EP0581123B1 - Process for the oxygen-free packaging of goods - Google Patents

Process for the oxygen-free packaging of goods Download PDF

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Publication number
EP0581123B1
EP0581123B1 EP93111311A EP93111311A EP0581123B1 EP 0581123 B1 EP0581123 B1 EP 0581123B1 EP 93111311 A EP93111311 A EP 93111311A EP 93111311 A EP93111311 A EP 93111311A EP 0581123 B1 EP0581123 B1 EP 0581123B1
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EP
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Prior art keywords
container
gas
interior
border
oxygen
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EP93111311A
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German (de)
French (fr)
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EP0581123A1 (en
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Franz Dipl.-Ing. Garnreiter (Fh)
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Linde GmbH
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Linde GmbH
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/04Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied
    • B65B31/043Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied the nozzles acting horizontally between an upper and a lower part of the container or wrapper, e.g. between container and lid

Definitions

  • the invention relates to a method for oxygen-free packaging of goods in an open-topped container with a container edge which delimits the container at the top and a container bottom which delimits the container and which is raised in one or more areas of the container interior encompassed by the container edge up to the height of the container edge , the goods being filled into the container and the air inside the container being replaced by an inert gas which is inflated from below onto the cover by at least one passage opening provided in the region of the container bottom which is raised to the height of the container edge, through the cover in deflected in the horizontal direction, transferred radially into the interior of the container and discharged from the interior of the container through a gap formed by the edge of the container and the cover, and after the air had been replaced, the cover was attached to the edge of the container in a gas-tight manner and the Ve connection between the passage opening and the container interior is broken.
  • a packaging method is known from AT-B 347 352, in which the package is evacuated before closing.
  • the level of the vacuum must be limited so that the boiling point of the goods to be packaged is not reached.
  • a control device is therefore proposed which determines the size of the vacuum individually for each pack from the temperature of the goods in accordance with the associated vapor pressure curve.
  • a further development of the method mentioned is to replace the air inside the container with inert gas before or during the evacuation of the container. This means that a lower vacuum is sufficient for perfect packaging than without gas exchange.
  • a gas is blown into the partially sealed package from the unsealed side, the package is flushed with the gas, the gas is withdrawn on the unsealed side, and the package is finally completely sealed.
  • this method does not guarantee that the contents of the package are flushed completely free of oxygen, since on the end of the package facing away from the unsealed side of the filled one Under certain circumstances, goods-covered areas cannot be sufficiently covered by the purge gas.
  • this method is unsuitable for washing multi-compartment menu trays, since each of the compartment volumes would have to be washed separately, which would require considerable effort.
  • the object of the present invention is to design a method of the type mentioned at the outset in such a way that oxygen-free packaging of goods takes place in a simple and economical manner without the disadvantages of the previous methods mentioned.
  • This object is achieved in that the gas is released directly into the atmosphere and that the outflow cross sections for the gas are so small that sufficient gas pressure is created in the interior of the container to displace the air from the entire interior of the container without the need for evacuation devices are.
  • the raised region of the container base with the passage opening for the gas is preferably on the imaginary axis.
  • the passage opening is expediently arranged at the imaginary intersection of the diagonals. Since the cover is held only a short distance, preferably 1 to 30 mm, above the edge of the container, it is ensured that due to the associated small outflow cross-sections for the gas from the container, sufficient gas pressure can be produced in the container to remove the air from the to displace entire container volume. By setting a small distance between the cover and the raised area of the container bottom it is achieved that the blown-in gas is immediately deflected in the horizontal direction and transferred radially evenly distributed into the container interior.
