EP0303887B1 - Apparatus for the heat treatment of a web of material - Google Patents

Apparatus for the heat treatment of a web of material Download PDF

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Publication number
EP0303887B1
EP0303887B1 EP88112556A EP88112556A EP0303887B1 EP 0303887 B1 EP0303887 B1 EP 0303887B1 EP 88112556 A EP88112556 A EP 88112556A EP 88112556 A EP88112556 A EP 88112556A EP 0303887 B1 EP0303887 B1 EP 0303887B1
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EP
European Patent Office
Prior art keywords
bypass
fan
opening
housing
fan housing
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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 - Lifetime
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EP88112556A
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German (de)
French (fr)
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EP0303887A1 (en
Inventor
Harry Gresens
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Brueckner Trockentechnik GmbH and Co KG
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Brueckner Trockentechnik GmbH and Co KG
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Priority to AT88112556T priority Critical patent/ATE68872T1/en
Publication of EP0303887A1 publication Critical patent/EP0303887A1/en
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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

Definitions

  • the invention relates to a device (according to the preamble of claim 1) for the heat treatment of a continuously moving web.
  • the drying air is circulated in the individual fields by means of fans, and a bypass flap can be provided in order to redirect the drying air during production so that it no longer passes through the Nozzles are blown onto the web.
  • the bypass flap is provided in the F-shaped transition piece between the fan housing and the nozzle boxes arranged above it.
  • a bypass opening is provided in the F-shaped transition piece provided between the fan housing and the nozzle boxes arranged above it, immediately adjacent to the entrance of each nozzle box.
  • a common bypass flap for partially or completely closing the nozzle box inlet or the bypass opening is assigned to the entrance of each nozzle box and the bypass opening arranged next to it.
  • the bypass flaps can be controlled by drives in such a way that the nozzle box inlets are opened and the bypass openings are closed during normal operation of the device, while the nozzle box inlets are closed when the device is at a standstill and the bypass openings are opened so that a direct connection to the return flow space can be established when the device is at a standstill. In this way, similar operating and operating conditions result as in the previously described embodiments known from practice.
  • a bypass secondary duct is provided, the inlet opening in the vicinity of the bypass opening can be closed or opened by a special design on the one hand of this secondary duct and on the other hand the outside of the throttle valve assigned to the lower nozzle box .
  • the throttle flaps assigned to the upper and lower nozzle boxes are completely closed - by separate motor drives or a common drive - when the bypass opening is to be opened while being opened again to the same extent as the bypass opening is closed.
  • the invention is therefore based on the object, while avoiding the disadvantages of the known designs, to design a device of the type mentioned in the preamble of claim 1 such that, with a simplified design of the device, the air flowing out through the open bypass opening practically does not come into contact with the web is coming.
  • bypass opening By arranging the bypass opening to be opened or blocked by a bypass flap in the lower region of the fan housing, specifically in one side wall, this can be done this bypass opening when the bypass flap is open, the circulating air (as well as the fan housing in the lower part of the device) reaches the suction opening of the return air duct without coming into contact with the material web in the upper part of the device, which means that when the Bypass flap achieves a real bypass flow of the circulating air and any influence of the drying air on the stationary web is avoided.
  • the arrangement of the bypass opening in the lower area of the fan housing, ie on one of the inlet side of the nozzle boxes, is proportionate distant location also allows (in particular in connection with some other design features yet to be discussed) when the bypass flap is open, a pressure reduction on the inlet side of the nozzle boxes that is so large that even when the throttle valves are open, no appreciable air flow enters the nozzle boxes.
  • the solution according to the invention thus opens up the possibility of not having to close the throttle flaps when the bypass flaps are opened (thus leaving the throttle flaps in their normal operating position during bypass operation), which leads to a significantly simplified construction and control.
  • the fan housing is rectangular in a vertical longitudinal section, the bypass opening being arranged in a side wall of this fan housing, which is formed by a flat, vertically arranged surface.
  • the suction opening of a return air duct is located directly opposite the bypass opening of the adjacent treatment zone, at approximately the same height (in the lower part of the tensioning machine) and at a relatively short distance.
  • the bypass air flowing out through the bypass opening reaches the return air duct of the adjacent treatment zone in the shortest possible way (and practically without any contact with the material web located much higher than the flow path of the bypass air).
  • a tensioning machine dryer is shown as a device for the heat treatment of a continuously moving web 1, which contains a plurality of treatment zones 2, 2a, 2b, etc., which follow one another in the direction of movement of the web.
  • It contains a fan 3 which serves to promote a circulating air flow and which is driven by a motor 5 arranged outside the machine housing 4.
  • the fan 5 is arranged in a fan housing 6 which has a rectangular shape in a vertical longitudinal section (perpendicular to the plane of the drawing in FIG. 2).
  • the fan housing 6 At the top of the fan housing 6 there is an F-shaped transition piece 7, with which a group of upper nozzle boxes 8 and lower nozzle boxes 9 are connected (the individual nozzle boxes belonging to a group lie in the direction of movement of the web, ie perpendicular to the plane of the drawing) Fig.1, a short distance behind each other).
  • a return air duct 11 which is provided at one end with one or two suction openings 12a, 12b closed by a grille and at its other end via a connecting piece 13 with the suction side of the fan 3 connected is.
  • adjustable throttle valves 14, 15 are arranged, which can be pivoted about axes 14a, 15a and, depending on their position, the air flow entering the nozzle boxes 8 and 9, respectively throttle more or less.
  • the fans (e.g. 3, 3a) of adjacent treatment zones (e.g. 2, 2a) are each arranged on different long sides of the device.
  • An approximately rectangular bypass opening is provided in the side wall of the fan housing 6 facing the return air duct (e.g. 11a) of the adjacent treatment zone (e.g. 2a), which can be opened or closed by a bypass flap 16.
  • the bypass opening of the fan housing 6 which is opened or closed by the bypass flap 16 is located directly opposite (and, as can be seen from FIG. 1, at approximately the same height) to the suction opening 12a of the return air duct 11a the neighboring treatment zone.
  • the side wall of the fan housing provided with the bypass opening is replaced by a flat, vertically arranged one Surface formed.
  • the bypass flap 16 can be pivoted by means of a vertical actuating shaft 17, which is mounted in the machine housing 4, the upper end of this actuating shaft 17, which is used to engage a pneumatic or electrical actuator, being passed through the ceiling of the machine housing 4.
  • a bypass opening with a bypass flap 16, 16 ' is provided in both side walls of the fan housing 6 facing the return air ducts of the adjacent treatment zones.
  • the return air duct 11 can, as already mentioned above, also be provided on both sides with a suction opening 12a, 12b, but it is in principle also possible to make do with a single suction opening 12a.
  • bypass flaps 16 are closed and the throttle flaps 14, 15 are more or less open.
  • the drying air circulated by the fan 3 is blown through the nozzle boxes 8 and 9 onto the material web 1 and passes through the return air duct 11 back to the fan 3 (filter and heating devices can be provided in the return air duct 11 in a known manner).
  • bypass flaps 16, 16 ' open, while the throttle valves 14, 15 can remain in their operating position if desired.
  • the pressure in the fan housing 6 and in particular in the F-shaped transition piece 7 located above it completely collapses, so that practically no air flows into the nozzle boxes 8 and 9 even when the throttle valves 14, 15 are open .
  • the drying air circulated by the fan 3 rather exits through the open bypass flaps 16, 16 '(cf. arrows 18 in FIG. 2) and reaches the directly opposite suction openings 12a, 12b of the adjacent return air ducts by the shortest route. In this way there is a circulation of the bypass air in the lower area of the chamber 10, i.e. far below the web 1, which is practically not touched by the bypass air. In this way, an undesirable exposure to air of the stationary web is definitely avoided.

