EP1052186B1 - Mehrschichtige Struktur für wiederverschliessbaren Behälterverschluss - Google Patents

Mehrschichtige Struktur für wiederverschliessbaren Behälterverschluss Download PDF

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Publication number
EP1052186B1
EP1052186B1 EP00108050A EP00108050A EP1052186B1 EP 1052186 B1 EP1052186 B1 EP 1052186B1 EP 00108050 A EP00108050 A EP 00108050A EP 00108050 A EP00108050 A EP 00108050A EP 1052186 B1 EP1052186 B1 EP 1052186B1
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EP
European Patent Office
Prior art keywords
layer
container
multilayer structure
thermal bonding
layers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00108050A
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English (en)
French (fr)
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EP1052186A3 (de
EP1052186A2 (de
Inventor
Clemente Celano
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.)
Di Mauro Officine Grafiche SpA
Original Assignee
Di Mauro Officine Grafiche SpA
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Publication of EP1052186A3 publication Critical patent/EP1052186A3/de
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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
    • 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
    • B65D77/2068—Means for reclosing the cover after its first opening
    • B65D77/2096—Adhesive means
    • 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
    • B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure

Definitions

  • the present invention relates to a multilayer structure for closing containers, suitable for providing containers which can be re-closed several times after their initial opening.
  • Tray-like containers are constituted by a lower thermoformed portion, designed to contain the product, and by an upper portion, designed to close the container.
  • the lower portion and the upper portion designed for closure can both be flexible or rigid and be of the single-layer or multilayer type.
  • the lower portion is produced on-line by the packaging machine by thermoforming a film made of flat synthetic material.
  • the lower portion is already preformed when it is introduced in the packaging machine.
  • the container is closed by thermal bonding performed along the perimeter of the tray where the two portions overlap.
  • the production and packaging method is similar, except that the lower portion is not subjected to thermoformation.
  • One of the re-closure systems currently in use is based on using, in order to close tray-like containers, a multilayer structure comprising at least three layers: a first layer, constituted by a film of material which allows thermal bonding and is designed to be subjected to thermal bonding at the rim of the opening of the container, a second outer layer; and a third layer of permanent adhesive interposed between the first layer and the second layer.
  • the bonding force between the adhesive layer and the first layer is weaker than the resistance to separation of the thermal bonding performed in order to apply the multilayer structure to the tray-like container.
  • This multilayer structure requires a large amount of permanent adhesive, since the layer of permanent adhesive that is used, besides allowing to re-close the container, also mutually couples the first layer and the second layer.
  • FR-A-2 669 607 discloses a re-closure system of the above-described type having a layer of permanent adhesive which mutually couples to the first and second layers at the entire extension of the multilayer structure.
  • EP-A-0 554 152 discloses another re-closure system of the above described type.
  • the layer of permanent adhesive is arranged along the whole perimeter of the opening of the container, in other embodiments the layer of permanent adhesive is limited exclusively at only a part of the perimeter of said opening. However, in the latter case there are zones where the first layer is not attached to the container.
  • the aim of the present invention is to solve the above-described problems, by providing a multilayer structure for closing containers which is adapted for forming containers which can be re-closed several times after their initial opening and allows to reduce the use of permanent adhesives with respect to conventional multilayer structures.
  • an object of the present invention is to provide a multilayer structure which can be manufactured at a lower cost than conventional multilayer structures.
  • a further object of the present invention is to provide a multilayer structure which allows to also use permanent adhesives with reduced bonding force for reclosing the containers after their first opening.
  • the multilayer structure according to the invention comprises at least two layers: a first layer 2, constituted by a film of material which is adapted for thermal bonding, designed to be subjected to thermal bonding along the whole perimeter of the opening 3 of a container 4, and a second layer 5, which is coupled to the first layer 2 on the face thereof that lies opposite the face designed to be coupled to the container 4 by thermal bonding.
  • a third layer 6 of permanent adhesive is interposed between the first layer 2 and the second layer 5.
  • the presence of the third layer 6 is limited exclusively at only a part of the region of the first layer 2 designed to be coupled to the container 4 by thermal bonding, i.e. the third layer 6 is omitted at certain portions of the region 10 for the thermal bonding of the first layer 2 on the container 4.
