EP0916915B1 - Combined convective-radiative system for heat treatment of a web - Google Patents

Combined convective-radiative system for heat treatment of a web Download PDF

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Publication number
EP0916915B1
EP0916915B1 EP98402768A EP98402768A EP0916915B1 EP 0916915 B1 EP0916915 B1 EP 0916915B1 EP 98402768 A EP98402768 A EP 98402768A EP 98402768 A EP98402768 A EP 98402768A EP 0916915 B1 EP0916915 B1 EP 0916915B1
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EP
European Patent Office
Prior art keywords
elements
strip
blowing
radiant
sucking
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EP98402768A
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German (de)
French (fr)
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EP0916915A1 (en
Inventor
Jean-Pierre Robin
Yannick Lescanne
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Solaronics Process SA
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Solaronics Process SA
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    • 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
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
    • F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles

Definitions

  • the present invention relates to an installation of convective radiative heat treatment of a strip continues according to the preamble of claim 1.
  • a beautiful installation is known from EP-A- 0 291 832
  • the infrared radiant elements have a power density (power per unit area) very high, which allows for treatment thermal, by means of a space installation relatively small.
  • Hot air heating systems have the disadvantage of having a power density much weaker than those using elements infrared heaters, their size is therefore very important compared to that of a radiant system infrared performing the same heat treatment.
  • this type of installation does not require no auxiliary means to support the strip; this function being ensured by the air which can also create ripples on the tape to increase its rigidity in the direction perpendicular to its travel.
  • the object of the present invention is to remedy to the disadvantages of the above techniques, by creating a installation for drying a continuous strip which has a reduced size, which delivers a high density of heating power and which provides a solution for support the continuous tape.
  • the invention thus relates to an installation of heat treatment of a continuously moving belt next to infrared radiant elements and elements air blowers on this tape.
  • this installation is characterized in that it comprises a succession blowers separated from each other by at minus one infrared radiant element, each element blowing comprising on each side an element suction extending near a radiant element infrared.
  • the installation according to the invention thus combines infrared radiant elements with elements blowers and aspirants.
  • blowing elements allow to support contactless tape, without the use of means auxiliary, while creating undulations on the strip ensuring its mechanical rigidity in the direction perpendicular to the scroll.
  • blower-suction modules are such that they do not disturb the operation of infrared radiant elements.
  • the blowers are separated from each other by two parallel rows of infrared radiant elements.
  • each blowing element comprises near the strip at least one air blowing slot, transverse to the direction of travel Of the band.
  • the preferred version of the invention as that illustrated in figure 1 concerns an installation for the heat treatment of a strip 1 which can be move at a speed that can reach or exceed 2000 m / min.
  • the installation of heat treatment includes a succession of elements blowers 2 separated from each other by at least one infrared radiant element 3.
  • Each blowing element 2 includes a suction element on each side 4 extending near an infrared radiant element 3.
  • the radiant surface of the radiant elements 3 extends parallel to strip 1.
  • blowing elements 2 and the elements aspirants 4 are made up of boxes substantially parallelepipedal extending vertically and across the width of the strip.
  • the blowing elements 2 are connected to means (not shown) for creating an overpressure of air.
  • the suction elements 4 are connected to means (not shown) for creating a depression.
  • the elements blowers 2 are separated from each other by two parallel rows of infrared radiant elements 3.
  • Each blower element 2 includes near the strip at least one and preferably two slots air supply 8, (see Figure 2), transverse by relative to the direction of movement D of the strip 1.
  • each suction element includes near the band 1 a suction mouth 9, forming an acute dihedral with the adjacent end wall 10 of the blowing element 2.
  • the distance between the bottom of the dihedral and the band 1 is between 5 and 50 mm, in the preferred version this distance is between 10 and 25 mm.
  • edge 11 of the suction mouth 9 closest to strip 1 is connected to the wall side 12 of the suction element 4 by a wall broken 13.
  • elements infrared radiant 3 and blowing elements 2 and applicants 4 are located on each side of the strip 1.
  • elements 3, 2 and 4 are arranged symmetrically on either side of strip 1.
  • the elements 3, 2 and 4 located on one side of the strip 1 are offset, in the direction of movement D of the strip 1, relative to elements 3, 2, 4 located on the other side of band 1.
  • This offset is such that the elements 3 infrared radiant heaters located on one side are arranged opposite the blowing elements 2 and aspirants 4 located on the other side.
  • This staggered arrangement has the effect of create undulations on strip 1 which stiffen it mechanically in the direction perpendicular to the scroll.
  • infrared radiant elements 3 and / or blowing 2 and suction elements 4 may vary along the direction D of movement of band 1.
  • the strip 1 to be treated scrolls continuously in the direction D between the two superimposed series of elements 3, 4, 2.
  • Air blown by the blowers 2 (see arrows F in figure 2) hold the strip 1 away from successive elements 3, 4, 2 and supports thus the strip during its journey through the installation, without auxiliary support devices.
  • the infrared radiant elements 3 presenting high power density, transfer energy to band 1.
  • each blowing element 2 suck through their suction mouth 9, the combustion gases emitted by the radiant elements 3, if they operate on gas, the water vapor emitted by the strip 1 if it is dried (see arrows F 1 in FIG. 2) and the air coming from the blowing elements 2 (see arrows F 2 ).
  • side opposite to the radiant elements 3 of the reflectors can be arranged to improve efficiency thermal system.
  • these reflectors are arranged alternately with blowing elements, so to support the paper.
  • these reflectors can also serve as suction elements.
  • these reflectors can be-placed between elements blowers and aspirants.
  • the arrangement of the elements radiant, blowers and aspirants can be such that it provides a non-straight path from the bandaged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