Abstract

The invention relates to an apparatus for the heat treatment of a continuously moving web of material (1), in which a bypass flap (16) for closing or opening a bypass opening provided in the fan housing (6) is provided, which is arranged lower than the web of material (1). In this manner, the flow path (18) of the bypass air is formed, in bypass operation, exclusively in the lower region of the chamber (10) so that the web of material (1) is not affected by the bypass air.

Description

Die Erfindung betrifft eine Vorrichtung (entsprechend dem Oberbegriff des Anspruches 1) zur Wärmebehandlung einer kontinuierlich bewegten Warenbahn.The invention relates to a device (according to the preamble of claim 1) for the heat treatment of a continuously moving web.

Bei aus der Praxis bekannten Vorrichtungen, insbesondere Spannmaschinentrocknern, wird die Trocknungsluft in den einzelnen Feldern mittels Ventilatoren umgewälzt, wobei eine Bypass-Klappe vorgesehen sein kann, um bei einem Stillstand der Spannmaschine während der Produktion die Trocknungsluft so umzuleiten, daß sie nicht mehr durch die Düsen auf die Warenbahn geblasen wird. Dabei ist die Bypass-Klappe in dem F-förmig gestalteten Übergangsstück zwischen dem Ventilatorgehäuse und den darüber angeordneten Düsenkästen vorgesehen. Eine derartige Ausführung ist mit verschiedenen Nachteilen behaftet.In devices known from practice, in particular clamping machine dryers, the drying air is circulated in the individual fields by means of fans, and a bypass flap can be provided in order to redirect the drying air during production so that it no longer passes through the Nozzles are blown onto the web. The bypass flap is provided in the F-shaped transition piece between the fan housing and the nozzle boxes arranged above it. Such an embodiment has various disadvantages.

Die durch die geöffnete Bypass-Klappe austretende Trocknungsluft wird zwar nicht durch die Düsenkästen auf die Warenbahn geblasen, tritt jedoch in den auch die Warenbahn enthaltenden oberen Bereich des Spannmaschinenfeldes aus. Wenn diese Bypass-Luft aus diesem oberen Bereich des Spannmaschinenfeldes zu der im unteren Teil des Spannmaschinenfeldes befindlichen Ansaugöffnung des Rückluftkanales zurückströmt, kommt sie zwangsläufig mit der Warenbahn in Berührung, was den erwünschten Bypass-Effekt beeinträchtigt.The drying air escaping through the open bypass flap is not blown through the nozzle boxes onto the web, but exits into the upper area of the tensioning machine field which also contains the web. When this bypass air flows back from this upper area of the stenter field to the suction opening of the return air duct located in the lower part of the stenter field, it inevitably comes into contact with the web, which impairs the desired bypass effect.

