EP2158133B1 - Packaging container - Google Patents

Packaging container Download PDF

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Publication number
EP2158133B1
EP2158133B1 EP08758876A EP08758876A EP2158133B1 EP 2158133 B1 EP2158133 B1 EP 2158133B1 EP 08758876 A EP08758876 A EP 08758876A EP 08758876 A EP08758876 A EP 08758876A EP 2158133 B1 EP2158133 B1 EP 2158133B1
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EP
European Patent Office
Prior art keywords
packaging container
layer
sealed
container according
walls
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.)
Active
Application number
EP08758876A
Other languages
German (de)
French (fr)
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EP2158133A1 (en
Inventor
Johannes Wedi
Rudolf Haimerl
Peter Strübbe
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.)
Bischof and Klein SE and Co KG
Original Assignee
Bischof and Klein SE and Co KG
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Publication of EP2158133A1 publication Critical patent/EP2158133A1/en
Application granted granted Critical
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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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/008—Stiffening or reinforcing
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • B31B70/266—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement involving gusset-forming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/36—Folding sheets, blanks or webs by continuously feeding them to stationary members, e.g. plates, ploughs or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8131—Making bags having interengaging closure elements

Definitions

  • the invention relates to a packaging container according to the preamble of claim 1 and to a method for producing such a packaging container according to the preamble of claim 10.
  • Plastic packaging bags in the form of bags or sacks are provided on a large scale and in a great variety of designs for different packaging purposes.
  • multilayer films in which about an inner layer of a polyolefin, especially a low melting point polyethylene ensures that the film on the side of this layer is sealable and at the same time a Moisture barrier results, while a polyester layer on the outside on air-tightness, tear resistance and printability is tuned.
  • the closure itself in the case of slider closures, is an extrudate that is generally not gas- and aroma-tight with a thermoplastic material, especially since the latch itself does not constitute a reliable seal.
  • a thermoplastic material especially since the latch itself does not constitute a reliable seal.
  • these terminal lugs can then be formed from a material which has a sufficiently high gas and / or aroma resistance and which on the other hand with a low-melting, sealable Outer layer or provided with corresponding welding ribs.
  • a packaging container according to the preamble of claim 1 and the process for its preparation are known from EP 1 360 912 B1 known.
  • the object of the invention is therefore to design a packaging container of the known type in an embodiment with multi-layered, also provided with sufficient barrier properties plastic film so that a given gas and aroma resistance can be achieved, such a packaging container with minimal labor and material costs and should be as far as possible to manufacture with common and proven manufacturing technologies.
  • this object is achieved on the one hand by a multi-packaging container according to the preamble of claim 1, starting with the characterizing features of claim 1 and on the other hand by a method according to the preamble of claim 10 starting with the characterizing features of claim 10.
  • the invention is based on the finding that the sealing seams in any case, where transitions are to be overcome by the number of layers of the plastic film, represent weak points in suitable barrier materials. These lead namely with special barrier layers to greater thickness of the individual layers and thus to greater total thickness of sealing seams. In addition, the barrier layers cause greater stiffness and bulkiness of the plastic film. This is particularly noticeable on the folded edges of the Sofaftenrow noticeable in terms of points of failure in the top seal, then very easily enters a leak.
  • This weak point can be eliminated according to the invention by a closure plug of a hot melt compound, which is provided immediately before each folding edge of the gusseted walls within the sealed seam.
  • a plug of a hot melt is applied to one of the sealable surfaces, such as the fold itself or easily and reliably on one of the sealable neighboring surfaces, such as the inside of one of the main walls or an adjacent outer wall of a slider terminal lug and then in the execution melted the top seal to close the cross section of the top seal not only with existing sealable layers of the adjacent walls but in particular with this stopper.
  • the hot melt compound can basically be a low melting point polyethylene (PE), as it is also used for the surface or the welding ribs of slider terminal lugs. But it can also be used another thermoplastic material low melting point.
  • PE polyethylene
  • the often used for the sealable inner layers of plastic film for such packaging containers and optionally also in one of the present container polyethylene is not regularly useful, since it usually draws threads and thus is difficult to dose droplet-shaped, and since it is also stored in stock in the molten state decomposes for a long time. It is also quite advantageous if the hotmelt composition has a lower melting point than the sealable layer of the adjacent plastic films in order to achieve melting and optionally also a thin liquid in an inner region which is relatively far away from the sealing jaws of an externally gripping tool.
  • a packaging container 1 is shown in an aroma-tight embodiment with its upper part unfilled in front view, wherein a front wall 2, with a congruent rear wall forms the two main walls of the plastic bag 1, is connected on both sides with folded in side gusseted walls 3 and 4 via lateral sealing seams 5 and 6, which in turn protrude to a folding edge 7 and 8 inwardly into the packaging container 1.
