CN109434998A - A kind of drying of wood and Low Temperature Heat Treatment integral process - Google Patents
A kind of drying of wood and Low Temperature Heat Treatment integral process Download PDFInfo
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- CN109434998A CN109434998A CN201811351804.0A CN201811351804A CN109434998A CN 109434998 A CN109434998 A CN 109434998A CN 201811351804 A CN201811351804 A CN 201811351804A CN 109434998 A CN109434998 A CN 109434998A
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- temperature heat
- drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/06—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by burning or charring, e.g. cutting with hot wire
-
- 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
-
- 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
-
- 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
- B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Drying Of Solid Materials (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a kind of dryings of wood and Low Temperature Heat Treatment integral process.The drying of wood of the present invention and Low Temperature Heat Treatment integral process, by the related process parameters for rationally controlling vacuumizing phase, heat temperature raising stage, Low Temperature Heat Treatment stage and cooling down stage, it carries out carrying out lightly-carbonized processing to timber using the moisture of heat and discharge in drying process, wood dimensional stability, appropriateness raising weatherability, abundant wood color can be effectively improved to improve ornamental value, avoid loss of strength caused by existing Wood carbonization technique and the too deep problem of color.
Description
Technical field
The present invention relates to wood processing technique fields, and in particular to a kind of drying of wood and Low Temperature Heat Treatment one chemical industry
Skill.
Background technique
Wood materials are originated from naturally, because its texture is natural, color is graceful, are favored by people.Since the biology of timber belongs to
Property and anisotropy, timber when extraneous wet heat condition changes, easily generation drying shrinkage bulking, be a kind of material that size is unstable
Material, this property have an adverse effect to the utilization of timber.China's wildwood resource shortage, artificial forest be China it is important use material
Source, but because growing rapidly, timber stress is big, and dimensional instability becomes apparent, and artificial forest wood color is generally shallower, color list
One, artificial forest product orientation is limited to low-and-medium-grade products in the market, and added value of product is lower, and wood performance urgently improves.
Method to improve wood dimensional stability mainly has high-temperature heat treatment, acetylation, surface covering treatment etc..Its
In, acetylation complex process and environmental protection treatment difficulty is excessively high can not be popularized；Surface covering only changes wood surface performance, can not
Guarantee that total quality is promoted and stablized；Although the high-temperature heat treatment feature of environmental protection is good, and can be effectively improved wood dimensional stability,
High temperature used by high-temperature heat treatment (generally 180 DEG C -230 DEG C) not only causes wood color to deepen, vision and decorative effect
It is deteriorated, also wood component and structure is destroyed, decline strength of wood.Meanwhile because heat treatment cost and wood color etc. are asked
Topic, heat-treated wood is used as outdoor scene to be used with material more at present, and there has been no require for similar furniture and indoor hardware fitting etc.
Beautiful, intensity and dimensional stability take into account the suitable treatment process of product.
Summary of the invention
It is an object of the invention to a kind of drying of wood and Low Temperature Heat Treatment are provided in place of overcome the deficiencies in the prior art
Integral process, improves the dimensional stability of timber, moderately improves its weatherability, enriches wood color and improves ornamental value, keeps away
Exempt from loss of strength caused by existing Wood carbonization technique and the too deep problem of color.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of drying of wood and Low Temperature Heat Treatment integral process, including vacuumizing phase, heat temperature raising stage, Low Temperature Thermal
Processing stage and cooling down stage, wherein vacuumizing phase and heat temperature raising period crossover carry out, and are at least followed three times
Ring makes air pressure in process chamber be maintained at 0.04MPa hereinafter, until moisture content reaches in low temperature heat treatment
10% hereinafter, subsequently into the cooling down stage, specifically includes the following steps:
(1) it vacuumizes: the timber of preparatory naturally dry being placed in process chamber, starts vacuum pump, make to handle room air pressure
Power gradually reduces, and every reduction 0.02-0.03MPa maintains air pressure conditions 20-40min；
(2) heat temperature raising: heating process chamber, heats to 45 DEG C -55 DEG C for the first time, and then heating makes every time
Inner treatment chamber temperature rises 7 DEG C -10 DEG C, until the temperature of process chamber rises to 65-75 DEG C, and maintains the temperature after heating every time
State 30-60min；
(3) Low Temperature Heat Treatment: according to the average value of the moisture content of timber in process chamber, control handles indoor heating speed
Processing room temperature is then increased 4 DEG C -7 DEG C, and maintains state of temperature 30min by degree, the every reduction 4%-7% of moisture content
More than, until processing room temperature is risen to 80 DEG C -140 DEG C when moisture content is reduced to 7%-10%；
(4) cooling down: closing vacuum system, opens equipment ventilation opening, chamber temperature is made to be down to 45 DEG C -50 DEG C.