  • the invention is particularly suitable for the oxygen-free packaging of multi-compartment menu trays, in which the individual compartments are separated from one another by compartment dividers which converge in a central container area.
  • the gas passage opening is arranged in the area where the compartment partition walls converge. In this way it is achieved that the individual compartment volumes can be flushed uniformly with the gas from one point.
  • a sealing surface is usually applied to the edge of the container, on which the cover is attached.
  • the raised area of the container base is preferably delimited in the radial direction by a sealing surface so that the cover can be attached to the outer edge of the raised area of the container base. The entire interior of the container is thus sealed gas-tight both towards the edge of the container and towards the passage opening in the bottom of the container.
  • an inert gas in particular gaseous nitrogen, or a mixed gas, in particular an N 2 / CO 2 mixed gas or an N 2 / CO 2 / O 2 mixed gas with possible proportions of argon, helium or carbon monoxide, is expediently used used.
  • the gaseous nitrogen displaces the oxygen from the container and creates an inert atmosphere inside the container, which increases the shelf life of the food.
  • the invention enables a uniform gas purging of the container from one place.
  • oxygen-free packaging of product in containers is achieved without expensive equipment, such as e.g. Vacuum pumps and vacuum chambers would be required.
  • the process according to the invention creates an oxygen-free atmosphere in the containers within a short time, which also ensures packaging and storage of oxygen-sensitive products. In this way e.g. Foods are permanently protected from oxidation processes so that their shelf life is improved.
  • the invention is particularly suitable for packaging finished food products in single or multi-compartment menu trays.
  • FIG. 1 shows a container 6 designed as a menu shell, as used, for example, for packaging finished food products.
  • the menu tray 6 has a container base 12 which is raised in the middle of the menu tray 6 to the height of the container edge 10 and forms an area 8.
  • a gas passage opening 9 is arranged in this area 8.
  • the passage opening 9 is connected to a gas supply line 3 via which gaseous nitrogen is supplied to the gas passage opening and is inflated onto the cover 2 from below.
  • the gas flow is deflected in the horizontal direction by the cover 2 and is distributed to the interior of the container in a radially uniform manner.
  • the cover 2 is held at a small distance, preferably 1 to 30 mm, over the area 8 and the container edge 10.
  • the area 5 of the container interior is covered by the filled goods, e.g. a finished food product, filled out.
  • the area 4 lying above is usually referred to as the container head space.
  • the entire container interior 4, 5 can be flushed oxygen-free from a central point. Not only is the air from the container head space 4 but also from the spaces formed by the goods in the area 5 flushed oxygen-free.
  • the path of the nitrogen gas is shown in the figure with arrows. After purging the container interior 4, 5, the nitrogen gas is released into the atmosphere via the gap formed by the container edge 10 and the cover 2.
  • the cover is lowered by means of the sealing device 1 on the container edge 10 and the area 8 of the container base 12.
  • the menu tray 6 is sealed gas-tight by means of sealing surfaces which are applied to the container edge 10 and the area 8. Therefore, atmospheric oxygen can no longer get into the container interior 4, 5 via the gas passage opening 9.
  • FIG. 2 shows a top view of a multi-compartment menu tray, the compartment dividing walls 11 converging in a central region 8 of the menu tray.
  • the container base is pulled upwards and forms a small cup open at the top with a cup rim on which a sealing surface 7 is applied.
  • the nitrogen gas is blown into the cup from below and, over the rim of the cup, passes into the individual compartment volumes of the menu bowl in a radially even distribution.
  • the nitrogen gas displaces the atmospheric oxygen from the fan volumes and is released into the atmosphere via the container rim 10. In this way, the entire container volume can be flushed completely oxygen-free from a fumigation point.
  • the path of the nitrogen gas is again shown in the figure by arrows.
  • the cover rests on the sealing surfaces 7 of the raised region 8 and the container rim 10. After the menu tray has been sealed, atmospheric oxygen can no longer get into the menu tray via the gas passage opening in the raised area 8, since the gas passage opening is closed by the cover.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vacuum Packaging (AREA)

