EP3747786B1 - Packaging tray with profiled flange - Google Patents

Packaging tray with profiled flange Download PDF

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Publication number
EP3747786B1
EP3747786B1 EP19178257.2A EP19178257A EP3747786B1 EP 3747786 B1 EP3747786 B1 EP 3747786B1 EP 19178257 A EP19178257 A EP 19178257A EP 3747786 B1 EP3747786 B1 EP 3747786B1
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EP
European Patent Office
Prior art keywords
packaging tray
sealing
depressions
film
contact surface
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EP19178257.2A
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German (de)
French (fr)
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EP3747786A1 (en
Inventor
René Derks
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Silver Plastics GmbH and Co KG
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Silver Plastics GmbH and Co KG
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Publication date
Application filed by Silver Plastics GmbH and Co KG filed Critical Silver Plastics GmbH and Co KG
Priority to EP19178257.2A priority Critical patent/EP3747786B1/en
Priority to DK19178257.2T priority patent/DK3747786T3/en
Priority to US16/925,385 priority patent/US20210002018A1/en
Priority to MX2020007506A priority patent/MX2020007506A/en
Priority to CA3087608A priority patent/CA3087608A1/en
Publication of EP3747786A1 publication Critical patent/EP3747786A1/en
Application granted granted Critical
Publication of EP3747786B1 publication Critical patent/EP3747786B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/40—Details of walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/34—Trays or like shallow containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10—Container closures formed after filling
    • B65D2577/20—Container closures formed after filling by applying separate lids or covers
    • B65D2577/2066—Means on, or attached to, container flange facilitating opening, e.g. non-bonding region, cut-out

