CN115751848A - Vacuum drying device applied to wood santalum album and drying method thereof - Google Patents
Vacuum drying device applied to wood santalum album and drying method thereof Download PDFInfo
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- CN115751848A CN115751848A CN202211423129.4A CN202211423129A CN115751848A CN 115751848 A CN115751848 A CN 115751848A CN 202211423129 A CN202211423129 A CN 202211423129A CN 115751848 A CN115751848 A CN 115751848A
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- 239000002023 wood Substances 0.000 title claims abstract description 87
- 238000001035 drying Methods 0.000 title claims abstract description 24
- 238000001291 vacuum drying Methods 0.000 title claims abstract description 21
- 240000000513 Santalum album Species 0.000 title claims description 4
- 235000008632 Santalum album Nutrition 0.000 title claims description 4
- 239000011229 interlayer Substances 0.000 claims abstract description 84
- 238000012545 processing Methods 0.000 claims abstract description 76
- 239000010410 layer Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004566 building material Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000004321 preservation Methods 0.000 abstract description 5
- 239000012808 vapor phase Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011120 plywood Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 241000121612 Lepechinia calycina Species 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a vacuum drying device applied to wood purlin timber and a method thereof, the core is that an expandable interlayer cavity is arranged between the inner wall of an airtight processing container and the wood purlin timber, the interlayer cavity is used as a buffer layer of air pressure difference during negative pressure type drying processing, the pressure of one atmosphere pressure formed on the outer wall of the processing container by external air under normal pressure after the vacuum state is formed in the container can be counteracted, meanwhile, a resistance-type heating plate arranged on the inner wall of the interlayer cavity is used for carrying out temperature rise type heat preservation on the air in the interlayer cavity in a heat convection mode under the control of a sensor and a temperature controller, and the generated heat energy is transmitted to the outer layer of the wood purlin timber through the inner wall of the interlayer cavity in a heat conduction mode, so that the wood purlin timber is ensured to maintain a physical index of 50 ℃ which is higher than the moisture vapor phase temperature in the vacuum state.
Description
Technical Field
The invention relates to the technical field of vacuum drying, in particular to a vacuum drying device and a drying method for wood and wood balk.
Background
The wood balk is an important raw material in the furniture processing and production process. The moisture content of wood balk without drying treatment is higher than 25%, which is far different from the requirement of 5% -8% moisture content in the wood product processing industry. Before the wood balk is used, the wood balk is generally required to be dried, and the conventional material drying is divided into normal pressure drying and vacuum drying.
The normal pressure drying generally uses a drying chamber as a processing container for wood balk, then hot air or hot steam is applied to increase the internal ambient temperature of the processing container, and the temperature difference between the ambient temperature of nearly 100 ℃ and the original temperature of the wood balk is utilized to promote the accelerated evaporation of the internal moisture, thereby finally achieving the purpose of drying the wood balk. The disadvantages are: the processing period is longer, and is generally a time unit of weeks or even months; different tree species or wood balms with large thickness difference can not be mixed in the same processing batch, otherwise, the temperature control curve parameters and the processing period are difficult to set; in addition, the peripheral processing temperature of nearly 100 ℃ increases the risk of wood purlin deformation caused by uneven transfer of thermal expansion and cold contraction of the wood purlin.
Vacuum drying generally utilizes the physical index of moisture vapor phase temperature in a vacuum state, and uses a metal vacuum kettle as a processing container for carrying out vacuum drying treatment on wood balk wood, namely, a processing mode is presented for reducing the thermal deformation risk of wood balk wood at a preheating temperature of about 50 ℃ and manufacturing an external environment with reduced moisture vapor phase condition. The disadvantages are that: 1. in order to balance the atmospheric pressure of one atmospheric pressure (i.e. 1 Kgf/cm) to which the outer wall of the vacuum kettle needs to bear after the vacuum is formed in the vacuum kettle, the vacuum kettle only needs to adopt the cylindrical structural shape with the most uniform pressure distribution and the highest compressive strength as its processing container and manufacture the vacuum kettle with a steel structure which is relatively expensive in manufacturing cost, so that the manufacturing cost and maintenance cost are often prohibitive to potential users. 2. An unusable space of around 40% is naturally formed between the circular end face design which achieves the best compression resistance effect and the square end face which achieves the best stacking effect of the wood purlin, and the proportion is not improved along with the enlargement of the cylindrical structure (see fig. 1). 3. The vacuum kettle can only adopt a radiant heater which is difficult to detect the actual heating result to measure the temperature in a vacuum state, and the subsequent heat preservation control at 50 ℃ is difficult and is easy to exceed or be lower than the control range at 50 ℃. Thus, the prior art is in need of improvement and advancement.
