EP0580547B1 - Mouthpiece for squeezing out devices for two component masses - Google Patents

Mouthpiece for squeezing out devices for two component masses Download PDF

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Publication number
EP0580547B1
EP0580547B1 EP93810389A EP93810389A EP0580547B1 EP 0580547 B1 EP0580547 B1 EP 0580547B1 EP 93810389 A EP93810389 A EP 93810389A EP 93810389 A EP93810389 A EP 93810389A EP 0580547 B1 EP0580547 B1 EP 0580547B1
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EP
European Patent Office
Prior art keywords
component
mouthpiece
outlet opening
tube
squeezing
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 - Lifetime
Application number
EP93810389A
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German (de)
French (fr)
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EP0580547A1 (en
Inventor
Volker Kopp
Werner Moser
Jürgen Kortenkamp
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Hilti AG
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Hilti AG
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Publication of EP0580547A1 publication Critical patent/EP0580547A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/918—Counter current flow, i.e. flows moving in opposite direction and colliding

Definitions

  • the invention relates to a mouthpiece for extrusion devices which serve to dispense two-component masses, according to the generic preamble of patent claim 1.
  • An extrusion device for two-component compositions is known, for example, from CH-PS 670 580.
  • such a device usually has a dispensing nozzle which is provided with an outlet opening for one component each.
  • the individual components are separated from each other inside the device and enter a mouthpiece through the respective outlet openings, which is connected to the device-side dispensing nozzle.
  • the two components are mixed within the mouthpiece, which is decisive for the final hardening.
  • the individual components are pressed out by applying a certain pressure generated in the device.
  • a print can be applied manually or with additionally supplied print media. If such pressure is applied without -
  • a mouthpiece with hardened components is removed prematurely, there is a risk that one of the components will strike back through the outlet opening of the other component into the extrusion device.
  • the components can be mixed within the extrusion device, so that curing takes place, for example, in the area of the extrusion mechanisms, which can lead to malfunctions in the extrusion device.
  • Such a fault is only possible by time-consuming dismantling and cleaning of the dispenser.
  • the components are kicked back arbitrarily, mostly depending on the viscosity differences and any pressure differences between the individual components.
  • GB-A-2 029 716 describes a generic mouthpiece in which a tube piece opens into a connecting tube to a mixing chamber.
  • the connecting pipe is used to supply one component.
  • the second component is introduced into the first component flowing past.
  • the two components are then transported together into an mixing chamber by an extension of the connecting pipe.
  • the pipe section is equipped with a one-way valve for the passage of the second component into the first component.
  • the outlet opening of the one-way valve is arranged in such a way that the flow direction of the second medium at the outlet of the one-way valve corresponds to the main direction of flow of the first medium.
  • the actual mixing of the two components should only take place in the connected mixing chamber. This is to prevent the two components from mixing and hardening already in the area around the one-way valve, because it should be possible at any time to dismantle the pipe section which is passed through the connecting tube at one knee area and fastened there with the one-way valve.
  • This known mouthpiece is intended for larger stationary systems and can only be used in connection with a connected mixing chamber.
  • FR-A-2 074 037 describes a mixing device for a plurality of components comprising an outer tube, in which at least one of the components is introduced through a coaxially arranged tube piece which is equipped with a one-way valve at its mouth.
  • the one-way valve comprises an axially arranged, prestressed membrane-like disk which closes the axial opening of the pipe section. Due to the pressure of an outflowing component, the membrane-like disc is raised in the edge region and opens a passage gap through which the component exits the medium flowing past at approximately a right angle. The membrane is opened in the main flow direction of the medium. As a result, there is always a risk that part of the medium will enter through the passage gap.
  • the invention has for its object to provide a mouthpiece for a squeezing device of the type described above, with which it is avoided that malfunctions caused by a kickback of component parts in the squeezing device occur.
  • the object is achieved in that the outlet of the one-way valve is arranged such that the outflow direction of the second component is opposite to the flow direction of the first component.
  • the mouthpiece with at least one one-way valve which cooperates with one of the outlet openings, has the consequence that at least one of the two components must first pass through the one-way valve and then mixed with the other component in the mixing tube.
  • the one-way valve only opens as long as the component flows through. As soon as the squeezing pressure is removed, the one-way valve closes, so that no further portion of the component can escape and, moreover, no portion of the other component comes from the mixing tube to the outlet opening assigned to the one-way valve.
  • This mouthpiece according to the invention is also a disposable part, which has to be removed from the pressing device after the pressing process has been interrupted. For the satisfactory functioning of the further squeezing process, it is necessary as before to provide the dispensing nozzle of the squeezing device with a new mouthpiece.
  • a one-way valve is expediently arranged at a distance from the connection point to a first outlet opening on a pipe section which is mounted coaxially in the mixing tube and can be connected to the corresponding outlet opening. It is thereby achieved that the two outlet openings on the device side are separated from one another, which is particularly advantageous if only one of the outlet openings interacts with a one-way valve. Only after the component passing through the pipe section has also passed through the one-way valve is it mixed with the other component located in the mixing pipe.
  • the pipe section is preferably arranged coaxially within the mixing pipe. This is the pipe section for the passage of one component and the annular space between the tube piece and the mixing tube are provided for the passage of the other component.
  • the annular space between the tube piece and the mouthpiece can at most be penetrated by ribs, which on the one hand serve to stabilize the tube piece, but on the other hand allow enough space for the passage of the one component between the tube piece and the mixing tube.
  • one or more openings on the pipe section that can be covered by an elastically deformable part are suitable as one-way valves.
  • These openings are advantageously radial passages which are arranged in the mouth region of the pipe section.
  • An elastically deformable part for these, for example, radially arranged passages is expediently an elastic sheath which surrounds the openings.
  • This elastic sleeve preferably has the shape of a tube.
  • the elastic sleeve is connected at its end area facing the mouth of the mixing tube to the mouth area of the pipe section and can be elastically deformed at its opposite end area by the pressure of the component flowing through the pipe section.
  • a quasi deflection baffle is thus formed for the component flowing through the pipe section, which on the one hand has an advantageous effect on the mixing process and on the other hand also has an advantageous effect on the closure to be formed by a proportion of hardened components.
  • a further one-way valve is expediently arranged in the area of the connection point to a second outlet opening.
  • this further one-way valve is arranged in the area of the connection point, there is still a spatial separation of the outlet points, ie in the present case the one-way valves.
  • the further one-way valve preferably has a bellows that is axially compressible by the pressure of the component flowing through the second outlet opening.
  • a bellows acts in the sense of an elastically deformable part analogous to the description in connection with the first one-way valve, only with the difference that the elastic bellows are axially deformable and the elastic sleeve is radially deformable. Due to the internal stress, the bellows covers the second outlet opening until compression occurs due to the pressure of the component flowing out through the outlet opening.
  • the mixing tube is advantageously made so long that the one-way valve or valves are sufficiently protruded from the mixing tube. This creates a sufficiently long mixing section, which guarantees sufficient mixing of the individual components.
  • the mouthpiece according to the invention is advantageously used in connection with an extrusion device which has a first outlet opening opening into the mixing tube and, upstream of this first outlet opening, coaxially in front of this first outlet opening and a second outlet opening opening into the tube section.
  • a device of this type can, for example, be designed in such a way that the outlet opening opening into the mixing tube is used for the delivery of prepolymer or similar resins and the outlet opening opening coaxially therewith is provided for the delivery of an activator.
  • the mouthpiece consists essentially of a mixing tube 1 and a tube piece 2.
  • the mouthpiece is connected to an extrusion device, the front part 3 of which is indicated by dash-dotted lines.
  • the front part 3 is indicated by a first outlet opening 3a (shown in the closed position) and a second outlet opening 3b upstream of this first outlet opening 3a coaxially in the squeezing direction.
  • the first outlet opening 3a opens into the squeezing tube 1 and the second outlet opening 3b opens into the pipe section 2.
  • the pipe section 2 is held and stabilized via ribs 4 in the mixing pipe 1. It is also shown how the pipe section 2 is provided with a bore 2a which tapers slightly in the pressing-out direction and which opens into radial passages 2b at its end pointing in the pressing-out direction. These passages 2b located in the mouth region of the pipe section 2 are surrounded by an elastic sheath 5. This elastic sleeve 5 is connected to the pipe section 2 at its end area facing the mouth of the mixing pipe 1, ie this end area is surrounded, for example, by projections 2c of the pipe section 2. The casing 5 can be clamped into the space formed by the projections 2c and, if necessary, additionally glued.
  • the envelope 5 is at its opposite end region radially expandable from the pressure of the component flowing through the pipe section 2, so that in this area the component emerging through the passages 2b can reach the mixing tube 1 after expansion of the casing 5 and mix there with the other component.
  • the end of the mixing tube 1 facing the dispenser can also be provided with one or more recesses distributed over the rear end face, for example in the form of notches 1a, so that 1 edges form on the rear end face of the mixing tube. These edges can be used to clean the respective area of the squeezing device by rotating the mixing tube 1 about its own axis so that residues of the individual components can be removed.
  • Fig. 2 shows another one-way valve for the second component.
  • the mouthpiece with its mixing tube 6 is connected to an extrusion device, the front part 7 of which is indicated by a dot-dash line.
  • the front part 7 is indicated with a first outlet opening 7a for the first component and a second outlet opening 7b - shown in the open position - for the second component, the first outlet opening 7a being arranged coaxially in the squeezing direction to the outlet opening 7b.
  • the first outlet opening 7a opens into a pipe section 8.
  • This pipe section 8 is provided with a bore 8a which tapers slightly in the direction of squeezing and which opens into radial passages at its end pointing in the direction of squeezing.
  • These passages located in the mouth area of the pipe section 8 are surrounded by an elastic cover.
  • the elastic sleeve can be radially deformed by the pressure of the component flowing through the bore.
  • the pipe section 8 is held and stabilized by means of ribs 8c which are supported on the mixing pipe 6.
  • the pipe section 8 In the area pointing counter to the pressing direction, the pipe section 8 is surrounded by a bellows 10. This bellows 10 axially covers the outlet opening 7b. The bellows 10 is axially compressed by the pressure of the component flowing through the outlet opening 7b, so that the component can emerge and flow in the pressing direction along the annular space between the bellows 10, the pipe section 8 and the mixing tube 6. In the area of the passages, the individual components flowing out of the passage openings 7a, 7b mix.
  • Plastic is a suitable material for the mixing pipe 1, 6 and the pipe section 2, 8.
  • the sleeve 5 and the bellows 10 are also advantageously formed from plastic, but from a highly elastic one.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Coating Apparatus (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Nozzles (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

