Treatment process for improving dimensional stability of Chinese fir logs

A technology of dimensional stability and processing technology, applied in the direction of wood treatment, wood heat treatment, wood treatment details, etc., can solve the problem of limited improvement of fir stability, and achieve improved fir stability, reduced porosity, and improved dimensional stability. Effect

Inactive Publication Date: 2019-08-27
JIAHAOJIA ENERGY CONSERVATION DOORS & WINDOWS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But only conventional heat treatment is still limited to improve the stability of Chinese fir

Method used

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  • Treatment process for improving dimensional stability of Chinese fir logs
  • Treatment process for improving dimensional stability of Chinese fir logs
  • Treatment process for improving dimensional stability of Chinese fir logs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A treatment process for improving the dimensional stability of fir logs, comprising the following steps:

[0041] (1) the moisture content of the Chinese fir log with a diameter of 170-180mm is controlled between 40-55%; then the Chinese fir log is placed in a drying room, and the ambient temperature is adjusted to 65-70°C, and the ambient humidity is 45-60%. In this environment, let the fir logs stand for 15h; then cool down to room temperature.

[0042] (2) Chinese fir logs are placed in a sodium carbonate solution with a mass concentration of 2.7%, and an appropriate amount of sucrose is added so that the mass concentration of sucrose in the sodium carbonate solution is 4.5%, pressurized at room temperature, and the pressurized pressure is 0.55MPa , the pressurization time is 100min, and then the pressure is released, and the fir logs are taken out.

[0043] (3) After soaking fir logs in glycerin at room temperature for 3 hours, slowly raise the temperature of glyce...

Embodiment 2

[0046] A treatment process for improving the dimensional stability of fir logs, comprising the following steps:

[0047] (1) the moisture content of the Chinese fir log with a diameter of 100-110mm is controlled between 40-55%; then the Chinese fir log is placed in a drying room, and the ambient temperature is adjusted to 65-70°C, and the ambient humidity is 45-60%. In this environment, let the fir logs stand for 16h; then cool down to room temperature.

[0048] (2) Chinese fir log is placed in the sodium carbonate solution that mass concentration is 2.7%, and adds appropriate amount of sucrose, makes the mass concentration of sucrose in sodium carbonate solution 4.5%, pressurizes at normal temperature, and pressurization pressure is 0.6MPa, The pressurization time is 60 minutes, and then the pressure is released, and the fir logs are taken out.

[0049](3) After soaking fir logs in glycerin at room temperature for 1.5 hours, slowly raise the temperature of glycerin to 110°C ...

Embodiment 3

[0052] A treatment process for improving the dimensional stability of fir logs, comprising the following steps:

[0053] (1) the moisture content of the Chinese fir log with a diameter of 60-70mm is controlled between 40-55%; then the Chinese fir log is placed in a drying room, the ambient temperature is adjusted to 65-70°C, and the ambient humidity is 45-60%, In this environment, let the fir logs stand for 12h; then cool down to room temperature.

[0054] (2) Chinese fir logs are placed in a sodium carbonate solution with a mass concentration of 3.2%, and an appropriate amount of sucrose is added, so that the mass concentration of sucrose in the sodium carbonate solution is 5.5%, pressurized at room temperature, and the pressurized pressure is 0.6MPa , the pressurization time is 60min, and then the pressure is released, and the fir logs are taken out.

[0055] (3) After soaking fir logs in glycerin at room temperature for 1 hour, slowly raise the temperature of glycerin to 1...

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Abstract

The invention provides a treatment process for improving the dimensional stability of Chinese fir logs. The treatment process comprises the following steps: (1) controlling the moisture content to be40 to 55 percent; adjusting the ambient temperature to 65 to 70 DEG C and the ambient humidity to 45 to 60 percent, placing for 12 to 16 h, and cooling to a room temperature; (2) putting the Chinese fir logs in a sodium carbonate solution at a mass concentration of 2 to 3.2 percent, adding sucrose at a mass concentration of 3 to 5.5 percent, and pressurizing the solution at a normal temperature and a pressurizing pressure of 0.45 to 0.6 MPa for pressurizing time of 60 to 150 min; (3) after the product is immersed in glycerin at a normal temperature for 1 to 5 h, heating to 110 DEG C, performing pressurization to 0.3 to 0.45 MPa at first, maintaining the pressure for 10 to 60 min, then performing pressurization to 0.7 to 0.8 MPa, maintaining the pressure for 30 to 110min, cool to a room temperature, and taking out the product; and(4) placing the product in silicone oil, heating to 135 to 145 DEG C, immersing the product for 1 to 5 h, taking out the product, drying the product in the shade. The treatment method performs combined treatment by an alkaline sucrose solution, hot glycerin and hot silicone oil, which can effectively improve the dimensional stability of the Chinese fir logs.

Description

technical field [0001] The invention relates to the technical field of wood treatment, in particular to a treatment process for improving the dimensional stability of fir logs. Background technique [0002] Wood is a good elastic-plastic material, and because of its light weight and impact resistance, it has become one of the earliest building materials used by humans. As an important building material, it not only consumes less energy in processing, but also has little environmental pollution. It is an ideal material for the strategic conception of sustainable development in today's society. [0003] Wood is mainly composed of cellulose, hemicellulose and lignin. There are a large number of hydroxyl groups on the cellulose and hemicellulose molecules, so that the moisture inside the wood will change with the change of ambient temperature and humidity, and the moisture inside the wood will change. In the process of desorption or moisture absorption, the wood will shrink and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/02B27K3/52B27K3/00B27K3/08B27K3/36B27K5/00
CPCB27K3/005B27K3/0214B27K3/025B27K3/08B27K3/36B27K3/52B27K5/001B27K5/0085B27K2240/70
Inventor 吴卫明李瑞李强美
Owner JIAHAOJIA ENERGY CONSERVATION DOORS & WINDOWS
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