Definitions

  • the invention relates to a packaging tray, made from a deep-drawn plastic film, with a base, side walls and a sealing edge formed around the upper side of the side walls, onto which a sealing film can be placed and welded to the sealing edge, according to the preamble of patent claim 1.
  • Such packaging trays are widely known, for example on the WO 2011/120715 A1 is referenced. They are used in particular to package perishable foods such as meat or ready-to-eat meals so that they can be offered to consumers in supermarkets, among other places.
  • the material or raw material of the plastic film is matched to the material or raw material of the sealing film, ideally both are based on the same raw material or raw materials that can be easily sealed with one another, so that Application of pressure and / or heat a good connection and seal is achieved.
  • the sealing edge becomes contaminated during the filling process. for example through escaping meat juice or components of the filled ready meal. Such contamination on the sealing edge subsequently prevents the reliable welding of the sealing edge to the sealing film placed on it in this area, so that the sealing of the packaged foodstuff is not guaranteed.
  • the sealing edge is a contact surface provided for supporting the sealing film with a profile in the form of projections each forming part of the contact surface and depressions running between adjacent projections and interrupting the contact surface, with the depressions each defining a receiving volume.
  • the depressions are spatially limited and are delimited by transverse ridges, as a result of which they only provide a limited capacity for liquids.
  • the object of the invention is therefore to propose a packaging tray of the type mentioned at the outset which, while still having a simple structure, is less sensitive to the inevitable contamination of the sealing edge and nevertheless ensures reliable welding to the sealing film.
  • the sealing edge of the packaging tray according to the invention has a width of about 4 to 6 mm, with about 10 to 30 depressions, preferably about 18 to 20, in particular 19 such depressions being arranged over the width of the sealing edge, which run linearly continuously over the entire extent of the sealing edge (13).
  • the holding volume defined by the indentations absorb any contaminants adhering to the sealing edge and away from the contact surface, while the adjacently arranged projections, which each form part of the contact surface, protrude beyond the impurities contained in the depressions and ensure reliable welding of the sealing film placed on the ribs in the area of the contact surface.
  • a heated sealing or welding bar usually presses on the sealing foil in the area of the contact surface and displaces the impurities underneath, standing on the projections and pressing them into the depressions.
  • the design of the sealing edge with the profiling provided according to the invention can be done by appropriate shaping in the deep-drawing tool for producing the packaging tray from the plastic film provided for this purpose without an additional work step during the deep-drawing process in the context of the formation of the packaging tray according to the invention.
  • the packaging tray according to the invention can be produced with a comparable outlay to a packaging tray according to the prior art.
  • the projections can be designed, for example, as ribs, nubs, triangles and other geometric shapes.
  • the indentations are formed in the form of parallel, circumferential grooves on the sealing edge, between which a rib runs.
  • Such grooves are characterized in a manner known per se by being designed as a fine groove in the contact surface of the sealing edge; they represent a linear indentation with a rounded or flat base in a regular shape. Accordingly, the adjacent ribs also have a regular shape.
  • the indentations are expanded towards the contact surface when viewed in cross section, for example at an angle of approximately 60°.
  • the depressions viewed in cross section, have a depth of about 0.1 to 0.4 mm and a maximum width of 0.25 up to about 0.5 mm, in particular with a depth of 0.2 mm and a width of about 0.29 mm in the region of the largest opening in the contact surface.
  • the plastic film and the sealing film are formed on the basis of polyethylene terephthalate, for example on the basis of clear, single-layer (mono) films.
  • Such packaging trays are made, for example, from a plastic film with a thickness of 300 to 800 ⁇ m, the sealing film having a thickness of approximately 20 to 80 ⁇ m.
  • a packaging tray 1 which, in a manner known per se, has a base 10 and continuous side walls 11, 12 which are arranged circumferentially around the base 10 and together define an upwardly open receiving space in which, for example, food can be received and packaged .
  • these run into a peripheral sealing edge 13, which extends essentially horizontally and parallel to the bottom 10 figure 2 indicated sealing film 2 placed to close the receiving space and can be connected along the sealing edge 13 with this by welding.
  • the receiving space within the packaging tray 1, together with the food or other packaged goods contained therein, is thus hermetically sealed from the environment.
  • Such a packaging tray 1 can be produced, for example, from a single-layer (mono) plastic film based on polyethylene terephthalate (PET) with a thickness of 300 to 800 ⁇ m by deep-drawing in a suitable deep-drawing tool.
  • PET polyethylene terephthalate
  • the plastic film used can be clear and therefore transparent or colored.
  • the sealing film 2 is also made from a compatible raw material, preferably the same raw material, for example PET, with typical thicknesses of the sealing film used being in the range between 20 and 80 ⁇ m.
  • the sealing edge 13 becomes contaminated when the foodstuff to be packaged is introduced into the receiving space and before it is welded to the sealing film 2, since liquid drips on the sealing edge 13 in some areas, for example again and again problems when welding the sealing film 2, since in those areas where the sealing edge 13 is contaminated with liquid, it does not sufficiently weld to the sealing edge 13 and thus the hermetic seal of the packaged goods in the receiving space is not guaranteed.
  • the sealing edge 13 of the packaging tray 1 shown is provided with a profiling in more detail from the figure 2 is evident.
  • the profiling of the sealing edge 13 is formed by a sequence of adjacent projections 133 designed as ribs, between which a depression 134 runs. Such an arrangement can easily be produced by appropriate modification of the deep-drawing tool used in the area in which the sealing edge 13 is formed.
  • the sealing edge 13 has a plurality of such parallel depressions and ribs 134 and ribs 133 in an alternating sequence that run parallel to one another and are arranged at increasing distances from one another in relation to the side wall 12 shown here.
  • the sealing edge 13 has a contact surface in the area of its upper side intended for supporting the sealing foil, which is interrupted by the indentations 134, while the highest points of the surface between the Ribs 133 running in depressions 134 each form part of the contact surface and are in contact with the sealing film 2 and are also welded to it.
  • the depressions 134 form a receiving volume for any impurities on the sealing edge 13.
  • the ribs 133 and depressions 134 can in principle have any cross-sectional shape, but with a view to making production as easy as possible in the deep-drawing process figure 2 apparent acute-angled configuration is preferred, in which the individual depressions 134 viewed in cross-section widen towards the contact surface, for example with an opening angle of about 60 °.
  • the indentations 134 are formed in the manner of parallel, circumferential grooves on the sealing edge 13, between which a rib 133 runs.
  • about 10-30 depressions 134 are preferably provided, each of which has a depth of 0.1 to 0.4 mm and a maximum width of about 0.25 to 0.5 mm when viewed in cross section.
  • a rounding radius can be provided, which is 0.05 mm, for example.
  • the maximum width of the ribs running between the indentations 134 can be approximately 0.3 mm, for example.

Description

Die Erfindung betrifft eine Verpackungsschale, hergestellt aus einer tiefgezogenen Kunststofffolie, mit einem Boden, Seitenwänden und einem oberseitig der Seitenwände umlaufend ausgebildeten Siegelrand, auf den eine Siegelfolie auflegbar und mit dem Siegelrand verschweißbar ist, gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a packaging tray, made from a deep-drawn plastic film, with a base, side walls and a sealing edge formed around the upper side of the side walls, onto which a sealing film can be placed and welded to the sealing edge, according to the preamble of patent claim 1.