For injection devices for two-component materials, a nozzle is provided within which the mixing of the individual components takes place. The nozzle has a mixing tube (1) for a first discharge opening (3a) and, arranged coaxially therewith, a tube piece (2) for a second discharge opening (3b) of the injection device. The pipe piece (2) is provided with a non-return valve which comprises passages (2b) of the pipe piece (2) and a sleeve (5) surrounding this region of the pipe piece (2). This non-return valve prevents a back-surge of the individual components and promotes the formation of a closure by a portion of cured components, so that even during actuation of the injection device with the nozzle, with cured components accumulated thereon, still mounted, no back-surge into the injection device occurs. <IMAGE>

Description

Die Erfindung betrifft ein Mundstück für Auspressgeräte, die dem Abgeben von Zweikomponenentenmassen dienen, gemäss dem gattungsbildenden Oberbegriff des Patentanspruches 1.The invention relates to a mouthpiece for extrusion devices which serve to dispense two-component masses, according to the generic preamble of patent claim 1.

Ein Auspressgerät für Zweikomponentenmassen ist beispielsweise aus der CH-PS 670 580 bekannt. Wie das Beispiel zeigt, weist ein solches Gerät üblicherweise eine Abgabedüse auf, die mit einer Austrittsöffnung je für eine Komponente versehen ist. Geräteintern sind die einzelnen Komponenten voneinander getrennt und treten durch die jeweiligen Austrittsöffnungen in ein Mundstück ein, welches an die geräteseitige Abgabedüse angeschlossen ist. Innerhalb des Mundstückes findet eine Vermischung der beiden Komponenten statt, welche für das schlussendliche Aushärten massgebend ist.An extrusion device for two-component compositions is known, for example, from CH-PS 670 580. As the example shows, such a device usually has a dispensing nozzle which is provided with an outlet opening for one component each. The individual components are separated from each other inside the device and enter a mouthpiece through the respective outlet openings, which is connected to the device-side dispensing nozzle. The two components are mixed within the mouthpiece, which is decisive for the final hardening.

