Big core board use is what the big core board selection method
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Blockboard (commonly known as Daxin board, woodworking board) is a solid wood board plywood, the vertical (to the core plate to distinguish) bending pressure and poor, but the lateral bending strength is higher. Now most of the market is solid, plastic fight, double sanding, five-tier blockboard, size specifications for the 1220 mm × 2440mm.
Blockboard grip screw force, high strength, with quality Kennedy, sound absorption, insulation and other characteristics, and moisture content is not high, between 10% -13%, easy processing, the most widely used.
Blockboard than solid wood sheet stability, but fear of wet, construction should be avoided to avoid the kitchen.
Blockboard processing technology extension fight and hand fight two kinds of manual hand is made of artificial wood will be embedded in the plywood, the wood by the squeeze pressure difference, not according to cut processing, only suitable for part of the renovation of the sub-project , Such as solid wood flooring mats and so on. And machine fight the plate by the extrusion pressure is relatively large, very small gap, stitching formation, bearing uniform force, long-term use is not easy to deformation. Good blockboard each price between 70-140 yuan, worse in the 40-60 yuan between. Blockboard core material has many kinds, such as poplar, birch, pine, paulownia, etc., of which the poplar, birch for the best, dense texture, wood is not soft not hard, holding nail strong, not easy to deformation. The texture of Paulownia is softer, absorbent, and easy to dry, made of long-term use of water evaporation plate, the plate is easy to dry deformation. And hardwood texture hard, difficult to suppress, stitching structure is not good, holding the force is not bad, deformation coefficient is also large.
Furniture, doors and windows and sets, partition, false walls, heating hood, curtains and so on.
Block surface should be flat, no warping, deformation, no blistering, depression; uniform arrangement of the core bar, the gap is small, the core without decay, fracture, insect hole, knots and so on. Some blockboard cut corners, solid wood cracks, if the nail at the gap, the basic no nail grip force. Consumers can choose to look at the sun, solid wood cracks will be through the white. If the blockboard gluing strength is not good, weigh its own profit and loss will be "creak" open plastic sound. If the big core plate distributed fragrance of wood smell, indicating less formaldehyde release; if the smell pungent, indicating more formaldehyde release.
Blockboard quality varies greatly, in the purchase to be carefully checked. First look at the core material is dense, with or without obvious staggered and rotten wood, with or without obvious staggered and rotten wood, rotten wood may exist in the eggs, the future prone to insects; look around with no glue , Put the phenomenon of putty, this phenomenon is generally to make up for the internal cracks or holes; and then with the mouth of the device to hit the surface of the plate, listen to the sound is very different, if the sound changes, indicating the existence of hollow inside the plate. These phenomena will weaken the overall bearing capacity of the plate, long-term uneven force will make the sheet structure distortion, deformation, affect the appearance and use of results.