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EP3747786A1 - Packaging tray with profiled flange - Google Patents

Packaging tray with profiled flange Download PDF

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Publication number
EP3747786A1
EP3747786A1 EP19178257.2A EP19178257A EP3747786A1 EP 3747786 A1 EP3747786 A1 EP 3747786A1 EP 19178257 A EP19178257 A EP 19178257A EP 3747786 A1 EP3747786 A1 EP 3747786A1
Authority
EP
European Patent Office
Prior art keywords
packaging tray
sealing edge
sealing
depressions
contact surface
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.)
Granted
Application number
EP19178257.2A
Other languages
German (de)
French (fr)
Other versions
EP3747786B1 (en
Inventor
René Derks
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Silver Plastics GmbH and Co KG
Original Assignee
Silver Plastics GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
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/US12319465B2/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—Rigid or semi-rigid 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 or 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
    • B65D1/00—Rigid or semi-rigid 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 or 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
    • 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

Definitions

  • the invention relates to a packaging tray made from a deep-drawn plastic film, with a base, side walls and a sealing edge which is formed around the top of the side walls and on which a sealing film can be placed and welded to the sealing edge.
  • Such packaging trays are widely known, including for example on the WO 2011/120715 A1 is referred. In particular, they are used 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 through Application of pressure and / or heat a good connection and seal is achieved.
  • the sealing edge is inevitably contaminated during the filling process. for example by leaking meat juice or components of the filled ready-made meal.
  • impurities on the sealing edge subsequently prevent the reliable welding of the sealing edge with the applied sealing film in this area, so that the sealing of the packaged food is not guaranteed.
  • 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 at the same time ensures reliable welding to the sealing film.
  • the invention proposes the design of a packaging tray in accordance with the features of patent claim 1.
  • the sealing edge is designed as a contact surface intended to support the sealing film with a profile in the form of projections each forming part of the contact surface and between adjacent projections that interrupt the contact surface and that interrupt the contact surface, each of the recesses defining a receiving volume.
  • the receiving volumes defined by the depressions take up any impurities that may adhere to the sealing edge and keep them away from the contact surface, while the adjacent projections, which each form part of the contact surface, over the impurities received in the depressions protrude 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 film in the area of the contact surface and displaces the impurities located underneath on the protrusions and presses them into the depressions.
  • the design of the sealing edge with the profiling provided according to the invention can also 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 operation during the deep-drawing process as part of the design of the packaging tray according to the invention.
  • the packaging tray according to the invention can be produced with comparable effort as a packaging tray according to the prior art.
  • the projections can be designed, for example, as ribs, knobs, triangles and other geometric shapes.
  • the depressions are formed in the form of parallel grooves running around the sealing edge, between each of which a rib runs.
  • Such grooves are characterized in a manner known per se by a design as a fine groove in the contact surface of the sealing edge, they represent a linear depression with a rounded or flat base in a regular shape.
  • the adjacent ribs accordingly also have a regular shape.
  • the sealing edge of the packaging tray according to the invention can in a known and customary manner have a width of about 4 to 6 mm, the invention providing that about 10 to 30 depressions, preferably about 18 to 20, in particular 19 such, when viewed across the width of the sealing edge Wells are arranged.
  • the recesses are designed to be widened towards the contact surface, for example at an angle of approximately 60 °.
  • the depressions are designed at a depth of approximately 0.1 to 0.4 mm and a maximum width of 0.25 to approximately 0.5 mm, in particular at 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 produced, 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 known manner has a base 10 as well as side walls 11, 12 arranged circumferentially around the base 10 and continuing one another, which together define an upwardly open receiving space in which, for example, food can be received and packaged .
  • On the upper side of the side walls 11, 12 these run out into a circumferential, essentially horizontal and parallel to the base 10 extending sealing edge 13, onto which one in the Figure 2 indicated sealing film 2 for closing 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 packaging material received 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, the usual thicknesses of the sealing film used being in a range between 20 and 80 ⁇ m.
  • sealing edge 13 Since it is undesirable in practice, but nevertheless it often happens that the sealing edge 13 is contaminated when the food to be packaged is introduced into the receiving space and before being welded to the sealing film 2, because, for example, liquid drips on the sealing edge 13 in areas, it happens again and again to problems when welding the sealing film 2, since in those areas in which the sealing edge 13 is contaminated with liquid, there is no adequate welding with 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 profile that is derived in greater detail from FIG Figure 2 can be seen.
  • the profile of the sealing edge 13 is formed by a sequence of adjacent projections 133 designed as ribs, between each of 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 film 2 which is also drawn in and rests smoothly on the sealing edge 13, shows that the sealing edge 13 has a contact surface in the area of its upper side which is intended to support the sealing film and which is interrupted by the depressions 134, while the highest points are between the Grooves 134 extending ribs 133 each form a part of the contact surface and are in contact with the sealing film 2 and are also welded to this.
  • the ribs 133 and depressions 134 can, in principle, have any cross-sectional shape, but with a view to the easiest possible production in the deep-drawing process, those from the 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 approximately 60 °.
  • the depressions 134 are formed in the manner of parallel grooves running around the sealing edge 13, between each of which a rib 133 runs.
  • conventional sealing edge widths of approximately 4 to 6 mm
  • approximately 10-30 depressions 134 are preferably provided, each of which, viewed in cross section, has a depth of 0.1 to 0.4 mm and a maximum width of approximately 0.25 to 0.5 mm .
  • the recesses 134 can have a radius of curvature which is, for example, 0.05 mm.
  • the maximum width of the ribs running between the depressions 134 can be approximately 0.3 mm, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Packages (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Abstract