Derartige Verpackungsschalen sind vielfältig bekannt, wozu beispielhaft auf die WO 2011/120715 A1 verwiesen wird. Sie dienen insbesondere dazu, leicht verderbliche Lebensmittel, wie Fleisch, oder auch Fertigmahlzeiten verkaufsfähig zu verpacken, damit diese u.a. in Supermärkten den Verbrauchern angeboten werden können.Such packaging trays are widely known, for example on the WO 2011/120715 A1 is referenced. They are used in particular to package perishable foods such as meat or ready-to-eat meals so that they can be offered to consumers in supermarkets, among other places.

Bei der Verwendung als Lebensmittelverpackung ist es üblich, derartige Verpackungsschalen mit einem oberseitig umlaufenden Siegelrand zu versehen, auf dem nach Befüllung der Verpackungsschale mit dem zu verpackenden Lebensmittel eine Siegelfolie aufgelegt und mit dem Siegelrand verschweißt bzw. versiegelt wird, sodass das Lebensmittel in der Verpackungsschale hermetisch eingeschlossen und vor Umgebungseinflüssen geschützt ist.When used as food packaging, it is customary to provide such packaging trays with a peripheral sealing edge on the upper side, on which, after the packaging tray has been filled with the food to be packaged, a sealing film is placed and welded or sealed to the sealing edge, so that the food in the packaging tray is hermetically sealed is enclosed and protected from environmental influences.

Um eine zuverlässige und leicht herstellbare Verschweißung der Siegelfolie mit dem Siegelrand zu gewährleisten, wird das Material bzw. der Rohstoff der Kunststofffolie auf das Material bzw. den Rohstoff der Siegelfolie abgestimmt, idealerweise basieren beide auf dem gleichen Rohstoff oder miteinander gut siegelbaren Rohstoffen, sodass durch Anwendung von Druck und/oder Wärme eine gute Verbindung und Abdichtung erzielt wird.In order to ensure reliable and easy-to-manufacture welding of the sealing film to the sealing edge, the material or raw material of the plastic film is matched to the material or raw material of the sealing film, ideally both are based on the same raw material or raw materials that can be easily sealed with one another, so that Application of pressure and / or heat a good connection and seal is achieved.

In der Praxis kommt es jedoch bei der Befüllung der Verpackungsschale mit dem zu verpackenden Lebensmittel insbesondere bei hoher Verpackungsgeschwindigkeit unvermeidlich vor, dass der Siegelrand während des Befüllvorganges verunreinigt wird, beispielsweise durch austretenden Fleischsaft oder Bestandteile der abgefüllten Fertigmahlzeit. Derartige Verunreinigungen auf dem Siegelrand verhindern nachfolgend in diesem Bereich die zuverlässige Verschweißung des Siegelrandes mit der aufgelegten Siegelfolie, sodass die Abdichtung des verpackten Lebensmittels nicht gewährleistet ist.In practice, however, when the packaging tray is filled with the food to be packaged, particularly at high packaging speeds, it is unavoidable that the sealing edge becomes contaminated during the filling process. for example through escaping meat juice or components of the filled ready meal. Such contamination on the sealing edge subsequently prevents the reliable welding of the sealing edge to the sealing film placed on it in this area, so that the sealing of the packaged foodstuff is not guaranteed.

In der WO 2010/018304 A1 wird vorgeschlagen, dass der Siegelrand eine zur Auflage der Siegelfolie vorgesehene Kontaktoberfläche mit einer Profilierung in Form von jeweils einen Teil der Kontaktoberfläche bildenden Vorsprüngen und zwischen benachbarten Vorsprüngen verlaufenden, die Kontaktoberfläche unterbrechenden Vertiefungen ausgebildet ist, wobei die Vertiefungen jeweils ein Aufnahmevolumen definieren. Die Vertiefungen sind allerdings räumlich begrenzt und werden von querverlaufenden Stegen begrenzt, wodurch sie nur ein begrenztes Aufnahmevolumen für Flüssigkeiten bereitstellen.In the WO 2010/018304 A1 it is proposed that the sealing edge is a contact surface provided for supporting the sealing film with a profile in the form of projections each forming part of the contact surface and depressions running between adjacent projections and interrupting the contact surface, with the depressions each defining a receiving volume. However, the depressions are spatially limited and are delimited by transverse ridges, as a result of which they only provide a limited capacity for liquids.

Aufgabe der Erfindung ist es daher, eine Verpackungsschale der eingangs genannten Art vorzuschlagen, die bei weiterhin einfachem Aufbau gegenüber den unvermeidlich auftretenden Verunreinigungen des Siegelrandes unempfindlicher ist und gleichwohl eine zuverlässige Verschweißung mit der Siegelfolie gewährleistet.The object of the invention is therefore to propose a packaging tray of the type mentioned at the outset which, while still having a simple structure, is less sensitive to the inevitable contamination of the sealing edge and nevertheless ensures reliable welding to the sealing film.