  • a strip-shaped reclosure with two interlocking profile strips 10 at the upper end and with a slider 10a for opening or closing with double-ply contiguous terminal lugs 11 up to a folding edge 12 parallel to an upper edge 13 of the front wall 2 a.
  • the gussets end flush with the upper edge 13 on the upper side.
  • a top seal seam 14 is executed, which does not have to comply with a minimum width, but generally relatively wide for safety, preferably over the entire area between the folded edge 12 and the top edge 13 of the side seam 5 bis extends to the side seam 6.
  • a cross-sectional area through the top seal 14 is shown in a left side region including side gusset 4.
  • the side fold 4 is here with a half of the fold against one of the front wall 2 corresponding rear wall 2a of the packaging container, with the other half of the fold against a terminal lug 11a, which is congruent with the terminal lug 11 and related to this in the region of a lower fold 12.
  • the film walls shown in cross section are all at least on one side with a sealable surface, such as provided a low-melting polyolefin layer such as PE and PP, which lies on the side facing the container interior.
  • a sealable surface such as provided a low-melting polyolefin layer such as PE and PP, which lies on the side facing the container interior.
  • PE and PP low-melting polyolefin layer
  • the container rear wall 2a with the adjacent gusset half of the side gusset wall 4 is firmly and tightly sealed, while the other gusset half 4 is sealed with the - to the container interior facing half 11a of the terminal lug of the reclosure.
  • the terminal lug 11 of the reclosure is in turn connected to the front wall 2.
  • the two halves of the side gusseted wall 4 are unconnected to each other, but are completed by the folding edge 8, while the upwardly unconnected expiring terminal lugs 11 a and 11 are closed at the bottom by the folding
  • a vertical gusset space 15 is formed.
  • a plug 16 of a hot melt which is located within the sealed seam immediately in front of the folding edge 8 (and just before the folding edge 7) and the gusset space 15 closes off during sealing.
  • the position of the plug 16 can be selected higher or lower in front of the folding edge 8, as long as it is still in the area of the head seam 14 and during sealing leads to the fact that the plug is softened and the gusset space 15 closes.
  • the size of the plug allows for choices as long as the closure is achieved. Excess material is pushed up and down during sealing.
  • the plug 16 consists of a hot melt, which should be easy to process.
  • it is to be selected from a group of known hotmelt compositions which are to be kept warm mechanically for a long time, can be metered well and, in particular, do not draw threads, as is customary in polyethylene for the materials intended for layers of plastic films for the packaging container area.
  • the melting point of the hot melt is also chosen lower than the melting point of the sealable layers, so that premature melting and a good distribution of the plug is possible and in an internal situation in which the heat of the welding jaws must be approached by several layers.
  • Such a melting temperature also does not interfere with the gradation of the melting points of the layers in the plastic films used for the packaging container in which, for example, an inner layer of polyethylene melts much lower than an outer layer of polyester, so that only the inner layer is involved in the sealing ,
  • FIG. 3 illustrated embodiment of a packaging container 21 is largely consistent with the after Fig.1 and 2 match, so that the related reference numerals are taken over.
  • the gusseted walls have shortened upper edges 17, 18 that end within the top seal 14. This is a measure to close the gussets internally. However, this measure has not proved sufficient to exclude the above-described leakage in the top seal 14 before the folded edges 7 and 8.
  • There escaping gas for example, can not escape upwards because the seal seam here runs continuously and after elimination of the gussets 4, the terminal lugs 11 and 11 a with the main walls 2 and 2a connects tightly.
  • the leakage problem solved here also occurs when the reclosure 9 is dispensed with at the top of the packaging container 1, that is to say when the packaging container is closed with the top-seal seam and remains open when the top seal seam is removed or another opening of the packaging container. Then, though omitted in Fig. 2 the intermediate walls 11 and 11 a, but then the leakage problem occurs between the remaining layers and is also to be solved with the plug 16.
  • the plug is applied during the joining of the walls of the bag, after gussets are fixed at least on one of the main surfaces and the folded edges of the side gusset walls are fixed.
  • the plug 16 is then applied in each case before the fold edges.
  • the sealing of the corresponding problem area is then carried out with a seal of conventional type, without the need for special further steps or special mechanical precautions during sealing.

Abstract

The invention relates to a packaging container of multilayer plastic foil which can be sealed with at least one layer lying on the container inner side. The packaging container has two primary walls (2, 2a) lying opposite each other and placed opposite each other in a top sealing seam (14), and two side fold walls (3, 4) which are folded into the top sealing seam (14) as a double layer, flat between the primary walls (2, 2a) and toward the inside, with folded edges (7, 8) oriented against each other. The invention is improved in the sense of prespecified air-tightness and aroma-tightness, with minimal work and material requirements, in that a closure plug (16) made out of a hot melt mass is arranged inside the sealing seam (14) directly in front of each folded edge (7, 8).

Description

Die Erfindung betrifft einen Verpackungsbehälter nach dem Oberbegriff des Anspruchs 1 sowie ein Verfahren zur Herstellung eines solchen Verpackungsbehälters nach dem Oberbegriff des Anspruchs 10.The invention relates to a packaging container according to the preamble of claim 1 and to a method for producing such a packaging container according to the preamble of claim 10.

