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EP1751025A1 - Flat-ended bag having an optimised splitting behaviour, and method for the production thereof - Google Patents

Flat-ended bag having an optimised splitting behaviour, and method for the production thereof

Info

Publication number
EP1751025A1
EP1751025A1 EP05744962A EP05744962A EP1751025A1 EP 1751025 A1 EP1751025 A1 EP 1751025A1 EP 05744962 A EP05744962 A EP 05744962A EP 05744962 A EP05744962 A EP 05744962A EP 1751025 A1 EP1751025 A1 EP 1751025A1
Authority
EP
European Patent Office
Prior art keywords
stand
pouch
stretched film
unidirectionally stretched
pouch according
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.)
Ceased
Application number
EP05744962A
Other languages
German (de)
French (fr)
Inventor
Christian Fenn-Barrabass
Walter Günter
Josef Müller
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.)
Huhtamaki Ronsberg Zweigniederlassung der Huhtamaki Deutschland GmbH and Co KG
Original Assignee
Huhtamaki Ronsberg Zweigniederlassung der Huhtamaki Deutschland 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34424598&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1751025(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Huhtamaki Ronsberg Zweigniederlassung der Huhtamaki Deutschland GmbH and Co KG filed Critical Huhtamaki Ronsberg Zweigniederlassung der Huhtamaki Deutschland GmbH and Co KG
Publication of EP1751025A1 publication Critical patent/EP1751025A1/en
Ceased legal-status Critical Current

Links

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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5805—Opening or contents-removing devices added or incorporated during package manufacture for tearing a side strip parallel and next to the edge, e.g. by means of a line of weakness
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/008—Standing pouches, i.e. "Standbeutel"

