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WO2019170300A1 - Four à passage continu et installation de fabrication de plaques de matériau en bois - Google Patents

Four à passage continu et installation de fabrication de plaques de matériau en bois Download PDF

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Publication number
WO2019170300A1
WO2019170300A1 PCT/EP2019/050240 EP2019050240W WO2019170300A1 WO 2019170300 A1 WO2019170300 A1 WO 2019170300A1 EP 2019050240 W EP2019050240 W EP 2019050240W WO 2019170300 A1 WO2019170300 A1 WO 2019170300A1
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WO
WIPO (PCT)
Prior art keywords
antenna
continuous furnace
waveguide
antennas
mat
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
PCT/EP2019/050240
Other languages
German (de)
English (en)
Inventor
Tobias Marx
Klaus-Peter Schletz
Klaus Gartz
Armin Rapp
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.)
Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Original Assignee
Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
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
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Application filed by Siempelkamp Maschinen und Anlagenbau GmbH and Co KG filed Critical Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Publication of WO2019170300A1 publication Critical patent/WO2019170300A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H05B6/788—Arrangements for continuous movement of material wherein an elongated material is moved by applying a mechanical tension to it
    • 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
    • H05B6/70—Feed lines
    • H05B6/701—Feed lines using microwave applicators
    • 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
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides
    • H05B6/708—Feed lines using waveguides in particular slotted waveguides
    • 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 invention relates to a continuous furnace for continuous heating (in particular preheating) of a pressed material mat, in particular in the course of (continuous) production of wood-based panels, with a tunnel-shaped housing through the interior of which the pressed material mat can be passed and with one or more microwave generators for generating microwaves that z. B. can be irradiated via one or more waveguides in the interior of the housing.
  • Pressgutmatte means in the context of the invention preferably a mat or web of material (glued) particles, z.
  • chips or fibers preferably wood chips or wood fibers in the course of the production of wood-based panels.
  • the particles, z. As wood chips or wood fibers, usually sprinkled with a spreader on a scatter belt conveyor or the like to form a pressed material mat and the pressed material mat thus produced then passes through a press, in particular a continuously operating press, the z. B. may be formed as a double belt press.
  • the pressed material mats are pressed using pressure and / or heat to form a plate or a strand of sheet, in particular a wood-based material plate (eg chipboard or fiberboard).
  • a preheating of the material to be pressed or of the material to be pressed takes place by means of a press material mat preheating device, which is designed as a microwave continuous furnace.
  • the Pressgutmatte is therefore preheated by means of microwave radiation.
  • Microwave radiation means according to the invention electromagnetic
  • microwave radiation in a frequency range of 100 MHz to 300 GHz, preferably 300 MHz to 100 GHz. Particularly preferred is conventional microwave radiation having a frequency of 900 to 950, z. B. about 915 MHz or a frequency of about 2.4 to 2.5 GHz, z. B. about 2.45 GHz used.
  • the microwave radiation is in one or more microwave generators, z. B. magnetrons, generated and preferably irradiated via waveguides in the interior of the housing or coupled.
  • a continuous furnace for continuous preheating a pressed material mat of the type described above is z. B. from EP 2 247 418 B1. Microwaves in a frequency range from 2400 to 2500 MHz are used to heat the pressed material mat, the microwaves for each pressed surface side from 20 to 300 magnetron microwave generators having a power of 3 to 50 kW being produced.
  • the inlet and the outlet of the continuous furnace should be made variable in height and / or width.
  • To change the inlet or outlet movable absorption elements may be provided, for. B. absorber stones and / or water tank.
  • DE 697 37 417 T2 describes an apparatus and a method for the production of products made of wood or wood fibers, wherein microwaves are used for preheating a binder. In particular, veneer wood should be produced.
