WO2005100891A1 - マイクロ波を用いた減圧乾燥方法及びその装置 - Google Patents
マイクロ波を用いた減圧乾燥方法及びその装置 Download PDFInfo
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- WO2005100891A1 WO2005100891A1 PCT/JP2005/007042 JP2005007042W WO2005100891A1 WO 2005100891 A1 WO2005100891 A1 WO 2005100891A1 JP 2005007042 W JP2005007042 W JP 2005007042W WO 2005100891 A1 WO2005100891 A1 WO 2005100891A1
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- chamber
- microwave
- pressure
- temperature
- drying
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/40—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by drying or kilning; Subsequent reconstitution
- A23L3/54—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by drying or kilning; Subsequent reconstitution using irradiation or electrical treatment, e.g. ultrasonic waves
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B4/00—General methods for preserving meat, sausages, fish or fish products
- A23B4/015—Preserving by irradiation or electric treatment without heating effect
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B4/00—General methods for preserving meat, sausages, fish or fish products
- A23B4/03—Drying; Subsequent reconstitution
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B7/00—Preservation or chemical ripening of fruit or vegetables
- A23B7/015—Preserving by irradiation or electric treatment without heating effect
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L17/00—Food-from-the-sea products; Fish products; Fish meal; Fish-egg substitutes; Preparation or treatment thereof
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/40—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by drying or kilning; Subsequent reconstitution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
- F26B15/02—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle
- F26B15/04—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle in a horizontal plane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
- F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
- F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
- F26B15/14—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by trays or racks or receptacles, which may be connected to endless chains or belts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/343—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects in combination with convection
-
- 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
-
- 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
- F26B5/048—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 in combination with heat developed by electro-magnetic means, e.g. microwave energy
Definitions
- the present invention relates to a method and apparatus for drying under reduced pressure by irradiating a microwave to an object that undergoes deterioration (in addition to substantially changing components as well as deformation, etc.) depending on temperature.
- the present invention has been made in view of powerful circumstances, and has been developed at a low temperature and a short time at which the object is not deteriorated.
- An object of the present invention is to provide a reduced-pressure drying method using a microwave that can be dried in between, and a device therefor.
- a reduced pressure drying method using a microwave according to the present invention comprises placing an object in a chamber to which a vacuum pump is connected, and applying a microwave to the object in a reduced pressure state in the chamber.
- a vacuum drying method performed by irradiating, a ) reducing the pressure in the chamber 1 to not more than a saturated vapor pressure corresponding to the transformation temperature of the object; b) external force of the chamber 1 gas in the chamber 1 C)
- the microwave is turned on and off, and the object is dried while the temperature of the object is maintained at a temperature lower than the alteration temperature of the object.
- a reduced-pressure drying apparatus using a microwave which meets the above object, comprises: a chamber for receiving an object; a decompression pump connected to the chamber to reduce the pressure in the chamber; Microwave irradiation means for irradiating the object with microwaves, gas supply means for supplying gas into the chamber 1 from outside the chamber 1 to generate an air flow in the chamber 1, and the microwave Control means for irradiating the microwave with a predetermined period from the microwave irradiating means and performing on / off processing of the microwave so that the temperature of the object becomes lower than the altered temperature of the object.
- FIG. 1 is an explanatory view of a reduced-pressure drying apparatus using microwaves according to a first embodiment of the present invention.
- FIG. 2 is an explanatory view of a main part of the reduced-pressure drying apparatus.
- FIG. 3 is an explanatory diagram of a vacuum drying apparatus using microwaves according to a second embodiment of the present invention.
- FIG. 4 is an explanatory view of a vacuum drying apparatus using microwaves according to a modification of the second embodiment of the present invention.
- FIG. 5 is an explanatory view of a vacuum drying apparatus using microwaves according to a third embodiment of the present invention.
- FIG. 6 is a cross-sectional view showing a device arrangement around a tray with a cover in a decompression start station, a microwave heating station, and a pressure recovery station.
- FIG. 7 is a partial plan sectional view of a tray with a lid.
- FIG. 8 is a layout view of trays with lids of the vacuum drying apparatus.
- FIG. 9 is an explanatory view of a reduced-pressure drying apparatus using microwaves according to a modification of the third embodiment of the present invention.
- FIG. 10 are a front sectional view and a side sectional view showing a device arrangement around a tray with a lid in a decompression start station, a microwave heating station, and a recompression station, respectively.
- FIG. 11 is an explanatory view of a reduced-pressure drying apparatus using microwaves according to a further modification of the third embodiment of the present invention.
- FIG. 12 is an explanatory diagram of a vacuum drying apparatus using microwaves according to a fourth embodiment of the present invention.
- FIG. 13 is a graph showing a relationship between a drying time and a moisture content of an object due to a difference in pressure in a chamber in a vacuum drying apparatus using microwaves.
- FIG. 14 is a graph showing the relationship between the drying time and the water content of the object depending on the difference in the amount of gas supplied into the chamber.
- FIG. 15 is a graph showing a relationship between a drying time by a microwave irradiation method and a water content of an object.
- FIG. 16 is a graph showing the relationship between the drying time by microwave drying and hot air drying and the water content of the object.
- FIG. 17] (A) and (B) are graphs showing the moisture content distribution from the surface to the inside of the object dried in Test Example (microwave drying) and Comparative Example (warm air drying), respectively.
- FIG. 18 (A) and (B) are explanatory diagrams showing the surface texture before and after drying of an object dried using microwaves, respectively, and (C) is the surface of the object after drying in a comparative example. It is an explanatory view showing an organization.