La présente invention concerne une installation de traitement thermique convecto-radiatif d'une bande continue selon le préambule de la revendication 1. Une belle installation est connue par le EP-A- 0 291 832The present invention relates to an installation of convective radiative heat treatment of a strip continues according to the preamble of claim 1. A beautiful installation is known from EP-A- 0 291 832

On sait que les bandes continues ou les dépôts effectués sur ces bandes continues doivent subir des traitements thermiques. Souvent ces traitements thermiques doivent être réalisés sans contact afin de préserver la qualité de l'état de surface de la bande ou du dépôt effectué sur celle-ci. Il en est par exemple ainsi pour les bandes de papier ayant subi un traitement par voie humide tel que le traitement pour réaliser du papier couché.We know that continuous bands or deposits performed on these continuous belts must undergo heat treatments. Often these treatments must be done without contact in order to preserve the quality of the surface condition of the strip or of the deposit made on it. This is for example so for the treated paper strips wet such as treatment to achieve coated paper.

Pour traiter thermiquement sans contact ces bandes continues, on utilise actuellement deux techniques différentes :

  • soit le chauffage de bande continue au moyen d'éléments radiants infrarouges,
  • soit le chauffage au moyen d'éléments soufflants de l'air chaud, comme par exemple décrit dans le document FR 908 790.
To heat-treat these continuous strips without contact, two different techniques are currently used:
  • either continuous strip heating by means of infrared radiant elements,
  • or heating by means of elements blowing hot air, as for example described in the document FR 908 790.

Les éléments radiants infrarouges présentent une densité de puissance (puissance par unité de surface) très élevée, ce qui permet d'obtenir un traitement thermique, au moyen d'une installation d'encombrement relativement faible.The infrared radiant elements have a power density (power per unit area) very high, which allows for treatment thermal, by means of a space installation relatively small.

Toutefois, l'utilisation de ces éléments radiants exige l'emploi de moyens pour supporter la bande continue, ces moyens de support ne devant en aucun cas entrer en contact avec la bande de papier.However, the use of these radiant elements requires the use of means to support the tape continues, these support means must in no case come into contact with the paper strip.

Les systèmes de chauffage à air chaud ont l'inconvénient de présenter une densité de puissance beaucoup plus faible que ceux utilisant des éléments radiants infrarouges, leur encombrement est donc très important par rapport à celui d'un système à radiants infrarouges réalisant le même traitement thermique.Hot air heating systems have the disadvantage of having a power density much weaker than those using elements infrared heaters, their size is therefore very important compared to that of a radiant system infrared performing the same heat treatment.

