Analysis of volumetric output of lumber, taking into account the quality classes of dust raw materials

Abstract

Due to the cancellation of standards developed before 1992 that regulate the requirements for raw materials and products of the woodworking industry, the norms of output of timber from dust raw materials have lost their relevance in Ukraine since January 2019. In particular, the incongruity of the number of quality classes (varieties), the difference in quality requirements and determination of the volume of dust raw materials caused the need to develop new standards of consumption of dust raw materials for timber. The consumption of dust raw materials for the production of timber depends on a number of factors, in particular: wood, sawing patterns (posture), thickness of headsaws, diameter, length, convergence, curvature and other signs of dust raw materials (timber), timber specification. The qualification of workers, technical condition of the equipment, organization of labor in compliance with technological discipline at all production sites also have a significant impact on the consumption of dust raw materials for the production of timber. According to DSTU EN 1316-1:2018 on the quality of timber, beech materials, for instance, are divided into four classes of quality (A, B, C, D). In comparison to this, they were divided into three varieties (1, 2, 3), according to GOST 9462-88. Consequently, there are differences in determining the quality of timber, which should be taken into account when setting the consumption standards of dust raw materials in the production of timber depending on the quality of raw materials and in accordance with the requirements of the current regulations. Analysis of the results of theoretical and experimental studies of volume output of lumber made it possible to develop scientifically reasonable standards for consumption of dust raw materials considering the quality of raw materials of coniferous and hardwoods during their sawing on dust and tape pads. It indicates that these results are adequate and suitable for use in production conditions, in particular for beech wood, which was used for the cost regulations.