Wird ein solch bekanntes Gerät während einiger Zeit nicht gebraucht, findet innerhalb des Mundstückes eine Aushärtung statt. Es ist somit erforderlich, ein solches, mit ausgehärteter Masse angefülltes Mundstück gegen ein neues auszutauschen, so dass der Auspressvorgang samt dem daran anschliessenden Mischvorgang innerhalb des neuen Mundstückes fortgesetzt werden kann.If such a known device is not used for some time, curing takes place within the mouthpiece. It is therefore necessary to exchange such a mouthpiece filled with hardened mass for a new one, so that the squeezing out process and the subsequent mixing process can be continued within the new mouthpiece.

Das Auspressen der einzelnen Komponenten erfolgt bei den bekannten Auspressgeräten durch Aufbringen eines bestimmten, im Gerät erzeugten Druckes. Ein solcher Druck kann manuell oder mit zusätzlich zugeführten Druckmedien aufgebracht werden. Wird ein solcher Druck aufgebracht, ohne dass - beispielsweise aus Versehen - ein Mundstück mit ausgehärteten Komponenten vorzeitig entfernt wird, besteht die Gefahr, dass eine der Komponenten durch die Austrittsöffnung der anderen Komponente in das Auspressgerät zurückschlägt. Dadurch kann innerhalb des Auspressgerätes eine Vermischung der Komponenten erfolgen, so dass beispielsweise im Bereich der Auspressmechanismen eine Aushärtung erfolgt, was zu Störungen des Auspressgerätes führen kann. Eine solche Störung ist nur durch zeitaufwendiges Demontieren und Reinigen des Auspressgerätes möglich. Das Zurückschlagen der Komponenten erfolgt dabei willkürlich, meistens in Abhängigkeit von den Viskositätsunterschieden und eventuellen Druckdifferenzen zwischen den einzelnen Komponenten.In the known extrusion devices, the individual components are pressed out by applying a certain pressure generated in the device. Such a print can be applied manually or with additionally supplied print media. If such pressure is applied without - For example, by mistake - a mouthpiece with hardened components is removed prematurely, there is a risk that one of the components will strike back through the outlet opening of the other component into the extrusion device. As a result, the components can be mixed within the extrusion device, so that curing takes place, for example, in the area of the extrusion mechanisms, which can lead to malfunctions in the extrusion device. Such a fault is only possible by time-consuming dismantling and cleaning of the dispenser. The components are kicked back arbitrarily, mostly depending on the viscosity differences and any pressure differences between the individual components.

In GB-A-2 029 716 ist ein gattungsgemässes Mundstück beschrieben, bei dem ein Rohrstück in ein Verbindungsrohr zu einer Mischkammer mündet. Das Verbindungsrohr dient zunächst der Zufuhr der einen Komponente. An der Mündung des Rohrstückes wird die zweite Komponente in die vorbeiströmende erste Komponente eingebracht. Darauf werden die beiden Komponenten gemeinsam durch eine Verlängerung des Verbindungsrohres in eine Mischkammer transportiert. Im Bereich seiner Mündung ist das Rohrstück mit einem Einwegventil für den Durchtritt der zweiten Komponente in die erste Komponente ausgerüstet. Bei diesem bekannten Mundstück ist die Austrittsöffnung des Einwegventiles derart angeornet, dass am Austritt des Einwegventiles die Strömungsrichtung des zweiten Mediums mit der Hauptströmungsrichtung des ersten Mediums übereinstimmt. Damit soll gewährleistet sein, dass die am Eiwegventil eingebrachte zweite Komponente durch die diese umströmende erste Komponente vom Einwegventil wegtransportiert wird. Die eigentliche Durchmischung der beiden Komponenten soll erst in der angeschlossenen Mischkammer erfolgen. Dadurch soll verhindert werden, dass sich die beiden Komponenten bereits im Bereich um das Einwegventil vermischen und aushärten, denn es soll jederzeit möglich sein, das an einem Kniebereich durch das Verbindungsrohr geführte und dort befestigte Rohrstück mit dem Einwegventil wieder auszubauen. Dieses bekannte Mundstück ist für grössere stationäre Anlagen vorgesehen und nur in Verbindung mit einer angeschlossenen Mischkammer einsetzbar.GB-A-2 029 716 describes a generic mouthpiece in which a tube piece opens into a connecting tube to a mixing chamber. The connecting pipe is used to supply one component. At the mouth of the pipe section, the second component is introduced into the first component flowing past. The two components are then transported together into an mixing chamber by an extension of the connecting pipe. In the area of its mouth, the pipe section is equipped with a one-way valve for the passage of the second component into the first component. In this known mouthpiece, the outlet opening of the one-way valve is arranged in such a way that the flow direction of the second medium at the outlet of the one-way valve corresponds to the main direction of flow of the first medium. This is to ensure that the second component introduced at the one-way valve is transported away from the one-way valve by the first component flowing around it. The actual mixing of the two components should only take place in the connected mixing chamber. This is to prevent the two components from mixing and hardening already in the area around the one-way valve, because it should be possible at any time to dismantle the pipe section which is passed through the connecting tube at one knee area and fastened there with the one-way valve. This known mouthpiece is intended for larger stationary systems and can only be used in connection with a connected mixing chamber.