Nachteilig ist weiterhin, daß eine im Übergangsstück zwischen Ventilator und Düsenkästen angeordnete Bypass-Klappe aus konstruktiven Gründen (bedingt durch die Anordnung und Größe dieser Bypass-Klappe) keinen so vollständigen Druckabbau am Eintritt der Düsenkästen ermöglicht, daß ohne Schließen der vor den Düsenkästen befindlichen Drosselklappen ein Luftaustritt durch die Düsen verhindert werden kann. Um einen solchen Luftaustritt durch die Düsen bei geöffneter Bypass-Klappe vollständig auszuschließen, müssen daher bei diesen bekannten Ausführungen die Drosselklappen der Düsenkästen geschlossen werden. Da jedoch diese Drosselklappen im Betrieb im allgemeinen in einer Zwischenstellung stehen und beim Wiederanfahren der Maschine und Schließen der Bypass-Klappe wieder in diese zuvor vorhandene Zwischenstellung gebracht werden müssen, ist bei den bekannten Ausführungen eine komplizierte Steuereinrichtung für die Betätigung der Drosselklappen in Verbindung mit dem Öffnen und Schließen der Bypass-Klappen notwendig.Another disadvantage is that one in the transition piece Bypass flap arranged between the fan and the nozzle boxes, for constructional reasons (due to the arrangement and size of this bypass flap), does not allow the pressure at the inlet of the nozzle boxes to be so complete that an air leakage through the nozzles can be prevented without closing the throttle valves located in front of the nozzle boxes . In order to completely rule out such air leakage through the nozzles when the bypass flap is open, the throttle flaps of the nozzle boxes must therefore be closed in these known designs. However, since these throttle valves are generally in an intermediate position during operation and must be brought back into this previously existing intermediate position when the machine is restarted and the bypass valve is closed, in the known designs a complicated control device for actuating the throttle valves in connection with the Opening and closing of the bypass flaps is necessary.

Bei der aus der GB-A-21 47 629 bekannten Wärmebehandlungsvorrichtung ist in dem zwischen dem Ventilatorgehäuse und den darüber angeordneten Düsenkästen vorgesehenen, F-förmig gestalteten Übergangsstück unmittelbar angrenzend an den Eingang jedes Düsenkastens eine Bypass-Öffnung vorgesehen. Dem Eingang jedes Düsenkastens und der daneben angeordneten Bypass-Öffnung ist eine gemeinsame Bypass-Klappe zum teilweisen oder vollständigen Verschließen des Düsenkasteneingangs bzw. der Bypass-Öffnung zugeordnet. Durch Antriebe können die Bypass-Klappen so gesteuert werden, daß bei Normalbetrieb der Vorrichtung die Düsenkasteneingänge geöffnet und die Bypass-Öffnungen geschlossen sind, während bei Stillstand der Vorrichtung die Düsenkasteneingänge geschlossen und die Bypass-Öffnungen geöffnet sind, damit bei Stillstand der Vorrichtung eine direkte Verbindung zum Rückströmraum herstellbar ist. Auf diese Weise ergeben sich ähnliche Betriebs- und Wirkungsverhältnisse wie bei den zuvor erläuterten, aus der Praxis bekannten Ausführungsformen.In the heat treatment device known from GB-A-21 47 629, a bypass opening is provided in the F-shaped transition piece provided between the fan housing and the nozzle boxes arranged above it, immediately adjacent to the entrance of each nozzle box. A common bypass flap for partially or completely closing the nozzle box inlet or the bypass opening is assigned to the entrance of each nozzle box and the bypass opening arranged next to it. The bypass flaps can be controlled by drives in such a way that the nozzle box inlets are opened and the bypass openings are closed during normal operation of the device, while the nozzle box inlets are closed when the device is at a standstill and the bypass openings are opened so that a direct connection to the return flow space can be established when the device is at a standstill. In this way, similar operating and operating conditions result as in the previously described embodiments known from practice.

