How to make plywood
How to make plywood
Log selection is the first part of the process, which involves careful identification and isolation of locks from the front and core veneers in terms of the physical geometry and quality of the species. The main goal is to produce veneers from species with recognized physical and aesthetic characteristics. After the logs are loaded to the peeling station, cut them, measure the treated logs and mark the length to cut them to the standard size. Then send the log of standard length into the barker to remove the bark and improve the roundness of the cross section. Recycle waste, collect wood waste for recycling or use as fuel. Collect wood waste for recycling or use as fuel.
The log is rotated by a sharp knife, and the bark is gradually scraped off by a series of rotating blades. When the peelless log enters the rotary peeling machine, its working principle is like a huge pencil sharpener, scraping off a continuous thin piece, which is called "application", so it is called plywood. This will turn the log into a stick in a few seconds. It will be classified by grade and sent to the dryer. The blades on both sides will trim the laminates to produce neat straight edges. After cutting, the core veneer is sent to the rubber roller, and the combination layer or veneer is bottled additive, according to the type of additive used for the plywood produced. Veneer layers are manually stacked into plywood sandwiches. These smaller boards are connected together to form a standard board. In the process we call cross granularity, each adjacent layer can rotate up to 90 degrees. The cross pattern plywood can resist cracking when the edge is nailed in, minimize expansion and shrinkage and improve its stability. The individual plates are sent to the press, where heat and pressure are applied. Now the laminates are completely flat and firmly bonded. Press the pressing plate or combined paddle under controlled hydraulic pressure at ambient temperature, and then solidify the glue to form a mini board suitable for each pattern. This process also helps to flatten the plywood. Trim and polish: the panel will be trimmed to the size panel will be repaired and polished. The processed panel is sent to a smooth surface and uniform thickness. According to the market specification, the panel can be placed on the front or front and back, and then trimmed to the final size. Finished products are packaged and transported to customers.
① The main tree species for the production of rotary-cut veneer are ash, linden, Apollo, oak, lotus, poplar, catalpa, Zhennan, birch, maple, maple, silk chestnut, alder, maple, spruce, masson pine, Yunnan pine, etc. ② The main tree species for the production of planed thin wood include Fraxinus mandshurica, Phellodendron amurense, oak, walnut, catalpa, etc. In addition, some Nanyang wood and African wood are also used in plywood production, among which the main tree species are Liu'an, Abidong, clone, etc