- FIGS. 1 and 2 a reduced-pressure drying apparatus 10 using microwaves according to a first embodiment of the present invention will be described.
- the reduced-pressure drying device 10 includes a microwave oven 12 which is an example of a microphone mouth wave irradiation means for irradiating a microwave to a target (for example, a scallops).
- a microwave oven 12 which is an example of a microphone mouth wave irradiation means for irradiating a microwave to a target (for example, a scallops).
- a chamber 13 for receiving the object 11 is arranged.
- the chamber 13 is composed of a sheet glass 14 and a bell-shaped glass container 15 placed on the sheet glass 14, and the chamber 13 is closed by reducing the pressure in the chamber 13.
- an insulator may be used for washed clothes, wood, glass having a liquid crystal vapor-deposited film on the surface, an electronic board on which the washed electronic components are mounted, or an electronic component such as a capacitor.
- An article that is deformed by heat, such as paper used, can also be used.
- the degeneration temperature of a garment is the temperature at which the garment fabric is damaged or shrinks.
- the alteration temperature is the temperature at which cracks and distortions occur in the wood and glass
- the alteration temperature of the electronic board is the temperature at which electronic components are broken or the electronic board is deformed.
- Degradation temperature is the temperature at which paper deforms.
- this vacuum drying device 10 it is possible to dry sludge such as sewage sludge and livestock excreta, and paint after coating without causing deterioration (destruction of composition, scorching) and deformation.
- the microwave oven 12 can generate a microwave having a frequency of 2450 MHz (2.45 GHz) by a magnetron (not shown) which is an example of a microwave generating element installed in the microwave oven 12.
- Microwaves are a general term for electromagnetic waves with wavelengths ranging from about l to 30 cm and frequencies ranging from 1000 MHz to 30 GHz, and are important for studying the molecular structure of substances, as well as being used for relays, telephones, and television relays. It has the property of permeating glass, paper, etc., and is easily absorbed by water reflected by metal.
- a microwave oven 12 irradiates the object 11 with microwaves generated by a magnetron, vibrates water molecules in the object 11, heats and evaporates only water, and dries the object 11. .
- microwaves generated by a magnetron both the moving direction of water and the moving direction of heat can be aligned from the inside of the object 11 to the outside, so that the drying efficiency is improved.
- a waveguide, an antenna, or the like can be used as the microwave irradiation means.
- thermometers 16 and 17 are preferably used, and the thermometers 16 and 17 measure the temperature of the surface and the inside of the object 11, respectively.
- the upper part of the glass container 15 is connected to through holes 20 and 21 for inserting the sensors 18 and 19 of the thermometers 16 and 17, respectively, and to a decompression pump (for example, a vacuum pump) 22 for depressurizing the inside of the chamber 13.
- a gas outlet 24 for attaching a reduced pressure pipe 23 to be used and a gas inlet 25 for taking in air (an example of gas) in the chamber 13 are provided.
- the gas (carrier gas) to be taken in from the gas inlet 25 includes air, nitrogen, or the like, and the water evaporated by the microwave irradiation can be discharged to the outside of the chamber 13 by the carrier gas. As described above, by removing the water in the chamber 13, the humidity in the chamber 13 can be reduced, so that the drying is promoted.
- the thermometers 16 and 17 are outside the microwave oven 12 and have thermometer control units 26 and 27 to which sensors 18 and 19 for directly measuring the temperature of the object 11 are connected, respectively.
- the sensors 18 and 19 are composed of sensor units 28 and 29 having therein an optical fiber to which a thin film of a fluorescent substance (for example, magnesium phosphor) not shown is adhered at the tip, and a coated optical fiber cable (hereinafter, referred to as a cable). 30) and 31 respectively. Cables 30, 31 connect the thermometer controllers 26, 27 and the sensors 28, 29, respectively.
- the microwave oven 12 has through holes 32 and 33 through which cables 30 and 31 for connecting to thermometer control units 26 and 27 disposed outside are provided.
- the temperature of the object 11 is measured by irradiating the fluorescent substance of the sensor units 28 and 29 with flash light from the thermometer control units 26 and 27 through the optical fibers, respectively, and attenuating the fluorescent luminance that changes according to the temperature (that is, , Fluorescence relaxation time).
- the sensor units 28 and 29 one-dollar type sensors which can be arranged on the surface and inside of the object 11, respectively, were used.
- the thermometer control units 26 and 27 are a measuring station 34 that stores the measured data respectively. It is connected to the.
- the measuring station 34 is an example of a control unit that analyzes data stored in the measuring station 34 and turns on / off microwave irradiation of the microwave oven 12 based on the measured values of the thermometers 16 and 17.
- a computer 35 is connected. When the analyzed data reaches a specific temperature A lower than the denaturation temperature of the object 11, the computer 35 controls the microwave oven 12 to stop the microwave irradiation, and after stopping the microwave, the computer 1
- a specific temperature B for example, 30 ° C
- the specific temperature A was set to 40 ° C. which is less than the variable temperature of about 42 ° C.
- a pressure reducing pipe 23 connecting the inside of the chamber 13 and the pressure reducing pump 22 has a pressure sensor 36, which is opened in order from the upstream (microwave oven side), between the electronic range 12 and the pressure reducing pump 22.
- a closing valve 37, a vacuum tank 38, and a pressure regulating valve 39 are installed.
- the pressure sensor 36 is connected to the measuring station 34 via the amplifier 40, and the measuring station 34 stores the pressure value measured by the pressure sensor 36 every predetermined time.
- a mercury manometer 41 is connected to the vacuum tank 38, and measures the pressure in the vacuum tank 38.
