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EP3610700A1 - Four à passage continu pour le chauffage de matériau au moyen de micro-ondes - Google Patents

Four à passage continu pour le chauffage de matériau au moyen de micro-ondes

Info

Publication number
EP3610700A1
EP3610700A1 EP18717610.2A EP18717610A EP3610700A1 EP 3610700 A1 EP3610700 A1 EP 3610700A1 EP 18717610 A EP18717610 A EP 18717610A EP 3610700 A1 EP3610700 A1 EP 3610700A1
Authority
EP
European Patent Office
Prior art keywords
plate
continuous furnace
carriers
radiation
holder
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.)
Withdrawn
Application number
EP18717610.2A
Other languages
German (de)
English (en)
Inventor
Volker Reichardt
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.)
Dieffenbacher GmbH Maschinen und Anlagenbau
Original Assignee
Dieffenbacher GmbH Maschinen und Anlagenbau
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 Dieffenbacher GmbH Maschinen und Anlagenbau filed Critical Dieffenbacher GmbH Maschinen und Anlagenbau
Publication of EP3610700A1 publication Critical patent/EP3610700A1/fr
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • 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
    • H05B6/80—Apparatus for specific applications

Definitions

  • the invention relates to a continuous furnace for heating material by means of microwaves according to claim 1.
  • the heat applied substantially from the outside whereby a complete penetration of the product to be manufactured with this heat can not always be guaranteed.
  • a heat distribution is to be ascertained in the heated press in which the core of a product also reaches a desired temperature, without critical temperatures already being exceeded during pressing on the areas lying further outside.
  • the use of microwaves has the advantage that no additional moisture is introduced into the material to be compacted during preheating.
  • the material Due to the additional moisture which is introduced with the Dampfvor-40rmsystemen, the material is to be dried prior to application to the conveyor belt such that the maximum moisture content of the material before pressing by adding moisture, such as steam, is not exceeded. This leads already in the pretreatment of the material to an intensive drying of the material and a high
  • Continuous furnace for heating the material can be dispensed with intensive drying of the material under maximum moisture in advance, which has a positive effect on the energy balance.
  • microwave ovens As they are used in the field of catering or in the household, is usually a hermetically demarcated
  • Treatment chamber is provided, which is to be sealed off to the outside with respect to the leakage of microwaves.
  • the material to be treated is irradiated to one for the radiation, in particular microwaves,
  • the problem here may be that the conveyor belt due to the
  • Microwave permeable plastic such as polypropylene, so that for homogeneous heating of the material and radiation below the Material and thus introduced below the floor area in the treatment room and can be absorbed by the material.
  • Such dissolved particles then settle within the treatment room, especially at exposed locations. Here form corresponding agglomerates. These can lead to malfunctions of various kinds, be it that they disturb a uniform distribution of microwaves within the treatment room, whether they grow and detach from a certain size and fall back on the material cake, what in this undesirable
  • the transparent to the radiation plate over which the conveyor belt runs should be made particularly solid with a corresponding thickness due to the width of the continuous furnace of up to 3.5 m, so that they are the burden of the Material resting on the conveyor belt also withstands.
  • the plate in the treatment room also warms up and due to the selected material of a strong
  • Thermal expansion may be subject. This can lead to a deformation de plate, which in turn affects the conveyor belt running above it and the material lying thereon and there can lead to a deformation of the present in the form of a mat or nonwoven material.
  • Another object of the present invention is to overcome the disadvantages mentioned above.
  • Another object of the present invention is to improve the distribution of
  • Yet another object of the present invention is to improve the transport of the material through the continuous furnace.
  • Yet another object of the present invention is to provide such
  • Continuous furnace for heating material by means of microwaves comprising a treatment space for heating the material, wherein in the treatment space, one or more openings for the introduction of radiation via waveguides in the
  • Treatment room are arranged and / or the microwave generator in
  • Treatment room are arranged directly, at least one endlessly circulating
  • Conveyor belt for transporting the material through the continuous furnace, and a plate over which the conveyor belt is pulled in the treatment room, wherein the plate is located on at least one or more carriers and / or the plate is overlapped or encompassed by a holder at its edges and / or the plate is made up of segments .
  • the invention is based on the finding that the support receives the support from the plate, as a result of which the plate can also be made thinner.
  • the carrier By means of the carrier, sagging of the plate can be prevented, so that the material, preferably present as fleece or mat, can be transported more uniformly and without bending through the continuous furnace.
  • the plate By resting the plate on the carriers, there is also a thermal connection between the carriers and the plate, whereby any occurring heat distribution fluctuations can be dissipated and the heat distribution can be homogenized as a whole.
  • the carriers between the microwave generators or the openings for the entry of the radiation into the treatment space and the plate, these can also influence and improve the distribution of the radiation in the treatment space, especially between the floor and the plate.
  • the invention is based on the finding that, in particular when using sheets made of plastic, which is microwave transparent, the
  • the supports preferably extend substantially parallel to one another and are arranged parallel to one another. Preferably, at least a part of the carriers are aligned perpendicular and / or parallel to the production direction.
  • the arrangement as well as orientation can be influenced by the width and the length of the continuous furnace.