  • the German Utility Model DE 20 2015 102 422 U1 describes an apparatus for continuously heating materials of the substantially non-metallic material, comprising a continuous furnace for the continuous heating of material on an endlessly circulating conveyor belt, wherein the continuous furnace, a plurality of magnetrons for generating electromagnetic waves and waveguides with
  • WO 2008/067996 A1 discloses a microwave heating device which is designed in particular for ceramic materials and molded parts and has a plurality of microwave generators for emitting microwaves with a frequency of 300 MHz to 5.8 GHz.
  • the coupling of the high and low frequency microwaves is carried out via several in the ceiling and the bottom portion of the drying chamber recessed coupling elements. These should be slot antennas tuned to the output frequency.
  • the arrangement of several field guides in the ceiling area of the drying chamber is provided.
  • the focus of this publication lies in the industrial drying of ceramic materials and mineral insulation materials. These considerations had no influence on the design of preheating devices for the wood-based panel industry.
  • a continuous furnace for continuous heating of a pressed material mat of the type described above is z. B. from DE 10 2016 110 808 A1, wherein the tunnel-shaped housing is oval in cross-section and preferably has a width which is greater than the height.
  • the housing may be formed in cross-section substantially elliptical.
  • Microwaves can be radiated into the interior via coupling windows, wherein these coupling windows of the housing are arranged on the oval circumference of the housing and optionally distributed along the length of the housing.
  • the microwave generators may also be arranged separately at a distance from the housing and connected with waveguides to the housing or the coupling window.
  • DE 100 846 93 T1 describes a plant and a method for producing a compressed wood product, which consists of several interconnected veneer strips.
  • the veneer strips can be joined together in a press using pressure and heat, waveguides being provided between individual press rolls for irradiating microwaves into the product.
  • the waveguides can be provided with longitudinal slot openings.
  • the invention is based on the invention of providing a continuous furnace with which a press material mat, in particular for the production of wood-based panels, can be heated efficiently and economically and in particular preheated for a continuous pressing process.
  • the invention teaches in a generic continuous furnace of the type described above, in or on the housing one or more waveguide slot antennas are arranged in a (the Pressgutmatte facing) antenna wall in each case a plurality along the antenna longitudinal direction distributed outlet slots for the emission of microwaves in the interior (ie on the Pressgutmatte), wherein the tunnel-shaped housing one above the Pressgutmatte (or Pressgutmattenebene) arranged (preferably straight / even top wall
  • the side walls are cylindrical shell-shaped, d. H. they have a circular or part-circular cross-section, wherein the cylinder axis is oriented parallel to the passage direction. It is expedient if the side walls are not formed by respective cylinder half-shells, but only smaller cylinder segments, wherein the segment angle 10 ° to 180 °, preferably 20 ° to 90 °, z. B. can be 30 ° to 60 °.
  • the curvature of the side walls is adapted to the wavelength of the microwave radiation and / or to the waveguide wavelength of the waveguide slot antennas.
  • the radius of curvature is 0.5 times to 3 times the wavelength (or waveguide wavelength), z. B. 1, 5 times the wavelength of the microwaves (or the waveguide wavelength).
  • the invention is based initially on the realization that with microwaves a particularly efficient and economical heating of a pressed material mat and in particular a preheating of a pressed material mat in the course of the production of wood-based panels can be achieved when the microwaves via waveguide slot antennas in the interior of the continuous furnace and consequently be radiated onto the pressed material mat.
  • the microwaves are thus coupled by the microwave generators in a basically known manner via waveguides in the interior of the housing, said waveguide, however, according to the invention at least partially formed as a waveguide slot antennas (each) a slot antenna section each having a plurality of exit slots for coupling
  • a waveguide is a waveguide for electromagnetic waves (here: microwaves).
  • the waveguide is designed as a metal tube with preferably rectangular (possibly also circular or elliptical) cross-section.
  • Such waveguides are used in the prior art for the transport of the microwave generated in the microwave generator in the oven when the microwave generators are not directly connected to the housing.
  • the invention proposes that the waveguides (at least in sections) are formed as waveguide slot antennas, each having a plurality have exit slots in the antenna wall.