In der nicht vorveröffentlichten GB-A-21 94 030 ist ferner eine z. T. ähnliche Vorrichtung beschrieben, in der oberhalb und unterhalb der Warenbahn-Transportebene obere und untere Düsenkästen vorgesehen sind, vor deren Lufteinströmöffnung je eine einstellbare Drosselklappe angeordnet ist. Im Bereich zwischen der Oberseite des dortigen Ventilatorgehäuses und der Zuströmöffnung des unteren Düsenkastens ist eine Bypass-Öffnung in der Weise vorgesehen, daß sie durch die der Zuströmöffnung zum unteren Düsenkasten zugeordnete Drosselklappe - gegensinnig zu dieser Zuströmrichtung - geschlossen bzw. geöffnet werden kann. Außerdem ist im Bereich des unteren Düsenkastens sowie zwischen der Bypass-Öffnung und einem hinteren Luft-Rückstromraum ein Bypass-Nebenkanal vorgesehen, dessen in der Nähe der Bypass-Öffnung liegende Einlaßöffnung durch eine besondere Gestaltung einerseits dieses Nebenkanales und andererseits der Außenseite der dem unteren Düsenkasten zugeordneten Drosselklappe verschlossen oder geöffnet werden kann. Auch bei dieser bekannten Ausführung werden die den oberen und unteren Düsenkästen zugeordneten Drosselklappen - durch gesonderte motorische Antriebe oder einen gemeinsamen Antrieb - vollkommen geschlossen, wenn die Bypass-Öffnung geöffnet werden soll, während sie in dem Maße wieder geöffnet werden, wie die Bypass-Öffnung verschlossen wird.In the non-prepublished GB-A-21 94 030 a z. T. similar device described, in which above and below the web transport plane upper and lower nozzle boxes are provided, in front of the air inflow opening an adjustable throttle valve is arranged. In the area between the top of the fan housing there and the inflow opening of the lower nozzle box, a bypass opening is provided in such a way that it can be closed or opened by the throttle valve associated with the inflow opening to the lower nozzle box - in the opposite direction to this inflow direction. It is also in the area of the lower nozzle box and between the bypass opening and a rear air backflow space, a bypass secondary duct is provided, the inlet opening in the vicinity of the bypass opening can be closed or opened by a special design on the one hand of this secondary duct and on the other hand the outside of the throttle valve assigned to the lower nozzle box . Also in this known embodiment, the throttle flaps assigned to the upper and lower nozzle boxes are completely closed - by separate motor drives or a common drive - when the bypass opening is to be opened while being opened again to the same extent as the bypass opening is closed.

Der Erfindung liegt daher die Aufgabe zugrunde, unter Vermeidung der Nachteile der bekannten Ausführungen eine Vorrichtung der im Oberbegriff des Anspruches 1 genannten Art so auszubilden, daß bei vereinfachter Bauweise der Vorrichtung die durch die geöffnete Bypass-Öffnung ausströmende Luft mit der Warenbahn praktisch nicht in Berührung kommt.The invention is therefore based on the object, while avoiding the disadvantages of the known designs, to design a device of the type mentioned in the preamble of claim 1 such that, with a simplified design of the device, the air flowing out through the open bypass opening practically does not come into contact with the web is coming.

Dies Aufgabe wird erfindungsgemäß durch die kennzeichenden Merkmale des Anspruches 1 gelöst.This object is achieved according to the invention by the characterizing features of claim 1.

Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Appropriate embodiments of the invention are the subject of the dependent claims.

Indem die durch eine Bypass-Klappe zu öffnende bzw. abzusperrende Bypass-Öffnung im unteren Bereich des Ventilatorgehäuses, und zwar in dessen einer Seitenwand, angeordnet ist, kann die aus dieser Bypass-Öffnung bei geöffneter Bypass-Klappe ausströmende Umluft zu der (ebenso wie das Ventilatorgehäuse im unteren Teil der Vorrichtung befindlichen) Ansaugöffnung des Rückluftkanales gelangen, ohne hierbei mit der im oberen Teil der Vorrichtung befindlichen Warenbahn in Berührung zu kommen, wodurch also bei geöffneter Bypass-Klappe eine echte Bypass-Strömung der Umluft erreicht und jegliche Einwirkung der Trockungsluft auf die stillstehende Warenbahn vermieden wird.By arranging the bypass opening to be opened or blocked by a bypass flap in the lower region of the fan housing, specifically in one side wall, this can be done this bypass opening when the bypass flap is open, the circulating air (as well as the fan housing in the lower part of the device) reaches the suction opening of the return air duct without coming into contact with the material web in the upper part of the device, which means that when the Bypass flap achieves a real bypass flow of the circulating air and any influence of the drying air on the stationary web is avoided.

Die Anordnung der Bypass-Öffnung im unteren Bereich des Ventilatorgehäuses, d.h. an einer von der Eintrittsseite der Düsenkästen verhältnismäßig weit entfernten Stelle ermöglicht ferner (insbesondere in Verbindung mit einigen weiteren, noch zu erörternden konstruktiven Merkmalen) bei geöffneter Bypass-Klappe einen so weitgehenden Druckabbau an der Eintrittsseite der Düsenkästen, daß auch bei geöffneten Drosselklappen kein nennenswerter Luftstrom in die Düsenkästen eintritt. Die erfindungsgemäße Lösung eröffnet damit die Möglichkeit, auf ein Schließen der Drosselklappen beim Öffnen der Bypass-Klappen zu verzichten (die Drosselklappen somit während des Bypass-Betriebes in ihrer normalen Betriebsstellung zu belassen), was zu einer wesentlich vereinfachten Konstruktion und Steuerung führt.The arrangement of the bypass opening in the lower area of the fan housing, ie on one of the inlet side of the nozzle boxes, is proportionate distant location also allows (in particular in connection with some other design features yet to be discussed) when the bypass flap is open, a pressure reduction on the inlet side of the nozzle boxes that is so large that even when the throttle valves are open, no appreciable air flow enters the nozzle boxes. The solution according to the invention thus opens up the possibility of not having to close the throttle flaps when the bypass flaps are opened (thus leaving the throttle flaps in their normal operating position during bypass operation), which leads to a significantly simplified construction and control.