Verpackungsbehälter aus Kunststoffolie in Form von Beuteln oder Säcken werden in großem Umfang und in großer Ausführungsvielfalt für unterschiedliche Verpakkungszwecke vorgesehen. Für alltägliche Anforderungen an luft- und feuchtigkeitsdichte Verpackungsbehälter dieser Art werden regelmäßig schon mehrschichtige Folien eingesetzt, bei denen etwa eine Innenschicht aus einem Polyolefin, insbesondere einem Polyethylen mit niedrigem Schmelzpunkt dafür sorgt, daß die Folie auf der Seite dieser Schicht siegelbar ist und auch gleichzeitig eine Feuchtigkeitsbarriere ergibt, während eine Polyesterschicht auf der Außenseite auf Luftdichtigkeit, Reißfestigkeit und Bedruckbarkeit abgestimmt wird.Plastic packaging bags in the form of bags or sacks are provided on a large scale and in a great variety of designs for different packaging purposes. For everyday requirements of air and moisture-proof packaging containers of this type are already used multilayer films in which about an inner layer of a polyolefin, especially a low melting point polyethylene ensures that the film on the side of this layer is sealable and at the same time a Moisture barrier results, while a polyester layer on the outside on air-tightness, tear resistance and printability is tuned.

Solche gebräuchlichen Materialkombinationen für die Schichten von Kunststoffolien bei Verpackungsbehältern sind dann allerdings noch nicht geeignet, hohe Anforderungen an die Gasdichtigkeit und/oder Aromadichtigkeit etwa bei sensiblen Lebensmitteln, Futterstoffen oder anderen Verpackungsgütern zu erzielen. Für diese ergibt sich die Notwendigkeit, Kunststoffolien mit einer Barriereschicht, etwa aus einem Ethylenvinylazetat (EVA) auf Polyethylenbasis oder einem EVOH zu verwenden. Ebenso kommen metallische Barriereschichten in Betracht. Damit lassen sich gas- und aromadichte Behälterflächen sicherstellen, die aber darüber hinaus in Anschlußbereichen, etwa bei Siegelnähten zwischen einander anschließenden Wand- oder Bodenflächen, durchgehend zu versiegeln sind und insbesondere auch gegenüber eingearbeiteten Wiederverschlüssen die Dichtigkeitsvorgaben erfüllen müssen. So ist etwa bei Slider-Verschlüssen der Verschluß selbst mit seinem Verrastungsprofil ein Extrudat, das im allgemeinen mit einem thermoplastischen Kunststoff nicht gas- und aromadicht auszuführen ist, zumal auch die Verrastung selbst keine verläßliche Dichtung darstellt. Es kann aber so ein Slider-Verschluß mit durchgängig zusammenhängenden Anschlußfahnen kopfseitig in einen solchen Verpackungsbehälter eingesiegelt werden, wobei diese Anschlußfahnen dann aus einem Material gebildet werden kann, welches eine ausreichend hohe Gas- und/oder Aromadichtigkeit aufweist und welches andererseits mit einer niedrigschmelzenden, einsiegelbaren Außenschicht oder mit entsprechenden Schweißrippen versehen wird.However, such conventional combinations of materials for the layers of plastic films in packaging containers are then not yet suitable to achieve high requirements for the gas-tightness and / or aroma resistance, for example, in sensitive foods, linings or other packaging goods. For these, there is a need to use plastic films with a barrier layer such as polyethylene-based ethylene-vinyl acetate (EVA) or EVOH. Likewise, metallic barrier layers come into consideration. This gas-and aroma-tight container surfaces can be ensured, but beyond that in connection areas, such as in sealing seams between adjacent wall or bottom surfaces, are to be sealed continuously and in particular against incorporated reclosures must meet the tightness specifications. For example, in the case of slider closures, the closure itself, with its latching profile, is an extrudate that is generally not gas- and aroma-tight with a thermoplastic material, especially since the latch itself does not constitute a reliable seal. However, it can be sealed head end in such a packaging container as a slider closure with continuously connected terminal lugs, these terminal lugs can then be formed from a material which has a sufficiently high gas and / or aroma resistance and which on the other hand with a low-melting, sealable Outer layer or provided with corresponding welding ribs.

Es hat sich allerdings gezeigt, daß diese Maßnahmen auch bei konsequenter Durchführung nicht ausgereichen, aus einem Verpackungsbehälter geläufiger Art einen solchen mit hoher Gas- und Aromadichtigkeit zu erzielen. Vielmehr waren bei der Erprobung trotz aller Sorgfalt in der Herstellung solcher Verpackungsbehälter noch Undichtigkeiten festzustellen. Ein Verpackungsbehälter gemäß dem Oberbegriff des Anspruchs 1 und das Verfahren zu seiner Herstellung sind aus der EP 1 360 912 B1 bekannt.It has been found, however, that these measures do not suffice even with consistent implementation, from a packaging container of common type to achieve such a high gas and aroma resistance. Rather, in the testing despite leaks in the production of such packaging containers still leakages were noted. A packaging container according to the preamble of claim 1 and the process for its preparation are known from EP 1 360 912 B1 known.