  • the waveguide or the waveguide slot antenna end and closed at the end facing away from the microwave generator with an end wall. Consequently, the microwaves do not emerge from the waveguide on the face side, but instead they are emitted via a longitudinal wall, the so-called antenna wall, of the waveguide slot antennas, specifically through the outlet slots arranged there.
  • the microwaves thus enter the waveguide or the waveguide slot antenna on the side facing the microwave generator and are reflected on the opposite closed end or end wall so that a standing wave with the so-called waveguide wavelength is formed inside the waveguide slot antenna, ie two are formed Vibration bellies per waveguide wavelength.
  • the field produced in this way is greatly disturbed by the slots introduced in the antenna wall and by this disturbance the field emerges from the
  • Waveguide slot antenna and spreads out of these in the room, d. H. in the interior of the furnace.
  • the invention is based on the finding that in the conventional irradiation on the frontally open waveguide upon entry of the microwaves in the interior of the furnace housing reflections arise and the radiation enters the interior non-directionally, so that uneven heating occurs.
  • a directional irradiation of the pressed material mat takes place via the waveguide slot antenna, ie the amount of energy introduced is directed onto the pressed material mat and reflections are avoided.
  • the "illumination" of a pressed material mat is improved.
  • Such slot antennas are known in communication technology in principle to address certain sectors of a service area evenly and selectively radio technology.
  • the invention transmits such considerations to the field of microwave heating of pressed stock mats for the woodworking industry in particular.
  • the waveguide slot antennas (each) have a rectangular cross-section.
  • the waveguide slot antenna extends along a longitudinal direction so that the waveguide slot antenna forms a predetermined length of the waveguide, this slot antenna section having an antenna wall extending along the antenna longitudinal direction in which the exit slits are arranged.
  • the waveguide can also have a (conventional) waveguide section without slots. Starting from the microwave generator, the waveguide can consequently initially have a waveguide section without slots and a slot antenna section with slots adjoining it.
  • the waveguide (with waveguide section and antenna section) can extend straight in one direction and with a substantially identical cross section. However, it is also within the scope of the invention that the waveguide section or a waveguide section in a different direction
  • the invention proposes the previously described curved side walls of the furnace. Surprisingly, the illumination of the mat passing through the interior of the oven can be optimized and evened by such a geometry, so that a uniform heating is achieved in a particularly efficient manner, in combination with the inventive irradiation via waveguide slot antennas. It is within the scope of the invention to provide a unitary box-shaped housing for the continuous furnace, which has a (non-curved) top wall and a (not curved) bottom wall and two curved according to the invention side walls, wherein in such a box-shaped housing preferably more slot antennas along the direction of passage are distributed.
  • irradiation can only be realized from above or irradiation only from below.
  • irradiation is realized both from above and from below.
  • the tunnel-shaped housing a plurality of box-shaped individual cavities each with (not curved)
  • connection tunnel (not curved) bottom wall, side walls and end walls, wherein between the end walls of the individual cavities in each case a connection tunnel is arranged, passes over the mat from one cavity to the other, wherein the connection tunnel preferably has a relation to the individual cavities reduced height.
  • one or more possibly obliquely oriented waveguide slot antennas are arranged according to the invention.
  • some, more preferably all side walls of these individual cavities are equipped with curved side walls.
  • a plurality of slot antennas arranged directly behind one another in the housing. It is basically within the scope of the invention to provide in each individual cavity only a single slot antenna or even a single upper slot antenna and a single lower slot antenna. However, it is also possible to provide in a single cavity or in each cavity in each case at least two slot antennas arranged directly behind one another, which are then preferably arranged at different heights, that is, with an oblique arrangement of the individual cavities, for design reasons. H. are arranged at different distances to the pressed material mat along the emission direction.
  • matte types either one or more waveguide slot antennas with a first emission characteristic or one or more waveguide slot antennas are operated with a second emission characteristic.
  • the continuous furnace can therefore constructively provide different types of antennas, which can optionally be switched on or switched off.
