EP0141227B1 - Vertical dryer - Google Patents

Vertical dryer Download PDF

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Publication number
EP0141227B1
EP0141227B1 EP84111229A EP84111229A EP0141227B1 EP 0141227 B1 EP0141227 B1 EP 0141227B1 EP 84111229 A EP84111229 A EP 84111229A EP 84111229 A EP84111229 A EP 84111229A EP 0141227 B1 EP0141227 B1 EP 0141227B1
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EP
European Patent Office
Prior art keywords
air
web
drying
treatment
chamber
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.)
Expired
Application number
EP84111229A
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German (de)
French (fr)
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EP0141227A2 (en
EP0141227A3 (en
Inventor
Gerold Fleissner
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.)
Truetzschler Nonwovens GmbH
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Fleissner GmbH
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Filing date
Publication date
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Publication of EP0141227A2 publication Critical patent/EP0141227A2/en
Publication of EP0141227A3 publication Critical patent/EP0141227A3/en
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Publication of EP0141227B1 publication Critical patent/EP0141227B1/en
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • 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
    • 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

Definitions

  • the invention relates to a drying chamber, e.g. B. predrying shaft or hot-flue construction, for the heat treatment of a vertically guided, a certain width having web with arranged on both sides of the web, in the direction of the web outlet openings having air guide boxes, which is assigned a radial fan for circulating the dry air.
  • a drying chamber e.g. B. predrying shaft or hot-flue construction
  • a device of this type is known from DE-A-23 20 479.
  • nozzle boxes are arranged transversely on both sides - subsequently offset from one another - which have their blow-in openings on the side end of the shaft.
  • a radial fan assigned to each nozzle box group is used to circulate the treatment air, the axis of rotation of which is oriented perpendicular to the web.
  • the treatment air is recirculated via channels arranged parallel to the nozzle boxes, so that there is a specific air circuit for each fan.
  • the motors for driving the fans are always arranged on the side on which the nozzle boxes are provided for the other side of the web. In this way, the drying shaft is narrow, although the drying shaft is very wide due to the alignment of the fans with their axis perpendicular to the web.
  • Drying shafts are generally only for pre-drying a z. B. with a dyeing product is required so that the web at the beginning of the drying process no longer comes into contact with any management organs.
  • a drying shaft is so z. B. above a foulard, from the last deflecting or squeezing roller, the web runs directly up into the drying shaft.
  • the task of such a predrying shaft is to achieve rapid heating and evaporation of the liquid. Pure nozzle ventilation is not sufficient for this.
  • the invention has for its object to find a drying shaft for pre-drying a web, in which, in addition to the radiant heaters, a recirculation system is also provided, which ensures the rapid removal of the heated moist air without fluttering the web.
  • the outer construction of the drying shaft should not be much deeper than is necessary to accommodate the infrared heating elements and an air supply. This means that several such drying shafts can be placed directly next to one another and do not hinder motors, fan boxes or the like.
  • a construction is to be found in which, in addition to a favorable energy balance, the smallest possible outer surface of the drying chute and nevertheless a rapid heating up of the material web and a rapid removal of the vaporized liquid is made possible.
  • the infrared heating elements are also arranged in the drying shaft here across the width of the web on both sides of the web. Because of this construction, the device is only a little deeper than is necessary for heating the web by means of the infrared heating elements. The greater depth is achieved solely by the air supply boxes required on both sides. The return of the treatment air accelerated by the fan takes place on the end faces of the drying shaft to the side of the width of the web so that the depth of the The drying shaft only has to be as wide as the diameter of the fan, of course taking into account the air volume that the air duct box has to accommodate on the respective web side.
  • the vertically installed drying shaft has an all-round insulated housing 1 which has the inlet slot 2 on the underside and the outlet slot 3 vertically above it.
  • the web 4 comes from a paddle arranged below the drying shaft, but not shown, and is above the shaft along the guide roller 5 to the next treatment unit, such as. B. another drying shaft.
  • the web 4 is dried on both sides with radiation energy and partly also with a convection system.
  • Infrared heating rods 6, which are arranged at a distance from one another, are responsible for the radiation energy, between which and the web 4 there is sufficient space to be able to move shielding depressions 7 in front of the infrared heating rods 6.
  • the shielding troughs 7 are arranged in a gap with the infrared heating elements 6 arranged one above the other, while they are pushed in front of the heating elements 6 when the web 4 is stationary and thus the web 4 is protected from the burning rays.
  • a dry air system serves to remove the moist air generated by the radiation energy along the surface of the web 4.
  • the heated to prevent cooling of the web 4 dry air passes through parallel to the web 4 slots 8, which are inclined upwards in the direction of the goods transport, between the infrared heating rods 6 and then between the respective shielding troughs 7 and then obliquely on the web 4.
  • By aligning the slots 8 upward in the transport direction of the web an upward air flow is generated on the web, which ensures the rapid evacuation of the resulting vapor layer.
  • an air extraction space 9 with a fresh air supply pipe 30 is provided on the right and left of the web 4, which is separated from the treatment area of the drying shaft by a screen cover 10.
  • the essential circulating air is extracted through this air outflow space 9, since the goods outlet slot 3 is narrowly delimited by metal sheets.
  • the air suction space 9 extends along the entire width of the drying shaft and has a radial fan 11, 12 on its end faces outside the width of the web, which generates a negative pressure in the air suction space 9.
  • the air suction chamber 9 is arranged according to FIG. 3 on both sides of the web 4 and extends conically widening from the center of the drying shaft to the fan suction chamber 13, into which the two air suction rooms 9 open from both sides of the web 4.
  • the fan suction space 13 is already arranged outside the treatment width of the drying shaft in the air return area 14 provided on the front side of the drying shaft.
  • This air return area 14 consists of two air return channels 15, 16, which emerge from FIG. 3 when viewed from above.
  • the air return channels 15, 16 are arranged on the inside of the outer housing 1 and leave between them a free space 17, which is provided for free access to the actual drying area in the drying shaft and is closed from the outside by a door 18.
  • the fan suction chamber 13 and the fan 11, 12 with the fan chamber 11 ', 12' and the air repulsion tube 31, 32 are arranged above the air return area 14, the fan suction chamber 13 and the fan 11, 12 with the fan chamber 11 ', 12' and the air repulsion tube 31, 32 are arranged.
  • the respective fan 11, 12 blows the air from above into the air return ducts 15, 16 via a sieve plate 19, which can also be seen in FIG.
  • the dry air then passes laterally into the air storage space 20, 21, which is delimited at the top by a sieve-shaped baffle 22, 23.
  • the heating unit 24, 25 is arranged above the baffle plate 22, 23 and, like the air storage space 20, 21, extends over the entire width of the drying area of the drying shaft extends.
  • the heating device 24, 25 is followed on each side of the web 4 by the respective air guide box 26, 27, which guides the heated treatment air to the slots 8.
  • the air duct 26, 27 is wide in the area of the heating device 24, 25 and narrow in the area of the air return spaces 9, ie it extends conically upwards.
  • the two air return areas 14 on both sides of the drying shaft are half bounded by a hinged door 28, 29 in the free flow cross section.
  • This door is closed when the device is operating, i.e. it is aligned vertically. If the web 4 is at a standstill, it is expedient to supply cooling air to the infrared heating elements 6 instead of heated circulating air. This is brought about by the doors 28, 29 swinging open and the treatment air accelerated by the fan 11, 12, bypassing the heating device 24, 25 flows immediately into the air guide box 26, 27 and thus to the infrared heating elements 6 via the slots 8. At the same time, the shielding troughs 7 will move in front of the infrared heating elements 6, so that burning of the material web is prevented with certainty.
  • the treatment air circulated by the fans 11, 12 not only flows from the storage spaces 20, 21 through the heating device 24, 25 into the treatment area, but also through slots 8 ′ arranged below the heating device 24, 25 onto the Web 4.
  • This treatment air has not yet flowed through the heating device again, but it still has enough heat to advantageously influence the drying process or the removal of the moist air.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)

