CN107908887B - Model construction method for wood softening effect after hydrothermal-microwave combined softening treatment - Google Patents
Model construction method for wood softening effect after hydrothermal-microwave combined softening treatment Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/001—Heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
- B27K5/0055—Radio-waves, e.g. microwaves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/06—Softening or hardening of wood
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/18—Manufacturability analysis or optimisation for manufacturability
Abstract
The invention discloses a wood softening effect after hydrothermal-microwave combined softening treatmenty(i.e., axial maximum compression ratio)y 1 And transverse maximum compression ratioy 2 ) The model construction method of (1). The method comprises the following steps: firstly, for different densitiesx 1 Subjecting the wood to a hydrothermal softening treatment (at different temperatures)x 2 Different timesx 3 Under conditions); secondly, it is subjected to a microwave softening treatment (at different powers)x 4 Different timesx 5 Under conditions); finally, a mathematical model for quantitatively regulating and controlling the softening effect of the wood after hydrothermal-microwave softening combined softening treatment is constructed to obtainy 1 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ），y 2 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ). The method can realize the quantitative regulation and control of the softening effect of the wood after hydrothermal-microwave combined softening treatment, and has the advantages of good controllability, high accuracy and wide application range.
Description
Technical Field
The invention belongs to the technical field of quantitative regulation and control of a wood softening effect, and particularly relates to a model construction method of the wood softening effect after hydrothermal-microwave combined softening treatment.
Background
The softening process is a very important element whether the wood is compressed transversely to increase its density or longitudinally to create corrugations to increase its transverse curvature. For softening wood, the current treatment methods mainly include two physical methods (such as water boiling, steaming, microwave and high-frequency medium heating treatment) and chemical methods (such as liquid ammonia, gaseous ammonia, ammonia water, hydrazine, urea and alkali treatment, etc.) (Song Quezhizi, 2006). Generally, wood is substantially in a glassy state without softening. In order to ensure that the wood is compressed and compacted under the condition of not generating large micro-damage, the wood is generally required to be softened in advance; in contrast, when wood that has not been softened in advance is compressed, the intercellular layers of the cells of the wood are torn by external force to be destroyed, and the strength of the wood is greatly reduced. The reason why the wood can be softened is that the main components of the wood, namely lignin, cellulose and hemicellulose, have glass transition temperatures, and the glass transition temperatures of the three major components are reduced only by giving certain moisture and temperature conditions, so that the purpose of softening is achieved. Studies have confirmed that the triathlon of wood is not degraded as long as the temperature does not exceed 160 ℃ (Guomeing et al, 2010), and the mechanical strength of the wood can still be restored as before after water loss. But different tree species have different softening conditions due to different chemical components and structures of cell walls, namely, one wood in an experiment corresponds to a specific softening treatment process, and the process conditions for softening certain wood obtained through the experiment can not be applicable to softening other wood. In general, the density has a direct effect on the softening effect of the wood. The lower the density of the wood, the less the amount of the cell wall substances of the wood in unit volume (namely, the lower the absolute content of the three major elements in unit volume), and the easier the softening is to be carried out; in contrast, softening does not proceed easily, and higher process conditions (e.g., higher temperature or longer time) are required for softening to achieve better softening effect. If we can build the relationship between the amount (density) of the wood cell wall material, the softening process conditions and the softening effect of the wood, we can solve the problem that one kind of wood in one test only corresponds to one specific softening treatment process. Therefore, the establishment of the relationship between the amount (density) of the wood cell wall substances, the softening process conditions and the wood softening effect (i.e. optimizing a set of softening processes suitable for all wood) is the core problem to be solved by the invention.
Disclosure of Invention
The invention aims to provide a model construction method for a wood softening effect after hydrothermal-microwave combined softening treatment.
