CN109595887B - Large-thickness high-density solid wood drying method - Google Patents
Large-thickness high-density solid wood drying method Download PDFInfo
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- CN109595887B CN109595887B CN201811520836.9A CN201811520836A CN109595887B CN 109595887 B CN109595887 B CN 109595887B CN 201811520836 A CN201811520836 A CN 201811520836A CN 109595887 B CN109595887 B CN 109595887B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
- F26B2210/16—Wood, e.g. lumber, timber
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- General Engineering & Computer Science (AREA)
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Abstract
The application discloses a drying method for large-thickness high-density solid wood, which at least comprises the following steps: step 1, heating the temperature of the areas at the two ends in the length direction of the heating plate to 32 +/-2 ℃, heating the temperature of the area in the middle in the length direction of the heating plate to 37 +/-2 ℃, and keeping the relative humidity of 76-81% RH in the vacuum tank; step 2, when the water content of the plate is reduced to 20 percent and mc is less than or equal to 24 percent, heating the temperature of the two end areas in the length direction of the heating plate to 39 +/-2 ℃, heating the temperature of the middle area in the length direction of the heating plate to 44 +/-2 ℃, and keeping the relative humidity in the vacuum tank to be 73-78 percent RH; and 3, when the water content of the plate is reduced to 18 percent and mc is less than or equal to 20 percent, heating the temperature of the areas at the two ends in the length direction of the heating plate to 47 +/-2 ℃, heating the temperature of the area in the middle in the length direction of the heating plate to 51 +/-2 ℃, and keeping the relative humidity in the vacuum tank to be 68-70 percent RH. Has the advantages of high drying efficiency and good drying quality.
Description
Technical Field
The application relates to the technical field of wood drying, in particular to a drying method for a solid wood material with large thickness and high density.
Background
In the manufacturing of the solid wood furniture, solid wood blanks with larger thickness and higher density are mostly adopted, specifically, the thickness is about 70-120 mm, and the density is about 0.7-1.1 g/cm3Such as rosewood. The high-density material also has the characteristic of high initial water content (20-30%), so that the wood with high density, large thickness and high water content is difficult to dry.
The existing drying treatment method of the high-density solid wood material needs to carry out the steps of normal-pressure high-temperature cooking, high-pressure steam, high-temperature high-frequency vacuum drying, low-temperature drying and the like, and the total time consumption is about 3 months. For example, the method for treating the redwood disclosed in the chinese patent CN 106938486B comprises the steps of water boiling, primary cooling oil infiltration, primary air steaming, secondary cooling oil infiltration, secondary air steaming, tertiary cooling, vacuum high-frequency drying and constant-temperature drying, and the time consumption reaches 60-107 days. According to the technical scheme, although the drying of the rosewood material can be well completed, the water content is controlled to be 10% -16%, and the problem that the rosewood material is cracked in the using process is well solved. However, the drying period of the technical scheme is too long, so that the problems of low equipment utilization rate and large enterprise capital occupation are brought.
Another processing method, for example, a vacuum drying machine for redwood disclosed in chinese patent CN 203534073U, is to arrange a heating pipe, a fan, etc. in a vacuum drying tank, so that the material to be dried is heated in a vacuum environment and is rapidly dried under the driving of a high-speed airflow. However, the above problems have the technical problem of poor drying effect, firstly, the moisture channel in the high-density material is blocked, and the blockage of the channel is difficult to break in the natural hot air drying process, so that the drying is not uniform; secondly, the initial moisture content of the rosewood material is high, and although the air flow rate can be weakened in a negative pressure environment, the problem of cracking of the material can be caused by the combination of rapid heating and air flow.
Disclosure of Invention
The technical purpose of the invention is to overcome the problems of uneven drying, cracking and overlong drying period in the prior art, thereby aiming at the solid wood material with large thickness and high density (the thickness is 70-120 mm, and the density is 0.7-1.1 g/cm)3) The drying method reduces drying cracking and greatly shortens the drying period.
The embodiment of the invention discloses a method for drying large-thickness high-density solid wood, which at least comprises the following steps:
and 7, reducing the temperature of the heating plate to 25 +/-2 ℃, recovering the normal pressure in the vacuum tank, opening the upper heating plate and the lower heating plate, and unloading the plate.