Zur Lösung der gestellten Aufgabe wird erfindungsgemäß die Ausgestaltung einer Verpackungsschale gemäß den Merkmalen des Patentanspruches 1 vorgeschlagen.To solve the problem, the design of a packaging tray according to the features of patent claim 1 is proposed according to the invention.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.Advantageous refinements and developments of the invention are the subject matter of the dependent claims.

Der erfindungsgemäße Vorschlag sieht vor, dass der Siegelrand der erfindungsgemä-ßen Verpackungsschale eine Breite von etwa 4 bis 6 mm aufweist, wobei über die Breite des Siegelrandes betrachtet etwa 10 bis 30 Vertiefungen, vorzugsweise etwa 18 bis 20, insbesondere 19 derartige Vertiefungen angeordnet sind, die linienförmig durchgängig über die gesamte Erstreckung des Siegelrandes (13) verlaufen.The proposal according to the invention provides that the sealing edge of the packaging tray according to the invention has a width of about 4 to 6 mm, with about 10 to 30 depressions, preferably about 18 to 20, in particular 19 such depressions being arranged over the width of the sealing edge, which run linearly continuously over the entire extent of the sealing edge (13).

Es hat sich in der Praxis gezeigt, dass die durch die Vertiefungen definierten Aufnahmevolumen die eventuell auf dem Siegelrand anhaftenden Verunreinigungen aufnehmen und von der Kontaktoberfläche fernhalten, während die benachbart angeordneten Vorsprünge, welche jeweils einen Teil der Kontaktoberfläche bilden, über die in den Vertiefungen aufgenommenen Verunreinigungen hervorstehen und eine zuverlässige Verschweißung der auf die Rippen aufgelegten Siegelfolie im Bereich der Kontaktoberfläche gewährleisten. Dieser Vorgang wird dadurch unterstützt, dass nach dem Auflegen der Siegelfolie üblicherweise ein beheizter Siegel- oder Schweißbalken im Bereich der Kontaktoberfläche auf die Siegelfolie drückt und die darunter befindlichen, auf den Vorsprüngen stehenden Verunreinigungen verdrängt und in die Vertiefungen drückt.It has been shown in practice that the holding volume defined by the indentations absorb any contaminants adhering to the sealing edge and away from the contact surface, while the adjacently arranged projections, which each form part of the contact surface, protrude beyond the impurities contained in the depressions and ensure reliable welding of the sealing film placed on the ribs in the area of the contact surface. This process is supported by the fact that after the sealing foil has been placed on it, a heated sealing or welding bar usually presses on the sealing foil in the area of the contact surface and displaces the impurities underneath, standing on the projections and pressing them into the depressions.

Die Ausgestaltung des Siegelrandes mit der erfindungsgemäß vorgesehenen Profilierung kann durch entsprechende Formgebung im Tiefziehwerkzeug zur Herstellung der Verpackungsschale aus der hierfür vorgesehenen Kunststofffolie ohne zusätzlichen Arbeitsgang während des Tiefziehvorgangs im Rahmen der Ausbildung der erfindungsgemäßen Verpackungsschale gleichermaßen erfolgen. Insoweit lässt sich die erfindungsgemäße Verpackungsschale mit vergleichbarem Aufwand wie eine Verpackungsschale nach dem Stand der Technik herstellen.The design of the sealing edge with the profiling provided according to the invention can be done by appropriate shaping in the deep-drawing tool for producing the packaging tray from the plastic film provided for this purpose without an additional work step during the deep-drawing process in the context of the formation of the packaging tray according to the invention. In this respect, the packaging tray according to the invention can be produced with a comparable outlay to a packaging tray according to the prior art.

Die Vorsprünge können beispielsweise als Rippen, Noppen, Dreiecke und andere geometrische Formen ausgebildet sein.The projections can be designed, for example, as ribs, nubs, triangles and other geometric shapes.

Nach einem Vorschlag der Erfindung sind die Vertiefungen in Form von parallelen, auf dem Siegelrand umlaufenden Riefen gebildet, zwischen denen jeweils eine Rippe verläuft. Solche Riefen zeichnen sich in an sich bekannter Weise durch eine Gestaltung als feine Rille in der Kontaktoberfläche des Siegelrandes aus, sie stellen eine linienförmige Vertiefung mit gerundetem oder flachem Grund in regelmäßiger Form dar. Dementsprechend weisen auch die benachbarten Rippen eine regelmäßige Form auf.According to a proposal of the invention, the indentations are formed in the form of parallel, circumferential grooves on the sealing edge, between which a rib runs. Such grooves are characterized in a manner known per se by being designed as a fine groove in the contact surface of the sealing edge; they represent a linear indentation with a rounded or flat base in a regular shape. Accordingly, the adjacent ribs also have a regular shape.