- the electron range 12 is provided with a through hole 42 through which the pressure reducing pipe 23 passes.
- an intake pipe 43 for supplying air outside the microwave oven 12 into the chamber 13 is connected to the gas inlet 25 of the glass container 15, and the other end of the intake pipe 43 is connected to an electric power supply.
- a flow meter 44 arranged outside the sub range 12 is connected.
- the microwave oven 12 is provided with a through-hole 45 through which an intake pipe 43 passes, and the intake pipe 43 is provided with a flow control valve 46. Since the pressure in the chamber 13 is reduced by the pressure reducing pump 22, when the flow rate control valve 46 is opened, the air outside the microwave oven 12 is supplied into the chamber 13 via the intake pipe 43, and the supplied air is supplied. Generates an airflow around the object 11. This airflow promotes drying of the object 11.
- An airflow generating means is provided with an intake pipe 43, a flowmeter 44, a flow regulating valve 46 having an inlet open to the outside air, and a pressure reducing pump 22, and the pressure in the chamber 13 is reduced by the pressure reducing pump 22 so that the flow rate is reduced.
- the outside air passing through the total 44 and the flow control valve 46 is sucked into the chamber 13.
- the decompression pump 22 In consideration of the capacity, the flow regulating valve 46 is adjusted so that the pressure in the chamber 13 becomes equal to or lower than the saturated vapor pressure corresponding to the specific temperature A (the same applies to the following embodiments).
- the air in the chamber 13 sucked by the pressure reducing pump 22 and the air supplied from the suction pipe 43 are respectively supplied to the pressure adjusting valve 39. It is adjusted by the flow control valve 46.
- the water in the chamber 13 evaporated by the microwave irradiation can be released from the gas outlet 24 to the outside of the chamber 13 via the pressure reducing pipe 23. By removing the water in the chamber 13 in this manner, the humidity in the chamber 113 can be reduced, and the drying can be further promoted.
- the through holes 20, 21 provided in the glass container 15, the gas outlet 24, the gas inlet 25, and the penetrating moss 32, 33, 42, 45 provided in the microwave oven 12 include: An O-ring or sealing resin (not shown) is provided and sealed (sealed). Since the through holes 20, 21, the gas outlet 24, and the gas inlet 25 are sealed, the pressure inside the chamber 13 is reduced, so that the plate glass 14 and the glass container 15 come into close contact with each other, and the inside of the chamber 13 is closed. Can be sealed. Further, grease or the like may be applied to the contact surface between the plate glass 14 and the glass container 15 so that the contact surface is in close contact.
- the sensor units 28 and 29 of the thermometers 16 and 17 are installed on the surface and the inside of the object 11, respectively, and the object 11 is placed in the chamber 13.
- the pressure of the air in the chamber 113 by the decompression pump 22 or the air in the chamber 113 by the decompression pump 22 and the flow control valve 46 are opened, and the external air is introduced into the chamber 113 by gas. Supply from inlet 25.
- the inside of the chamber 13 is kept at a pressure lower than the saturated vapor pressure at the specific temperature A, for example, 50 to 150 mmHg (6.7 to 20. OkPa). Since the pressure in the chamber 13 is reduced, the evaporating temperature of water is reduced, and the object 11 can be dried at a low temperature.
- the target 11 was a scallop scallop and the specific temperature A was 40 ° C, which is lower than the denaturation temperature (about 42 ° C) of the target 11 which is a scallop scallop.
- thermometers 16 and 17 While measuring the temperature of the surface and the inside of the object 11 with the thermometers 16 and 17, respectively, a microwave is generated by the microwave generating element of the electronic range 12, and the object 11 is irradiated with the microwave. And heat. In the object 11, the water molecules in the object 11 vibrate by microwave irradiation to generate heat, and the heat causes the water in the object 11 to evaporate.
- the microwave is radiated to the object 11 by the microwave oven 12, and when the temperature of the surface or the inside of the object 11, that is, one of the measured values of the thermometers 16 and 17 reaches 40 ° C, the microwave is emitted from the combustor 35.
- the microwave irradiation of the microwave oven 12 is stopped by the signal of. As a result, the object 11 is not heated to the denaturation temperature or higher, so that the object 11 can be dried without denaturation.
- the object 11 is cooled by the latent heat of the water evaporated by the irradiation of the microwave, and the temperature thereof is lowered.
- One of the measured values of the temperature of the object 11 measured by the thermometers 16 and 17 becomes a specific temperature B (for example, 30 ° C) near or above the vapor pressure temperature corresponding to the pressure in the chamber 13.
- the microwave oven 12 is turned on by a signal from the computer 35, and the object 11 is heated again by irradiating the object 11 with microwaves.
- the process of irradiating the microwave again when the temperature becomes B is repeated, and the temperature control by on / off processing is performed to dry the object 11.
- the temperature control by on / off processing is performed to dry the object 11.
- the flow control valve 46 is opened to take in the air into the chamber 113 from the gas inlet 25 to generate an airflow around the object 11. By doing so, drying of the object 11 can be promoted. Further, the water evaporating from the object 11 discharged into the chamber 13 can be discharged from the gas outlet 24 to the outside of the chamber 113. At this time, the humidity in the chamber 113 decreases, so that The drying of the object 11 can be promoted.
- the gas supplied from the chamber 13 to the decompression pump 22 does not rise in temperature due to the on / off control of the microwave, and the gas is sent into the chamber 1 by the airflow generation means.
- the humidity becomes 95% or less, and the life of the vacuum pump 22 can be extended.
- the reduced-pressure drying device 50 has a sealable cylindrical chamber 52 disposed in a casing 51.
