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A wood compression-in-situ pressure heat treatment integrated method and the compressed wood prepared therefrom

A compression treatment and wood technology, applied in wood heat treatment, wood compression, wood treatment, etc., can solve problems such as inability to apply, environmental pollution, etc., and achieve control of mechanical strength loss, high heat dissipation efficiency, and reduced water vapor partial pressure. Effect

Active Publication Date: 2021-01-19
GUANGXI NANNING QIAOSHENG WOOD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two disclosed methods can reduce the loss of mechanical strength of heat-treated wood, the addition of chemicals during the treatment process is likely to cause pollution to the environment, and at the same time cannot be applied to the post-treatment and fixed deformation of mechanically compressed wood.

Method used

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  • A wood compression-in-situ pressure heat treatment integrated method and the compressed wood prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Dry Thai rubberwood sawn timber with a size of 1000×110×24mm to a moisture content of 12%, and after double-sided planing, the final thickness is 20.5mm;

[0034] (2) Lay 20.5mm thick rubber wood boards neatly in a single row between the platens of the hot press, place 4 pieces at a time, conduct a total of 3 tests, and place 18mm thickness gauges on both sides of the board;

[0035] (3) Turn on the heating system and pressurization system of the hot press, set the pressure to 1.2 MPa, set the temperature to 135°C, heat up at a rate of 100°C / hour, heat for 90 minutes, and the moisture content of the wood is reduced to -1.1%. Online measurement of wood core temperature reaches 135°C;

[0036] (4) After the heating stage ends, the pressure of the press is increased to 10 MPa, the wood is compressed to the target thickness within 60 seconds, the pressure is kept for 300 seconds, and then the pressure is completely released within 60 seconds; The pressure of the press ...

Embodiment 2

[0042] (1) Dry poplar boards with a size of 930×120×26mm until the moisture content is 10%, and the final thickness is 24mm;

[0043] (2) Lay 24mm thick poplar boards neatly in a single row between the pressing plates of the hot press, place 4 pieces each time, and carry out 3 tests in total, and place 20mm thickness gauges on both sides of the board;

[0044] (3) Turn on the heating system and pressurization system of the hot press, set the pressure to 2 MPa, set the temperature to 120°C, heat up at a rate of 100°C / hour, heat for 75 minutes, and the moisture content of the wood is reduced to -0.9%. Online measurement of wood core temperature up to 120°C;

[0045] (4) After the heating stage ends, the pressure of the press is raised to 12 MPa, and the wood is compressed to the target thickness within 45 seconds, held for 300 seconds, and then completely relieved within 45 seconds; The pressure of the press is increased to 6 MPa within 30 seconds, the pressure is kept for 420 ...

Embodiment 3

[0051] (1) Drying the masson pine plate with a size of 980×105×23.5mm to a moisture content of 15%, and a final thickness of 22mm;

[0052] (2) Lay 22mm thick masson pine boards neatly in a single row between the platens of the hot press, place 4 pieces at a time, carry out 3 tests in total, and place 20mm thickness gauges on both sides of the board;

[0053] (3) Turn on the heating system and pressurization system of the hot press, set the pressure to 0.6 MPa, set the temperature to 150°C, heat up at a rate of 100°C / hour, heat for 100 minutes, and the moisture content of the wood is reduced to -1.6%. Online measurement of the core temperature of the wood reaches 148°C;

[0054] (4) After the heating stage ends, the pressure of the press is increased to 8 MPa, and the wood is compressed to the target thickness within 45 seconds, kept under pressure for 300 seconds, and then completely relieved within 45 seconds; The pressure of the press is increased to 4 MPa within 30 second...

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Abstract

The invention discloses an integrated method of wood compression-in-situ pressure heat treatment and the compressed wood prepared therefrom. The method comprises the following steps: (1) drying stage; (2) paving; (3) heating; (4) ) two-stage pressure compression treatment; (5) heat treatment; (6) stress relief; (7) unloading. The invention can greatly improve the overall compression quality of wood, and can control the compression rebound of wood, improve the flatness of treated wood, has no chemical pollution in the treatment process, low production cost, relatively simple operation, and has the advantages of high efficiency, environmental protection and the like. Realize the overall compression and deformation permanent fixation of wood. This method can improve the mechanical properties and dimensional stability of wood, and at the same time overcome the shortcomings of heat-treated wood's poor bending strength and screw-holding force.

Description

technical field [0001] The invention belongs to the technical field of wood product production technology, and more specifically relates to an integrated method of wood compression-in-situ pressure heat treatment and compressed wood prepared therefrom. Background technique [0002] With the growth of population and the improvement of people's living standards, people's demand for wooden products continues to grow. In the past five years, the average annual timber consumption in my country has exceeded 140 million m 3 , of which about 70 million m of wood is imported from abroad each year 3 , foreign dependence as high as 50%. my country's plantation forest timber resources are very rich. According to the Eighth National Forest Resources Census (2009-2013), the existing plantation forest area is 69 million hectares, and the stock volume is 2.483 billion m 3 , ranking first in the world. However, fast-growing plantation wood has low density, soft material and poor stabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27M1/02B27D1/08B27K5/00
CPCB27D1/08B27K5/001B27K5/0085B27M1/02B27K5/065B27K5/007
Inventor 周桥芳涂登云胡传双云虹章伟伟古今关丽涛
Owner GUANGXI NANNING QIAOSHENG WOOD
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