Die Vertiefungen sind nach einem weiteren Vorschlag der Erfindung im Querschnitt betrachtet zur Kontaktoberfläche hin erweitert ausgeführt, beispielsweise unter einem Winkel von etwa 60°.According to a further proposal of the invention, the indentations are expanded towards the contact surface when viewed in cross section, for example at an angle of approximately 60°.

Nach einem weiteren Vorschlag der Erfindung sind die Vertiefungen im Querschnitt betrachtet in einer Tiefe von etwa 0,1 bis 0,4 mm und einer maximalen Breite von 0,25 bis etwa 0,5 mm ausgeführt, insbesondere in einer Tiefe von 0,2 mm und einer Breite von etwa 0,29 mm im Bereich der größten Öffnung in der Kontaktoberfläche.According to a further proposal of the invention, the depressions, viewed in cross section, have a depth of about 0.1 to 0.4 mm and a maximum width of 0.25 up to about 0.5 mm, in particular with a depth of 0.2 mm and a width of about 0.29 mm in the region of the largest opening in the contact surface.

Weiterhin kann vorgesehen sein, dass die Kunststofffolie und die Siegelfolie auf Basis von Polyethylenterephthalat gebildet sind, beispielsweise auf Basis von klaren, einschichtigen (Mono-)Folien. Derartige Verpackungsschalen werden beispielsweise aus einer Kunststofffolie einer Dicke von 300 bis 800 µm hergestellt, wobei die Siegelfolie eine Dicke von etwa 20 bis 80 µm aufweist.Furthermore, it can be provided that the plastic film and the sealing film are formed on the basis of polyethylene terephthalate, for example on the basis of clear, single-layer (mono) films. Such packaging trays are made, for example, from a plastic film with a thickness of 300 to 800 μm, the sealing film having a thickness of approximately 20 to 80 μm.

Der Fachmann wird jedoch erkennen, dass die Erfindung nicht auf diese Rohstoffauswahl beschränkt ist. Es können auch andere, nicht auf PET basierende Kunststofffolien und Siegelfolien zur Anwendung kommen.However, those skilled in the art will recognize that the invention is not limited to this raw material selection. Other plastic films and sealing films not based on PET can also be used.

Weitere Ausgestaltungen und Einzelheiten der Erfindung werden nachfolgend anhand der ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Es zeigen:

Figur 1
in perspektivischer Darstellung die Aufsicht auf eine Verpackungsschale gemäß der Erfindung;
Figur 2
einen Teilschnitt durch die Verpackungsschale gemäß Figur 1 entlang der Linie A-A
Further configurations and details of the invention are explained in more detail below with reference to the drawing, which shows an exemplary embodiment. Show it:
figure 1
in a perspective view the top view of a packaging tray according to the invention;
figure 2
according to a partial section through the packaging tray figure 1 along line AA

Aus der Figur 1 ist eine Verpackungsschale 1 ersichtlich, die in an sich bekannter Weise einen Boden 10 sowie umlaufend um den Boden 10 angeordnete und einander fortsetzende Seitenwände 11,12 aufweist, die gemeinsam einen nach oben offenen Aufnahmeraum umgrenzen, in welchem beispielsweise ein Lebensmittel aufgenommen und verpackt werden kann. Oberseitig der Seitenwände 11,12 laufen diese in einen umlaufenden, sich im Wesentlichen horizontal und parallel zum Boden 10 erstreckenden Siegelrand 13 aus, auf den eine in der Figur 2 angedeutete Siegelfolie 2 zum Verschluss des Aufnahmeraumes aufgelegt und entlang des Siegelrandes 13 mit diesem durch Verschweißen verbunden werden kann. Der Aufnahmeraum innerhalb der Verpackungsschale 1 mitsamt des darin aufgenommenen Lebensmittels oder anderen Verpackungsgutes wird somit hermetisch gegenüber der Umgebung abgedichtet.From the figure 1 a packaging tray 1 can be seen which, in a manner known per se, has a base 10 and continuous side walls 11, 12 which are arranged circumferentially around the base 10 and together define an upwardly open receiving space in which, for example, food can be received and packaged . At the top of the side walls 11,12, these run into a peripheral sealing edge 13, which extends essentially horizontally and parallel to the bottom 10 figure 2 indicated sealing film 2 placed to close the receiving space and can be connected along the sealing edge 13 with this by welding. The receiving space within the packaging tray 1, together with the food or other packaged goods contained therein, is thus hermetically sealed from the environment.