  • the container 4 has a substantially rectangular opening, it is possible to provide the third layer 6 only at three of the four sides along which thermal bonding is performed, so that the container 4 can be opened, so as to allow re-closure, by removing the multilayer structure 1 only along said three sides.
  • the tear resistance of the first layer 2 is weaker than the bonding force between the first layer 2 and the second layer 5, where the third layer 6 is not present, and is weaker than the resistance to separation of the thermal bonding 10 to be performed between the first layer 2 and the container 4.
  • the resistance to separation of the thermal bonding 10 is greater than the cohesion and/or bonding force of the permanent adhesive of the third layer 6, so that during the first opening of the container 4 the first layer 2 tears, exposing the third layer 6, which can thus be used to re-close the container 4 several times.
  • the first layer 2 can be constituted by a film made of synthetic material suitable for thermal bonding, such as polyethylene.
  • the second layer 5 can be constituted by a flexible or rigid synthetic material, such as an oriented polymer or polyvinyl chloride (PVC) or polyethylene or other synthetic materials.
  • a flexible or rigid synthetic material such as an oriented polymer or polyvinyl chloride (PVC) or polyethylene or other synthetic materials.
  • the third layer 6 can be constituted, for example, by an acrylic polymer.
  • the second layer 5 can be constituted by a barrier film or by a film which bears printing or can be substantially of the same material used for the first layer 2 and can optionally be coupled to one or more additional films with the face that lies opposite the face directed toward the first layer 1.
  • the second layer 5 can be constituted by a rigid thermoformable film or can be coupled to a thermoformable rigid film with its side that faces away from the first layer 2.
  • the first layer 2 and the second layer 5 can be mutually coupled by heat calendering, or each one of the two layers 2 and 5 can be provided, according to the method known as extrusion coating, on the other layer.
  • the layer 2 and the layer 5 can be coupled one another with the method known as extrusion lamination.
  • the layer 6 of permanent adhesive is interposed on the side of the first layer 2 that faces the second layer 5 or, alternatively, on the side of the second layer 5 that faces the first layer 2, before their coupling, or alternatively before the coating of one of the two layers on the other layer, at the region designed to be affected by the thermal bonding 10 on the perimeter of the opening of the container 4.
  • the presence of the layer 6 of permanent adhesive prevents permanent coupling between the layers 2 and 5 only in the regions where said layer 6 has been applied.
  • the layer 6 in any case provides a bonding between the layers 2 and 5 which assuredly seals the package.
  • the layers 2 and 5 are mutually coupled also outside the region of the first layer 2 designed to be coupled to the container 4 by thermal bonding and occupied by the third layer 6.
  • the cohesion force between the third layer 6 and the second layer 5 is stronger than the cohesion force between the third layer 6 and the first layer 2, so that during the separation of the layer 5 from the layer 2, at the layer 6, the layer 6 remains bonded to the layer 5.
  • This can be achieved by appropriately selecting the materials of the layers 2 and 5 or by means of a different degree of roughness on the faces of the layers 2 and 5 that couple to the layer 6.
  • the thermal bonding can affect only partially the region where the multilayer structure according to the invention overlaps the perimeter of the opening 3 of the container.
  • the container 4 can be constituted by a tray or even simply by a substantially flat structure constituted by a single film or by a plurality of coupled films, as in the case of pouch-type containers.
  • the container closed by means of the multilayer structure according to the invention is opened by lifting a flap of the multilayer structure 1 that lies outside the thermal bonding 10, as shown in Figure 4.
  • Said free flap designed to be gripped in order to open the container 4, is provided in a region of the multilayer structure 1 that is adjacent to the region in which the layer 6 of permanent adhesive is present.
  • the tearing of the first layer 2 at the region affected by the thermal bonding 10 exposes the layer 6, which can be used to re-close the container, even several times, after its initial opening.
  • the multilayer structure according to the invention can be thermoformed and can optionally replace the container without thereby abandoning the scope of the protection of the present invention.
  • the container constituted by the thermoformed multilayer structure can be closed with a conventional film by thermal bonding.
  • the multilayer structure according to the invention fully achieves the intended aim and objects, since it allows to re-close containers after their first opening despite using a reduced amount of permanent adhesive.
  • Another advantage of the multilayer structure according to the invention is that it is also possible to use permanent adhesives having a reduced bonding force.
  • the materials employed, as well as the dimensions, may be any according to requirements and the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Laminated Bodies (AREA)
  • Cartons (AREA)