In FR-A-2 074 037 ist eine ein äusseres Rohr umfassende Mischvorrichtung für mehrere Komponenten beschrieben, bei denen wenigstens eine der Komponenten durch ein koaxial angeordnetes Rohrstück eingebracht wird, welches an seiner Mündung mit einem Einwegventil ausgestattet ist. Das Einwegventil umfasst eine axial angeordnete, vorgespannte membranartige Scheibe, welche die axiale Öffnung des Rohrstückes verschliesst. Durch den Druck einer ausströmenden Komponente wird die membranartige Scheibe im Randbereich angehoben und gibt einen Durchtrittsspalt frei, durch den die Komponente etwa rechtwinkelig in das vorbeiströmende Medium austritt. Die Membran wird in die Hauptströmungsrichtung des Mediums geöffnet. Dadurch besteht immer die Gefahr, dass ein Teil des Mediums durch den Durchtrittsspalt eintritt. Bei der Verwendung dieser bekannten Mischvorrichtung für die Mischung von aushärtenden Reaktivkomponenten kann daher eine Aushärtung mit der damit verbundenen Funktionsbeeinträchtigung nicht vermieden werden.FR-A-2 074 037 describes a mixing device for a plurality of components comprising an outer tube, in which at least one of the components is introduced through a coaxially arranged tube piece which is equipped with a one-way valve at its mouth. The one-way valve comprises an axially arranged, prestressed membrane-like disk which closes the axial opening of the pipe section. Due to the pressure of an outflowing component, the membrane-like disc is raised in the edge region and opens a passage gap through which the component exits the medium flowing past at approximately a right angle. The membrane is opened in the main flow direction of the medium. As a result, there is always a risk that part of the medium will enter through the passage gap. When using this known mixing device for the mixture of curing reactive components, curing with the associated impairment of function cannot therefore be avoided.

Der Erfindung liegt die Aufgabe zugrunde, für ein Auspressgerät der vorgängig geschilderten Art ein Mundstück zu schaffen, mit welchem vermieden wird, dass es zu Störungen, hervorgerufen durch ein Zurückschlagen von Komponentenanteilen in das Auspressgerät, kommt.The invention has for its object to provide a mouthpiece for a squeezing device of the type described above, with which it is avoided that malfunctions caused by a kickback of component parts in the squeezing device occur.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass der Austritt des Einwegventiles derart angeordnet ist, dass die Ausströmrichtung der zweiten Komponente der Strömungsrichtung der ersten Komponente entgegengesetzt ist.According to the invention, the object is achieved in that the outlet of the one-way valve is arranged such that the outflow direction of the second component is opposite to the flow direction of the first component.

Das Mundstück mit wenigstens einem Einwegventil, das mit einer der Austrittsöffnungen zusammenwirkt, hat zur Folge, dass wenigstens eine der beiden Komponenten zuerst das Einwegventil passieren muss und danach eine Vermischung mit der anderen sich im Mischrohr befindlichen Komponente erfolgt. Das Einwegventil öffnet nur so lange, wie die Komponente durchströmt. Sobald der Auspressdruck weggenommen wird, schliesst das Einwegventil, so dass kein weiterer Anteil der Komponente austreten kann und darüber hinaus vom Mischrohr aber auch kein Anteil der anderen Komponente zu der dem Einwegventil zugeordneten Austrittsöffnung gerät. Indem der Austritt des Einwegventiles derart angeordnet ist, dass die Ausströmrichtung der zweiten Komponente der Strömungsrichtung der ersten Komponente entgegengesetzt ist, erfolgt bereits im Umgebungsbereich des Einwegventiles eine gute Durchmischung der beiden Komponenten. Wird der Auspressvorgang eine gewisse Zeit unterbrochen, so dass im Mundstück eine Aushärtung der vermischten Komponenten stattfindet, hat dies zur Folge, dass an jener Stelle, wo die einzelnen Komponenten erstmals zusammenfliessen, das heisst im Bereich des Einwegventils, die Aushärtung zuerst vonstatten geht. Es kann sich damit, insbesondere um das geöffnete Einwegventil herum, ein Anteil an ausgehärteten Komponenten bilden, welcher dann zur Folge hat, dass das Mischrohr durch den Anteil der ausgehärteten Komponenten zum Gerät hin verschlossen ist. Wird versehentlich ein derartig mit einem Anteil an ausgehärteten Komponenten angefülltes Mundstück vor Aufbringen des Auspressdruckes nicht gewechselt, hat dies lediglich zur Folge, dass die einzelnen Komponenten innerhalb des Mundstückes separiert bis zu dem von dem Anteil an ausgehärteten Komponenten gebildeten Verschluss gelangen, dass aber aufgrund der Separierung keine der Komponenten in den Bereich der jeweils anderen gelangen kann, so dass damit ein Zurückschlagen in das Auspressgerät vermieden wird.The mouthpiece with at least one one-way valve, which cooperates with one of the outlet openings, has the consequence that at least one of the two components must first pass through the one-way valve and then mixed with the other component in the mixing tube. The one-way valve only opens as long as the component flows through. As soon as the squeezing pressure is removed, the one-way valve closes, so that no further portion of the component can escape and, moreover, no portion of the other component comes from the mixing tube to the outlet opening assigned to the one-way valve. By arranging the outlet of the one-way valve such that the outflow direction of the second component is opposite to the flow direction of the first component, the two components are already thoroughly mixed in the area surrounding the one-way valve. If the squeezing process is interrupted for a certain time, so that the mixed components harden in the mouthpiece, this results in that at the point where the individual components flow together for the first time, i.e. in the area of the one-way valve, the curing takes place first. A portion of cured components can thus form, in particular around the open one-way valve, which then has the consequence that the mixing tube is closed to the device by the portion of the cured components. If a mouthpiece filled with a proportion of hardened components is not inadvertently replaced before the pressing-out pressure is applied, the only result is that the individual components within the mouthpiece separate up to the closure formed by the proportion of hardened components, but because of the Separation, none of the components can get into the area of the other, so that a kick back into the pressing device is avoided.

Auch bei diesem erfindungsgemässen Mundstück handelt es sich um ein Wegwerfteil, welches nach Unterbrechung des Auspressvorganges vom Auspressgerät entfernt werden muss. Für die zufriedenstellende Funktion des weiteren Auspressvorganges ist es wie bis anhin erforderlich, die Abgabedüse des Auspressgerätes mit einem neuen Mundstück zu versehen.This mouthpiece according to the invention is also a disposable part, which has to be removed from the pressing device after the pressing process has been interrupted. For the satisfactory functioning of the further squeezing process, it is necessary as before to provide the dispensing nozzle of the squeezing device with a new mouthpiece.

