CN105437342A - Wood thermal modification method based on normal-pressure heating and negative-pressure heat-preserving process - Google Patents
Wood thermal modification method based on normal-pressure heating and negative-pressure heat-preserving process Download PDFInfo
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- CN105437342A CN105437342A CN201610002660.2A CN201610002660A CN105437342A CN 105437342 A CN105437342 A CN 105437342A CN 201610002660 A CN201610002660 A CN 201610002660A CN 105437342 A CN105437342 A CN 105437342A
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- 238000000034 method Methods 0.000 title claims abstract description 86
- 230000008569 process Effects 0.000 title claims abstract description 52
- 238000010438 heat treatment Methods 0.000 title claims abstract description 43
- 239000002023 wood Substances 0.000 title claims abstract description 34
- 238000002715 modification method Methods 0.000 title claims abstract description 21
- 238000004321 preservation Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 8
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 23
- 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
- 239000000126 substance Substances 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 229920002488 Hemicellulose Polymers 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000001105 regulatory effect Effects 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
- 241000351396 Picea asperata Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000168036 Populus alba Species 0.000 description 1
- 239000002253 acid Substances 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
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 239000007789 gas Substances 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
- 230000036961 partial effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 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 invention provides a wood thermal modification method based on a normal-pressure heating and negative-pressure heat-preserving process, and the wood thermal modification method does not need to heat or protect a medium, can quickly heat, is low in energy consumption, is simple in implementation equipment, and is free of potential safety hazard. The wood thermal modification method comprises the following steps: placing wood sawn timber into a treatment kiln and heating the wood sawn timber to a temperature of 115-125 DEG C in a normal-pressure air environment, keeping the temperature for 50-70 minutes, pre-heating wood, and reducing moisture content of the wood; then, rising the wood temperature to a temperature of 150-190 DEG C at a heating rate of 8-12 DEG C/h; then, carrying out vacuum pumping on the treatment kiln, reducing pressure in the kiln to 0.2-0.3atm, and keeping the temperature unchanged for 1-3 hours; and finally, stopping heating, gradually reducing the temperature of the treatment kiln, introducing air into the treatment kiln and gradually restoring the pressure to the normal-pressure level.
Description
Technical field
The present invention relates to a kind of novel timber method of modifying, to regulate appearance color and the dimensional stability of timber, belong to Wooden modifying field.
Background technology
Timber heat modification, also referred to as heat_treated wood, is a kind of method being carried out by timber heating in the inert environments of 200 ° of about C.Under this temperature levels, the hemicellulose generating portion degraded in timber, cellulosic degree of crystallinity increases, the chemical constituent of lignin is also recombinated, and the moisture in timber and hydrophilic radical are reduced, and chromophoric group changes, to regulate its wood color, increase its dimensional stability.
The thermally-denatured laboratory of timber is explored and is originated from the thirties in last century, and Industry Promotion then starts from the nineties in last century.Classify by the stress level for the treatment of media, mainly contain normal pressure type at present, negative-pressure type, compression type and mixed type four kinds of techniques.
Normal pressure type technique is with water vapour, and nitrogen or deep fat are heat medium, gets rid of or reduce the oxygen content in processing environment while heating timber, to prevent timber from high temperature over oxidation occurring, also reduces the fire risk in processing procedure.The Thermowood technique of Finland is typical normal pressure Technology for Heating Processing (see Fig. 1).This technique mainly with Northern Europe pine, dragon spruce, birch and white poplar for handling object, be made up of 3 stages, first timber carry out drying (stage 1) under the condition being up to 130 ° of C, and drying time adjusts according to the first moisture content of timber.At ensuing heat treatment stages (stage 2), timber heats at the temperature of 185 ~ 215 ° of C, specifically selects temperature to depend on timber kind and product purpose.Degraded and the change causing wood performance of recombinating is there is in the chemical constituent of this stage wood cell wall.The duration of heat treatment stages is 2 ~ 3h, and enter cooling and damping stage (stage 3) afterwards, kiln temperature is reduced by atomized water spraying, and timber also absorbs certain moisture in the process, and moisture control is 4 ~ 7% the most at last.The main deficiency of atmospheric processes is that the preparation of heat medium adds the cost of process, needs to carry out corresponding waste water simultaneously, and waste oil recycles.
Pressing technology adopts steam or water to be treatment media, and its airtight high humidity environment is conducive to the hydrolysis promoting hemicellulose in timber, can realize good modified effect under lower temperature levels; But due to wood hydrolysate slant acidity, thus acid high humidity environment also exacerbates the erosion to treating apparatus, the raising of stress level also means and needs to consider more safety issues in running.Typical pressurized heat treatment process as shown in Figure 2.
