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A kind of environment-friendly stable wood and its surface thermal modification method

A stable, heat-modified technology, applied in wood heating, wood treatment, wood layered products, etc., can solve the problems of the chord-radial shrinkage ratio of polluted modified wood, and achieve improved dimensional stability and decorative performance, Effect of improving dimensional stability and improving stability

Active Publication Date: 2021-09-03
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method utilizes an asymmetrical heat treatment method to thermally modify the outer surface of the chord-sawn board, and then modulates the moisture content of the thermally modified wood, which overcomes the pollution problem existing in the prior art and obtains modified wood chords. Technical problem of large radial dry shrinkage ratio

Method used

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  • A kind of environment-friendly stable wood and its surface thermal modification method
  • A kind of environment-friendly stable wood and its surface thermal modification method
  • A kind of environment-friendly stable wood and its surface thermal modification method

Examples

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Effect test

Embodiment 1

[0032] In this example, Thai rubber wood is modified, and the rubber wood used is a string-cut board, β 1 is 25°, β 2 It is 70°, the chord radial shrinkage ratio is 2.14, and the initial moisture content is 0%.

[0033] (1) Preheating: the hot plate is heated up to the target temperature of 280°C, and the temperature is stabilized at the target temperature of 280°C, and the temperature of the cold plate is 60°C.

[0034] (2) Feeding: Push the Thai rubber wood into the cold and hot plates, and let the outer surface of the wood be in contact with the hot plate, and the inner surface of the wood be in contact with the cold plate, and the wood is pushed in for 3 seconds.

[0035] (3) Insulation: After the wood is pushed into the cold and hot plates, close the heat plate, make the heat plate contact with the surface of the wood outer plate for heat treatment, keep the target temperature of the heat plate at 280°C, and keep the temperature of the cold plate at 60°C; apply a pressur...

Embodiment 2

[0041] The rubber wood used in this embodiment is a string cut board, β 1 is 20°, β 2 It is 65°, the shrinkage ratio of chord and radial direction is 1.98, and the initial moisture content is 2%.

[0042] (1) Preheating: heat up the hot plate to the target temperature of 290°C, stabilize the temperature at the target temperature of 290°C, and keep the temperature of the cold plate at 65°C.

[0043] (2) Feeding: Push the wood into the cold and hot plates, and let the outer surface of the wood contact the hot plate, and the inner surface of the wood contact the cold plate. The time for pushing the wood is 3 seconds.

[0044] (3) Heat preservation: After the wood is pushed into the cold and hot plates, close the heat plate, make the heat treatment in contact with the surface of the wood outer plate, keep the target temperature of the heat plate at 290°C, and keep the temperature of the cold plate at 70°C; apply a pressure of 0.2MPa, to ensure that the hot plate is closely attac...

Embodiment 3

[0048] The Mandshurica mandshurica used in this embodiment is a string cutting board, β 1 is 27°, β 2 It is 64°, the chord radial shrinkage ratio is 1.83, and the initial moisture content is 2%.

[0049] (1) Preheating: the hot plate is heated to the target temperature of 270°C, and the temperature is stabilized at the target temperature of 290°C, and the temperature of the cold plate is 80°C.

[0050] (2) Feeding: push the wood of Mandshurica mandshurica into the cold and hot plates, and allow the outer surface of the wood to contact the hot plate, and the inner surface of the wood to contact the cold plate, and the time for pushing the wood is 3 seconds .

[0051] (3) Heat preservation: after the wood is pushed into the cold and hot plates, close the heat plate, make the heat plate contact with the surface layer of the wood outer plate for heat treatment, keep the target temperature of the heat plate at 290°C, and keep the temperature of the cold plate at 80°C; apply a pre...

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Abstract

The invention discloses an environment-friendly stable wood and a method for thermally modifying the surface layer thereof. The surface layers on both sides of the environment-friendly stable wood are an outer plate surface layer and an inner plate surface layer respectively, and the chord drying shrinkage of the outer plate surface layer is the same as that of the inner plate surface layer. The ratio of the radial drying shrinkage of the inner plate surface layer is 1.2 to 1.7, the ratio of the moisture content of the inner plate surface layer to the moisture content of the outer plate surface layer is 1.35 to 2.2, and the moisture content of the inner plate surface layer is 7 to 1.7. 15%, the moisture content of the surface layer of the outer plate is 4-11%, and the tangent line passing through the intersection of the outermost annual ring of the surface layer of the outer plate and the surface layer of the outer plate forms an angle β with the surface layer of the outer plate 1 , 0°≤β 1 ≤30°, the tangent at the intersection of the innermost annual ring passing through the surface of the inner plate and the surface of the inner plate forms an angle β with the surface of the inner plate 2 , 60°≤β 2 ≤90°. The method has no chemical pollution in the treatment process, high production efficiency, low cost, simple operation, and has the advantages of high efficiency and environmental protection. Can greatly improve the dimensional stability and decorative properties of wood.

Description

technical field [0001] The invention belongs to the technical field of wood modification and wood product production technology, and more specifically relates to an environment-friendly and stable wood and a surface heat modification method thereof. Background technique [0002] Wood is a kind of natural porous hygroscopic material, and the moisture content of wood will change with the change of environmental relative humidity during use. And because wood is an anisotropic natural material, when the moisture content of wood changes, the wood will have different dimensional changes in the chord direction, radial direction and grain direction. Usually the longitudinal direction is the smallest, and the total dry shrinkage rate is about 0.1-0.3%, which has little effect on the deformation of wood and can be ignored in wood processing. The radial center is about 4.5-8%, and the chord-wise maximum is about 8-12%. For most of the boards close to the pith center, the outer surfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27D1/00B27D3/00B27K5/00B32B21/13B32B37/06B32B38/00
CPCB27D1/00B27D3/00B27K5/001B32B21/13B32B37/06B32B38/0036B32B2307/734
Inventor 涂登云赵湘玉周桥芳陈川富关丽涛古今
Owner SOUTH CHINA AGRI UNIV
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