Aufgabe der Erfindung ist es dementsprechend, einen Verpackungsbehälter der vorbekannten Art in einer Ausführungsform mit mehrschichtiger, auch mit ausreichenden Barriereeigenschaften versehener Kunststoffolie so auszugestalten, daß eine vorgegebene Gas- und Aromadichtigkeit zu erzielen ist, wobei ein solcher Verpackungsbehälter mit möglichst geringem Arbeits- und Materialaufwand und weitestgehend mit geläufigen und erprobten Herstellungstechnologien zu fertigen sein soll.The object of the invention is therefore to design a packaging container of the known type in an embodiment with multi-layered, also provided with sufficient barrier properties plastic film so that a given gas and aroma resistance can be achieved, such a packaging container with minimal labor and material costs and should be as far as possible to manufacture with common and proven manufacturing technologies.

Gemäß der Erfindung wird diese Aufgabe einerseits von einem Mehrverpackungsbehälter nach dem Oberbegriff des Anspruchs 1 ausgehend mit den kennzeichnenden Merkmalen des Anspruchs 1 und andererseits von einem Verfahren nach dem Oberbegriff des Anspruchs 10 ausgehend mit den kennzeichnenden Merkmalen des Anspruchs 10 gelöst.According to the invention, this object is achieved on the one hand by a multi-packaging container according to the preamble of claim 1, starting with the characterizing features of claim 1 and on the other hand by a method according to the preamble of claim 10 starting with the characterizing features of claim 10.

Der Erfindung liegt die Erkenntnis zugrunde, daß die Siegelnähte jedenfalls dort, wo Übergänge von der Zahl der Lagen der Kunststoffolie zu überwinden sind, Schwachstellen bei geeigneten Barrierematerialien darstellen. Diese führen nämlich mit besonderen Sperrschichten zu größerer Dicke der Einzelschichten und damit auch zu größerer Gesamtdicke von Siegelnähten. Darüber hinaus bewirken die Barriereschichten eine größere Steifigkeit und Sperrigkeit der Kunststoffolie. Dies macht sich besonders an den Faltkanten der Seitenfaftenwände bemerkbar im Sinne von Störungsstellen bei der Kopfsiegelnaht, an der dann sehr leicht eine Leckage eintritt.The invention is based on the finding that the sealing seams in any case, where transitions are to be overcome by the number of layers of the plastic film, represent weak points in suitable barrier materials. These lead namely with special barrier layers to greater thickness of the individual layers and thus to greater total thickness of sealing seams. In addition, the barrier layers cause greater stiffness and bulkiness of the plastic film. This is particularly noticeable on the folded edges of the Seitenfaftenwände noticeable in terms of points of failure in the top seal, then very easily enters a leak.

Diese Schwachstelle kann gemäß der Erfindung durch einen Verschlußpfropfen aus einer Heißschmelzmasse beseitigt werden, der unmittelbar vor jeder Faltkante der Seitenfaltenwände innerhalb der Siegelnaht vorgesehen wird. Verfahrenstechnisch wird ein solcher Pfropfen aus einer Heißschmelzmasse auf eine der siegelbaren Flächen, etwa an die Faltkante selbst oder aber einfach und verläßlich auf eine der siegelbaren Nachbarflächen, etwa der Innenseite einer der Hauptwände oder einer benachbarten Außenwand einer Slider-Anschlußfahne aufgegeben und dann bei der Ausführung der Kopfsiegelnaht erschmolzen, um den Querschnitt der Kopfsiegelnaht nicht nur mit vorhandenen siegelbaren Schichten der benachbarten Wände sondern insbesondere mit diesem Pfropfen zu schließen.This weak point can be eliminated according to the invention by a closure plug of a hot melt compound, which is provided immediately before each folding edge of the gusseted walls within the sealed seam. Technically, such a plug of a hot melt is applied to one of the sealable surfaces, such as the fold itself or easily and reliably on one of the sealable neighboring surfaces, such as the inside of one of the main walls or an adjacent outer wall of a slider terminal lug and then in the execution melted the top seal to close the cross section of the top seal not only with existing sealable layers of the adjacent walls but in particular with this stopper.