Description

Die Erfindung betrifft ein Verfahren zum sauerstofffreien Verpacken von Ware in einen oben offenen Behälter mit einem den Behälter nach oben begrenzenden Behälterrand und einem den Behälter nach unten begrenzenden Behälterboden, der in einem oder mehreren Bereichen des vom Behälterrand umfaßten Behälterinnenraumes bis zur Höhe des Behälterrandes hochgezogen ist, wobei die Ware in den Behälter eingefüllt wird und die im Behälterinnenraum befindliche Luft durch ein inertes Gas ersetzt wird, das durch mindestens eine in dem bis zur Höhe des Behälterrandes hochgezogenen Bereich des Behälterbodens vorgesehene Durchtrittsöffnung von unten auf die Abdeckung aufgeblasen, durch die Abdeckung in horizontale Richtung umgelenkt, radial in den Behälterinnenraum überführt und durch einen von dem Behälterrand und der Abdeckung gebildeten Spalt aus dem Behälterinneren abgeführt wird, und nach dem Ersetzen der Luft die Abdeckung auf dem Behälterrand gasdicht befestigt und die Verbindung zwischen der Durchtrittsöffnung und dem Behälterinnenraum unterbrochen wird.The invention relates to a method for oxygen-free packaging of goods in an open-topped container with a container edge which delimits the container at the top and a container bottom which delimits the container and which is raised in one or more areas of the container interior encompassed by the container edge up to the height of the container edge , the goods being filled into the container and the air inside the container being replaced by an inert gas which is inflated from below onto the cover by at least one passage opening provided in the region of the container bottom which is raised to the height of the container edge, through the cover in deflected in the horizontal direction, transferred radially into the interior of the container and discharged from the interior of the container through a gap formed by the edge of the container and the cover, and after the air had been replaced, the cover was attached to the edge of the container in a gas-tight manner and the Ve connection between the passage opening and the container interior is broken.

Bei einigen Waren, insbesondere Lebensmittelprodukten, ist es vorteilhaft, sie unter Ausschluß von Sauerstoff aufzubewahren, um z.B. deren Qualität und Haltbarkeit sicherzustellen. Es sind verschiedene Verfahren bekannt, um innerhalb einer Packung eine sauerstofffreie Atmosphäre zu schaffen.For some goods, especially food products, it is advantageous to store them in the absence of oxygen, e.g. ensure their quality and durability. Various methods are known for creating an oxygen-free atmosphere within a package.

Aus AT-B 347 352 ist eine Verpackungsmethode bekannt, bei der die Packung vor dem Verschließen evakuiert wird. Um ein Versprühen der verpackten Ware beim Evakuieren zu vermeiden, muß die Höhe des Vakuums so begrenzt werden, daß der Siedepunkt des zu verpackenden Gutes nicht erreicht wird. Gemäß dieser Schrift wird daher eine Regelvorrichtung vorgeschlagen, die individuell für jede Packung aus der Temperatur der Ware entsprechend der zugehörigen Dampfdruckkurve die Größe des Vakuums bestimmt.A packaging method is known from AT-B 347 352, in which the package is evacuated before closing. In order to avoid spraying the packaged goods during evacuation, the level of the vacuum must be limited so that the boiling point of the goods to be packaged is not reached. According to this document, a control device is therefore proposed which determines the size of the vacuum individually for each pack from the temperature of the goods in accordance with the associated vapor pressure curve.

Diese Methode ist mit einem enormen apparativen Aufwand verbunden. Es sind aufwendige Vakuumkammern und mindestens eine leistungsfähige Vakuumpumpe, sowie ein Regelkreis mit entsprechenden Vergleichs- und Stellgliedern erforderlich.This method is associated with an enormous expenditure on equipment. Complex vacuum chambers and at least one powerful vacuum pump, as well as a control loop with corresponding comparison and actuators are required.

Überdies ergeben sich Probleme bei Produkten mit niedrig siedenden Aromastoffen, wie z.B. Kaffee, da diese dann aufgrund des Vakuums dem Produkt verlorengehen.In addition, there are problems with products with low-boiling flavors, such as Coffee, as these are then lost to the product due to the vacuum.

Eine Weiterentwicklung der genannten Methode besteht darin, vor oder während des Evakuierens des Behälters die Luft im Behälterinneren mit inertem Gas zu ersetzen. Dadurch genügt zum einwandfreien Verpacken ein geringeres Vakuum als ohne Gasaustausch.A further development of the method mentioned is to replace the air inside the container with inert gas before or during the evacuation of the container. This means that a lower vacuum is sufficient for perfect packaging than without gas exchange.