Definitions

  • the invention relates to a stand-up pouch and a method for its production according to the preambles of claims 1 and 13.
  • Stand-up pouches of the type mentioned are often used as a replacement for bags, but also bottles, cans and boxes, for packaging solid, liquid and pasty food and beverages as well as for everyday objects of all kinds.
  • Stand-up pouches have numerous advantages over the above-mentioned conventional packaging, firstly their light weight, their excellent durability combined with simple and inexpensive manufacture, and also their unproblematic disposability.
  • a stand-up pouch according to patent claim 1 and by a method for its production according to patent claim 13.
  • the object is achieved by a stand-up pouch with a stand-up pouch body and a stand-up pouch base, in particular a standing base, wherein at least the stand-up pouch body comprises at least one unidirectionally stretched film.
  • a stand-up pouch is understood to be any container formed from a film and / or a laminate, in particular also tubular pouches, with or without a separate or connected bottom and / or shoulder and / or lid part ,
  • An important point of the invention lies in the fact that in a unidirectionally stretched film the molecular chains forming the film are aligned and arranged essentially parallel in the stretching direction. As a result, a splittability of the stretched material parallel to the stretching direction is preferred over a direction angled to it, so that an oblique tearing by the aligned molecular chains is made significantly more difficult or impossible.
  • a further advantage of using a unidirectionally stretched film is that when splitting or tearing such a film parallel to the direction of stretching, no molecular chains have to be cut or torn from a molecular composite, since the molecular chains forming the material are not convoluted, but rather more or less smoothly next to one another are arranged. In this way, tearing such a unidirectionally stretched film parallel to the stretching direction requires a significantly reduced tear strength compared to conventional films, which is up to 50% to 60% below the tear strength that would be necessary for a conventional unstretched or bidirectionally stretched film.
  • a stand-up pouch which is made at least in a tear-open area from a unidirectionally stretched film, shows a tear-open behavior that is optimized compared to conventional stand-up pouches, with a smooth and uniform tear-open edge that follows the stretching direction. It is not to be feared with such a stand-up pouch that a tear runs uncontrollably over the entire stand-up pouch body, so that even stand-up pouches with a liquid content can be torn open without any problem, without fear of loss of the pouch content.
  • At least a part of the stand-up pouch body that can be torn open is formed from at least one unidirectionally stretched film.
  • the entire stand-up pouch body as well as the stand-up pouch stand or stand-up floor and the stand-up pouch cover or a shoulder part connected to them can also be produced from such a unidirectionally stretched film.
  • the unidirectionally stretched film is part of a laminate, which can have a barrier layer.
  • the unidirectional film has at least one polyolefin and / or an ester, with polyethylene and / or polypropylene and / or polyethylene terephthalate being preferred materials.
  • the optional barrier layer can consist, for example, of ethyl vinyl alcohol (EVOH) or a metal that is vapor-deposited on the laminate, or can be used as a film.
  • EVOH ethyl vinyl alcohol
  • Another barrier layer material includes, for example, glass-like substances that can contain SiO 2 .
  • the aforementioned materials can be used in the case of polyethylene and / or polypropylene pure, but also as a coextrudate and in conjunction with polyethylene terephthalate.
  • Aluminum is particularly suitable as a metal, although, depending on the application, other, preferably corrosion-resistant metals can also be used.
  • the barrier layer is arranged on at least one sealable layer and is preferably embedded, for example, between polyethylene terephthalate and polypropylene or polyethylene.
  • a multilayer laminate with a plurality of barrier layers can also be provided, preferably at least one of the outermost layers, in particular the outermost layer, being sealable.
  • the unidirectionally stretched film it can also be a matter of several unidirectionally stretched films — has a greater thickness in relation to further layers of the laminate.
  • the thickness of the unidirectionally stretched film is greater than that of the remaining further layers of the laminate, the thickness of a unidirectionally stretched film in the range from 10 ⁇ m to 200 ⁇ m, preferably in the range from 35 ⁇ m to 155 ⁇ m and particularly preferably in the range from 45 ⁇ m to 95 ⁇ m.
  • the stand-up pouch produced by means of the unidirectionally stretched film can be sterilized.
  • the film material Polypropylene is preferably provided, while for stand-up pouches that do not require sterilizability, polyethylene is a preferred, inexpensive and suitable material.
  • the stand-up pouch body is extruded in tubular form or produced as a lap or fin seal, which results in an optimized round shape of the stand or Tubular bag body contributes.
  • the stability of the stand-up pouch is largely ensured by at least one unidirectionally stretched film, the use of polyethylene terephthalate for mechanical stability and the use of polypropylene and / or polyethylene making a significant contribution to the dimensional stability.
  • a tear-open aid in particular a notch or the like, direction-defining weakening, is provided on the stand-up pouch body, for example on a sealing seam, by means of which a further tear-open of the stand-up pouch can be initiated parallel to a unidirectional stretching direction of the unidirectionally stretched film.
  • Such a tear-in or tear-open aid ensures that the tubular bag is torn in a targeted manner, the tear-off tip or notch pointing in the direction of the standing bag opening into the later opening seam or leading to the opening split of the unidirectionally stretched film.
  • the object according to the invention is achieved by a method for producing a stand-up pouch, which is characterized by the following steps:
  • a polyolefin and / or polyamide such as polyethylene or polypropylene or a coextrudate thereof is used to produce the thick film. It is also possible to use polyethylene terephthalate to produce the thick film.
  • steps a) to c) simultaneously or quasi-simultaneously, in particular in the course of coextrusion. It is possible here to apply a barrier layer directly or between layers of the laminate during the production of the laminate.
  • the laminate flat is also possible to produce the laminate flat as a film or as a fin- or lap-seal tube or, in particular, to extrude it and, if necessary, to seal it.
  • a stand-up pouch according to the invention is produced by first producing a thick film from polypropylene and from polyethylene terephthalate.
  • the polyethylene terephthalate and polypropylene thick film is stretched unidirectionally in the machine direction.
  • An aluminum layer with a layer thickness of 8 ⁇ m is then applied to the stretched polypropylene film, which has a layer thickness of 70 ⁇ m.
  • the aforementioned stretched polyethylene terephthalate layer which has a thickness of 12 ⁇ m, is in turn laminated onto the aluminum layer.
  • the laminate with barrier properties produced in this way is formed into a tubular shape by means of a lap-seal connection to form a tubular bag body, into which a bottom part with a barrier property, for example a deep-drawn bottom part, is sealed on the bottom side.
  • the tubular bag is sealed at the top using a fin-seal seal.
  • a notch is arranged in a lower limit of the fin-seal seal such that when the tubular bag is torn open, the top-side fin-seal secondary seal is removed and the tubular bag is opened.
  • the tubular bag By removing the fin-seal sealing on the head side, by means of which the tubular bag was held together at the head side in the closed state, the tubular bag can now unfold again in accordance with its round tubular body shape, so that the level of the bag contents now drops somewhat due to the widening of the bag , and spillage of the contents of the bag is also avoided.
  • a thick film of polypropylene is first produced, which is then unidirectionally stretched in the machine direction until a layer thickness of the stretched polypropylene film of 70 ⁇ m is reached.
  • Another thick film made of polyethylene terephthalate is also stretched unidirectionally in the machine direction until a layer thickness of the stretched polyethylene terephthalate film of about 12 ⁇ m is reached.
  • a flat laminate is produced from these two stretched foils together with an aluminum foil with a layer thickness of 8 ⁇ m arranged between them.
  • Foil blanks are cut from this laminate for the respective front and back sides of a stand-up pouch body. The respective outer edges of the front and back sides of the laminate are sealed together to a width of approx. 3 mm.
  • the bottom of the stand-up pouch is made by sealing a V-shaped blank.
  • the stand-up pouch is closed at the top after filling, for example by means of a fin-seal seal. Furthermore, a tear-off aid in the form of a notch is attached to the side fin-seal seal, by means of which a further tearing open of the stand-up pouch can be initiated.
  • the tear aid can be provided on the stand-up pouch on one or both sides.
  • an embossing can be provided adjacent to the tear line predefined by means of the tear-open notch and the direction of stretching.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Wrappers (AREA)
  • Packages (AREA)
  • Making Paper Articles (AREA)

Abstract

The invention relates to a flat-ended bag comprising a body and a bottom, especially a flat bottom, at least the body of said bag comprising at least one unidirectionally stretched film. The invention also relates to a method for producing one such flat-ended bag.