Die Heißschmelzmasse kann grundsätzlich ein niedrigschmelzendes Polyethylen (PE) sein, wie es auch für die Oberfläche oder die Schweißrippen von Slider-Anschlußfahnen verwandt wird. Es kann aber auch ein anderes thermoplastisches Material niedrigen Schmelzpunktes verwandt werden. Das für die versiegelbaren Innenschichten von Kunststoffolie für derartige Verpackungsbehälter vielfach und gegebenenfalls auch bei einem der vorliegenden Behälter zu verwendende Polyethylen ist dabei regelmäßig nicht brauchbar, da es meistens Fäden zieht und insofern schwer tropfenförmig dosierbar ist, und da es sich auch bei Bevorratung im Schmelzzustand über längere Zeit zersetzt. Es ist auch durchaus vorteilhaft, wenn die Heißschmelzmasse einen niedrigeren Schmelzpunkt als die siegelbare Schicht der benachbarten Kunststoffolien aufweist, um ein Erschmelzen und ggf. auch eine Dünnflüssigkeit in einem innenliegenden, von den Siegelbacken eines von außen aufgreifenden Werkzeugs relativ weit abliegenden Bereich zu erzielen.The hot melt compound can basically be a low melting point polyethylene (PE), as it is also used for the surface or the welding ribs of slider terminal lugs. But it can also be used another thermoplastic material low melting point. The often used for the sealable inner layers of plastic film for such packaging containers and optionally also in one of the present container polyethylene is not regularly useful, since it usually draws threads and thus is difficult to dose droplet-shaped, and since it is also stored in stock in the molten state decomposes for a long time. It is also quite advantageous if the hotmelt composition has a lower melting point than the sealable layer of the adjacent plastic films in order to achieve melting and optionally also a thin liquid in an inner region which is relatively far away from the sealing jaws of an externally gripping tool.

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden nachfolgend näher beschrieben. In der Zeichnung zeigen:

Fig. 1
Vorderansicht eines Verpackungsbehälters in einer ersten Ausführungs- form
Fig. 2
vergrößerter Schnitt nach Linie II-II in Fig. 1 und
Fig. 3
eine Fig. 1 entsprechende Ansicht einer abgewandelten Ausführungsform mit oberseitig verkürzten Seitenfalten.
Two embodiments of the invention are illustrated in the drawings and will be described in more detail below. In the drawing show:
Fig. 1
Front view of a packaging container in a first embodiment
Fig. 2
enlarged section along line II-II in Fig. 1 and
Fig. 3
a Fig. 1 corresponding view of a modified embodiment with the top side shortened side folds.

In Fig. 1 ist ein Verpackungsbehälter 1 in aromadichter Ausführungsform mit seinem oberen Teil in Vorderansicht unbefüllt dargestellt, wobei eine Vorderwand 2, die mit einer deckungsgleichen Rückwand die beiden Hauptwände des Kunststoffbeutels 1 bildet, auf beiden Seiten mit nach innen eingefalteten Seitenfaltenwänden 3 und 4 über seitliche Siegelnähte 5 und 6 verbunden ist, die ihrerseits bis zu einer Faltkante 7 bzw. 8 nach innen in den Verpackungsbehälter 1 hineinragen. Von oben greift ein leistenförmiger Wiederverschluß mit zwei ineinander verrastbaren Profilleisten 10 am oberen Ende und mit einem Gleiter 10a zum Öffnen oder Schließen mit doppellagig zusammenhängenden Anschlußfahnen 11 bis zu einer Faltkante 12 parallel zu einer Oberkante 13 der Vorderwand 2 ein. Die Seitenfalten enden oberseitig bündig mit der Oberkante 13.In Fig. 1 a packaging container 1 is shown in an aroma-tight embodiment with its upper part unfilled in front view, wherein a front wall 2, with a congruent rear wall forms the two main walls of the plastic bag 1, is connected on both sides with folded in side gusseted walls 3 and 4 via lateral sealing seams 5 and 6, which in turn protrude to a folding edge 7 and 8 inwardly into the packaging container 1. From above engages a strip-shaped reclosure with two interlocking profile strips 10 at the upper end and with a slider 10a for opening or closing with double-ply contiguous terminal lugs 11 up to a folding edge 12 parallel to an upper edge 13 of the front wall 2 a. The gussets end flush with the upper edge 13 on the upper side.

In einem oberen Bereich des Verpackungsbehältnisses 1 wird längs der gesamten Oberkante 13 eine Kopfsiegelnaht 14 ausgeführt, die zwar keine Mindestbreite einhalten muß, im allgemeinen aber sicherheitshalber relativ breit, vorzugsweise über den gesamten Bereich zwischen der Faltkante 12 und der Oberkante 13 von der Seitensiegelnaht 5 bis zur Seitensiegelnaht 6 erstreckt ist.In an upper region of the packaging container 1 along the entire upper edge 13, a top seal seam 14 is executed, which does not have to comply with a minimum width, but generally relatively wide for safety, preferably over the entire area between the folded edge 12 and the top edge 13 of the side seam 5 bis extends to the side seam 6.

