Vices lumber

Conditions in which the tree grows and develops, not only affect the texture of its wood, but also lead to different deviations from the structure and development of the barrel. This, in turn, can cause the presence of various defects, which impose limitations on the scope of the timber. These abnormalities include a variety of curved trees, burls, knots and forks along its length, causing disturbances in the very texture, changing its color and affect the mechanical strength of wood. Cracks appear in the wood as it grows. For their education affect environmental factors and internal stresses arising in the trunk. Distinguish frosty, and otlupnye metikovye cracks. Frost cracks appear in the expansion of internal moisture in severe frosts. The result is a cross-cutting cracks directed radially. Internal stresses arising in the trunk, give rise to otlupnyh (separation from each other's growth rings) and metikovyh (going along the trunk from the butt to the top) cracks. In addition, when drying wood can cause cracks resulting from shrinkage. Knots appear in place of sprouting branches and significantly reduce the value of timber. In the field of knots reduces the mechanical strength of wood as drying to the mote loses contact with the base and weakens the structure. In addition, the knots have an impact on the appearance of wood grain meant for a transparent finish. Roe (the slope of the fibers) is a different deviation of the direction of the fibers from the longitudinal axis of the tree. Wood is such a bad vice perceives a transverse load. The varieties include curly gain kososloya (wavy fiber placement) and curl (local curvature of growth rings). Bark - a defect at the site of the tree resulting from mechanical damage to tissue. This section of wood spoils the appearance and makes it difficult to finish. Often at this point there are fungal spots and pitching. Fungal lesions of wood are the result of exposure to putrefactive processes. As a result, changing the mechanical properties of wood and wood color tones.