Negative-pressure type treatment process reduces the oxygen content in treating apparatus by the method vacuumized, process kiln inner pressure is generally at about 0.15 ~ 0.35atm, thus without the need to preparing the inert medias such as steam, nitrogen or deep fat, emission level in processing procedure is also lower, but the minimizing of air capacity also reduces the heat-conducting medium amount of processing environment simultaneously, convection heat transfer' heat-transfer by convection is made to become difficulty.In order to improve heat transfer efficiency, generally, be the rotating speed improving blower fan.The rotating speed of blower fan needs to reach 1930rpm under the pressure condition of 0.2atm, and only needs the heat-transfer effect that 635rpm can reach identical during normal pressure.Subnormal ambient double cellulosic degraded simultaneously simultaneously serves certain inhibitory action, and thus the temperature levels of this PROCESS FOR TREATMENT generally reaches 225-230 DEG C, higher than other technique (see Fig. 3).Some Negative pressure technical scheme installs heating plate additional in kiln, is heated timber by conduction pattern, but needs the certain space that occupies in kiln due to heating plate itself, and process effective capacity of kiln receives remarkable loss.
Heat treatment completes step by step by blended process technique in two different devices; the first step first timber is placed in water under high pressure or steam ambient processes; after process, the moisture content of timber is higher; thus first timber to be placed in dry kiln before carrying out second step process and carry out drying; moisture content is down to about 10%, again timber is put into afterwards and process for protecting the environment of gas with atmospheric steam or nitrogen.Heat treatment process is decomposed into several relatively independent step by mixed processing technique, higher output is realized by the available less device of optimization of device proportioning and technique, but generally it on device and technique all than other complex process many, thus there be limited evidence currently of is used.
Summary of the invention
The object of this invention is to provide a kind of without the need to heating or protective medium, can Fast Heating, energy consumption is low, facilities and equipments are simple, without the timber heat modification method based on normal pressure intensification negative pressure heat preservation technique of 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 to be heated in atmospheric air environment: timber is placed in process kiln and is heated to 115-125 ° of C, keep 50-70min, preheating is carried out to timber and reduces the moisture content of timber; Then with 8-12 ° of C/h heating rate, Wood temperature is risen to 150 ° of C-190 ° of C;
B, insulation step-down: vacuumize process kiln, reduce kiln inner pressure to 0.2 ~ 0.3atm, and keep temperature-resistant, temperature retention time is at 1 ~ 3h;
C, the multiple pressure of cooling: stop heating, reduce the temperature of process kiln gradually, and pass into air in process kiln, pressure is returned to normal pressure level gradually.
Beneficial effect of the present invention: characteristic of the present invention is mainly that normal pressure heats up and negative pressure heat preservation.
Normal pressure intensification and timber heat in atmospheric air environment, and this step can be divided into two stages, and the first stage is heated to 115-125 ° of C, and keeps 50-70min, carry out preheating and reduce the moisture content of timber to timber.Wood temperature is risen to 150 ° of C-190 ° of C(and only regulates wood color to be generally warming up to 160 ° of about C by second stage, regulates wood color and improve dimensional stability to be generally warming up to 180 ° of about C), heating rate is about 8-12 ° of C/h.Due to the existence of oxygen in processing environment, the degraded that in timber, chemical constituent occurs and restructuring level can reach the effect of traditional negative pressure treatment process under higher height Li Wendu.The treatment temperature of this method is no more than 200 ° of C, because significantly aggravate higher than the degradation speed of timber after this temperature, the mechanical strength of timber is lost excessive, and now in timber the generation of flammable organic volatile significantly increase, bring potential safety hazard to treatment process.
After negative pressure heat preservation and Wood temperature reach target temperature, process kiln is vacuumized, reduce kiln inner pressure to 0.2 ~ 0.3atm, and keep treatment temperature constant.The subnormal ambient of this step can play two effects: (1) reduces the oxygen content in processing environment, avoids timber to occur excessive degradation in continuous high temperature environment, ensures the security of processing environment simultaneously; (2) in the method, when starting in kiln to vacuumize, timber reaches treatment temperature, and the vacuum now improving processing environment can increase the heat insulating ability for the treatment of apparatus, reduces the heat loss of timber, reduces the energy consumption of holding stage.The present invention is different from existing Negative pressure technique completely, and existing Negative pressure technique is under negative pressure to timber heat temperature raising, and the raising of vacuum makes the Convective Heating of timber encounter difficulties, and becomes the principal element that restriction timber reaches target process temperature.The present invention adopts negative pressure at holding stage, effectively prevent the heat radiation of process kiln too fast.
Technical scheme of the present invention is mainly applicable to the broadleaf seeds of interior products, and the wood color of adjustable timber also significantly improves the dimensional stability of timber.This method major advantage:
1) this method is without the need to preparing any heating or protective medium (steam, deep fat, nitrogen etc.), simplifies treatment system, reduces cost, also greatly reduce the corrosion to device.
