Analyzing and testing device for gas permeability of wood

A gas permeability, analysis and testing technology, applied in the field of wood gas permeability analysis and testing devices

Pending Publication Date: 2018-06-22
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

[0015] The present invention mainly aims at the deficiencies of existing wood permeability test methods, and invents a wood gas p

Method used

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  • Analyzing and testing device for gas permeability of wood
  • Analyzing and testing device for gas permeability of wood
  • Analyzing and testing device for gas permeability of wood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Longitudinal gas permeability measurement of conventional kiln-dried sawn timber of radiata pine: Use a coring drill to drill a 25mm-diameter wood longitudinal cylinder sample, use a vernier caliper to measure the appearance size of the wood sample before the test, the sample length L is 42.00mm, and the sample diameter 25.00mm, so the cross-sectional area A of the sample is 491mm 2 ;

[0054] Remove the low-pressure end plug of the wood sample holder, take out the fixed sample rubber sleeve in the sample chamber, place the wood sample to be tested in it, and then put the rubber cylinder containing the wood sample into the sample chamber. The ends are respectively connected to the high-pressure end plug and the low-pressure end plug, and the adjusting screw is turned to make the high-pressure end plug, the wood sample to be tested, and the low-pressure end plug contact;

[0055] Turn on the gas source switch (gas supplied by a nitrogen cylinder), supply gas to the wood...

Embodiment 2

[0060] Measurement of gas permeability in the chord direction of conventional kiln-dried sawn timber of radiata pine: use a coring drill to drill a wood longitudinal cylinder sample with a diameter of 25 mm, and use a vernier caliper to measure the appearance size of the wood sample before the test. The diameter is 25.00mm, so the cross-sectional area A of the sample is 491mm 2 ;

[0061] Remove the low-pressure end plug of the wood sample holder, take out the fixed sample rubber sleeve in the sample room, place the wood sample to be tested in it, and then put the rubber tube containing the wood sample into the sample room. The ends are respectively connected to the high-pressure end plug and the low-pressure end plug, and the adjusting screw is turned to make the high-pressure end plug, the wood sample to be tested, and the low-pressure end plug contact;

[0062] Turn on the gas source switch (gas supplied by a nitrogen cylinder), supply gas to the wood permeability tester, ...

Embodiment 3

[0067] Longitudinal gas permeability measurement of conventional kiln-dried sawn timber of Chinese fir: Use a coring drill to drill a 25mm diameter wood longitudinal cylinder sample, use a vernier caliper to measure the appearance size of the wood sample before the test, the sample length L is 20.70mm, and the sample diameter is 24.70 mm, so the sample cross-sectional area A is 479mm 2 ;

[0068] Remove the low-pressure end plug of the wood sample holder, take out the fixed sample rubber sleeve in the sample room, place the wood sample to be tested in it, and then put the rubber tube containing the wood sample into the sample room. The ends are respectively connected to the high-pressure end plug and the low-pressure end plug, and the adjusting screw is turned to make the high-pressure end plug, the wood sample to be tested, and the low-pressure end plug contact;

[0069] Turn on the gas source switch (gas supplied by a nitrogen cylinder), supply gas to the wood permeability ...

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Abstract

The invention discloses an analyzing and testing device for the gas permeability of wood, and relates to the field of physical property testing of wood. Positive pressure gas is taken as a driving source, and a pressure reducing valve and a pressure regulating valve are arranged between a pressurized gas source and a wood sample to be detected, so as to control driving pressure at a high pressureend at the upstream of the sample. A wood sample clamping device guarantees the gas tightness during permeation testing, ensures that tested gas flow completely passes a fracture surface of the wood sample, the gas flow inlet high pressure end of the clamping device is fixed, and a gas flow outlet in a low pressure end can serve as a sliding component. A high pressure end pressure gage is mountedat the high pressure end of the wood sample clamping device, and displays the pressure at the upstream of wood during permeability testing, the low pressure end is communicated with the atmosphere, and stable positive pressure difference is formed between the two ends of the wood sample to be detected, so that gas flow flowing through the wood sample flows under a stable state. The low pressure end measures the flow of eluting gas, and a wood gas permeability measured result is obtained according to a gas permeability calculation equation. The device belongs to a stable state positive pressuredifference wood gas permeability testing device, and the testing process is simple and convenient.

Description

technical field [0001] The invention belongs to the field of wood physical performance testing, and in particular relates to a wood gas permeability analysis and testing device. Background technique [0002] Wood permeability is one of the important physical properties of wood. Many aspects of wood science research and processing are closely related to it, especially in the research of wood drying, wood impregnation enhancement, anti-corrosion treatment, flame-retardant treatment, and pulp and paper making process. Wood permeability has been considered as an important parameter [1] . Due to the variety of wood species and their anisotropic characteristics, the measurement and analysis of permeability is the long-term focus of wood physics research. [2-3] . With the adjustment of my country's timber resource structure, especially as the country completely stopped the commercial logging of natural forests nationwide at the end of 2016, the proportion of artificial fast-grow...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 周永东高鑫周凡付宗营江京辉侯俊峰翁翔
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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