Description

"Standbeutel mit optimiertem Aufreißverhalten und Verfahren zu seiner Herstellung " "Stand-up pouch with optimized tear behavior and process for its manufacture"
B e s c h r e i b u n gDescription
Die Erfindung betrifft einen Standbeutel sowie ein Verfahren zu seiner Herstellung gemäß den Oberbegriffen der Patentansprüche 1 und 13.The invention relates to a stand-up pouch and a method for its production according to the preambles of claims 1 and 13.
Standbeutel der genannten Art werden vielfach als Ersatz für Tüten, aber auch Flaschen, Dosen und Kartons, zur Verpackung von festen, flüssigen und pastösen Nahrungs- und Genußmitteln sowie für Gebrauchsgegenstände aller Art verwendet.Stand-up pouches of the type mentioned are often used as a replacement for bags, but also bottles, cans and boxes, for packaging solid, liquid and pasty food and beverages as well as for everyday objects of all kinds.
Standbeutel weisen gegenüber den vorgenannten herkömmlichen Verpackungen zahlreiche Vorteile auf, wobei zum einen ihr geringes Gewicht, ihre ausgezeichnete Haltbarkeit bei gleichzeitig einfacher und kostengünstiger Herstellbarkeit als auch ihre unproblematische Entsorgbarkeit genannt seien.Stand-up pouches have numerous advantages over the above-mentioned conventional packaging, firstly their light weight, their excellent durability combined with simple and inexpensive manufacture, and also their unproblematic disposability.
Als nachteilig bei der Verwendung von Standbeuteln hat sich jedoch deren oft schlechtes Öffnungsverhalten erwiesen, wobei nach einem Einreißen des Standbeutels, beispielsweise mittels einer Kerbe, der Standbeutel oft unkontrolliert aufgerissen ist, was zu einer Zerstörung des Standbeutels sowie zu einem Verschütten des Beutelinhalts führte. Eine Weiterverwendung des geöffneten Standbeutels war völlig unmöglich.However, their often poor opening behavior has proven to be disadvantageous when using stand-up pouches, whereby after the stand-up pouch tears, for example by means of a notch, the stand-up pouch is often torn open in an uncontrolled manner, which leads to destruction of the stand-up pouch and spilling of the contents of the pouch. It was completely impossible to continue using the opened stand-up pouch.
Als Lösung für dieses Problem wurden zahlreiche Hilfsmittel, wie beispielsweise Aufreißfäden, Perforationen oder die Zuhilfenahme von Scheren oder Messern angewendet bzw. empfohlen, was jedoch wiederum aufwendige und teure Herstellungs- und Produktionsverfahren erforderte oder zusätzliches, nicht immer vorhandenes Zusatzwerkzeug notwendig machte.Numerous aids, such as tear threads, perforations or the use of scissors or knives, have been used to solve this problem. recommended, but this in turn required complex and expensive manufacturing and production processes or made additional, not always available additional tools necessary.
Insofern besteht ein hoher Bedarf an einem Standbeutel, der auf einfache Weise ohne eine völlige Zerstörung oder ein unkontrolliertes Aufreißen des gesamten Standbeutels geöffnet werden kann und für eine Weiterverwendung auch nach einem Offnen zur Verfügung steht.In this respect, there is a great need for a stand-up pouch that can be opened in a simple manner without completely destroying or tearing open the entire stand-up pouch in an uncontrolled manner and is available for further use even after opening.
Deshalb ist es die Aufgabe der Erfindung, einen einfachen, kostengünstig herzustellenden Standbeutel mit vorgenannten Eigenschaften unter Vermeidung der Nachteile des Standes der Technik zur Verfügung zu stellen, der neben einer vielseitigen Verwendbarkeit aus einem Material mit hoher Lebensdauer und unproblematischer Entsorgbarkeit hergestellt ist.It is therefore the object of the invention to provide a simple, inexpensive to produce stand-up pouch with the aforementioned properties while avoiding the disadvantages of the prior art, which, in addition to being versatile, is made from a material with a long service life and unproblematic disposability.
Diese Aufgabe wird durch einen Standbeutel gemäß Patentanspruch 1 sowie durch ein Verfahren zu seiner Herstellung gemäß Patentanspruch 13 gelöst. Insbesondere wird die Aufgabe durch einen Standbeutel mit einem Standbeutelkörper und einem Standbeutelboden, insbesondere Stehboden, gelöst, wobei wenigstens der Standbeutelkörper zumindest eine unidirektional gereckte Folie umfaßt.This object is achieved by a stand-up pouch according to patent claim 1 and by a method for its production according to patent claim 13. In particular, the object is achieved by a stand-up pouch with a stand-up pouch body and a stand-up pouch base, in particular a standing base, wherein at least the stand-up pouch body comprises at least one unidirectionally stretched film.
In diesem Zusammenhang sei erwähnt, daß im Rahmen dieser Erfindung als Standbeutel jeder aus einer Folie und/oder einem Laminat gebildete Behälter, insbesondere auch Schlauchbeutel, mit oder ohne separatem oder verbundenem, Boden- und/oder Schulter- und/oder Deckelteil zu verstehen ist.In this context, it should be mentioned that in the context of this invention, a stand-up pouch is understood to be any container formed from a film and / or a laminate, in particular also tubular pouches, with or without a separate or connected bottom and / or shoulder and / or lid part ,