Par contre, ce type d'installation ne nécessite pas de moyen auxiliaires pour supporter la bande; cette fonction étant assurée par l'air qui peut de plus créer des ondulations sur la bande pour en accroítre sa rigidité dans le sens perpendiculaire à son défilement.However, this type of installation does not require no auxiliary means to support the strip; this function being ensured by the air which can also create ripples on the tape to increase its rigidity in the direction perpendicular to its travel.

Un exemple d'installation de ce type a été décrit dans la demande internationale WO 95/14199, état de la technique selon l'article 54 (3) CBE.An example of such an installation has been described in international application WO 95/14199, state of the art according to Article 54 (3) EPC.

Dans le but d'associer les avantages des deux techniques décrites ci-dessus, des tentatives ont été effectuées pour les combiner.In order to combine the advantages of both techniques described above, attempts have been performed to combine them.

Plusieurs tentatives ont été décrites dans les brevets WO 98/34 079, EP 0 291 832, EP 0 508 254 ou US 5,261,166. Cependant, la solution décrite dans le brevet ci-dessus n'est pas parfaite au moins pour les raisons mentionnées ci-dessous:

  • les dispositifs de soufflage ne sont pas parfaitement protégés du rayonnement provenant des émetteurs d'infrarouges,
  • l'air soufflé peut perturber le bon fonctionnement de l'émetteur de rayonnement infrarouge.
Several attempts have been described in patents WO 98/34 079, EP 0 291 832, EP 0 508 254 or US 5,261,166. However, the solution described in the above patent is not perfect at least for the reasons mentioned below:
  • the blowing devices are not perfectly protected from the radiation coming from the infrared emitters,
  • the supply air can disturb the proper functioning of the infrared emitter.

Le but de la présente invention est de remédier aux inconvénients des techniques ci-dessus, en créant une installation de séchage d'une bande continue qui présente un encombrement réduit, qui délivre une forte densité de puissance de chauffage et qui apporte une solution pour supporter la bande continue.The object of the present invention is to remedy to the disadvantages of the above techniques, by creating a installation for drying a continuous strip which has a reduced size, which delivers a high density of heating power and which provides a solution for support the continuous tape.

L'invention vise ainsi une installation de traitement thermique d'une bande se déplaçant en continu en regard d'éléments radiants infrarouges et d'éléments soufflants de l'air sur cette bande.The invention thus relates to an installation of heat treatment of a continuously moving belt next to infrared radiant elements and elements air blowers on this tape.

Suivant l'invention, cette installation est caractérisée en ce qu'elle comprend une succession d'éléments soufflants séparés les uns des autres par au moins un élément radiant infrarouge, chaque élément soufflant comprenant de chaque côté un élément d'aspiration s'étendant à proximité d'un élément radiant infra-rouge.According to the invention, this installation is characterized in that it comprises a succession blowers separated from each other by at minus one infrared radiant element, each element blowing comprising on each side an element suction extending near a radiant element infrared.

L'installation selon l'invention combine ainsi des éléments radiants infra-rouges avec des éléments soufflants et aspirants.The installation according to the invention thus combines infrared radiant elements with elements blowers and aspirants.

L'encombrement de l'installation est ainsi fortement réduit en raison:

  • des éléments radiants infra-rouges qui délivrent une forte densité de puissance,
  • des volumes d'air soufflés qui sont au moins de 30% inférieurs à ceux circulant dans une installation n'utilisant que de l'air chaud.
The size of the installation is thus greatly reduced due to:
  • infrared radiant elements which deliver a high power density,
  • supply air volumes which are at least 30% lower than those circulating in an installation using only hot air.

Les éléments soufflants permettent de supporter sans contact la bande, sans l'emploi de moyens auxiliaires, tout en créant sur la bande des ondulations assurant sa rigidité mécanique dans le sens perpendiculaire au défilement.The blowing elements allow to support contactless tape, without the use of means auxiliary, while creating undulations on the strip ensuring its mechanical rigidity in the direction perpendicular to the scroll.