The invention is realized by the following specific steps:
A. hydrothermal softening treatment: for different densitiesx 1 The wood is subjected to hydrothermal softening treatment, and the temperature of the hydrothermal softening treatment isx 2 The hydrothermal time isx 3 Obtaining wood subjected to hydrothermal softening treatment;
B. microwave softening treatment: b, the wood treated in the step A is taken, a waterproof film is adopted to wrap the wood, and then microwave softening treatment is carried out, wherein the power of the microwave softening treatment isx 4 The microwave time isx 5 So as to obtain the wood after the hydrothermal-microwave combined softening treatment;
C. constructing a model: respectively carrying out a transverse compression test and an axial compression test on the wood obtained in the step B to obtain the axial maximum compression ratioy 1 And transverse maximum compression ratioy 2 Obtaining a multiple regression equation through regression to obtainy 1 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ），y 2 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ）。
Compared with the prior art, the invention has the beneficial effects that:
1. the regulation and control method can realize the axial maximum compression ratio of the wood after the hydrothermal-microwave combined treatmenty 1 And transverse maximum compression ratioy 2 The quantitative regulation and control method has the advantages of simple flow, good controllability, strong equipment universality, accurate and reliable regulation and control result, wide tree species application range, economic and controllable cost and particular suitability for industrial popularization and application.
2. The invention quantifies different wood densities, different softening process conditions and wood softening effects (axial maximum compression ratio)y 1 And transverse maximum compression ratioy 2 ) The general softening process conditions of axial compression and cross grain compression of the wood are determined, and theoretical guidance is provided for industrial production.
3. The regression equation (model) constructed by the method effectively realizes the quantitative regulation and control of the wood softening effect, and the values of 5 parameters are given arbitrarily in the limited range, so that the value of the axial maximum compression ratio or the value of the transverse maximum compression ratio can be obtained; or conversely, the process conditions can be reversed given an axial maximum compression ratio; thereby realizing the quantitative regulation and control of the softening effect of the wood after the hydrothermal-microwave combined softening treatment.
Drawings
FIG. 1 is a diagram showing a relationship between a model value and an actually measured value of an axial maximum compression ratio in embodiment 1 of the present invention;
fig. 2 is a diagram showing a relationship between a model value and an actual measurement value of the lateral maximum compression ratio in embodiment 1 of the present invention.
Detailed Description
The present invention is further illustrated but not limited in any way by the following description, and any alterations or substitutions based on the teachings of the present invention are intended to fall within the scope of the present invention.
The model construction method of the wood softening effect after hydrothermal-microwave combined softening treatment comprises the following specific steps:
A. hydrothermal softening treatment: for different densitiesx 1 The wood is subjected to hydrothermal softening treatment, and the temperature of the hydrothermal softening treatment isx 2 The hydrothermal time isx 3 Obtaining wood subjected to hydrothermal softening treatment;
B. microwave softening treatment: b, the wood treated in the step A is taken, a waterproof film is adopted to wrap the wood, and then microwave softening treatment is carried out, wherein the power of the microwave softening treatment isx 4 The microwave time isx 5 So as to obtain the wood after the hydrothermal-microwave combined softening treatment;
C. constructing a model: respectively carrying out a transverse compression test and an axial compression test on the wood obtained in the step B to obtain the axial maximum compression ratioy 1 And transverse maximum compression ratioy 2 Obtaining a multiple regression equation through regression to obtainy 1 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ），y 2 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ）。
The density is in the range of 0.2-1.0g/cm3。
The dimension of the wood is 30-200mm in the axial direction, 10-30mm in the chord direction and 10-30mm in the radial direction.
The temperature of the hydrothermal softening treatment in the step A is 70-150 ℃, and the hydrothermal time is 80-200 min; the power of the microwave softening treatment in the step B is 400-800W, and the microwave time is 1-6 min.
The waterproof film is a polyvinyl chloride film with 2-10 layers.
The transverse compression test is tested according to the national standard of the people's republic of China GB1939-91 of transverse grain compression test method of wood, and the axial compression test is tested according to the national standard of the people's republic of China GB1935-91 of longitudinal grain compression strength test method of wood.
