Blockboard QC Inspection Checklist : Part 3 quality inspection standards for blockboard
Blockboard has good screw holding force, high strength, strong quality, sound absorption, thermal insulation and other characteristics, and its moisture content is not high, between 10% and 13%. It is easy to process and most widely used.
Blockboard is more stable than solid wood, but it should be avoided in kitchen and toilet because it is afraid of dampness.
The processing technology of blockboard is divided into two kinds: machine and hand. Manual assembly is to insert wood strips into splints manually. The extrusion force of wood strips is small, the splicing is not uniform, the gap is large, the nail holding force is poor, and it can not be sawn and processed. It is only suitable for the sub-projects of partial decoration, such as the cushion board of solid wood flooring. However, the extrusion force of the machine-assembled sheet is large, the gap is very small, the splicing is smooth, the bearing force is even, and the structure is compact and not easy to deform for a long time.
Material quality is different. According to the quality of material and the texture of fabrics, large core boards are classified as “excellent products”, “first-class products” and “qualified products”. There are also enterprises that label sheet grades A, double A and triple A, but this is only an enterprise behavior, which is not in line with national standards, and such labeling is not allowed in the market.
There are many kinds of large core board, such as poplar, birch, pine, paulownia, etc. Among them, poplar and birch are the best ones, with dense texture, soft and hard wood, strong nail-holding force and not easy to deform. Paulownia is light in texture, soft, absorbs water greatly, has poor nail-holding force and is not easy to dry. When water evaporates, the board is easy to crack and deform. 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.