Claims (12)

  1. Mehrlagige Struktur zum Verschließen von mit einer Öffnung versehenen Behältern, mit wenigstens zwei Lagen, d. h. einer ersten Lage (2), die für eine thermische Haftung längs des gesamten Umfangs der Öffnung (3) des Behälters (4) geeignet ist, und einer zweiten Lage (5), die mit der ersten Lage (2) gekoppelt ist; wobei zwischen die erste Lage (2) und die zweite Lage (5) eine dritte Lage (6) aus einem dauerhaften Klebstoff eingefügt ist; wobei der Reißwiderstand der ersten Lage (2) geringer ist als die Haftkraft zwischen der ersten Lage (2) und der zweiten Lage (5), wo die dritte Lage (6) nicht vorhanden ist, und geringer ist als der Widerstand gegenüber einer Trennung der thermischen Haftung (10), die zwischen der ersten Lage (2) und dem Behälter (4) geschaffen werden soll; wobei der Widerstand gegenüber der Trennung der thermischen Haftung (10) größer ist als die Haftungs- und/oder Kohäsionskraft des dauerhaften Klebstoffs, so dass die erste Lage (2) während des ersten Öffnens des Behälters (4) zerreißt und die dritte Lage (6), die zum Wiederschließen des Behälters (4) verwendet werden kann, freilegt, dadurch gekennzeichnet, dass die dritte Lage (6) ausschließlich nur auf einen Teil des Bereichs (10) der ersten Lage (2), der dazu vorgesehen ist, mit dem Behälter (4) durch thermische Haftung gekoppelt zu werden, begrenzt ist.
  2. Mehrlagige Struktur nach Anspruch 1, dadurch gekennzeichnet, dass die erste Lage (2) und die zweite Lage (5) auch außerhalb jenes Bereichs der ersten Lage (2), der durch thermische Haftung mit dem Behälter (4) gekoppelt werden soll und durch die dritte Lage (6) belegt ist, miteinander gekoppelt sind.
  3. Mehrlagige Struktur nach Anspruch 1, dadurch gekennzeichnet, dass die Kohäsionskraft zwischen der dritten Lage (6) und der zweiten Lage (5) größer ist als die Kohäsionskraft zwischen der dritten Lage (6) und der ersten Lage (2).
  4. Mehrlagige Struktur nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Lage (5) auf ihrer Seite, die von der ersten Lage (2) wegweist, mit einer oder mehreren Lagen gekoppelt ist.
  5. Mehrlagige Struktur nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Lage (5) durch eine Schicht aus einem orientierten Polymer gebildet ist.
  6. Mehrlagige Struktur nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Lage (5) durch eine Sperrschicht gebildet ist.
  7. Mehrlagige Struktur nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Lage (5) durch eine wärmeformbare starre Schicht gebildet ist.
  8. Mehrlagige Struktur nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Lage (5) auf ihrer Seite, die von der ersten Lage (2) wegweist, mit einer wärmeformbaren starren Schicht gekoppelt ist.
  9. Verfahren zum Herstellen einer mehrlagigen Struktur nach einem oder mehreren der vorhergehenden Ansprüche, das darin besteht, die wenigstens zwei Lagen (2, 5), wovon eine für eine thermische Haftung geeignet ist, miteinander zu koppeln und zwischen die zwei Lagen (2, 5) die Lage (6) aus einem dauerhaften Klebstoff einzufügen, bevor sie gekoppelt werden, dadurch gekennzeichnet, dass diese Lage (6) ausschließlich nur auf einen Teil des Bereichs (10) der für die thermische Haftung geeigneten Lage, der dazu vorgesehen ist, mit einem Behälter (4) durch thermische Haftung gekoppelt zu werden, begrenzt ist.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass die zwei Lagen (2, 5) durch Heißkalandrieren miteinander gekoppelt sind.
  11. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass die zwei Lagen (2, 5) durch das als Extrusionsiaminierung bekannte Verfahren miteinander gekoppelt sind.
  12. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass die zwei Lagen (2, 5) dadurch gekoppelt werden, dass eine der zwei Lagen durch das als Extrusionsbeschichtung bekannte Verfahren auf der anderen der zwei Lagen (2, 5) hergestellt wird.
EP00108050A 1999-04-26 2000-04-20 Mehrschichtige Struktur für wiederverschliessbaren Behälterverschluss Expired - Lifetime EP1052186B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI990881 1999-04-26
IT1999MI000881A IT1312549B1 (it) 1999-04-26 1999-04-26 Struttura multistrato per la chiusura di contenitori, idonea allarealizzazione di contenitori richiudibili piu' volte dopo la prima

