Wood gas permeability analysis and testing method

A technique for gas permeability, analytical testing, applied in permeability/surface area analysis, suspension and porous material analysis, analytical materials, etc.

Pending Publication Date: 2018-06-19
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 permeability steady-state test method with adjustable driving pressure, while ensuring the airtightness of the experimental process

Method used

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  • Wood gas permeability analysis and testing method

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 provides a wood gas permeability analysis and testing method and relates to the field of wood physical property testing. Positive-pressure gas is used as a driving source, and a decompression valve and a pressure regulation valve are arranged between a pressurizing air source and a wood test sample to be detected; driving pressure on a test sample up-flow high-pressure end is controlled. A wood test sample clamping device ensures the air tightness of a penetration testing process, and testing air flow completely passes through a section of the wood test sample; an air flow inlethigh-pressure end of the clamping device is fixed and a slidable member is arranged at an air flow outlet of a low-pressure end. A high-pressure end pressure meter is arranged at the high-pressure endof the wood test sample clamping device; when the permeability is determined, upstream pressure of the wood is displayed; the low-pressure end is communicated with atmosphere; two ends of the wood test sample to be detected have stable positive pressure difference so that the air flow flowing through the wood test sample flows stably. The flow of flowing-out gas is determined at the low-pressureend and a wood gas permeability measurement result is obtained according to a gas permeability calculation equation; the testing method is a stable-state positive-pressure-difference gas permeabilitytesting method and a 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 method. 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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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 高鑫周永东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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