Les éléments aspirants disposés entre les rangées d'éléments radiants infra-rouges, de chaque côté d'un élément soufflant, permettent:

  • d'aspirer vers l'extérieur l'air chargé de vapeur d'eau provenant de la bande lorsque l'on désire la sécher, l'air soufflé par les éléments soufflants ainsi que les gaz de combustion provenant des éléments radiants infra-rouges lorsque ceux-ci fonctionnent au gaz,
  • de protéger efficacement les éléments soufflants du rayonnement provenant des éléments radiants infra-rouges, en effet la stabilité dimensionnelle des systèmes de soufflage est nécessaire à leur bon fonctionnement.
The suction elements arranged between the rows of infrared radiant elements, on each side of a blowing element, allow:
  • to suck out the air charged with water vapor coming from the strip when it is desired to dry it, the air blown by the blowing elements as well as the combustion gases coming from the infrared radiant elements when these run on gas,
  • effectively protect the blowing elements from radiation from infrared radiant elements, indeed the dimensional stability of blowing systems is necessary for their proper functioning.

La configuration des modules soufflants-aspirants est telle qu'ils ne perturbent pas le fonctionnement des éléments radiants infra-rouges. The configuration of the blower-suction modules is such that they do not disturb the operation of infrared radiant elements.

Selon une version préférée de l'invention, les éléments soufflants sont séparés les uns des autres par deux rangées parallèles d'éléments radiants infra-rouges.According to a preferred version of the invention, the blowers are separated from each other by two parallel rows of infrared radiant elements.

De préférence, chaque élément soufflant comprend près de la bande au moins une fente de soufflage d'air, transversale par rapport à la direction de déplacement de la bande.Preferably, each blowing element comprises near the strip at least one air blowing slot, transverse to the direction of travel Of the band.

D'autres particularités et avantages de l'invention apparaítront encore dans la description ci-après.Other features and advantages of the invention will appear further in the description below.

Aux dessins annexés donnés à titre d'exemples non limitatifs:

  • la figure 1 est une vue schématique en coupe longitudinale partielle d'une installation de traitement thermique conforme à l'invention,
  • la figure 2 est une vue à échelle agrandie de la partie inférieure d'un élément soufflant et des deux éléments aspirants adjacents,
  • la figure 3 est une vue analogue à la figure 1 concernant une variante de réalisation de l'installation de traitement thermique,
  • les figures 4 et 5 sont des vues analogues aux figures 1 et 3 concernant deux autres variantes.
In the appended drawings given by way of nonlimiting examples:
  • FIG. 1 is a schematic view in partial longitudinal section of a thermal treatment installation according to the invention,
  • FIG. 2 is a view on an enlarged scale of the lower part of a blowing element and of the two adjacent suction elements,
  • FIG. 3 is a view similar to FIG. 1 concerning an alternative embodiment of the thermal treatment installation,
  • Figures 4 and 5 are views similar to Figures 1 and 3 concerning two other variants.

La version préférée de l'invention telle qu'illustrée par la figure 1 concerne une installation pour le traitement thermique d'une bande 1 pouvant se déplacer à une vitesse pouvant atteindre ou dépasser 2000 m/min.The preferred version of the invention as that illustrated in figure 1 concerns an installation for the heat treatment of a strip 1 which can be move at a speed that can reach or exceed 2000 m / min.

Conformément à l'invention, l'installation de traitement thermique comprend une succession d'éléments soufflants 2 séparés les uns des autres par au moins un élément radiant infra-rouge 3. Chaque élément soufflant 2 comprend de chaque côté un élément d'aspiration 4 s'étendant à proximité d'un élément radiant infra-rouge 3. According to the invention, the installation of heat treatment includes a succession of elements blowers 2 separated from each other by at least one infrared radiant element 3. Each blowing element 2 includes a suction element on each side 4 extending near an infrared radiant element 3.

La surface radiante des éléments radiants 3 s'étend parallèlement à la bande 1.The radiant surface of the radiant elements 3 extends parallel to strip 1.

Les éléments soufflants 2 et les éléments aspirants 4 sont constitués par des caissons sensiblement parallélépipédiques s'étendant verticalement et dans le sens de la largeur de la bande.The blowing elements 2 and the elements aspirants 4 are made up of boxes substantially parallelepipedal extending vertically and across the width of the strip.

Les éléments soufflants 2 sont reliés à des moyens (non représentés) pour créer une surpression d'air.The blowing elements 2 are connected to means (not shown) for creating an overpressure of air.

Les éléments aspirants 4 sont reliés à des moyens (non représentés) pour créer une dépression.The suction elements 4 are connected to means (not shown) for creating a depression.

