The blockboard, E2 grade blockboard is a qualified product, and its formaldehyde content may be more than three times that of the E1 large core board.
7: Ask the merchant for the blockboard test report and the quality inspection certificate. The formaldehyde content of the blockboard should not exceed 1.5MG/L before it can be directly used indoors, and the blockboard with formaldehyde content not more than 5MG/L. It must be finished after the finish treatment, so it is necessary to ask whether it meets the national interior decoration materials standard and is indicated on the invoice.
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