Die Erfindung betrifft eine Verpackungsschale (1), hergestellt aus einer tiefgezogenen Kunststofffolie, mit einem Boden (10), Seitenwänden (11, 12) und einem oberseitig der Seitenwände (11, 12) umlaufend ausgebildeten Siegelrand (13), auf den eine Siegelfolie (2) auflegbar und mit dem Siegelrand (13) verschweißbar ist, bei der der Siegelrand (13) eine zur Auflage der Siegelfolie vorgesehene Kontaktoberfläche mit einer Profilierung in Form von jeweils einen Teil der Kontaktoberfläche bildenden Vorsprüngen (133) und zwischen benachbarten Vorsprüngen (133) verlaufenden, die Kontaktoberfläche unterbrechenden Vertiefungen (134) ausgebildet ist, wobei die Vertiefungen (134) jeweils ein Aufnahmevolumen definieren.

Figure imgaf001
The invention relates to a packaging tray (1) made from a deep-drawn plastic film, with a base (10), side walls (11, 12) and a sealing edge (13) which is formed around the top of the side walls (11, 12) and onto which a sealing film ( 2) can be placed on and welded to the sealing edge (13), in which the sealing edge (13) has a contact surface provided for supporting the sealing film with a profile in the form of projections (133) each forming part of the contact surface and between adjacent projections (133) extending depressions (134) interrupting the contact surface, the depressions (134) each defining a receiving volume.
Figure imgaf001

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.The invention relates to a packaging tray made from a deep-drawn plastic film, with a base, side walls and a sealing edge which is formed around the top of the side walls and on which a sealing film can be placed and welded to the sealing edge.

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, including for example on the WO 2011/120715 A1 is referred. In particular, they are used 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 sealing edge running around the top, 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 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 that the sealing film is welded reliably and easily 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 through 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, especially at high packaging speeds, the sealing edge is inevitably contaminated during the filling process. for example by leaking meat juice or components of the filled ready-made meal. Such impurities on the sealing edge subsequently prevent the reliable welding of the sealing edge with the applied sealing film in this area, so that the sealing of the packaged food is not guaranteed.

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 at the same time 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.In order to achieve the stated object, the invention proposes the design of a packaging tray in accordance with the features of patent claim 1.

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

Der erfindungsgemäße Vorschlag sieht vor, 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.The proposal according to the invention provides that the sealing edge is designed as a contact surface intended to support the sealing film with a profile in the form of projections each forming part of the contact surface and between adjacent projections that interrupt the contact surface and that interrupt the contact surface, each of the recesses defining a receiving volume.

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. 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.It has been shown in practice that the receiving volumes defined by the depressions take up any impurities that may adhere to the sealing edge and keep them away from the contact surface, while the adjacent projections, which each form part of the contact surface, over the impurities received in the depressions protrude 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 film has been applied, a heated sealing or welding bar usually presses on the sealing film in the area of the contact surface and displaces the impurities located underneath on the protrusions and presses them into the depressions. The design of the sealing edge with the profiling provided according to the invention can also 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 operation during the deep-drawing process as part of the design of the packaging tray according to the invention. In this respect, the packaging tray according to the invention can be produced with comparable effort as 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, knobs, 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 depressions are formed in the form of parallel grooves running around the sealing edge, between each of which a rib runs. Such grooves are characterized in a manner known per se by a design as a fine groove in the contact surface of the sealing edge, they represent a linear depression with a rounded or flat base in a regular shape. The adjacent ribs accordingly also have a regular shape.