  • the carriers do not run only at the edge of the floor areas, but in particular over the central areas bounded by the edges.
  • the carriers include a spacer and a rail, the rail being in contact with the plate.
  • the carriers are on the one hand not solid, whereby a better distribution of the radiation, in particular the microwaves, is achieved in the treatment room.
  • the spacer elements and the rails are made of the same material or of different materials.
  • Treatment room can be influenced by the choice of materials.
  • the materials can also be selected so that they specifically influence the distribution of the radiation in the treatment room.
  • the carriers do not cover the openings, so that they can release the radiation freely into the treatment room. Direct reflection of the radiation in the opening is thus avoided.
  • the said openings for microwaves are included preferably arranged in the areas between the above-mentioned parallel rails.
  • the carriers are arranged equidistant and thus distributed in the treatment room. This can be especially true for the distribution of radiation in the
  • a further embodiment provides that the carriers are formed from a material with low thermal expansion.
  • Low thermal expansion to mean in this case that the material of the carrier by direct heating by
  • Absorption of the radiation as well as by indirect heating via contact heat and / or heat radiation only slightly, preferably by less than 5%, especially by less than 3%, most preferably by less than 2%, in relation to the size at room temperature.
  • the supports are preferably constructed of a material which is transparent to the radiation or of a metallic material, for example of aluminum or steel.
  • Transparent materials for the radiation offer the advantage that they do not affect the distribution of the radiation in the treatment room, but, because they are mostly plastics, difficult to connect to the wall, in particular to the bottom of the continuous furnace.
  • Metallic materials can influence the radiation distribution, also positively.
  • a further embodiment is characterized in that the contact surface of the plate on the carriers is less than 20%, preferably less than 12%, particularly preferably less than 8%, most preferably less than 5%.
  • the contact surface of the plate on the carriers is less than 20%, preferably less than 12%, particularly preferably less than 8%, most preferably less than 5%.
  • the plate is overlapped or encompassed by a holder at its edges.
  • a holder By the holder bending of the plate, for example by thermal expansion or the like, is avoided.
  • the bracket which are usually made of steel or aluminum, also serves as a guide device for the plate. These Brackets also allow electrostatic charges on the
  • the holder forms with the plate
  • the brackets thereby overlap the edges of the plate, joints are also avoided at the edges, in which otherwise could accumulate particles and as pollution etc. can lead to malfunction.
  • the holder tapers in a wedge shape from the housing of the continuous furnace to the plate.
  • the running over the plate and the bracket conveyor belt can thus conform to the shape and angular transitions, which could lead to damage to the conveyor belt can be avoided.
  • a further embodiment is characterized in that the plate is mounted floating between the carrier and the holder.
  • the plate is free to expand, for example when heated by the material being heated and heated above it.
  • the plate is connected at a fixed point with the support or the holder or the housing of the continuous furnace.
  • the fixed point allows targeted control of the thermal expansion of the plate in one or more specific
  • Segments is constructed. Especially when building the system or even when changing the plate provides a segmented plate has the advantage that the individual segments can be removed and replaced separately.
  • the segments of the plate overlap and preferably have
  • the segments of the plate are interconnected, preferably via tongue and groove.
  • a kind of overlapping of the individual segments occurs due to the connection, on the other hand the stability of the plate as a whole is improved by the connection of the segments.
  • the segments of the plate can also be welded.
  • expansion joints are arranged between the segments.
  • the plate has a thickness of less than 30 mm, preferably less than 20 mm, particularly preferably less than 15 mm.
  • a thinner plate also allows for easier handling due to its lower weight.
  • Base plate and a wear plate which rests on the base plate includes. Due to the transport belt running over the plate, wear can occur on this plate.
  • the plate as a split plate comprising a base plate and a wear plate can be changed in a visible wear only the wear plate, wherein the base plate is arranged in a continuous furnace. The change of the plate can thus be done faster, reducing the downtime for such a change is shortened.
  • the wear plate is made thinner than the base plate. The change of the wear plate can thus be done without large equipment and fast.
  • the wear plate has a thickness of less than 8 mm, preferably less than 5 mm, particularly preferably less than 3 mm.
  • Fig. 1 is a schematic diagram of a device according to the invention.
  • FIG. 2 shows a partial view of the treatment space in perspective view
  • Fig. 4 is a partial view of a constructed of segments plate.
  • FIG. 1 shows a schematic diagram of a continuous furnace 4 for heating material 2, in particular lignocellulosic material 2, as it
  • Wood-based panels is used. Lignocellulosic material 2, like
  • the continuous furnace 4 comprises a treatment chamber 7, in which the material 2, which is present here in the form of a mat or a fleece, with radiation 5, in particular with
  • Microwave radiation is irradiated from below and / or above.
  • Conveyor belt 8 are covered, which runs at the same speed as the material 2 through the treatment chamber 7.
  • the upper transport belt 8, which rests on the material 2 on the one hand has the function of protecting the surface of the mat material 2 as it passes through the continuous furnace 4, and on the other hand, it also prevents particles, such as product fibers, Dust etc., easily detach from the surface of the material 2.
  • the radiation 5 is preferably introduced above and / or below the material 2 in order to ensure a uniform heating of the material 2.
  • the radiation 5 can be generated by means of microwave generators (not shown) outside the continuous furnace 4 and by means of waveguides
  • Openings 6 are coupled into the treatment chamber 7 of the continuous furnace 4.
