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A kind of environment-friendly one-side surface reinforced stable wood and its preparation method

A stable, wood-based technology, applied in chemical instruments and methods, wood heating, wood treatment, etc., can solve problems such as the chord-radial shrinkage ratio of polluted modified wood, achieve synchronous improvement of hardness and dimensional stability, and improve stability Sexuality, the effect of simple realization process

Active Publication Date: 2021-05-11
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses asymmetric heating method and surface strengthening method to soften and compress the outer surface of the chord-sheared board, and then modulates the moisture content of the wood that is compressed and strengthened on one side surface, which overcomes the pollution problems in the prior art and obtains Technical Problems of Large Shrinkage Ratio in Chord and Radial Diameter of Modified Wood

Method used

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  • A kind of environment-friendly one-side surface reinforced stable wood and its preparation method
  • A kind of environment-friendly one-side surface reinforced stable wood and its preparation method
  • A kind of environment-friendly one-side surface reinforced stable wood and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, poplar wood is subjected to unilateral surface strengthening treatment, and the poplar wood used is a string-cut board, β 1 is 28°, β 2 60°, chord-radial shrinkage ratio of 1.88, initial moisture content of 8%, and average air-dry density of 0.48g / cm 3 .

[0033] (1) Thermal field control: heat up the hot plate to a target temperature of 180°C, stabilize the temperature at the target temperature of 180°C, and keep the temperature of the cold plate at 20°C.

[0034] (2) Compression strengthening: place the inner surface layer of poplar wood on the cold plate, close the press, the outer surface layer of the wood is in contact with the hot plate, and the press compresses the wood to the target thickness in 240 seconds, the compression amount is 8mm , to prepare the reinforcement layer on the outer surface, the preparation process is as follows figure 1 shown.

[0035] (3) Deformation fixation: Raise the temperature of the hot plate to the target temper...

Embodiment 2

[0040] In this embodiment, poplar wood is subjected to one-sided surface strengthening treatment. The poplar wood used is the string cut board, β 1 is 25°, β 2 68°, chord-radial shrinkage ratio 2.09, initial moisture content 13%, average air-dry density 0.50g / cm 3 .

[0041] (1) Thermal field control: heat up the hot plate to a target temperature of 150°C, stabilize the temperature at the target temperature of 150°C, and keep the temperature of the cold plate at 40°C.

[0042] (2) Compression strengthening: the poplar wood is placed on the cold plate, the press is closed, the outer surface layer of the wood is in contact with the hot plate, and the press compresses the wood to the target thickness in 10 seconds, the compression amount is 5mm, and the outer plate is obtained. The strengthening layer of the board surface, the preparation process is as follows figure 1 shown.

[0043] (3) Deformation fixation: Raise the temperature of the hot plate to the target temperature ...

Embodiment 3

[0047] In this example, Okoume wood is strengthened on one side of the surface, and the Okoume wood used is a string-cut board, β 1 is 20°, β 2 65°, chord-radial shrinkage ratio of 1.93, initial moisture content of 11%, and average air-dry density of 0.45g / cm 3 .

[0048] (1) Thermal field control: heat up the hot plate to a target temperature of 130°C, stabilize the temperature at the target temperature of 130°C, and keep the temperature of the cold plate at 30°C.

[0049] (2) Compression strengthening: put the Okoume wood on the cold plate, close the press, the outer surface of the wood is in contact with the hot plate, and the press compresses the wood to the target thickness in 120 seconds, the compression amount is 5mm, and the obtained The reinforcement layer on the outer surface, the preparation process is as follows: figure 1 shown.

[0050] (3) Deformation fixation: Raise the temperature of the hot plate to the target temperature of 200°C and keep the temperature ...

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Abstract

The invention discloses an environment-friendly one-sided surface layer reinforced stable wood and a preparation method thereof. The two sides of the single-side surface-strengthened stable wood are the outer surface reinforcement layer and the inner surface layer, and the ratio of the chord shrinkage rate of the outer surface reinforcement layer to the radial shrinkage rate of the inner surface layer is 1.4~ 1.7; the ratio of the hardness of the outer surface reinforcement layer to the hardness of the inner surface layer is 1.5 to 2.4, and the ratio of the moisture content of the inner surface layer to the moisture content of the outer surface reinforcement layer is 1.35 to 2.2; the water content of the inner surface layer The water content of the reinforced layer on the outer surface is 7-15%, and the moisture content of the reinforced layer on the outer surface is 4-11%. Angle β 1 , 0°≤β 1 ≤30°, the tangent at the intersection of the innermost annual ring passing through the inner surface layer and the inner surface layer forms an angle β with the inner surface layer 2 , 60°≤β 2 ≤90°. The invention improves the hardness and stability of one side surface layer 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 one-sided surface layer reinforced stable wood and a preparation method thereof. Background technique [0002] At present, my country has completely stopped commercial logging of natural forests, and the timber structure has gradually changed from natural forests to low-density fast-growing timber. However, fast-growing wood has disadvantages such as low density, low wood hardness, and poor dimensional stability. It is mainly used in the fields of plywood, pulp and paper, and logistics packaging, and the degree of utilization of solid wood is not high. At the same time, wood is a kind of natural porous hygroscopic material. During use, the wood moisture content will change with the change of the relative humidity of the environment. And because of the anisotropic performance of wood shrinkag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27D1/04B27D1/08B27K5/06B27K5/00B32B21/13B32B21/14B32B33/00
CPCB27D1/04B27D1/08B27K5/001B27K5/007B27K5/06B32B21/13B32B21/14B32B33/00B32B2307/536B32B2307/734
Inventor 涂登云陈川富周桥芳云虹朱志鹏
Owner SOUTH CHINA AGRI UNIV
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