CN105437342B - A kind of timber heat modification method based on normal pressure intensification negative pressure heat preservation technique - Google Patents
A kind of timber heat modification method based on normal pressure intensification negative pressure heat preservation technique Download PDFInfo
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- CN105437342B CN105437342B CN201610002660.2A CN201610002660A CN105437342B CN 105437342 B CN105437342 B CN 105437342B CN 201610002660 A CN201610002660 A CN 201610002660A CN 105437342 B CN105437342 B CN 105437342B
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- 238000004321 preservation Methods 0.000 title claims abstract description 22
- 238000002715 modification method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 72
- 238000012545 processing Methods 0.000 claims abstract description 44
- 230000008569 process Effects 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 239000002023 wood Substances 0.000 claims abstract description 29
- 230000002829 reductive effect Effects 0.000 claims abstract description 12
- 230000014759 maintenance of location Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 229920002488 Hemicellulose Polymers 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000351396 Picea asperata Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 241000168036 Populus alba Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000010875 treated wood Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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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
-
- 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
- B27K5/007—Treating of wood not provided for in groups B27K1/00, B27K3/00 using pressure
- B27K5/0075—Vacuum
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The present invention provide a kind of without the need for heating or protection medium, quickly can heat, energy consumption is low, facilities and equipments are simple, the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique without potential safety hazard, it comprises the steps：Timber sawn timber is placed in process kiln 115 125 °C are heated in atmospheric air environment, keep 50 70min, preheated and reduced the moisture content of timber to timber；Then Wood temperature is risen to 150 °C 190 °C with 8 12 °C/h heating rates；Then vacuumize to processing kiln, reduce kiln inner pressure to 0.2～0.3atm, and keeping temperature is constant, temperature retention time is in 1～3h；Finally stop heating, be gradually lowered the temperature for processing kiln, and air be passed through to processing in kiln, pressure is gradually restored to normal pressure level.
Description
Technical field
The present invention relates to a kind of novel timber method of modifying, to adjust appearance color and the dimensional stability of timber, belongs to
Wooden modifying field.
Background technology
Timber heat modification is also referred to as heat_treated wood, is to carry out at heating timber in 200 °C or so of inert environments
A kind of method of reason.Under this temperature levels, there is Partial digestion in the hemicellulose in timber, and the degree of crystallinity of cellulose increases
Plus, the chemical constituent of lignin is also recombinated, and reduces moisture and hydrophilic radical in timber, and chromophoric group changes, with
Its wood color is adjusted, increases its dimensional stability.
The thermally-denatured laboratory of timber is explored and originates from the thirties in last century, and Industry Promotion then starts from last century 90 years
Generation.By the stress level classification for processing medium, mainly there are normal pressure type, negative-pressure type, four kinds of techniques of compression type and mixed type at present.
With water vapour, nitrogen or deep fat are heating medium to normal pressure type technique, exclude while heating to timber or
The oxygen content in processing environment is reduced, over oxidation occurs at high temperature to prevent timber, also reduce the fire in processing procedure
Risk.The Thermowood techniques of Finland are typical normal pressure Technologies for Heating Processing（Referring to Fig. 1）.The technique is mainly with Northern Europe pine
Wood, dragon spruce, birch and white poplar are process object, are made up of 3 stages, and timber is carried out under conditions of being up to 130 °C first
Dry（Stage 1）, drying time is adjusted according to the first moisture content of timber.In ensuing heat treatment stages（Stage 2）, wood
Material is heated at a temperature of 185～215 °C, specifically depends on timber kind and product purpose from temperature.At this
The chemical constituent of individual stage wood cell wall occurs degraded and restructuring causes the change of wood performance.Heat treatment stages when a length of
2～3h, enters cooling and damping stage afterwards（Stage 3）, kiln temperature reduced by atomized water spraying, and timber is in the process
Also absorb certain moisture, most at last moisture control 4～7%.The main deficiency of atmospheric processes is that the preparation for heating medium increases
The cost for processing is added, while needing to carry out corresponding waste water, waste oil is recycled.
Pressing technology adopts steam or water for processing medium, and its closed high humidity environment is may advantageously facilitate half in timber
The hydrolysis of cellulose, can realize preferable modified effect under relatively low temperature levels；But due to wood hydrolysate inclined
Acidity, thus the high humidity environment of acidity also exacerbates the erosion to processing meanss, the raising of stress level is also meant in operation
During need to consider more safety issues.Typical pressurization Technology for Heating Processing is as shown in Figure 2.