Aus Fig. 2 wird ein Querschnittsbereich durch die Kopfsiegelnaht 14 in einem linken, die Seitenfalte 4 einschließenden Bereich dargestellt. Die Seitenfalte 4 liegt hier mit einer Faltenhälfte gegen eine der Vorderwand 2 entsprechende Rückwand 2a des Verpackungsbehälters, mit der anderen Faltenhälfte gegen eine Anschlußfahne 11a an, die deckungsgleich mit der Anschlußfahne 11 ist und mit dieser im Bereich einer unteren Falte 12 zusammenhängt. Bei einem ersten Öffnen des Behälters zur Ingebrauchnahme werden die Anschlußfahnen 11a und 11 durch Aufschneiden oder durch Aufreißen längs einer vorgegebenen Schwächungslinie getrennt. Bis dahin bilden sie eine durchgehende Wandung im Kopfbereich. Die Anschlußfahne 11 liegt ihrerseits an der Vorderwand 2 an. Die im Querschnitt dargestellten Folienwandungen sind allesamt zumindest auf einer Seite mit einer siegelbaren Oberfläche, etwa einer niedrigschmelzenden Polyolefin-Schicht wie PE und PP versehen, die auf der zur Behälterinnenseite gewandten Seite liegt. Dadurch ist die Behälterrückwand 2a mit der benachbarten Seitenfaltenhälfte der Seitenfaltenwand 4 fest und dicht versiegelt, während die andere Seitenfaltenhälfte 4 mit der - zum Behälterinneren gerichteten Hälfte 11a der Anschlußfahne des Wiederverschlusses versiegelt ist. die Anschlußfahne 11 des Wiederverschlusses ist ihrerseits mit der Vorderwand 2 verbunden. Die beiden Hälften der Seitenfaltenwand 4 liegen unverbunden aufeinander, sind allerdings durch die Faltkante 8 abgeschlossen, während die nach oben hin unverbunden auslaufenden Anschlußfahnen 11a und 11 nach unten hin durch die Faltekante 12 abgeschlossen sind.Out Fig. 2 For example, a cross-sectional area through the top seal 14 is shown in a left side region including side gusset 4. The side fold 4 is here with a half of the fold against one of the front wall 2 corresponding rear wall 2a of the packaging container, with the other half of the fold against a terminal lug 11a, which is congruent with the terminal lug 11 and related to this in the region of a lower fold 12. Upon a first opening of the container for putting the terminal lugs 11a and 11 are separated by cutting or tearing along a predetermined line of weakness. Until then, they form a continuous wall in the head area. The terminal lug 11 in turn rests against the front wall 2. The film walls shown in cross section are all at least on one side with a sealable surface, such as provided a low-melting polyolefin layer such as PE and PP, which lies on the side facing the container interior. As a result, the container rear wall 2a with the adjacent gusset half of the side gusset wall 4 is firmly and tightly sealed, while the other gusset half 4 is sealed with the - to the container interior facing half 11a of the terminal lug of the reclosure. the terminal lug 11 of the reclosure is in turn connected to the front wall 2. The two halves of the side gusseted wall 4 are unconnected to each other, but are completed by the folding edge 8, while the upwardly unconnected expiring terminal lugs 11 a and 11 are closed at the bottom by the folding edge 12.

In der Querschnittsdarstellung gemäß Fig. 2 zeigt sich dabei, daß die Kopfsiegelnaht einen problematischen Übergang im Bereich vor der Faltkante 8 der Seitenfaltenwand 4 zu überwinden hat, wo ein vertikaler Zwickelraum 15 gebildet ist. Dieser wird nach kritischer gegenüber vergleichbaren Beutelausführungen dadurch, daß die Folien im Sinne einer Gas- und Aromadichtigkeit mit Barriereschichten ausgestattet sind, die diese Folien in der Dicke und/oder Steifigkeit verstärken. An dieser Stelle besteht auch bei sorgfältig ausgewählten Materialien und bei sorgfältiger Ausführung der Versiegelung die Gefahr einer Leckage. Dieser Gefahr wird gemäß der Erfindung mit einem Pfropfen 16 aus einer Heißschmelzmasse begegnet, die innerhalb der Siegelnaht unmittelbar vor der Faltkante 8 (und genauso vor der Faltkante 7) angeordnet ist und den Zwickelraum 15 beim Versiegeln absperrt. Die Lage des Pfropfens 16 kann dabei höher oder tiefer vor der Faltkante 8 gewählt werden, solange diese noch im Bereich der Kopfsiegelnaht 14 liegt und beim Versiegeln dazu führt, daß der Pfropfen erweicht wird und den Zwickelraum 15 verschließt.In the cross-sectional view according to Fig. 2 shows that the top seal has overcome a problematic transition in the area in front of the fold edge 8 of the side gusset wall 4, where a vertical gusset space 15 is formed. This becomes more critical compared to comparable bag designs in that the films are provided with barrier layers in the sense of a gas and aroma resistance, which reinforce these films in thickness and / or rigidity. At this point, even with carefully selected materials and careful execution of the seal there is a risk of leakage. This danger is met according to the invention with a plug 16 of a hot melt, which is located within the sealed seam immediately in front of the folding edge 8 (and just before the folding edge 7) and the gusset space 15 closes off during sealing. The position of the plug 16 can be selected higher or lower in front of the folding edge 8, as long as it is still in the area of the head seam 14 and during sealing leads to the fact that the plug is softened and the gusset space 15 closes.