By means of the process method, the traditional drying method combining contact heating drying and vacuum drying is improved, so that the temperature of the middle area of the heating plate is higher than the temperatures of the two end areas, the temperature of the middle area of the board to be dried in the length direction is higher than the temperatures of the two end areas, larger water vapor pressure is formed in the middle area of the board in the length direction, the combination end (and the near end area) firstly discharges water to the outside, and the water vapor pressure difference in the water channel path is further increased. Meanwhile, when the outside is in a negative pressure state, the moisture is driven to migrate from the starting end to the tail end of the moisture channel path by a large water vapor pressure difference and is finally discharged to the outside.
Preferably, the temperature of the central region in the longitudinal direction of the heating plate is gradually decreased to the temperature of the end regions in the longitudinal direction of the heating plate.
Preferably, the temperature of the central area of the heating plate in the length direction is reduced by 1-2.5 ℃ per meter to the temperature of the end area of the heating plate in the length direction.
Preferably, the central region of the heating plate in the longitudinal direction is a region in which the central region of the heating plate in the longitudinal direction occupies 25 to 30% of the entire length of the heating plate.
Preferably, when the thickness of the plate is 70-90 mm, in the step 1, the vacuum degree in the vacuum tank is set to-0.063-0.060 MPa; and in the step 4, after the heating plate reaches the set temperature, setting the vacuum degree in the vacuum tank to be-0.070 to-0.067 MPa.
Preferably, when the thickness of the plate is 90-120 mm, in the step 1, the vacuum degree in the vacuum tank is set to-0.055-0.050 MPa; and in the step 4, after the heating plate reaches the set temperature, setting the vacuum degree in the vacuum tank to be-0.065 to-0.060 MPa.
Preferably, in the steps 5 and 6, a slit-type air flow channel is formed between the plate material and the heating plate, and the width of the air flow channel increases as the water content of the plate material decreases.
Preferably, the air flow path is formed between the plate and the upper and lower heating plates.
Preferably, in the step 5, a fan is turned on, and an airflow velocity of 0.5-1.5 m/s is formed in the vacuum tank; the fan is located the top of vacuum tank, and the top of vacuum tank the both sides of fan are provided with the guide plate, the water conservancy diversion face orientation of guide plate panel one side sets up.
Preferably, in the step 7, the rotation speed of the fan is reduced with the pressure in the vacuum tank being recovered, and the flow velocity of the air flow in the vacuum tank is maintained at 3 to 5 m/s.
Preferably, in the step 7, saturated steam is sprayed into the vacuum tank when the pressure in the vacuum tank is restored to-0.010 to-0.005 MPa.
By means of the process method, the traditional drying method combining contact heating drying and vacuum drying is improved, so that the temperature of the middle area of the heating plate is higher than that of the two end areas, and the temperature of the middle area of the plate to be dried in the length direction is higher than that of the two end areas. The middle area is high in temperature, the two ends are low in temperature, the temperature gradient and the water content gradient from inside to outside can be generated in the length direction of the thick plate, the middle area in the length direction of the thick plate is formed with larger water vapor pressure, the end (and the near end area) is combined to discharge water to the outside, and the water vapor pressure difference in the water channel path is further increased. Meanwhile, when the outside is in a negative pressure state, the moisture is driven to migrate from the starting end to the tail end of the moisture channel path by the large water vapor pressure difference and is finally discharged to the outside, so that the internal moisture is accelerated to be discharged to the outside. And further, through the formation of the airflow channel, more moisture discharge paths are formed in the later drying period, and the drying speed is further accelerated. On the other hand, the formation and the expansion of the air flow channel are synchronously formed by matching with the reduction of the water content of the material, so that the width of the air flow channel is always consistent with the current water content of the plate, manual monitoring is not needed, and the phenomenon that the air flow channel is too large or too small relative to the instant water content can be effectively avoided.