Disclosure of Invention
The invention aims to overcome the defects of the existing vacuum drying technology for wood purlin wood, and provides a vacuum drying device applied to wood purlin wood and a drying method thereof, wherein the manufacturing cost and the maintenance cost of an airtight processing container are reduced, the available processing space in the container is increased, and uniform heat preservation and no deformation in the processing process of the wood purlin wood are ensured.
The purpose of the invention is realized by the following technical solution: a vacuum drying device applied to wood purlin timber comprises: place wooden santalum album processing container, produce vacuum negative pressure's vacuum pump, produce the air compressor of malleation, produce thermal resistance-type generate heat the board and detect air temperature's sensor and temperature controller, its characterized in that: the processing container capable of being airtight is made of heat-insulating materials, the internal space of the processing container is rectangular, wood beams are placed on the bottom surface of the processing container, interlayer cavities capable of expanding and contracting flexibly are arranged on the inner walls of the periphery and the inner wall of the upper portion of the processing container, the interlayer cavities are divided into an outer layer and an inner layer, an inner cavity is arranged between the outer layers of the inner layers, the outer layers of the interlayer cavities are tightly adhered to the inner wall of the processing container without gaps, the interlayer cavities serve as buffer layers of air pressure difference during negative-pressure drying processing, the inner layers of the interlayer cavities hermetically wrap the wood beams placed on the bottom surface of the processing container, the airtight space of the interlayer cavities is connected with a vacuum pump, the inner cavity of the interlayer cavities is connected with an air compressor, the vacuum pump vacuumizes the hermetically wrapped wood beams, the air compressor inflates and pressurizes the inner cavity of the interlayer cavities, a resistance-type heating plate is arranged in the inner cavity of the interlayer cavities, the air in the interlayer cavities is heated by electrifying, and then the wrapped wood beams are subjected to heat insulation at 40-60 ℃ in a heat conduction mode through the inner walls of the interlayer cavities.
Furthermore, the airtight processing container is assembled by adopting heat-insulating composite building materials or composite boards, and can be made of flame-retardant plywood, silicic acid boards, aluminum plastic boards and other general heat-insulating materials. The interlayer cavity is made of rubber or silica gel sheets with good elasticity and thermal insulation performance according to the size of the inner wall of the rectangular processing container, and the outer layer of the interlayer cavity is tightly attached to the inner wall of the processing container in a gluing or screw fastening mode.
The air compressor maintains the air pressure for inflating and pressurizing the inner cavity of the interlayer cavity at 1.1-1.3 Kgf/cm.
A vacuum drying method applied to wood balk wood is characterized in that:
A. firstly, preheating wood purlin wood to 50 ℃, neatly stacking the wood purlin wood on the bottom surface of a processing container, sealing the processing container, and completely covering and wrapping the wood purlin wood on the inner walls at the periphery and the upper part of the processing container by an interlayer cavity to form air tightness;
B. before a vacuum pump is started to carry out vacuumizing drying treatment on wood purlin, firstly, an air compressor is started to carry out positive pressure inflation on an expandable and contractible interlayer cavity, the air pressure is 1.1-1.3Kgf/cm, the interlayer cavity is fully inflated and expanded, all residual spaces between the inner wall of a processing container and the dried and processed wood purlin are filled, and the interlayer cavity is used as a buffer layer of air pressure difference in negative pressure type drying processing and can counteract one atmospheric pressure formed by external air on the outer wall of the processing container after the vacuum state is formed in the processing container;
C. and then starting a vacuum pump for reducing the gas phase temperature of the wood purlin, carrying out vacuum-pumping drying treatment, wherein in the process that the wood purlin gradually enters a vacuum state, the inner wall of the interlayer cavity slightly expands again, the air compressor needs to be started continuously for inflating and maintaining pressure, after the airtight space of the wood purlin wrapped by the interlayer cavity forms the vacuum state, a sensor and a temperature controller which are arranged on the inner cavity wall of the interlayer cavity start to work, the internal air temperature is maintained at 50 ℃, whether the resistance type heating plate is opened or closed is controlled according to the actually measured temperature of the air in the interlayer cavity lower than or higher than 50 ℃, and the moisture in the wood purlin is continuously gasified and pumped away.