Description

Die Erfindung bezieht sich auf einen Trockenschacht, z. B. Vortrockenschacht oder Hotflue-Konstruktion, zur Wärmebehandlung einer lotrecht geführten, eine gewisse Breite aufweisenden Warenbahn mit auf beiden Seiten der Warenbahn angeordneten, in Richtung der Warenbahn Ausblasöffnungen aufweisenden Luftführungskästen, denen ein Radialventilator zur Umwälzung der Trockenluft zugeordnet ist.The invention relates to a drying chamber, e.g. B. predrying shaft or hot-flue construction, for the heat treatment of a vertically guided, a certain width having web with arranged on both sides of the web, in the direction of the web outlet openings having air guide boxes, which is assigned a radial fan for circulating the dry air.

Eine Vorrichtung dieser Art ist aus der DE-A-23 20 479 bekannt. Zur Belüftung der Warenbahn sind auf beiden Seiten - in der Folge versetzt zueinander - Düsenkästen quer gerichtet angeordnet, die ihre Einblasöffnungen auf der seitlichen Stirnseite des Schachtes aufweisen. Zur Umwälzung der Behandlungsluft dient ein jeder Düsenkastengruppe zugeordneter Radialventilator, dessen Drehachse senkrecht zur Warenbahn ausgerichtet ist. Die Rückführung der Behandlungsluft erfolgt über parallel zu den Düsenkästen angeordnete Kanäle, so daß also ein bestimmter Luftkreislauf für jeden Ventilator vorhanden ist. Die Motoren zum Antrieb der Ventilatoren sind stets auf der Seite angeordnet, an der die Düsenkästen für die andere Warenbahnseite vorgesehen sind. Auf diese Weise baut der Trockenschacht schmal, wenn auch durch die Ausrichtung der Ventilatoren mit ihrer Achse senkrecht zur Warenbahn der Trockenschacht sehr breit baut.A device of this type is known from DE-A-23 20 479. For ventilation of the web, nozzle boxes are arranged transversely on both sides - subsequently offset from one another - which have their blow-in openings on the side end of the shaft. A radial fan assigned to each nozzle box group is used to circulate the treatment air, the axis of rotation of which is oriented perpendicular to the web. The treatment air is recirculated via channels arranged parallel to the nozzle boxes, so that there is a specific air circuit for each fan. The motors for driving the fans are always arranged on the side on which the nozzle boxes are provided for the other side of the web. In this way, the drying shaft is narrow, although the drying shaft is very wide due to the alignment of the fans with their axis perpendicular to the web.