Saidy 1 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ) The specific equation of (2) is as follows:
y 1 =α0 –α1 x 1 +α2 x 2 +α3 x 3 +α4 x 4 +α5 x 5 ，
wherein alpha is0 ~α5As a coefficient;
saidy 2 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ，x 6 ) The specific equation of (2) is as follows:
y 2 =β0 –β1 x 1 +β2 x 2 +β3 x 3 +β4 x 4 +β5 x 5 ，
wherein beta is0~β5As a coefficient.
Saidy 1 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ) Andy 2 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ) The specific equation of (2) is as follows:
y 1 =0.6838 - 0.9224·x 1 + 0.0003115· x 2 + 0.0001438·x 3 + 0.0001575·x 4 + 0.01080·x 5 (R 2 = 98.49%.)；
y 2 = 0.7563 - 0.8779· x 1 + 4.205E-05·x 2 + 0.0001473· x 3 + 0.0002102·x 4 + 0.01200·x 5 (R 2 = 98.25%.)。
the model construction method further comprises the following step D of significance test: c, carrying out significance test on the multiple regression equation obtained in the step C, and firstly carrying out axial maximum compression ratioy 1 The fitting effect of the multiple regression equation is evaluated, and 5 factors and constants are ensured to be significant for the regression coefficient of the axial maximum compression ratio; then for maximum compression ratio in the transverse directiony 2 The fitting effect of the multiple regression equation is evaluated, and 5 factors and constants are guaranteed to be significant for the regression coefficient of the transverse maximum compression ratio.
And C, applying the multiple regression equation in quantitative regulation and control of the softening effect of the wood after hydrothermal-microwave combined softening treatment, wherein the application is specifically to take the wood to be softened and givex 1 ，x 2 ，x 3 ，x 4 ，x 5 Substituting the parameter values into the multiple regression equation to obtain the maximum compression ratio of the wood to be softenedy 1 And transverse maximum compression ratioy 2 A model value of (d); or given maximum compressibility of the wood to be softenedy 1 And transverse maximum compression ratioy 2 The model value of the model is used for calculating the technological conditions of hydrothermal-microwave combined softening treatment; thereby realizing the quantitative regulation and control of the wood softening effect.
Example 1
Experimental materials and methods:
a, hydrothermal softening treatment:
1) and (3) sample tree species: radix Aristolochice, artificial forest teak, Toona sinensis, natural forest teak, and cyclobalanopsis glauca; the wood with different densities has aquilaria sinensis (Aquilaria sinensis) (air-dried Density 0.40 g/cm)3) Artificial forest teak (A)Tectona grandis) (air-dried Density 0.50 g/cm)3) Chinese toon, Chinese toon (A) and (B)Toona sinensis) (air-dried Density 0.60 g/cm)3) And natural forest teak (air dry density 0.70 g/cm)3) (iii) cyclobalanopsis glaucaFagus longipetiolata) (air-dried Density 0.80 g/cm)3）；
2) Sample size: the longitudinal direction, i.e., the axial direction of the wood sample, was 30mm, the width direction, i.e., the chord direction of the wood sample, was 20mm, and the thickness direction, i.e., the radial direction of the wood sample, was 20 mm.
3) Initial water content of wood: 10 percent of
4) Absolute pressure: 0.01-0.02MPa
5) Treatment temperature: the treatment time is 120-240 min at 90-120 ℃.
6) A processing device: temperature controllable water bath and pressure cooker.
TABLE 1 hydrothermal-microwave combination treatment Process conditions (Quadrature test)
Tab1. Hydro-thermal treatment processes
B, microwave softening treatment: on the basis of A
1) And (3) sample tree species: same as above
2) Sample size: same as above
3) Initial water content of wood: water content after A
4) Absolute pressure: 0.01MPa
5) Processing power: 400-600W, and the treatment time is 4-6 min
6) A processing device: a microwave oven.
C, determination of softening effect after hydrothermal-microwave combined softening treatment:
1) and (3) sample tree species: samples after A and B treatment
2) Sample size: same as above
3) Initial water content of wood: water content after B
4) The transverse compression test is tested according to the national standard of the people's republic of China GB1939-91 of transverse grain compression test method of wood, and the axial compression test is tested according to the national standard of the people's republic of China GB1935-91 of longitudinal grain compression strength test method of wood.