The pressurized air in the interlayer cavity can be naturally convected, the air in the interlayer cavity is heated by the resistance heating plate, and the heat energy is transmitted to the outer side of the wood balk to be processed in a heat conduction mode through the inner wall of the interlayer cavity, so that the total temperature of the wood balk is kept higher than the gas phase temperature in a vacuum state.
The core of the technology is that a flexible expansion interlayer cavity is arranged between the inner wall of an airtight processing container and a wood balk material, the interlayer cavity is used as a buffer layer of air pressure difference during negative pressure type drying processing, so that the pressure of one atmosphere formed by external air on the outer wall of the processing container after the vacuum state is formed inside the processing container is offset, meanwhile, a resistance-type heating plate arranged on the inner wall of the interlayer cavity is used for carrying out temperature rise type heat preservation on the air inside the interlayer cavity in a heat convection mode under the control of a sensor and a temperature controller, generated heat energy is transmitted to the outer layer of the wood balk material through the inner wall of the interlayer cavity in a heat conduction mode, the physical index that the temperature of the wood balk material is higher than the water vapor phase temperature in the vacuum state is guaranteed to be maintained, the vacuum state of the wood balk material is caused by adopting a vacuum pumping mode, the gasification speed of moisture is accelerated in a mode by reducing the vapor phase temperature of the moisture, and the drying purpose of the wood balk material is finally achieved.
The invention has the advantages that: 1. the rectangular space inside the airtight processing container can be designed and manufactured into a shape space which is most suitable for square stacking of wood purlin, so that the proportion of the available space is increased to more than 80%. 2. Through the expandable interlayer cavity, the compression-resistant mode of the processing container is changed from inward deformation prevention to outward deformation prevention, and the compression-resistant requirement is reduced to the level of 0.2Kgf/cm, so that the manufacturing material and the manufacturing mode of the airtight processing container have great flexibility, and composite building materials and composite plates with low compression strength requirement can be used, for example, the airtight processing container can be made of flame-retardant plywood, silicate board, aluminum plastic plate and other general heat-insulating materials, so that the manufacturing cost is greatly reduced. 3. The interlayer cavity with the expansion and contraction performance is made of rubber or a silica gel sheet with better elasticity and heat preservation performance according to the size of the inner wall of the container, the manufacturing cost is low, and the maintenance or replacement cost is low. 4. The resistance heating plate, the temperature sensor and the temperature controller which are arranged on the inner cavity wall of the interlayer cavity are all conventional components, are easy to obtain and have low price. 5. Compared with the vacuum kettle type vacuum drying method, the invention can achieve the same processing purpose and effect, can reduce the manufacturing cost and the maintenance cost of the container while improving the processing volume ratio of the container by utilizing the rectangular space structure, has short drying time and less wood deformation, and can replace an expensive vacuum kettle.
Drawings
Fig. 1 is a schematic diagram of the space placement of a cylindrical vacuum kettle for vacuum drying wood purlin timber in the prior art.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic cross-sectional view of fig. 2.
Fig. 4 is an enlarged schematic view of the sandwich cavity.
Description of reference numerals: 1-processing container, 2-wood beam, 3-interlayer cavity, 31-inner cavity of interlayer cavity, 4-resistance heating plate, 5-temperature sensor, 6-temperature controller, 7-vacuum pump, 8-air compressor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail by referring to the following embodiments.