Trockenschächte werden im allgemeinen nur zum Vortrocknen einer z. B. mit einer Färbeflüssigkeit versehenen Ware benötigt, damit die Warenbahn beim beginnenden Trockenvorgang nicht mehr mit irgendwelchen Führungsorganen in Berührung kommt. Ein Trockenschacht steht also z. B. oberhalb eines Foulards, von dessen letzter Umlenk- oder Quetschwalze die Warenbahn unmittelbar in den Trockenschacht aufwärts läuft. Die Aufgabe eines solchen Vortrockenschachtes ist es, ein schnelles Aufheizen und Verdampfen der Flüssigkeit zu erreichen. Dazu reicht eine reine Düsenbelüftung nicht aus. Auch gibt es Warenbahnen, die nicht luftdurchlässig sind, so daß im allgemeinen zum Vortrocknen Infrarot-Trockenschächte gebaut werden. Zur Aufheizung der Warenbahn und damit zum Verdampfen der an ihr haftenden Flüssigkeit dient dort eine Vielzahl von über die Höhe des Trockenschachtes angeordneten Infrarot-Heizstäben, die mit hoher Strahlungsenergie ein schnelles Verdampfen der Flüssigkeit an der Warenbahn bewirken, ohne daß die Warenbahn dabei durchlüftet werden muß. Ein befriedigender Trockenvorgang findet jedoch nur dann statt, wenn die den weiteren Durchgang der Strahlen behindernde, verdampfte Flüssigkeit auch kontinuierlich abtransportiert wird, und zwar ohne die Ware dabei zu kühlen. Dazu ist eine Luftbewegung parallel der Warenbahnoberfläche erforderlich, wozu eine Konstruktion nach der DE-A-23 20 479 nicht sinnvoll ist. Bei einem Vortrockenschacht muß auf jeden Fall ein intensives Bedüsen, was zum Flattern der Warenbahn führt, verhindert werden. Nicht die Luft soll das Vortrocknen bewirken, sondern die Strahlungsenergie der Infrarot-Heizstäbe.Drying shafts are generally only for pre-drying a z. B. with a dyeing product is required so that the web at the beginning of the drying process no longer comes into contact with any management organs. A drying shaft is so z. B. above a foulard, from the last deflecting or squeezing roller, the web runs directly up into the drying shaft. The task of such a predrying shaft is to achieve rapid heating and evaporation of the liquid. Pure nozzle ventilation is not sufficient for this. There are also webs of material that are not air-permeable, so that infrared drying shafts are generally built for predrying. For heating the web and thus for evaporating the liquid adhering to it, there is a multitude of infrared heating rods arranged above the height of the drying shaft, which, with high radiation energy, cause the liquid to evaporate quickly on the web without the web having to be aerated . However, a satisfactory drying process only takes place if the vaporized liquid which hinders the further passage of the rays is also continuously removed, without cooling the goods in the process. This requires an air movement parallel to the surface of the web, for which purpose a construction according to DE-A-23 20 479 is not useful. In the case of a predrying shaft, intensive spraying, which causes the web to flutter, must be prevented. It is not the air that is supposed to cause predrying, but the radiation energy of the infrared heating elements.

Ausgehend von der Vorrichtung anfangs genannter Art liegt der Erfindung die Aufgabe zugrunde, ein Trockenschacht zum Vortrocknen einer Warenbahn zu finden, bei dem neben den Strahlungsheizkörpern weiterhin ein Umluftsystem vorgesehen ist, das den schnellen Abtransport der aufgeheizten Feuchtluft ohne Flatterbewegung der Warenbahn gewährleistet. Gleichzeitig soll die Außenkonstruktion des Trockenschachtes nicht viel tiefer sein, als sie zur Aufnahme der Infrarot-Heizstäbe und einer Luftzuführung notwendig ist. Dies damit mehrere derartige Trockenschächte unmittelbar nebeneinander gestellt werden können und Motoren, Ventilatorkästen od. dgl. dabei nicht hindern. Letztlich soll eine Konstruktion gefunden werden, bei der neben einer günstigen Energiebilanz eine möglichst geringe Außenfläche des Trockenschachtes und dennoch eine schnelle Aufheizung der Warenbahn und ein schneller Abtransport der verdampften Flüssigkeit möglich gemacht ist.Starting from the device initially mentioned, the invention has for its object to find a drying shaft for pre-drying a web, in which, in addition to the radiant heaters, a recirculation system is also provided, which ensures the rapid removal of the heated moist air without fluttering the web. At the same time, the outer construction of the drying shaft should not be much deeper than is necessary to accommodate the infrared heating elements and an air supply. This means that several such drying shafts can be placed directly next to one another and do not hinder motors, fan boxes or the like. Ultimately, a construction is to be found in which, in addition to a favorable energy balance, the smallest possible outer surface of the drying chute and nevertheless a rapid heating up of the material web and a rapid removal of the vaporized liquid is made possible.