Ein wesentlicher Punkt der Erfindung liegt darin, daß in einer unidirektional gereckten Folie die die Folie bildenden Molekülketten ausgerichtet und in Reckrichtung im wesentlichen parallel angeordnet sind. Hierdurch bedingt ist eine Spaltbarkeit des gereckten Materials parallel zur Reckrichtung gegenüber einer dazu winkligen Richtung bevorzugt, so daß ein schräges Einreißen durch die ausgerichteten Molekülketten deutlich erschwert bis unmöglich gemacht wird. Ein weiterer Vorteil der Verwendung einer unidirektional gereckten Folie besteht darin, daß beim Spalten bzw. Aufreißen einer solchen Folie parallel zur Reckrichtung keine Molekülketten durchtrennt oder aus einem Molekülverbund gerissen werden müssen, da die das Material bildenden Molekülketten nicht verknäult, sondern mehr oder weniger glatt nebeneinander angeordnet sind. Auf diese Weise ist zum Zerreißen einer solchermaßen unidirektional gereckten Folie parallel zur Reckrichtung eine gegenüber herkömmlichen Folien deutlich verringerte Reißkraft erforderlich, die bis zu 50% bis 60% unterhalb der Reißkraft liegt, die für eine herkömmliche ungereckte oder bidirektional gereckte Folie notwendig wäre.An important point of the invention lies in the fact that in a unidirectionally stretched film the molecular chains forming the film are aligned and arranged essentially parallel in the stretching direction. As a result, a splittability of the stretched material parallel to the stretching direction is preferred over a direction angled to it, so that an oblique tearing by the aligned molecular chains is made significantly more difficult or impossible. A further advantage of using a unidirectionally stretched film is that when splitting or tearing such a film parallel to the direction of stretching, no molecular chains have to be cut or torn from a molecular composite, since the molecular chains forming the material are not convoluted, but rather more or less smoothly next to one another are arranged. In this way, tearing such a unidirectionally stretched film parallel to the stretching direction requires a significantly reduced tear strength compared to conventional films, which is up to 50% to 60% below the tear strength that would be necessary for a conventional unstretched or bidirectionally stretched film.
Insofern zeigt ein Standbeutel, der zumindest in einem Aufreißbereich aus einer unidirektional gereckten Folie hergestellt ist, ein gegenüber herkömmlichen Standbeuteln optimiertes Aufreißverhalten mit einer glatten und gleichförmigen, der Reckrichtung folgenden Aufreißkante. Es ist bei einem solchen Standbeutel nicht zu befürchten, daß ein Riß unkontrolliert über den gesamten Standbeutelkörper verläuft, so daß auch Standbeutel mit einem flüssigen Inhalt unproblematisch aufgerissen werden können, ohne daß ein Verlust des Beutelinhalts befürchtet werden muß.In this respect, a stand-up pouch, which is made at least in a tear-open area from a unidirectionally stretched film, shows a tear-open behavior that is optimized compared to conventional stand-up pouches, with a smooth and uniform tear-open edge that follows the stretching direction. It is not to be feared with such a stand-up pouch that a tear runs uncontrollably over the entire stand-up pouch body, so that even stand-up pouches with a liquid content can be torn open without any problem, without fear of loss of the pouch content.
Erfindungsgemäß ist, wie vorerwähnt, zumindest ein aufzureißender Teil des Standbeutelkörpers aus zumindest einer unidirektional gereckten Folie gebildet. Es sei jedoch der Vollständigkeit halber erwähnt, daß auch der gesamte Standbeutelkörper sowie der Standbeutel-Stand- bzw. Stehboden und der Standbeutel-Deckel bzw. ein an diesen verbundenes Schulterteil aus einer solchermaßen unidirektional gereckten Folie hergestellt sein können.According to the invention, as mentioned above, at least a part of the stand-up pouch body that can be torn open is formed from at least one unidirectionally stretched film. For the sake of completeness, however, it should be mentioned that the entire stand-up pouch body as well as the stand-up pouch stand or stand-up floor and the stand-up pouch cover or a shoulder part connected to them can also be produced from such a unidirectionally stretched film.
Gemäß einer Aus führungs form ist die unidirektional gereckte Folie Teil eines Laminats, das eine Barriereschicht aufweisen kann. Die unidirektionale Folie weist erfindungsgemäß wenigstens ein Polyolefin und/oder einen Ester auf, wobei Polyethylen und/oder Polypropylen und/oder Polyethylenterephthalat bevorzugte Materialien sind. Die optionale Barriereschicht kann beispielsweise aus Ethylvinylalkohol (EVOH) oder einem Metall bestehen, das auf das Laminat aufgedampft ist, oder als Folie Verwendung findet. Ein weiteres Barriereschicht-Material umfaßt beispielsweise glasartige Substanzen, die Si02- haltig sein können. Die vorerwähnten Materialien können im Falle von Polyethylen und/oder Polypropylen rein, aber auch als Coextrudat sowie in Verbindung mit Polyethylenterephthalat vorliegen.According to one embodiment, the unidirectionally stretched film is part of a laminate, which can have a barrier layer. According to the invention, the unidirectional film has at least one polyolefin and / or an ester, with polyethylene and / or polypropylene and / or polyethylene terephthalate being preferred materials. The optional barrier layer can consist, for example, of ethyl vinyl alcohol (EVOH) or a metal that is vapor-deposited on the laminate, or can be used as a film. Another barrier layer material includes, for example, glass-like substances that can contain SiO 2 . The aforementioned materials can be used in the case of polyethylene and / or polypropylene pure, but also as a coextrudate and in conjunction with polyethylene terephthalate.
Als Metall kommt insbesondere Aluminium in Betracht, wobei auch, je nach Anwendung, andere, vorzugsweise korrosionsbeständige Metalle Verwendung finden können.Aluminum is particularly suitable as a metal, although, depending on the application, other, preferably corrosion-resistant metals can also be used.