2) this method is carried out under normal pressure and condition of negative pressure, there is not the potential safety hazard because high pressure produces.
3) two kinds of pressure conditions of this method can realize in the same apparatus, without the need to preparing different device respectively, are the treatment process of a kind of " integration ".
4) this method overcomes the heat conduction difficulty that conventional negative compression technology brings because heat transfer medium is not enough or the defect needing additional heating plate, can realize Fast Heating.
5) this method can realize conventional negative compression technology modification levels at relatively high temperatures at a lower temperature, reduces the heat time, reduces energy consumption.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, in step c, when temperature passes into air lower than during 100 ° of C in process kiln, returns to normal pressure level by pressure gradually, simultaneously to process kiln internal spraying water.The moisture content of timber can be regulated like this.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, with in 8-12 ° of C/h heating rate temperature-rise period in step a, to process kiln internal spraying water.Can suitably to process kiln internal spraying water in temperature-rise period, water at high temperature gasifies rapidly, can regulate the humidity of process kiln, prevents timber from occurring cracking and causing quality problems, ensures the security of processing procedure simultaneously.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, before step a in steps: a0, timber pretreatment: first carry out high temperature drying to timber sawn timber, make moisture content at 2-4%.Like this, can prevent timber from high-temperature process, occurring the quality problems caused because of dry.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, rises to 155 ° of C-165 ° of C with 8-12 ° of C/h heating rate by Wood temperature in step a.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, rises to 175 ° of C-185 ° of C with 8-12 ° of C/h heating rate by Wood temperature in step a.
The above-mentioned timber heat modification method based on normal pressure intensification negative pressure heat preservation technique, in step b, for the timber of thickness 2cm, temperature retention time 1h; For the timber of thickness 5cm, temperature retention time 3h.
Accompanying drawing explanation
Fig. 1 is Thermowood Technology for Heating Processing temperature profile;
Fig. 2 is pressurized heat treatment process 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.
Detailed description of the invention
Based on the timber heat modification method of normal pressure intensification negative pressure heat preservation technique, concrete technology step is as follows:
1) timber pretreatment: this method is applicable to timber sawn timber, pending material first should carry out high temperature drying, and moisture content is in reduced levels, generally about 3%, should occur the quality problems caused because of dry to prevent timber in high-temperature process.
2) timber heating: process material heats in atmospheric air environment.See Fig. 4, this step can be divided into two stages, and the first stage is heated to 120 ° of about C, carries out preheating to go forward side by side the moisture content of the low timber of a step-down to timber.Because the moisture content of timber is lower, thus the heating rate of this one-phase can be arranged on higher level and can not cause cracking or the distortion of timber, generally initial temperature in kiln can be set in 70 ° of C, reach after kiln temperature until Wood temperature and rapidly temperature is risen to 120 ° of C, and keep about 1h.Second stage Wood temperature is risen to 160 ° of C (only regulating wood color) or 180 ° of C(regulate wood color and improve dimensional stability) left and right, heating rate is about 10 ° of C/h.Due to the existence of oxygen in processing environment, the degraded that in timber, chemical constituent occurs and restructuring level can reach the effect of traditional negative pressure treatment process under higher height Li Wendu.The treatment temperature of this method is no more than 200 ° of C, because significantly aggravate higher than the degradation speed of timber after this temperature, the mechanical strength of timber is lost excessive, and now in timber the generation of flammable organic volatile significantly increase, bring potential safety hazard to treatment process.Can suitably to kiln internal spraying water in this level processes, water at high temperature gasifies rapidly, can regulate the humidity of process kiln, prevents timber from occurring cracking, ensures the security of processing procedure simultaneously.
3) step-down is incubated: after Wood temperature reaches target temperature, process kiln is vacuumized, reduce kiln inner pressure to 0.2 ~ 0.3atm, and keep treatment temperature constant.See Fig. 4, temperature retention time adjusts, about 1 ~ 3h according to the processing requirements of timber and size.To the flooring board blank of thickness at about 2cm, the 1h processing time can reach processing requirements, and for the wood for furniture raw material of about 5cm, the processing time can extend to 2 ~ 3h.The subnormal ambient in this stage can play two effects: (1) reduces the oxygen content in processing environment, avoids timber to occur excessive degradation in continuous high temperature environment, ensures the security of processing environment simultaneously; (2) in existing Negative pressure technique, the raising of vacuum makes the Convective Heating of timber encounter difficulties, become the principal element that restriction timber reaches target process temperature, and in the method, when starting in kiln to vacuumize, timber reaches treatment temperature, the vacuum now improving processing environment can increase the heat insulating ability for the treatment of apparatus on the contrary, reduces the heat loss of timber, reduces the energy consumption of holding stage.