Zur Lösung dieser Aufgabe sieht die Erfindung vor, daß

  • a) über die Höhe des Trockenschachtes beidseitig der Warenbahn Infrarotheizstäbe angeordnet sind,
  • b) sich nur ein Luftführungskasten auf jeder Seite der Warenbahn über die Behandlungshöhe des Schachtes erstreckt,
  • c) sich dieser jeweils eine Luftführungskasten auch über die Behandlungsbreite des Schachtes erstreckt,
  • d) der Luftführungskasten an der Unterseite die Trockenlufteinströmöffnung aufweist und
  • e) oberhalb der Behandlungshöhe des Luftführungskastens ein Luftabsaugraum angeordnet ist, dem
  • f) stirnseitig der Radialventilator mit seiner Drehachse parallel zur Warenbahn in einem Ventilatorraum zugeordnet ist, der
  • g) außerhalb der Behandlungsbreite in einem stirnseitig des Trockenschachtes vorgesehenen und über seine Höhe sich erstreckenden Luftrückführraum angeordnet ist.
To achieve this object, the invention provides that
  • a) infrared heating rods are arranged above the height of the drying shaft on both sides of the web,
  • b) there is only one air duct box on each side of the web over the treatment height of the shaft,
  • c) this one air guide box also extends over the treatment width of the shaft,
  • d) the air guide box has the dry air inflow opening on the underside and
  • e) an air suction space is arranged above the treatment height of the air guide box
  • f) the front side of the radial fan is assigned with its axis of rotation parallel to the web in a fan room which
  • g) is arranged outside the treatment width in an air return space provided on the front of the drying shaft and extending over its height.

Neben der Konstruktion zur Umwälzung der für den Abtransport der Feuchtluft dienenden Trockenluft sind also hier in dem Trockenschacht auch die Infrarot-Heizstäbe quer über die Warenbahnbreite auf beiden Seiten der Warenbahn angeordnet. Aufgrund dieser Konstruktion ist die Vorrichtung nur wenig tiefer als gerade zur Aufheizung der Warenbahn mittels der Infrarotheizstäbe notwendig ist. Die größere Tiefe wird allein durch die beidseitig notwendigen Luftzuführkästen bewirkt. Die Rückführung der durch den Ventilator beschleunigten Behandlungsluft erfolgt an den Stirnseiten des Trockenschachtes seitlich der Warenbahnbreite, so daß die Tiefe des Trockenschachtes nur so breit sein muß, wie der Durchmesser des Ventilators ist, selbstverständlich unter Berücksichtigung des Luftvolumens, das der Luftführungskasten auf der jeweiligen Warenbahnseite aufnehmen muß.In addition to the construction for circulating the drying air used to remove the moist air, the infrared heating elements are also arranged in the drying shaft here across the width of the web on both sides of the web. Because of this construction, the device is only a little deeper than is necessary for heating the web by means of the infrared heating elements. The greater depth is achieved solely by the air supply boxes required on both sides. The return of the treatment air accelerated by the fan takes place on the end faces of the drying shaft to the side of the width of the web so that the depth of the The drying shaft only has to be as wide as the diameter of the fan, of course taking into account the air volume that the air duct box has to accommodate on the respective web side.

Es ist zweckmäßig, zur ausreichenden Belüftung der Warenbahn mit Umluft auf beiden Stirnseiten des Trockenschachtes je einen Ventilator dem Luftabsaugraum zuzuordnen, die dann auf beiden Stirnseiten die Behandlungsluft nach unten, entlang der Luftrückführräume blasen und unten einem über die Breite der Warenbahn im Bereich des Einlaufs des Trockenschachtes angeordneten Stauraum zuführen. Von dort verteilt sich die Luft über eine dort vorgesehene Siebdecke durch eine parallel zur Warenbahn angeordnete Heizeinrichtung, nach der dann der Luftführungskasten sich konisch verengend nach oben erstreckt.For adequate ventilation of the material web with circulating air, it is expedient to assign a fan to the air extraction space on both ends of the drying shaft, which then blow the treatment air downwards on both ends, along the air recirculation rooms, and below one across the width of the material web in the area of the inlet of the Feed the arranged storage space to the dry shaft. From there, the air is distributed over a sieve cover provided there by a heating device arranged parallel to the web, after which the air guide box then extends conically narrowing upwards.

