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Stable enhanced type solid wood profile and production method thereof

A production method and enhanced technology, applied in the direction of wood impregnation, impregnated wood, wood processing equipment, etc., can solve the problems of accelerating hemicellulose, cellulose degradation, reducing the mechanical properties of wood, and large residual stress of wood, so as to eliminate stress , Reduce drying defects, reduce surface polarity

Active Publication Date: 2010-11-10
ZHEJIANG SHIYOU TIMBER
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0009] In addition, if the traditional drying method is used to dry the moisture content of the wood to below 5.0%, it is easy to make the wood form a gradient of high internal moisture and low external moisture, and the internal residual stress of the wood is large, causing the acetylated wood to warp and deform. Reduce yield
And even if the moisture content of the dried wood is lower than 5.0% and placed indoors, because the wood has a large number of new hydroxyl groups, it is easy to absorb moisture in the air, so that the moisture content of the wood will soon return to more than 5%, which is not only Accelerating the hydrolysis of acetic anhydride will also accelerate the degradation of hemicellulose and cellulose, greatly reducing the mechanical properties of wood

Method used

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  • Stable enhanced type solid wood profile and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a. Drying treatment: The southern pine boards with a specification of 4000×150×50mm are stacked in a drying kiln with glass walls on the east, west and south sides, with solar energy as the main heat source and hot gas from burning fuel As an auxiliary heat source, use sprinklers and ventilation holes to adjust the humidity, and use fans to cause forced circulation to achieve the purpose of drying, so that the moisture content of the wood is as low as 6.0%, the deviation of the moisture content in the thickness of the wood is less than 2.0%, and the internal residual stress of the wood is 2.0%. ;

[0043] b. Carbonization treatment: neatly stack the dried wood and press 1t / m on the top of the wood pile 2 The standard pressurized steel plate frame pours concrete briquettes, and then puts them into the wood carbonization equipment, heats up and humidifies rapidly, the temperature rises to 90°C, and the humidity is humidified to 80% relative humidity, keep for 4 hours, and...

Embodiment 2

[0049] a. Drying treatment: Pile poplar wood with a specification of 930×125×22mm in a drying kiln with glass walls on the east, west and south sides, use hot water or steam as the drying medium, and use water spray The humidity is adjusted by the device and ventilation holes, and the fan is used to cause forced circulation to achieve the purpose of drying, so that the moisture content of the wood is as low as 5.0%, the moisture content deviation of the wood thickness is 1.5%, and the internal residual stress of the wood is 1.8%;

[0050] b. Carbonization treatment: neatly stack the dried wood and press 1t / m on the top of the wood pile 2 The standard pressurized steel plate frame pours concrete briquettes, and then puts them into the wood carbonization equipment, heats up and humidifies rapidly, the temperature rises to 80°C, and the humidity is humidified to 70% relative humidity, keep for 2 hours, and then adopt the stepwise heating method according to Raise the temperature ...

Embodiment 3

[0057] a. Drying treatment: put the longan with a specification of 2000×200×32mm in a vacuum tank to heat and evacuate the wood, resulting in a water vapor pressure difference from the inside of the wood to the surface and from the surface to the outside; due to the water vapor pressure in the wood The boiling point of water is lowered under vacuum, and it is easy to gasify, so that the water is easily evaporated from the wood and extracted from the vacuum tank, so that the wood moisture content is as low as 8.0%, the moisture content deviation of the wood thickness is 1.0%, and the internal residual stress of the wood is 1.0% %;

[0058] b. Carbonization treatment: neatly stack the dried wood and press 1t / m on the top of the wood pile 2 The standard pressurized steel plate frame pours concrete briquettes, and then puts them into the wood carbonization equipment, heats up and humidifies rapidly, the temperature rises to 85°C, and the humidity is humidified to 75% relative humi...

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Abstract

The invention provides a production method of a stable enhanced type solid wood profile improved by a wood carbonization and acetylation process, which belongs woodwork production technique. The production method comprises the following steps of: a, drying treatment, wherein the wood moisture content is reduced to be as low as 5.0 to 8.0 percent, the moisture content deviation in the wood thickness is less than 2.0 percent, and the wood internal residual stress is less than 2.0 percent; b, carbonizing treatment; c, acetylation treatment; and d, equalization treatment. The invention also discloses a stable enhanced type solid wood profile prepared by the production method. The solid wood profile prepared by the method is stable, has high corrosion resistance and weathering resistance, high output, long product service life and wide utilization ways, is favorable for realizing flow line production, and is convenient for industrialization.

Description

technical field [0001] The invention relates to a stable and enhanced solid wood profile improved through wood carbonization and acetylation processes and a production method thereof, which belongs to the production technology of wood products. Background technique [0002] As a renewable resource, wood is more and more valued by people, but the anisotropy of wood itself makes wood prone to warping, cracking, deformation, perishability, mildew, and short service life during use, especially fast-growing wood. , these wood defects are more serious, thereby limiting the use of wood. Therefore, in order to improve the dimensional stability of wood and prolong the service life of wood, people have carried out many scientific research activities on the improvement of wood function. [0003] In the 1990s, Finland, the Netherlands, France and Germany began to conduct research on carbonized wood (scientific name: heat-treated wood or heat-modified wood). The typical process is to im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27M1/08B27K3/52
Inventor 潘成锋倪月忠劳奕旻朱月虎董昊杨莎杜超
Owner ZHEJIANG SHIYOU TIMBER
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