  • the radiation 5 can also be generated within the treatment space 7 be, which can be dispensed waveguide and the corresponding openings 6.
  • the radiation generator for generating the radiation 5 within the treatment chamber 7 or the openings 6 for the entry of the radiation 5 into the treatment chamber 7 are preferably arranged at a distance from the material 2 around a spatial, in particular even, propagation of the radiation 5 in the complete treatment chamber 7 to enable.
  • absorption chambers 9 are arranged in the example shown here, which prevents that in the treatment chamber 7 introduced radiation 5, in particular
  • Continuous furnace 4 can escape.
  • the residual radiation which has not been absorbed by the material 2 is conducted onto absorption elements 17, for example water reservoirs or plates made of ceramic materials, at which the residual radiation is converted into heat and destroyed.
  • the lower conveyor belt 1 runs with its underside over a permeable plate 5 or microwaves plate 7, so that the lower conveyor belt 1, which is loaded with the weight of the mat, does not sag.
  • the distance between the openings 6 and the microwave generators and the continuous material 2 ensures that the radiation 5 in the
  • FIG. 2 shows a part of a cross section transverse to the production direction 3 through the treatment chamber 7 of the continuous furnace 4.
  • the present as a mat or nonwoven material 2 rests on the conveyor belt 1, which in the treatment room 7 on the plate 10 in the production direction 3, which into the picture plane, is moved.
  • the plate 10, which consists of a, for the entering into the treatment chamber 7 radiation 5 transparent material, lies on the carriers 1 1, which are supported on the bottom of the continuous furnace 4.
  • the carriers 1 1 are in
  • the carrier 1 1 with spacer 13 and rail 12 results in a better propagation possibility of the radiation 5 in the treatment chamber 7 and the radiation 5 is not channeled, for example, when using metallic carriers 1 1, between the carriers 1 1.
  • the carrier 1 1 and the spacers 13 and the rails 12 may be made of a metallic material, such as steel or aluminum, which also by the movement of the conveyor belt 1 on the plate 10 resulting charges can be dissipated.
  • Rails 12 and the spacer elements 13 also from a transparent material for the radiation 5, such as a plastic such as polyethylene or polypropylene, be constructed. Especially when using a transparent material for the radiation 5, such as a plastic such as polyethylene or polypropylene, be constructed. Especially when using a plastic for the radiation 5, such as a plastic such as polyethylene or polypropylene, be constructed. Especially when using a plastic for the radiation 5, such as a plastic such as polyethylene or polypropylene, be constructed. Especially when using a plastic.
  • Spacers 13 made of these materials proves the connection of these to the wall of the continuous furnace 4 as difficult.
  • the peripheral edges of the plate 10 are each overlapped by a holder 14, which has a portion which can also be seen as an overlap of the holder 14 with the plate 10, and which presses firmly on the top of said plate 10.
  • Groove areas can be compensated. By these joint areas are below the sections of the holder 14, they are also preserved from contamination.
  • the plate 10 is thus floating between the carriers 1 1 and the Bracket 14 stored and clamped and can expand freely here.
  • the overlap region of the holder 14 and the plate 10 is designed such that the plate 10 is always overlapped by the holder 14 and the plate 10 can extend below the holder 14.
  • the plate may be connected at a fixed point to the carrier 1 1 or the holder 14, so that the expansion can preferably take place in one direction, for example the production direction 3.
  • the possibility of expansion of the plate 10 below the holder 14 results in a change in the contact surface between the plate 10 and conveyor belt. 1 In particular, stresses within the plate 10 and bulges thereof are avoided in a strong expansion.
  • FIG. 3 shows a detail of the treatment space 7 in a perspective view, which shows the bottom plate of the continuous furnace 4 with the
  • Openings 6 and the carrier 1 1 shows.
  • the plate 10 which rests on the carriers 1 1, was omitted because of the overview. It can be seen in particular the transversely to the production direction 3 extending, as rails 12, which are mounted on spacer elements 13, formed carriers 1 1.
  • These rails 12 as well as the spacer elements 13 may be metallic and in a direct, electrically conductive contact with the plate 10. It is thus possible to compensate for the accumulating on this underside of the plate 10 electrostatic charges via an addition or removal of electrons.
  • the spacers 13 hold the mutually parallel rails 12 of the carrier 1 1 in a distance between the bottom of the continuous furnace 4 and the plate 10, so that the radiation 5 can propagate freely in this area.
  • openings 6 are provided through which guided via waveguides and generated from outside of the continuous furnace 4 magnetron radiation 5 is introduced into the treatment chamber 7.
  • the radiation 5 can distribute more evenly and thus occurs not only punctiform in a guided over the plate 10 2 material.
  • the carrier 1 1 are preferably evenly arranged, in particular with an equal distance, wherein the openings 6 are not covered by the carriers 1 1.
  • microwave generators may be arranged at intended locations, by means of which the radiation 5 is generated directly in the treatment space 7.
  • an embodiment of the plate 10 is shown, which is constructed of segments 15 which overlap in one area and allow continuous support of the conveyor belt 1 running over it.
  • the individual segments 15 rest on carriers 11, which in turn are constructed of spacer elements 13 and rails 12.
  • the segments 15 have segment lugs 16, which interlock the two segments 15 such that the individual segments 15 can expand to a certain extent when heated.
  • a sealing material can also be introduced, so that no material can penetrate into the space below the plate 10 or the segments 15 and possibly ignite.
  • the sealing material should be compressible so that it can be compressed with an expansion of the segments 15, without affecting the surface of the plate 10, for example, by leaking sealing material.
  • the plate 10 may be constructed of a plurality of segments 15.
  • the segments 15 may overlap in and / or across the direction of production 3, depending on their size.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