Zweckmässigerweise ist ein Einwegventil im Abstand von der Anschlussstelle zu einer ersten Austrittsöffnung an einem im Mischrohr koaxial gelagerten, mit der entsprechenden Austrittsöffnung verbindbaren Rohrstück angeordnet. Dadurch wird erreicht, dass es zu einer Abtrennung der beiden geräteseitigen Austrittsöffnungen voneinander kommt, was insbesondere dann von Vorteil ist, wenn nur eine der Austrittsöffnungen mit einem Einwegventil zusammenwirkt. Erst nachdem die das Rohrstück durchsetzende Komponente auch das Einwegventil passiert hat, erfolgt eine Vermischung mit der anderen sich im Mischrohr befindlichen Komponente.A one-way valve is expediently arranged at a distance from the connection point to a first outlet opening on a pipe section which is mounted coaxially in the mixing tube and can be connected to the corresponding outlet opening. It is thereby achieved that the two outlet openings on the device side are separated from one another, which is particularly advantageous if only one of the outlet openings interacts with a one-way valve. Only after the component passing through the pipe section has also passed through the one-way valve is it mixed with the other component located in the mixing pipe.

Um eine ausreichende Vermischung der einzelnen Komponenten zu erzielen, ist vorzugsweise das Rohrstück koaxial innerhalb des Mischrohres angeordnet. Damit ist das Rohrstück für den Durchtritt der einen Komponente und der Ringraum zwischen Rohrstück und Mischrohr für den Durchtritt der anderen Komponente vorgesehen. Der Ringraum zwischen Rohrstück und Mundstück kann allenfalls von Rippen durchsetzt sein, welche einerseits der Stabilisierung des Rohrstückes dienen, andererseits aber genügend Freiräume für den Durchtritt der einen Komponente zwischen Rohrstück und Mischrohr erlauben.In order to achieve sufficient mixing of the individual components, the pipe section is preferably arranged coaxially within the mixing pipe. This is the pipe section for the passage of one component and the annular space between the tube piece and the mixing tube are provided for the passage of the other component. The annular space between the tube piece and the mouthpiece can at most be penetrated by ribs, which on the one hand serve to stabilize the tube piece, but on the other hand allow enough space for the passage of the one component between the tube piece and the mixing tube.

Als Einwegventil bieten sich beispielsweise eine oder mehrere von einem elastisch verformbaren Teil abdeckbare Öffnungen am Rohrstück an. Vorteilhafterweise handelt es sich bei diesen Öffnungen um radiale Durchtritte, welche im Mündungsbereich des Rohrstückes angeordnet sind. Als elastisch verformbares Teil für diese beispielsweise radial angeordneten Durchtritte eignet sich zweckmässigerweise eine elastische Hülle, welche die Öffnungen umgibt. Diese elastische Hülle hat vorzugsweise die Gestalt eines Schlauches.For example, one or more openings on the pipe section that can be covered by an elastically deformable part are suitable as one-way valves. These openings are advantageously radial passages which are arranged in the mouth region of the pipe section. An elastically deformable part for these, for example, radially arranged passages is expediently an elastic sheath which surrounds the openings. This elastic sleeve preferably has the shape of a tube.

Hinsichtlich einer einwandfreien Funktion des Einwegventils wirkt es sich vorteilhaft aus, wenn die elastische Hülle an ihrem zur Mündung des Mischrohres weisenden Endbereich mit dem Mündungsbereich des Rohrstückes verbunden ist und an ihrem gegenüberliegenden Endbereich vom Druck der durch das Rohrstück strömenden Komponente elastisch verformt werden kann. Es bildet sich damit für die das Rohrstück durchströmende Komponente quasi eine Umlenkschikane, welche sich einerseits vorteilhaft auf den Mischvorgang auswirkt und andererseits sich aber auch vorteilhaft auf den von einem Anteil an ausgehärteten Komponenten zu bildenden Verschluss auswirkt.With regard to the proper functioning of the one-way valve, it is advantageous if the elastic sleeve is connected at its end area facing the mouth of the mixing tube to the mouth area of the pipe section and can be elastically deformed at its opposite end area by the pressure of the component flowing through the pipe section. A quasi deflection baffle is thus formed for the component flowing through the pipe section, which on the one hand has an advantageous effect on the mixing process and on the other hand also has an advantageous effect on the closure to be formed by a proportion of hardened components.

An sich reicht es zur Lösung der vorstehend geschilderten Aufgabe aus, nur eine der Austrittsöffnungen mit einem Einwegventil zu versehen. Um im Hinblick auf die jeweilige Gestaltung des Auspressgerätes sowie auf die von den Anwendung findenden Komponenten gestellten Anforderungen eine weitere Ausführungsform zur Verfügung zu stellen, ist zweckmässsigerweise ein weiteres Einwegventil im Bereich der Anschlussstelle zu einer zweiten Austrittsöffnung angeordnet. Nachdem dieses weitere Einwegventil im Bereich der Anschlussstelle angeordnet ist, findet nach wie vor eine räumliche Trennung der Austrittstellen, d.h. im vorliegenden Fall der Einwegventile, statt. Somit ist nebst der durch die Anordnung der Einwegventile erzielten Wirkungsweise, eine unerwünschte Vermischung der einzelnen Komponenten schon aus räumlichen Gründen unterbunden.In itself, it is sufficient to solve the problem described above, to provide only one of the outlet openings with a one-way valve. In order to provide a further embodiment in view of the respective design of the squeezing device and the requirements placed on the components by the application, a further one-way valve is expediently arranged in the area of the connection point to a second outlet opening. After this further one-way valve is arranged in the area of the connection point, there is still a spatial separation of the outlet points, ie in the present case the one-way valves. Thus, in addition to the mode of operation achieved by the arrangement of the one-way valves, undesired mixing of the individual components is prevented for spatial reasons alone.

