WO1999037964A1 - Method and means for drying - Google Patents

Method and means for drying Download PDF

Info

Publication number
WO1999037964A1
WO1999037964A1 PCT/SE1999/000080 SE9900080W WO9937964A1 WO 1999037964 A1 WO1999037964 A1 WO 1999037964A1 SE 9900080 W SE9900080 W SE 9900080W WO 9937964 A1 WO9937964 A1 WO 9937964A1
Authority
WO
WIPO (PCT)
Prior art keywords
drying
microwave
processing chamber
receptacles
microwaves
Prior art date
Application number
PCT/SE1999/000080
Other languages
French (fr)
Inventor
Per Erik Gustafsson
Original Assignee
Gisip Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gisip Ab filed Critical Gisip Ab
Publication of WO1999037964A1 publication Critical patent/WO1999037964A1/en

Links

Classifications

    • 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
    • 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
    • F26B5/041—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 for drying flowable materials, e.g. suspensions, bulk goods, in a continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • 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
    • F26B5/042—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 for drying articles or discrete batches of material in a continuous or semi-continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • 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 is for method and means for drying under vacuum with heating by microwaves.
  • the drying is performed by a combination of microwave heating and vacuum in a microwave transparent container or corresponding device.
  • Moist is vaporised and exhausted at low temperatures, while the microwaves keep up the temperature of the material which is being treated so that it will not be cooled off during the process.
  • Moist is here used to mean not only water but also other substances that may be vaporised, for example some alcohols.
  • the container may be tubes or vacuum bowls and positioned in cavities where microwaves are supplied in known manner.
  • the receptacles may e.g. be tubes which are mounted between the gables of the microwave applicator or cavity, the cavity may hold one or several tubes.
  • the material which is to be treated is put into the tubes, one tube at a time being "charged".
  • the tubes may also have lock-chambers at their ends.
  • a tried out pattern of aluminium tape or the like material may be applied to the inside or the outside of the receptacles and function as directing antennas for the microwaves and distribute them in a desired way within the receptacle. This makes many different applications of the method possible.
  • the receptacles may be fixedly or movably mounted relative to the microwave applicator and may also be equipped with conveyor for loading and unloading of goods.
  • Figure 1 shows a cross-section of a means having one processing chamber.
  • Figure 2 shows a means with a different positioning of the processing chamber.
  • Figures 3 shows a means having three processing chambers.
  • Figure 4 shows a means with several process chambers.
  • Figure 5 shows a cross section of the means of figure 4.
  • Figure 6 shows a means having movably arranged processing chambers.
  • Figure 7 shows a side view of the means of figure 6.
  • Figure 8 shows a means having locks for the goods.
  • Figure 9 shows the means of figure 8 in cross section.
  • Figures 10 and 11 show a continuously operating means according to the invention.
  • the means shown in figure 1 comprises a processing chamber 1 which by a tube 3 is connected to a condensate collector and a vacuum pump.
  • a microwave generator is arranged in the space 2 below the processing chamber and is cooled by a fan 4.
  • a preferably cylindrical processing chamber 1 may also be positioned with horizontal axis as shown in figure 2.
  • In the processing chamber there is a an inner chamber 6 which is rotatable and then is driven by a motor which is placed in the space 5 underneath the processing chamber.
  • the vacuum equipment and the microwave generator are positioned in the lower space 5.
  • the means shown in figure 3 has three processing chambers 8, 9, 10 arranged horizontally side by side.
  • Microwave generators 11 , 12 are positioned on top of the outer enclosure which delimits the cavity or microwave applicator and surrounds the processing chambers while the condensate collector 7 and the vacuum equipment are positioned under the outer enclosure in the common stand.
  • FIGS 4 and 5 show a means having eight vertically positioned cylindrical processing chambers 8, 9.
  • the middle there is a common cylindrical space through which the 3 vacuum connections are made and the outer walls of which carry the processing chambers directly or by brackets.
  • the middle cylinder 13 may be rotated and the processing chambers then follow along which may give the desired equalisation of the microwave energy which is supplied.
  • the means shown in figures 6 and 7 has four horizontally positioned cylindrical processing chambers 14, 15, 16, 17 which have a common, central mounting. By this the processing chambers may be rotated or given a to- and fro motion around a middle shaft which in this part coincides with the evacuation tube 3 through which moist which has been removed is directed to the collecting container 7.
  • Microwave generators are positioned at the outside of a common outer housing of the processing chambers.
  • the processing chamber 1 is designed as an horizontal cylinder which is closed by gables 19, 20.
  • vacuum locks 25, 26 through which goods 27 may be supplied and continuously removed from the processing chamber which preferably has a built-in goods conveyor, without changing the pressure inside the chamber.
  • microwave generators 21 , 22 are arranged on the outside of the housing which surrounds the processing chamber.
  • a further embodiment of the invention is shown in figures 10 and 11.
  • a continuous conveyor 28 with scrapers 29 moves in a space within the processing chamber 1 which is delimited by an upper wall 33 and a lower wall 32. Goods is supplied through a supply tube 30 and follows with the conveyor along the separating walls 33 and 32 whereupon it is removed through the tube 31. Vacuum locks are arranged at the tubes
  • the processing chambers are made from microwave transparent material, for example polyethylene.
  • a patter of aluminium strips or other microwave reflecting material may be applied to the inner or outer walls of the processing chambers in order to control the distribution of the microwave energy in the processing chambers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