- the first chamber 52 is provided with a microwave generating element 53 which is an example of a mouthpiece irradiating means for irradiating microwaves toward the inside thereof.
- the vacuum drying device 50 irradiates a microwave mouth wave from the microwave generation element 53 at a predetermined cycle, and the temperature of the object (scallop scallop) 11 is lower than the denaturation temperature (denature temperature) of the object 11.
- the temperature does not exceed a specific temperature A (40 ° C.)! / It is not shown to control the microwave irradiation time, and a computer as an example of control means is provided.
- the chamber 52 is provided with its axis inclined at, for example, 30 degrees with respect to the vertical axis in order to appropriately stir the object 11 disposed therein.
- the upper surface of the casing 51 is open, and a door 54 for charging the object 11 is provided on the upper surface. Further, a lid (not shown) for sealing the chamber 52 is provided. Note that a lid may be formed inside the door 54 to close the chamber 52 when the door 54 is closed.
- a cylindrical drying container 55 having an open top for storing one or more objects 11 is installed with its axis aligned with the axis of the chamber 52. .
- a mesh having an opening having a size through which the object 11 does not pass is provided on the side surface of the drying container 55.
- a large-diameter gear 56 is provided on the outer peripheral surface at the lower part of the drying container 55.
- the gear 56 is provided with a matching small-diameter drive gear 57, and the drive gear 57 is connected to a motor 59 via a rotation shaft 58.
- the rotating shaft 58 and the motor rotating shaft 60 of the motor 59 are arranged at right angles, and spiral gears 61 and 62 are attached to the base end of the rotating shaft 58 and the distal end of the motor rotating shaft 60 of the motor 59, respectively.
- spiral gears 61 and 62 are attached to the base end of the rotating shaft 58 and the distal end of the motor rotating shaft 60 of the motor 59, respectively.
- a gas outlet 63 is provided at a lower portion of the chamber 52, and the gas outlet 63 is a decompression pump (for example, a vacuum pump) for reducing the pressure in the chamber 52 via an exhaust pipe 64. Connected to 65.
- a pressure regulating valve 66 from the upstream side (chamber one 52 side) and water generated in the chamber one 52 are condensed and stored in the exhaust nozzle 64 to prevent water from entering the pressure reducing pump 65.
- the condenser 67 is connected.
- a gas inlet 69 to which an intake pipe 68 for taking in air (an example of gas) outside the casing 51 into the chamber 52 is provided at an upper portion of the chamber 52.
- a flow control valve 70 is provided in the middle of the intake nozzle 68 to adjust the flow rate of the air taken into the chamber 52.
- the downstream end of the suction pipe 68 is attached so as to be tangential to the outer periphery of the cylindrical chamber 52, and air from the gas inlet 69 is supplied to the chamber 52. It flows substantially tangentially to the side wall, and a swirling flow ⁇ (that is, an air flow) can be formed around the drying container 55 containing the object 11.
- An airflow generating means is provided with the intake pipe 68 and the flow control valve 70. The swirling flow ⁇ generated by the airflow generating means also causes the mesh force of the drying container 55 to enter the drying container 55 and come into contact with the target object 11, so that the drying of the target object 11 can be promoted.
- the water evaporated from the object 11 in the chamber 52 can be discharged from the gas outlet 63 to the outside of the chamber 52 together with the swirling flow ⁇ . At this time, the humidity in the chamber 52 decreases. In addition, the drying of the object 11 can be promoted.
- the plurality of objects 11 are put in the drying container 55, the chamber 52 is covered with the lid, the chamber 52 is closed, and then the door 54 is closed. While the air in the chamber 52 is sucked by the pressure reducing pump 65, the flow control valve 70 is opened to supply the external air to the chamber 52 with the gas inlet 69, and the inside of the chamber 52 is, for example, 50 to 150 mmHg ( 6. 7 to 20. Reduce the pressure to OkPa, specifically 7.376 kPa). The amount of air sucked by the pressure reducing pump 65 is adjusted by a pressure regulating valve 66, and the amount of air taken into the chamber 52 is adjusted by a flow regulating valve 70.
- the microwave generator 53 is controlled by a computer, The microwave is periodically turned on and off from the microwave generating element 53 to irradiate the object, thereby rapidly heating the object 11 in a pulsed manner.
- the specific temperature A for drying the object 11 is set at less than the protein denaturation temperature of about 42 ° C, for example, 40 ° C.
- the cycle of turning on and off the microwave is the cycle of microwave irradiation time a (on) and the time of not irradiating microwave b (off). Note that the irradiation time a and the stop time b are determined. As a result, the object 11 is heated to a temperature lower than its denaturation temperature, so that the object 11 can be dried without denaturation.
- the object 11 When the microwave is stopped on the object 11, the object 11 is heated to a specific temperature A by the microwave irradiation and cooled by the latent heat of the water in the object 11 that has evaporated and the temperature of the object 11 After the elapse of the stop time b, the object 11 is heated again to the specific temperature A by applying microwaves again and dried.
- the irradiation time a is a force that varies depending on the object, for example, 0.5 seconds to several minutes, preferably 1 to several seconds, and the stop time b may be the same as or different from the irradiation time a.
- the water discharged from the gas outlet 63 together with the swirling flow a passing through the inside of the chamber 52 is condensed by the condenser 67, so that the water does not enter the pressure reducing pump 65, Can be extended. Further, since the object 11 is rotated by the motor 59, the drying efficiency can be improved. In this case, it is more preferable that the rotating direction of the drying container 55 be opposite to the swirling direction of the swirling flow, since the air can easily contact the object 11.