Vorzugsweise weist das weitere Einwegventil einen vom Druck der durch die zweite Austrittsöffnung strömenden Komponente axial stauchbaren Faltenbalg auf. Ein solcher Faltenbalg wirkt im Sinne eines elastisch verformbaren Teiles analog der Schilderung im Zusammenhang mit dem ersten Einwegventil, nur mit dem Unterschied, dass der elastische Faltenbalg axial und die elastische Hülle radial verformbar sind. Aufgrund der Eigenspannung deckt der Faltenbalg die zweite Austrittsöffnung ab, bis eine Stauchung durch den Druck der durch die Austrittsöffnung ausströmenden Komponente erfolgt.The further one-way valve preferably has a bellows that is axially compressible by the pressure of the component flowing through the second outlet opening. Such a bellows acts in the sense of an elastically deformable part analogous to the description in connection with the first one-way valve, only with the difference that the elastic bellows are axially deformable and the elastic sleeve is radially deformable. Due to the internal stress, the bellows covers the second outlet opening until compression occurs due to the pressure of the component flowing out through the outlet opening.

Mit Vorteil wird sowohl bei Anordnung nur eines Einwegventiles, als auch bei Anordnung zweier Einwegventile, das Mischrohr derart lang ausgebildet, dass das bzw. die Einwegventile ausreichend vom Mischrohr überstanden werden. Dadurch kommt eine ausreichend lange Mischungsstrecke zustande, welche Gewähr für eine ausreichende Durchmischung der einzelnen Komponenten bietet.With the arrangement of only one one-way valve as well as with the arrangement of two one-way valves, the mixing tube is advantageously made so long that the one-way valve or valves are sufficiently protruded from the mixing tube. This creates a sufficiently long mixing section, which guarantees sufficient mixing of the individual components.

Das erfindungsgemässe Mundstück findet vorteilhaft Anwendung im Zusammenhang mit einem Auspressgerät, das eine in das Mischrohr mündende erste Austrittsöffnung und zu dieser ersten Austrittsöffnung koaxial in Auspressrichtung vorgelagert eine in das Rohrstück mündende zweite Austrittsöffnung aufweist. Ein Gerät dieser Bauart kann beispielsweise so ausgelegt sein, dass die in das Mischrohr mündende Austrittsöffnung der Abgabe von Prepolymer oder ähnlicher Harze dient und die koaxial dazu angeordnete, in das Rohrstück mündende Austrittsöffnung für die Abgabe eines Aktivators vorgesehen ist.The mouthpiece according to the invention is advantageously used in connection with an extrusion device which has a first outlet opening opening into the mixing tube and, upstream of this first outlet opening, coaxially in front of this first outlet opening and a second outlet opening opening into the tube section. A device of this type can, for example, be designed in such a way that the outlet opening opening into the mixing tube is used for the delivery of prepolymer or similar resins and the outlet opening opening coaxially therewith is provided for the delivery of an activator.

Die Erfindung wird nachstehend, anhand der sie beispielsweise wiedergebenden Zeichnungen, näher erläutert. Es zeigen:

Fig. 1
ein Mundstück mit einem Einwegventil im Längsschnitt und schematisch angedeutetem Vorderteil eines Auspressgerätes;
Fig. 2
ein zweites Einwegventil für die zweite Komponente aus dem Auspressgerät.
The invention is explained in more detail below with reference to the drawings, for example. Show it:
Fig. 1
a mouthpiece with a one-way valve in longitudinal section and schematically indicated front part of a dispenser;
Fig. 2
a second one-way valve for the second component from the dispenser.

Wie Fig. 1 zeigt, besteht das Mundstück im wesentlichen aus einem Mischrohr 1 und einem Rohrstück 2. Angeschlossen ist das Mundstück an ein Auspressgerät, dessen Vorderteil 3 strichpunktiert angedeutet ist. Andeutungsweise ist dem Vorderteil 3 eine erste - in geschlossener Stellung dargestellte - Austrittsöffnung 3a und zu dieser ersten Austrittsöffnung 3a koaxial in Auspressrichtung vorgelagert eine zweite Austrittsöffnung 3b zugeordnet. Dabei mündet die erste Austrittsöffnung 3a in das Auspressrohr 1 und die zweite Austrittsöffnung 3b in das Rohrstück 2.As shown in FIG. 1, the mouthpiece consists essentially of a mixing tube 1 and a tube piece 2. The mouthpiece is connected to an extrusion device, the front part 3 of which is indicated by dash-dotted lines. The front part 3 is indicated by a first outlet opening 3a (shown in the closed position) and a second outlet opening 3b upstream of this first outlet opening 3a coaxially in the squeezing direction. The first outlet opening 3a opens into the squeezing tube 1 and the second outlet opening 3b opens into the pipe section 2.

Wie die Zeichnung ferner zeigt, ist das Rohrstück 2 über Rippen 4 im Mischrohr 1 gehaltert und stabilisiert. Ferner wird gezeigt, wie das Rohrstück 2 mit einer sich in Auspressrichtung leicht verjüngenden Bohrung 2a versehen ist, welche an ihrem in Auspressrichtung weisenden Ende in radiale Durchtritte 2b mündet. Diese sich im Mündungsbereich des Rohrstückes 2 befindlichen Durchtritte 2b sind von einer elastischen Hülle 5 umgeben. Diese elastische Hülle 5 ist an ihrem zur Mündung des Mischrohres 1 weisenden Endbereich mit dem Rohrstück 2 verbunden, dh dieser Endbereich ist beispielsweise von Vorsprüngen 2c des Rohrstückes 2 umstanden. In den von den Vorsprüngen 2c gebildeten Raum kann die Hülle 5 eingeklemmt und gegebenenfalls zusätzlich noch verklebt werden. An ihrem gegenüberliegenden Endbereich ist die Hülle 5 vom Druck der durch das Rohrstück 2 strömenden Komponente radial dehnbar, so dass in diesem Bereich die durch die Durchtritte 2b austretende Komponente nach Ausdehnung der Hülle 5 ins Mischrohr 1 gelangen kann und sich dort mit der anderen Komponente vermischt. Das dem Auspressgerät zugewandte Ende des Mischrohres 1, kann zudem mit einer oder mehreren über die rückwärtige Stirnseite verteilten Ausnehmungen, beispielsweise in Form von Kerben 1a, versehen sein, so dass sich an der rückwärtigen Stirnseite des Mischrohres 1 Kanten bilden. Diese Kanten können zum Reinigen des jeweiligen Bereiches des Auspressgerätes herangezogen werden, indem das Mischrohr 1 um seine eigene Achse gedreht wird, um so Reste der einzelnen Komponenten entfernen zu können.As the drawing also shows, the pipe section 2 is held and stabilized via ribs 4 in the mixing pipe 1. It is also shown how the pipe section 2 is provided with a bore 2a which tapers slightly in the pressing-out direction and which opens into radial passages 2b at its end pointing in the pressing-out direction. These passages 2b located in the mouth region of the pipe section 2 are surrounded by an elastic sheath 5. This elastic sleeve 5 is connected to the pipe section 2 at its end area facing the mouth of the mixing pipe 1, ie this end area is surrounded, for example, by projections 2c of the pipe section 2. The casing 5 can be clamped into the space formed by the projections 2c and, if necessary, additionally glued. The envelope 5 is at its opposite end region radially expandable from the pressure of the component flowing through the pipe section 2, so that in this area the component emerging through the passages 2b can reach the mixing tube 1 after expansion of the casing 5 and mix there with the other component. The end of the mixing tube 1 facing the dispenser can also be provided with one or more recesses distributed over the rear end face, for example in the form of notches 1a, so that 1 edges form on the rear end face of the mixing tube. These edges can be used to clean the respective area of the squeezing device by rotating the mixing tube 1 about its own axis so that residues of the individual components can be removed.

