EP0824661A1 - Apparatus for heating and drying - Google Patents

Apparatus for heating and drying

Info

Publication number
EP0824661A1
EP0824661A1 EP96912383A EP96912383A EP0824661A1 EP 0824661 A1 EP0824661 A1 EP 0824661A1 EP 96912383 A EP96912383 A EP 96912383A EP 96912383 A EP96912383 A EP 96912383A EP 0824661 A1 EP0824661 A1 EP 0824661A1
Authority
EP
European Patent Office
Prior art keywords
tunnel
goods
drying
microwave
heating
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP96912383A
Other languages
German (de)
French (fr)
Inventor
Per Erik Gustafsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GISIP INNOVATIONS AB
Original Assignee
Cirrus 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 Cirrus AB filed Critical Cirrus AB
Publication of EP0824661A1 publication Critical patent/EP0824661A1/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • 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
    • F26B15/16—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 wheeled trucks
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/046—Microwave drying of wood, ink, food, ceramic, sintering of ceramic, clothes, hair

Definitions

  • the present invention is for an apparatus for heating and drying, wherein the desired results are mainly obtained by the use of microwaves.
  • Heating and drying wih microwaves brings with it considerable advantages but also special problems, especially when handling large objects and in large plants.
  • a great number of microwave generators are used, the function of which shall be monitored and controlled in several respects, for example the supply of energy per unit time and the temperature of the goods. It is also important that the microwaves cannot reach out of the apparatus and that other losses of energy as far as possible are avoided.
  • the present invention is for an apparatus for heating and drying which takes the shape of a tunnel having several microwave generators positioned along the tunnel.
  • Figure 1 shows an apparatus according to the invention and a conveyor car thereof.
  • FIG. 1 shows in principle the layout of the expended system according to the invention.
  • the apparatus shown in figure 1 has a tunnel 1 with opening sections 5 and 6.
  • the goods which shall be treated is conveyed through the tunnel on a car 2 and in the example shown in the figure this goods is timber which is conveyed through the apparatus for drying.
  • the car 2 has in one of its ends a gable wall 7 which includes a board that is impermeable to the microwaves.
  • the gable is surrounded by a frame 8 having microwave baring properties and an outer dimension which is close to the inner dimensions of the tunnel.
  • the tunnel 1 in the whole has a constant cross section.
  • Microwave generators 3 A-C, 4 A-C are positioned along the tunnel at both sides thereof.
  • the distance between consecutive microwave generators and the length of the cars can be selected in a desired relationship to each other, when the respective units are designed and manufactured.
  • the microwave generators suitably are equipped with individual control devices and, therefore, the energy supplied to each section can be carefully controlled.
  • the gable walls also have a function to divide the tunnel into several separate spaces or zones, wherein the conditions can be individually controlled, for example by ventilation. This is obtained by means of fans 12 and one may hereby in known ways make use of the cooling air from the microwave generators. For some applications it is also possible to arrange separate cooling fans, by which air from the surroundings is blown into some sections of the tunnel.
  • the cars onto which the goods is conveyed through the tunnel are individually designed for different applications. Besides the application of timber drying already mentioned, this kind of devices may also be used for drying of painted or laquered objects and for other purposes.
  • the goods can be conveyed through the tunnel by means of different kinds of conveyors, for example chain or wire conveyors which preferably are arranged in the floor or the ceiling of the tunnel.
  • the gable walls are then designed so that they instead follow the conveyor, being permanently or detachably mounted thereto.
  • the plant as shown in figure 2 has three adjacent tunnels 1, 10 and 11. At right angle to the tunnel 1 there is an inflow section 9, wherein the cars are positioned across the length of the section waiting to be conveyed into the tunnel.
  • This plant shows as an example the flexibility and possibilities in the layout of a heating and drying apparatus according to the invention.
  • the individual cars or corresponding sections of a conveyor may carry microwave impermeable gables at both ends. They may also be made as containers in which the goods to be treated is placed. The goods may then be comparatively small units and it may also have irregular shape and size.
  • the containers are made from a suitable material for this purpose, for example such as is only to a minor extent affected by the microwaves and thus is not heated by direct influence from them.

Abstract

The present invention is for an apparatus for heating and drying which takes the shape of a tunnel having several microwave generators positioned along the tunnel. There are also arrangements for continuous conveyance of goods through the tunnel. The goods which shall be treated is conveyed through the tunnel on a car (2). The car (2) has in one of its ends a gable wall (7) which includes a board that is impermeable to the microwaves. The gable is surrounded by a frame (8) having microwave barring properties and an outer dimension which is close to the inner dimensions of the tunnel. The tunnel (1) in the whole has a constant cross section.