Eine solche Verpackungsschale 1 kann beispielsweise aus einer einschichtigen (Mono-) Kunststofffolie auf Basis von Polyethylenterephthalat (PET) einer Dicke von 300 bis 800 µm durch Tiefziehen in einem geeigneten Tiefziehwerkzeug hergestellt werden. Die verwendete Kunststofffolie kann klar und damit transparent oder auch eingefärbt sein. Auch die Siegelfolie 2 ist im Interesse einer guten Verschweißbarkeit aus einem kompatiblen Rohstoff, vorzugsweise dem gleichen Rohstoff, beispielsweise PET, hergestellt, wobei übliche Dicken der verwendeten Siegelfolie einen Bereich zwischen 20 und 80 µm umfassen.Such a packaging tray 1 can be produced, for example, from a single-layer (mono) plastic film based on polyethylene terephthalate (PET) with a thickness of 300 to 800 μm by deep-drawing in a suitable deep-drawing tool. The plastic film used can be clear and therefore transparent or colored. In the interest of good weldability, the sealing film 2 is also made from a compatible raw material, preferably the same raw material, for example PET, with typical thicknesses of the sealing film used being in the range between 20 and 80 μm.

Da es in der Praxis zwar unerwünscht ist, aber gleichwohl häufig vorkommt, dass der Siegelrand 13 beim Einbringen des zu verpackenden Lebensmittels in den Aufnahmeraum und vor dem Verschweißen mit der Siegelfolie 2 verunreinigt wird, da beispielsweise Flüssigkeit auf dem Siegelrand 13 bereichsweise tropft, kommt es immer wieder zu Problemen beim Verschweißen der Siegelfolie 2, da diese in solchen Bereichen, in denen der Siegelrand 13 mit Flüssigkeit verunreinigt ist, keine ausreichende Verschweißung mit dem Siegelrand 13 eingeht und somit der hermetische Verschluss des im Aufnahmeraum befindlichen Verpackungsgutes nicht gewährleistet ist.Although it is undesirable in practice, it often happens that the sealing edge 13 becomes contaminated when the foodstuff to be packaged is introduced into the receiving space and before it is welded to the sealing film 2, since liquid drips on the sealing edge 13 in some areas, for example again and again problems when welding the sealing film 2, since in those areas where the sealing edge 13 is contaminated with liquid, it does not sufficiently weld to the sealing edge 13 and thus the hermetic seal of the packaged goods in the receiving space is not guaranteed.

Um diesem Problem zu begegnen, ist der Siegelrand 13 der dargestellten Verpackungsschale 1 mit einer Profilierung versehen, die in näheren Einzelheiten aus der Figur 2 ersichtlich ist.To address this problem, the sealing edge 13 of the packaging tray 1 shown is provided with a profiling in more detail from the figure 2 is evident.

Die Profilierung des Siegelrandes 13 wird gebildet durch eine Abfolge benachbarter als Rippen ausgebildeter Vorsprünge 133, zwischen denen jeweils eine Vertiefung 134 verläuft. Eine solche Anordnung kann durch entsprechende Modifikation des verwendeten Tiefziehwerkzeuges in dem Bereich, in welchem der Siegelrand 13 ausgebildet wird, leicht hergestellt werden.The profiling of the sealing edge 13 is formed by a sequence of adjacent projections 133 designed as ribs, between which a depression 134 runs. Such an arrangement can easily be produced by appropriate modification of the deep-drawing tool used in the area in which the sealing edge 13 is formed.

In der Figur 1 ist schematisch der Verlauf einer einzelnen Vertiefung 134 angedeutet. Man erkennt, dass diese entsprechend dem Verlauf des Siegelrandes 13 vollständig über dessen gesamte Erstreckung und durchgängig verläuft, wobei zum Zwecke der besseren Übersichtlichkeit die weiteren aus der Figur 2 ersichtlichen parallel verlaufenden Vertiefungen 134 und die jeweils dazwischen befindlichen und die einzelnen Vertiefungen 134 voneinander trennenden Rippen 133 in der Figur 1 nicht dargestellt sind.In the figure 1 the course of a single depression 134 is indicated schematically. It can be seen that this runs according to the course of the sealing edge 13 completely over its entire extent and continuously, with the further ones from FIG figure 2 visible parallel depressions 134 and the respective intermediate and the individual depressions 134 separating ribs 133 in the figure 1 are not shown.

Man erkennt jedoch aus der Darstellung in Figur 2, dass der Siegelrand 13 über eine Vielzahl derartiger parallel zueinander verlaufender und in Bezug auf die hier dargestellte Seitenwand 12 in größer werdendem Abstand angeordnete Vertiefungen 134 und Rippen 133 in abwechselnder Folge verfügt.However, one can see from the representation in figure 2 that the sealing edge 13 has a plurality of such parallel depressions and ribs 134 and ribs 133 in an alternating sequence that run parallel to one another and are arranged at increasing distances from one another in relation to the side wall 12 shown here.