Fig. 2 zeigt ein weiteres Einwegventil für die zweite Komponente. Das Mundstück mit seinem Mischrohr 6 ist an einem Auspressgerät, dessen Vorderteil 7 strichpunktartig angedeutet ist, angeschlossen. Andeutungsweise ist das Vorderteil 7 mit einer ersten Austrittsöffnung 7a für die erste Komponente und einer zweiten - in geöffneter Stellung dargestellten - Austrittsöffnung 7b für die zweite Komponente versehen, wobei die erste Austrittsöffnung 7a koaxial in Auspressrichtung zur Austrittsöffnung 7b vorgelagert ist.Fig. 2 shows another one-way valve for the second component. The mouthpiece with its mixing tube 6 is connected to an extrusion device, the front part 7 of which is indicated by a dot-dash line. The front part 7 is indicated with a first outlet opening 7a for the first component and a second outlet opening 7b - shown in the open position - for the second component, the first outlet opening 7a being arranged coaxially in the squeezing direction to the outlet opening 7b.

Wie die Fig. 2 ferner zeigt, mündet die erste Austrittsöffnung 7a in ein Rohrstück 8. Dieses Rohrstück 8 ist mit einer sich in Auspressichtung leicht verjüngenden Bohrung 8a versehen, welche an ihrem in Auspressrichtung weisenden Ende in radiale Durchtritte mündet. Diese sich im Mündungsbereich des Rohrstückes 8 befindlichen Durchtritte sind von einer elastischen Hülle umgeben. Im Bereich der Durchtritte ist die elastische Hülle vom Druck der durch die Bohrung strömenden Komponente radial verformbar. Gehaltert und stabilisiert ist das Rohrstück 8 über Rippen 8c, welche sich am Mischrohr 6 abstützen.As FIG. 2 also shows, the first outlet opening 7a opens into a pipe section 8. This pipe section 8 is provided with a bore 8a which tapers slightly in the direction of squeezing and which opens into radial passages at its end pointing in the direction of squeezing. These passages located in the mouth area of the pipe section 8 are surrounded by an elastic cover. In the area of the passages, the elastic sleeve can be radially deformed by the pressure of the component flowing through the bore. The pipe section 8 is held and stabilized by means of ribs 8c which are supported on the mixing pipe 6.

In dem entgegen der Auspressrichtung weisenden Bereich ist das Rohrstück 8 von einem Faltenbalg 10 umgeben. Dieser Faltenbalg 10 deckt axial die Austrittsöffnung 7b ab. Vom Druck der durch die Austrittsöffnung 7b strömenden Komponente wird der Faltenbalg 10 axial gestaucht, so dass die Komponente austreten und in Auspressrichtung entlang des Ringraumes zwischen Faltenbalg 10, Rohrstück 8 und Mischrohr 6 strömen kann. Im Bereich der Durchtritte vermischen sich die einzelnen aus den Durchtrittsöffnungen 7a, 7b strömenden Komponenten.In the area pointing counter to the pressing direction, the pipe section 8 is surrounded by a bellows 10. This bellows 10 axially covers the outlet opening 7b. The bellows 10 is axially compressed by the pressure of the component flowing through the outlet opening 7b, so that the component can emerge and flow in the pressing direction along the annular space between the bellows 10, the pipe section 8 and the mixing tube 6. In the area of the passages, the individual components flowing out of the passage openings 7a, 7b mix.

Für das Mischrohr 1, 6 sowie das Rohrstück 2, 8 bietet sich als Material Kunststoff an. Ebenfalls aus Kunststoff, aber aus stark elastischem, ist mit Vorteil die Hülle 5 sowie der Faltenbalg 10 gebildet.Plastic is a suitable material for the mixing pipe 1, 6 and the pipe section 2, 8. The sleeve 5 and the bellows 10 are also advantageously formed from plastic, but from a highly elastic one.

Claims (10)