The present invention combines vacuum drying and the technique in 80 DEG C of -140 DEG C of Low Temperature Heat Treatments, vacuumizes rank by rationally controlling
Section, the related process parameters in heat temperature raising stage, Low Temperature Heat Treatment stage and cooling down stage, utilize the heat in drying process
Amount and the moisture of discharge carry out carrying out lightly-carbonized processing to timber, wood dimensional stability can be effectively improved, appropriateness improve it is resistance to
Hou Xing, abundant wood color avoid loss of strength caused by existing Wood carbonization technique and color are too deep asks to improve ornamental value
Topic.
In heat temperature raising stage and Low Temperature Heat Treatment stage, process chamber should be at sealing state.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the step
(1) in, vacuumize makes the air pressure of process chamber be down to 0.06-0.08MPa for the first time, in subsequent vacuum pumping, processing
The air pressure of room reduces 0.02-0.03MPa every time, until the air pressure of process chamber is down to 0.03-0.04MPa.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the step
(2) in, 48 DEG C -52 DEG C are heated to for the first time.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the step
(2) in, the speed control to heat up every time is 8-9 DEG C/h.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the step
(3) in, the speed control to heat up every time is 5-6 DEG C/h.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the step
(3) in, when moisture content is reduced to 7%-10%, processing room temperature is risen to 90 DEG C -120 DEG C.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the step
(4) in, cooling rate is 8-15 DEG C/h in process chamber.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the step
(4) in, cooling rate is 10-12 DEG C/h in process chamber.
In the cooling down stage, chamber temperature decline cannot be too fast, should be handled by the ventilation speed control of ventilation opening
Room temperature lowering speed is 8-15 DEG C/h, and best cooling rate is 10-12 DEG C/h, avoids timber because of the too fast generation cracking of cooling, becomes
Shape.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the step
(2) into step (4), the internal fan of process chamber keeps operating, and turns to once every 20-30min, makes inner treatment chamber temperature
Degree and humidity tend to uniform.
As the preferred embodiment of the drying of wood of the present invention and Low Temperature Heat Treatment integral process, the timber
It is 30% being dried with naturally dry preparatory before Low Temperature Heat Treatment integrated treatment to moisture content.Timber to be processed should be preparatory
Naturally dry, so that moisture content is dropped to close to fibre saturation point, (according to tree species difference, fibre saturation point range is
26%-32%, usually using 30% as each tree species moisture content average value), disappeared with shortening process cycle and reducing the energy
Consumption.
Compared with prior art, the invention has the benefit that
The present invention combines the technique of vacuum drying and Low Temperature Heat Treatment, and rationally controls vacuumizing phase, heat temperature raising rank
Section, the related process parameters in Low Temperature Heat Treatment stage and cooling down stage, utilize the water of heat and discharge in drying process
Divide and carry out carrying out lightly-carbonized processing to timber, wood dimensional stability can be effectively improved, appropriateness improves weatherability, abundant timber
Color avoids loss of strength caused by existing Wood carbonization technique and the too deep problem of color to improve ornamental value.
Treated the timber of integral process through the invention, compared with unseasoned timber, dimensional stability can be mentioned
High by 5%~20%, hardness can be improved 10%~90%, and bending strength improves 5%~35%, chromatic aberration range 3NBS~
30NBS。
Specific embodiment
Purposes, technical schemes and advantages in order to better illustrate the present invention, below in conjunction with specific embodiment to the present invention
It further illustrates.It will be appreciated by those skilled in the art that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
In embodiment, used experimental method is conventional method unless otherwise specified, material used, reagent etc.,
It is commercially available unless otherwise specified.