Dans l'exemple représenté, les éléments soufflants 2 sont séparés les uns des autres par deux rangées parallèles d'éléments radiants infra-rouges 3.In the example shown, the elements blowers 2 are separated from each other by two parallel rows of infrared radiant elements 3.

Chaque élément soufflant 2 comprend près de la bande au moins une et de préférence deux fentes de soufflage d'air 8, (voir figure 2), transversales par rapport à la direction de déplacement D de la bande 1.Each blower element 2 includes near the strip at least one and preferably two slots air supply 8, (see Figure 2), transverse by relative to the direction of movement D of the strip 1.

Comme on le voit plus en détail sur la figure 2, chaque élément d'aspiration comprend près de la bande 1 une bouche d'aspiration 9, formant un dièdre aigu avec la paroi d'extrémité adjacente 10 de l'élément soufflant 2. La distance entre le bas du dièdre et la bande 1 est comprise entre 5 et 50 mm, dans la version préférée cette distance est comprise entre 10 et 25 mm.As seen in more detail in Figure 2, each suction element includes near the band 1 a suction mouth 9, forming an acute dihedral with the adjacent end wall 10 of the blowing element 2. The distance between the bottom of the dihedral and the band 1 is between 5 and 50 mm, in the preferred version this distance is between 10 and 25 mm.

De plus, le bord 11 de la bouche d'aspiration 9 le plus proche de la bande 1 est raccordé avec la paroi latérale 12 de l'élément d'aspiration 4 par une paroi brisée 13.In addition, the edge 11 of the suction mouth 9 closest to strip 1 is connected to the wall side 12 of the suction element 4 by a wall broken 13.

La disposition de la bouche d'aspiration 9 permet à la fois:

  • d'obtenir une aspiration efficace: de l'air chargé de vapeur d'eau dans le cas d'une opération de séchage, de l'air soufflé par les modules 2, des gaz de combustion dans le cas où les éléments infra-rouges fonctionnent au gaz ou de l'air de refroidissement des connexions électriques dans le cas où les éléments radiants sont des émetteurs infra-rouges électriques,
  • d'éviter toute perturbation du fonctionnement des éléments radiants infra-rouges 3,
  • de protéger les modules de soufflage 2 du rayonnement émis par les éléments radiants 3,
  • de conserver l'efficacité des modules de soufflage en ne perturbant pas le coussin de pression d'air créé par ceux-ci sur la bande 1.
The arrangement of the suction mouth 9 allows both:
  • to obtain efficient suction: air charged with water vapor in the case of a drying operation, air blown by the modules 2, combustion gases in the case where the infrared elements operate on gas or air cooling electrical connections in the case where the radiant elements are electric infrared emitters,
  • avoid any disturbance of the operation of the infrared radiant elements 3,
  • to protect the blowing modules 2 from the radiation emitted by the radiant elements 3,
  • maintain the efficiency of the blowing modules by not disturbing the air pressure cushion created by them on the strip 1.

Dans l'exemple des figures 1 et 3, des éléments radiants infra-rouges 3 et des éléments soufflants 2 et aspirants 4 sont situés de chaque côté de la bande 1.In the example of Figures 1 and 3, elements infrared radiant 3 and blowing elements 2 and applicants 4 are located on each side of the strip 1.

Dans le cas de l'installation représentée sur la figure 3, les éléments 3, 2 et 4 sont disposés symétriquement de part et d'autre de la bande 1.In the case of the installation shown on the Figure 3, elements 3, 2 and 4 are arranged symmetrically on either side of strip 1.

Dans la version préférée de la figure 1, les éléments 3, 2 et 4 situés d'un côté de la bande 1 sont décalés, dans le sens du déplacement D de la bande 1, par rapport aux éléments 3, 2, 4 situés de l'autre côté de la bande 1. Ce décalage est tel que les éléments radiants infra-rouges 3 situés sur l'un des côtés sont disposés en regard des éléments soufflants 2 et aspirants 4 situés sur l'autre côté.In the preferred version of Figure 1, the elements 3, 2 and 4 located on one side of the strip 1 are offset, in the direction of movement D of the strip 1, relative to elements 3, 2, 4 located on the other side of band 1. This offset is such that the elements 3 infrared radiant heaters located on one side are arranged opposite the blowing elements 2 and aspirants 4 located on the other side.