- FIG. 4 a vacuum drying apparatus 71 using microwaves according to a modification of the second embodiment of the present invention will be described.
- the vacuum drying device 71 has a closed cylindrical chamber 72.
- a microwave generating mechanism 74 having a microwave generating element (not shown) is attached to the first chamber 72 via a waveguide 73.
- the microwave generation mechanism 74 and the waveguide 73 constitute a microphone mouth wave irradiation means.
- the upper part of the chamber 72 has a closed lid (not shown), and has a structure in which an object to be dried can be loaded and the dried object can be unloaded.
- a tray or the like for placing an object on the chamber 72 can be freely provided.
- the first chamber 72 constitutes a part of an air flow generating means, and includes a gas inlet 75 (preferably provided with a flow control valve) for introducing gas from the outside of the first chamber 72, and a pressure reducing tube 76.
- a pressure reducing pump 77 for reducing the pressure inside the chamber 72 to, for example, 50 to 150 mmHg is provided.
- a pressure gauge 78 and a thermometer 79 for measuring the pressure and temperature in the chamber 72 are attached to the chamber 72.
- the reduced-pressure drying device 71 analyzes the data from the pressure gauge 78 and the thermometer 79, and maintains the temperature in the chamber-72, that is, the temperature of the object in the chamber-72 below the denaturation temperature of the object.
- a control means 79a for performing on / off control of the microwave generating element and the pressure reducing pump 77 is provided. Accordingly, the object is heated to a temperature lower than its denaturation temperature, and thus can be dried without denaturing the object.
- a vacuum drying apparatus 80 using microwaves according to a third embodiment of the present invention will be described with reference to FIGS.
- the reduced-pressure drying device 80 has a plurality of, for example, 18 trays 81 with lids, which are an example of a chamber in which the object 11 is placed.
- the tray 81 with a lid is made of a material that reflects microwaves, for example, a metal (specifically, stainless steel), and has a tray body 82 on which the object 11 is placed. It has a hemispherical lid 83 formed of a material through which microwaves pass, for example, quartz glass, and placed on the upper portion of the tray body 82.
- the lid 83 can be opened and closed by an opening and closing mechanism (not shown). Further, a pressure reducing pipe connection port 84 and a gas introduction pipe connection port 85 are provided at the bottom of the tray body 82. The depressurizing pipe connection port 84 and the gas introduction pipe connection port 85 are provided with female couplers (pipe couplers) 86 and 87 having a normally closed on-off valve, respectively.
- the reduced-pressure drying device 80 includes two pairs of endless renoles (hereinafter simply referred to as renoles) 88, 89 and a pair arranged at equal intervals. It has a conveyor 91 having 18 trolleys 90 arranged over the entire length of the rails 88, 89 and straddling the lanes 88, 89.
- the trays 81 with the lids are fixed on the respective carts 90, and the trays 81 with the lids are conveyed by the conveyor 91 so as to intermittently move by a fixed distance (the total length of the rails ⁇ the number of carts). That is, conveyor 91 has 18 stop positions. The tray 81 with the lid is sequentially stopped at each stop position.
- the bogies 90 are provided at both ends of a plate-shaped bogie main body 92 on which a tray 81 with a lid is placed, and two axles 93 attached to the front and rear of the bogie main body 92, and run on rails 88 and 89. With four wheels 94. Further, connecting portions 95 and 96 for connecting with the adjacent bogie 90 are provided before and after the bogie main body 92. The connecting portions 95 and 96 are provided with shaft holes 98 for inserting the connecting pins 97, respectively, so that the trucks 90 can smoothly run on the force rails 88 and 89. Further, the conveyor 91 is provided with a drive device (not shown) for intermittently feeding the cart 90. This drive device may be mounted on the bogie 90, or may be a predetermined length feed device including a cylinder or the like provided between the rails 88 and 89.
- the above-mentioned conveyor 91 has a loading station A in which the target object 11 is loaded into the tray 81 with a lid from the loading conveyor 99, and the target transported from the loading conveyor 99.
- the object 11 is placed on the tray body 82 with the lid 83 in the loading station A open.
- a sealing station B is provided on the downstream side in the traveling direction of the loading station A, and has four stop positions so that the lid 83 can be put on the tray main body 82.
- all the lid closing operations can be performed at a stop position of about 1 or 2 using four positions.
- a decompression start station C is provided downstream of the sealing station B in the traveling direction.
- a male pump connected to a decompression pump 100 at the lower part of the conveyor 91 and moved up and down by an elevating mechanism 101 is provided.
- the male couplers 102 and 105 are adapted to be combined with the female couplers 86 and 87 when ascended by the lifting mechanisms 101 and 104, respectively.
- An airflow generating means is provided with the flow control valve 103, the female coupler 87 and the male coupler 105, the gas introduction pipe connection port 85, and the decompression pump 100.
- 84a and 84b indicate decompression pipes, respectively, and 85a and 85b indicate ventilation pipes.
- Couplers with shut-off valves female and male couplers 86 and 102 are provided between pressure reduction pipes 84a and 84b.
- a coupler with a shut-off valve female and male power braces 87, 105) is provided between the ventilation pipes 85a, 85b.
- a microwave heating station D having seven stop positions is provided downstream of the decompression start station C in the traveling direction.
- the inside of the tray 81 with the lid is depressurized to some extent at the decompression start station C, and the male couplers 102 and 105 are lowered to carry the tray 81 with the lid separated from the female couplers 86 and 87. Is done.
- the lower part is connected to a pressure reducing pump 100, and is connected to a male coupler 102 that moves up and down by an elevating mechanism 101, and a flow control valve 103 that introduces outside air.