Embodiment 1
A kind of drying of wood and Low Temperature Heat Treatment integral process, including vacuumizing phase, heat temperature raising stage, Low Temperature Thermal
Processing stage and cooling down stage, wherein vacuumizing phase and heat temperature raising period crossover carry out, and are at least followed three times
Ring makes air pressure in process chamber be maintained at 0.04MPa hereinafter, until moisture content reaches in low temperature heat treatment
10% hereinafter, subsequently into the cooling down stage, specifically includes the following steps:
(1) it vacuumizes: the quick growth poplar wood of preparatory naturally dry being placed in process chamber, starts vacuum pump, make to handle Interior Space
Atmospheric pressure gradually reduces, and vacuumize makes the air pressure of process chamber be down to 0.06-0.8MPa, subsequent vacuum pumping for the first time
In, the air pressure of process chamber reduces 0.02-0.03MPa every time, and maintains air pressure conditions 20-40min, until processing
The air pressure of room is down to 0.03-0.04MPa；
(2) heat temperature raising: heating process chamber, heats to 48 DEG C for the first time, and then heating makes to handle every time
Chamber interior temperature rises 7 DEG C -10 DEG C, until the temperature of process chamber rises to 70 DEG C, and maintains state of temperature 30- after heating every time
60min, the speed control to heat up every time are 5 DEG C/h；
(3) Low Temperature Heat Treatment: according to the average value of the moisture content of timber in process chamber, control handles indoor heating speed
Degree, moisture content is every to reduce by 6%, then processing room temperature is increased 6 DEG C, and maintain state of temperature 2h, until timber contains
When water rate is reduced to 8%, processing room temperature is risen to 110 DEG C, and maintain 2h；
(4) cooling down: closing vacuum system, opens equipment ventilation opening, with the cooling rate of 8 DEG C/h, makes to handle room temperature
Degree is down to 50 DEG C.
For the step (2) into step (4), the internal fan of process chamber keeps operating, and turns to one every 20-30min
It is secondary, so that inner treatment chamber temperature and humidity is tended to uniform.
In heat temperature raising stage and Low Temperature Heat Treatment stage, process chamber should be at sealing state.
Timber described in the present embodiment is being dried with naturally dry preparatory before Low Temperature Heat Treatment integrated treatment to containing
Water rate is 30%, to shorten process cycle and reduce energy consumption.
After tested, poplar of the present embodiment after this process, compared with untreated poplar, dimensional stability is mentioned
High by 15%, bending strength improves 25%, and hardness improves 50%, is 10NBS with untreated poplar value of chromatism.
Embodiment 2
A kind of drying of wood and Low Temperature Heat Treatment integral process, including vacuumizing phase, heat temperature raising stage, Low Temperature Thermal
Processing stage and cooling down stage, wherein vacuumizing phase and heat temperature raising period crossover carry out, and are at least followed three times
Ring makes air pressure in process chamber be maintained at 0.04MPa hereinafter, until moisture content reaches in low temperature heat treatment
10% hereinafter, subsequently into the cooling down stage, specifically includes the following steps:
(1) it vacuumizes: the fast-growing Eucalyptus of preparatory naturally dry being placed in process chamber, starts vacuum pump, make to handle Interior Space
Atmospheric pressure gradually reduces, and vacuumize makes the air pressure of process chamber be down to 0.06-0.8MPa, subsequent vacuum pumping for the first time
In, the air pressure of process chamber reduces 0.02-0.03MPa every time, and maintains air pressure conditions 20-40min, until processing
The air pressure of room is down to 0.03-0.04MPa；
(2) heat temperature raising: heating process chamber, heats to 52 DEG C for the first time, and then heating makes to handle every time
Chamber interior temperature rises 7 DEG C -10 DEG C, until the temperature of process chamber rises to 70 DEG C, and maintains state of temperature 30- after heating every time
60min, the speed control to heat up every time are 6 DEG C/h；
(3) Low Temperature Heat Treatment: according to the average value of the moisture content of timber in process chamber, control handles indoor heating speed
Degree, moisture content is every to reduce by 4%, then processing room temperature is increased 4 DEG C, and maintain state of temperature 3h, until timber contains
When water rate is reduced to 8%, processing room temperature is risen to 120 DEG C, and maintain 3h；
(4) cooling down: closing vacuum system, opens equipment ventilation opening, with the cooling rate of 8 DEG C/h, makes to handle room temperature
Degree is down to 50 DEG C.
