A method for inhibiting dry shrinkage of wood

A wood drying and wood technology, applied in the direction of drying solid materials, drying solid materials without heating, drying, etc., can solve the problems of not effectively suppressing serious shrinkage, restricting the utilization of high added value, etc., to meet the needs of rapid Production, reduce equipment investment, avoid shrinkage effect

Active Publication Date: 2017-06-16
西安得一教育科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing technologies including microwave, steam, pre-freezing pretreatment and conventional segmented drying and post-treatment can only slightly slow down or partially restore shrinkage, but cannot effectively suppress severe shrinkage during the drying process, and further Severely limit the efficient and high value-added utilization of eucalyptus, poplar and other wood

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method for suppressing dry shrinkage of wood: comprises the following steps:

[0018] 1) For wood stacking, choose wood that is prone to shrinkage, process it into a certain thickness of board, stack it according to the conventional drying method and put it into a centrifugal drying tank, and fix it with a clamp, and close the tank door;

[0019] 2) Decompression and vacuuming: vacuumize the centrifugal drying tank at room temperature, the absolute pressure in the tank reaches and remains at 3.3kPa, and the wood is placed in the tank for 0.5h;

[0020] 3) Centrifugal dehydration: Keep the vacuum centrifuge tank at room temperature, adjust the speed of the centrifuge according to the different moisture content ranges of wood, when the water content is 60%, the centrifugal speed is 2000r / min; when the water content is 60~50%, the centrifugal speed is 3000r / min; when the water content is 50~40%, the centrifugal speed is 5000r / min; when the water content is 40~30%, the ...

Embodiment 2

[0025] The method for suppressing dry shrinkage of wood: comprises the following steps:

[0026] 1) For wood stacking, choose wood that is prone to shrinkage, process it into a certain thickness of board, stack it according to the conventional drying method and put it into a centrifugal drying tank, and fix it with a clamp, and close the tank door;

[0027] 2) Decompression and vacuuming: vacuumize the centrifugal drying tank at room temperature, the absolute pressure in the tank reaches and remains at 6.7kPa, and the wood is placed in the tank for 1 hour;

[0028] 3) Centrifugal dehydration: keep the vacuum centrifuge tank at room temperature, adjust the speed of the centrifuge according to the different moisture content ranges of wood, the general trend is high moisture content range, low centrifugal speed, low moisture content range (above fiber saturation point), centrifugal speed high. The details are as follows: when the water content is 60%, the centrifugal speed is 20...

Embodiment 3

[0033] The method for suppressing dry shrinkage of wood: comprises the following steps:

[0034] 1) For wood stacking, choose wood that is prone to shrinkage, process it into a certain thickness of board, stack it according to the conventional drying method and put it into a centrifugal drying tank, and fix it with a clamp, and close the tank door;

[0035] 2) Decompression and vacuuming: vacuumize the centrifugal drying tank at room temperature, the absolute pressure in the tank reaches and remains at 4.3kPa, and the wood is placed in the tank for 0.8h;

[0036] 3) Centrifugal dehydration: keep the vacuum centrifuge tank at room temperature, adjust the speed of the centrifuge according to the different moisture content ranges of wood, the general trend is high moisture content range, low centrifugal speed, low moisture content range (above fiber saturation point), centrifugal speed high. The details are as follows: when the water content is 60%, the centrifugal speed is 2000...

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Abstract

The present invention is a method for inhibiting drying and shrinkage of wood, comprising the following steps: 1) wood stacking; 2) decompression and vacuuming; 3) centrifugal dehydration; 4) vacuum drying; The drying tank is restored to normal pressure, and then the wood is unloaded from the drying tank. Advantages of the present invention: (1) After vacuum dehydration at room temperature and high speed, all free water in wood is quickly removed, and this process simultaneously completes wood dehydration and effectively avoids wood shrinkage caused by free water; ( 2) The integration of centrifugal dehydration and vacuum drying, under vacuum conditions, under the critical temperature of shrinkage, and in the range of high moisture content of wood, high-speed centrifugal dehydration of wood to the fiber saturation point, effectively inhibiting the dehydration caused by the removal of free water Drying and shrinking; the combination of centrifugal dehydration and vacuum drying reduces a large amount of equipment investment, saves costs, and meets the requirements of rapid production of shrinkable wood.

Description

technical field [0001] The invention relates to a method for accelerating wood drying and inhibiting wood drying and shrinkage under vacuum conditions, that is, by performing high-speed centrifugal pretreatment on wood to effectively avoid the shrinkage defects of wood in the process of dehydration and drying, which belongs to wood drying field. Background technique [0002] Due to my country's economic development, improvement of living standards, enhancement of aesthetic concepts and health awareness, more and more home styles tend to be more natural, green and environment-friendly, so solid wood furniture, solid wood floors and solid wood interior decoration have become preferred. However, my country's natural high-quality wood resources are in short supply. According to the state of forest resources in my country and the world, the raw materials of my country's wood products industry will be mainly planted forest fast-growing materials for a considerable period of time i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B5/04F26B5/08
Inventor 杨琳刘洪海吴智慧
Owner 西安得一教育科技有限公司
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