Die genauere Konstruktion des erfindungsgemäßen Trockenschachtes geht aus der folgenden Figurenbeschreibung hervor. Anhand dieses Beispiels werden noch weitere beanspruchte Details erläutert, die im Zusammenhang mit den Merkmalen der grundsätzlichen Erfindung ebenfalls von Bedeutung sind. Es zeigen:

  • Figur 1 einen Infrarot-Trockenschacht im Schnitt, von der Stirnseite aus gesehen,
  • Figur 2 den Infrarot-Trockenschacht nach Figur 1 entlang der Schnittlinie 11 - II und
  • Figur 3 ebenfalls im Schnitt die Draufsicht auf den Trockenschacht.
The more precise construction of the drying shaft according to the invention is evident from the following description of the figures. Based on this example, further claimed details are explained, which are also of importance in connection with the features of the basic invention. Show it:
  • FIG. 1 shows an infrared drying shaft in section, seen from the front,
  • Figure 2 shows the infrared drying shaft of Figure 1 along the section line 11 - II and
  • Figure 3 also in section, the top view of the drying shaft.

Der lotrecht aufgestellte Trockenschacht hat ein rundum isoliertes Gehäuse 1, das auf der Unterseite den Einlaufschlitz 2 und lotrecht darüber den Auslaufschlitz 3 aufweist. Die Warenbahn 4 kommt von einem unterhalb des Trockenschachtes angeordneten, jedoch nicht dargestellten Foulard und wird oberhalb des Schachtes entlang der Umlenkrolle 5 zum nächsten Behandlungsaggregat, wie z. B. einem weiteren Trockenschacht, transportiert.The vertically installed drying shaft has an all-round insulated housing 1 which has the inlet slot 2 on the underside and the outlet slot 3 vertically above it. The web 4 comes from a paddle arranged below the drying shaft, but not shown, and is above the shaft along the guide roller 5 to the next treatment unit, such as. B. another drying shaft.

Auf dem Wege vom Einlauf 2 bis zum Auslauf 3 wird die Warenbahn 4 beidseitig mit Strahlungsenergie und teilweise auch mit einem Konvektionssystem getrocknet. Für die Strahlungsenergie sind mit Abstand voneinander angeordnete Infrarotheizstäbe 6 zuständig, zwischen denen und der Warenbahn 4 genügend Platz gelassen ist, um Abschirmmulden 7 vor die Infrarotheizstäbe 6 verschieben zu können. Bei kontinuierlich vorlaufender Warenbahn sind die Abschirmmulden 7 auf Lücke zu den übereinander angeordneten Infrarotheizstäben 6 angeordnet, während sie bei stillstehender Warenbahn 4 vor die Heizstäbe 6 geschoben werden und damit die Warenbahn 4 vor den verbrennenden Strahlen geschützt ist.On the way from the inlet 2 to the outlet 3, the web 4 is dried on both sides with radiation energy and partly also with a convection system. Infrared heating rods 6, which are arranged at a distance from one another, are responsible for the radiation energy, between which and the web 4 there is sufficient space to be able to move shielding depressions 7 in front of the infrared heating rods 6. In the case of a continuously advancing web, the shielding troughs 7 are arranged in a gap with the infrared heating elements 6 arranged one above the other, while they are pushed in front of the heating elements 6 when the web 4 is stationary and thus the web 4 is protected from the burning rays.

Zum Abtransport der durch die Strahlungsenergie erzeugten Feuchtluft entlang der Oberfläche der Warenbahn 4 dient ein Trockenumluftsystem. Die zur Verhinderung einer Abkühlung der Warenbahn 4 aufgeheizte Trockenluft gelangt über parallel zur Warenbahn 4 angeordnete Schlitze 8, die in Richtung des Warentransportes nach oben geneigt sind, zwischen die Infrarotheizstäbe 6 und im Anschluß daran zwischen die jeweils vorgesehenen Abschirmmulden 7 und dann schräg auf die Warenbahn 4. Durch die Ausrichtung der Schlitze 8 nach oben in Transportrichtung der Warenbahn wird an der Warenbahn eine nach oben gerichtete Luftströmung erzeugt, die für den schnellen Abtransport der entstandenen Dampfschicht sorgt.A dry air system serves to remove the moist air generated by the radiation energy along the surface of the web 4. The heated to prevent cooling of the web 4 dry air passes through parallel to the web 4 slots 8, which are inclined upwards in the direction of the goods transport, between the infrared heating rods 6 and then between the respective shielding troughs 7 and then obliquely on the web 4. By aligning the slots 8 upward in the transport direction of the web, an upward air flow is generated on the web, which ensures the rapid evacuation of the resulting vapor layer.

