Method and apparatus for flattening bamboo wood without flaws

Abstract

A method of spreading bamboo material without cracks and its device. First, remove bamboo green portion and outside nodes, cut open the bamboo sections, remove bamboo yellow portion and inner nodes, preheat to make bamboo sections soft, apply rollers with teeth to press and roll longitude grooves in the inner wall of bamboo material, to extend the arc length of bamboo material, thus flat bamboo material. The bamboo material could be fed along circumference of bamboo or in longitude direction, so there have two kinds of flatting devices: one has a smooth roller, a longitude toothed roller parallel to the smooth roller; another has two rows of rollers, each roller on one of rows has at least two teeth along the circumference, each end of the next roller have at least one more tooth than that of the former roller. when spreading bamboo material with more than 180íÒ,there wouldn't have cracks, then a flat bamboo plate is obtained.

Description

technical field [0001] The invention relates to a technique for flattening bamboo, in particular to a method for flattening bamboo without cracks and a device used therefor. Background technique [0002] In order to obtain wide flat bamboo boards, it is necessary to flatten the bamboo with a curved cross-section after cutting. However, because the fibers of bamboo grow in the axial direction, its tensile capacity in the circumferential direction is extremely weak; and because the structure of bamboo is cylindrical and has a certain thickness, the circumferential lengths of the inner and outer walls are different, and the outer wall The circumferential length of the bamboo is greater than the circumferential length of the inner wall, which brings difficulties to flatten the bamboo, because in order to flatten the bamboo, it is necessary to expand the arc length of the inner wall of the bamboo under the same arc along the circumferential direction to be equal to the outer wall...

AI Technical Summary

Problems solved by technology

The method and equipment for flattening bamboo involved in the above-mentioned patents or applications mainly still directly rely on a little plasticity of the softened bamboo to extend the arc length of the inner wall of the bamboo along the circumferential direction when flattening the bamboo, so that when flattening the bamboo, When the cross-section of bamboo has a large radian (the length difference between the inner and outer wall arc lengths is also large), this point of plasticity is difficult to meet the needs of expanding the arc length of the inner wall of the bamboo along the circumferential direction to equal the arc length of the outer wall of the bamboo. In order to make the bamboo flat, it is necessary to stretch the inner wall of the bamboo along the circumferential direction, so that the inner wall of the bamboo will be subjected to a tensile force along the circumferential direction, which will easily crack the inner wall of the bamboo, and the cracks will often extend to The outer wall of bamboo, so it is difficult for them to avoid cracks when flattening the bamboo with a certain curvature in the section, and it is difficult to obtain a wide flat bamboo board without cracks

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