Therefore, the drying method for the large-thickness high-density solid wood at least has the following advantages:
(1) the drying period is short, and can be reduced from at least 60 days to about 30 days;
(2) the drying quality is good, the problem of drying cracking can be relatively effectively reduced, compared with the drying process which consumes similar drying time in the prior art, the drying cracking rate is reduced from about 20 percent to about 3 percent, and other drying problems such as shrinkage, deformation and the like are avoided.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Drawings
Fig. 1 is a schematic view of a vacuum tank used in a method for drying high-density solid wood with large thickness in example 1 of the present invention.
Figure 2 is a schematic view of the heating panel of figure 1.
Fig. 3 is a partially enlarged view of fig. 2.
In the drawings: 1-a vacuum tank, 2-a heating plate, 3-an airflow channel, 4-a fan, 5-a guide plate and 6-a bow spring.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1: in this embodiment, the board to be dried has a thickness of 75mm and a density of 0.85g/cm3And the initial water content is 30-35%, and the adopted equipment schematic diagram is shown in figure 1.
A drying method for large-thickness high-density solid wood comprises the following steps:
and 7, reducing the temperature of the heating plate 2 to 25 +/-2 ℃, recovering the normal pressure in the vacuum tank 1, opening the upper heating plate 2 and the lower heating plate 2, unloading the plate and finishing drying.
Since the contact heating requires the heating plate to be in complete contact with the upper and lower surfaces of the board to be dried, during the drying process, the moisture inside the board can only move in the moisture channel in the length direction and is discharged to the outside from the two ends of the board, and the power of the movement is mainly the low outside and high inside water vapor partial pressure inside the board. In the conventional contact heating drying, the uniform heating is adopted, when the moisture at the end (and the near end part area) is discharged to the outside, the partial pressure of the water vapor with the lower outside and the higher inside is formed, and the driving force for the moisture to migrate from the inside of the plate to the outside is formed by the temperature difference between the higher outside and the lower inside, which is formed by the slower temperature rise of the core layer than that of the surface layer. However, the moisture channels inside the high-density board are relatively blocked, and the power required for completing the moisture migration is larger, so the generated driving force is not enough to make the moisture inside the board rapidly, smoothly and sufficiently migrate, and the problem that the drying of the high-density and large-thickness material is difficult is mainly caused.
By means of the process method, the traditional drying method combining contact heating drying and vacuum drying is improved, so that the temperature of the middle area of the heating plate is higher than the temperatures of the two end areas, the temperature of the middle area of the board to be dried in the length direction is higher than the temperatures of the two end areas, larger water vapor pressure is formed in the middle area of the board in the length direction, the combination end (and the near end area) firstly discharges water to the outside, and the water vapor pressure difference in the water channel path is further increased. Meanwhile, when the outside is in a negative pressure state, the moisture is driven to migrate from the starting end to the tail end of the moisture channel path by a large water vapor pressure difference and is finally discharged to the outside.
Further, the heating of the heating plate is divided into five stages, and in the early stage of drying, the lower temperature of the heating plate is adopted and the lower vacuum degree is matched, so that the moisture in the plate is preliminarily removed in a relatively soft mode, and the water vapor pressure difference is gradually formed in the process that the temperature in the thickness direction of the plate tends to be consistent. In the middle stage of drying, the temperature of the heating plate is increased, the pressure difference of water vapor inside the plate is gradually increased, and meanwhile, the negative pressure in the vacuum tank is increased, so that the opening of a moisture channel is promoted. In the later stage of drying, the temperature is raised, the relative humidity in the vacuum tank is reduced, and the drying speed is accelerated.
In the foregoing, the central region in the longitudinal direction of the heating plate 2 is a region in which the central region in the longitudinal direction of the heating plate 2 occupies 25 to 30% of the entire length of the heating plate 2. The temperature of the central region in the length direction of the heating plate 2 gradually decreases to the temperature of the end regions in the length direction of the heating plate 2.