Gemäß einer zweckmäßigen Ausgestaltung der Erfindung ist das Ventilatorgehäuse in einem vertikalen Längsschnitt rechteckig gestaltet, wobei die Bypass-Öffnung in einer Seitenwand dieses Ventilatorgehäuses angeordnet ist, die durch eine ebene, vertikal angeordnete Fläche gebildet wird. Eine solche Ausführung ermöglicht auf einfache Weise eine besonders große Bypass-Öffnung in unmittelbarer Nähe der druckerzeugenden Ventilatorschaufeln. Die gesamte durch den Ventilator geförderte Luft tritt auf diese Weise bei geöffneter Bypass-Klappe durch die Bypass-Öffnung aus, während an der Eintrittsseite der wesentlich höher angeordneten Düsenkästen der Druck und damit die Düsenströmung vollständig zusammenbricht.According to an expedient embodiment of the invention, the fan housing is rectangular in a vertical longitudinal section, the bypass opening being arranged in a side wall of this fan housing, which is formed by a flat, vertically arranged surface. Such a design enables a particularly large bypass opening in the immediate vicinity of the pressure-generating fan blades in a simple manner. In this way, all the air conveyed by the fan exits through the bypass opening when the bypass flap is open, while the pressure and thus the nozzle flow completely collapse on the inlet side of the much higher nozzle boxes.

Sind die Ventilatoren benachbarter Behandlungszonen jeweils an unterschiedlichen Längsseiten der Vorrichtung angeordnet, so befindet sich die Ansaugöffnung eines Rückluftkanales jeweils direkt gegenüberliegend zur Bypass-Öffnung der benachbarten Behandlungszone, und zwar auf etwa gleicher Höhe (im unteren Teil der Spannmaschine) und in verhältnismäßig kurzer Entfernung. Die durch die Bypass-Öffnung ausströmende Bypass-Luft gelangt infolgedessen auf kürzestem Wege (und praktisch ohne jede Berührung mit der wesentlich höher als der Strömungsweg der Bypass-Luft befindlichen Warenbahn) in den Rückluftkanal der benachbarten Behandlungszone.If the fans of adjacent treatment zones are each arranged on different long sides of the device, the suction opening of a return air duct is located directly opposite the bypass opening of the adjacent treatment zone, at approximately the same height (in the lower part of the tensioning machine) and at a relatively short distance. As a result, the bypass air flowing out through the bypass opening reaches the return air duct of the adjacent treatment zone in the shortest possible way (and practically without any contact with the material web located much higher than the flow path of the bypass air).

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung veranschaulicht. Es zeigen

Fig.1
einen Querschnitt durch eine Behandlungszone der erfindungsgemäßen Vorrichtung,
Fig.2
einen Längsschnitt (längs der Linie II-II der Fig.1).
An embodiment of the invention is illustrated in the drawing. Show it
Fig. 1
3 shows a cross section through a treatment zone of the device according to the invention,
Fig. 2
a longitudinal section (along the line II-II of Fig.1).

Als Vorrichtung zur Wärmebehandlung einer kontinuierlich bewegten Warenbahn 1 ist ein Spannmaschinentrockner dargestellt, der eine Vielzahl von in Bewegungsrichtung der Warenbahn aufeinanderfolgenden Behandlungszonen 2, 2a, 2b usw. enthält.A tensioning machine dryer is shown as a device for the heat treatment of a continuously moving web 1, which contains a plurality of treatment zones 2, 2a, 2b, etc., which follow one another in the direction of movement of the web.

Da diese Behandlungszonen gleichartig ausgebildet sind, sei im folgenden eine solche Zone näher erläutert.Since these treatment zones are designed in the same way, such a zone will be explained in more detail below.

Sie enthält einen zur Förderung eines Umluftstromes dienenden Ventilator 3, der durch einen außerhalb des Maschinengehäuses 4 angeordneten Motor 5 angetrieben wird.It contains a fan 3 which serves to promote a circulating air flow and which is driven by a motor 5 arranged outside the machine housing 4.

Der Ventilator 5 ist in einem Ventilatorgehäuse 6 angeordnet, das in einem vertikalen Längsschnitt (senkrecht zur Zeichenebene der Fig.2) Rechteckform besitzt.The fan 5 is arranged in a fan housing 6 which has a rectangular shape in a vertical longitudinal section (perpendicular to the plane of the drawing in FIG. 2).