Oberhalb der letzten Infrarotheizstäbe 6 innerhalb des Trockenschachtes ist rechts und links der Warenbahn 4 jeweils ein Luftabsaugraum 9 mit einem Frischluftzuführrohr 30 vorgesehen, der vom Behandlungsbereich des Trockenschachtes durch eine Siebdecke 10 abgetrennt ist. Die wesentliche Umluft wird durch diesen Luftabströmraum 9 abgesaugt, da der Warenauslaufschlitz 3 durch Bleche eng begrenzt ist. Wie aus Figur 2 ersichtlich, erstreckt sich der Luftabsaugraum 9 entlang der ganzen Breite des Trockenschachtes und weist an dessen Stirnseiten außerhalb der Warenbahnbreite je einen Radialventilator 11, 12 auf, der in dem Luftabsaugraum 9 einen Unterdruck erzeugt. Der Luftabsaugraum 9 ist gemäß Figur 3 auf beiden Seiten der Warenbahn 4 angeordnet und erstreckt sich konisch erweiternd von der Mitte des Trockenschachtes bis zum Ventilatoransaugraum 13, in den die beiden Luftabsaugräume 9 von beiden Seiten der Warenbahn 4 einmünden.Above the last infrared heating elements 6 inside the drying shaft, an air extraction space 9 with a fresh air supply pipe 30 is provided on the right and left of the web 4, which is separated from the treatment area of the drying shaft by a screen cover 10. The essential circulating air is extracted through this air outflow space 9, since the goods outlet slot 3 is narrowly delimited by metal sheets. As can be seen from FIG. 2, the air suction space 9 extends along the entire width of the drying shaft and has a radial fan 11, 12 on its end faces outside the width of the web, which generates a negative pressure in the air suction space 9. The air suction chamber 9 is arranged according to FIG. 3 on both sides of the web 4 and extends conically widening from the center of the drying shaft to the fan suction chamber 13, into which the two air suction rooms 9 open from both sides of the web 4.

Wie aus Figur 2 ersichtlich, ist der Ventilatoransaugraum 13 bereits außerhalb der Behandlungsbreite des Trockenschachtes im stirnseitig des Trockenschachtes vorgesehenen Luftrückführbereich 14 angeordnet. Dieser Luftrückführbereich 14 besteht aus zwei Luftrückführkanälen 15, 16, die von oben gesehen aus Figur 3 hervorgehen. Die Luftrückführkanäle 15,16 sind an der Innenseite des Außengehäuses 1 angeordnet und lassen zwischen sich einen freien Raum 17, der für den freien Zugang des eigentlichen Trockenbereiches im Trockenschacht vorgesehen und durch eine Tür 18 von außen verschlossen ist.As can be seen from FIG. 2, the fan suction space 13 is already arranged outside the treatment width of the drying shaft in the air return area 14 provided on the front side of the drying shaft. This air return area 14 consists of two air return channels 15, 16, which emerge from FIG. 3 when viewed from above. The air return channels 15, 16 are arranged on the inside of the outer housing 1 and leave between them a free space 17, which is provided for free access to the actual drying area in the drying shaft and is closed from the outside by a door 18.

Oberhalb des Luftrückführbereiches 14 ist also der Ventilatoransaugraum 13 und der Ventilator 11, 12 mit dem Ventilatorraum 11', 12' und dem Luftabstossrohr 31, 32 angeordnet. Der jeweilige Ventilator 11, 12 bläst die Luft von oben über ein auch aus Figur 1 ersichtliches Siebblech 19 in die Luftrückführkanäle 15, 16. Die Luftrückführkanäle 15, 16 sind bei normalem Betrieb bis zur Unterseite des Trockenschachtes im ganzen Querschnitt offen. Von der Unterseite der Luftrückführkanäle 15, 16 gelangt dann die Trockenluft seitlich in den Luftstauraum 20, 21, der nach oben hin durch ein siebförmiges Staublech 22, 23 begrenzt ist. Oberhalb des Staubleches 22, 23 ist das Heizaggregat 24, 25 angeordnet, das sich genauso wie der Luftstauraum 20, 21 über die ganze Breite des Trockenbereiches des Trockenschachtes erstreckt. An die Heizeinrichtung 24, 25 schließt sich auf jeder Seite der Warenbahn 4 der jeweilige Luftführungskasten 26, 27 an, der die aufgeheizte Behandlungsluft zu den Schlitzen 8 führt. Zur gleichmäßigeren Luftverteilung ist der Luftführungsschacht 26, 27 im Bereich der Heizeinrichtung 24, 25 breit und im Bereich der Luftrückführräume 9 schmal ausgebildet, d.h. er erstreckt sich nach oben hin konisch zu.Above the air return area 14, the fan suction chamber 13 and the fan 11, 12 with the fan chamber 11 ', 12' and the air repulsion tube 31, 32 are arranged. The respective fan 11, 12 blows the air from above into the air return ducts 15, 16 via a sieve plate 19, which can also be seen in FIG. From the underside of the air return ducts 15, 16, the dry air then passes laterally into the air storage space 20, 21, which is delimited at the top by a sieve-shaped baffle 22, 23. The heating unit 24, 25 is arranged above the baffle plate 22, 23 and, like the air storage space 20, 21, extends over the entire width of the drying area of the drying shaft extends. The heating device 24, 25 is followed on each side of the web 4 by the respective air guide box 26, 27, which guides the heated treatment air to the slots 8. For more uniform air distribution, the air duct 26, 27 is wide in the area of the heating device 24, 25 and narrow in the area of the air return spaces 9, ie it extends conically upwards.