Publications (3)

Publication Number Publication Date
EP1052186A2 EP1052186A2 (de) 2000-11-15
EP1052186A3 EP1052186A3 (de) 2001-11-28
EP1052186B1 true EP1052186B1 (de) 2006-02-01

Family

ID=11382818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00108050A Expired - Lifetime EP1052186B1 (de) 1999-04-26 2000-04-20 Mehrschichtige Struktur für wiederverschliessbaren Behälterverschluss

Country Status (4)

Country Link
EP (1) EP1052186B1 (de)
AT (1) ATE316917T1 (de)
DE (1) DE60025771T2 (de)
IT (1) IT1312549B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT517369A1 (de) * 2015-07-15 2017-01-15 Medinoxx Gmbh Behälter und Verband aus einer Anzahl von Behältern
EP3511263B1 (de) * 2014-12-08 2023-01-18 Sonoco Development, Inc. Wiederverschliessbare flexible verpackung mit verstärktem umfang

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2380180B (en) * 2001-09-28 2005-05-11 Redbridge Holdings Ltd Container
DE602004013593D1 (de) * 2004-10-11 2008-06-19 Impress Group Bv Wiederverschliessbarer Foliendeckel
DE102005011500A1 (de) * 2005-03-12 2006-09-21 Henkel Kgaa Wiederverschließbare Verpackung
US10597202B2 (en) 2017-10-16 2020-03-24 Sonoco Development, Inc. Resealable lidding with patterned adhesive

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ226028A (en) * 1987-09-09 1990-06-26 Idemitsu Petrochemical Co Hermetically sealed package which can be resealed after opening
FR2669607B1 (fr) * 1990-11-26 1995-05-12 Torterotot Couvercle souple de securite refermable.
FR2686578A1 (fr) * 1992-01-27 1993-07-30 Alsacienne Aluminium Recipient, notamment pot ou barquette, comportant un opercule de refermeture pourvu d'une couche de vernis a pouvoir adherent permanent.
FR2741605B1 (fr) * 1995-11-29 1998-01-16 Soplaril Sa Structure d'obturation pour un contenant, contenant muni de cette structure et procede d'obturation du contenant
EP0905048A1 (de) * 1997-09-26 1999-03-31 Cryovac, Inc. Verbundfolie zum Wiederverschliessen von Behältern

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3511263B1 (de) * 2014-12-08 2023-01-18 Sonoco Development, Inc. Wiederverschliessbare flexible verpackung mit verstärktem umfang
AT517369A1 (de) * 2015-07-15 2017-01-15 Medinoxx Gmbh Behälter und Verband aus einer Anzahl von Behältern
AT517369B1 (de) * 2015-07-15 2019-07-15 Medinoxx Gmbh Behälter und Verband aus einer Anzahl von Behältern

Also Published As

Publication number Publication date
DE60025771D1 (de) 2006-04-13
EP1052186A3 (de) 2001-11-28
EP1052186A2 (de) 2000-11-15
IT1312549B1 (it) 2002-04-22
DE60025771T2 (de) 2006-07-20
ITMI990881A1 (it) 2000-10-26
ATE316917T1 (de) 2006-02-15

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