Online detection method and device for wood moisture content

A detection method and technology for moisture content are applied in the online detection of moisture content in the drying process of wood, and in the field of online detection of moisture content of wood. simple effect

Pending Publication Date: 2021-02-19
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the detection accuracy of this method is greatly affected by the tree species, the depth of the probe inserted into the wood, the position of the probe, and the distance between the probes

Method used

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  • Online detection method and device for wood moisture content
  • Online detection method and device for wood moisture content
  • Online detection method and device for wood moisture content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Preparation of Standard Curve

[0093] The test material was eucalyptus (Eucalyptus exserta) collected from Gaozhou City, Guangdong Province, China. A chord-sawn board with a size of 120 mm (chord direction)×25 mm (radial direction)×900 mm (longitudinal direction) without visible defects was sawn from a eucalyptus log, and the initial moisture content of the test material was 42%.

[0094] Wood samples with a size of 120 mm (chord direction) × 25 mm (radial direction) × 10 mm (longitudinal) were sawn from the above-mentioned chord-cut boards for measuring electrical resistance and moisture content, and then making a standard curve.

[0095] First, the initial weight of the wood sample was obtained, and electrochemical tests were performed on the wood sample. Afterwards, the wood samples were dried at a constant temperature of 60 °C in a DKN611 drying oven (Daiwa Scientific Co., Ltd., Japan) to obtain different moisture contents. Take out the wood samples from the dr...

Embodiment 2

[0128] The sample to be tested in embodiment 1 is replaced, still adopts the eucalyptus (Eucalyptusexserta) of Gaozhou City, Guangdong Province, China, but the sample used for the standard curve is taken from a different tree strain and is different from the eucalyptus in embodiment 1 . Saw-sawn eucalyptus logs have a size of 120 mm (chord direction) x 25 mm (radial direction) x 900 mm (longitudinal) without visible defects, and the initial moisture content of the test material is 45%.

[0129] A sample to be tested with a size of 120 mm (chord direction)×25 mm (radial direction)×10 mm (longitudinal direction) was sawed from the above-mentioned chord-cut board for resistance measurement.

[0130] The electrochemical workstation was used to measure the current and resistance. The parameters of the electrochemical workstation were set as follows: the initial potential was 1V, the sampling interval was 0.1s, the running time was 240s, and the sensitivity was 0.01A / V. Before the ...

Embodiment 3

[0140] Preparation of Standard Curve

[0141] The cork oak wood was collected from the Tanjiahe Ecological Protection Center of Nanwan Forest Farm, a state-owned Xinyang City, Henan Province. The sampling site was 200m above sea level, 113°55′ east longitude, 31°52′ north latitude. The trees are all 60 years old, and the average diameter of the cork oak is 38cm. It is sawed into several plates of 900 mm (length) × 120 mm (width) × 25 mm (thickness), and the initial moisture content of the test material is 50%. Select a chord-cut board with no visible defects and saw it into a wood sample with a size of 120 mm (chord direction) × 25 mm (radial direction) × 10 mm (longitudinal) for the measurement of electrical resistance and moisture content, and then make a standard curve .

[0142] First, the initial weight of the wood sample was obtained, and electrochemical tests were performed on the wood sample. Afterwards, the wood samples were dried at a constant temperature of 60 ...

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Abstract

The invention provides an online detection method and device for the wood moisture content. The online detection method for the wood moisture content comprises the following steps of connecting a to-be-detected sample to a probe of an electrochemical workstation to form a closed loop, measuring the current of the closed loop by using the electrochemical workstation, and obtaining the resistance ofthe to-be-measured sample, based on the resistance of the to-be-detected sample and according to the standard curve that the moisture content changes along with the resistance of the wood sample, acquiring the moisture content of the to-be-detected sample, wherein the density of the to-be-detected sample is approximately the same as that of the wood sample. According to the online detection method for the wood moisture content, online detection of all moisture content stages of the wood in the drying process can be achieved, and the detection precision is high.

Description

technical field [0001] The invention belongs to the technical field of wood processing, and relates to an online detection method and device for moisture content of wood, in particular to an online detection method and device for moisture content in a wood drying process. Background technique [0002] Wood moisture content is one of the most important parameters that needs to be measured quickly and accurately during the drying process, because the control and regulation of drying environmental conditions are largely dependent on wood moisture content. The detection of wood moisture content is of great significance in wood processing and utilization. 75% of the quality problems in wood products are caused by inaccurate control of the moisture content of raw materials used in wood processing. The moisture content of wood seriously affects the physical and mechanical properties and mechanical processing performance of wood. [0003] The fiber saturation point (FSP) is the moi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/04
CPCG01N27/48G01N27/048G01N27/041
Inventor 付宗营周永东任海青
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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