  • These types of antenna can be z. B. differ in terms of their distribution and / or geometry of the slots, d. H. Slot antennas with a different distribution and / or a different geometry of the slots can be provided, which can optionally be switched on or switched off.
  • a plurality of slot antennas each having the same length (ie equal length of the antenna portion) and also each having the same slot length and preferably also used with the same distance of the slots along the longitudinal direction.
  • the slot antennas have a different number of slots.
  • slots with identical slot length and identical spacing along the longitudinal direction are particularly preferably distributed over a different length section of the slot antenna. In this way, it is very easy to achieve optimum adaptation to different mat widths by selecting the respectively appropriate slot antenna, because at
  • the slots In a first type of antenna, the slots extend over a first overall width and, in the case of a second type of antenna, only a reduced total width, but with otherwise identical geometry.
  • each individual cavity in each case a plurality of slot antennas with different emission characteristics are arranged, for. B. with different geometry of the antenna wall and particularly preferably with the same length and the same slot length but different number of slots, the slots are preferably distributed in all antennas at an identical distance along the longitudinal direction over a different length of the waveguide slot antenna.
  • Each individual cavity thus provides at least two different types of antennas, so that in each individual cavity an antenna for a particular type of mat can be connected.
  • the slots are oriented with their slot longitudinal direction parallel to the antenna longitudinal direction.
  • the length of the slots may be appropriately adjusted in consideration of the wavelength of the microwave radiation. It is preferably provided that the length of the slots along the antenna longitudinal direction (approximately) corresponds to half the waveguide wavelength. Taking into account the wavelengths preferably used, it is expedient if the length of the slots about 50 mm to 200 mm, z. B. 100 mm to 200 mm.
  • the invention provides that the waveguide slot antennas have a relatively large distance from the surface of the pressed material mat, so that in fact a flat wave field can form in the region of the pressed material mat and so a particularly uniform heating is realized.
  • the distance between the waveguide slot antenna (or the antenna wall) from the pressed material mat (along the emission direction) is greater than the wavelength of the microwave radiation used or the waveguide wavelength.
  • the distance is greater than 100 mm, preferably greater than 200 mm, z. B. greater than 400 mm.
  • the waveguide slot antennas protrude into the interior of the housing, ie they break through the housing wall, in particular the side wall. They therefore do not end with the entry into the housing, but they extend through the housing wall and protrude as a waveguide slot antennas into the housing, so that they are located above and / or below the Pressgutmatte and
  • the waveguide slot antennas can be connected to the outside of the housing or be attached to the outside of the housing, z. B. be placed on the top wall and / or the bottom wall, in which case the antenna wall may optionally be formed by a portion of the top wall or the bottom wall.
  • the invention also relates to a plant for the production of wood-based panels, in particular fiberboard or chipboard, chipboard also includes OSB boards.
  • a plant for the production of wood-based panels, in particular fiberboard or chipboard, chipboard also includes OSB boards.
  • Such a plant has a spreading device for producing a pressed material mat and a continuously operating press in which the pressed material mat is pressed using pressure and / or heat to the wood-based material board.
  • a continuous furnace of the type described is arranged between the scattering device and the press.
  • FIG. 1 shows a plant for the production of wood-based panels with a
  • FIG. 3 shows a section A-A of FIG. 2
  • FIG. 4 is a plan view of the article of FIG. 3,
  • Fig. 5 is a continuous furnace according to FIG. 2 in a modified
  • 6a, 6b show a simplified (comparative) side view of the embodiments according to FIGS. 2 and 5 in comparison,
  • Fig. 8 is a slot wall of a Flohlleiterschlitzantenne in a plan view.
  • Fig. 1 is simplified a system for Fier ein of Flolzwerkstoffplatten shown in a continuous flow.
  • This plant has a spreading device, not shown, with which the grit to be compacted (eg Flolzmaschinen or Flolzs fondne) to form a grit mat or
  • Pressgutmatte 1 is sprinkled on a scatter belt conveyor 2.
