Artificial boxwood cutting
Raw material processing and final processing of the product must be applied to cutting processes, such as rotary cutting, cutting of veneers, cutting of wood chips and shavings, grinding and separation of fibers, and sawing and sanding in final processing. Cutting the wood into units of different shapes and recombining them into various sheets in a certain way can improve certain properties of the wood, such as anisotropy, heterogeneity, swelling and shrinkage. The plate composed of large units has higher mechanical strength, and the plate composed of small units has better homogeneity. Precise control of the thickness error of the rotary cutting veneer can increase the yield of 2 to 3%. The cut wood shavings affect the overall physical and mechanical properties of the particleboard; the fiber morphology is also closely related to the strength of the fiberboard. The final sawing and grinding of the sheet also affect the quality of the product.
Artificial boxwood drying
These include veneer drying, shaving drying, fiber drying in dry fiberboard processes, and heat treatment of wet fiberboard. Drying process and process control are different from finished material drying. The process control of the drying of the material is based on the relative humidity of the drying medium, and care must be taken to prevent the generation of drying stress. The drying of the sheet-like and granular materials used for the wood-based panel is carried out under relatively high temperature, high speed and continuous conditions. At the end of the phase, it is immediately transferred to the deceleration and drying phase. The materials such as veneers and shavings are thin, the surface area is large, and the influence of dry stress is small or non-existent. In addition, the wood tissue undergoes different degrees of relaxation during the cutting process, and the water diffusion resistance is small, and the law of moisture diffusion inside the wood loses its meaning on the veneer and the shavings.
Most of the dry heat sources use steam or combustion gases. Infrared drying energy consumption is too large, 5500 ~ 18000 kJ per evaporation of 1 kg of water; and steam drying only 4200 ~ 5000 kJ. The advantage of high frequency drying is that the drying speed of the dry material is high, the final moisture content is uniform, but the drying cost is too high. It is advantageous if combined with steam is used to achieve duplex heating. Vacuum drying is not only expensive but also has low production efficiency. When steam is used as the heat source, for each kilogram of water evaporated, the veneer needs 1.75-2 kg of steam for drying, and about 1.8 kg of steam for shaving drying. The soft fiber slab needs 1.6 to 1.8 kg of steam for drying.