Cette disposition en quinconce a pour effet de créer sur la bande 1 des ondulations qui la rigidifient mécaniquement dans le sens perpendiculaire au défilement.This staggered arrangement has the effect of create undulations on strip 1 which stiffen it mechanically in the direction perpendicular to the scroll.

Dans l'exemple de la figure 4, sur l'un des côtés de la bande 1, sont disposés une succession d'éléments radiants 3 et d'éléments soufflants 2 et aspirants 4, tandis que de l'autre côté sont disposés seulement des éléments soufflants 2 et aspirants 4. Dans le cas de cette configuration, les éléments aspirants 4 peuvent ne pas exister.In the example in Figure 4, on one of sides of strip 1, are arranged a succession radiant elements 3 and blowing elements 2 and aspirants 4, while on the other side are arranged only blower 2 and suction elements 4. In in the case of this configuration, the suction elements 4 may not exist.

La répartition des éléments radiants infra-rouges 3 et/ou des éléments soufflants 2 et aspirants 4 peut varier le long de la direction D de déplacement de la bande 1.The distribution of infrared radiant elements 3 and / or blowing 2 and suction elements 4 may vary along the direction D of movement of band 1.

Cette répartition tient compte du fait que la bande peut nécessiter des densités de puissance non constantes le long de son parcours.This distribution takes into account the fact that the tape may require non power densities constant along its course.

L'installation de traitement thermique que l'on vient de décrire fonctionne de la façon suivante:The thermal treatment installation that just described works in the following way:

La bande 1 à traiter défile en continu dans la direction D entre les deux séries superposées d'éléments 3, 4, 2.The strip 1 to be treated scrolls continuously in the direction D between the two superimposed series of elements 3, 4, 2.

L'air soufflé par les éléments soufflants 2 (voir flèches F sur la figure 2) maintiennent la bande 1 à distance des éléments successifs 3, 4, 2 et supporte ainsi la bande durant son trajet dans l'installation, sans dispositifs auxiliaires de supportage.Air blown by the blowers 2 (see arrows F in figure 2) hold the strip 1 away from successive elements 3, 4, 2 and supports thus the strip during its journey through the installation, without auxiliary support devices.

Les éléments radiants infra-rouges 3 présentant une forte densité de puissance, transfèrent de l'énergie à la bande 1.The infrared radiant elements 3 presenting high power density, transfer energy to band 1.

Les éléments aspirants 4 disposés de part et d'autre de chaque élément soufflant 2 aspirent par leur bouche d'aspiration 9, les gaz de combustion émis par les éléments radiants 3, s'ils fonctionnent au gaz, la vapeur d'eau émise par la bande 1 si on la sèche (voir flèches F1 sur la figure 2) et l'air provenant des éléments soufflants 2 (voir flèches F2).The suction elements 4 arranged on either side of each blowing element 2 suck through their suction mouth 9, the combustion gases emitted by the radiant elements 3, if they operate on gas, the water vapor emitted by the strip 1 if it is dried (see arrows F 1 in FIG. 2) and the air coming from the blowing elements 2 (see arrows F 2 ).

Dans un autre mode de réalisation, lorsque les éléments de radiants n'existent que d'un seul côté, du côté opposé aux éléments radiants 3 des réflecteurs peuvent être disposés, afin d'améliorer l'efficacité thermique du système.In another embodiment, when the radiant elements only exist on one side, side opposite to the radiant elements 3 of the reflectors can be arranged to improve efficiency thermal system.

Dans ce cas ces réflecteurs sont disposés alternativement avec des éléments soufflants, de manière à assurer la sustentation du papier.In this case these reflectors are arranged alternately with blowing elements, so to support the paper.

De plus également, ces réflecteurs peuvent servir d'éléments aspirants. In addition, these reflectors can also serve as suction elements.

Enfin dans une autre disposition, ces réflecteurs peuvent être-disposés entre les éléments soufflants et aspirants.Finally in another provision, these reflectors can be-placed between elements blowers and aspirants.

Dans tous les cas, la disposition des éléments radiants, soufflants et aspirants peut être telle qu'elle permet d'obtenir un trajet non rectiligne de la bande.In all cases, the arrangement of the elements radiant, blowers and aspirants can be such that it provides a non-straight path from the bandaged.