Der Siegelrand der erfindungsgemäßen Verpackungsschale kann in an sich bekannter und üblicher Weise eine Breite von etwa 4 bis 6 mm aufweisen, wobei erfindungsgemäß vorgesehen ist, dass über die Breite des Siegelrandes betrachtet etwa 10 bis 30 Vertiefungen, vorzugsweise etwa 18 bis 20, insbesondere 19 derartige Vertiefungen angeordnet sind.The sealing edge of the packaging tray according to the invention can in a known and customary manner have a width of about 4 to 6 mm, the invention providing that about 10 to 30 depressions, preferably about 18 to 20, in particular 19 such, when viewed across the width of the sealing edge Wells are arranged.

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, viewed in cross section, the recesses are designed to be widened towards the contact surface, 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. 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.According to a further proposal of the invention, the depressions, viewed in cross section, are designed at a depth of approximately 0.1 to 0.4 mm and a maximum width of 0.25 to approximately 0.5 mm, in particular at 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. 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 produced, 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, the person skilled in the art will recognize that the invention is not restricted to this selection of raw materials. Other non-PET-based plastic films and sealing films 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 refinements and details of the invention are explained in more detail below with reference to the drawing showing an exemplary embodiment. Show it:
Figure 1
a perspective view of a top view of a packaging tray according to the invention;
Figure 2
a partial section through the packaging tray according to Figure 1 along the 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 known manner has a base 10 as well as side walls 11, 12 arranged circumferentially around the base 10 and continuing one another, which together define an upwardly open receiving space in which, for example, food can be received and packaged . On the upper side of the side walls 11, 12 these run out into a circumferential, essentially horizontal and parallel to the base 10 extending sealing edge 13, onto which one in the Figure 2 indicated sealing film 2 for closing 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 packaging material received 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 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, the usual thicknesses of the sealing film used being in a 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.Since it is undesirable in practice, but nevertheless it often happens that the sealing edge 13 is contaminated when the food to be packaged is introduced into the receiving space and before being welded to the sealing film 2, because, for example, liquid drips on the sealing edge 13 in areas, it happens again and again to problems when welding the sealing film 2, since in those areas in which the sealing edge 13 is contaminated with liquid, there is no adequate welding with 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.In order to counter this problem, the sealing edge 13 of the packaging tray 1 shown is provided with a profile that is derived in greater detail from FIG Figure 2 can be seen.

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 profile of the sealing edge 13 is formed by a sequence of adjacent projections 133 designed as ribs, between each of 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 completely over its entire extent and continuously, in accordance with the course of the sealing edge 13, the further ones from FIG Figure 2 apparent parallel depressions 134 and the ribs 133 located therebetween and separating the individual depressions 134 from one another 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, from the representation in Figure 2 that the sealing edge 13 runs parallel to one another over a large number of such and in relation to the one shown here Side wall 12 has recesses 134 and ribs 133 arranged in an alternating sequence.

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, the sealing film 2, which is also drawn in and rests smoothly on the sealing edge 13, shows that the sealing edge 13 has a contact surface in the area of its upper side which is intended to support the sealing film and which is interrupted by the depressions 134, while the highest points are between the Grooves 134 extending ribs 133 each form a part of the contact surface and are in contact with the sealing film 2 and are also welded to this.

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 impurities 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 hold-down force of a welding bar (not shown) that is applied and indicated by arrow F may Contamination located on the sealing edge 13 is displaced into the depressions 134, in which it consequently collects. The upper areas of the ribs 133, which each form part of the contact surface, then protrude beyond the contamination in the depressions 134 and can be connected or welded to the sealing film 2 in the desired manner for the purpose of sealing. To this extent, the depressions 134 form a receiving volume for any contamination 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 the easiest possible production in the deep-drawing process, those from the 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 approximately 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 depressions 134 are formed in the manner of parallel grooves running around the sealing edge 13, between each of which a rib 133 runs. With conventional sealing edge widths of approximately 4 to 6 mm, approximately 10-30 depressions 134 are preferably provided, each of which, viewed in cross section, has a depth of 0.1 to 0.4 mm and a maximum width of approximately 0.25 to 0.5 mm . At the lowest point the recesses 134 can have a radius of curvature which is, for example, 0.05 mm. The maximum width of the ribs running between the depressions 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.The person skilled in the art will, however, recognize that the dimensions disclosed above merely represent an exemplary embodiment and that different dimensions can also be provided for the profiling of the sealing edge 13.