The implementation mode can be realized by improving the existing heating plate. Referring to fig. 2, the heating plate 2 is a heat conduction oil heating type heating plate, the heating plate 2 is divided into three heat conduction oil chambers along the length direction thereof, and the three heat conduction oil chambers include a middle heat conduction oil chamber located in a middle area and end heat conduction oil chambers located at both sides, and the middle heat conduction oil chamber and the end heat conduction oil chambers are connected with two heat conduction oil tanks. In the treatment process, heat conduction oil with different temperatures is introduced into the three heat conduction oil cavities, so that the temperature of the middle area of the heating plate 2 in the length direction is higher than that of the end area of the heating plate 2 in the length direction. Meanwhile, the middle heat conduction oil cavity and the end heat conduction oil cavity are separated by a metal plate, and the temperatures of the two heat conduction oil cavities are mutually influenced, so that the temperature of the middle area in the length direction of the heating plate 2 is gradually reduced to the temperature of the end area in the length direction of the heating plate 2. The advantage of setting up like this is, can effectively avoid the impression that appears in the panel middle part that the temperature difference of broken layer type arouses. Possible operating methods are, for example:
Further preferably, in the steps 5 and 6, a slit-type air flow path 3 is formed between the plate material and the heating plate 2, and the width of the air flow path 3 increases as the water content of the plate material decreases.
It is well known that as the moisture content of the board decreases, a reduction in size, i.e., a reduction in thickness and width, occurs, and as the thickness of the dried board increases, the amount of shrinkage increases. When the thickness of the dried plate is 70-120 mm and the plate is made of high-density material, the plate is dried from the water content of 30-35% to the water content of 10-12%, and the size of the plate in the thickness direction is reduced by about 2-3 mm. In the prior art, in order to keep the heating plate 2 to be attached to the surface of the plate all the time, a pressurizing structure is added, specifically, the heating plate 2 on the upper side or the heating plate 2 on the lower side is connected to a hydraulic oil cylinder, and the heating plate 2 is attached to the surface of the plate all the time through monitoring and signal transmission of a pressure sensor or other induction elements. This is done to ensure the effectiveness of the heating.
However, although the above technical solution ensures the heat transfer efficiency of the heating plate, it is unfavorable for drying the plate at the later stage of drying. The reduction of the plate size is formed simultaneously with the reduction of the water content, and the influence of the gap less than 1mm in the previous period on the heat conduction efficiency is small. When the gap exceeds 1mm, and the temperature in the thickness direction of the plate has reached a uniform temperature and the temperature in the length direction and the temperature difference have reached the set temperature, the gap between the heating panel 2 and the plate does not cause the temperature unevenness inside the plate. Meanwhile, the moisture content of the plate is reduced to 16-18%, and in the later drying stage, a drying mode of contact heating is still adopted, so that the moisture discharge path in the plate is too single, and the drying speed is not improved. In this technical scheme, when the drying is carried out to the dry later stage, through the natural size reduction of panel and form the air current passageway of slot formula, can increase the discharge route of moisture in the panel, the problem that the moisture migration power that the reduction of vapor pressure difference leads to is not enough when airtight low moisture content to improve the drying rate in dry later stage.
As a further preference, in the steps 5 and 6, a gap type air flow channel 3 is formed between the plate and the upper heating plate 2 and the lower heating plate 2. This has the advantage of further increasing the moisture egress path. The air flow path 3 of the plate and the upper heating plate 2 can be naturally formed by a reduced scale, and the air flow path 3 of the plate and the lower heating plate 2 can be illustrated by combining the heating plates 2 shown in fig. 2 and 3. A pair of sliding grooves are formed in the lower heating plate 2 (relative to the lower heating plate 2 of one plate), an arch spring 6 is clamped in the sliding grooves, the maximum extending amount (relative to the upper surface of the lower heating plate 2) of the arch spring 6 is 2mm, when the water content of the plate is large, the arch spring 6 is pressed, and the plate is loaded on the upper surface of the lower heating plate 2; when the water content of the plate material is reduced, the bow spring 6 is pressed to jack the plate material upwards, and the contact surface of the bow spring and the plate material is the bearing surface of the plate material. The reduced sizes of the sheet materials are combined to form the air flow passages 3 on both the upper and lower surfaces of the sheet materials. Generally, the number of the large bow springs 6 is 6-8 per square plate.