For the step (2) into step (4), the internal fan of process chamber keeps operating, and turns to one every 20-30min
It is secondary, so that inner treatment chamber temperature and humidity is tended to uniform.
In heat temperature raising stage and Low Temperature Heat Treatment stage, process chamber should be at sealing state.
Timber described in the present embodiment is being dried with naturally dry preparatory before Low Temperature Heat Treatment integrated treatment to containing
Water rate is 30%, to shorten process cycle and reduce energy consumption.
After tested, Eucalyptus of this implementation after this process, compared with untreated Eucalyptus, dimensional stability is improved
20%, bending strength improves 30%, and hardness improves 40%, is 15NBS with untreated Eucalyptus value of chromatism.
Embodiment 3
A kind of drying of wood and Low Temperature Heat Treatment integral process, including vacuumizing phase, heat temperature raising stage, Low Temperature Thermal
Processing stage and cooling down stage, wherein vacuumizing phase and heat temperature raising period crossover carry out, and are at least followed three times
Ring makes air pressure in process chamber be maintained at 0.04MPa hereinafter, until moisture content reaches in low temperature heat treatment
10% hereinafter, subsequently into the cooling down stage, specifically includes the following steps:
(1) it vacuumizes: the fast-growing Eucalyptus of preparatory naturally dry being placed in process chamber, starts vacuum pump, make to handle Interior Space
Atmospheric pressure gradually reduces, and vacuumize makes the air pressure of process chamber be down to 0.06-0.8MPa, subsequent vacuum pumping for the first time
In, the air pressure of process chamber reduces 0.02-0.03MPa every time, and maintains air pressure conditions 20-40min, until processing
The air pressure of room is down to 0.03-0.04MPa；
(2) heat temperature raising: heating process chamber, heats to 45 DEG C for the first time, and then heating makes to handle every time
Chamber interior temperature rises 7 DEG C -10 DEG C, until the temperature of process chamber rises to 75 DEG C, and maintains state of temperature 30- after heating every time
60min, the speed control to heat up every time are 8 DEG C/h；
(3) Low Temperature Heat Treatment: according to the average value of the moisture content of timber in process chamber, control handles indoor heating speed
Degree, moisture content is every to reduce by 5%, then processing room temperature is increased 5 DEG C, and maintain state of temperature 2h, until timber contains
When water rate is reduced to 7%, processing room temperature is risen to 90 DEG C, and maintain 2h；
(4) cooling down: closing vacuum system, opens equipment ventilation opening, with the cooling rate of 10 DEG C/h, makes to handle room temperature
Degree is down to 45 DEG C.
For the step (2) into step (4), the internal fan of process chamber keeps operating, and turns to one every 20-30min
It is secondary, so that inner treatment chamber temperature and humidity is tended to uniform.
In heat temperature raising stage and Low Temperature Heat Treatment stage, process chamber should be at sealing state.
Timber described in the present embodiment is being dried with naturally dry preparatory before Low Temperature Heat Treatment integrated treatment to containing
Water rate is 30%, to shorten process cycle and reduce energy consumption.
After tested, Eucalyptus of this implementation after this process, compared with untreated Eucalyptus, dimensional stability is improved
15%, bending strength improves 35%, and hardness improves 90%, is 6NBS with untreated Eucalyptus value of chromatism.
Embodiment 4
A kind of drying of wood and Low Temperature Heat Treatment integral process, including vacuumizing phase, heat temperature raising stage, Low Temperature Thermal
Processing stage and cooling down stage, wherein vacuumizing phase and heat temperature raising period crossover carry out, and are at least followed three times
Ring makes air pressure in process chamber be maintained at 0.04MPa hereinafter, until moisture content reaches in low temperature heat treatment
10% hereinafter, subsequently into the cooling down stage, specifically includes the following steps:
(1) it vacuumizes: the fast-growing Eucalyptus of preparatory naturally dry being placed in process chamber, starts vacuum pump, make to handle Interior Space
Atmospheric pressure gradually reduces, and vacuumize makes the air pressure of process chamber be down to 0.06-0.8MPa, subsequent vacuum pumping for the first time
In, the air pressure of process chamber reduces 0.02-0.03MPa every time, and maintains air pressure conditions 20-40min, until processing
The air pressure of room is down to 0.03-0.04MPa；
(2) heat temperature raising: heating process chamber, heats to 45 DEG C for the first time, and then heating makes to handle every time
Chamber interior temperature rises 7 DEG C -10 DEG C, until the temperature of process chamber rises to 65 DEG C, and maintains state of temperature 30- after heating every time
60min, the speed control to heat up every time are 8 DEG C/h；
(3) Low Temperature Heat Treatment: according to the average value of the moisture content of timber in process chamber, control handles indoor heating speed
Degree, moisture content is every to reduce by 7%, then processing room temperature is increased 7 DEG C, and maintain state of temperature 2h, until timber contains
When water rate is reduced to 7%, processing room temperature is risen to 140 DEG C, and maintain 2h；
(4) cooling down: closing vacuum system, opens equipment ventilation opening, with the cooling rate of 12 DEG C/h, makes to handle room temperature
Degree is down to 50 DEG C.
