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Environmental-friendly unilateral surface layer reinforced stable wood and preparation method thereof

A stable and wood-based technology, applied in chemical instruments and methods, wood treatment, wood heating, etc., can solve the problems of the chord-radial shrinkage ratio of polluted modified wood, achieve improved hardness and dimensional stability, simple process, The effect of low energy consumption

Active Publication Date: 2019-08-23
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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  • Environmental-friendly unilateral surface layer reinforced stable wood and preparation method thereof
  • Environmental-friendly unilateral surface layer reinforced stable wood and preparation method thereof
  • Environmental-friendly unilateral surface layer reinforced stable wood and preparation method thereof

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 environmental-friendly unilateral surface layer reinforced stable wood and a preparation method thereof. Two side surface layers of the unilateral surface layer reinforced stable wood are an outer board reinforcement layer and an inner board layer; a ratio between the chordwise dry shrinkage rate of the outer board reinforcement layer and the radial dry shrinkage rate of the inner board layer is 1.4 to 1.7; a ratio between the hardness of the outer board reinforcement layer and the hardness of the inner board layer is 1.5 to 2.4; a ratio between the moisture content ofthe inner board layer and the moisture content of the outer board reinforcement layer is 1.35 to 2.2; the moisture content of the inner board layer is 7 to 15 percent; the moisture content of the outer board reinforcement layer is 4 to 11 percent; an included angle beta 1 is formed between a tangent line passing through an intersection point part of an outermost-layer annual ring of the outer board reinforcement layer and the outer board reinforcement layer and the outer board reinforcement layer, and is larger than or equal to 0 degrees and less than or equal to 30 degrees; and an included angle beta 2 is formed between a tangent line passing through an intersection point part of an innermost-layer annual ring of the inner board layer and the inner board layer and the inner board layer, and is larger than or equal to 60 degrees and less than or equal to 90 degrees. According to the environmental-friendly unilateral surface layer reinforced stable wood and the preparation method thereof provided by the invention, the unilateral surface layer hardness and the stability of the wood are improved.

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 Applications(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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