Nach Figur 2 sind die beiden Luftrückführbereiche 14 auf beiden Seiten des Trockenschachtes zur Hälfte durch eine aufklappbare Türe 28, 29 im freien Durchströmquerschnitt begrenzt. Diese Türe ist bei Betrieb der Vorrichtung geschlossen, d.h. sie ist lotrecht ausgerichtet. Im Falle des Stillstandes der Warenbahn 4 ist es zweckmäßig, den Infrarotheizstäben 6 statt aufgeheizter Umluft Kühlluft zuzuführen. Dies wird bewirkt, indem die Türen 28, 29 aufschwenken und die vom Ventilator 11, 12 beschleunigte Behandlungsluft, unter Umgehung der Heizeinrichtung 24, 25 sogleich in den Luftführungskasten 26, 27 und damit zu den Infrarotheizstäben 6 über die Schlitze 8 strömt. Gleichzeitig werden die Abschirmmulden 7 sich vor die Infrarotheizstäbe 6 bewegen, so daß ein Verbrennen der Warenbahn mit Sicherheit verhindert ist.According to FIG. 2, the two air return areas 14 on both sides of the drying shaft are half bounded by a hinged door 28, 29 in the free flow cross section. This door is closed when the device is operating, i.e. it is aligned vertically. If the web 4 is at a standstill, it is expedient to supply cooling air to the infrared heating elements 6 instead of heated circulating air. This is brought about by the doors 28, 29 swinging open and the treatment air accelerated by the fan 11, 12, bypassing the heating device 24, 25 flows immediately into the air guide box 26, 27 and thus to the infrared heating elements 6 via the slots 8. At the same time, the shielding troughs 7 will move in front of the infrared heating elements 6, so that burning of the material web is prevented with certainty.

Wie aus Figur 1 ersichtlich, strömt die von den Ventilatoren 11, 12 umgewälzte Behandlungsluft nicht nur von den Stauräumen 20, 21 durch die Heizeinrichtung 24, 25 in den Behandlungsbereich, sondern auch noch durch unterhalb der Heizeinrichtung 24, 25 angeordnete Schlitze 8' auf die Warenbahn 4. Diese Behandlungsluft ist zwar nicht erneut durch die Heizeinrichtung geströmt, jedoch weist sie noch genügend Wärme auf, um den Trockenvorgang bzw. den Abtransport der Feuchtluft vorteilhaft zu beeinflussen.As can be seen from FIG. 1, the treatment air circulated by the fans 11, 12 not only flows from the storage spaces 20, 21 through the heating device 24, 25 into the treatment area, but also through slots 8 ′ arranged below the heating device 24, 25 onto the Web 4. This treatment air has not yet flowed through the heating device again, but it still has enough heat to advantageously influence the drying process or the removal of the moist air.

Claims (17)

1. Drying shaft, e.g. preliminary drying shaft or hot-flue construction, for the heat treatment of a vertically guided web of material of predetermined width, having air conduction campartments which are dispased on bath sides of the web of material and are provided with discharge openings directed towards the web of material, a radial fan being associated with the air conduction compartments for the circulation of the drying air, characterised in that
a) infra-red heating rods (6) are disposed above the level of the drying shaft on both sides of the web of material (4),
b) only one air condition compartment (26, 27) extends on each side of the web of material (4) above the treatment level of the shaft.
c) this one air conduction compartment (26, 27) also extends over the treatment width of the shaft,
d) the air conduction compartment (26, 27) is provided with the drying air inlet aperture on its underside, and
e) an air exhaust chamber (9) is disposed above the treatment level of the air conduction compartment (26, 27),
f) the radial fan (11, 12) being associated with the end face of the air exhaust chamber (g) and having its axis of rotation parallel to the web of material (4) in a ventilator chamber (11', 12') which
g) is disposed externally of the treatment width in an air recycling chamber (14) which isprovided on the end face of the drying shaft and extends over its height.
2. Apparatus according to claim 1, characterised in that radial fan (11, 12) is associated with the air exhaust chamber (9) on each of the two end faces of the drying shaft.
3. Apparatus according to claim 1 or 2, characterised in that the air exhaust chamber (9) is disposed on both sides of the web of material (4) immadiately above the respective air conduction compartment (26, 27).
4. Apparatus according to claim 3, characterised in that the air exhaust chamber (9) is open only in the direction of the guidance plane of the web of material, and an air baffle plate, such as perforated plate (10) is provided there.
5. Apparatus according to any of claims 2-4 characterised in that the two air suction chambers (9), one on each side of the web of material, only ever discharge into one respective ventilator exhaust chamber (13) externally of the treatment width.
6. Apparatus according to one of claims 2-5, characterised in that the air exhaust chamber (9) communicates with a fresh air exhaust aperture (30).
7. Apparatus according to one of claims 2-6, characterised in that the air suction chamber (9) extends in a conically tapering manner relative to the ventilator exhaust chamber (13).
8. Apparatus according to one of claims 1-7, characterised in that an air recycling chamber (14) is associated with the radial fan (11, 12) as two ducts (15, 16) for both sides of the web of material (4).
9. Apparatus according to claim 8, characterised in that the air return ducts (15, 16) are spaced from each other and are disposed adjacent to the housing wall (1).
10. Apparatus according to claim 9, characterised in that a sealable aperture (18) is disposed in the centre of the end face of the housing wall (1) and the air return ducts (15, 16) are disposed laterally thereof.
11. Apparatus according to one of claims 8 - 10, charactarised in that the air return ducts (15, 16) are covered at their upper ends by a perforated plate (19) and discharge at their lower ends laterally into the treatment region of the drying shaft.
12. Apparatus according to one of claims 1-11, characterisad in that a heating means (24, 25) extends beyond the treatment width parallel to the drying air inlet aperture in the air conduction compartment (26, 27) beyond the cross-section of the air conduction compartment (26, 27).
13. Apparatus according to claim 12, characterised in that a baffle chamber (20, 21) is disposed parallel to the working width below the heating means and is separated at the upper end by a perforated cover (22, 23).
14. Apparatus according to claim 1, characterised in that the discharge openings in the air conduction compartment (26, 27) are in the form of slots (8) which extend transversely over the working width.
15. Apparatus according to claim 14, characterised in that the slots (8) are inclined so as to slope upwardly in the conveying direction of the material.
16. Apparatus according to one of claims 13-15, characterised in that discharge openings are also formed as slots (7') in the wall defining the baffle chamber (20, 21) relative to the treatment region.
17. Apparatus according to one of claims 1-16, characterised in that a door (28, 29) which extends over the depth of the air conduction compartment (26, 27) is formed on the respective air return duct (15, 16) above the heating means (24, 25) which is disposed in the treatment region, in the wall of the air conduction compartment (26, 27) and pivots upwardly in the direction of the housing wall (1).
EP84111229A 1983-09-23 1984-09-20 Vertical dryer Expired EP0141227B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3334381 1983-09-23
DE19833334381 DE3334381A1 (en) 1983-09-23 1983-09-23 DRYING CHAMBER