For the step (2) into step (4), the internal fan of process chamber keeps operating, and turns to one every 20-30min
It is secondary, so that inner treatment chamber temperature and humidity is tended to uniform.
In heat temperature raising stage and Low Temperature Heat Treatment stage, process chamber should be at sealing state.
Timber described in the present embodiment is being dried with naturally dry preparatory before Low Temperature Heat Treatment integrated treatment to containing
Water rate is 30%, to shorten process cycle and reduce energy consumption.
After tested, Eucalyptus of this implementation after this process, compared with untreated Eucalyptus, dimensional stability is improved
5%, bending strength improves 25%, and hardness improves 30%, is 18NBS with untreated Eucalyptus value of chromatism.
Embodiment 5
A kind of drying of wood and Low Temperature Heat Treatment integral process, including vacuumizing phase, heat temperature raising stage, Low Temperature Thermal
Processing stage and cooling down stage, wherein vacuumizing phase and heat temperature raising period crossover carry out, and are at least followed three times
Ring makes air pressure in process chamber be maintained at 0.04MPa hereinafter, until moisture content reaches in low temperature heat treatment
10% hereinafter, subsequently into the cooling down stage, specifically includes the following steps:
(1) it vacuumizes: the fast-growing Eucalyptus of preparatory naturally dry being placed in process chamber, starts vacuum pump, make to handle Interior Space
Atmospheric pressure gradually reduces, and vacuumize makes the air pressure of process chamber be down to 0.06-0.8MPa, subsequent vacuum pumping for the first time
In, the air pressure of process chamber reduces 0.02-0.03MPa every time, and maintains air pressure conditions 20-40min, until processing
The air pressure of room is down to 0.03-0.04MPa；
(2) heat temperature raising: heating process chamber, heats to 55 DEG C for the first time, and then heating makes to handle every time
Chamber interior temperature rises 7 DEG C -10 DEG C, until the temperature of process chamber rises to 70 DEG C, and maintains state of temperature 30- after heating every time
60min, the speed control to heat up every time are 9 DEG C/h；
(3) Low Temperature Heat Treatment: according to the average value of the moisture content of timber in process chamber, control handles indoor heating speed
Degree, moisture content is every to reduce by 7%, then processing room temperature is increased 7 DEG C, and maintain state of temperature 2h, until timber contains
When water rate is reduced to 10%, processing room temperature is risen to 80 DEG C, and maintain 2h；
(4) cooling down: closing vacuum system, opens equipment ventilation opening, with the cooling rate of 15 DEG C/h, makes to handle room temperature
Degree is down to 50 DEG C.
For the step (2) into step (4), the internal fan of process chamber keeps operating, and turns to one every 20-30min
It is secondary, so that inner treatment chamber temperature and humidity is tended to uniform.
In heat temperature raising stage and Low Temperature Heat Treatment stage, process chamber should be at sealing state.
Timber described in the present embodiment is being dried with naturally dry preparatory before Low Temperature Heat Treatment integrated treatment to containing
Water rate is 30%, to shorten process cycle and reduce energy consumption.
After tested, Eucalyptus of this implementation after this process, compared with untreated Eucalyptus, dimensional stability is improved
12%, bending strength improves 15%, and hardness improves 30%, is 3NBS with untreated Eucalyptus value of chromatism.
Treated the more untreated material of timber of integral process through the invention, depending on the application and treatment process is different,
Its dimensional stability improves 5%~20% than untreated material, and hardness improves 10%~90% than traditional carbide wood, bending strength
5%~35% is improved, chromatic aberration range is in 3NBS~30NBS.
