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Wood heat treatment method

A wood heat treatment and heat treatment method technology, applied in the field of wood heat treatment, can solve the problems of large decline in wood strength, difficulty in obtaining products with uniform quality, and reducing the value of treated wood, so as to reduce the loss of wood strength and expand the scope of use. The effect of improving performance

Active Publication Date: 2008-07-23
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat treatment process only controls the temperature during the treatment process, and the intermediate steaming treatment is carried out intermittently without basis, which is relatively random, and it is difficult in product quality control, and it is difficult to obtain products with uniform quality
And because the process does not require oxygen content, the wood will be oxidized during the treatment process due to the participation of oxygen in the high temperature treatment section, so that the strength of the wood will be greatly reduced, thereby limiting the use range of heat-treated wood and reducing Value of treated wood

Method used

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  • Wood heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] 1) Pile the poplar wood 9 with a thickness of 50 mm to be processed in the airtight space formed by the equipment housing 4 according to the wood drying method;

[0020] 2) Turn on the equipment circulation fan 5 to make the hot air medium circulate in the material pile at a speed of 1m / s in the processing equipment space;

[0021] 3) Start the heater 8 to make the temperature in the wood processing space reach the set temperature value of 80°C, and monitor the temperature through the temperature sensor 1; open the steam spray pipe 7, so that the oxygen content in the wood processing space reaches the set oxygen value. The content value is 21%, which is monitored by the oxygen content sensor 2. The temperature and oxygen content are controlled by turning on and off the heating and steaming, and the state is maintained for 7.5 hours;

[0022] 4) Then set the temperature to 150°C and the oxygen content to 12% for 5 hours;

[0023] 5) Then set the temperature and oxygen ...

example 2

[0027] 1) Pile the Chinese fir wood 9 with a thickness of 20mm to be processed in the airtight space formed by the equipment housing 4 according to the wood drying method;

[0028] 2) Turn on the equipment circulation fan 5 to circulate the hot air medium in the material pile at a speed of 1.5m / s in the processing equipment space;

[0029] 3) Turn on the heater 8 to make the temperature in the wood treatment space reach the set temperature value of 150° C., and turn on the steam spray pipe 7 to make the oxygen content in the wood treatment space reach the predetermined oxygen content value of 12%, and this state is maintained 1 hour time;

[0030] 4) Then set the temperature to 200°C and the oxygen content to 6% for 1 hour;

[0031] 5) Then set the temperature and oxygen content to 260°C and 2%, respectively, and maintain it for 1 hour;

[0032] 6) Turn off the heater 8 and steam spray pipe 7, open the dehumidification valve 6 to cool down, and when the temperature in the wo...

example 3

[0035] 7) Pile the birch wood 9 with a thickness of 4mm to be processed in the airtight space formed by the equipment housing 4 according to the wood drying method;

[0036] 8) Turn on the equipment circulation fan 5 to circulate the hot air medium in the processing equipment space at a speed of 5m / s in the processing space;

[0037] 9) Turn on the heater 8 to make the temperature in the wood treatment space reach the set temperature value of 120°C, turn on the steam spray pipe 7, and make the oxygen content in the wood treatment space reach the set oxygen content value of 15%, and this state is maintained 0.6 hours;

[0038] 10) Then set the temperature to 180°C, set the oxygen content to 8%, and maintain it for 0.8 hours;

[0039] 11) Then set the temperature and oxygen content to 220°C and 4%, respectively, and maintain it for 0.8 hours;

[0040] 12) Turn off the heater 8 and the spray steam pipe 7, open the dehumidification valve 6 to cool down, and when the temperature ...

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Abstract

The invention provides a thermal processing method of timber and belongs to the technical field of the heat treatment of timber. The specific procedures are: (1) the timber is placed in a heat treatment chamber by yard; (2) the temperature and oxygen content of the first stage are set, namely, the temperature is 80-150 DEG C and the oxygen content is 12-21%, the treatment time maintains 0.5-1.5 hours for each centimeter thickness of the timber; (3) the temperature and oxygen content of the second stage are set, namely, the temperature is 150-200 DEG C and the oxygen content is 6-12%, the treatment time maintains 0.5-2 hours for each centimeter thickness of the timber;(4) the temperature and oxygen content of the third stage are set, namely, the temperature is180-260 DEG C and the oxygen content is 2-6%, the treatment time maintains 1.5-2 hours for each centimeter thickness of the timber; (5) the fourth stage is a cooling and equalization treatment stage, the indoor temperature is lowered to less than 100 DEG C, then equalization treatment on the water ratio of the timber is carried out in the way of spray-steaming, then the temperature is lowered to 40-50 DEG C after the water ratio of timber meets the product requirement, and the treated timber is taken out. The method can prominently reduce the problems of the prior art that the strength loss is serious with a great deal of defects.

Description

technical field [0001] The invention belongs to the technical field of wood heat treatment, that is, a method for achieving the effect of wood heat treatment by controlling the temperature and oxygen content of humid air in a closed space, so as to improve the dimensional stability and anti-corrosion performance of wood during use, thereby expanding the use range of wood . Background technique [0002] Wood is a widely used material in civil construction and decoration. It has the functions of natural environmental protection, heat preservation, and maintaining space humidity balance, and is very popular among people. However, wood is an anisotropic material, and defects such as deformation, cracking, and decay will occur during use, and plantation wood is more prominent. After the wood is subjected to high temperature heat treatment, some properties of the wood will be changed, and its dimensional stability and corrosion resistance can be improved. [0003] For example, a...

Claims

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Application Information

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IPC IPC(8): B27K1/00
Inventor 周永东姜笑梅吕建雄傅峰刘君良
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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