An die Oberseite des Ventilatorgehäuses 6 schließt sich ein F-förmiges Übergangsstück 7 an, mit dem eine Gruppe von oberen Düsenkästen 8 und unteren Düsenkästen 9 verbunden sind (die einzelnen, zu einer Gruppe gehörenden Düsenkästen liegen in Bewegungsrichtung der Warenbahn, d.h. senkrecht zur Zeichenebene der Fig.1, mit geringem Abstand hintereinander).At the top of the fan housing 6 there is an F-shaped transition piece 7, with which a group of upper nozzle boxes 8 and lower nozzle boxes 9 are connected (the individual nozzle boxes belonging to a group lie in the direction of movement of the web, ie perpendicular to the plane of the drawing) Fig.1, a short distance behind each other).

Im unteren Bereich der vom Maschinengehäuse 4 umschlossenen Kammer 10 befindet sich ein Rückluftkanal 11, der an seinem einen Ende mit einer oder zwei durch ein Gitter verschlossenen Ansaugöffnungen 12a, 12b versehen ist und an seinem anderen Ende über einen Stutzen 13 mit der Saugseite des Ventilators 3 verbunden ist.In the lower area of the chamber 10 enclosed by the machine housing 4 there is a return air duct 11, which is provided at one end with one or two suction openings 12a, 12b closed by a grille and at its other end via a connecting piece 13 with the suction side of the fan 3 connected is.

In dem F-förmigen Übergangsstück 7 sind auf der Eintrittsseite der oberen und unteren Düsenkästen 8 bzw. 9 verstellbare Drosselklappen 14, 15 angeordnet, die um Achsen 14a, 15a schwenkbar sind und je nach ihrer Stellung den in die Düsenkästen 8 bzw. 9 eintretenden Luftstrom mehr oder weniger drosseln.In the F-shaped transition piece 7 on the inlet side of the upper and lower nozzle boxes 8 and 9, adjustable throttle valves 14, 15 are arranged, which can be pivoted about axes 14a, 15a and, depending on their position, the air flow entering the nozzle boxes 8 and 9, respectively throttle more or less.

Wie Fig.2 erkennen läßt, sind die Ventilatoren (z.B. 3, 3a) benachbarter Behandlungszonen (z.B. 2, 2a) jeweils an unterschiedlichen Längsseiten der Vorrichtung angeordnet.As can be seen in FIG. 2, the fans (e.g. 3, 3a) of adjacent treatment zones (e.g. 2, 2a) are each arranged on different long sides of the device.

In der dem Rückluftkanal (z.B. 11a) der benachbarten Behandlungszone (z.B. 2a) zugewandten Seitenwand des Ventilatorgehäuses 6 ist eine etwa rechteckige Bypass-Öffnung vorgesehen, die durch eine Bypass-Klappe 16 geöffnet oder abgesperrt werden kann. Wie Fig.2 erkennen läßt, befindet sich die durch die Bypass-Klappe 16 geöffnete oder geschlossene Bypass-Öffnung des Ventilatorgehäuses 6 unmittelbar gegenüberliegend (und, wie sich aus Fig.1 entnehmen läßt, auf etwa gleicher Höhe) zur Ansaugöffnung 12a des Rückluftkanales 11a der benachbarten Behandlungszone.An approximately rectangular bypass opening is provided in the side wall of the fan housing 6 facing the return air duct (e.g. 11a) of the adjacent treatment zone (e.g. 2a), which can be opened or closed by a bypass flap 16. As can be seen in FIG. 2, the bypass opening of the fan housing 6 which is opened or closed by the bypass flap 16 is located directly opposite (and, as can be seen from FIG. 1, at approximately the same height) to the suction opening 12a of the return air duct 11a the neighboring treatment zone.

Da das Ventilatorgehäuse 6 in einem vertikalen Längsschnitt rechteckig ist, wird die mit der Bypass-Öffnung versehene Seitenwand des Ventilatorgehäuses durch eine ebene, vertikal angeordnete Fläche gebildet.Since the fan housing 6 is rectangular in a vertical longitudinal section, the side wall of the fan housing provided with the bypass opening is replaced by a flat, vertically arranged one Surface formed.

Die Bypass-Klappe 16 ist mittels einer vertikalen Betätigungswelle 17 schwenkbar, die im Maschinengehäuse 4 gelagert ist, wobei das zum Angriff eines pneumatischen oder elektrischen Stellantriebes dienende obere Ende dieser Betätigungswelle 17 durch die Decke des Maschinengehäuses 4 hindurchgeführt ist.The bypass flap 16 can be pivoted by means of a vertical actuating shaft 17, which is mounted in the machine housing 4, the upper end of this actuating shaft 17, which is used to engage a pneumatic or electrical actuator, being passed through the ceiling of the machine housing 4.