Ferner wird anhand der ebenfalls eingezeichneten und auf dem Siegelrand 13 glatt aufliegenden Siegelfolie 2 ersichtlich, dass der Siegelrand 13 eine zur Auflage der Siegelfolie vorgesehene Kontaktoberfläche im Bereich seiner Oberseite aufweist, die jeweils von den Vertiefungen 134 unterbrochen wird, während die höchsten Punkte der zwischen den Vertiefungen 134 verlaufenden Rippen 133 jeweils einen Teil der Kontaktoberfläche bilden und mit der Siegelfolie 2 in Kontakt stehen und auch mit dieser verschweißt sind.Furthermore, based on the sealing foil 2, which is also shown and lies flat on the sealing edge 13, it can be seen that the sealing edge 13 has a contact surface in the area of its upper side intended for supporting the sealing foil, which is interrupted by the indentations 134, while the highest points of the surface between the Ribs 133 running in depressions 134 each form part of the contact surface and are in contact with the sealing film 2 and are also welded to it.

Es hat sich gezeigt, dass etwaige auf dem Siegelrand 13 befindliche Verunreinigungen insbesondere in flüssiger Form die Verschweißung der Siegelfolie 2 mit dem Siegelrand 13 nicht beeinträchtigen, da während des Verschweißvorganges durch die aufgebrachte und mit Pfeil F angedeutete Niederhaltekraft eines Schweißbalkens (nicht dargestellt) die eventuell auf dem Siegelrand 13 befindliche Verunreinigung in die Vertiefungen 134 verdrängt wird, in denen sie sich folglich ansammelt. Die oberen und jeweils einen Teil der Kontaktoberfläche bildenden Bereiche der Rippen 133 ragen dann jedoch über die Verunreinigung in den Vertiefungen 134 hervor und können in der gewünschten Weise mit der Siegelfolie 2 zum Zwecke der Abdichtung verbunden bzw. verschweißt werden. Die Vertiefungen 134 bilden insoweit ein Aufnahmevolumen für etwaige Verunreinigungen auf dem Siegelrand 13.It has been shown that any contaminants on the sealing edge 13, especially in liquid form, do not impair the welding of the sealing film 2 to the sealing edge 13, since during the welding process the applied hold-down force of a welding bar (not shown) indicated by arrow F contamination located on the sealing edge 13 is displaced into the depressions 134, in which it consequently accumulates. However, the upper areas of the ribs 133, each of which forms part of the contact surface, then protrude beyond the dirt in the depressions 134 and can be connected or welded in the desired manner to the sealing film 2 for the purpose of sealing. In this respect, the depressions 134 form a receiving volume for any impurities on the sealing edge 13.

Die Rippen 133 und Vertiefungen 134 können im Prinzip beliebige Querschnittsformen aufweisen, wobei jedoch im Hinblick auf eine möglichst leichte Herstellung im Tiefziehverfahren die auch aus der Figur 2 ersichtliche spitzwinklige Konfiguration bevorzugt wird, bei der sich die einzelnen Vertiefungen 134 im Querschnitt betrachtet zur Kontaktoberfläche hin erweitern, beispielsweise mit einem Öffnungswinkel von etwa 60°.The ribs 133 and depressions 134 can in principle have any cross-sectional shape, but with a view to making production as easy as possible in the deep-drawing process figure 2 apparent acute-angled configuration is preferred, in which the individual depressions 134 viewed in cross-section widen towards the contact surface, for example with an opening angle of about 60 °.

Die Vertiefungen 134 sind in diesem Falle nach Art von parallelen, auf dem Siegelrand 13 umlaufenden Riefen gebildet, zwischen denen jeweils eine Rippe 133 verläuft. Bei üblichen Siegelrandbreiten von etwa 4 bis 6 mm sind vorzugsweise etwa 10-30 Vertiefungen 134 vorgesehen, die jeweils im Querschnitt betrachtet eine Tiefe von 0,1 bis 0,4 mm und eine maximale Breite von etwa 0,25 bis 0,5 mm aufweisen. Am tiefsten Punkt der Vertiefungen 134 kann ein Rundungsradius vorgesehen sein, der beispielsweise 0,05 mm beträgt. Die maximale Breite der zwischen den Vertiefungen 134 verlaufenden Rippen kann beispielsweise etwa 0,3 mm betragen.In this case, the indentations 134 are formed in the manner of parallel, circumferential grooves on the sealing edge 13, between which a rib 133 runs. at For the usual sealing edge widths of about 4 to 6 mm, about 10-30 depressions 134 are preferably provided, each of which has a depth of 0.1 to 0.4 mm and a maximum width of about 0.25 to 0.5 mm when viewed in cross section. At the deepest point of the depressions 134, a rounding radius can be provided, which is 0.05 mm, for example. The maximum width of the ribs running between the indentations 134 can be approximately 0.3 mm, for example.