  • the pressed material mat 1 produced in this way is pressed in a continuously operating press 3 with the application of pressure and heat to a fluted material plate (eg chipboard or fiberboard).
  • a press 3 is generally designed as a double-belt press having an upper heating plate and a lower heating plate and in the press upper part and in the lower press part endlessly circulating press belts (eg., Steel press belts), said
  • Press belts with the interposition of WälzSystemaggregaten (eg., Roll bars) are supported on the press plates / heating plates.
  • One of the heating plates or both heating plates are loaded with pressing cylinders which are supported on the press frame (eg on press frame).
  • a preheating of the pressed material mat 1 takes place with the aid of a continuous furnace 4 merely indicated in FIG. 1.
  • a continuous furnace 4 which has a tunnel-shaped housing 5.
  • the continuous furnace 4 a plurality of microwave generators 6, with which microwaves are generated, so that the pressed material 1 mat in the interior 7 of the housing 5 is applied with microwaves and heated.
  • the microwave generators 6 can be magnetrons or the generators can have such magnetrons.
  • the microwave generators 6 are connected via waveguide 8 to the housing 5, so that the microwaves are irradiated via the waveguide 8 in the interior 7 of the housing 5.
  • Fig. 1 shows a first embodiment of a continuous furnace 4 with a uniform tunnel-shaped housing, which consists only of a single cavity.
  • the tunnel-shaped housing 5 consists of several in the direction of passage D successively arranged box-shaped Einzelkavticianen 5a.
  • the tunnel-shaped housing 5 or their individual cavities 5a each have an upper wall 10, a lower wall 11, side walls 12 and an input-side end wall 13 and an output-side end wall 14.
  • the pressed material mat passes through an entrance tunnel 15 into the housing 5 and consequently into the first single cavity 5a
  • connection tunnel 17 is arranged in each case.
  • the entrance tunnel 15, the exit tunnel 16 and the connection tunnel 17 each have a reduced height compared to the individual cavities 5a.
  • the inlet tunnel 15, the outlet tunnel 16 and the connecting tunnel 17 have the same width as the housing 5 or the individual cavities 5a.
  • at least the inlet tunnel 15 and the outlet tunnel 16 preferably have a reduced width relative to the housing 5 or the individual cavities 5a. They are preferably carried out only as broad as is necessary due to the goal of maximum damping and constructive needs.
  • the connection tunnels can optionally have a width that deviates from the housing or the individual cavities, for example. B for constructive or technological reasons.
  • the pressed material mat 1 passes through the continuous furnace 4 on a forming belt or conveyor belt 18, which consists of a non-conductive material, so that it can be easily passed through the microwave oven 4 during operation. In principle, this can be the same forming belt onto which the pressed material mat is sprinkled. However, it is also within the scope of the invention to provide a separate, endless circulating mold belt 18 through the continuous furnace 4.
  • the irradiation of the microwaves into the interior space 7 or onto the pressed material mat takes place with the aid of waveguide slot antennas 8a, 8b.
  • These slot antennas 8a, 8b are formed by the end-side portions and thus slot antenna portions 8a, 8b of the waveguides 8.
  • the slot antennas 8a, 8b or the antenna section 8a, 8b of the waveguide 8 thus has a length L, wherein in this longitudinal section with the length
  • the outlet slots 9 are arranged.
  • the outlet slots 9 are arranged in a wall, namely in the antenna wall 19.
  • the waveguide or waveguide slot antennas 8a, 8b have a rectangular cross section, with the antenna wall 19 having the outlet slots 9 (and the opposite wall) having a greater width B than the walls extending transversely thereto, which have a width or height H. respectively.
  • the width B of the waveguide slot antennas as well as the waveguide is approximately 1.5 to 2 times the height H.
  • the end wall 20 closes the waveguide slot antennas 8a, 8b at the end of the waveguide 8 opposite the microwave generator 6.