Auch die Größe des Pfropfens läßt Wahlmöglichkeiten zu, solange der Verschluß erzielt wird. Überschüssiges Material wird beim Versiegeln nach oben und unten herausgedrückt.Also, the size of the plug allows for choices as long as the closure is achieved. Excess material is pushed up and down during sealing.

Der Pfropfen 16 besteht aus einer Heißschmelzmasse, die gut verarbeitbar sein soll. Insbesondere ist sie aus einer Gruppe bekannter Heißschmelzmassen zu wählen, die langzeitig maschinell warm zu halten ist, gut dosiert werden kann und insbesondere keine Fäden zieht, wie dies bei Polyethylen der für Schichten von Kunststoffolien für den Verpackungsbehälterbereich vorgesehenen Materialien üblich ist. Zweckmäßig ist der Schmelzpunkt der Heißschmelzmasse auch niedriger gewählt als der Schmelzpunkt der siegelbaren Schichten, damit ein frühzeitiges Aufschmelzen und ein gutes Verteilen des Pfropfens möglich wird und dies auch in einer innenliegenden Situation, bei der die Hitze der Schweißbacken erst durch mehrere Schichten herangetreten werden muß. Eine solche Schmelztemperatur greift auch nicht in die Abstufung der Schmelzpunkte der Schichten bei den für den Verpakkungsbehälter verwendeten Kunststoffolien ein, bei der beispielsweise eine innere Schicht aus Polyethylen sehr viel niedriger schmilzt als eine Außenschicht aus Polyester, so daß nur die Innenschicht an der Versiegelung beteiligt wird.The plug 16 consists of a hot melt, which should be easy to process. In particular, it is to be selected from a group of known hotmelt compositions which are to be kept warm mechanically for a long time, can be metered well and, in particular, do not draw threads, as is customary in polyethylene for the materials intended for layers of plastic films for the packaging container area. Suitably, the melting point of the hot melt is also chosen lower than the melting point of the sealable layers, so that premature melting and a good distribution of the plug is possible and in an internal situation in which the heat of the welding jaws must be approached by several layers. Such a melting temperature also does not interfere with the gradation of the melting points of the layers in the plastic films used for the packaging container in which, for example, an inner layer of polyethylene melts much lower than an outer layer of polyester, so that only the inner layer is involved in the sealing ,

Eine in Fig. 3 dargestellte Ausführungsform eines Verpackungsbehälters 21 stimmt weitgehend mit der nach Fig.1 und 2 überein, so daß auch die dort verwandten Bezugszeichen übernommen sind. Allerdings weisen die Seitenfaltenwände verkürzte Oberkanten 17,18 auf, die innerhalb der Kopfsiegelnaht 14 enden. Dies ist eine Maßnahme, die Seitenfalten intern zu verschließen. Allerdings hat auch diese Maßnahme sich nicht als ausreichend erwiesen, die vorbeschriebene Leckage in der Kopfsiegelnaht 14 vor den Faltkanten 7 und 8 auszuschließen. Dort entweichendes Gas beispielsweise kann zwar nicht nach oben hin austreten, da die Siegelnaht hier durchgehend verläuft und nach Wegfall der Seitenfalten 4 die Anschlußfahnen 11 und 11 a mit den Hauptwänden 2 und 2a dicht verbindet. Es bildet sich jedoch längs der Seitenfalten-Oberkanten 17 und 18 entsprechende Zwickelräume und das entweichende Gas kann dann längs der Faltkanten 7 bzw. 8 um das obere Ende herum jeweils in den freien Zwischenraum zwischen die Lagen der Seitenfaltenwand 4 bzw. 3 eintreten und damit entweichen. Dem wird wiederum mit einem entsprechenden Pfropfen 16 begegnet.An in Fig. 3 illustrated embodiment of a packaging container 21 is largely consistent with the after Fig.1 and 2 match, so that the related reference numerals are taken over. However, the gusseted walls have shortened upper edges 17, 18 that end within the top seal 14. This is a measure to close the gussets internally. However, this measure has not proved sufficient to exclude the above-described leakage in the top seal 14 before the folded edges 7 and 8. There escaping gas, for example, can not escape upwards because the seal seam here runs continuously and after elimination of the gussets 4, the terminal lugs 11 and 11 a with the main walls 2 and 2a connects tightly. However, it forms along the gusset top edges 17 and 18 corresponding gussets and the escaping gas can then along the folding edges 7 and 8 around the upper end respectively in the free space between the layers of the side gusset wall 4 and 3 enter and thus escape , This is in turn countered with a corresponding plug 16.

Das hier gelöste Leckageproblem tritt auch dann auf, wenn an der Oberseite des Verpackungsbehälters 1 auf den Wiederverschluß 9 verzichtet wird, wenn also der Verpackungsbehälter mit der Kopfsiegelnaht verschlossen und mit Entfernen der Kopfsiegelnaht oder einem sonstigen Öffnen des Verpackungsbehältnisses offen bleibt. Dann entfallen zwar in Fig. 2 die Zwischenwandungen 11 und 11a, jedoch tritt dann das Leckageproblem zwischen den verbleibenden Schichten auf und ist gleichfalls mit dem Pfropfen 16 zu lösen.The leakage problem solved here also occurs when the reclosure 9 is dispensed with at the top of the packaging container 1, that is to say when the packaging container is closed with the top-seal seam and remains open when the top seal seam is removed or another opening of the packaging container. Then, though omitted in Fig. 2 the intermediate walls 11 and 11 a, but then the leakage problem occurs between the remaining layers and is also to be solved with the plug 16.