Referring to fig. 2 to 4, the vacuum drying apparatus of the present embodiment includes: the whole airtight processing container 1 that is cuboid structure, the intermediate layer cavity 3 that can flexibly expand and contract, resistance-type heating plate 4, temperature sensor 5, temperature controller 6, vacuum pump 7, air compressor 8. The airtight processing container 1 is formed by assembling heat-insulating aluminum-plastic plates, and the interlayer cavity 3 is made of rubber with good elasticity and heat-insulating property and corresponds to the size of the inner wall of the processing container 1.
The inner space of the processing container 1 is rectangular, a flexible expansion interlayer cavity 3 is arranged between the inner wall of the periphery of the processing container 1 except the bottom surface and the inner wall of the upper part of the processing container 1 and the dried wood square timber 2, the interlayer cavity 3 is divided into an outer layer and an inner layer, an inner cavity 31 is arranged between the inner layer and the outer layer, the outer layer of the interlayer cavity 3 is closely adhered to the inner wall of the processing container 1 without a gap, the interlayer cavity 3 is used as a buffer layer of air pressure difference during negative pressure type drying processing, and a gap of 0.1-0.2 m is generally reserved between the inner wall of the interlayer cavity 3 and the stacked wood square timber 2 before inflation and pressurization. After the processing container 1 is sealed, the inner layer of the interlayer cavity 3 hermetically wraps the wood purlin material 2, the sealed space of the interlayer cavity is connected with the vacuum pump 7, the inner cavity 31 of the interlayer cavity is connected with the air compressor 8, the vacuum pump 7 vacuumizes the hermetically wrapped wood purlin material 2, meanwhile, the air compressor 8 inflates and pressurizes the inner cavity 31 of the interlayer cavity, the resistance-type heating plate 4 is arranged on the inner wall of the inner cavity 31 of the interlayer cavity, the resistance-type heating plate is electrified to heat gas in the inner cavity 31 of the interlayer cavity, and then the heat insulation of the wood purlin material 2 at 40-60 ℃ is carried out in a heat conduction mode through the inner wall of the interlayer cavity 3.
The drying method comprises the following steps: firstly, preheating wood purlin materials 2 to 50 ℃, when a vacuum drying device is in a standby state, an expandable and contractible interlayer cavity 3 is in a contraction state without positive pressure, stacking the wood purlin materials 2 to be dried in a processing container 1, immediately starting an air compressor 8 after the wood purlin materials are properly stacked, inflating the interior of the interlayer cavity 3, and enabling the air pressure in the interlayer cavity 3 to reach 1.2Kgf/cm and be in an extension state along with the increase of air pressure, wherein the interlayer cavity 3 is filled with all residual spaces between the inner wall of the processing container and the dried and processed wood purlin materials. The vacuum pump 7 is started immediately, the sealed space is vacuumized, the wrapped sealed wood balk 2 is gradually in a vacuum state, the gas phase temperature of the moisture in the sealed space is reduced from 100 ℃ under normal pressure to about 35 ℃ in the vacuum state, and the moisture in the wood balk 2 which is preheated to 50 ℃ is gasified and discharged.
In order to keep the wood beam 2 at the processing temperature of 50 ℃, the resistance heating plate 4 is started, the temperature sensor 5 is responsible for transmitting the temperature information of the inner cavity 31 of the interlayer cavity to the temperature controller 6 through a signal wire, and the temperature controller is responsible for controlling the opening and closing of the resistance heating plate 4.
It should be understood that the application of the patent is not limited to the examples described above, and that equivalent modifications or changes can be made by those skilled in the art according to the above description, and all such equivalent modifications and changes should fall within the scope of the claims of the present patent, which are not described herein again.