As a further preference, in the step 5, the fan 4 is turned on to form an airflow velocity of 0.5-1.5 m/s in the vacuum tank 1; the fan 4 is located the top of the vacuum tank 1, the guide plates 5 are arranged on the top of the vacuum tank 1 and on two sides of the fan 4, and the guide surfaces of the guide plates 5 face one side of the plate. In the step 7, along with the pressure recovery in the vacuum tank 1, the rotating speed of the fan 4 is reduced, and the airflow velocity of 3-5 m/s is kept in the vacuum tank 1.
Further preferably, in the step 7, saturated steam is sprayed into the vacuum tank 1 when the pressure in the vacuum tank 1 is restored to-0.010 to-0.005 MPa. When the pressure in the vacuum tank 1 is restored, saturated water vapor is sucked back into the sheet material, specifically, the proximal end portion region, the surface region of the sheet material, during the pressure restoration. The moisture content of the surface of the plate and the moisture content of the near-end part region are often lower than that of the core part, so that the surface of the plate and the moisture content of the near-end part region and the moisture content of the core part tend to be consistent with each other by maintaining balance in a constant-temperature environment after drying is completed. In this technical scheme, through the suck-back of vapor, compensatied the moisture content of panel surface, near end region, the two of quick messenger reaches unanimity to can save the long health preserving equilibrium stage consuming time.
Example 2: example 2 is different from example 1 in that the thickness of the plate material is 100mm, and in the step 1, the degree of vacuum in the vacuum tank 1 is set to-0.055 MPa; and in the step 4, after the heating plate 2 reaches the set temperature, the vacuum degree in the vacuum tank 1 is set to-0.060 MPa.
Example 3: example 3 is different from example 1 in that the thickness of the plate material is 120mm, the thickness of the plate material is 100mm, and the degree of vacuum in the vacuum tank 1 is set to-0.055 MPa in the step 1; and in the step 4, after the heating plate 2 reaches the set temperature, the vacuum degree in the vacuum tank 1 is set to-0.065 MPa.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The drying method of the large-thickness high-density solid wood is characterized by at least comprising the following steps:
step 1, placing a plate to be dried between two layers of heating plates (2) in a vacuum tank (1), closing the heating plates (2) at the upper part and the lower part until the heating plates are in no pressure contact with the upper surface and the lower surface of the plate to be dried, and enabling the interior of the vacuum tank (1) to be in a negative pressure environment of-0.07 to-0.05 MPa;
step 2, heating the temperature of the two end regions in the length direction of the heating plate (2) to 32 +/-2 ℃, heating the temperature of the middle region in the length direction of the heating plate (2) to 37 +/-2 ℃, and keeping the relative humidity of 76-81% RH in the vacuum tank (1);
step 3, when the water content of the plate is reduced to 20 percent and mc is less than or equal to 24 percent, heating the temperature of the two end areas in the length direction of the heating plate (2) to 39 +/-2 ℃, heating the temperature of the middle area in the length direction of the heating plate (2) to 44 +/-2 ℃, and keeping the relative humidity of 73-78 percent RH in the vacuum tank (1);
step 4, when the water content of the plate is reduced to 18 percent and mc is less than or equal to 20 percent, heating the temperature of the two end areas in the length direction of the heating plate (2) to 47 +/-2 ℃, heating the temperature of the middle area in the length direction of the heating plate (2) to 51 +/-2 ℃, and keeping the relative humidity of 68-70 percent RH in the vacuum tank (1);
step 5, when the water content of the plate is reduced to 16 percent and mc is less than or equal to 18 percent, heating the temperature of the two end areas in the length direction of the heating plate (2) to 53 +/-2 ℃, heating the temperature of the middle area in the length direction of the heating plate (2) to 57 +/-2 ℃, and keeping the relative humidity of 64-66 percent RH in the vacuum tank (1);
step 6, when the water content of the plate is reduced to mc less than or equal to 16%, heating the temperature of the two end areas in the length direction of the heating plate (2) to 58 +/-2 ℃, heating the temperature of the middle area in the length direction of the heating plate (2) to 61 +/-2 ℃, and keeping the relative humidity of 60-62% RH in the vacuum tank (1);
and 7, reducing the temperature of the heating plate (2) to 25 +/-2 ℃, restoring the normal pressure in the vacuum tank (1), opening the heating plate (2) at the upper part and the lower part, unloading the plate and finishing drying.