L'invention concerne un four à passage continu (4) pour le chauffage d'un matériau (2) au moyen de micro-ondes. Le four à passage continu comprend une chambre de traitement (7) servant à chauffer le matériau (2), une ou plusieurs ouvertures (6) servant à introduire le rayonnement (5) par l'intermédiaire de guides d'ondes dans la chambre de traitement (7) étant disposées dans la chambre de traitement (7) et/ou les générateurs de micro-ondes étant directement disposés dans la chambre de traitement (7) ; au moins une bande transporteuse (1, 8) tournant sans fin servant au transport du matériau (2) à travers le four à passage continu (4) ; et une plaque (10), par l'intermédiaire de laquelle la bande transporteuse (1, 8) est tirée dans la chambre de traitement (7). L'invention est caractérisée en ce que la plaque (10) se situe sur au moins un ou plusieurs supports (11) et/ou que la plaque (10) est recouverte ou encadrée au niveau de ses bords par une fixation (14) et/ou que la plaque (10) est élaborée à partir de segments (15).
EP18717610.2A 2017-04-13 2018-04-13 Four à passage continu pour le chauffage de matériau au moyen de micro-ondes Withdrawn EP3610700A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017108092.9A DE102017108092A1 (de) 2017-04-13 2017-04-13 Durchlaufofen zur Erwärmung von Material mittels Mikrowellen
PCT/EP2018/059504 WO2018189363A1 (fr) 2017-04-13 2018-04-13 Four à passage continu pour le chauffage de matériau au moyen de micro-ondes