Erfindungsgemäß ist die Barriereschicht an zumindest einer siegelbaren Schicht angeordnet und vorzugsweise, beispielsweise zwischen Polyethylenterephthalat und Polypropylen oder Polyethylen eingebettet. Selbstverständlich kann auch ein Mehrschicht -Laminat mit mehreren Barriereschichten vorgesehen sein, wobei vorzugsweise zumindest eine der äußersten Schichten, insbesondere die äußerste Schicht, siegelbar ist.According to the invention, the barrier layer is arranged on at least one sealable layer and is preferably embedded, for example, between polyethylene terephthalate and polypropylene or polyethylene. Of course, a multilayer laminate with a plurality of barrier layers can also be provided, preferably at least one of the outermost layers, in particular the outermost layer, being sealable.
Erfindungsgemäß weist die unidirektional gereckte Folie - es kann sich auch um mehrere unidirektional gereckte Folien handeln - in bezug auf weitere Schichten des Laminats eine größere Dicke auf.According to the invention, the unidirectionally stretched film — it can also be a matter of several unidirectionally stretched films — has a greater thickness in relation to further layers of the laminate.
Des weiteren liegt es im Rahmen der Erfindung, daß die Dicke der unidirektional gereckten Folie größer ist als diejenige der verbleibenden weiteren Schichten des Laminats, wobei die Dicke einer unidirektional gereckten Folie im Bereich von 10 μm bis 200 μm, bevorzugt im Bereich von 35 μm bis 155 μm und besonders bevorzugt im Bereich von 45 μm bis 95 μm liegt.Furthermore, it is within the scope of the invention that the thickness of the unidirectionally stretched film is greater than that of the remaining further layers of the laminate, the thickness of a unidirectionally stretched film in the range from 10 μm to 200 μm, preferably in the range from 35 μm to 155 μm and particularly preferably in the range from 45 μm to 95 μm.
Auf diese Weise ist gewährleistet, daß das Aufreißverhalten des Standbeutels maßgeblich durch die eine oder mehrere unidirektional gereckte(n) Folie(n) eindeutig definiert ist.This ensures that the tear-open behavior of the stand-up pouch is significantly defined by the one or more unidirectionally stretched film (s).
Es sei an dieser Stelle vermerkt, daß zur Herstellung des erfindungsgemäßen Standbeutels auch Granulate verwendbar sind, die ein sehr gutes Reißverhalten sowie einen hohen Schmelzindex und eine entsprechend der Aufreißrichtung ausgerichtete Molekülstruktur aufweisen.At this point it should be noted that for the production of the stand-up pouch according to the invention it is also possible to use granules which have a very good tear behavior as well as a high melt index and a molecular structure oriented in accordance with the tear direction.
Gemäß einer bevorzugten Ausführungsform ist der mittels der unidirektional gereckten Folie hergestellte Standbeutel sterilisierbar. In diesem Fall ist als Folienmaterial vor- zugsweise Polypropylen vorgesehen, während für Standbeutel, die eine Sterilisierbarkeit nicht erfordern, Polyethylen ein bevorzugtes, kostengünstiges und geeignetes Material ist.According to a preferred embodiment, the stand-up pouch produced by means of the unidirectionally stretched film can be sterilized. In this case, the film material Polypropylene is preferably provided, while for stand-up pouches that do not require sterilizability, polyethylene is a preferred, inexpensive and suitable material.
Gemäß einer Ausführungsform ist der Standbeutelkörper schlauchförmig extrudiert oder als lap- oder als fin-seal hergestellt, was zu einer optimierten runden Gestalt des Standbzw. Schlauchbeutelkörpers beiträgt.According to one embodiment, the stand-up pouch body is extruded in tubular form or produced as a lap or fin seal, which results in an optimized round shape of the stand or Tubular bag body contributes.
Die Stabilität des Standbeutels ist maßgeblich durch zumindest eine unidirektional gereckte Folie gewährleistet, wobei zur mechanischen Stabilität die Verwendung von Polyethylenterephthalat und zur Formstabilität die Verwendung von Polypropylen und/oder Polyethylen maßgeblich ihren Beitrag leisten.The stability of the stand-up pouch is largely ensured by at least one unidirectionally stretched film, the use of polyethylene terephthalate for mechanical stability and the use of polypropylene and / or polyethylene making a significant contribution to the dimensional stability.
Gemäß einer besonders bevorzugten Ausfuhrungsform der Erfindung ist am Standbeutelkörper, beispielsweise an einer Siegelnaht, eine Einreißhilfe, insbesondere eine Kerbe oder dgl. richtungsdefinierende Schwächung vorgesehen, mittels derer ein weiteres Aufreißen des Standbeutels parallel zu einer unidirektionalen Reckrichtung der unidirektional gereckten Folie initiierbar ist.According to a particularly preferred embodiment of the invention, a tear-open aid, in particular a notch or the like, direction-defining weakening, is provided on the stand-up pouch body, for example on a sealing seam, by means of which a further tear-open of the stand-up pouch can be initiated parallel to a unidirectional stretching direction of the unidirectionally stretched film.
Mittels einer derartigen Ein- bzw. Aufreißhilfe ist ein gezieltes Einreißen des Schlauch- beutes sichergestellt, wobei die in Richtung Standbeutel weisende Einreißspitze bzw. Kerbe in die spätere Öffnungsnaht mündet bzw. zu der Öffnungsspaltung der unidirektional gereckten Folie führt.Such a tear-in or tear-open aid ensures that the tubular bag is torn in a targeted manner, the tear-off tip or notch pointing in the direction of the standing bag opening into the later opening seam or leading to the opening split of the unidirectionally stretched film.
Prinzipiell sei jedoch erwähnt, daß eine derartige Einreißhilfe nicht zwingend notwendig ist, da die zum Offnen des Standbeutels erforderliche Reißkraft gegenüber herkömmlichen Standbeuteln deutlich reduziert ist und beispielsweise auch eine Kerbung mittels eines Fingernagels oder eines anderen kantigen Gegenstands in Abhängigkeit der Folienbzw. Laminatdicke ein ordentliches und sauberes Aufreißen des Standbeutels mit einer klar definierten geradlinigen Rißlinie ermöglicht.In principle, however, it should be mentioned that such a tearing aid is not absolutely necessary, since the tearing force required to open the stand-up pouch is significantly reduced compared to conventional stand-up pouches and, for example, notching by means of a fingernail or another angular object depending on the film or. Laminate thickness allows for a tidy and clean opening of the stand-up pouch with a clearly defined straight tear line.