Description

Apparatus for heating and drying
The present invention is for an apparatus for heating and drying, wherein the desired results are mainly obtained by the use of microwaves. Heating and drying wih microwaves brings with it considerable advantages but also special problems, especially when handling large objects and in large plants. In such plants a great number of microwave generators are used, the function of which shall be monitored and controlled in several respects, for example the supply of energy per unit time and the temperature of the goods. It is also important that the microwaves cannot reach out of the apparatus and that other losses of energy as far as possible are avoided.
The present invention is for an apparatus for heating and drying which takes the shape of a tunnel having several microwave generators positioned along the tunnel. There are also arrangements for continuous conveyance of goods through the tunnel which by being divided into section makes it possible to recondition the goods between sections having microwave heating.
The invention will below be described more in detail with reference to the examples of embodiments of the invention which are shown in the enclosed figures.
Figure 1 shows an apparatus according to the invention and a conveyor car thereof.
Figure 2 shows in principle the layout of the expended system according to the invention.
The apparatus shown in figure 1 has a tunnel 1 with opening sections 5 and 6. The goods which shall be treated is conveyed through the tunnel on a car 2 and in the example shown in the figure this goods is timber which is conveyed through the apparatus for drying. The car 2 has in one of its ends a gable wall 7 which includes a board that is impermeable to the microwaves. The gable is surrounded by a frame 8 having microwave baring properties and an outer dimension which is close to the inner dimensions of the tunnel. The tunnel 1 in the whole has a constant cross section.
When the goods is conveyed through the tunnel carried by cars having microwave impermeable gables, the tunnel is thereby divided into sections. Microwave generators 3 A-C, 4 A-C are positioned along the tunnel at both sides thereof. The distance between consecutive microwave generators and the length of the cars can be selected in a desired relationship to each other, when the respective units are designed and manufactured. The microwave generators suitably are equipped with individual control devices and, therefore, the energy supplied to each section can be carefully controlled.
The gable walls also have a function to divide the tunnel into several separate spaces or zones, wherein the conditions can be individually controlled, for example by ventilation. This is obtained by means of fans 12 and one may hereby in known ways make use of the cooling air from the microwave generators. For some applications it is also possible to arrange separate cooling fans, by which air from the surroundings is blown into some sections of the tunnel.
The cars onto which the goods is conveyed through the tunnel are individually designed for different applications. Besides the application of timber drying already mentioned, this kind of devices may also be used for drying of painted or laquered objects and for other purposes. Instead of cars the goods can be conveyed through the tunnel by means of different kinds of conveyors, for example chain or wire conveyors which preferably are arranged in the floor or the ceiling of the tunnel. The gable walls are then designed so that they instead follow the conveyor, being permanently or detachably mounted thereto.
The plant as shown in figure 2 has three adjacent tunnels 1, 10 and 11. At right angle to the tunnel 1 there is an inflow section 9, wherein the cars are positioned across the length of the section waiting to be conveyed into the tunnel. This plant shows as an example the flexibility and possibilities in the layout of a heating and drying apparatus according to the invention.
The apparatus and devices may within the scope of the invention be varied in various respects. For example, the individual cars or corresponding sections of a conveyor may carry microwave impermeable gables at both ends. They may also be made as containers in which the goods to be treated is placed. The goods may then be comparatively small units and it may also have irregular shape and size. The containers are made from a suitable material for this purpose, for example such as is only to a minor extent affected by the microwaves and thus is not heated by direct influence from them.

Claims

1) Apparatus for heating and drying, comprising a tunnel having in the whole a constant cross section and several microwave generators positioned along the tunnel, and devices for continuous conveyance of goods through the tunnel, characterized therein, that the tunnel 1 is divided into sections by microwave impermeable gable walls (7), which follow the conveyance of the goods through the tunnel.
2) Apparatus according to claim 1, characterized therein, that the goods is conveyed on cars, whereby each car also carries a gable wall (7) which divides the tunnel.
3) Apparatus according to claim 1, characterized therein, that the goods is conveyed by means of chain or wire conveyor which also carries the dividing walls (7).
4) Apparatus according to one of the preceding claims, characterized therein, that each dividing wall (7) has a microwave baring frame (8) closely adjacent to the inside of the tunnel (1).
EP96912383A 1995-04-26 1996-04-25 Apparatus for heating and drying Ceased EP0824661A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9501557A SE505678C2 (en) 1995-04-26 1995-04-26 Heating and drying device
SE9501557 1995-04-26
PCT/SE1996/000553 WO1996034241A1 (en) 1995-04-26 1996-04-25 Apparatus for heating and drying

Publications (1)

Publication Number Publication Date
EP0824661A1 true EP0824661A1 (en) 1998-02-25

Family

ID=20398108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96912383A Ceased EP0824661A1 (en) 1995-04-26 1996-04-25 Apparatus for heating and drying

Country Status (5)

Country Link
EP (1) EP0824661A1 (en)
AU (1) AU5521196A (en)
NO (1) NO309210B1 (en)
SE (1) SE505678C2 (en)
WO (1) WO1996034241A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE517608C2 (en) * 1999-03-22 2002-06-25 Leif Goesta Zettergren Procedure for heat treatment
BE1015246A6 (en) * 2002-12-11 2004-12-07 Hoebeek Nv Industrial microwave for thermal treatment of products and method applied thereby more special for killing insects in wood.
DE10323809B4 (en) * 2003-05-23 2015-07-30 Dct Dry Control Technologies Gmbh & Co.Kg Method and device for applying or supplying sprayable sealants or adhesives
FR2915560A1 (en) * 2007-04-24 2008-10-31 Jacques Louis Auguste Soux Microwave drying tunnel for organic or mineral materials, has microwave generators arranged on successive frames and performing drying and dehydration of organic or mineral materials that are linearly routed inside tunnel by conveyor belt
DK3433430T3 (en) 2016-03-23 2022-09-05 Alm Holding Co BATCH ASPHALT MIXING PLANT

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB851109A (en) * 1959-07-15 1960-10-12 Mullard Ltd High-frequency ovens
US4182946A (en) * 1977-11-28 1980-01-08 Cober Electronics, Inc. Method and apparatus for eliminating microwave leakage at the conveyor portal of a microwave oven

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9634241A1 *

Also Published As

Publication number Publication date
WO1996034241A1 (en) 1996-10-31
AU5521196A (en) 1996-11-18
NO974848L (en) 1997-10-21
SE505678C2 (en) 1997-09-29
SE9501557D0 (en) 1995-04-26
SE9501557L (en) 1996-10-27
NO309210B1 (en) 2000-12-27
NO974848D0 (en) 1997-10-21

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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STAA Information on the status of an ep patent application or granted ep patent

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Effective date: 20011206