  • the slits 9 introduced into the antenna wall 19 are shown in FIG. It can be seen that such a slot antenna 8a, 8b or its antenna wall 19 has (at least) two rows of slots 9 ' running parallel to one another, each having a plurality of slots 9 arranged spaced apart from one another.
  • the two rows of slots 9 ' are arranged at a distance A to each other and the individual slits 9 in a series of slots 9' are arranged with a distance a behind the other.
  • the slots 9 of the two rows 9 ' along the longitudinal direction of the waveguide offset from one another.
  • the two rows of slots 9 ' are arranged offset from the center line X of the antenna wall 19, ie they have a distance V as an offset to the center line X.
  • the slots 9 themselves have a length I, wherein the length I of the slots in the embodiment parallel to the longitudinal direction of the waveguide slot antennas
  • FIGS. 1 and 2 show embodiments in which the box-shaped housing 5, 5a are oriented substantially with a horizontal (planar) top wall 10 and a horizontal (flat) bottom wall 11 and with the top wall and bottom wall parallel to Pressgutmattenebene P.
  • the waveguide slot antennas 8a are oriented with their antenna longitudinal direction transversely and preferably perpendicular to the passage direction D and, moreover, the antenna longitudinal direction is oriented parallel to the pressed material mat plane P. Incidentally, in the embodiments according to FIGS.
  • the waveguide slot antennas are oriented parallel to the passage direction D such that the radiation direction R of the waveguide slot antennas 8a, 8b oriented perpendicularly to the antenna wall is vertical and therefore below one Angle a of 90 ° to the passage direction D is oriented.
  • FIG. 5 an embodiment is shown in which the waveguide slot antennas 8 a, 8 b are oriented obliquely to the passage direction D that the oriented perpendicular to the antenna wall 19
  • Radiation direction R of the slot antennas is oriented obliquely at a different angle from 90 ° to the passage direction D.
  • the slot antennas 8a, 8b are oriented with their antenna longitudinal direction (along the length L) transversely and preferably perpendicular to the passage direction D. Furthermore, the slot antennas 8a, 8b are oriented with their antenna longitudinal direction parallel to the press material mat plane P. Furthermore, it can be seen that the housing sections or the individual cavities 5a are oriented in a corresponding manner obliquely at an angle a ' to the passage direction D. This means that both the input-side end wall 13 and the
  • each Einzelkavtician 5a are obliquely oriented at an angle other than 90 ° a 'to the traveling direction D.
  • the angles a and a ' are identical, ie the inclination of the antennas 8a, 8b is predetermined by the inclined position of the cavities 5a.
  • FIGS. 6a and 6b show in simplified form the effects or advantages achieved by the inclination.
  • FIG. 6a shows a vertical orientation (in accordance with FIG. 2) of the slot antennas 8a, 8b and thus vertical irradiation of the microwaves
  • FIG. 6b shows the oblique position of the slot antennas 8a, 8b and thus the oblique irradiation of the microwaves in the press material mat 1 relative to FIG the working direction D (according to FIG. 5). It can be seen that on the one hand in the variant according to the invention according to FIG.
  • the microwave field passes through a longer section of the press material mat 1 and on the other hand that the microwave field does not extend exclusively transversely, but also with a directional component in the direction of the press material mat longitudinal direction or the working direction, so that the microwaves propagate with their horizontal propagation component with the passage direction D or opposite passage direction D.
  • FIG. 8 An embodiment is shown in each individual cavity 5a a plurality of slot antennas 8a, 8b are provided, in each case at least one slot antenna 8a, 8b above the Pressgutmatte 1 and a slot antenna 8a, 8b below the Pressgutmatte 1 (or Pressgutmattenebene P), so that
  • slot antennas 8a, 8b with different emission characteristics are arranged in the continuous furnace, namely with different geometry of the antenna wall 19.
  • slot antennas 8a of a first type with a first emission characteristic and on the other hand slot antennas 8b provided with a second geometry and thus a second emission characteristic, the z. B. can be arranged alternately in the housing 5 along the direction of passage.