Somit sind Maßnahmen nach dem Stand der Technik zum erleichterten Aufreißen eines Standbeutels, wie komplizierte Einbringungen von Reißfäden oder -bändern oder Perforationen, hier sei an Lochungen oder Laserperforationen mit den damit einhergehenden Nachteilen gedacht, in oder an dem Laminat oder der Folie nicht mehr notwendig. Somit ist bei Herstellung des erfindungsgemäßen Standbeutels eine deutliche Reduzierung der Herstellungs- und Materialkosten möglich, da herkömmliche und äußerst kostengünstige Materialien wie Polyolefine und/oder Polyamide, wie beispielsweise Polypropylen, Polyethylen oder Polyethylenterephthalat, vollkommen ausreichend sind, um eine erfindungsgemäße gereckte Folie und daraus einen entsprechenden Standbeutel mit oder ohne Barriereschichten herzustellen.Thus, measures according to the prior art for facilitating the tearing open of a stand-up pouch, such as complicated insertion of tear threads or tapes or perforations, here are perforations or laser perforations with the associated ones Disadvantages thought, in or on the laminate or the film no longer necessary. Thus, a significant reduction in manufacturing and material costs is possible in the manufacture of the stand-up pouch according to the invention, since conventional and extremely inexpensive materials such as polyolefins and / or polyamides, such as, for example, polypropylene, polyethylene or polyethylene terephthalate, are completely sufficient to form an inventive stretched film and one produce appropriate stand-up pouches with or without barrier layers.
Des weiteren wird die erfindungsgemäße Aufgabe durch ein Verfahren zum Herstellen eines Standbeutels gelöst, das durch die folgenden Schritte gekennzeichnet ist:Furthermore, the object according to the invention is achieved by a method for producing a stand-up pouch, which is characterized by the following steps:
a) Herstellen einer Dickfolie; b) Recken der Dickfolie in unidirektionaler Richtung; c) Laminieren der unidirektional gereckten Folie; d) Formen des Standbeutels; e) optionales Anbringen einer richtungsdefinierenden Schwächung, insbesondere Einreißhilfe am Standbeutel, wobei ein Einreißen des Standbeutels parallel zu einer unidirektionalen Reckrichtung der unidirektional gereckten Folie ermöglicht wird.a) making a thick film; b) stretching the thick film in the unidirectional direction; c) laminating the unidirectionally stretched film; d) shapes of the stand-up pouch; e) optional attachment of a direction-defining weakening, in particular a tear aid on the stand-up pouch, wherein the stand-up pouch can be torn parallel to a unidirectional stretching direction of the unidirectionally stretched film.
Zum Herstellen der Dickfolie wird ein Polyolefin und/oder Polyamid, wie beispielsweise Polyethylen oder Polypropylen oder ein Coextrudat davon verwendet. Ebenso ist es möglich, Polyethylenterephthalat zum Herstellen der Dickfolie zu verwenden.A polyolefin and / or polyamide such as polyethylene or polypropylene or a coextrudate thereof is used to produce the thick film. It is also possible to use polyethylene terephthalate to produce the thick film.
Gemäß einer Ausführungsvariante ist es möglich, die Schritte a) bis c) gleichzeitig oder quasi-gleichzeitig, insbesondere im Zuge einer Coextrustion durchzuführen. Hierbei ist es möglich, unmittelbar während der Herstellung des Laminats eine Barriereschicht auf- oder zwischen Schichten des Laminats einzubringen.According to one embodiment variant, it is possible to carry out steps a) to c) simultaneously or quasi-simultaneously, in particular in the course of coextrusion. It is possible here to apply a barrier layer directly or between layers of the laminate during the production of the laminate.
Ebenso ist es möglich, das Laminat flächig als Folie oder als fin- oder lap-seal-Schlauch herzustellen bzw. insbesondere zu extrudieren und ggf. zu versiegeln.It is also possible to produce the laminate flat as a film or as a fin- or lap-seal tube or, in particular, to extrude it and, if necessary, to seal it.
Weitere Ausführungsformen der Erfindung ergeben sich aus den Unteransprüchen. Nachfolgend wird die Erfindung anhand zweier Ausführungsbeispiele beschrieben.Further embodiments of the invention result from the subclaims. The invention is described below using two exemplary embodiments.
Ein erfindungsgemäßer Standbeutel wird hergestellt, indem zunächst aus Polypropylen und aus Polyethylenterephthalat jeweils eine Dickfolie hergestellt wird. Die Polyethylenterephthalat- und Polypropylen-Dickfolie wird in Maschinenrichtung unidirektional gereckt. Anschließend wird auf die gereckte Polypropylen-Folie, die eine Schichtdicke von 70 μm aufweist, eine Aluminiumschicht mit einer Schichtdicke von 8 μm aufgebracht. Auf die Aluminiumschicht wird wiederum die vorerwähnte gereckte Polyethylenterephthalat - schicht auflaminiert, die eine Dicke von 12 μm hat.A stand-up pouch according to the invention is produced by first producing a thick film from polypropylene and from polyethylene terephthalate. The polyethylene terephthalate and polypropylene thick film is stretched unidirectionally in the machine direction. An aluminum layer with a layer thickness of 8 μm is then applied to the stretched polypropylene film, which has a layer thickness of 70 μm. The aforementioned stretched polyethylene terephthalate layer, which has a thickness of 12 μm, is in turn laminated onto the aluminum layer.
