ESTIMATION METHOD OF FLATNESS DEVIATION ALONG FACE (TWIST WARP) OF SAWN WOOD Russian patent published in 2009 - IPC G01B5/28 

FIELD: wood-working industry.

SUBSTANCE: estimation method of flatness deviation along the face of sawn wood pertains to wood processing and may be used for estimation of twist warp of sawn wood. Twist warp of sawn wood may be estimated by the angle of mutual turn of control sections as an algebraic difference of their flatness deviations, as well as by mutual deviation of their end points as a product of sections mutual turn angle multiplied by width of sawn wood, for any pair of control sections, the biggest values whereof may be chosen; and any local deviations necessary for the analyses. Checked sawn wood is placed on three horizontal supports with one of them (the principle one) placed perpendicular to the longitudinal axis of the sawn wood at the middle of its length, and two auxiliary ones - along its axis to support its ends allowing their free rotation. Flatness deviation is measured in control sections by means of a level placed across the axis.

EFFECT: simplification and facilitation of the estimation method, ensured measurement in any cross section of the sawn wood along its entire length, minimising its deformation under its weight and weight of the measuring tools, elimination of application of costly direct bases (flat plate or checking ruler).

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