Es ist auch bekannt, eine sauerstofffreie Atmosphäre innerhalb der Packung durch Sauerstoffbindung in der Packung mit Chemikalien zu erreichen. Diese Methode ist jedoch bei Lebensmittelpackungen z.B. aufgrund unsachgemäßer Verwendungsmöglichkeiten der Chemikalien durch Kinder bedenklich.It is also known to achieve an oxygen-free atmosphere within the package by binding oxygen in the package with chemicals. However, this method is used for food packaging e.g. due to improper use of the chemicals by children.

Schließlich ist es aus der DE-OS 36 25 081 bekannt, zum Kopfraumspülen von Behältnissen gasförmigen Stickstoff zu verwenden, der aus eindosiertem flüssigem Stickstoff durch Verdampfen entsteht. Wird dieses Verfahren beim Verpacken von mehrfächrigen Menüschalen eingesetzt, wie sie bei Lebensmittelfertigprodukten verwendet werden, so müssen bei unterschiedlichen Fächervolumina in die Fächer unterschiedliche Flüssigstickstoffmengen eindosiert werden, damit entsprechend der zu verdrängenden Luftmenge ausreichend gasförmiger Stickstoff zur Verfügung steht. Dies erfordert eine aufwendige Flüssigstickstoffdosieranlage mit mehreren Dosierstellen. Außerdem sammelt sich der flüssige Stickstoff erfahrungsgemäß nicht in der dosierten Menge an einem bevorzugten Ort in der Schale, sondern verteilt sich an beliebiger Stelle zu ungleichmäßigen Mengen. Dies bringt erheblich schwankende Verdampfungszeiten für den flüssigen Stickstoff mit sich. Aus diesem Grund muß mit dem Verschließen der Schalen gewartet werden, bis zumindest in 99 von 100 Schalen der flüssige Stickstoff vollständig verdampft ist. Andernfalls würden Reste an flüssigem Stickstoff in der verschlossenen Schale nach Verdampfen zu einem Überdruck in der Schale führen, der geringstenfalls ein unerwünschtes Aufwölben des Deckels oder sogar ein Aufplatzen der Verpackung zur Folge hat.Finally, it is known from DE-OS 36 25 081 to use gaseous nitrogen for flushing the headspace of containers, which is produced by evaporation from metered liquid nitrogen. If this process is used for packaging multi-compartment menu trays, such as those used in finished food products, different amounts of liquid nitrogen must be metered into the compartments for different compartment volumes so that sufficient gaseous nitrogen is available according to the amount of air to be displaced. This requires a complex liquid nitrogen metering system with several metering points. In addition, experience has shown that the liquid nitrogen does not collect in the dosed amount at a preferred location in the shell, but rather distributes itself at random to uneven amounts. This entails considerably fluctuating evaporation times for the liquid nitrogen. For this reason, it is necessary to wait until the trays have been closed until the liquid nitrogen has completely evaporated in at least 99 out of 100 trays. Otherwise, residues of liquid nitrogen in the sealed shell would lead to excess pressure in the shell after evaporation, which would at the least result in undesired bulging of the lid or even bursting of the packaging.

Gemäß dieser Druckschrift ist darüber hinaus vorgesehen, daß in die teilversiegelte Packung von der unversiegelten Seite her ein Gas eingeblasen wird, die Packung mit dem Gas gespült wird, das Gas auf der unversiegelten Seite wieder abgezogen wird und die Packung schließlich ganz versiegelt wird. Mit dieser Methode ist jedoch nicht gewährleistet, daß der Packungsinhalt vollständig sauerstofffrei gespült wird, da auf dem der unversiegelten Seite abgewandten Ende der Packung von der eingefüllten Ware verdeckte Bereiche unter Umständen nicht ausreichend von dem Spülgas erfaßt werden können. Außerdem ist diese Methode für das Spülen von mehrfächrigen Menüschalen ungeeignet, da jedes der Fächervolumina separat gespült werden müßte, was einen erheblichen Aufwand erfordern würde.According to this document, it is also provided that a gas is blown into the partially sealed package from the unsealed side, the package is flushed with the gas, the gas is withdrawn on the unsealed side, and the package is finally completely sealed. However, this method does not guarantee that the contents of the package are flushed completely free of oxygen, since on the end of the package facing away from the unsealed side of the filled one Under certain circumstances, goods-covered areas cannot be sufficiently covered by the purge gas. In addition, this method is unsuitable for washing multi-compartment menu trays, since each of the compartment volumes would have to be washed separately, which would require considerable effort.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren der eingangs genannten Art so auszugestalten, daß eine sauerstofffreie Verpackung von Waren auf einfache und wirtschaftliche Weise erfolgt, ohne daß die genannten Nachteile der bisherigen Verfahren auftreten.The object of the present invention is to design a method of the type mentioned at the outset in such a way that oxygen-free packaging of goods takes place in a simple and economical manner without the disadvantages of the previous methods mentioned.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Gas unmittelbar an die Atmosphäre abgegeben wird, und daß die Ausströmungsquerschnitte für das Gas so gering sind, daß im Behälterinnenraum ein ausreichender Gasdruck entsteht, um die Luft aus dem gesamten Behälterinnenraum zu verdrängen, ohne daß Evakuiereinrichtungen erforderlich sind.This object is achieved in that the gas is released directly into the atmosphere and that the outflow cross sections for the gas are so small that sufficient gas pressure is created in the interior of the container to displace the air from the entire interior of the container without the need for evacuation devices are.

