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Efficient control method of hardness of one-sided surface compressed wood

A control method and technology of compressing wood, which is applied in the direction of wood compression, etc., can solve the problems of large difference in performance of single-sided compressed wood, waste of wood, energy loss, etc., and achieve the goals of saving wood volume, improving production efficiency, and reducing production energy consumption Effect

Inactive Publication Date: 2019-04-16
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the influence of production process parameters on the hardness of one-sided surface compressed wood is not clear, and the properties of one-sided compressed wood prepared by different processes are quite different, which will easily cause waste of wood and unnecessary loss of energy

Method used

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  • Efficient control method of hardness of one-sided surface compressed wood
  • Efficient control method of hardness of one-sided surface compressed wood
  • Efficient control method of hardness of one-sided surface compressed wood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use an X-ray profile density analyzer to detect the single-sided surface compression of poplar (a species of poplar) VDP, the scanning speed is 0.05 mm / s, and the X-ray source voltage is 29 kV; use an electronic universal testing machine to detect single-side surface compression The hardness of wood and uncompressed wood, the radius of the pressing ball is 5.64 mm, the indentation depth is 2.82 mm, and the feed rate is 5 mm / min.

[0031] figure 1 In this implementation, the cross-sectional density distribution (VDP) of the one-sided surface layer of Populus tomentosa is compressed, wherein the distance (PDi) from the peak density position to the compressed surface is 0.85 mm, and the peak density (PD) is 1062.7 kg / m 3 , the thickness of the core dense layer (DTh) is 2.02 mm, PD / DTh is 526, the hardness of the compressed wood on one side of the surface is 3680 Newtons, and the hardness of the uncompressed wood is 1800 Newtons, and the strength-to-weight ratio of the comp...

Embodiment 2

[0033] Use the X-ray profile density analyzer to detect the VDP of the compressed wood on one side of Populus tomentosa, the scanning speed is 0.05 mm / s, and the X-ray source voltage is 29 kV; use the electronic universal testing machine to detect the hardness of the compressed wood and uncompressed wood on the one-sided surface , the radius of the pressing ball is 5.64 mm, the indentation depth is 2.82 mm, and the feed speed is 5 mm / min.

[0034] figure 2 In this implementation, the cross-sectional density distribution (VDP) of the one-sided surface layer of Populus tomentosa is compressed, where PDi is 1.80 mm, and PD is 839.9 kg / m 3 , DTh is 1.96 mm, PD / DTh is 428, the hardness of compressed wood on one side surface is 3060 Newton, and the hardness of uncompressed wood is 1800 Newton, and the strength-to-weight ratio of compressed wood on one side surface is 1.5 times that of uncompressed wood.

Embodiment 3

[0036] Use the X-ray profile density analyzer to detect the VDP of the compressed wood on one side of Populus tomentosa, the scanning speed is 0.05 mm / s, and the X-ray source voltage is 29 kV; use the electronic universal testing machine to detect the hardness of the compressed wood and uncompressed wood on the one-sided surface , the radius of the pressing ball is 5.64 mm, the indentation depth is 2.82 mm, and the feed speed is 5 mm / min.

[0037] image 3 In this implementation, the cross-sectional density distribution (VDP) of the one-sided surface layer of Populus tomentosa, where PDi is 0.15 mm, and PD is 811.0 kg / m 3 , DTh is 1.36 mm, PD / DTh is 596, the hardness of compressed wood on one side surface is 2660 Newton, and the hardness of uncompressed wood is 1800 Newton, and the strength-to-weight ratio of compressed wood on one side surface is 1.3 times that of uncompressed wood.

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Abstract

The invention belongs to the technical field of wood product processing, and discloses an efficient control method of the hardness of one-sided surface compressed wood. The efficient control method ofthe hardness of the one-sided surface compressed wood comprises the steps that a hot pressing method is adopted to prepare the one-sided surface compressed wood by adjusting the hot pressing temperature, the loading speed and the wood compression ratio to control the distance (PDi) of a peak density position from the compressed surface, peak density (PD) and core dense layer thickness (DTh); profile density distribution of the one-sided surface compressed wood is detected, the actual PDi, PD, DTh and ratio of PD to DTh are determined, and the hardness of the one-sided surface compressed woodis obtained. According to the efficient control method of the hardness of the one-sided surface compressed wood, the distance of the peak density position from the compressed surface, the peak densityand the core dense layer thickness are controlled, so that the ratio of the peak density to the core dense layer thickness is (100-800) kg / m<3>: 1 mm, and the hardness of the of the one-sided surfacecompressed wood is controlled. According to the efficient control method of the hardness of the one-sided surface compressed wood, the hardness of the one-sided surface compressed wood can be adjusted according to production requirements, the wood volume is saved, and the production energy consumption and the time cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of wood product processing, and more specifically relates to a method for controlling the hardness of compressed wood on one side of the surface. Background technique [0002] The one-sided surface compression technology can increase the density of soft wood, thereby improving its hardness and wear resistance, so that it can be used in fields such as solid wood floors and furniture, and significantly increase the added value of fast-growing soft wood. Different production processes have different effects on the hardness of unilateral surface compressed wood. M.Gong unilaterally compressed poplar wood at 145-205 °C, the closing time was 4 minutes and 7 minutes, and the compression rates were 9.5%, 17.4% and 24.0 %, the hardness of unilaterally compressed poplar wood is significantly improved, which is 2.4 times higher than that of uncompressed poplar wood. At the same time, studies have shown that hot pressin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27M1/02
CPCB27M1/02
Inventor 涂登云周桥芳宋杰
Owner SOUTH CHINA AGRI UNIV
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