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Model construction method for wood softening effect after hydro-thermal-microwave combined softening treatment

A technology of softening treatment and construction method, applied in radiation/wave wood treatment, wood treatment, wood heating and other directions, can solve the problems of different softening conditions and inapplicability, achieve strong equipment versatility, achieve quantitative control, and adapt to tree species wide effect

Active Publication Date: 2018-04-13
SOUTHWEST FORESTRY UNIVERSITY
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Problems solved by technology

However, different tree species have different softening conditions due to the different chemical components and structures of their cell walls. That is, a kind of wood in an experiment corresponds to a specific softening treatment process, and the process conditions of a certain wood softening obtained through the experiment may be It cannot be applied to the softening of other woods

Method used

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  • Model construction method for wood softening effect after hydro-thermal-microwave combined softening treatment
  • Model construction method for wood softening effect after hydro-thermal-microwave combined softening treatment
  • Model construction method for wood softening effect after hydro-thermal-microwave combined softening treatment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Experimental materials and methods:

[0037] A Hydrothermal softening treatment:

[0038] 1) Sample tree species: white wood, artificial forest teak, Chinese toon, natural forest teak, water Qinggang; different densities of wood have white wood ( Aquilaria sinensis ) (air dry density 0.40g / cm 3 ), plantation teak ( Tectona grandis ) (air dry density 0.50g / cm 3 ), Toon ( Toona sinensis ) (air dry density 0.60g / cm 3 ), natural forest teak (air dry density 0.70g / cm 3 ), Shuiqinggang ( Fagus longipetiolata ) (air dry density 0.80g / cm 3 );

[0039] 2) Sample size: the length direction, that is, the axial direction of the wood sample is 30 mm, the width direction, that is, the chord direction of the wood sample is 20 mm, and the thickness direction, that is, the radial direction of the wood sample is 20 mm.

[0040] 3) Wood initial moisture content: 10%

[0041] 4) Absolute pressure: 0.01-0.02MPa

[0042] 5) Treatment temperature: 90~120℃, treatment time 120~24...

Embodiment 2

[0076] A method for building a model of wood softening effect after hydrothermal-microwave joint softening treatment, comprising the following specific steps:

[0077] A. Hydrothermal softening treatment: for different densities x 1 (0.2-1.0 g / cm 3 ) wood undergoes hydrothermal softening treatment, the temperature of the hydrothermal softening treatment is x 2 (70-150°C), water heating time is x 3 (80-200min) to obtain wood softened by hydrothermal treatment; the size of the wood is 30mm in the axial direction, 10mm in the chord direction, and 10mm in the radial direction;

[0078] B, get the wood processed through step A, use 2 layers of polyvinyl chloride film to wrap the wood, and then carry out microwave softening treatment, the power of the microwave softening treatment is x 4 (400-800 W), microwave time is x 5 (1-6min), to obtain the wood after combined softening treatment by hydrothermal-microwave;

[0079] C, model building: carry out transverse compression t...

Embodiment 3

[0087] A method for building a model of wood softening effect after hydrothermal-microwave joint softening treatment, comprising the following specific steps:

[0088] A. Hydrothermal softening treatment: for different densities x 1 (0.2-1.0 g / cm 3 ) wood undergoes hydrothermal softening treatment, the temperature of the hydrothermal softening treatment is x 2 (70-150°C), water heating time is x 3 (80-200min) to obtain wood softened by hydrothermal treatment; the size of the wood is 3mm in the axial direction, 30mm in the chord direction, and 30mm in the radial direction;

[0089] B, get the timber processed through step A, adopt 10 layers of polyvinyl chloride film to wrap the timber, then carry out microwave softening treatment, the power of described microwave softening treatment is x 4 (400-800 W), microwave time is x 5 (1-6min), to obtain the wood after combined softening treatment by hydrothermal-microwave;

[0090] C, model building: carry out transverse compr...

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Abstract

The invention discloses a model construction method for a wood softening effect y (namely: the axial maximum compression ratio y<1> and the transverse maximum compression ratio y<2> after hydro-thermal-microwave combined softening treatment. The method comprises the steps of: performing hydro-thermal softening treatment of woods having different densities x<1> (at different temperatures x<2> and different times x<3>) at first; then, performing microwave softening treatment of the woods (at different powers x<4> and different times x<5>); and finally, constructing a quantitative control mathematical model for the wood softening effect after hydro-thermal-microwave combined softening treatment, so that y<1>=f(x<1>,x<2>,x<3>,x<4>,x<5>) and y<2>=f(x<1>,x<2>,x<3>,x<4>,x<5>) are obtained. By means of the method, quantitative control of the wood softening effect after hydro-thermal-microwave combined softening treatment can be realized; the controllability is good; the accuracy is high; and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of quantitative regulation and control of wood softening effect, and in particular relates to a model construction method for wood softening effect after combined hydrothermal-microwave softening treatment. Background technique [0002] The softening process is very important, whether it is compressing the wood laterally to increase its density or longitudinally compressing it to wrinkle it to increase its lateral bending. For the softening of wood, the current treatment methods mainly include physical methods (such as: boiling, steaming, microwave, high-frequency medium heating treatment) and chemical methods (such as: liquid ammonia, gaseous ammonia, ammonia water, hydrazine, urea and alkali processing, etc.) two types (Song Kuiyan, 2006). Normally, wood is essentially in a glassy state without softening. In order to ensure that the wood is compressed and compacted without major microscopic damage, it is...

Claims

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Application Information

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IPC IPC(8): G06F17/50B27K5/00B27K5/06
CPCB27K5/001B27K5/0055B27K5/06G06F30/20G06F2119/08G06F2119/18
Inventor 杨燕邱坚沈华杰王云龙王宪李有贵
Owner SOUTHWEST FORESTRY UNIVERSITY
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