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Near infrared spectrum-based mathematical model and detection method for heat-treated wood color

A technology of near-infrared spectroscopy and mathematical models, applied in the direction of material analysis, measuring devices, and scientific instruments through optical means, can solve problems such as uneven color of heat-treated wood and affect processing quality, so as to increase added value and improve product quality. Effect of adding value and expanding application fields

Inactive Publication Date: 2015-06-24
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of wood heat treatment, the color of heat-treated wood is often changed due to the thermal degradation of wood chemical components, and the color of heat-treated wood is uneven, which affects the processing quality.

Method used

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  • Near infrared spectrum-based mathematical model and detection method for heat-treated wood color
  • Near infrared spectrum-based mathematical model and detection method for heat-treated wood color
  • Near infrared spectrum-based mathematical model and detection method for heat-treated wood color

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Embodiment 1

[0037] This embodiment is a mathematical quantitative model building method for detecting heat-treated wood color, specifically comprising the following steps:

[0038] (1) Sample pretreatment: treat southern pine wood into wood blocks (80 pieces in total) with a fiber direction of 20 mm x a radius direction of 20 mm x a chord direction of 20 mm;

[0039] (2) Heat treatment: Take 20 pieces of wood respectively, and use water vapor as a protective gas in an electric blower drying box, and carry out heat treatment at 120°C×4h, 180°C×4h, 220°C×4h, plus untreated A group of (20) together as the experimental material.

[0040] (3) Measure the colorimetric parameters of the wood block (the data are shown in the column of L*, a*, b* in Table 1);

[0041] Table 1 Colorimetric parameter data of each wood block

[0042]

[0043] (4) Gather near-infrared spectrum: Get step (3) and carry out the wooden piece after the colorimetric parameter measurement, utilize German Bruker to have ...

Embodiment 2

[0053] The difference between embodiment 2 and embodiment 1 is that the preprocessing method of the near-infrared spectral information of the step (5) chord section is different. In embodiment 2, the preprocessing method is: use OPUS software to eliminate the near-infrared spectral data of the chord section The constant bias preprocessing method selects the range of the spectral region, 9-point smoothing, 10 principal components, and uses partial least squares and cross-validation methods.

[0054] The mathematical quantitative model of the obtained chromaticity parameter lightness L* is, the coefficient of determination R 2 =91.97, root mean square error RMSECV=3.35, relative analytical error RPD=3.53.

Embodiment 3

[0056] The difference between embodiment 3 and embodiment 1 is only that the preprocessing method of the near-infrared spectral information of the step (6) chord section is different, and the preprocessing method in embodiment 2 is: utilize OPUS software to carry out a Order derivative and vector normalization preprocessing method, select the range of spectral region, 15-point smoothing, 3 principal component scores, use partial least square method and cross-check method.

[0057] The obtained mathematical quantitative model of a* has coefficient of determination R2=89.38, root mean square error RMSECV=0.692, and relative analysis error RPD=2.46.

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Abstract

The invention relates to near infrared spectrum techniques, in particular to near infrared spectrum-based mathematical model and detection method for heat-treated wood color. A building method of the mathematical model includes the steps of 1, processing wood to obtain a plurality of wood blocks 15mm to 25mm in fiber direction, 18mm to 25mm in radial direction and 18mm to 25mm in tangential direction; 2, heat-treating the processed wood blocks; 3, measuring colorimetric parameters of the wood blocks; 4, acquiring near infrared spectral information of tangential sections of the wood blocks subjected to the measurement of the colorimetric parameters; 5, establishing the mathematical model of colorimetric parameters. The mathematical model is suitable for online detection of the color of the heat-treated wood.

Description

technical field [0001] The invention relates to the technical field of near-infrared spectroscopy, in particular to a mathematical model and detection method of heat-treated wood color based on near-infrared spectroscopy. Background technique [0002] Wood has the advantages of beautiful texture and convenient processing. Due to the deposition of various pigments, resins, tannins and other oxidized substances in wood cells, wood shows different colors. Different woods have different colors, and the same piece of wood has different colors in different parts. In the production of wood products, according to the different needs of consumers, the visual characteristics of wood can be improved through technical means such as wood dyeing to meet people's diverse needs. Wood modification can be divided into chemical and physical methods. The chemical method is to use various wood coloring agents and preservatives to penetrate into the wood to achieve the purpose of changing the c...

Claims

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Application Information

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IPC IPC(8): G01N21/359G01N21/3563
Inventor 张文博仝莉
Owner BEIJING FORESTRY UNIVERSITY
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