Les principaux avantages de l'installation que l'on vient de décrire sont les suivants:

  • l'installation présente une forte puissance par unité de surface, grâce aux éléments radiants 3, et aux éléments soufflants 2 et aspirants 4 qui du fait de leur forme compacte et de leur encombrement réduit, n'affectent pas énormément l'encombrement total de l'installation.
  • les éléments soufflants 2 permettent de supporter la bande 1, sans rouleaux ou autre moyen auxiliaire, sur tout ou partie du trajet de la bande dans l'installation.
  • la disposition d'éléments aspirants 4 de chaque côté d'un élément soufflant 2 permet d'aspirer efficacement la vapeur d'eau émise par la bande au cas où elle serait en phase évaporatoire et les gaz de combustion émis par les éléments radiants 3 s'ils fonctionnent au gaz, ainsi que l'air soufflé par les éléments 2 qui ne perturbent donc pas le fonctionnement des éléments infra-rouges.
The main advantages of the installation just described are as follows:
  • the installation has a high power per unit area, thanks to the radiant elements 3, and to the blower 2 and suction elements 4 which, due to their compact shape and their reduced size, do not greatly affect the total size of the 'installation.
  • the blowing elements 2 make it possible to support the strip 1, without rollers or other auxiliary means, over all or part of the path of the strip in the installation.
  • the arrangement of suction elements 4 on each side of a blowing element 2 makes it possible to efficiently suck up the water vapor emitted by the strip in the event that it is in the evaporative phase and the combustion gases emitted by the radiant elements 3 s 'They operate on gas, as well as the air blown by the elements 2 which therefore do not disturb the operation of the infrared elements.

Bien entendu, l'invention n'est pas limitée aux exemples de réalisation que l'on vient de décrire et on peut apporter à ceux-ci de nombreuses modifications sans sortir du cadre de l'invention.Of course, the invention is not limited to examples of realization that we have just described and we can make many changes to them without depart from the scope of the invention.

Claims (16)

  1. Convective-radiative system for heat treatment of a strip (1) which is moving opposite to infrared radiant elements (3) and elements (2) blowing air onto this strip (1), comprising a succession of blowing elements (2) that are separated from each other by at least one infrared radiant element (3), characterised in that each blowing element (2) comprises on each side a suction element (4) extending near to an infrared radiant element (3).
  2. System according to Claim 1, characterised in that each blowing element (2) comprises, close to the strip (1), at least one air-blowing slot (8) which is perpendicular to the direction of movement (D) of the strip (1).
  3. System according to one of Claims 1 to 2, characterised In that each suction element (4) comprises, close to the strip (1), a suction opening (9) forming an acute dihedral angle with the adjacent end wall (10) of the blowing element (2).
  4. System according to Claim 3, characterised in that the edge (11) of the suction opening (9) which is closest to the strip (1) is linked to the side wall (12) of the suction element (4) by a broken wall (13).
  5. System according to one of Claims 1 to 4, characterised in that infrared radiant elements (3), blowing elements (2) and sucking elements (4) are located on each side of the strip (1).
  6. System according to Claim 5, characterised in that said elements (3, 2, 4) are symmetrically arranged on either side of the strip (1).
  7. System according to Claim 5, characterised in that the elements (3, 2, 4) located on one side of the strip (1) are offset in the direction of movement (D) of the strip (1) in relation to the elements (3, 2, 4) located on the other side of the strip (1), in such a way that the infrared radiant elements (3) located on one of the sides are arranged opposite to the blowing elements (2) and sucking elements (4) located on the other side.
  8. System according to one of Claims 1 to 4, characterised in that a succession of radiant elements (3), blowing elements (2) and sucking elements (4) are arranged on one side of the strip (1), whereas blowing elements (2) only are arranged on the other side.
  9. System according to Claim 8, characterised in that reflectors are arranged between the blowing elements (2) on the side opposite to the radiant elements (3).
  10. System according to Claim 9, characterised in that the reflectors act as sucking elements.
  11. , System according to one of Claims 1 to 4, characterised in that a succession of radiant elements (3), blowing elements (2) and sucking elements (4) are arranged on one side of the strip (1), whereas blowing elements (2) and sucking elements (4) only are arranged on the other side.
  12. System according to Claim 11, characterised in that reflectors are arranged between the blowing elements and sucking elements on the side opposite to the radiant elements.
  13. System according to one of Claims 1 to 12, characterised in that the distribution of the infrared radiant elements (3) and/or the blowing elements (2) and sucking elements (4) varies along the direction of movement of the strip (1).
  14. System according to one of Claims 1 to 13, characterised in that the infrared radiant elements are gas-operated radiant burners.
  15. System according to one of Claims 1 to 13, characterised in that the infrared radiant elements are electrically operated radiant emitters.
  16. System according to one of Claims 1 to 15, characterised in that the arrangement of the radiant elements, blowing elements and sucking elements enables a non-linear path of the strip to be obtained.
EP98402768A 1997-11-14 1998-11-06 Combined convective-radiative system for heat treatment of a web Expired - Lifetime EP0916915B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9714321 1997-11-14
FR9714321A FR2771161B1 (en) 1997-11-14 1997-11-14 CONVECTO-RADIATIVE SYSTEM FOR HEAT TREATMENT OF A CONTINUOUS BAND