Der Fachmann wird jedoch erkennen, dass die vorangehend offenbarten Dimensionen lediglich ein Ausführungsbeispiel darstellen und auch abweichende Dimensionierungen für die Profilierung des Siegelrandes 13 vorgesehen werden können, wobei die erfindungsgemäßen Dimensionen in den folgenden Ansprüchen definiert sind.However, the person skilled in the art will recognize that the dimensions disclosed above merely represent an exemplary embodiment and that different dimensions for the profiling of the sealing edge 13 can also be provided, with the dimensions according to the invention being defined in the following claims.

Claims (7)

  1. Packaging tray (1), manufactured from a deep-drawn plastics film, comprising a base (10), side walls (11, 12) and a sealing rim (13) which is formed circumferentially on the upper side of the side walls (11, 12) and onto which a sealing film (2) can be laid and welded to the sealing rim (13), wherein the sealing rim (13) has a contact surface provided for supporting the sealing film with a profiling in the form of projections (133) each forming part of the contact surface and depressions (134) extending between adjacent projections (133) and interrupting the contact surface, the depressions (134) each defining a receiving volume, characterised in that the sealing rim (13) has a width of 4 to 6 mm and, viewed across the width of the sealing rim (13), 10 to 30 depressions (134) are arranged, which extend continuously in a linear manner over the entire extent of the sealing rim (13).
  2. Packaging tray according to claim 1, characterised in that the projections (133) are formed by ribs, pimples and/or triangles.
  3. Packaging tray according to claim 1, characterised in that the depressions (134) are formed as parallel grooves running around the sealing rim (13), between each of which a projection (133) in the form of a rib extends.
  4. Packaging tray according to any one of claims 1 to 3, characterised in that the depressions (134) widen towards the contact surface when viewed in cross-section.
  5. Packaging tray according to any one of claims 1 to 4, characterised in that the depressions (134) have a depth of 0.1 to 0.4 mm and a maximum width of 0.25 to 0.5 mm when viewed in cross-section.
  6. Packaging tray according to any one of claims 1 to 5, characterised in that the plastics film and the sealing film (2) are formed on the basis of polyethylene terephthalate.
  7. Packaging tray according to any one of claims 1 to 6, characterised in that the packaging tray (1) is manufactured from a plastic film having a thickness of 300 to 800 µm and the sealing film (2) has a thickness of 20 to 80 µm.
EP19178257.2A 2019-06-04 2019-06-04 Packaging tray with profiled flange Active EP3747786B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP19178257.2A EP3747786B1 (en) 2019-06-04 2019-06-04 Packaging tray with profiled flange
DK19178257.2T DK3747786T3 (en) 2019-06-04 2019-06-04 PACKAGING TRAY WITH PROFILED SEALING EDGE
US16/925,385 US20210002018A1 (en) 2019-06-04 2020-07-10 Packaging tray with a profiled sealing edge
MX2020007506A MX2020007506A (en) 2019-06-04 2020-07-13 Packaging tray with a profiled sealing edge.
CA3087608A CA3087608A1 (en) 2019-06-04 2020-07-17 Packaging tray with a profiled sealing edge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19178257.2A EP3747786B1 (en) 2019-06-04 2019-06-04 Packaging tray with profiled flange

Publications (2)

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EP3747786A1 EP3747786A1 (en) 2020-12-09
EP3747786B1 true EP3747786B1 (en) 2022-04-27

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EP19178257.2A Active EP3747786B1 (en) 2019-06-04 2019-06-04 Packaging tray with profiled flange

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US (1) US20210002018A1 (en)
EP (1) EP3747786B1 (en)
CA (1) CA3087608A1 (en)
DK (1) DK3747786T3 (en)
MX (1) MX2020007506A (en)

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USD950321S1 (en) * 2020-02-12 2022-05-03 Dart Industries Inc. Storage container
GB2621969A (en) 2022-05-16 2024-03-06 Sharp Interpack Ltd Packaging tray with sealing flange

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MX2020007506A (en) 2021-01-29
CA3087608A1 (en) 2020-12-04
US20210002018A1 (en) 2021-01-07
DK3747786T3 (en) 2022-07-11
EP3747786A1 (en) 2020-12-09

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