Listning ID 12293
Plywood is a complex drevesnoplitnye material consisting of sheets of veneer glued together . Peeled veneer get special equipment (peeling machines), which are cut with a round billet logs "churaka". Rotary cut veneer used in the manufacture of plywood, is made length and width from 1.3 m to 3 m depending on the applied glue, plywood is subdivided into two brands : WBP – plywood high moisture resistance (water resistance), glued with phenol-formaldehyde resins and FC – plywood water-resistant (water-resistant plywood), slika which is made of urea formaldehyde resins.Plywood is divided into grades in accordance with the grades of the upper layers of veneer. When referring to the grades indicated grade plywood top layer, and then lower. In the designation of the grade of plywood veneer softwood to the designation of a grade veneer is added the letter x, for example, Ex/IX. The degree of machining the external surfaces of the plywood sheets are divided into unpolished (SN), polished on one side (SH1) and two sides (W2). The moisture content of the plywood must be in the range of 5-10%.Plywood is subdivided into the following types according to the format sheet: H mm (60 inches) is the so-called square plywood (square), this kind of plywood is traditionally produced in Russia and Ukraine on a large number of plants; balletomania plywood has dimensions h mm. in Addition to these species, plywood is made with formats: H mm birch plywood also applies to large-format plywood.Large-format plywood is divided into sub-groups: longitudinal plywood is plywood in which the grain direction of the outer veneer sheets coincides with a greater side of the plywood sheet; transverse plywood is plywood, fiber direction of which coincides with the short side of the sheets, (these properties are extremely important because they affect the basic physical and mechanical properties of plywood).
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