Method of determining physical properties of Eucalyptus cloeziana

A technology for the mechanical properties of Eucalyptus inflorescences, applied in the field of wood properties, can solve the problems that the near-infrared model is difficult to measure the wood properties of large inflorescences, and the near-infrared spectral analysis models are different, so as to achieve accurate and reliable mechanical properties, save manpower and material resources and Financial resources, the effect of improving work efficiency

Inactive Publication Date: 2016-12-21
RES INST OF TROPICAL FORESTRY CHINESE ACAD OF FORESTRY +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no research on the determination of Eucalyptus macroflorescence by using near-infrared spectroscopy analysis technology.
Moreover, due to differences in biological characteristics such as growth and adaptability of tree species, even on the same model of near-infrared scanners, the near-infrared spectral analysis models of different tree species will be different
Therefore, the near-infrared models established by other tree species are difficult to be used for the determination of wood properties of large flower sequences.

Method used

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  • Method of determining physical properties of Eucalyptus cloeziana

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Embodiment 1

[0043] Such as Figure 1-9 As shown, a method for determining the mechanical properties of Eucalyptus macroflorum wood, including building a model as follows:

[0044] (1) Sawdust sample collection: select live Eucalyptus eucalyptus with no defects in the tree age of 9 to 12 years for numbering, and divide them into 93 plants in A part and 17 in B part, and take the peeled wood sawdust at a trunk height of 1.3 meters Samples, take the wood chip samples back to the laboratory to dry;

[0045] (2) Near-infrared spectrum collection of wood chip samples: the wood chip samples in step (1) are pulverized into wood powder through a sample grinder, and the particle size of wood powder is 60 to 80 mesh; in a room with a constant temperature of 24 ° C, the MPA Fourier transform spectrometer of the German Bruker company is used Scan and collect near-infrared spectrum, the spectral band range is 4000~12000cm -1 , the resolution is 8cm -1 ;

[0046] (3) Determination of the standard va...

Embodiment 2

[0057] A method for quickly measuring the flexural elastic modulus, flexural strength and compressive strength along the grain of Eucalyptus grandis wood, comprising the following steps:

[0058] (1) Sampling of sawdust samples. In the 9.5-year-old eucalyptus test forest, select 10 live standing trees without defects, remove the bark of high 5cm and wide 6cm with a knife at the high 1.3m place (diameter at breast height) of the trunk, and use a wide flat drill bit with 1.2cm electric drill for drilling wood chips / sample, the drilling depth does not exceed 4cm, drill 2 to 3 holes, place a water scoop under the drill holes to pick up sawdust, and open a 1 / 3 wide arc at the opening of the scoop to facilitate the scoop close to the tree trunk , and then put the sawdust into a kraft paper envelope and bring it back to the laboratory to air-dry for more than 15 days at 24°C under air conditioner.

[0059] (2) Near-infrared spectrum scanning and collection of wood chip samples. ...

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Abstract

The invention discloses a method of determining physical properties of Eucalyptus cloeziana, comprising the steps of (1), collecting a sawdust sample; (2), subjecting the sawdust sample to near-infrared spectral scanning; (3), standardly determining various physical properties of wood; (4), carrying out spectral pretreatment and establishing and optimizing a model; (5), carrying out model outside inspection and selection; (6), applying the model. The method of determining modulus of elasticity, bending strength and parallel-to-grain compressive strength of Eucalyptus cloeziana according to the invention not only can provide significantly improved operating efficiency and greatly saved manpower, material and financial resources, can also ensure reduced damage to woods and give full play to the advantages of near-infrared rapid analysis, and therefore, quick determination is achieved for property indexes of large batch of wood samples of Eucalyptus cloeziana.

Description

technical field [0001] The invention relates to the field of wood properties, in particular to a method for measuring the mechanical properties of eucalyptus macroinflorescence wood. Background technique [0002] Eucalyptus cloeziana, also known as Eucalyptus cloeziana, is the only species of Eucalyptus in the subgenus Eucalyptus genus Queensland. It grows rapidly, has obvious dominance at the top, straight and round trunk, good natural pruning, hard and durable wood, and straight texture. It has a uniform structure and is suitable for cultivating large-diameter timber. It is an important solid wood species and is widely used in mine pillars, buildings, furniture and sleepers. Its wood flexural modulus, flexural strength, and along-grain compressive strength significantly affect the quality of wood and the management benefits of plantations, and are important economic traits. Among them, the flexural modulus of wood represents the elasticity (stiffness) or stiffness of wood...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563G01N21/359
CPCG01N21/3563G01N21/359
Inventor 翁启杰陈健波李昌荣甘四明李发根李梅周长品
Owner RES INST OF TROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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