Bei achsensymmetrischer Ausbildung des Behälters befindet sich der hochgezogene Bereich des Behälterbodens mit der Durchtrittsöffnung für das Gas bevorzugt auf der gedachten Achse. Bei rechteckigen Behältern ist die Durchtrittsöffnung zweckmäßigerweise an dem gedachten Schnittpunkt der Diagonalen angeordnet. Da die Abdeckung nur in geringem Abstand, vorzugsweise 1 bis 30 mm, über dem Behälterrand gehalten wird, ist gewährleistet, daß aufgrund der damit verbundenen geringen Ausströmungsquerschnitte für das Gas aus dem Behälter ein ausreichender Gasdruck im Behälter hergestellt werden kann, um die Luft aus dem gesamten Behältervolumen zu verdrängen. Durch Einstellung eines geringen Abstands zwischen der Abdeckung und dem hochgezogenen Bereich des Behälterbodens wird erreicht, daß das eingeblasene Gas sofort in horizontaler Richtung umgelenkt wird und radial gleichmäßig verteilt in den Behälterinnenraum überführt wird.If the container is axially symmetrical, the raised region of the container base with the passage opening for the gas is preferably on the imaginary axis. In the case of rectangular containers, the passage opening is expediently arranged at the imaginary intersection of the diagonals. Since the cover is held only a short distance, preferably 1 to 30 mm, above the edge of the container, it is ensured that due to the associated small outflow cross-sections for the gas from the container, sufficient gas pressure can be produced in the container to remove the air from the to displace entire container volume. By setting a small distance between the cover and the raised area of the container bottom it is achieved that the blown-in gas is immediately deflected in the horizontal direction and transferred radially evenly distributed into the container interior.

Die Erfindung eignet sich ganz besonders zum sauerstofffreien Verpacken von mehrfächrigen Menüschalen, bei denen die einzelnen Fächer durch Fächertrennwände, die in einem zentralen Behälterbereich zusammenlaufen, voneinander getrennt sind. Erfindungsgemäß ist die Gasdurchtrittsöffnung in diesem Fall in dem Bereich angeordnet, wo die Fächertrennwände zusammenlaufen. Auf diese Weise wird erreicht, daß die einzelnen Fächervolumina von einer Stelle aus gleichmäßig mit dem Gas gespült werden können.The invention is particularly suitable for the oxygen-free packaging of multi-compartment menu trays, in which the individual compartments are separated from one another by compartment dividers which converge in a central container area. According to the invention, in this case the gas passage opening is arranged in the area where the compartment partition walls converge. In this way it is achieved that the individual compartment volumes can be flushed uniformly with the gas from one point.

