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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  • Abstract
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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 correspo

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] Experimental materials and methods:

[0037] A Water thermal softening treatment:

[0038] 1) Specimen tree species: white wood incense, plantation teak, toon, natural forest teak, cypress; woods of different densities have white wood incense ( 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 is 30mm in the axial direction of the wood sample, the width direction is 20mm in the chord direction of the wood sample, and the thickness direction is 20mm in the radial direction of the wood sample.

[0040] 3) Initial moisture content of wood: 10%

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

[0042] 5) Treatment temperature: 90~120℃, treatment time 120~240min.

[0043] 6) Processin...

Example Embodiment

[0075] Example 2

[0076] A method for constructing a model of wood softening effect after hydrothermal-microwave combined softening treatment includes the following specific steps:

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

[0078] B. Take the wood processed in step A, wrap the wood with 2 layers of polyvinyl chloride film, and then perform microwave softening treatment, the power of the microwave softening treatment is x 4 (400-800 W), the microwave time is x 5 (1-6min), to obtain the wood after hydrothermal-microwave combined softening treatment;

[0079] C. Model construction: The wood ...

Example Embodiment

[0086] Example 3

[0087] A method for constructing a model of wood softening effect after hydrothermal-microwave combined softening treatment includes the following specific steps:

[0088] A. Hydrothermal softening treatment: for different densities x 1 (0.2-1.0 g / cm 3 ) Is subjected to hydrothermal softening treatment, and the temperature of the hydrothermal softening treatment is x 2 (70-150℃), water heating time is x 3 (80-200min) to obtain wood that has undergone hydrothermal softening 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. Take the wood processed in step A, wrap the wood with 10 layers of polyvinyl chloride film, and then perform microwave softening treatment, the power of the microwave softening treatment is x 4 (400-800 W), the microwave time is x 5 (1-6min), to obtain the wood after hydrothermal-microwave combined softening treatment;

[0090] C. Model construction: The wood obta...

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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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