The experimental results are as follows:
by maximum axial compression of woody 1 And transverse maximum compression ratioy 2 From different densitiesx 1 Different temperature ofx 2 Different timesx 3 Different powerx 4 Different timesx 5 To obtain the maximum axial compression ratio of the woody 1 And transverse maximum compression ratioy 2 Respectively relating to different densitiesx 1 Different temperature ofx 2 Different timesx 3 Different powerx 4 Different timesx 5 To achieve quantitative regulation of the softening effect of the wood after hydrothermal-microwave combined softening treatment.
Table 3 is an evaluation of the fitting effect of the multiple regression equation for the axial maximum compression ratio and the lateral maximum compression ratio in table 2. As can be seen from table 3: maximum axial compressibility of woody 1 And transverse maximum compression ratioy 2 Respectively relating to different densitiesx 1 Different temperature ofx 2 Different timesx 3 Different powerx 4 Different timesx 5 The multiple regression equation of (2) has significant regression coefficient of each parameter. Therefore, the above multiple regression equation can predict the softening effect of different woods well.
Table 4 shows a mutual univariate regression equation of the test values and the model values of the axial maximum compression ratio and the lateral maximum compression ratio, and shows that there is a very significant linear regression relationship between the model values and the test values in terms of the determination coefficients of the regression equation.
Before the regression model is constructed: only one evaluation of the softening effect of the wood sample can be obtained in one test.
After the regression model is constructed: the softening effect of any wood given its density can be evaluated and predicted numerically without extensive experimental work.
The experimental results show that the method can accurately design and control the softening effect of the wood under the hydrothermal-microwave combined softening condition under the condition of carrying out a large number of experiments, and the fitting degree of the model value and the experimental value is high, accurate and reliable.
TABLE 2 multiple regression equations of axial and transverse maximum compression ratios of wood with respect to different densities, different temperatures, different times, different powers, and different times, respectively
Tab.2 Regression equations of three major composition differences as function of temperature and time
TABLE 3 evaluation of the Effect of fitting the multiple regression equation for axial and lateral maximum compressibility
Tab.3 Fitting effect evaluation of regression equations of the axial maximum compression ratio and transverse maximum compression ratio
TABLE 4 mutual univariate regression equation of test values and model values for axial maximum compressibility and lateral maximum compressibility
Tab.4 Regression equations between experimental and model values of the axial maximum compression ratio and transverse maximum compression ratio
Example 2
A model construction method for a wood softening effect after hydrothermal-microwave combined softening treatment comprises the following specific steps:
A. hydrothermal softening treatment: for different densitiesx 1 （0.2-1.0 g/cm3) The wood is subjected to hydrothermal softening treatment, and the temperature of the hydrothermal softening treatment isx 2 (70-150 ℃) and the hydrothermal time isx 3 (80-200 min) to obtain wood subjected to hydrothermal softening treatment; the size of the wood is 30mm in the axial direction, 10mm in the chord direction and 10mm in the radial direction;
B. taking the wood treated in the step A, wrapping the wood by adopting 2 layers of polyvinyl chloride films, and then performing microwave softening treatment, wherein the power of the microwave softening treatment isx 4 (400- & lt800W.), the microwave time isx 5 (1-6 min) to obtain the wood subjected to hydrothermal-microwave combined softening treatment;
C. constructing a model: respectively carrying out a transverse compression test and an axial compression test on the wood obtained in the step B, wherein the transverse compression test is tested according to the national standard of the people's republic of China, namely the transverse grain compression test method for wood GB1939-91, and the axial compression test is tested according to the national standard of the people's republic of China, namely the linear compression strength test method for wood GB1935-91, so as to obtain the axial maximum compression ratioy 1 And transverse maximum compression ratioy 2 Obtaining a multiple regression equation through regression to obtain:
y 1 =α0 –α1 x 1 +α2 x 2 +α3 x 3 +α4 x 4 +α5 x 5 ，
wherein alpha is0 ~α5As a coefficient;
y 2 =β0 –β1 x 1 +β2 x 2 +β3 x 3 +β4 x 4 +β5 x 5 ，
wherein beta is0~β5As a coefficient;
D. and (3) significance test: to axial maximum compression ratioy 1 The fitting effect of the multiple regression equation is evaluated, and the results show that 5 factors and constants have obvious regression coefficients for the axial maximum compression ratio; for maximum compression ratio in the transverse directiony 2 The fitting effect of the multiple regression equation is evaluated, and the results show that 5 factors and constants have obvious regression coefficients for the transverse maximum compression ratio;
E. quantitative regulation and control: taking the wood to be softened, settingx 1 ，x 2 ，x 3 ，x 4 ，x 5 Substituting the parameter value into the regression equation to obtain the maximum compression ratio of the wood to be softenedy 1 And transverse maximum compression ratioy 2 A model value of (d); or given maximum compressibility of the wood to be softenedy 1 And transverse maximum compression ratioy 2 And calculating the technological conditions of hydrothermal-microwave combined softening treatment.