  • 5 shows an embodiment in which one or more slot antennas 8a of the first type and one or more slot antennas 8b of the second type are provided in each individual cavity 5a.
  • FIGS. 7a and 7b show, on the one hand, the slot antennas 8a of the first type and, on the other hand, the slot antennas 8b of the second type and the emission characteristics respectively achieved therewith, so that with the antennas 8a compressed material mats of a first (larger width) and with the antennas 8b press material mats of a second, smaller width are processed.
  • the two antenna types 8a, 8b each have outlet slots 9 with identical slot length I and also identical spacing and otherwise identical geometry according to FIG. 8.
  • the types 8a, 8b differ only in that the slots 9 in the two types over a different length section A1, A2 of the slot antenna
  • the slots 9 or the rows of slots 9 ' extend over the length section A1
  • the slots 9 or the row of slots 9 ' in the antenna 8b according to FIG 7b extend only over the longitudinal section A2 which is reduced in relation to A1, namely with otherwise identical slot row geometry and slot geometry and in particular the same length L of the antennas and also the same width of the cavities or of the housing.
  • the antenna 8b according to FIG. 7b it is possible with the antenna 8b according to FIG. 7b to irradiate a pressed material mat having a reduced width, without any unwanted overheating of the mat taking place in the edge regions.
  • this aspect of the invention can be realized not only in the slanted slot antennas and inclined housings, but also in other embodiments.
  • antennas 8a and on the other hand antennas 8b may also be provided in the embodiment according to FIG. 2, as shown in FIG.
  • each cavity 5a has in each case two pairs of antennas, each pair of antennas each having one above and one below the Pressgutmattenebene arranged slot antenna 8a, 8b, which arranged opposite arranged with facing, parallel or anti-parallel radiation directions are.
  • each antenna pair has an antenna 8a with the first geometry and an antenna 8b with the second geometry, so that only one antenna (8a or 8b) of the respective antenna pair is selected during operation and an adaptation to the width of the mat can take place.
  • the side walls 12 of the housing or of the cavities are not flat, but are curved.
  • the side walls 12 each (partially)
  • the two side walls 12 are not formed by respective cylinder half shells, but only smaller cylinder segments, wherein the segment angle ß in the embodiment is about 30 ° to 60 °.
  • an adaptation of the curvature to the wavelength of the microwave radiation or the waveguide wavelength is effected by z. B.
  • the radius r of the curvature is 0.5 times to 3 times the wavelength (or waveguide wavelength), z. B. 1, 5 times the wavelength of the microwave (or waveguide wavelength).
  • each of the individual cavities 5 a is equipped with curved side walls 12.

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  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Waveguide Aerials (AREA)

Abstract

L'invention concerne un four à passage continu (4) pour le chauffage continu d'une nappe de matière à presser (1), en particulier au cours de la fabrication de plaques de matériau en bois, pourvu d'un boîtier (5) en forme de tunnel à travers l'espace intérieur (7) duquel la nappe de matière à presser (1) peut être introduite. Le four à passage continu est caractérisé en ce qu'une ou plusieurs antennes à fentes (8a, 8b) à conducteurs creux qui comportent respectivement dans une paroi d'antenne (19) plusieurs fentes de sortie (9) réparties le long de la direction longitudinale des antennes pour le rayonnement des micro-ondes dans l'espace intérieur (7) sont agencées dans ou contre le boîtier (5), le boîtier (5) en forme de tunnel comportant une paroi supérieure (10) agencée au-dessus de la nappe de matière à presser (1) ou du plan de nappes de matière à presser et une paroi inférieure (11) agencée en dessous de la nappe de matière à presser ou du plan de nappes de matière à presser et deux parois latérales (12) agencées à côté de la nappe de matière à presser, les parois latérales étant conçues de manière incurvée.