The present invention is for a method and means for drying under vacuum with heating by means of microwaves. According to the invention the drying is by a combination of heating with microwaves and vacuum inside a microwave transparent receptacle or the like. The means comprises a processing chamber (1) which through a tube (3) is connected with a condensate collector and vacuum pump. A microwave generator is mounted in the space (2) below the processing chamber.

Description

Method and means for drying.
The present invention is for method and means for drying under vacuum with heating by microwaves.
Many different materials and goods, primarily of organic materials, which shall or ought to be dried in connection with manufacture and/or use can not withstand exposure to high temperatures. In spite of this there is often a need for rapid drying without temperature decrease, in most case also with a limited increase of the temperature within the range that the material will stand.
According to the invention the drying is performed by a combination of microwave heating and vacuum in a microwave transparent container or corresponding device. Moist is vaporised and exhausted at low temperatures, while the microwaves keep up the temperature of the material which is being treated so that it will not be cooled off during the process. Moist is here used to mean not only water but also other substances that may be vaporised, for example some alcohols. The container may be tubes or vacuum bowls and positioned in cavities where microwaves are supplied in known manner.
The receptacles may e.g. be tubes which are mounted between the gables of the microwave applicator or cavity, the cavity may hold one or several tubes. The material which is to be treated is put into the tubes, one tube at a time being "charged". The tubes may also have lock-chambers at their ends. A tried out pattern of aluminium tape or the like material may be applied to the inside or the outside of the receptacles and function as directing antennas for the microwaves and distribute them in a desired way within the receptacle. This makes many different applications of the method possible.
The receptacles may be fixedly or movably mounted relative to the microwave applicator and may also be equipped with conveyor for loading and unloading of goods.
The invention will below be described more in detail with reference to the embodiments which are shown in the enclosed drawings. 2
Figure 1 shows a cross-section of a means having one processing chamber.
Figure 2 shows a means with a different positioning of the processing chamber.
Figures 3 shows a means having three processing chambers.
Figure 4 shows a means with several process chambers.
Figure 5 shows a cross section of the means of figure 4.
Figure 6 shows a means having movably arranged processing chambers.
Figure 7 shows a side view of the means of figure 6.
Figure 8 shows a means having locks for the goods.
Figure 9 shows the means of figure 8 in cross section.
Figures 10 and 11 show a continuously operating means according to the invention.
The means shown in figure 1 comprises a processing chamber 1 which by a tube 3 is connected to a condensate collector and a vacuum pump. A microwave generator is arranged in the space 2 below the processing chamber and is cooled by a fan 4. A preferably cylindrical processing chamber 1 may also be positioned with horizontal axis as shown in figure 2. In the processing chamber there is a an inner chamber 6 which is rotatable and then is driven by a motor which is placed in the space 5 underneath the processing chamber. Suitably also the vacuum equipment and the microwave generator are positioned in the lower space 5.
The means shown in figure 3 has three processing chambers 8, 9, 10 arranged horizontally side by side. Microwave generators 11 , 12 are positioned on top of the outer enclosure which delimits the cavity or microwave applicator and surrounds the processing chambers while the condensate collector 7 and the vacuum equipment are positioned under the outer enclosure in the common stand.
Figures 4 and 5 show a means having eight vertically positioned cylindrical processing chambers 8, 9. In the middle there is a common cylindrical space through which the 3 vacuum connections are made and the outer walls of which carry the processing chambers directly or by brackets. The middle cylinder 13 may be rotated and the processing chambers then follow along which may give the desired equalisation of the microwave energy which is supplied.
The means shown in figures 6 and 7 has four horizontally positioned cylindrical processing chambers 14, 15, 16, 17 which have a common, central mounting. By this the processing chambers may be rotated or given a to- and fro motion around a middle shaft which in this part coincides with the evacuation tube 3 through which moist which has been removed is directed to the collecting container 7. Microwave generators are positioned at the outside of a common outer housing of the processing chambers.
A further embodiment of the invention is shown in the figures 8 and 9. The processing chamber 1 is designed as an horizontal cylinder which is closed by gables 19, 20. In connection with these there are vacuum locks 25, 26 through which goods 27 may be supplied and continuously removed from the processing chamber which preferably has a built-in goods conveyor, without changing the pressure inside the chamber. Also in this case microwave generators 21 , 22 are arranged on the outside of the housing which surrounds the processing chamber.
A further embodiment of the invention is shown in figures 10 and 11. A continuous conveyor 28 with scrapers 29 moves in a space within the processing chamber 1 which is delimited by an upper wall 33 and a lower wall 32. Goods is supplied through a supply tube 30 and follows with the conveyor along the separating walls 33 and 32 whereupon it is removed through the tube 31. Vacuum locks are arranged at the tubes
30 and 31 and microwave generators are suitably arranged outside the common outer housing.
In all of these cases the processing chambers are made from microwave transparent material, for example polyethylene. A patter of aluminium strips or other microwave reflecting material may be applied to the inner or outer walls of the processing chambers in order to control the distribution of the microwave energy in the processing chambers.

