Stacking method used in solid wood board drying

Abstract

The invention discloses a stacking method used in solid wood board drying. The method includes the steps that a log is sawn into boards of various thicknesses, wherein the boards comprise the rough-edge boards and the flat-edge boards, and the thickness of each board is smaller than the width of the board; the solid wood boards are stacked into multiple board stacks in a drying room or an outdoor drying shed, wherein each board stack comprises multiple layers of boards, the boards in each board stack are the same in tree species and thickness, the boards on the lower portions of the board stacks are plain-sawed boards, the boards on the middle portions of the board stacks are semi-plain-sawn boards or radius-sawn boards, the boards on the upper portions of the board stacks are quarter-sawn boards, multiple spacer bars of the same thickness are placed between every two adjacent layers of boards at equal intervals, the spacer bars between the layers are the same in number and corresponding in position, and weights are placed at the tops of the board stacks; tangent lines of annual rings are drawn with the cross sections of the wood boards as reference planes and the intersecting points of the wide-side center lines of the boards and the annual rings as tangent points, wherein the boards with the included angles between the tangent lines and the wide sides of the boards being 0-30 degrees are the plain-sawn boards, the boards with the included angles between the tangent lines and the wide sides of the boards being 30-60 degrees are the semi-pain-sawn boards or radius-saw boards, and the boards with the included angle between the tangent lines and the wide sides of the boards being 60-90 degrees are the quarter-sawn boards.

Description

technical field [0001] The invention relates to a method for stacking solid wood boards when they are dry Background technique [0002] Wood has shrinkage and swelling characteristics, but shrinkage and swelling do not occur in the full range of moisture content changes, only when the moisture content of wood changes between the fully dry state and the fiber saturation point state, the shrinkage and swelling of wood characteristics will be manifested. During the drying process of wood, when the moisture content drops to the fiber saturation point (usually about 30%), as the moisture content continues to decrease, the wood will gradually lose water and dry, and shrinkage will occur. Unlike other homogeneous materials (such as metal, glass, etc.), wood is an anisotropic material. When shrinkage and swelling occur, there are obvious differences in the amount of change along different directions, and the amount of change in the longitudinal direction is 0.1-0.3%. , the change ...

AI Technical Summary

Problems solved by technology

Unlike other homogeneous materials (such as metal, glass, etc.), wood is an anisotropic material. When shrinkage and swelling occur, there are obvious differences in the amount of change along different directions, and the amount of change in the longitudinal direction is 0.1-0.3%. , the change in the radial direction is 3-6%, and the change in the chord direction is 6-12%. The shrinkage size in different directions is different, and the wood will be deformed, and the deformation will increase. The amount of planing will increase, the number of shavings produced will increase, while the volume of solid wood will decrease, and the utilization rate of wood will decrease

In order to reduce the deformation of wood during drying, thereby reducing the processing allowance and improving the utilization rate of wood, scientific researchers have done a lot of research work, but most of the existing achievements focus on the development of wood drying equipment and the adjustment of drying process

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