Bei dem in der Zeichnung veranschaulichten Ausführungsbeispiel ist in beiden, den Rückluftkanälen der benachbarten Behandlungszonen zugewandten Seitenwänden des Ventilatorgehäuses 6 je eine Bypass-Öffnung mit einer Bypass-Klappe 16, 16′ vorgesehen. Der Rückluftkanal 11 kann hierbei, wie oben bereits erwähnt, gleichfalls auf beiden Seiten mit je einer Ansaugöffnung 12a, 12b versehen sein, doch ist es grundsätzlich auch möglich, mit einer einzigen Ansaugöffnung 12a auszukommen.In the exemplary embodiment illustrated in the drawing, a bypass opening with a bypass flap 16, 16 'is provided in both side walls of the fan housing 6 facing the return air ducts of the adjacent treatment zones. The return air duct 11 can, as already mentioned above, also be provided on both sides with a suction opening 12a, 12b, but it is in principle also possible to make do with a single suction opening 12a.

Im Normalbetrieb der Spannmaschine sind die Bypassklappen 16 geschlossen und die Drosselklappen 14, 15 mehr oder weniger geöffnet. Die durch den Ventilator 3 umgewälzte Trocknungsluft wird durch die Düsenkästen 8 und 9 auf die Warenbahn 1 geblasen und gelangt durch den Rückluftkanal 11 zurück zum Ventilator 3 (im Rückluftkanal 11 können dabei in bekannter Weise Filter- und Heizeinrichtungen vorgesehen sein).During normal operation of the tensioning machine, the bypass flaps 16 are closed and the throttle flaps 14, 15 are more or less open. The drying air circulated by the fan 3 is blown through the nozzle boxes 8 and 9 onto the material web 1 and passes through the return air duct 11 back to the fan 3 (filter and heating devices can be provided in the return air duct 11 in a known manner).

Wird nun der Betrieb der Spannmaschine unterbrochen und die Warenbahn 1 stillgesetzt, so öffnen die Bypass-Klappen 16, 16′, während die Drosselklappen 14, 15 gewünschtenfalls in ihrer Betriebsstellung bleiben können. Durch das Öffnen der Bypass-Klappen 16, 16′ bricht der Druck im Ventilatorgehäuse 6 und insbesondere im darüber befindlichen F-förmigen Übergangsstück 7 vollständig zusammen, so daß auch bei geöffneten Drosselklappen 14, 15 praktisch keine Luft mehr in die Düsenkästen 8 und 9 einströmt. Die vom Ventilator 3 umgewälzte Trocknungsluft tritt vielmehr durch die geöffneten Bypass-Klappen 16, 16′ aus (vgl. die Pfeile 18 in Fig.2) und gelangt auf kürzestem Wege in die direkt gegenüberliegenden Ansaugöffnungen 12a, 12b der benachbarten Rückluftkanäle. Auf diese Weise ergibt sich eine Zirkulation der Bypassluft im unteren Bereich der Kammer 10, d.h. weit unterhalb der Warenbahn 1, die von der Bypassluft praktisch nicht berührt wird. Auf diese Weise wird eine unerwünschte Luftbeaufschlagung der stillstehenden Warenbahn mit Sicherheit vermieden.If the operation of the tensioning machine is now interrupted and the web 1 stopped, the bypass flaps 16, 16 'open, while the throttle valves 14, 15 can remain in their operating position if desired. By opening the bypass flaps 16, 16 ', the pressure in the fan housing 6 and in particular in the F-shaped transition piece 7 located above it completely collapses, so that practically no air flows into the nozzle boxes 8 and 9 even when the throttle valves 14, 15 are open . The drying air circulated by the fan 3 rather exits through the open bypass flaps 16, 16 '(cf. arrows 18 in FIG. 2) and reaches the directly opposite suction openings 12a, 12b of the adjacent return air ducts by the shortest route. In this way there is a circulation of the bypass air in the lower area of the chamber 10, i.e. far below the web 1, which is practically not touched by the bypass air. In this way, an undesirable exposure to air of the stationary web is definitely avoided.

Wird dann der Betrieb der Spannmaschine wieder aufgenommen, so schließen die Bypass-Klappen 16, 16′, so daß der Trocknungsluft in exakt gleicher Weise wie vor Unterbrechung des Betriebes durch die in der ursprünglichen Stellung befindlichen Drosselklappen 14, 15 zur Warenbahn 1 gelangt.Then the operation of the tensioning machine is resumed, so close the bypass flaps 16, 16 ', so that the drying air in exactly the same way as before interruption of operation by the throttle valves 14, 15 in the original position reaches the web 1.

Claims (7)

  1. Apparatus for heat treatment of a continuously moving length of material (1) by means of a circulating air stream, containing
    a) a fan (3) which serves to convey the circulating air stream and which is arranged inside a housing (6) which is in communication with the delivery side of the fan,
    b) at least one nozzle casing (8, 9) which is connected to the upper face of the fan housing (6) and serves for delivery of the air stream to the length of material and with which an adjustable throttle valve (14, 15) is co-ordinated,
    c) a return air channel (11) which is arranged lower than the nozzle casing (8, 9), is provided at one end with an intake opening (12a) and at its other end is connected to the intake side of the fan (3),
    d) a bypass opening which is provided lower than the length of material (1) and in the region of the fan housing (6) and can be opened and closed off by means of a valve (16),