2. A method for drying high-density solid wood with large thickness according to claim 1, characterized in that the central area of the heating plate (2) in the length direction is the area of the central area of the heating plate (2) in the length direction accounting for 25-30% of the total length of the heating plate (2); the temperature of the middle area of the heating plate (2) in the length direction is gradually decreased to the temperature of the end area of the heating plate (2) in the length direction.
3. A method for drying solid wood with large thickness and high density according to claim 2, characterized in that the temperature of the heating plate (2) in the middle area along the length direction is reduced by 1-2.5 ℃ per meter to the temperature of the heating plate (2) in the end area along the length direction.
4. The method for drying the large-thickness high-density solid wood according to claim 1, wherein when the thickness of the board is 70-90 mm, in the step 1, the vacuum degree in the vacuum tank (1) is set to-0.063-0.060 MPa; and in the step 4, after the heating plate (2) reaches the set temperature, setting the vacuum degree in the vacuum tank (1) to be-0.070 to-0.067 MPa.
5. The drying method for the large-thickness high-density solid wood according to claim 1, wherein when the thickness of the board is 90-120 mm, in the step 1, the vacuum degree in the vacuum tank (1) is set to-0.055-0.050 MPa; and in the step 4, after the heating plate (2) reaches the set temperature, setting the vacuum degree in the vacuum tank (1) to be-0.065 to-0.060 MPa.
6. A method for drying high-density solid wood with large thickness according to claim 1, characterized in that in the steps 5 and 6, a gap type air flow channel (3) is formed between the board and the heating plate (2), and the width of the air flow channel (3) is increased along with the reduction of the water content of the board.
7. A method for drying high-density solid wood with large thickness according to claim 6, characterized in that said air flow channel (3) is formed between the board and the upper heating plate (2) and the lower heating plate (2).
8. A method for drying high-density solid wood with large thickness according to claim 6 or 7, characterized in that in the step 5, a fan (4) is turned on to form an air flow velocity of 0.5-1.5 m/s in the vacuum tank (1); the fan (4) is located at the top of the vacuum tank (1), guide plates (5) are arranged at the top of the vacuum tank (1) and on two sides of the fan (4), and the guide surface of each guide plate (5) faces towards one side of the plate.
9. A method for drying high-density solid wood with large thickness according to claim 8, characterized in that in the step 7, the rotation speed of the fan (4) is reduced along with the pressure recovery in the vacuum tank (1), and the air flow velocity in the vacuum tank (1) is kept to be 3-5 m/s.
10. The method for drying the large-thickness high-density solid wood according to claim 1, wherein in the step 7, when the pressure in the vacuum tank (1) is recovered to-0.010 to-0.005 MPa, saturated water vapor is sprayed into the vacuum tank (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2436899Y (en) * | 2000-08-21 | 2001-06-27 | 边新虎 | Timber vacuum dry box |
| US20120160835A1 (en) * | 2010-12-23 | 2012-06-28 | Eastman Chemical Company | Wood heater with enhanced microwave barrier system |
| CN202101515U (en) * | 2011-05-13 | 2012-01-04 | 开原圣意达木材干燥设备有限公司 | Pressing plate type vacuum drying equipment for wood |
| JP6194923B2 (en) * | 2015-06-01 | 2017-09-13 | 三菱電機株式会社 | Vacuum freeze dryer |
| CN106482456A (en) * | 2015-08-31 | 2017-03-08 | 黄备恩 | A kind of drying means of furniture wood slab raw materials |
| CN206527851U (en) * | 2016-11-08 | 2017-09-29 | 宜华生活科技股份有限公司 | The drying of wood and carbonization integrated equipment for wastewater treatment are carried out under vacuum condition |
| CN107042569A (en) * | 2017-05-18 | 2017-08-15 | 孔晓静 | A kind of processing method of floor heating solid wooden floor board |
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Denomination of invention: A drying method of large thickness and high density solid wood Effective date of registration: 20211230 Granted publication date: 20200417 Pledgee: Agricultural Bank of China Limited Shunde Xingtan sub branch Pledgor: GUANGDONG YUESHENGHUO HOME TECHNOLOGY Co.,Ltd. Registration number: Y2021980017171 |
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