Negative-pressure type handling process reduces the oxygen content in processing meanss by the method that vacuumizes, processes kiln inner pressure one
As in 0.15～0.35atm or so, thus the inert medias such as steam, nitrogen or deep fat need not be prepared, the row in processing procedure
Put that thing level is relatively low, but air capacity reduces the heat-conducting medium amount for also reducing processing environment simultaneously so that convection heat transfer' heat-transfer by convection
Become difficult.In order to improve heat transfer efficiency, generally, be improve blower fan rotating speed.Pressure of the rotating speed of blower fan in 0.2atm
Need to reach 1930rpm under the conditions of power, and during normal pressure, only need 635rpm to can reach identical heat-transfer effect.Subnormal ambient is same simultaneously
When certain inhibitory action is served to the degraded of hemicellulose, thus the temperature levels of the PROCESS FOR TREATMENT commonly reach 225-
230 DEG C, higher than other techniques（Referring to Fig. 3）.Some Negative pressure technical schemes install heating plate additional in kiln, by conduction pattern
Timber is heated, but as heating plate needs to occupy the certain space in kiln in itself, is processed effective capacity of kiln and is subject to
Notable loss.
Blended process technique will be heat-treated and be completed in two different devices step by step, and timber is first placed in height by the first step
Processed in pressure water or steam ambient, the moisture content of timber is higher after process, thus first will second step before processing is carried out
Timber is placed in dry kiln and is dried, and moisture content is down to 10% or so, again timber is put into atmospheric steam or nitrogen afterwards
For being processed in the environment of shielding gas.Heat treatment process is decomposed into several relatively independent steps by mixed processing technique, is led to
Cross the available less device of the optimization of device proportioning and technique and realize higher yield, but generally it is on device and technique
All than other complex process much, thus seldom it is used at present.
Content of the invention
It is an object of the invention to provide a kind of without the need for heating or protection medium, quickly can heat, energy consumption is low, facilities and equipments
Simply, the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique without potential safety hazard.
Timber heat modification method based on normal pressure intensification negative pressure heat preservation technique of the present invention, it comprises the steps：
A, timber sawn timber is heated in atmospheric air environment：Timber is placed in process kiln and is heated to 115-
125 °C, 50-70min is kept, the moisture content of timber is preheated and is reduced to timber；Then will with 8-12 °C/h heating rates
Wood temperature rises to 150 °C -190 °C；
B, insulation step-down：Vacuumize to processing kiln, reduce kiln inner pressure to 0.2～0.3atm, and keeping temperature is not
Become, temperature retention time is in 1～3h；
C, the multiple pressure of cooling：Stop heating, be gradually lowered the temperature for processing kiln, and air be passed through to processing in kiln, by pressure
It is gradually restored to normal pressure level.
Beneficial effects of the present invention：The characteristic of the present invention essentially consists in normal pressure and rises gentle negative pressure heat preservation.
Normal pressure intensification is that timber is heated in atmospheric air environment, and the step can be divided into two stages, first stage
115-125 °C being heated to, and keeping 50-70min, the moisture content of timber is preheated and is reduced to timber.Second stage is by wood
Material temperature rises to 150 °C -190 °C（Only adjust wood color and be typically warming up to 160 °C or so, adjust wood color and improve dimensional stability
180 °C or so are typically warming up to）, heating rate is about in 8-12 °C/h.Due to the presence of oxygen in processing environment, chemistry in timber
The degraded that component occurs can reach effect of traditional negative pressure handling process at a temperature of higher height reason with restructuring level.This method
Treatment temperature damages the mechanical strength of timber less than 200 °C because the degradation speed higher than timber after the temperature significantly aggravates
Lose excessive, and now the yield of flammable organic volatile is dramatically increased in timber, brings potential safety hazard to handling process.
Negative pressure heat preservation is to vacuumize to processing kiln after Wood temperature reaches target temperature, reduces kiln inner pressure to 0.2
～0.3atm, and keep treatment temperature constant.The subnormal ambient of the step can play two effects：（1）Reduce processing environment
In oxygen content, it is to avoid there is excessive degradation in continuous high temperature environment in timber, at the same ensure processing environment security；（2）
In the method, when starting to vacuumize in kiln, timber has reached treatment temperature, and the vacuum for now improving processing environment can increase
Plus the heat insulating ability of processing meanss, the heat loss of timber is reduced, the energy consumption of holding stage is reduced.The present invention is totally different from existing
Negative pressure technique, existing Negative pressure technique is that the raising of vacuum makes timber under negative pressure to timber heat temperature raising
Convective Heating encounter difficulties, become restriction timber and reach the principal element of target process temperature.The present invention is in holding stage
Using negative pressure, process kiln radiating is effectively prevent too fast.
