In our country the production of plywood is very developed, the reason is the availability of its price. Usage of plywood can increase the number produced the original product at the lowest cost. Raw material for veneer plywood raw material can be wood of different trees: alder, ash, oak, linden, poplar, spruce, pine, maple, fir, cedar, and larch. But most often as a veneer material used birch wood due to its uniform structure and high mechanical strength performance. Birch makes it possible to get a smooth veneer of sufficient thickness, from which it will subsequently be made plywood. Also among the hardwood trees as a suitable raw material for plywood can be identified alder and lime, as their wood easy, flexible and has a uniform dense structure.
Whereas, for example, the annual layer of beech, oak, Ash is not quite uniform. Softwood trees as raw material for plywood production are most suitable larch and pine. Russia's Far East has vast resources of coniferous trees, which allows active use the reserves of our country for the production of plywood. But coniferous trees have a small negative – they contain large amounts of tar, which complicates the manufacturing process of plywood. Plywood Wood preparation for peeling.
Timber must be prepared to peeling to align the overall humidity. Wood soaked, after which a relatively equal humidity is supplied to the line shelling. This stage does not require the use of automated technologies and special controls. Line peeling. Here wood (wood cut layer over the entire length), and then peeled veneer is rotary cut with scissors into equal sheets. Line drying veneer. The dryer sheets of veneer get the same moisture content. For some time passes through the veneer of multi-storey roller system in which you installed the required technological regime of drying. Sorting line. In this line, already dried veneer sheets are surface humidity control. Sheets that have the same moisture pass through the system kleevaltsev – first in the lists of the adhesive layer is applied, and then their multi-layered fold. If the wood is imperfect quality, pre-cut veneer sheet with the defective area and glued in their place the so-called "patches". These sheets are put in the middle of the folding. Stage for the identification of defects called notch defect zones and gluing. Extrusion Line. Here glued sheets are pressed under the influence of thermo and formed plywood. To give the finished plywood species spend formatting and grinding. Sanded plywood is ideal for construction projects, since there are known in advance and easily predictable maximum load. The advantage of this type of plywood is the ease and speed machining. Also use lamination process – covering the plywood with a phenolic resin composition. Laminated veneer more water resistant and has a versatility and durability. Modern technology allow to carry out sawing plywood without chipping and scuffing. Thermal conductivity, environmental friendliness and strength of plywood is superior to particleboard (chipboard) Fiberboard (hardboard) and mdf (fiberboard average density). Because of its environmental performance, versatility and low cost of plywood is the most used material in manufacturing worldwide.