  1. Mouthpiece for squeezing-out devices used to dispense two-component masses, having a mixing tube (1, 6) constructed for connection to an appliance-side dispensing nozzle (3, 7) with two outlet openings (3a, 3d; 7a, 7b) for the individual components, and having a tube section (2, 8) which opens out inside the mixing tube (1, 6) and around which one of the components flows during operation, and the mouth region of which incorporates a unidirectional valve (2b, 5) for passage of the second component into the flow of the first component, characterised in that the outlet of the unidirectional valve (2b, 5) is so disposed that the direction in which the second component is discharged is counter to the direction of flow of the first component.
  2. Mouthpiece according to claim 1, characterised in that the tube section (2, 8) is mounted coaxially in the mixing tube (1, 6) and is adapted to be connected jointly with the mixing tube (1, 6) to the appliance-side dispensing nozzle (3, 7), with the result that a first outlet opening (3a, 7b) communicates with the mixing tube (1, 6) and the second outlet opening (3b, 7a) of the dispensing nozzle (3, 7) communicates with the tube section (2, 8), the said second outlet opening preferably being set coaxially ahead of the first outlet opening (3a, 7b).
  3. Mouthpiece according to claim 2, characterised in that the unidirectional valve incorporates one or more openings adapted to be obturated by an elastically deformable part.
  4. Mouthpiece according to claim 3, characterised in that the openings are in the form of radial passages (2b) in the mouth region of the tube section (2).
  5. Mouthpiece according to claim 3 or 4, characterised in that the elastically deformable part is constituted by a flexible sheath (5) which surrounds the openings.
  6. Mouthpiece according to claim 5, characterised in that at its end region facing the mouth of the mixing tube (1) the flexible sheath (5) is joined to the mouth region of the tube section (2) and at its opposite end region it is adapted to be elastically deformed by the pressure of the component flowing through the tube section (2).
  7. Mouthpiece according to any of claims 1 to 6, characterised in that an additional unidirectional valve is disposed in the region of the point of connection to a second outlet opening (7b).
  8. Mouthpiece according to claim 7, characterised in that the additional unidirectional valve incorporates a bellows (10) which is adapted to be axially compressed by the pressure of the component flowing through the second outlet opening (7b).
  9. Mouthpiece according to any of claims 1 to 8, characterised in that the mouth of the mixing tube (1) projects axially past the unidirectional valves in the squeezing-out direction.
  10. Mouthpiece according to any of claims 1 to 9, characterised by being constructed as a disposable part which after the operation of squeezing out the two-component mass has been interrupted for some time can be removed from the squeezing-out device and upon resumption of the squeezing-out operation can be replaced by a new identical mouthpiece.
EP93810389A 1992-07-24 1993-05-28 Mouthpiece for squeezing out devices for two component masses Expired - Lifetime EP0580547B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4224497 1992-07-24
DE4224497A DE4224497A1 (en) 1992-07-24 1992-07-24 Mouthpiece for dispensing devices that are used to dispense two-component materials

Publications (2)

Publication Number Publication Date
EP0580547A1 EP0580547A1 (en) 1994-01-26
EP0580547B1 true EP0580547B1 (en) 1996-06-19

Family

ID=6464022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93810389A Expired - Lifetime EP0580547B1 (en) 1992-07-24 1993-05-28 Mouthpiece for squeezing out devices for two component masses

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US (1) US5429277A (en)
EP (1) EP0580547B1 (en)
JP (1) JPH06154685A (en)
AT (1) ATE139462T1 (en)
CA (1) CA2101149C (en)
DE (2) DE4224497A1 (en)
DK (1) DK0580547T3 (en)
ES (1) ES2088259T3 (en)

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Publication number Priority date Publication date Assignee Title
DE69626297T2 (en) * 1995-09-25 2003-12-11 Robert Eric Montgomery TOOTH WHITENING COMPOSITIONS
GB9711719D0 (en) * 1997-06-06 1997-08-06 Valsave Engineering Services L Fluid mixing
EP2258468B1 (en) * 2009-06-05 2012-05-16 Ritter GmbH Mixing system for dual component cartridges
EP2563524B1 (en) * 2010-04-28 2020-10-07 IPS Adhesives LLC Apparatus for mixing and dispensing multiple flowable components
DE102011076443B4 (en) 2011-05-25 2013-01-17 Lechler Gmbh Check valve for spray nozzle and nozzle tube
EP3023204A1 (en) * 2014-11-21 2016-05-25 HILTI Aktiengesellschaft Handheld tool gear closure and handheld machine tool
EP3630364B1 (en) * 2017-05-25 2023-04-05 GCP Applied Technologies Inc. Expanding nozzle for component additions in a concrete truck, and method and system for use of same
DE102020103073B4 (en) 2020-02-06 2021-12-30 Frank Wolff Mixing device for two-component adhesives

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US384306A (en) * 1888-06-12 Francois febnand bouedil
US1445826A (en) * 1923-02-20 Milton a
US1164350A (en) * 1914-10-08 1915-12-14 Jacob Fridrich Huber Dispensing apparatus.
US2503534A (en) * 1944-08-21 1950-04-11 Rover Co Ltd Liquid fuel injection means for internal-combustion engines
FR953482A (en) * 1947-09-25 1949-12-07 Spring device for spraying and mixing fluids
US3015420A (en) * 1960-07-25 1962-01-02 Morris H Chudnow Double stroke variable control fluid dispensing valve
GB1003320A (en) * 1961-10-25 1965-09-02 Samuel Jones & Co Engineering Improvements in fire extinguisher discharge nozzles
DE1454790A1 (en) * 1963-11-05 1969-06-12 Bayer Ag Mixing device for the production of plastics
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DE2339927A1 (en) * 1973-08-07 1975-02-20 Peter Christiansen Crude water treatment plant aerator - has perforated elastomer shell around perforated thermoplastics cylinder for compressed air inlet
US3908868A (en) * 1974-05-31 1975-09-30 Itt Liquid dispenser
GB2029716A (en) * 1978-09-04 1980-03-26 Crosby & Co Ltd Mixing reactive components in flow
JPS60168625A (en) * 1984-02-13 1985-09-02 Ekuseru Kk Manufacture of hollow molded article provided with composite material and manufacturing device thereof
CH670580A5 (en) * 1987-04-16 1989-06-30 Ehrensperger C Ag
DE3802519C2 (en) * 1988-01-28 1994-10-06 Ladoco Ag Device for the metered delivery of liquid or flowable material components which react chemically with one another to form a non-flowable mass
DE8900469U1 (en) * 1989-01-17 1990-05-23 Espe Stiftung & Co Produktions- Und Vertriebs Kg, 8031 Seefeld, De
GB2256636A (en) * 1991-06-11 1992-12-16 Imi Cornelius Beverage dispense nozzle

Also Published As

Publication number Publication date
EP0580547A1 (en) 1994-01-26
US5429277A (en) 1995-07-04
JPH06154685A (en) 1994-06-03
CA2101149C (en) 2000-10-10
CA2101149A1 (en) 1994-01-25
DE59302992D1 (en) 1996-07-25
ATE139462T1 (en) 1996-07-15
DK0580547T3 (en) 1996-11-04
ES2088259T3 (en) 1996-08-01
DE4224497A1 (en) 1994-01-27

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