Das auf diese Weise erzeugte Laminat mit Barriereeigenschaft wird schlauchförmig mittels einer lap-seal-Verbindung zu einem Schlauchbeutelkörper geformt, in den bodenseitig ein Bodenteil mit Barriereeigenschaft, beispielsweise ein tiefgezogenes Bodenteil, eingesiegelt wird. Kopfseitig wir der Schlauchbeutel mittels einer fin-seal- Versiegelung verschlossen. Als Aufreißhilfe ist in einer unteren Begrenzung der fin-seal-Versiegelung eine Kerbe derart angeordnet, daß bei einem Aufreißen des Schlauchbeutels ein Entfernen der kopfseitigen fin-seal-Nersiegelung stattfindet, und eine Öffnung des Schlauchbeutels stattfindet. Durch das Entfernen der kopfseitigen fin-seal-Nersiegelung, durch die der Schlauchbeutel in geschlossenem Zustand kopfseitig zusammengehalten wurde, kann sich der Schlauchbeutel nunmehr wieder entsprechend seiner runden Schlauchbeutelkörperform entfalten, so daß das Niveau des Beutelinhalts nunmehr durch die Verbreiterung des Beutels etwas nach unten absinkt, und ein Verschütten des Beutelinhaltes zusätzlich auch dadurch vermieden wird.The laminate with barrier properties produced in this way is formed into a tubular shape by means of a lap-seal connection to form a tubular bag body, into which a bottom part with a barrier property, for example a deep-drawn bottom part, is sealed on the bottom side. The tubular bag is sealed at the top using a fin-seal seal. As a tear-open aid, a notch is arranged in a lower limit of the fin-seal seal such that when the tubular bag is torn open, the top-side fin-seal secondary seal is removed and the tubular bag is opened. By removing the fin-seal sealing on the head side, by means of which the tubular bag was held together at the head side in the closed state, the tubular bag can now unfold again in accordance with its round tubular body shape, so that the level of the bag contents now drops somewhat due to the widening of the bag , and spillage of the contents of the bag is also avoided.
Gemäß einem zweiten Ausführungsbeispiel wird zunächst eine Dickfolie aus Polypropylen hergestellt, die anschließend in Maschinenlaufrichtung unidirektional gereckt wird, bis eine Schichtdicke der gereckten Polypropylen-Folie von 70 μm erreicht ist. Eine weitere Dickfolie aus Polyethylenterephthalat wird ebenfalls in Maschinenrichtung unidirektional gereckt, bis eine Schichtdicke der gereckten Polyethylenterephthalat-Folie von etwa 12 μm erreicht ist. Aus diesen beiden gereckten Folien zusammen mit einer zwischen diesen angeordneten Aluminiumfolie mit einer Schichtdicke von 8 μm wird ein flächiges Laminat hergestellt. Aus diesem Laminat werden Folienzuschnitte für jeweilige Vorder- und Rückseiten eines Standbeutelkörpers zugeschnitten. Die jeweiligen Außenkanten der Vorder- und Rückseiten des Laminats werden auf einer Breite von ca. 3 mm miteinander versiegelt. Der Boden des Standbeutels wird durch das Einsiegeln eines V-faltenförmigen Zuschnitts gefertigt.According to a second exemplary embodiment, a thick film of polypropylene is first produced, which is then unidirectionally stretched in the machine direction until a layer thickness of the stretched polypropylene film of 70 μm is reached. Another thick film made of polyethylene terephthalate is also stretched unidirectionally in the machine direction until a layer thickness of the stretched polyethylene terephthalate film of about 12 μm is reached. A flat laminate is produced from these two stretched foils together with an aluminum foil with a layer thickness of 8 μm arranged between them. Foil blanks are cut from this laminate for the respective front and back sides of a stand-up pouch body. The respective outer edges of the front and back sides of the laminate are sealed together to a width of approx. 3 mm. The bottom of the stand-up pouch is made by sealing a V-shaped blank.
Kopfseitig wird der Standbeutel nach einem Befüllen beispielsweise mittels einer fin-seal- Versiegelung verschlossen. Des weiteren wird an der seitlichen fin-seal-Versiegelung eine Einreißhilfe in Form einer Kerbe angebracht, mittels derer ein weiteres Aufreißen des Standbeutels initiiert werden kann.The stand-up pouch is closed at the top after filling, for example by means of a fin-seal seal. Furthermore, a tear-off aid in the form of a notch is attached to the side fin-seal seal, by means of which a further tearing open of the stand-up pouch can be initiated.
Die Einreißhilfe kann ein-, aber auch beidseitig an dem Standbeutel vorgesehen sein.The tear aid can be provided on the stand-up pouch on one or both sides.
Wenn der Standbeutel nun geöffnet werden soll, so wird ein seitliches Aufreißen des Standbeutels an der Kerbe initiiert, wobei durch die unidirektional gereckten Folien ein richtungsdefiniertes Aufreißen parallel zum Standboden gewährleistet ist, das gegenüber dem Aufreißen eines herkömmlichen Standbeutels eine deutlich verringerte Weiterreiß- kraft erfordert.If the stand-up pouch is now to be opened, a side opening of the stand-up pouch is initiated at the notch, whereby the unidirectionally stretched foils guarantee a direction-defined tearing open parallel to the stand base, which requires a significantly reduced tear force compared to the opening of a conventional stand-up pouch.
Sofern gewünscht, kann benachbart zu der mittels der Aufreißkerbe und der Reckrichtung vordefinierten Aufreißlinie eine Prägung vorgesehen sein.If desired, an embossing can be provided adjacent to the tear line predefined by means of the tear-open notch and the direction of stretching.
An dieser Stelle sei darauf hingewiesen, daß alle oben beschriebenen Teile für sich alleine gesehen und in jeder Kombination als erfindungswesentlich beansprucht werden. Abänderungen hiervon sind dem Fachmann geläufig. At this point, it should be pointed out that all the parts described above are seen on their own and in any combination are claimed as essential to the invention. Modifications are familiar to the person skilled in the art.