Claims (5)
1. A vacuum drying device applied to wood purlin timber comprises: place wooden santalum album processing container, produce vacuum negative pressure's vacuum pump, produce the air compressor of malleation, produce thermal resistance-type generate heat the board and detect air temperature's sensor and temperature controller, its characterized in that: the processing container capable of being airtight is made of heat-insulating materials, the internal space of the processing container is rectangular, wood balk is placed on the bottom surface of the processing container, interlayer cavities capable of expanding and contracting flexibly are arranged on the inner walls of the periphery and the inner wall of the upper portion of the processing container, the interlayer cavities are divided into an outer layer and an inner layer, an inner cavity is arranged between the inner layer and the outer layer, the outer layer of each interlayer cavity and the inner wall of the processing container are tightly attached and combined without gaps, each interlayer cavity serves as a buffer layer of air pressure difference during negative-pressure drying processing, the inner layer of each interlayer cavity hermetically wraps the wood balk placed on the bottom surface of the processing container, the airtight space of each interlayer cavity is connected with a vacuum pump, the inner cavity of each interlayer cavity is connected with an air compressor, the vacuum pump vacuumizes the hermetically wrapped wood balk, the air compressor inflates and pressurizes the inner cavity of each interlayer cavity, a resistance-type heating plate is arranged in the inner cavity of each interlayer cavity, electricity is electrified to heat the air in the inner cavity of the interlayer cavities, and then the wrapped wood balk is subjected to heat insulation at 40-60 ℃ in a heat conduction mode through the inner walls of the interlayer cavities.
2. The vacuum drying device according to claim 1, wherein the airtight processing container is assembled by using heat-insulating composite building materials or composite boards, the interlayer cavity is made of rubber or silica gel sheets with good elasticity and heat-insulating property according to the size of the inner wall of the rectangular processing container, and the outer layer of the interlayer cavity is tightly attached to the inner wall of the processing container in a gluing or screw fastening manner.
3. Vacuum drying apparatus according to claim 1 or 2, wherein the air pressure at which the air compressor inflates and pressurizes the interlayer cavity inner chamber is maintained at 1.1-1.3 Kgf/cm.
4. The vacuum drying method according to claim 1, characterized in that:
A. firstly, preheating wood purlin timber to 50 ℃, neatly stacking the wood purlin timber on the bottom surface of a processing container, sealing the processing container, and completely covering and wrapping the wood purlin timber on the inner walls at the periphery and the inner wall at the upper part of the processing container by an interlayer cavity to form gas seal;
B. before a vacuum pump is started to carry out vacuumizing drying treatment on wood purlin, firstly, an air compressor is started to carry out positive pressure inflation on an expandable and contractible interlayer cavity, the air pressure is 1.1-1.3Kgf/cm, the interlayer cavity is fully inflated and expanded, all residual spaces between the inner wall of a processing container and the dried and processed wood purlin are filled with the inner layer of the interlayer cavity, the interlayer cavity is used as a buffer layer of air pressure difference during negative pressure type drying processing, and the pressure of one atmospheric pressure formed by external air normal pressure on the outer wall of the processing container after the vacuum state is formed in the processing container can be offset;
C. and then starting a vacuum pump for reducing the gas phase temperature of the wood purlin, carrying out vacuum-pumping drying treatment, wherein in the process that the wood purlin gradually enters a vacuum state, the inner wall of the interlayer cavity slightly expands again, the air compressor needs to be started continuously for inflating and maintaining pressure, after the airtight space of the wood purlin wrapped by the interlayer cavity forms the vacuum state, a sensor and a temperature controller which are arranged on the inner cavity wall of the interlayer cavity start to work, the internal air temperature is maintained at 50 ℃, whether the resistance type heating plate is opened or closed is controlled according to the actually measured temperature of the air in the interlayer cavity lower than or higher than 50 ℃, and the moisture in the wood purlin is continuously gasified and pumped away.
5. The vacuum drying method according to claim 4, wherein the pressurized air in the cavity of the interlayer cavity can be naturally convected, the air in the cavity of the interlayer cavity is heated by the resistance heating plate, and the heat energy is transferred to the outer side of the wood balk to be processed through the inner wall of the interlayer cavity in a heat conduction manner, so that the total temperature of the wood balk is kept higher than the gas phase temperature in the vacuum state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211423129.4A CN115751848A (en) | 2022-11-15 | 2022-11-15 | Vacuum drying device applied to wood santalum album and drying method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211423129.4A CN115751848A (en) | 2022-11-15 | 2022-11-15 | Vacuum drying device applied to wood santalum album and drying method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115751848A true CN115751848A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211423129.4A Pending CN115751848A (en) | 2022-11-15 | 2022-11-15 | Vacuum drying device applied to wood santalum album and drying method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115751848A (en) |
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- 2022-11-15 CN CN202211423129.4A patent/CN115751848A/en active Pending
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