Example 3
A model construction method for a wood softening effect after hydrothermal-microwave combined softening treatment comprises the following specific steps:
A. hydrothermal softening treatment: for different densitiesx 1 （0.2-1.0 g/cm3) The wood is subjected to hydrothermal softening treatment, and the temperature of the hydrothermal softening treatment isx 2 (70-150 ℃) and the hydrothermal time isx 3 (80-200 min) to obtain wood subjected to 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;
B. taking the wood treated in the step A, wrapping the wood by 10 layers of polyvinyl chloride films, and then performing microwave softening treatment, wherein the power of the microwave softening treatment isx 4 (400- & lt800W.), the microwave time isx 5 (1-6 min) to obtain the wood subjected to hydrothermal-microwave combined softening treatment;
C. constructing a model: respectively carrying out a transverse compression test and an axial compression test on the wood obtained in the step B, wherein the transverse compression test is tested according to the national standard of the people's republic of China, namely the transverse grain compression test method for wood GB1939-91, and the axial compression test is tested according to the national standard of the people's republic of China, namely the linear compression strength test method for wood GB1935-91, so as to obtain the axial maximum compression ratioy 1 And transverse maximum compression ratioy 2 Obtaining a multiple regression equation through regression to obtain:
y 1 =α0 –α1 x 1 +α2 x 2 +α3 x 3 +α4 x 4 +α5 x 5 ，
wherein alpha is0 ~α5As a coefficient;
y 2 =β0 –β1 x 1 +β2 x 2 +β3 x 3 +β4 x 4 +β5 x 5 ，
wherein beta is0~β5As a coefficient;
D. and (3) significance test: to axial maximum compression ratioy 1 The fitting effect of the multiple regression equation is evaluated, and the results show that 5 factors and constants have obvious regression coefficients for the axial maximum compression ratio; for maximum compression ratio in the transverse directiony 2 The fitting effect of the multiple regression equation is evaluated, and the results show that 5 factors and constants have obvious regression coefficients for the transverse maximum compression ratio;
E. quantitative regulation and control: taking the wood to be softened, settingx 1 ，x 2 ，x 3 ，x 4 ，x 5 Substituting the parameter value into the regression equation to obtain the maximum compression ratio of the wood to be softenedy 1 And transverse maximum compression ratioy 2 A model value of (d); or given maximum compressibility of the wood to be softenedy 1 And transverse maximum compression ratioy 2 And calculating the technological conditions of hydrothermal-microwave combined softening treatment.