Claims

CLAIMS.
1. Method for drying characterized therein that the drying is performed under vacuum and simultaneous supply of microwave energy so that there is no decrease of the temperature..
2. Means for simultaneous drying under vacuum and supplying of microwave energy characterized therein that the drying is performed having the goods inside a microwave transparent container..
3. Means according to any of the preceding claims 1 characterized therein that several receptacles are placed in the same applicator.
4. Means according to any of the preceding claims characterized therein that the receptacles are moving during the drying.
5. Means according to any of the preceding claims characterized therein that the receptacles have a pattern of a metallic material on their inside or outside for distributing and spreading microwaves.
6. Anything that explicitly or implicitly is apparent from the description, claims or drawings.
PCT/SE1999/000080 1998-01-23 1999-01-20 Method and means for drying WO1999037964A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9800213A SE9800213L (en) 1998-01-23 1998-01-23 Methods and apparatus for drying
SE9800213-2 1998-01-23

Publications (1)

Publication Number Publication Date
WO1999037964A1 true WO1999037964A1 (en) 1999-07-29

Family

ID=20409983

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/000080 WO1999037964A1 (en) 1998-01-23 1999-01-20 Method and means for drying

Country Status (2)

Country Link
SE (1) SE9800213L (en)
WO (1) WO1999037964A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003004953A1 (en) * 2001-06-18 2003-01-16 Maguire Products, Inc. Vacuum dryer
JP2011094101A (en) * 2009-09-29 2011-05-12 Canon Inc Method of drying organic pigment, method of processing phthalocyanine pigment, and method of manufacturing electrophotographic photosensitive member
CN109883144A (en) * 2019-01-30 2019-06-14 浙江机电职业技术学院 A kind of graphene powder water trap and go water method
US10539366B2 (en) 2014-04-30 2020-01-21 Stephen B. Maguire Method and apparatus for vacuum drying granular resin material
US11203133B2 (en) 2018-04-04 2021-12-21 Novatec, Inc. Method and apparatus for polymer drying using inert gas
US11364657B2 (en) 2018-04-04 2022-06-21 Novatec, Inc. Reducing moisture in granular resin material using inert gas

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330946A (en) * 1980-09-23 1982-05-25 Ralph S. Tillitt High efficiency material drying
US4347670A (en) * 1980-11-28 1982-09-07 Mcdonnell Douglas Corporation Apparatus and process for drying granular products
US4896434A (en) * 1988-11-10 1990-01-30 Joseph Fanelli Apparatus and method for drying gel
DE19609695A1 (en) * 1996-02-10 1997-08-21 Fzm Ges Fuer Produktentwicklun Combined microwave and vacuum drying method esp. for drying temperature-sensitive household ware

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330946A (en) * 1980-09-23 1982-05-25 Ralph S. Tillitt High efficiency material drying
US4347670A (en) * 1980-11-28 1982-09-07 Mcdonnell Douglas Corporation Apparatus and process for drying granular products
US4896434A (en) * 1988-11-10 1990-01-30 Joseph Fanelli Apparatus and method for drying gel
DE19609695A1 (en) * 1996-02-10 1997-08-21 Fzm Ges Fuer Produktentwicklun Combined microwave and vacuum drying method esp. for drying temperature-sensitive household ware

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003004953A1 (en) * 2001-06-18 2003-01-16 Maguire Products, Inc. Vacuum dryer
KR100898998B1 (en) * 2001-06-18 2009-05-21 머과이어 프로덕츠 인코포레이티드 Vacuum dryer
KR100945567B1 (en) * 2001-06-18 2010-03-08 머과이어 프로덕츠 인코포레이티드 Vacuum dryer
JP2011094101A (en) * 2009-09-29 2011-05-12 Canon Inc Method of drying organic pigment, method of processing phthalocyanine pigment, and method of manufacturing electrophotographic photosensitive member
US10539366B2 (en) 2014-04-30 2020-01-21 Stephen B. Maguire Method and apparatus for vacuum drying granular resin material
US11203133B2 (en) 2018-04-04 2021-12-21 Novatec, Inc. Method and apparatus for polymer drying using inert gas
US11364657B2 (en) 2018-04-04 2022-06-21 Novatec, Inc. Reducing moisture in granular resin material using inert gas
CN109883144A (en) * 2019-01-30 2019-06-14 浙江机电职业技术学院 A kind of graphene powder water trap and go water method

Also Published As

Publication number Publication date
SE9800213L (en) 1999-07-24
SE9800213D0 (en) 1998-01-23

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