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WO2018189355A1 - Four continu destiné au chauffage par micro-ondes d'un matériau - Google Patents

Four continu destiné au chauffage par micro-ondes d'un matériau Download PDF

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Publication number
WO2018189355A1
WO2018189355A1 PCT/EP2018/059492 EP2018059492W WO2018189355A1 WO 2018189355 A1 WO2018189355 A1 WO 2018189355A1 EP 2018059492 W EP2018059492 W EP 2018059492W WO 2018189355 A1 WO2018189355 A1 WO 2018189355A1
Authority
WO
WIPO (PCT)
Prior art keywords
conveyor belt
continuous furnace
plate
microwaves
materials
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/EP2018/059492
Other languages
German (de)
English (en)
Inventor
Thilo Solawa
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 WO2018189355A1 publication Critical patent/WO2018189355A1/fr
Anticipated expiration legal-status Critical
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
    • 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 is that the conveyor belt is due to the requirements of transparency for microwave radiation of plastic, such as polyester, so that it may possibly come to electrostatic charges during its movement over a wall chamber covering the bottom plate, as such plate also made a microwave transparent plastic,
  • Floor area can be introduced into the treatment room and absorbed by material.
  • it may be due to triboelectric effects for the separation of charges and thus to an electrostatic charge. This transmits and also affects the material to be treated.
  • individual charged particles of the material tend to be from the mat or fleece, in particular from the latter
  • 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
  • Object of the present invention is therefore to prevent such accumulation of electrostatically charged particles within the treatment room.
  • the invention is based on the finding that the undesirable electrostatic charges occur, in particular, when two different, initially electrically neutral materials are brought into contact, rubbed against each other and separated again. In this case, some materials emit electrons and are thereby positively charged, while other materials absorb electrons and thereby receive a negative charge surplus.
  • a preferred triboelectric series consists in particular of the materials latex-asbestos-glass-mica-nylon-wool-lead-silk-aluminum-paper-cotton-steel-wood-hard-rubber-nickel / copper-brass / silver-acetate-silk-polyester-polyurethane -polyethylene polypropylene PVC silicone-polytetrafluoroethylene Teflon.
  • the first-mentioned materials are positively charged by a contact partner mentioned below, while partners from the rear region of the aforementioned contact partners receive an excess of electrons.
  • partners from the rear region of the aforementioned contact partners receive an excess of electrons.
  • the further away a pair of materials for the conveyor belt and the plate in the list are from each other, the stronger is the formation of electrostatic charges and the more preferably the materials absorb the charges and the materials release the charges, respectively.
  • the conveyor belt and / or the plate of a permeable to the radiation, in particular microwaves, material are particularly preferred.
  • microwave permeable can be formed from this a grid or a fabric or network, their respective free spaces due to their dimensions for
  • This grid, fabric or net is then used as a conveyor belt and / or for the plate over which the conveyor belt is moved. So on the one hand, an electrostatic
  • the radiation in particular the microwave radiation, pass through the conveyor belt and the plate and heat the material resting on the conveyor belt.
  • triboelectric series is closer to the material of the counterpart than the base material and / or coincides with the material of the counterpart.
  • Such a coating over the entire surface but also be carried out only lattice, tissue or net shape, to prevent direct frictional contact between the base materials of conveyor belt and plate.
  • a preferred embodiment is characterized in that before and / or after the
  • Treatment room an absorption chamber is arranged. In this way it can be ensured that radiation which is not absorbed by the material can not escape from the continuous furnace either.
  • the plate is arranged in the treatment space and / or in the absorption chamber.
  • The, in particular microwave transparent plate is preferably arranged in the treatment room, if the material is preferably to be irradiated from both sides of the surface with microwaves.
  • the use of plates in the absorption chamber can on the one hand serve to transport the material via an absorption chamber arranged below the material, but also to shield the absorption chambers from dust and other interfering particles.
  • the conveyor belt is at least partially antistatic. This can be achieved, for example, in that metal or carbon fiber threads are embedded in the plastic of the conveyor belt or that fabric chains for guiding the charge are present in the conveyor belt.
  • Fig. 1 is a schematic diagram of a device according to the invention.
  • 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
  • chips or fibers is scattered on an endlessly circulating conveyor belt 1 to a mat or a non-woven and fed in the direction of production 3 a here only symbolically shown continuous furnace 4.
  • the continuous furnace 4 comprises a treatment space 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, whereby waveguides and the corresponding openings 6 can be dispensed with.
  • 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 on absorption elements 1 1, for example, water storage or plates of ceramic materials, passed to which the residual radiation is converted into heat and destroyed.
  • the lower conveyor belt 1 runs with its underside over a plate 5 permeable to the radiation 5 or microwaves.
  • a plate 7 made of material permeable to microwaves it is also possible to use a plate
  • Grid structure or similar be provided, which can pass through the radiation 5 and at the same time can take a carrying function, so that the lower conveyor belt 1, which is loaded with the weight of the mat, does not sag.
  • the material of the conveyor belt 1 and the material of the plate 10 are selected from a triboelectric series comprising the materials latex-asbestos-glass-mica-nylon-wool-lead-silk-aluminum-paper Cotton-steel-wood-hard-rubber-nickel / copper-brass / silver-acetate-silk-polyester-polyurethane-polyethylene-polypropylene-PVC-silicone-polytetrafluorethylene-Telfon contains. The choice is made in such a way that the two materials are close to each other in this list or, if possible, are identical. Below each other, a distance of zero to four intermediate materials is considered. Identical materials are also considered to be close together in the context of the present invention.
  • the selected material as such is not transmissive to the radiation 5, e.g. As metals (lead, aluminum, steel, nickel, copper, brass, silver, etc.), it may be designed for use as a conveyor belt 1, 8 or as a plate 10 lattice, mesh or fabric-like.
  • the radiation 5, in particular the microwaves then continue to pass, while between conveyor belt 1, 8 and plate 10, the triboelectric boundary conditions are changed so that no or only lower electrostatic charges be generated.
  • Conveyor belt 1, 8 facing top provided with a coating.
  • the material of the coating is chosen so that it in the o.g. triboelectric series closer to the base material of the counterpart is identical to the coated base material or with the material of the counterpart.
  • the properties of the conveyor belt 1, 8 or the plate 10 in terms of flexural or bending stiffness, tensile strength, etc. are determined substantially by the base material being coated while determining the triboelectric conditions between the two passing elements by the coating.
  • such a coating can also consist of the same material as the base material of the counterpart, that is to say for a coating on the conveyor belt 1, 8 of the material of the plate 10 or for a coating on the plate 10 of the material of the conveyor belt 1, 8.
  • Die Coating may be formed over the entire surface, as well as only grid, net or fabric-like. This is particularly advantageous if the selected material of the coating as such is not permeable to radiation 5, in particular microwaves, such. For example metals. Also in this way the formation of electrostatic charges is effectively prevented.

