The blockboard has good screw holding force, high strength, strong quality, sound absorption, thermal insulation, etc., and the moisture content is not high, between 10% and 13%, easy to process, and the most widely used.
Blockboard is more stable than solid wood board, but it is afraid of moisture, so it should be avoided in the kitchen and bathroom during construction.
The processing technology of blockboard is divided into two types: machine and hand. Hand-made is to manually inlay the wooden strips into the plywood, the extrusion force of the wooden strips is small, the splicing is uneven, the gap is large, the nail holding force is poor, can not be sawed processing, only suitable for partial decoration of the sub-project, such as the cushion wool board of the solid wood floor. The extrusion force of the machine-assembled plate is larger, the gap is very small, the splicing is smooth, the bearing capacity is uniform, and the structure is compact and not easy to deform for long-term use.
According to the quality of the material, the large core board is divided into "excellent product", "first-class product" and "qualified product" according to the quality of the material and the texture of the surface material. There are also enterprises that mark the plate grade as A-grade, double-A grade and triple-A grade, but this is only a corporate behavior, which is inconsistent with the national standard, and this kind of marking is no longer allowed in the market.
There are many kinds of materials of large core board, such as poplar, birch, pine, paulownia, etc., among which poplar and birch are the best, the texture is dense, the wood is not soft or hard, the nail holding force is strong, and it is not easy to deform, and the texture of the paulownia is very light, soft, absorbs water, the nail holding force is poor, it is not easy to dry, and the board made of it is easy to dry and crack and deform during use. The pine wood is hard, not easy to press, the splicing structure is not good, the nail holding force is poor, and the deformation coefficient is large.