Technical scheme is primarily adapted for use in the broad-leaved wood species of interior products, can adjust the wood color of timber simultaneously significantly
Improve the dimensional stability of timber.This method major advantage：
1）This method need not prepare any heating or protection medium（Steam, deep fat, nitrogen etc.）, processing system is simplified,
Cost is reduced, the corrosion to device has been greatly reduced.
2）This method is carried out under normal pressure and condition of negative pressure, there is no the potential safety hazard produced because of high pressure.
3）Two kinds of pressure conditions of this method can be realized in the same apparatus, without the need for preparing different device respectively, be one
Plant the handling process of " integration ".
4）This method overcome heat conduction that traditional negative pressure technique brought due to heat transfer medium deficiency difficult or need additional plus
The defect of hot plate, it is possible to achieve quick heating.
5）This method can realize traditional negative pressure technique modification levels at relatively high temperatures at a lower temperature, reduce plus
The hot time, reduce energy consumption.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, in step c, when temperature is less than 100 °
Air is passed through into process kiln during C, pressure is gradually restored to normal pressure level, while to process kiln internal spraying water.So may be used
To adjust the moisture content of timber.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, is heated up with 8-12 °C/h in step a
During ramp, to process kiln internal spraying water.Can suitably to kiln internal spraying water is processed in temperature-rise period, water is in height
The lower rapid humidity for gasifying, can adjusting process kiln of temperature, prevents timber cracking and causes quality problems, while guarantee is processed
The security of process.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, had step before step a：a0、
Timber is pre-processed：High temperature drying is carried out to timber sawn timber first so that moisture content is in 2-4%.As such, it is possible to prevent timber from existing
Occur the quality problems caused because drying in high-temperature process.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, is heated up with 8-12 °C/h in step a
Wood temperature is risen to 155 °C -165 °C by speed.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, is heated up with 8-12 °C/h in step a
Wood temperature is risen to 175 °C -185 °C by speed.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, in step b, for thickness 2cm's
Timber, temperature retention time 1h；For the timber of thickness 5cm, temperature retention time 3h.
Description of the drawings
Fig. 1 is Thermowood Technology for Heating Processing temperature profiles；
Fig. 2 is pressurization Technology for Heating Processing temperature, pressue-graph；
Fig. 3 is negative pressure Technology for Heating Processing temperature, pressue-graph；
Fig. 4 is normal pressure intensification negative pressure heat preservation Technology for Heating Processing temperature, pressue-graph.
Specific embodiment
Based on the timber heat modification method of normal pressure intensification negative pressure heat preservation technique, concrete technology step is as follows：
1）Timber is pre-processed：This method is applied to timber sawn timber, and pending material should first carry out high temperature drying, and moisture content is in
Reduced levels, typically should occur the quality problems caused because drying 3% or so to prevent timber in high-temperature process.
2）Timber is heated：Process material to be heated in atmospheric air environment.Referring to Fig. 4, the step can be divided into two ranks
Section, first stage are heated to 120 °C or so, carry out the moisture content for preheating and further reducing timber to timber.Due to timber
Moisture content is relatively low, thus the heating rate in this stage may be provided at higher level without causing cracking or the deformation of timber,
Typically initial temperature in kiln can be set in 70 °C, after Wood temperature reaches kiln temperature, temperature be risen to 120 °C rapidly, and
Keep 1h or so.Wood temperature is risen to 160 °C (only adjusting wood color) or 180 °C by second stage（Adjust wood color and improve size
Stability）Left and right, heating rate is about in 10 °C/h.Due to the presence of oxygen in processing environment, in timber, chemical constituent occurs
Degraded can reach effect of traditional negative pressure handling process at a temperature of higher height reason with restructuring level.The treatment temperature of this method is not
More than 200 °C, because the degradation speed higher than timber after the temperature significantly aggravates, lose the mechanical strength of timber excessive, and
And now the yield of flammable organic volatile is dramatically increased in timber, brings potential safety hazard to handling process.In this stage
Can suitably to kiln internal spraying water in processing procedure, water gasifies rapidly at high temperature, can adjust the humidity for processing kiln, prevent wood
Material is cracking, while ensureing the security of processing procedure.