Claims (8)

Verpackungsschale (1), hergestellt aus einer tiefgezogenen Kunststofffolie, mit einem Boden (10), Seitenwänden (11, 12) und einem oberseitig der Seitenwände (11, 12) umlaufend ausgebildeten Siegelrand (13), auf den eine Siegelfolie (2) auflegbar und mit dem Siegelrand (13) verschweißbar ist, dadurch gekennzeichnet, dass der Siegelrand (13) eine zur Auflage der Siegelfolie vorgesehene Kontaktoberfläche mit einer Profilierung in Form von jeweils einen Teil der Kontaktoberfläche bildenden Vorsprüngen (133) und zwischen benachbarten Vorsprüngen (133) verlaufenden, die Kontaktoberfläche unterbrechenden Vertiefungen (134) ausgebildet ist, wobei die Vertiefungen (134) jeweils ein Aufnahmevolumen definieren.Packaging tray (1), made from a deep-drawn plastic film, with a base (10), side walls (11, 12) and a sealing edge (13) formed around the top of the side walls (11, 12) on which a sealing film (2) can be placed and can be welded to the sealing edge (13), characterized in that the sealing edge (13) has a contact surface provided for supporting the sealing film with a profile in the form of projections (133) each forming part of the contact surface and extending between adjacent projections (133), the contact surface interrupting depressions (134) is formed, wherein the depressions (134) each define a receiving volume. Verpackungsschale nach Anspruch 1, dadurch gekennzeichnet, dass die Vorsprünge (133) von Rippen, Noppen und/oder Dreiecken gebildet sind.Packaging tray according to Claim 1, characterized in that the projections (133) are formed by ribs, knobs and / or triangles. Verpackungsschale nach Anspruch 1, dadurch gekennzeichnet, dass die Vertiefungen (134) in Form von parallelen, auf dem Siegelrand (13) umlaufenden Riefen gebildet sind, zwischen denen jeweils ein als Rippe ausgebildeter Vorsprung (133) verläuft.Packaging tray according to Claim 1, characterized in that the depressions (134) are formed in the form of parallel grooves running around the sealing edge (13), between which a projection (133) formed as a rib runs. Verpackungsschale nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Siegelrand (13) eine Breite von 4 bis 6 mm aufweist und über die Breite des Siegelrandes (13) betrachtet 10 bis 30 Vertiefungen (134) angeordnet sind.Packaging tray according to one of Claims 1 to 3, characterized in that the sealing edge (13) has a width of 4 to 6 mm and 10 to 30 depressions (134) are arranged over the width of the sealing edge (13). Verpackungsschale nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Vertiefungen (134) sich im Querschnitt betrachtet zur Kontaktoberfläche hin erweitern.Packaging tray according to one of Claims 1 to 4, characterized in that the depressions (134), viewed in cross section, widen towards the contact surface. Verpackungsschale nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Vertiefungen (134) im Querschnitt betrachtet eine Tiefe von 0,1 bis 0,4 mm und eine maximale Breite von 0,25 bis 0,5 mm aufweisen.Packaging tray according to one of Claims 1 to 5, characterized in that the depressions (134), viewed in cross section, have a depth of 0.1 to 0.4 mm and a maximum width of 0.25 to 0.5 mm. Verpackungsschale nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Kunststofffolie und die Siegelfolie (2) auf Basis von Polyethylenterephthalat gebildet sind.Packaging tray according to one of Claims 1 to 6, characterized in that the plastic film and the sealing film (2) are formed on the basis of polyethylene terephthalate. Verpackungsschale nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Verpackungsschale (1) aus einer Kunststofffolie einer Dicke von 300 bis 800 µm hergestellt ist und die Siegelfolie (2) eine Dicke von 20 bis 80 µm aufweist.Packaging tray according to one of Claims 1 to 7, characterized in that the packaging tray (1) is made from a plastic film with 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)

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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 US12319465B2 (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

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US20210002018A1 (en) 2021-01-07
DK3747786T3 (en) 2022-07-11
US12319465B2 (en) 2025-06-03
EP3747786B1 (en) 2022-04-27
MX2020007506A (en) 2021-01-29

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