Publications (1)

Publication Number Publication Date
EP3610700A1 true EP3610700A1 (fr) 2020-02-19

Family

ID=61972143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18717610.2A Withdrawn EP3610700A1 (fr) 2017-04-13 2018-04-13 Four à passage continu pour le chauffage de matériau au moyen de micro-ondes

Country Status (3)

Country Link
EP (1) EP3610700A1 (fr)
DE (1) DE102017108092A1 (fr)
WO (1) WO2018189363A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019112632B3 (de) * 2019-05-14 2020-11-19 Siempelkamp Maschinen- Und Anlagenbau Gmbh Vorrichtung zur kontinuierlichen Erwärmung einer Pressgutmatte

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473881A (en) * 1946-06-25 1949-06-21 Westinghouse Electric Corp High-frequency dielectric heating apparatus
DE1048652B (de) * 1956-02-02 1959-01-15 Aktiengesellschaft Brown, Boveri 6- Cie., Baden (Schweiz) Kapazitive Hochfrequenz-Erwärmungsanlage
CH438523A (de) * 1965-01-29 1967-06-30 Tappan Co Mikrowellenofen
US3749874A (en) * 1972-06-02 1973-07-31 Raytheon Co Microwave applicator
CA2079332A1 (fr) * 1990-03-30 1991-10-01 Jack Edgar Bridges Methode et appareil servant a traiter des dechets dangereux ou d'autres materiaux hydrocarbones
DE19718772B4 (de) 1997-05-03 2015-08-20 Dieffenbacher GmbH Maschinen- und Anlagenbau Verfahren und Anlage zur Herstellung von Holzwerkstoffplatten
DE10157601B4 (de) * 2001-11-26 2011-06-01 Dieffenbacher Gmbh + Co. Kg Vorrichtung zur Erwärmung von Pressgut bei der Herstellung von Werkstoffplatten

Also Published As

Publication number Publication date
WO2018189363A1 (fr) 2018-10-18
DE102017108092A1 (de) 2018-10-18

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