Publications (2)

Publication Number Publication Date
EP0916915A1 EP0916915A1 (en) 1999-05-19
EP0916915B1 true EP0916915B1 (en) 2001-07-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98402768A Expired - Lifetime EP0916915B1 (en) 1997-11-14 1998-11-06 Combined convective-radiative system for heat treatment of a web

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US (1) US6088930A (en)
EP (1) EP0916915B1 (en)
JP (1) JP4190630B2 (en)
CN (1) CN1110678C (en)
AR (1) AR017621A1 (en)
AT (1) ATE203103T1 (en)
AU (1) AU734667B2 (en)
BR (1) BR9805018A (en)
CA (1) CA2252702A1 (en)
DE (1) DE69801088T2 (en)
ES (1) ES2161027T3 (en)
FR (1) FR2771161B1 (en)

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US7116900B2 (en) * 2003-04-01 2006-10-03 Radiant Optics, Inc. Radiant energy source systems, devices, and methods capturing, controlling, or recycling gas flows
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US7926200B2 (en) 2004-03-02 2011-04-19 Nv Bekaert Sa Infrared drier installation for passing web
FR2867263B1 (en) 2004-03-02 2006-05-26 Solaronics Irt DRYING INSTALLATION FOR A TILTING STRIP, IN PARTICULAR FOR A PAPER STRIP
JP2005305794A (en) * 2004-04-21 2005-11-04 Komori Corp Dryer for sheet-like object
DE102005054995B4 (en) * 2005-07-28 2014-03-13 Otto Junker Gmbh Nozzle system for the treatment of sheet material
CN101375123B (en) * 2006-01-25 2011-06-08 贝卡尔特股份有限公司 Flame dryer
WO2007085617A1 (en) * 2006-01-25 2007-08-02 Nv Bekaert Sa Flame dryer
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JP5682460B2 (en) * 2011-06-07 2015-03-11 王子ホールディングス株式会社 Method for producing coated paper for printing
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EP3510331B1 (en) 2016-09-08 2020-06-03 Solaronics S.A. Combined convection and radiation system for heat treatment of a continuous strip
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DE102007051963A1 (en) 2007-10-31 2009-05-07 Voith Patent Gmbh Web dryer arrangement

Also Published As

Publication number Publication date
CN1226674A (en) 1999-08-25
FR2771161B1 (en) 2000-01-14
DE69801088D1 (en) 2001-08-16
AU9138598A (en) 1999-06-03
CN1110678C (en) 2003-06-04
ATE203103T1 (en) 2001-07-15
CA2252702A1 (en) 1999-05-14
JPH11217628A (en) 1999-08-10
ES2161027T3 (en) 2001-11-16
JP4190630B2 (en) 2008-12-03
US6088930A (en) 2000-07-18
DE69801088T2 (en) 2001-10-31
AU734667B2 (en) 2001-06-21
EP0916915A1 (en) 1999-05-19
AR017621A1 (en) 2001-09-12
FR2771161A1 (en) 1999-05-21
BR9805018A (en) 2001-03-20

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