4) to lower the temperature damping: stop heating, reduce the temperature of process kiln gradually, when temperature passes into air lower than during 100 ° of C in kiln, pressure is returned to normal pressure level gradually, simultaneously to kiln internal spraying water, to regulate the moisture content of timber.
Wood color after this method modification can significantly be deepened, and dimensional stability obtains larger raising.According to existing research, after Wood temperature reaches 160 ° of C, the chemical constituent in timber, particularly hemicellulose start to occur remarkable degraded, and wood color starts to occur remarkable intensification, and thus this temperature is also regarded as the initial temperature of heat treatment modification.When temperature levels brings up to 180 ° of about C further, the Degradation Level of hemicellulose improves, and the hydrophilic radical in timber reduces, and the dimensional stability of timber is improved significantly.The Thermowood technique of Finland is by Thermo-S(dimensionally stable) the broadleaf treatment temperature of the level main theory that is set in 185 ° of C is according to namely at this.The temperature rise period of this method technique carries out under atmospheric air condition, due to the existence of oxygen, the Degradation Level of this stage Wood chemical composition is higher than existing treatment process, but at holding stage, be in partial vacuum in kiln, to the high temperature pyrolysis of timber, there is certain inhibitory action, thus in the pyrolysis level of this one-phase timber again lower than common process, therefore in general, its modified effect is suitable with the conventional treatment under identical temperature levels.
Claims (7)
1., based on a timber heat modification method for normal pressure intensification negative pressure heat preservation technique, it is characterized in that: it comprises the steps:
A, timber sawn timber to be heated in atmospheric air environment: timber is placed in process kiln and is heated to 115-125 ° of C, keep 50-70min, preheating is carried out to timber and reduces the moisture content of timber; Then with 8-12 ° of C/h heating rate, Wood temperature is risen to 150 ° of C-190 ° of C;
B, insulation step-down: vacuumize process kiln, reduce kiln inner pressure to 0.2 ~ 0.3atm, and keep temperature-resistant, temperature retention time is at 1 ~ 3h;
C, the multiple pressure of cooling: stop heating, reduce the temperature of process kiln gradually, and pass into air in process kiln, pressure is returned to normal pressure level gradually.
2. as claimed in claim 1 based on the timber heat modification method of normal pressure intensification negative pressure heat preservation technique, it is characterized in that: in step c, when temperature passes into air lower than during 100 ° of C in process kiln, pressure is returned to normal pressure level gradually, simultaneously to process kiln internal spraying water.
3. as claimed in claim 1 based on the timber heat modification method of normal pressure intensification negative pressure heat preservation technique, it is characterized in that: with in 8-12 ° of C/h heating rate temperature-rise period in step a, to process kiln internal spraying water.
4., as claimed in claim 1 based on the timber heat modification method of normal pressure intensification negative pressure heat preservation technique, it is characterized in that:: a0, timber pretreatment: first carry out high temperature drying to timber sawn timber, make moisture content at 2-4% before step a in steps.
5., as claimed in claim 1 based on the timber heat modification method of normal pressure intensification negative pressure heat preservation technique, it is characterized in that: in step a, with 8-12 ° of C/h heating rate, Wood temperature is risen to 155 ° of C-165 ° of C.
6., as claimed in claim 1 based on the timber heat modification method of normal pressure intensification negative pressure heat preservation technique, it is characterized in that: in step a, with 8-12 ° of C/h heating rate, Wood temperature is risen to 175 ° of C-185 ° of C.
7., as claimed in claim 1 based on the timber heat modification method of normal pressure intensification negative pressure heat preservation technique, it is characterized in that: in step 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018107317A1 (en) * | 2016-12-12 | 2018-06-21 | 长兴经纬竹制品有限公司 | Preparation process for recombined timber |
| 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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| CN101069972A (en) * | 2007-05-28 | 2007-11-14 | 浙江林学院 | Method for producing charred wood by heat treatment |
| CN103072165A (en) * | 2013-01-05 | 2013-05-01 | 中国热带农业科学院橡胶研究所 | Production method of high-temperature heating modified rubber wood floor |
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| CN101069972A (en) * | 2007-05-28 | 2007-11-14 | 浙江林学院 | Method for producing charred wood by heat treatment |
| CN103072165A (en) * | 2013-01-05 | 2013-05-01 | 中国热带农业科学院橡胶研究所 | Production method of high-temperature heating modified rubber wood floor |
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| 丁涛等: "欧洲木材热处理技术的研究及应用", 《木材工业》 * |
| 李延军等: "高温热处理杉木力学性能与尺寸稳定性研究", 《北京林业大学学》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107317A1 (en) * | 2016-12-12 | 2018-06-21 | 长兴经纬竹制品有限公司 | Preparation process for recombined timber |
| 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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| CN105437342B (en) | 2017-03-15 |
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