    characterised in that
    e) the bypass opening is arranged in a side wall of the fan housing (6) and a bypass valve (16) which can be actuated independently of the throttle valve (14, 15) of the nozzle casing (8, 9) is provided for this bypass opening.
  2. Apparatus as claimed in claim 1 with several treatment zones (2, 2a, 2b) succeeding one another in the direction of movement of the length of material (1), each of these treatment zones containing a fan (3), at least one nozzle casing (8, 9), a return air channel (11) and a bypass valve (16), the fans (e.g. 3, 3a) being arranged in each case on different long sides of the apparatus, characterised in that the bypass opening is arranged in each case in the side wall of the fan housing (6) facing the return air channel (11a) of the adjacent treatment zone (2a).
  3. Apparatus as claimed in claim 2, characterised in that the intake opening (12a, 12b) is arranged in each case in the side wall of the return air channel (11a) facing the adjacent treatment zone.
  4. Apparatus as claimed in claim 2, characterised in that the side wall of the fan housing (6) - the said housing being rectangular in a vertical cross-section - which is provided with the bypass opening is formed by a flat vertically arranged surface.
  5. Apparatus as claimed in claim 2, characterised in that a bypass opening is arranged in each of the two side walls of the fan housing (6) facing the return air channels (11, 11a) of the adjacent treatment zones.
  6. Apparatus as claimed in claim 4, characterised in that the bypass valve (16) is pivotable by means of a vertical actuating shaft (17).
  7. Apparatus as claimed in claim 6, characterised in that the actuating shaft (17) of the bypass valve (16) is mounted in the machine housing (4) of the apparatus and the end of this actuating shaft which serves for the action of a pneumatic or electrical setting drive is passed through the cover of the machine housing (4).
EP88112556A 1987-08-16 1988-08-02 Apparatus for the heat treatment of a web of material Expired - Lifetime EP0303887B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88112556T ATE68872T1 (en) 1987-08-16 1988-08-02 DEVICE FOR THE HEAT TREATMENT OF A WEB.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873727280 DE3727280A1 (en) 1987-08-16 1987-08-16 DEVICE FOR HEAT TREATMENT OF A TRACK
DE3727280 1987-08-16

Publications (2)

Publication Number Publication Date
EP0303887A1 EP0303887A1 (en) 1989-02-22
EP0303887B1 true EP0303887B1 (en) 1991-10-23

Family

ID=6333854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112556A Expired - Lifetime EP0303887B1 (en) 1987-08-16 1988-08-02 Apparatus for the heat treatment of a web of material

Country Status (4)

Country Link
EP (1) EP0303887B1 (en)
AT (1) ATE68872T1 (en)
DE (2) DE3727280A1 (en)
ES (1) ES2026230T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19844692A1 (en) * 1998-09-29 2000-03-30 Brueckner Apparatebau Gmbh Device for the heat treatment of a web

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9300199A (en) * 1993-02-01 1994-09-01 Stork Contiweb Dryer with short restart.
DE19804396A1 (en) * 1998-02-04 1999-08-05 Brueckner Apparatebau Gmbh Device for the heat treatment of a web
US8222874B2 (en) 2007-06-26 2012-07-17 Vishay-Siliconix Current mode boost converter using slope compensation

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Publication number Priority date Publication date Assignee Title
FR1121824A (en) * 1954-04-05 1956-08-27 Advanced dryer
US4137649A (en) * 1973-04-21 1979-02-06 Vepa Ag Apparatus for the heat treatment of textiles
DE2705760A1 (en) * 1977-02-11 1978-08-17 Artos Meier Windhorst Kg DEVICE FOR DRYING WIDE-GUIDED TEXTILE TRAILS ETC.
DE3104556A1 (en) * 1980-12-03 1982-08-26 Brückner Trockentechnik GmbH & Co KG, 7250 Leonberg DEVICE FOR THE HEAT TREATMENT OF RAILWAY GOODS
DE3116838A1 (en) * 1981-04-28 1982-11-11 Brückner Trockentechnik GmbH & Co KG, 7250 Leonberg DEVICE FOR HOT-AIR DRYING OF TEXTILE GOODS
DE3336331C2 (en) * 1983-10-06 1985-12-05 A. Monforts GmbH & Co, 4050 Mönchengladbach Convection drying and / or setting machine
DE3419531A1 (en) * 1984-05-25 1985-11-28 Babcock Textilmaschinen GmbH, 2105 Seevetal ARRANGEMENT FOR PREVENTING DAMAGE TO PRODUCT LINES IN DRY HEAT TREATMENT BY MEANS OF FLOWING TREATMENT AGENTS
DE3627904A1 (en) * 1986-08-16 1988-02-18 Monforts Gmbh & Co A CONVECTION DRYING AND / OR FIXING MACHINE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19844692A1 (en) * 1998-09-29 2000-03-30 Brueckner Apparatebau Gmbh Device for the heat treatment of a web

Also Published As

Publication number Publication date
ES2026230T3 (en) 1992-04-16
DE3727280A1 (en) 1989-03-02
ATE68872T1 (en) 1991-11-15
EP0303887A1 (en) 1989-02-22
DE3865774D1 (en) 1991-11-28

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