1. The plywood is made of cooked and softened logs, rotary cut into large sheets, and then placed vertically in the direction of each wood fiber, bonded with synthetic resin with good water resistance, and then pressurized, dried, sawed, and surface-trimmed. The number of layers is an odd number, generally 3-13 layers, respectively called plywood, plywood, etc. The tree species used to make plywood are basswood, birch, ash, beech, colored wood, willow eucalyptus, etc.
2. Fiberboard is a board made of bark, shavings, branches and other wastes by crushing, soaking, grinding into wood pulp, and then pressurized forming and drying. Due to the different temperature and pressure during molding, it can be divided into three types: hard, semi-hard, and soft.
3. Particleboard is a board made of wood shavings or wood fiber materials with or without rubber material. Particleboard has low density and uniform material, but it is easy to absorb moisture and has low strength.
4. Blockboard is a kind of man-made board made of corner waste generated in the process of wood processing through shaping, planing and sizing, splicing and veneer. The core is generally made of short strips of wood that are fully dried, and the surface of the board is made of a single layer of thin wood or plywood. Blockboard is not only an effective measure for comprehensive utilization of wood, but also the resulting board structure is uniform, dimensionally stable, large in size and large in thickness. In addition to surface decoration, it can also be used as a construction material.
5. Other wood-based panel production: The raw materials used in wood-based panels, except for plywood, which need logs, most of them come from harvesting and processing residues, as well as small diameter timber (diameter below 8 cm). Flakes, strips, needles, and granular materials made from crushing or chipping and re-crushing can be used in the manufacture of particleboard. Wood chips are used in the manufacture of fiberboard after fiber separation. In this way, the utilization rate of wood can be increased by 20~25% compared with the traditional utilization method. In the 70s, attention was paid to the use of bark and sawdust as raw materials for wood-based panels, but the bark can only be used in the middle layer of particleboard, and the amount cannot exceed 8%, otherwise the strength of the product will be reduced. In addition, non-wood materials have also received increasing attention, in addition to bagasse, hemp stalks, etc., which have long been used in the production of wood-based panels, has been expanded to a variety of plant stalks and seed shells.