- a male coupler 105 that moves up and down by a lifting mechanism 104.
- the airflow generating means was operated to generate an airflow around the object 11 and each stop position was placed on the trolley 90.
- the elevating mechanisms 101 and 104 are moved up and down to connect and disconnect the male couplers 102 and 105 and the female couplers 86 and 87.
- a microwave generating element 106 which is an example of microwave irradiation means, is located above the lid-attached tray 81 at each stop position.
- the microwave mouth heating station D is provided with a casing 107 for preventing electromagnetic waves generated from the microwave generating element 106 from leaking outside.
- the microwave is turned on and off at a predetermined cycle so that the temperature of the object 11 placed in the tray 81 with the lid is lower than the alteration temperature.
- an experiment was performed on object 11 in the same environment (for example, For example, the same or an improved apparatus as in Example 1 may be used), and the temperature of the object 11 irradiated with the microwave is measured, and the temperature of the object 11 is set within a predetermined range (for example, a specific temperature). (A and B) to determine the on / off cycle and microwave power.
- the tray 81 with the lid moves to the pressure recovery station E.
- the male coupler 105 with the flow control valve 103 and the male coupler 105 shown in Fig. 6 (the microwave generating element 106, the decompression pump 100, the elevating mechanism 101, and the male coupler 102 are not provided)
- An elevating mechanism 104 for elevating the elevating mechanism is provided, and air can be externally introduced into the tray 81 with a lid via the flow rate adjusting valve 103.
- the tray 81 with the lid is conveyed to the opening station F, the lid 83 is opened, intermittently fed to the discharge station G, and the dried object 11 on the tray body 82 is transferred through the discharge conveyor 108. It is carried out.
- a guide 109 for guiding the object 11 to the outside according to the movement of the carriage 90 can be provided at the unloading station G.
- the tray 81 with the cover becomes empty, so that the tray 81 moves to the loading preparation station H, cleans the tray body 82, and moves to the loading station A.
- the intermittent feeding operation of the carriage 90 is repeated to continuously dry a large number of objects 11.
- the reduced-pressure drying device 80a has a tray 81 with a lid provided with a reduced-pressure pipe connection port 84 and a gas introduction pipe connection port 85 at the bottom, and a tray body 82 and a lid 83. Eighty trays 81 with lids are mounted on a chain conveyor (an example of a conveyor) 91a. As shown in Fig. 8, loading station A, sealing station B, decompression start station C, microwave heating station D, and decompression station E, opening station F, unloading station G, and loading preparation station H.
- a blower pipe 85a provided with a flow rate regulating valve 87a at the front end is attached.
- a pressure reducing pipe 84a having an on-off valve (solenoid valve) 86a is attached.
- the ends of the pressure reducing pipes 84a provided on the tray body 82 of the 18 trays 81 with lids are connected to endless flexible tubes 95a, respectively. More
- the flexible tube 95a is connected to a vacuum pump 100a via a pump tube 96a and a rotary joint (not shown). The rotary joint prevents the pump tube 96a from becoming tangled even when the tray 81 with the lid is rotated.
- the pump tube 96a is also provided with a signal line (not shown) for turning on / off the on-off valve 86a provided in each tray body 82 in parallel.
- a signal line (not shown) for turning on / off the on-off valve 86a provided in each tray body 82 in parallel.
- the control means 100b provided adjacent to the decompression pump 100a via a connection point, and connected to a tray 81 with a lid in the decompression start station C and the microwave heating station D by a signal from the control means 100b.
- the on-off valve 86a is turned on to reduce the pressure inside, and further, external air is introduced from the gas inlet pipe connection port 85.
- the casing 107a of the microwave heating station D is different from the casing 107 of the reduced-pressure drying device 80 described above, in that the inner lower side surface is open and the tray with a lid that moves with the transport of the chain conveyor 91a.
- the pump tube 96a connected to 81 and the signal line force juxtaposed thereto can be moved smoothly!
- a signal for controlling the chain conveyor 91a, opening / closing the lid 83 of the tray 81 with lid, and on / off control of the microwave generating element 106 is provided to the control means 100b based on a program. Has occurred.
- the operation in each of the stations A to H is basically the same as that of the reduced-pressure drying device 80, and a detailed description thereof will be omitted.
- a carriage 112 of a conveyor 111 has a donut-shaped flat plate shape, and a plurality of, for example, eight trays 81 with lids are mounted on the carriage 112 at predetermined intervals.
- the vacuum drying device 110 is divided into a loading station a, a sealing and decompression station b, a microphone mouth heating station c, a pressure recovery station d, an opening station e, and an unloading station f for unloading the object 11 in that order. .
- the object 11 is loaded from the loading conveyor 99 into the tray 81 with the lid, and at the sealing and decompression station b, after closing the lid 83 of the tray 81 with the lid, the tray with the lid is closed.
- the air in 81 is sucked by the vacuum pump 100 (see Fig. 6).
- a microwave generating element (not shown)
- the target object 11 is dried by carrying it into the casing 113 provided therein, depressurizing the inside of the tray 81 with the lid, and irradiating microwaves with a microwave generating element (not shown) while generating an air flow.
- the pressure inside the tray 81 with the lid that came out of the casing 113 is set to the atmospheric pressure, at the opening station e, the lid 83 of the tray 81 with the lid is opened, and at the discharge station f, the drying inside the tray 81 with the lid
- the object 11 is carried out to the carry-out conveyor 108.
- three trays 81 with lids are arranged at the microwave heating station and one at the other stations.
