Statistical evaluation of the useful width of slats from the format cutting of plywood used in the formation of slab materials

The article is devoted to the statistical assessment of the useful width of the slats from the format cutting of plywood, which are potentially suitable for forming the inner layers of plywood panels and other structures. It is known that in the process of manufacturing general-purpose plywood, a significant amount of wood waste is generated, the proportion of which exceeds 50% of the volume of the initial wood raw materials. One of the types of plywood waste is slats from format cutting of various widths, thicknesses and lengths. Russian standards provide for large allowances for format cropping. Taking into account the cutting width, slats with a width of 20...35 mm are formed during cutting, which make up 5-10% of the volume of the uncut plywood, depending on the format of the finished plywood and processing allowances. It is advisable to use slats from the format cutting of plywood when forming the inner layers of plywood panels. Slats from large-format plywood trimming based on phenolformaldehyde glue with a nominal thickness of 16 mm and a format of 1220×2440 mm (format before trimming – 1300×2500 mm) were considered as the object of research. The useful width of the slats at the two ends (ends) was measured, while the useful width of the slat was assumed to be the size that, after additional processing, allowed the formation of a geometrically correct slat, that is, the size of the smallest veneer layer open at the end. An analysis of the results showed that the actual width of the slats ranges from 10,4 to 36,7 mm. The average value of the useful width of the rails, depending on its length, ranges from 19,6 to 23,1 mm from the minimum end face. The obtained values are stable, the average square deviation is about 4 mm, and the coefficient of variation is 0,16...0,20. All received data arrays obey the law of normal distribution. Based on the data obtained, it is recommended to trim the slats to a width of 20...25 mm with the removal of uneven edges and the use of treated slats to form inner layers of plywood panels with outer layers of mutually perpendicular sheets of peeled veneer. The use of slats from the format cutting of plywood in the production of plywood panels will make it possible to usefully recycle the resulting waste with the production of new material, save wood and adhesive materials, and reduce production costs.

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