Claims (6)
1. A model construction method for a wood softening effect after hydrothermal-microwave combined softening treatment is characterized by comprising the following specific steps:
A. hydrothermal softening treatment: for different densitiesx 1 The wood is subjected to hydrothermal softening treatment, and the temperature of the hydrothermal softening treatment isx 2 The hydrothermal time isx 3 Obtaining wood subjected to hydrothermal softening treatment; density ofx 1 In the range of 0.2 to 1.0g/cm3Temperature of hydrothermal softening treatmentx 2 The temperature is 70-150 ℃ and the hydrothermal time isx 3 Is 80-200 min;
B. microwave softening treatment: b, the wood treated in the step A is taken, a waterproof film is adopted to wrap the wood, and then microwave softening treatment is carried out, wherein the power of the microwave softening treatment isx 4 The microwave time isx 5 So as to obtain the wood after the hydrothermal-microwave combined softening treatment; power of microwave softening treatmentx 4 At 400-x 5 Is 1-6 min;
C. constructing a model: respectively carrying out a transverse compression test and an axial compression test on the wood obtained in the step B to obtain the axial maximum compression ratioy 1 And transverse maximum compression ratioy 2 Obtaining a multiple regression equation through regression to obtainy 1 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ），y 2 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ）；The above-mentionedy 1 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ) The specific equation of (2) is as follows:
y 1 =α0 –α1 x 1 +α2 x 2 +α3 x 3 +α4 x 4 +α5 x 5 in which α is0 ~α5As a coefficient, obtainingy 1 The final equation is:
y 1 =0.6838 - 0.9224·x 1 + 0.0003115· x 2 + 0.0001438·x 3 + 0.0001575·x 4 + 0.01080·x 5 ；
the above-mentionedy 2 =f（x 1 ，x 2 ，x 3 ，x 4 ，x 5 ，x 6 ) The specific equation of (2) is as follows:
y 2 =β0 –β1 x 1 +β2 x 2 +β3 x 3 +β4 x 4 +β5 x 5 wherein beta is0~β5As a coefficient, obtainingy 2 The final equation is:
y 2 = 0.7563 - 0.8779· x 1 + 4.205E-05·x 2 + 0.0001473· x 3 + 0.0002102·x 4 + 0.01200·x 5 。
2. a model building method according to claim 1, characterized in that the dimensions of said wood are axial 30-200mm, chord 10-30mm, radial 10-30 mm.
3. The model construction method according to claim 1, wherein the waterproof film is a polyvinyl chloride film having 2 to 10 layers.
4. The model construction method according to claim 1, characterized in that the transverse compression test is tested according to the national standard of the people's republic of China "test method for transverse grain compression of wood" GB1939-91, and the axial compression test is tested according to the national standard of the people's republic of China "test method for sequential grain compression of wood" GB 1935-91.
5. The model construction method according to claim 1, characterized in that the model construction method further comprises a step D of significance testing: c, carrying out significance test on the multiple regression equation obtained in the step C, and firstly carrying out axial maximum compression ratioy 1 The fitting effect of the multiple regression equation is evaluated, and 5 factors and constants are ensured to be significant for the regression coefficient of the axial maximum compression ratio; then for maximum compression ratio in the transverse directiony 2 Fitting of multiple regression equationsAnd evaluating the effect, and ensuring that the regression coefficients of the 5 factors and constants to the transverse maximum compression ratio are all obvious.
6. Application of the model construction method according to claim 1 in quantitative regulation and control of wood softening effect after hydrothermal-microwave combined softening treatment, wherein the application is specifically to taking wood to be softened and givingx 1 ，x 2 ，x 3 ，x 4 ，x 5 Substituting the parameter values into the multiple regression equation to obtain the maximum compression ratio of the wood to be softenedy 1 And transverse maximum compression ratioy 2 A model value of (d); or given maximum compressibility of the wood to be softenedy 1 And transverse maximum compression ratioy 2 The model value of the model is used for calculating the technological conditions of hydrothermal-microwave combined softening treatment; thereby realizing the quantitative regulation and control of the wood softening effect.
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| CN109711014B (en) * | 2018-12-14 | 2023-04-07 | 西南林业大学 | Model construction method for bending deflection of wood after hydrothermal-microwave combined softening treatment |
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| CN111941571B (en) * | 2020-08-14 | 2022-01-25 | 潍坊恒远新材料科技有限公司 | Thermal treatment method for thick wood plate |
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