- FIG. 12 a vacuum drying apparatus 120 using microwaves according to a fourth embodiment of the present invention will be described.
- the vacuum drying device 120 includes a roller conveyor (an example of a conveyor; hereinafter, also simply referred to as a “conveyor”) 121 for conveying the object 11 and a microwave for irradiating the object 11 conveyed by the conveyor 121 with microwaves under reduced pressure.
- a microwave drying chamber (an example of a chamber) 123 in which a wave generating element 122 is installed, a preliminary decompression chamber 124 arranged upstream of the microwave drying chamber 123, and a downstream chamber 124 arranged downstream of the microwave drying chamber 123.
- a return pressure chamber 125 is an example of a chamber
- the object 11 is passed through the preliminary decompression chamber 124, the microwave drying chamber 123, and the pressure recovery chamber 125 to which the upstream side force of the conveyor 121 is also connected, and the preliminary decompression chamber 124, the microwave drying chamber
- the upstream inlet of the pre-decompression chamber 124, between the pre-decompression chamber 124 and the microwave drying chamber 123, between the microwave drying chamber 123 and the decompression chamber 125, Doors 126 to 129 are provided at the downstream entrance of the pressure recovery chamber 125, respectively.
- the lengths of the preliminary decompression chamber 124, the microwave drying chamber 123, and the decompression chamber 125 in the traveling direction of the conveyor 121 are, for example, each of the objects 11 placed on the conveyor 121 at predetermined intervals. One, three, one can be placed.
- a decompression pump (not shown) is connected to each of the preliminary decompression chamber 124, the microwave drying chamber 123, and the decompression chamber 125.
- the microwave drying chamber 123 has a plurality of, for example, three microwave generating elements 122 at predetermined intervals, and a gas inlet (not shown) for introducing a gas (for example, air) with an external force into the microwave drying chamber 123.
- the gas in the microwave drying chamber 123 is stirred,
- a fan 130 for generating airflow is provided in the enclosure.
- the reduced-pressure drying device 120 irradiates a microwave from the microwave generating element 122 at a predetermined cycle by a computer, which is an example of a control unit (not shown), so that the temperature of the object 11 Microwave on / off processing is performed so that the temperature becomes lower than the alteration temperature.
- the computer also controls the transport speed of the conveyor 121, controls the opening and closing of the doors 126 to 129, controls the operation of the fan 130, and controls the operation of the pressure reducing pump.
- the conveyor 121 includes, in order from the upstream side, a transfer station A on the upstream side of the door 126, a decompression station B in the preliminary decompression chamber 124, a heating station C in the microwave drying chamber 123, and a decompression chamber in the decompression chamber 125 It is divided into a station D and an unloading station E downstream of the door 129, and in each station, the conveyor 121 can be operated independently.
- the doors 127 and 128 are closed, and the pressure in the microwave drying chamber 123 is reduced by a vacuum pump. It is preferable that the microwave drying chamber 123 is always kept under reduced pressure.
- the door 126 is opened, and the conveyors 121 of the transfer station A and the decompression station B are operated to convey the object 11 to the pre-decompression chamber 124. Then, the door 126 is closed, and the inside of the pre-decompression chamber 124 is depressurized by a decompression pump. Reduce pressure.
- the door 127 is opened, and the conveyors 121 in the pressure-reducing station B and the heating station C are operated to convey the object 11 into the microwave drying chamber 123.
- the door 127 is closed, and the microwave drying chamber 123 is closed.
- the object 11 is irradiated with microwaves from the microwave generating element 122, and external force is introduced into the microwave drying chamber 123 through the gas inlet, and the fan 130 is operated to flow air around the object 11. Is generated, and the object 11 is dried.
- the pressure inside the pressure recovery chamber 125 is reduced to a predetermined pressure by a pressure reducing pump with the door 129 closed.
- the door 128 is opened, and the conveyor 121 of the heating station C and the pressure recovery station D is operated to transport the object 11 to the pressure recovery chamber 125, and the door 128 is opened. Close.
- the target object 11 can be dried by the reduced-pressure drying device 120.
- the object 11 can be continuously conveyed at predetermined intervals and dried by the force conveyor 121 described for one object 11.
- a conveyor a belt conveyor or a chain conveyor capable of transporting an object while sealing the microwave drying chamber 123, the preliminary decompression chamber 124, and the pressure recovery chamber 125 using a roller conveyor can also be used.
- a scalloped scallop was irradiated with microwaves as an object 11 and dried.
- the flow control valve 46 of the vacuum drying apparatus 10 is closed, the on-off valve 37 and the pressure control valve 39 are opened, and the pressure in the chamber 13 is reduced to 50, 100, and 150 mmHg by the vacuum pump 22.
- the object 11 was heated and dried at each pressure in a pulsed manner, and the water content of the object 11 at a predetermined time was measured.
- the water content is a value obtained by dividing the weight (g) of water in the object by the weight (g-dry) when the object is completely dried (the same applies hereinafter). As shown in FIG. 13, the lower the pressure in the chamber 13 (50 mm Hg), the larger the water reduction rate in the object tended to be.
- the scallops of the scallops were dried by irradiating microwaves to the target 11.
- the flow control valve 46 of the vacuum drying device 10 is opened, the on-off valve 37 and the pressure control valve 39 are opened, the pressure in the chamber 13 is reduced to 50 mmHg by the vacuum pump 22, and the air (gas flow) supplied into the chamber 13 is reduced.
- the flow rates are 0, 1.0, 1.5, 2.0, 2.5, 3.0 liters Z minutes, the specific temperature A is 40 ° C, and the specific temperature B is 30 ° C.