PCT/EP2019/050240 2018-03-08 2019-01-07 Four à passage continu et installation de fabrication de plaques de matériau en bois Ceased WO2019170300A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018105390.8A DE102018105390B4 (de) 2018-03-08 2018-03-08 Durchlaufofen und Anlage zur Herstellung von Holzwerkstoffplatten
DE102018105390.8 2018-03-08

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WO2019170300A1 true WO2019170300A1 (fr) 2019-09-12

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PCT/EP2019/050240 Ceased WO2019170300A1 (fr) 2018-03-08 2019-01-07 Four à passage continu et installation de fabrication de plaques de matériau en bois

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WO (1) WO2019170300A1 (fr)

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WO2008067996A1 (fr) 2006-12-06 2008-06-12 Fricke Und Mallah Microwave Technology Gmbh Dispositif de chauffage à micro-ondes
EP2247418B1 (fr) 2007-12-30 2013-05-22 Dieffenbacher GmbH Maschinen- und Anlagenbau Procédé et dispositif pour préchauffer une natte de matériau à comprimer, au cours de la fabrication de panneaux en matériau dérivé du bois
EP2637478A2 (fr) * 2012-03-06 2013-09-11 Samsung Corning Precision Materials Co., Ltd. Appareil de chauffage à haute fréquence
WO2014075193A1 (fr) * 2012-11-16 2014-05-22 Greg Stromotich Appareil et procédé de déshydratation au moyen d'un rayonnement de micro-ondes
DE202015102422U1 (de) 2015-05-11 2016-08-15 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum kontinuierlichen Erwärmen von Material
US20170356688A1 (en) * 2016-06-13 2017-12-14 Siempelkamp Maschinen - Und Anlagenbau Gmbh Method and furnace for continuously heating a strip workpiece

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764768A (en) * 1971-08-16 1973-10-09 W Sayer Microwave applicator employing a broadside slot radiator
DE69737417T2 (de) 1996-11-21 2008-02-21 Ewes Enterprises, L.L.C. Vorrichtung und verfahren zum harten von harzen in bearbeitete holzproukten mittels mikrowellen
DE19847299C1 (de) * 1997-09-05 2000-03-16 Linn High Therm Gmbh Mikrowellen-Durchlaufofen
WO2000078515A2 (fr) * 1999-06-21 2000-12-28 Andrzej Marek Klemarewski Systeme et procede de fabrication d'un produit en bois comprime
DE10084693T1 (de) 1999-06-21 2002-08-14 Andrzej Marek Klemarewski System und Verfahren zur Herstellung eines Preßholzproduktes
EP1217459A2 (fr) * 2000-12-22 2002-06-26 NexPress Solutions LLC Méthode et unité de fixage de toner sur un support, en particulier un support d'impression
WO2008067996A1 (fr) 2006-12-06 2008-06-12 Fricke Und Mallah Microwave Technology Gmbh Dispositif de chauffage à micro-ondes
EP2247418B1 (fr) 2007-12-30 2013-05-22 Dieffenbacher GmbH Maschinen- und Anlagenbau Procédé et dispositif pour préchauffer une natte de matériau à comprimer, au cours de la fabrication de panneaux en matériau dérivé du bois
EP2637478A2 (fr) * 2012-03-06 2013-09-11 Samsung Corning Precision Materials Co., Ltd. Appareil de chauffage à haute fréquence
WO2014075193A1 (fr) * 2012-11-16 2014-05-22 Greg Stromotich Appareil et procédé de déshydratation au moyen d'un rayonnement de micro-ondes
DE202015102422U1 (de) 2015-05-11 2016-08-15 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum kontinuierlichen Erwärmen von Material
US20170356688A1 (en) * 2016-06-13 2017-12-14 Siempelkamp Maschinen - Und Anlagenbau Gmbh Method and furnace for continuously heating a strip workpiece
DE102016110808A1 (de) 2016-06-13 2017-12-14 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren zum kontinuierlichen Erwärmen einer Materialbahn und Durchlaufofen

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