Publications (3)

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EP0141227A2 EP0141227A2 (en) 1985-05-15
EP0141227A3 EP0141227A3 (en) 1986-01-08
EP0141227B1 true EP0141227B1 (en) 1987-11-04

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EP84111229A Expired EP0141227B1 (en) 1983-09-23 1984-09-20 Vertical dryer

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EP (1) EP0141227B1 (en)
DE (2) DE3334381A1 (en)

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
DE3811620A1 (en) * 1988-04-07 1989-10-26 Vits Maschinenbau Gmbh METHOD AND DEVICE FOR HEAT TREATMENT AND / OR DRYING A CONTINUOUS MATERIAL RAIL
CA2024820A1 (en) * 1989-09-08 1991-03-09 Robert E. Treleven Infrared drying system
DE4000622A1 (en) * 1990-01-11 1991-07-18 Fleissner Maschf Ag DRYING CHAMBER
US5228210A (en) * 1990-08-04 1993-07-20 Agfa-Gevaert Ag Method of and apparatus for drying for film developing device
DE4244003A1 (en) * 1992-12-24 1994-06-30 Platsch Hans G Radiation dryer bar and radiation dryer with such
US5867920A (en) * 1997-02-05 1999-02-09 Megtec Systems, Inc. High speed infrared/convection dryer
US6049995A (en) * 1999-04-20 2000-04-18 Megtec Systems, Inc. Infrared dryer with air purge shutter
CN100349737C (en) * 2005-06-02 2007-11-21 郝强 Horizontal circular-net high-temperature baking box
US20080184589A1 (en) * 2007-02-02 2008-08-07 The Shivvers Group, Inc., An Iowa Corporation High efficiency drier with heating and drying zones

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Publication number Priority date Publication date Assignee Title
DE94150C (en) *
US3590495A (en) * 1969-05-02 1971-07-06 Goodyear Tire & Rubber Dryer or heater with shielding means
DE2320479A1 (en) * 1973-04-21 1974-11-07 Vepa Ag Thermal treatment of textile materials - by tuyeres disposed along the material with openings directed on the material
US3900959A (en) * 1973-05-07 1975-08-26 Minnesota Mining & Mfg Combined infra-red and air flow drying for photographic film
FR2391437A1 (en) * 1977-05-18 1978-12-15 Air Ind IMPROVEMENTS TO TREATMENT FACILITIES FOR A PRODUCT IN A GASEOUS MEDIUM
US4336279A (en) * 1978-07-04 1982-06-22 Metzger Wesley A Apparatus and process for drying and curing coated substrates
US4257172A (en) * 1979-01-22 1981-03-24 Olympic Infra-Dry Inc. Combination forced air and infrared dryer

Also Published As

Publication number Publication date
DE3334381A1 (en) 1985-04-11
US4658512A (en) 1987-04-21
EP0141227A2 (en) 1985-05-15
EP0141227A3 (en) 1986-01-08
DE3467241D1 (en) 1987-12-10

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