Damit der Behälter gasdicht verschlossen werden kann, ist üblicherweise auf dem Behälterrand eine Siegelfläche aufgebracht, auf der die Abdeckung befestigt wird. Außerdem wird der hochgezogene Bereich des Behälterbodens in radialer Richtung vorzugsweise durch eine Siegelfläche begrenzt, damit die Abdeckung am äußeren Rand des hochgezogenen Bereichs des Behälterbodens befestigt werden kann. Somit ist der gesamte Behälterinnenraum sowohl zum Behälterrand hin als auch zur Durchtrittsöffnung im Behälterboden hin gasdicht verschlossen.So that the container can be closed gas-tight, a sealing surface is usually applied to the edge of the container, on which the cover is attached. In addition, the raised area of the container base is preferably delimited in the radial direction by a sealing surface so that the cover can be attached to the outer edge of the raised area of the container base. The entire interior of the container is thus sealed gas-tight both towards the edge of the container and towards the passage opening in the bottom of the container.

Falls Lebensmittel verpackt werden sollen, so wird zweckmäßigerweise ein Inertgas, insbesondere gasförmiger Stickstoff, oder ein Mischgas, insbesondere ein N2/CO2-Mischgas oder ein N2/CO2/O2-Mischgas mit möglichen Anteilen von Argon, Helium oder Kohlenmonoxid eingesetzt. Der gasförmige Stickstoff verdrängt den Sauerstoff aus dem Behälter und bildet eine inerte Atmosphäre im Behälterinnenraum, wodurch die Haltbarkeit der Lebensmittel erhöht wird.If food is to be packaged, an inert gas, in particular gaseous nitrogen, or a mixed gas, in particular an N 2 / CO 2 mixed gas or an N 2 / CO 2 / O 2 mixed gas with possible proportions of argon, helium or carbon monoxide, is expediently used used. The gaseous nitrogen displaces the oxygen from the container and creates an inert atmosphere inside the container, which increases the shelf life of the food.

Die Erfindung ermöglicht eine gleichmäßige Gasspülung des Behälters von einer Stelle aus. Mit dem erfindungsgemäßen Verfahren wird ein sauerstofffreies Verpacken von Produkt in Behältern erreicht, ohne daß aufwendige Apparaturen, wie z.B. Vakuumpumpen und Vakuumkammern, erforderlich wären. Durch das erfindungsgemäße Verfahren wird innerhalb kurzer Zeit eine sauerstofffreie Atmosphäre in den Behältern geschaffen, die auch eine Verpackung und Aufbewahrung von sauerstoffempfindlichen Produkten gewährleistet. Auf diese Weise können z.B. Lebensmittel vor Oxidationsprozessen dauerhaft geschützt werden, so daß ihre Haltbarkeit verbessert wird.The invention enables a uniform gas purging of the container from one place. With the method according to the invention, oxygen-free packaging of product in containers is achieved without expensive equipment, such as e.g. Vacuum pumps and vacuum chambers would be required. The process according to the invention creates an oxygen-free atmosphere in the containers within a short time, which also ensures packaging and storage of oxygen-sensitive products. In this way e.g. Foods are permanently protected from oxidation processes so that their shelf life is improved.

Die Erfindung eignet sich vor allem zum Verpacken von Lebensmittelfertigprodukten in ein- oder mehrfächrige Menüschalen.The invention is particularly suitable for packaging finished food products in single or multi-compartment menu trays.

Im folgenden soll die Erfindung anhand eines, in den Figuren schematisch dargestellten Ausführungsbeispiels näher erläutert werden.The invention is to be explained in more detail below with the aid of an exemplary embodiment shown schematically in the figures.

Es zeigen:

Figur 1:
einen Querschnitt durch eine Menüschale mit zugeordneter Siegelvorrichtung
Figur 2:
eine Draufsicht auf eine mehrfächrige Menüschale.
Show it:
Figure 1:
a cross section through a menu tray with an associated sealing device
Figure 2:
a plan view of a multi-compartment menu bowl.