3）Insulation step-down：Wood temperature is vacuumized to processing kiln after reaching target temperature, reduces kiln inner pressure to 0.2
～0.3atm, and keep treatment temperature constant.Referring to Fig. 4, temperature retention time is adjusted according to the processing requirement and size of timber, about
In 1～3h.To thickness 2cm or so flooring board blank, 1h process times can reach processing requirement, and for 5cm or so
Wood for furniture raw material, process time can extend to 2～3h.The subnormal ambient in the stage can play two effects：（1）At reduction
Oxygen content in reason environment, it is to avoid timber excessive degradation occurs in continuous high temperature environment, while ensure the safety of processing environment
Property；（2）In existing Negative pressure technique, the raising of vacuum makes the Convective Heating of timber encounter difficulties, and becomes restriction timber
The principal element of target process temperature is reached, and in the method, timber has reached treatment temperature when starting to vacuumize in kiln, this
The vacuum of Shi Tigao processing environments can increase the heat insulating ability of processing meanss on the contrary, reduce the heat loss of timber, reduce guarantor
The energy consumption of thermophase.
4）Cooling damping：Stop heating, be gradually lowered the temperature for processing kiln, be passed through into kiln when temperature is less than 100 °C
Pressure is gradually restored to normal pressure level by air, while to kiln internal spraying water, to adjust the moisture content of timber.
Significantly can deepen through the Wood color after this method modification, dimensional stability obtains larger raising.According to existing
There is research, when Wood temperature is reached after 160 °C, the chemical constituent in timber, particularly hemicellulose start significantly drop occur
Solution, wood color start significantly intensification occur, thus the temperature is also regarded as being heat-treated modified initial temperature.When temperature levels enter one
When step brings up to 180 °C or so, the Degradation Level of hemicellulose is improved, and the hydrophilic radical in timber is reduced, and the size of timber is steady
Qualitative it is improved significantly.The Thermowood techniques of Finland are by Thermo-S（Dimensionally stable）The broadleaf treatment temperature of level sets
185 °C of main theory is scheduled on according to i.e. here.The temperature rise period of this method technique is carried out under the conditions of atmospheric air, due to oxygen
The presence of gas, the Degradation Level of this stage Wood chemical composition is higher than existing handling process, but is in holding stage, kiln
The high temperature pyrolysis of timber are had certain inhibitory action by partial vacuum, thus this stage timber pyrolysis level again
Common process is less than, therefore in general, its modified effect is suitable with the conventional treatment under identical temperature levels.
Claims (7)
1. a kind of timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, is characterized in that：It comprises the steps：
A, timber sawn timber is heated in atmospheric air environment：Timber is placed in process kiln and is heated to 115-125 °C,
50-70min is kept, and the moisture content of timber is preheated and is reduced to timber；Then with 8-12 °C/h heating rates by timber temperature
Degree rises to 150 °C -190 °C；
B, insulation step-down：Vacuumize to processing kiln, reduce kiln inner pressure to 0.2～0.3atm, and keeping temperature is constant, protect
The warm time is in 1～3h；
C, the multiple pressure of cooling：Stop heating, be gradually lowered the temperature for processing kiln, and air be passed through to processing in kiln, by pressure gradually
Return to normal pressure level.
2. the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique as claimed in claim 1, is characterized in that：Step
In c, air is passed through when temperature is less than 100 °C into process kiln, pressure is gradually restored to normal pressure level, while to process kiln
Internal spraying water.
3. the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique as claimed in claim 1, is characterized in that：Step
In a with 8-12 °C/h heating rate temperature-rise periods in, to process kiln internal spraying water.
4. the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique as claimed in claim 1, is characterized in that：In step
There is step before rapid a：A0, timber pretreatment：High temperature drying is carried out to timber sawn timber first so that moisture content is in 2-4%.
5. the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique as claimed in claim 1, is characterized in that：Step
Wood temperature is risen to 155 °C -165 °C with 8-12 °C/h heating rates in a.
6. the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique as claimed in claim 1, is characterized in that：Step
Wood temperature is risen to 175 °C -185 °C with 8-12 °C/h heating rates in a.
7. the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique as claimed in claim 1, is characterized in that：Step
In b, for the timber of thickness 2cm, temperature retention time 1h；For the timber of thickness 5cm, temperature retention time 3h.
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| CN112973370A (en) * | 2021-03-01 | 2021-06-18 | 北京林业大学 | VOC (volatile organic compound) treatment and water recovery device and method for wood heat treatment |
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Application publication date: 20160330 Assignee: Dongguan Qi Shi Kama Guitar Factory Assignor: Nanjing Forestry University Contract record no.: 2018320000211 Denomination of invention: Wood thermal modification method based on normal-pressure heating and negative-pressure heat-preserving process Granted publication date: 20170315 License type: Common License Record date: 20181019 |
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