In conclusion the drying of wood of the present invention and Low Temperature Heat Treatment integral process, by rationally controlling pumping
Vacuum stages, the related process parameters in heat temperature raising stage, Low Temperature Heat Treatment stage and cooling down stage, utilize drying process
In heat and the moisture of discharge carry out carrying out lightly-carbonized processing to timber, wood dimensional stability, appropriateness can be effectively improved
Weatherability, abundant wood color are improved to improve ornamental value, avoids loss of strength and color caused by existing Wood carbonization technique
Too deep problem.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should
Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention
And range.
Claims (10)
1. a kind of drying of wood and Low Temperature Heat Treatment integral process, which is characterized in that including vacuumizing phase, heat temperature raising rank
Section, Low Temperature Heat Treatment stage and cooling down stage, wherein vacuumizing phase and heat temperature raising period crossover carry out, and carry out
It at least recycles three times, in low temperature heat treatment, air pressure in process chamber is made to be maintained at 0.04MPa hereinafter, until timber
Moisture content reaches 10% hereinafter, subsequently into the cooling down stage, specifically includes the following steps:
(1) vacuumize: the timber of preparatory naturally dry being placed in process chamber, starts vacuum pump, make in process chamber air pressure by
Step reduces, and every reduction 0.02-0.03MPa maintains air pressure conditions 20-40min；
(2) heat temperature raising: heating process chamber, heats to 45 DEG C -55 DEG C for the first time, and then heating makes to handle every time
Chamber interior temperature rises 7 DEG C -10 DEG C, until the temperature of process chamber rises to 65-75 DEG C, and maintains the state of temperature after heating every time
30-60min；
(3) Low Temperature Heat Treatment: according to the average value of the moisture content of timber in process chamber, control handles indoor heating rate, wood
Processing room temperature is then increased 4 DEG C -7 DEG C, and maintains the state of temperature 30min or more by the every reduction 4%-7% of material moisture content,
Until processing room temperature is risen to 80 DEG C -140 DEG C when moisture content is reduced to 7%-10%；
(4) cooling down: closing vacuum system, opens equipment ventilation opening, chamber temperature is made to be down to 45 DEG C -50 DEG C.
2. the drying of wood according to claim 1 and Low Temperature Heat Treatment integral process, which is characterized in that the step
(1) in, vacuumize makes the air pressure of process chamber be down to 0.06-0.08MPa for the first time, in subsequent vacuum pumping, processing
The air pressure of room reduces 0.02-0.03MPa every time, until the air pressure of process chamber is down to 0.03-0.04MPa.
3. the drying of wood according to claim 1 and Low Temperature Heat Treatment integral process, which is characterized in that the step
(2) in, 48 DEG C -52 DEG C are heated to for the first time.
4. the drying of wood according to claim 3 and Low Temperature Heat Treatment integral process, which is characterized in that the step
(2) in, the speed control to heat up every time is 8-9 DEG C/h.
5. the drying of wood according to claim 3 and Low Temperature Heat Treatment integral process, which is characterized in that the step
(2) in, the speed control to heat up every time is 5-6 DEG C/h.
6. the drying of wood according to claim 1 and Low Temperature Heat Treatment integral process, which is characterized in that the step
(3) in, when moisture content is reduced to 7%-10%, processing room temperature is risen to 90 DEG C -120 DEG C.
7. the drying of wood according to claim 1 and Low Temperature Heat Treatment integral process, which is characterized in that the step
(4) in, cooling rate is 8-15 DEG C/h in process chamber.
8. the drying of wood according to claim 7 and Low Temperature Heat Treatment integral process, which is characterized in that the step
(4) in, cooling rate is 10-12 DEG C/h in process chamber.
9. the drying of wood according to claim 1 and Low Temperature Heat Treatment integral process, which is characterized in that the step
(2) into step (4), the internal fan of process chamber keeps operating, and turns to once every 20-30min, makes inner treatment chamber temperature
Degree and humidity tend to uniform.
10. described in any item dryings of wood and Low Temperature Heat Treatment integral process according to claim 1~9, which is characterized in that
The timber is 30% being dried with naturally dry preparatory before Low Temperature Heat Treatment integrated treatment to moisture content.
Priority Applications (1)
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