In Figur 1 ist ein als Menüschale ausgebildeter Behälter 6 dargestellt, wie er beispielsweise zum Verpacken von Lebensmittelfertigprodukten verwendet wird. Die Menüschale 6 weist einen Behälterboden 12 auf, der in der Mitte der Menüschale 6 bis zur Höhe des Behälterrandes 10 hochgezogen ist und einen Bereich 8 bildet. Erfindungsgemäß ist in diesem Bereich 8 eine Gasdurchtrittsöffnung 9 angeordnet. Die Durchtrittsöffnung 9 steht mit einer Gaszufuhrleitung 3 in Verbindung, über die gasförmiger Stickstoff der Gasdurchtrittsöffnung zugeführt und von unten auf die Abdeckung 2 aufgeblasen wird. Der Gasstrom wird durch die Abdeckung 2 in horizontale Richtung umgelenkt und radial gleichmäßig verteilt an den Behälterinnenraum abgegeben. Die Abdeckung 2 wird in geringem Abstand, vorzugsweise 1 bis 30 mm, über dem Bereich 8 und dem Behälterrand 10 gehalten.FIG. 1 shows a container 6 designed as a menu shell, as used, for example, for packaging finished food products. The menu tray 6 has a container base 12 which is raised in the middle of the menu tray 6 to the height of the container edge 10 and forms an area 8. According to the invention, a gas passage opening 9 is arranged in this area 8. The passage opening 9 is connected to a gas supply line 3 via which gaseous nitrogen is supplied to the gas passage opening and is inflated onto the cover 2 from below. The gas flow is deflected in the horizontal direction by the cover 2 and is distributed to the interior of the container in a radially uniform manner. The cover 2 is held at a small distance, preferably 1 to 30 mm, over the area 8 and the container edge 10.

Der Bereich 5 des Behälterinnenraums wird durch die eingefüllte Ware, z.B. ein Lebensmittelfertigprodukt, ausgefüllt. Der darüber liegende Bereich 4 wird üblicherweise als Behälterkopfraum bezeichnet. Mit der erfindungsgemäßen Vorrichtung kann der gesamte Behälterinnenraum 4, 5 von einer zentralen Stelle aus sauerstofffrei gespült werden. Dabei wird nicht nur die Luft aus dem Behälterkopfraum 4 sondern auch aus den von der Ware im Bereich 5 gebildeten Zwischenräumen sauerstofffrei gespült.The area 5 of the container interior is covered by the filled goods, e.g. a finished food product, filled out. The area 4 lying above is usually referred to as the container head space. With the device according to the invention, the entire container interior 4, 5 can be flushed oxygen-free from a central point. Not only is the air from the container head space 4 but also from the spaces formed by the goods in the area 5 flushed oxygen-free.

Der Weg des Stickstoffgases ist in der Figur mit Pfeilen verdeutlicht. Nach dem Spülen des Behälterinnenraumes 4, 5 wird das Stickstoffgas über den vom Behälterrand 10 und der Abdeckung 2 gebildeten Spalt an die Atmosphäre abgegeben.The path of the nitrogen gas is shown in the figure with arrows. After purging the container interior 4, 5, the nitrogen gas is released into the atmosphere via the gap formed by the container edge 10 and the cover 2.

Ist die Menüschale 6 vollständig mit dem Stickstoffgas sauerstofffrei gespült, so wird die Abdeckung mittels der Siegelvorrichtung 1 auf dem Behälterrand 10 und den Bereich 8 des Behälterbodens 12 abgesenkt. Die Menüschale 6 wird mittels Siegelflächen, die auf den Behälterrand 10 und den Bereich 8 aufgetragen sind, gasdicht versiegelt. Deshalb kann auch über die Gasdurchtrittsöffnung 9 kein Luftsauerstoff mehr in den Behälterinnenraum 4, 5 gelangen.If the menu tray 6 is flushed completely with the nitrogen gas free of oxygen, the cover is lowered by means of the sealing device 1 on the container edge 10 and the area 8 of the container base 12. The menu tray 6 is sealed gas-tight by means of sealing surfaces which are applied to the container edge 10 and the area 8. Therefore, atmospheric oxygen can no longer get into the container interior 4, 5 via the gas passage opening 9.

