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Wood drying method

A wood drying and wood technology, applied in the direction of humidity control wood, drying solid materials, wood processing equipment, etc., can solve the problems of unavoidable bending deformation and diameter cracking, unsuitable for small diameter logs, etc., to avoid drying defects and shorten drying time , to avoid the effect of wood damage

Inactive Publication Date: 2008-08-06
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this device is not suitable for small-diameter logs. When using it to dry small-diameter logs, the problems of bending deformation and radial cracking cannot be avoided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Adopt diameter scope at 6-16cm poplar small-diameter wood, it is sawed into wood section, makes the length of each wood section and its average diameter value ratio be 10, and the moisture content of wood section is 60-80%, adopts the present invention Wood vacuum drying equipment to dry it.

[0066] During the drying process, the control of the drying process is based on the poplar small-diameter wood drying standards listed in Table 1 below:

[0067] Table 1

[0068] Wood moisture content stage (%)

temperature(℃)

Equilibrium moisture content of drying medium

(%)

＞40

40

14

[0069] 40～30

30～20

20～10

＜10

50

60

70

80

12

10

6

4

[0070] The specific steps are as follows:

[0071] Wood sections are piled up vertically and horizontally one by one on the bottom plate of the loading vehicle 22, and each layer is separated by a drilling spacer ...

Embodiment 2

[0078] Adopt thickness 20cm poplar plank, it is sawed into 100cm long wood section, makes the length of each wood section and its thickness ratio be 5, and the moisture content of wood section is 90-100%, adopts wood vacuum drying equipment of the present invention to It is dried.

[0079] During the drying process, the control of the drying process is based on the poplar small-diameter wood drying standards listed in Table 2 below:

[0080] Table 2

[0081] Wood moisture content stage (%)

temperature(°C)

Equilibrium moisture content of drying medium (%)

＞50

50～35

35～25

25～15

＜15

50

55

60

70

85

12

10

8

6

4

[0082] The specific steps are as follows:

[0083] Wood sections are piled up vertically and horizontally one by one on the bottom plate of the loading vehicle 22, and each layer is separated by a drilling spacer 25, and then the loading vehicle 22 that is placed on t...

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Abstract

The invention discloses a method of log vacuum drying, which is adaptable to drying process of logs with minor diameter. The method comprises carrying out reheating to-be-dried wood, then keeping the reheating to-be-dried wood under vacuum circumstance, enabling drying media to flow along the longitudinal direction of the to-be-heated wood, controlling the temperature and value of absolute pressure according to corresponding graphs of previously determined medium temperature, the absolute pressure and equilibrium moisture content, charging cooling water in a heat exchange system when the final moisture content of the wood meeting the qualification and thereby realizing rapidly cooling and discharging, wherein the to-be-dried wood is log with minor diameter or plates and the ratio of the length of the to-be-dried wood and the average diameter or thickness is 5-15. The method of the invention enables the wood to be uniformly heated, and obviously shortens the time for the procedures of preheating the wood and drying, thereby largely increasing the production efficiency of drying the wood.

Description

technical field [0001] The patent of the present invention relates to a wood drying method, in particular to a wood vacuum drying method. Background technique [0002] According to the state of resources in our country, for a long period of time in the future, the raw materials for the development of my country's forest industry products will be mainly fast-growing small-diameter timber with a short rotation period of 5 to 10 years. The development and application in the field of solid wood furniture and decoration will be an effective way to refine and deep-process small-diameter timber and improve the comprehensive utilization rate and added value of small-diameter timber. [0003] Due to the improvement of housing and living conditions, people's demand for furniture is increasing. At the same time, due to the enhancement of environmental protection awareness and yearning for nature, more and more people hope that their living space can be closer to nature. Solid wood furn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B7/00B27K1/00F26B5/04
Inventor 周永东伊松林
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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