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 continu (4) destiné au chauffage par micro-ondes d'un matériau (2), comprenant un compartiment de traitement (7) destiné au chauffage du matériau (2) ; au moins un orifice (6) est ménagé dans le compartiment de traitement (7) et destiné à l'introduction du rayonnement (5) dans le compartiment de traitement (7) par l'intermédiaire de guides d'ondes et/ou les générateurs de micro-ondes sont disposés directement dans le compartiment de traitement (7), au moins une bande transporteuse sans fin (1, 8) permettant de transporter le matériau (2) via le four continu (4), et une plaque (10) qui permet de tirer la bande transporteuse (1, 8). L'invention est caractérisée en ce que la bande transporteuse (1, 8) et la plaque (10) sont constituées au moins en partie de matériaux qui sont juxtaposés dans une série triboélectrique ou qui sont identiques.
PCT/EP2018/059492 2017-04-13 2018-04-13 Four continu destiné au chauffage par micro-ondes d'un matériau Ceased WO2018189355A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017108087.2 2017-04-13
DE102017108087.2A DE102017108087A1 (de) 2017-04-13 2017-04-13 Durchlaufofen zur Erwärmung von Material mittels Mikrowellen

Publications (1)

Publication Number Publication Date
WO2018189355A1 true WO2018189355A1 (fr) 2018-10-18

Family

ID=61972142

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/059492 Ceased WO2018189355A1 (fr) 2017-04-13 2018-04-13 Four continu destiné au chauffage par micro-ondes d'un matériau

Country Status (2)

Country Link
DE (1) DE102017108087A1 (fr)
WO (1) WO2018189355A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT523614A1 (de) * 2020-03-13 2021-09-15 Holzprofi Pichlmann Gmbh Werkzeug zur spanenden Bearbeitung von Werkstoffen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018133295A1 (de) 2018-12-21 2020-06-25 Siempelkamp Maschinen- Und Anlagenbau Gmbh Vorrichtung und Verfahren zur kontinuierlichen Erwärmung einer Pressgutmatte
DE102019112632B3 (de) * 2019-05-14 2020-11-19 Siempelkamp Maschinen- Und Anlagenbau Gmbh Vorrichtung zur kontinuierlichen Erwärmung einer Pressgutmatte
DE102019112634B3 (de) * 2019-05-14 2020-10-15 Siempelkamp Maschinen- Und Anlagenbau Gmbh Vorrichtung zur kontinuierlichen Erwärmung einer Pressgutmatte

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940340A1 (de) * 1978-10-06 1980-04-24 Raytheon Co Mikrowellenheizapparat
DE19718772A1 (de) 1997-05-03 1998-11-05 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur Herstellung von Holzwerkstoffplatten
WO2014195450A1 (fr) * 2013-06-07 2014-12-11 Dieffenbacher GmbH Maschinen- und Anlagenbau Installation, four micro-ondes à passage continu et procédé de fabrication en continu de matériaux, de préférence de plaques de matériaux
DE202015102417U1 (de) * 2015-05-11 2016-06-14 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zur kontinuierlichen Herstellung von Werkstoffen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940340A1 (de) * 1978-10-06 1980-04-24 Raytheon Co Mikrowellenheizapparat
DE19718772A1 (de) 1997-05-03 1998-11-05 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur Herstellung von Holzwerkstoffplatten
WO2014195450A1 (fr) * 2013-06-07 2014-12-11 Dieffenbacher GmbH Maschinen- und Anlagenbau Installation, four micro-ondes à passage continu et procédé de fabrication en continu de matériaux, de préférence de plaques de matériaux
DE202015102417U1 (de) * 2015-05-11 2016-06-14 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zur kontinuierlichen Herstellung von Werkstoffen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT523614A1 (de) * 2020-03-13 2021-09-15 Holzprofi Pichlmann Gmbh Werkzeug zur spanenden Bearbeitung von Werkstoffen
AT523614B1 (de) * 2020-03-13 2022-07-15 Holzprofi Austria Gmbh Werkzeug zur spanenden Bearbeitung von Werkstoffen

Also Published As

Publication number Publication date
DE102017108087A1 (de) 2018-10-18

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