Claims

Patentansprüche claims
1. Standbeutel mit einem Standbeutelkörper und einem Standbeutelboden, insbesondere Stehboden, dadurch gekennzeichnet, daß wenigstens der Standbeutelkörper zumindest eine unidirektional gereckte Folie umfaßt.1. Stand-up pouch with a stand-up pouch body and a stand-up pouch base, in particular standing-up base, characterized in that at least the stand-up pouch body comprises at least one unidirectionally stretched film.
2. Standbeutel nach Anspruch 1, dadurch gekennzeichnet, daß die unidirektional gereckte Folie Teil eines Laminats ist.2. Stand-up pouch according to claim 1, characterized in that the unidirectionally stretched film is part of a laminate.
3. Standbeutel nach Anspruch 2, dadurch gekennzeichnet, daß die unidirektional gereckte Folie in Bezug auf weitere Schichten des Laminats eine größte Dicke aufweist.3. Stand-up pouch according to claim 2, characterized in that the unidirectionally stretched film has a greatest thickness with respect to further layers of the laminate.
4. Standbeutel nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Dicke der unidirektional gereckten Folie größer ist als diejenige der verbleibenden weiteren Schichten des Laminats. 4. Stand-up pouch according to claim 2 or 3, characterized in that the thickness of the unidirectionally stretched film is greater than that of the remaining further layers of the laminate.
5. Standbeutel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die zumindest eine unidirektional gereckte Folie wenigstens ein Polyolefin und/oder Polyamid und/oder einen Ester, insbesondere Polyethylen und/oder Polypropylen und/oder Polyethylenterephthalat, aufweist.5. Stand-up pouch according to one of the preceding claims, characterized in that the at least one unidirectionally stretched film has at least one polyolefin and / or polyamide and / or an ester, in particular polyethylene and / or polypropylene and / or polyethylene terephthalate.
6. Standbeutel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine Stabilität des Standbeutels maßgeblich durch zumindest eine unidirektional gereckte Folie gewährleistet ist.6. Stand-up pouch according to one of the preceding claims, characterized in that a stability of the stand-up pouch is largely ensured by at least one unidirectionally stretched film.
7. Standbeutel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die unidirektional gereckte Folie eine Dicke im Bereich von 10 μm bis 200 μm, bevorzugt im Bereich von 35 μm bis 155 μm und besonders bevorzugt im Bereich von 45 μm bis 95 μm aufweist.7. Stand-up pouch according to one of the preceding claims, characterized in that the unidirectionally stretched film has a thickness in the range from 10 μm to 200 μm, preferably in the range from 35 μm to 155 μm and particularly preferably in the range from 45 μm to 95 μm.
8. Standbeutel nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß das Laminat wenigstens eine Barriereschicht aufweist.8. Stand-up pouch according to one of claims 2 to 7, characterized in that the laminate has at least one barrier layer.
9. Standbeutel nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß die Barriereschicht Ethylvinylalkohol (EVOH) und/oder Si02 und/oder Metall, insbesondere Aluminium, umfaßt.9. Stand-up pouch according to one of claims 2 to 7, characterized in that the barrier layer comprises ethyl vinyl alcohol (EVOH) and / or Si02 and / or metal, in particular aluminum.
10. Standbeutel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Standbeutel sterilisierbar ist.10. Stand-up pouch according to one of the preceding claims, characterized in that the stand-up pouch can be sterilized.
11. Standbeutel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Standbeutelkörper schlau chförmig extrudiert oder mittels lap-seal- und/oder fin-seal-Versiegelung hergestellt ist.11. Stand-up pouch according to one of the preceding claims, characterized in that the body of the stand-up pouch is extruded cunningly or is produced by means of lap-seal and / or fin-seal sealing.
12. Standbeutel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine Einreißhilfe, insbesondere eine Kerbe oder dergleichen richtungsdefinierende Schwächung, am Standbeutel vorgesehen ist, mittels derer ein Weiteraufreißen des Standbeutels parallel zu einer unidirektionalen Reckrichtung der unidirektional gereckten Folie initiierbar ist.12. Stand-up pouch according to one of the preceding claims, characterized in that a tearing aid, in particular a notch or the like direction-defining weakening, is provided on the stand-up pouch, by means of which a tearing open of the stand-up pouch can be initiated parallel to a unidirectional stretching direction of the unidirectionally stretched film.
13. Verfahren zum Herstellen eines Standbeutels gemäß einem der Ansprüche 1 bis 12, gekennzeichnet durch folgende Schritte: a) Herstellen einer Dickfolie; b) Recken der Dickfolie in unidirektionaler Richtung; c) Laminieren der unidirektional gereckten Folie; d) Formen des Standbeutels; e) Anbringen einer richtungsdefinierenden Schwächung, insbesondere Einreißhüfe am Standbeutel, wobei ein Einreißen des Standbeutels parallel zu einer unidirektionalen Reckrichtung der unidirektional gereckten Folie ermöglicht wird.13. A method for producing a stand-up pouch according to one of claims 1 to 12, characterized by the following steps: a) producing a thick film; b) stretching the thick film in the unidirectional direction; c) laminating the unidirectionally stretched film; d) shapes of the stand-up pouch; e) attaching a direction-defining weakening, in particular tearing aids, to the stand-up pouch, wherein the stand-up pouch can be torn parallel to a unidirectional stretching direction of the unidirectionally stretched film.
14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, daß die Schritte a) bis c) gleichzeitig oder quasi-gleichzeitig, insbesondere im Zuge einer Coextrusion durchgeführt werden. 14. The method according to claim 13, characterized in that steps a) to c) are carried out simultaneously or quasi-simultaneously, in particular in the course of a coextrusion.
EP05744962A 2004-05-17 2005-05-13 Flat-ended bag having an optimised splitting behaviour, and method for the production thereof Ceased EP1751025A1 (en)

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DE102004024348 2004-05-17
DE102004026980A DE102004026980B4 (en) 2004-05-17 2004-06-03 Stand-up pouches with optimized tear properties and process for its production
PCT/EP2005/005290 WO2005113370A1 (en) 2004-05-17 2005-05-13 Flat-ended bag having an optimised splitting behaviour, and method for the production thereof

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DE202005021704U1 (en) 2009-10-15
NZ551038A (en) 2009-10-30
RU2376227C2 (en) 2009-12-20
MXPA06013265A (en) 2007-04-16
CA2565916A1 (en) 2005-12-01
JP2007537938A (en) 2007-12-27
RU2006144816A (en) 2008-06-27
US20120010060A1 (en) 2012-01-12
DE102004026980A1 (en) 2005-12-08
DE102004026980B4 (en) 2007-01-18
US20080101733A1 (en) 2008-05-01

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