Method for controlling deformation of wood products (3)
2024-04-18 12:07:26
Saw control method
In the process of sawing wood logs, the reasonable sawing method can be used to control the deformation of sawn timber. 3.1 Cutting by sawing method
The sawing method of the diameter cut means that the sawing edge is directed toward the core of the heart, and the saw is radiated along the radius of the annual ring. For most tree species that are prone to deformation, the kerf sawing method overcomes or reduces the buckling, warping and distortion caused by the sawn timber during sawing. This is because the material of the diameter cutting board is relatively uniform and the fiber structure is regularly arranged. A tree species with wood rays has a supporting effect on the ray cells and a small deformation. However, logs with large residual growth stress have a slightly larger transverse transverse curvature. After the test, for the re-cut sawn timber, the saw blade is first cut and then cut, which is smaller than the deformation after cutting the saw blade. The new three-open, four-open, and I-type sawing methods can improve the yield of the cutting board.
3.2 Stress wood sawing method
The stress tree with a wide annual ring should be sawed so that the saw blade is perpendicular to the long diameter of the log, so that the annual rings on the same sawn timber are as uniform as possible to improve the stability of the sawn timber. In addition, it should be pulled in wood because it contains more un-lignified colloidal wood fiber. It is easy to fluff and clip saw when sawing, which causes bending or warping. Therefore, the quality of saw blade grinding and the treatment before processing should be improved.
3.3 Control method of twill deformation
Twill is an important cause of deformation or even distortion of sawn timber. The production of twill sawn timber is available in both natural and man-made forms, and sawn timber with twisted logs has natural twill. The twisted logs are usually sawn into thick plates or squares to avoid sawing the sheets. The artificial twill sawn timber is sawn when the saw is not parallel to the tree shaft, or when the sawing is re-cut, the kerf and the fiber direction are at an angle, which can be avoided by changing the sawing method, but sometimes to improve the yield. For the species with less deformation, it is also allowed to use the "one side extrusion" sawing method of the outer surface of the parallel log.
4 Wood modification method
The modification of sawn timber or wood parts by physical and chemical methods can also achieve the purpose of controlling deformation. Since the modification treatment needs to increase the production cost, it is used when the product has special requirements.
In the process of sawing wood logs, the reasonable sawing method can be used to control the deformation of sawn timber. 3.1 Cutting by sawing method
The sawing method of the diameter cut means that the sawing edge is directed toward the core of the heart, and the saw is radiated along the radius of the annual ring. For most tree species that are prone to deformation, the kerf sawing method overcomes or reduces the buckling, warping and distortion caused by the sawn timber during sawing. This is because the material of the diameter cutting board is relatively uniform and the fiber structure is regularly arranged. A tree species with wood rays has a supporting effect on the ray cells and a small deformation. However, logs with large residual growth stress have a slightly larger transverse transverse curvature. After the test, for the re-cut sawn timber, the saw blade is first cut and then cut, which is smaller than the deformation after cutting the saw blade. The new three-open, four-open, and I-type sawing methods can improve the yield of the cutting board.
3.2 Stress wood sawing method
The stress tree with a wide annual ring should be sawed so that the saw blade is perpendicular to the long diameter of the log, so that the annual rings on the same sawn timber are as uniform as possible to improve the stability of the sawn timber. In addition, it should be pulled in wood because it contains more un-lignified colloidal wood fiber. It is easy to fluff and clip saw when sawing, which causes bending or warping. Therefore, the quality of saw blade grinding and the treatment before processing should be improved.
3.3 Control method of twill deformation
Twill is an important cause of deformation or even distortion of sawn timber. The production of twill sawn timber is available in both natural and man-made forms, and sawn timber with twisted logs has natural twill. The twisted logs are usually sawn into thick plates or squares to avoid sawing the sheets. The artificial twill sawn timber is sawn when the saw is not parallel to the tree shaft, or when the sawing is re-cut, the kerf and the fiber direction are at an angle, which can be avoided by changing the sawing method, but sometimes to improve the yield. For the species with less deformation, it is also allowed to use the "one side extrusion" sawing method of the outer surface of the parallel log.
4 Wood modification method
The modification of sawn timber or wood parts by physical and chemical methods can also achieve the purpose of controlling deformation. Since the modification treatment needs to increase the production cost, it is used when the product has special requirements.
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