Verfahrungstechnisch wird der Pfropfen während des Zusammenfügens der Wandungen des Beutels aufgebracht, nachdem Seitenfalten zumindest an einer der Hauptflächen festliegen und die Faltkanten der Seitenfaltenwände festliegen. Der Pfropfen 16 wird dann jeweils vor den Faltenkanten aufgebracht. Die Abdichtung des entsprechenden Problemsbereichs erfolgt dann mit einer Versiegelung gebräuchlicher Art, ohne daß es dazu besonderer weiterer Arbeitsschritte oder besonderer maschineller Vorkehrungen beim Versiegeln bedürfte.In terms of process technology, the plug is applied during the joining of the walls of the bag, after gussets are fixed at least on one of the main surfaces and the folded edges of the side gusset walls are fixed. The plug 16 is then applied in each case before the fold edges. The sealing of the corresponding problem area is then carried out with a seal of conventional type, without the need for special further steps or special mechanical precautions during sealing.

Claims (10)

  1. Packaging container of multi-layered plastics film able to be sealed at least by a layer situated on the inside of the container, having two main walls (2, 2a) situated opposite one another which are placed against one another in a sealed head seam (14), and having two connecting walls (3, 4), forming side folds, which, in the sealed head seam (14), are folded inwards between the main walls (2, 20) into a flat double layer to have folded edges (7, 8) which are directed towards one another, characterised in that a closing-off plug (16) of a hot-melt substance is arranged within the sealed head seam (14) immediately in front of each folded edge (7, 8).
  2. Packaging container according to claim 1, characterised in that the closing-off plug (16) is composed of a hot-melt substance which does not form strings.
  3. Packaging container according to claim 1 or 2, characterised in that the hot-melt substance has a lower melting point then the sealable layer of the plastics film which is situated on the inside of the container.
  4. Packaging container according to claim 1, 2 or 3, characterised in that, as well as a sealable layer which is situated on the inside of the container, the plastics film also has at least one layer having a higher melting point.
  5. Packaging container according to claim 4, characterised in that the plastics film has an inner layer of polyethylene and a further layer of a polyester.
  6. Packaging container according to one of claims 1 to 5, characterised in that the plastics film has at least one sealed barrier layer.
  7. Packaging container according to one of claims 1 to 6, characterised in that the side folds (3, 4) extend upwards above the sealed head seam (14).
  8. Packaging container according to one of claims 1 to 6, characterised in that the side folds (3, 4) end within the sealed head seam (14).
  9. Packaging container according to one of claims 1 to 8, characterised in that a resealable closure (9) in strip form having connecting flaps (11, 11a), in the form of a continuous double layer, which can be sealed at both outer sides is inserted between one of the main walls (2, 2a) and the walls (3, 4) forming the side folds which are folded in into a double layer.
  10. Method of producing a packaging container (1, 21) of multi-layered plastics film (2, 2a) able to be sealed at least by a layer situated on the inside of the container, having main walls situated opposite one another which are placed flat against one another in a sealed head seam (14), and having two connecting walls (3, 4), forming side folds, which, before the sealed head seam (14) is made, are folded inwards between the main walls (2, 2a) into a flat double layer to have folded edges (7, 8) which are directed towards one another, characterised in that, before the sealed head seam (14) is made, a closing-off plug (16) of a hot-melt substance is applied to one of the sealable surfaces immediately in front of each folded edge (7, 8).
EP08758876A 2007-06-16 2008-05-30 Packaging container Active EP2158133B1 (en)

Applications Claiming Priority (2)

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DE102007027784A DE102007027784B4 (en) 2007-06-16 2007-06-16 packaging container
PCT/EP2008/004300 WO2008155009A1 (en) 2007-06-16 2008-05-30 Packaging container

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EP2158133A1 EP2158133A1 (en) 2010-03-03
EP2158133B1 true EP2158133B1 (en) 2011-06-22

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AT (1) ATE513752T1 (en)
AU (1) AU2008266593B2 (en)
DE (1) DE102007027784B4 (en)
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WO (1) WO2008155009A1 (en)

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DE102007027784B4 (en) 2010-06-02
WO2008155009A1 (en) 2008-12-24
AU2008266593A1 (en) 2008-12-24
EP2158133A1 (en) 2010-03-03
AU2008266593B2 (en) 2012-11-01
DE102007027784A1 (en) 2008-12-18
ES2368537T3 (en) 2011-11-18
US20100183249A1 (en) 2010-07-22
ATE513752T1 (en) 2011-07-15

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