- the object 11 was heated and dried in a pulsed manner, and the water content of the object at a predetermined time was measured.
- the flow rate of 0 liter Z is the same as in Test Example 1.
- Figure 14 As shown in the figure, the drying efficiency was improved by supplying air into the chamber 13. Also, the flow rate of the air supplied into the chamber 13 was preferably 1.0 and 1.5 liters Z.
- the scallops of the scallops were dried by irradiating microwaves to the target 11.
- the object 11 was heated in a pulsed manner and dried by setting it to 1.0 liter Z (the same as the case of the air flow of 1.0 liter Z in Test Example 2).
- the case of continuous heating and drying under the same conditions was taken as a comparative example, and the water content of the object at a predetermined time was measured. As shown in FIG.
- the amount of power used for a longer drying time was larger than when pulsed irradiation was performed.
- the temperature of the target increased to 80 to 150 ° C, and the target sometimes turned black.
- the scallops of the scallops were dried by irradiating microwaves to the target 11.
- Open the flow control valve 46 of the vacuum drying device 10 open the on-off valve 37 and the pressure control valve 39, reduce the pressure in the chamber 13 to 50 mmHg by the vacuum pump 22, and reduce the flow rate of air supplied into the chamber 13.
- the object 11 was heated in a pulsed manner and dried by setting it to 1.0 liter Z (the same as the case of the air flow of 1.0 liter Z in Test Example 2).
- the target was dried using a dryer that blows hot air into the chamber where the target is placed to dry the chamber.
- the temperature of the hot air to be blown was 40 ° C.
- the flow rate was 1.0 liter Z minutes.
- the chamber 1 is open to the atmosphere, and the pressure in the chamber 1 is atmospheric pressure.
- FIG. 16 it was found that the reduced-pressure drying method of the present invention had a higher drying rate than the drying method using hot-air drying.
- the object 11 is dried in Test Example 4, the moisture content of the surface and the inside of the object 11, the surface force of one of the objects 11 is applied to the other surface (the cross section of the object 11) is 9 or the like. Measurements were taken at predetermined intervals for a total of 10 points. As shown in FIG. 17 (A), the object 11 It was found that it was uniformly dried on the surface and inside. In the comparative example using hot air drying, in which the moisture content was measured under the same conditions, as shown in FIG. 17 (B), the material was dried near the surface of the object 11, but the inside dried too much! /, !, I understand.
- FIGS. 18A and 18B show the structures of the surface section of the object before and after drying, respectively.
- the surface texture of the object 11 is substantially unchanged before and after drying. Even after drying, the surface texture of the object 11 does not shrink, and the water flow path is secured. ! Accordingly, it is understood that the drying speed is high in the reduced-pressure drying apparatus and method of the present invention.
- FIG. 18 (C) in the drying method using warm air, the surface texture of the object 11 shrinks and becomes dense, and a moisture path is not secured. It was found that it became difficult for the moisture in the inside to come out, and the drying speed became slow.
- the present invention is not limited to the embodiments described above.
- the present invention is not limited to these embodiments, and may be changed without departing from the spirit of the invention.
- the present invention is also applicable to a case in which some or all of the embodiments and modifications are combined.
- a fan for stirring the gas inside the chamber 1 may be provided.
- the microwave may be irradiated by microwave irradiation means such as a waveguide or an antenna.
- the reduced-pressure drying method and apparatus using microwaves of the present invention turn on and off the microwaves at a predetermined cycle, and are connected to a reduced-pressure pump to reduce the maximum temperature of an object in the chamber that is reduced in pressure. Drying is performed by rapid heating in a pulse while suppressing the temperature to a specific temperature A or lower, so that the target object can be dried at a temperature lower than the alteration temperature in a short time.
- rapid drying can be performed without deteriorating the object, and dry foods (for example, shellfish, vegetables, fruits, meats, and fish) can be easily manufactured, and the laundry can be washed. When it is applied, drying can be performed in a short time without damaging the dough. When used for drying wood, electronic equipment, etc., rapid drying can be performed without destroying the interior.
- dry foods for example, shellfish, vegetables, fruits, meats, and fish
Abstract
Description
Claims
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JP2006512332A JP4474506B2 (ja) | 2004-04-12 | 2005-04-11 | マイクロ波を用いた減圧乾燥方法及びその装置 |
US11/547,915 US7665226B2 (en) | 2004-04-12 | 2005-04-11 | Method for drying under reduced pressure using microwaves |
KR1020087025258A KR100928275B1 (ko) | 2004-04-12 | 2005-04-11 | 마이크로파를 사용한 감압 건조 방법 및 그 장치 |
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US (1) | US7665226B2 (ja) |
JP (1) | JP4474506B2 (ja) |
KR (2) | KR20070008688A (ja) |
CN (1) | CN100562700C (ja) |
WO (1) | WO2005100891A1 (ja) |
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WO2021066108A1 (ja) * | 2019-10-01 | 2021-04-08 | 株式会社ニチレイフーズ | アセロラ果実の乾燥物およびその製造方法 |
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Also Published As
Publication number | Publication date |
---|---|
US7665226B2 (en) | 2010-02-23 |
KR100928275B1 (ko) | 2009-11-24 |
JPWO2005100891A1 (ja) | 2008-07-31 |
KR20070008688A (ko) | 2007-01-17 |
JP4474506B2 (ja) | 2010-06-09 |
CN1950658A (zh) | 2007-04-18 |
CN100562700C (zh) | 2009-11-25 |
US20070271811A1 (en) | 2007-11-29 |
KR20080096608A (ko) | 2008-10-30 |
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