Influence of some factors on the warping of Pinus caribaea Morelet var. caribaea Barret and Golfari sawn wood

Abstract

The quality of sawn wood is affected by the warping that it presents after drying, it is important then, to understand the mechanisms that regulate this deformation. Consequently, this work offers results of the influence of the variation and sawing patterns, dimensions and drying time of the pieces, on the warping of the sawn wood of Pinus caribaea var caribaea. The sawn pieces come from trees of the same origin, diameter and age. The study of the sawing variation was carried out with a methodology similar to that proposed Center of Forestry Studies, samples were taken with the same length and width but, of different thickness to every third of the selected piece. For the analysis of sawing schemes, sawn pieces were used taking into account the position of the medulla on the face, edge and center of the piece and pieces that do not contain it. The influence of the dimensions, were studied from taking pieces in different positions in radial direction with different dimensions (13 x100x3000) mm and (75x100x3000) mm were coded as: A, B and C by the distance to the medulla. Warpage measurements were made at 25, 60 and 90 days of drying. According to simple analysis of variance, the sawn pieces that experience less warpage are those that not contain medulla, those that do not experience variations in sawing, and those with greater thickness. Warping increases with drying time.