Figur 2 zeigt eine Draufsicht auf eine mehrfächrige Menüschale, wobei die Fächertrennwände 11 in einem zentral gelegenen Bereich 8 der Menüschale zusammenlaufen. Im Bereich 8 ist der Behälterboden nach oben gezogen und bildet einen kleinen nach oben offenen Becher mit einem Becherrand, auf den eine Siegelfläche 7 aufgetragen ist. Das Stickstoffgas wird von unten in den Becher eingeblasen und tritt über den Becherrand radial gleichmäßig verteilt in die einzelnen Fächervolumina der Menüschale über. Das Stickstoffgas verdrängt den Luftsauerstoff aus den Fächervolumina und wird über den Behälterrand 10 an die Atmosphäre abgegeben. Auf diese Weise kann das gesamte Behältervolumen von einer Begasungsstelle aus vollständig sauerstofffrei gespült werden. Der Weg des Stickstoffgases ist in der Figur wieder durch Pfeile verdeutlicht.FIG. 2 shows a top view of a multi-compartment menu tray, the compartment dividing walls 11 converging in a central region 8 of the menu tray. In area 8, the container base is pulled upwards and forms a small cup open at the top with a cup rim on which a sealing surface 7 is applied. The nitrogen gas is blown into the cup from below and, over the rim of the cup, passes into the individual compartment volumes of the menu bowl in a radially even distribution. The nitrogen gas displaces the atmospheric oxygen from the fan volumes and is released into the atmosphere via the container rim 10. In this way, the entire container volume can be flushed completely oxygen-free from a fumigation point. The path of the nitrogen gas is again shown in the figure by arrows.

Nach dem Verschließen der Menüschale liegt die in der Figur nicht dargestellte Abdeckung auf den Siegelflächen 7 des hochgezogenen Bereichs 8 und des Behälterrandes 10 auf. Nach dem Versiegeln der Menüschale kann auch über die Gasdurchtrittsöffnung in dem hochgezogenen Bereich 8 kein Luftsauerstoff mehr in die Menüschale gelangen, da die Gasdurchtrittsöffnung durch die Abdeckung verschlossen ist.After the menu tray has been closed, the cover (not shown in the figure) rests on the sealing surfaces 7 of the raised region 8 and the container rim 10. After the menu tray has been sealed, atmospheric oxygen can no longer get into the menu tray via the gas passage opening in the raised area 8, since the gas passage opening is closed by the cover.

Claims (1)

  1. Process for the oxygen-free packaging of goods in a container which is open at the top and has a container border, which bounds the container at the top, and a container base, which bounds the container at the bottom and, in one or more regions of the container interior enclosed by the container border, is drawn up to the level of the container border, in which process the goods are introduced into the container, and the air located in the container interior is replaced by an inert gas which is blown from beneath onto the covering through at least one through-passage opening provided in that region of the container base drawn up to the level of the container border, is deflected in the horizontal direction by the covering, is transferred radially into the container interior and is discharged out of the container interior through a gap formed by the container border and the covering, and, after the replacement of the air, the covering is fastened in a gas-tight manner on the container border and the connection between the through-passage opening and the container interior is broken, characterized in that the gas is discharged directly into the atmosphere, and in that the outflow cross-sections for the gas are small enough to produce a sufficient gas pressure in the container interior to displace the air out of the entire container interior without evacuating devices being necessary.
EP93111311A 1992-07-28 1993-07-14 Process for the oxygen-free packaging of goods Expired - Lifetime EP0581123B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4224920A DE4224920A1 (en) 1992-07-28 1992-07-28 Method and device for oxygen-free packaging of goods
DE4224920 1992-07-28

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EP0581123A1 EP0581123A1 (en) 1994-02-02
EP0581123B1 true EP0581123B1 (en) 1996-10-09

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4418492C2 (en) * 1994-05-27 1998-03-19 Heinz Opel Process for packaging, storing and transporting freeze-frozen, chunky frozen products
EP1357035A1 (en) 2002-04-24 2003-10-29 Werner Grabher Method and apparatus for purging containers by means of protective gas
DE102010051543A1 (en) * 2010-11-18 2012-05-24 Krones Aktiengesellschaft Apparatus and method for filling containers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811594A (en) * 1971-11-26 1974-05-21 Jenos Inc Unitary container for a food product
DE2323409C2 (en) * 1973-05-09 1975-01-30 Multivac Sepp Haggenmueller Kg, 8941 Wolfertschwenden Process for packaging filling material which tends to splash when boiling in plastic packaging foils and device for carrying out the process

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DE59304095D1 (en) 1996-11-14
EP0581123A1 (en) 1994-02-02
DE4224920A1 (en) 1994-02-03

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