EP1714894B1 - Sealing strip, associated foil packaging and methods for their manufacture - Google Patents

Sealing strip, associated foil packaging and methods for their manufacture Download PDF

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Publication number
EP1714894B1
EP1714894B1 EP06005923A EP06005923A EP1714894B1 EP 1714894 B1 EP1714894 B1 EP 1714894B1 EP 06005923 A EP06005923 A EP 06005923A EP 06005923 A EP06005923 A EP 06005923A EP 1714894 B1 EP1714894 B1 EP 1714894B1
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EP
European Patent Office
Prior art keywords
sealing
layer
strip
pressure
seam
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.)
Not-in-force
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EP06005923A
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German (de)
French (fr)
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EP1714894A1 (en
Inventor
Sven Jacobsen
Dorit Nelke
Markus Koppers
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.)
Wipak Walsrode GmbH and Co KG
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Wipak Walsrode GmbH and Co KG
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Application filed by Wipak Walsrode GmbH and Co KG filed Critical Wipak Walsrode GmbH and Co KG
Priority to PL06005923T priority Critical patent/PL1714894T3/en
Publication of EP1714894A1 publication Critical patent/EP1714894A1/en
Application granted granted Critical
Publication of EP1714894B1 publication Critical patent/EP1714894B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/18—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps
    • B65D33/20—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps using pressure-sensitive adhesive

Definitions

  • the invention relates to a sealing strip for the production of a sealable by means of an integrated pressure-sensitive adhesive after tearing seal on a film packaging, its use for the production of film packaging, and a film packaging, in particular a film tube bag, with at least one sealing strip containing the sealing strip and an associated manufacturing method.
  • Film packaging has found industrially diverse application because they are lightweight, hygienic and liquid-tight, possibly also gas-tight. It is also possible to make the film packaging visually appealing and to print.
  • a common perceived disadvantage of film packaging is that a tightly sealed package can be difficult to open and often unpredictably ruptures in an undesired manner, completely destroying the package. This disadvantage becomes a problem if the packaging is still needed for further storage of the contents or residual contents.
  • Film packages are often joined by heat sealing seams.
  • the film packaging material carries at least one side of a fusible surface layer, so that e.g. two provided with such a sealing layer and against each other laid film webs or sections with a sealing tool accurately welded, i. sealed, can be.
  • Such sealing layers can be sealed tightly so that opening of the seam is practically no longer possible since previously the packaging film itself will rupture.
  • sealing layer materials have been developed, which, while ensuring a secure closure of the packaging, but by tensile forces that are smaller than required for tearing the base film, detached from each other, ie can be deducted.
  • Such sealing layers and seams are also referred to in the jargon as "peelable”. From the EP 1 074 477 It is also already known to produce a peelable sealed seam by inserting a peelable film strip.
  • peelable sealing seams have the disadvantage that the packaging can be opened neatly and non-destructively, but can not be closed again.
  • One way to further protect the contents of the package is to reseal the package with a pressure-sensitive adhesive strip.
  • the adhesive strip which is partially covered with protective film (release film or paper), can already be stored on the still closed packaging; associated examples are i.a. known from tobacco pouches.
  • the disadvantage is that the packaged good is generally not so complete, e.g. also airtight, protected as would be desirable.
  • the film strip consists of a carrier layer, which is welded to the film material of the plastic film bag in a first film section of the closure region, a pressure-sensitive adhesive layer over the carrier layer and a sealing layer, which covers the pressure-sensitive adhesive layer and on the opposite film section of the film bag over a portion of Strip width is sealed.
  • a predetermined crack region is created within the strip, which opens the sealed seam while exposing the pressure-sensitive adhesive.
  • a brittle set tear-resistant layer for example of an ionomer in the immediate vicinity of the pressure-sensitive adhesive layer is present, or that the adhesive layer adjacent to the sealing layer itself is set brittle to allow at this point tearing of the strip in itself, such as this eg in the WO 96/40504 or in the DE 101 09 209 is described in more detail.
  • the WO 00/58167 A discloses a three-layer sealing strip of the layer sequence sealing layer pressure-sensitive adhesive layer sealing layer, which is sealed on both sides in a foil packaging during their production. A connecting seam is obtained which can be opened and closed again with the aid of the pressure-sensitive adhesive.
  • the object of the invention is thus to form a heat-sealed seam on a film package, in particular a film bag, which comprises an internal pressure-sensitive adhesive and which is located at a position at which the package is to be opened, so that the package as possible by loosening the seam undamaged and, in any case, opened nondestructively and then can be closed again with the help of the provided within the seam pressure-sensitive adhesive.
  • the invention initially provides a sealing strip according to claim 1, which can be inserted into a heat seal seam and thus enables the desired packaging properties at the seam.
  • the sealing strip according to the invention for the production of a resealable by means of an integrated pressure-sensitive adhesive after tearing open
  • Sealing seam on a film packaging is multi-layered and has an internal pressure-sensitive adhesive layer and on both outer surfaces each have a sealing layer, wherein the sealing strip, the layer sequence: sealing layer / pressure-sensitive adhesive layer / tear-resistant carrier layer of a bi- or monoaxially oriented film of polypropylene (PP), polyethylene terephthalate (PET ) or polyimide (PA) or from mixtures or copolymers / sealing layer formed with or between these polymers, the pressure-sensitive adhesive layer being in direct contact over the entire surface with the outer sealing layers and the carrier layer and the properties of the pressure-sensitive adhesive layer and the sealing layers being matched to one another, that none of the layers other than the pressure-sensitive adhesive layer is a tear-able layer to give a predetermined cracking area within a layer of the strip, and that the double-sided sealed strip in the application position is intrinsic the adhesive layer or at the contact surface of the pressure-sensitive adhesive layer tears to an adjacent layer in that the adhesive force of pressure-sensitive adhesive layer is equal to 10 N / 15
  • the double-sided sealed strip in the application position will rupture within the pressure-sensitive adhesive layer or at the contact surface of the pressure-sensitive adhesive layer to form an adjacent sealing layer.
  • a fully adhesive adhesive layer will be revealed, while the sealing layers of the sealing strip also remain firmly bonded to the packaging material over their entire surface due to their greater sealing strength. Unclean or frayed cracks or stretched film areas that affect the bag shape and reclosure are safely avoided.
  • the invention is based on the finding that it is not necessary, as has hitherto generally been assumed in the prior art, that the adhesive force of the pressure-sensitive adhesive layer must be greater than the tear strength of one of the sealing layers, which make it possible to open the packaging due to their brittleness and tear strength and at the same time expose the adhesive. Rather, in the course of the invention, much better results could be achieved if the adhesive force (adhesive force to an adjacent surface or cohesive force) of the pressure-sensitive adhesive layer is large enough to ensure a relatively tight reclosure of the package, but above all the seal strength as well as the tear strength the adjacent sealing layer or sealing layers larger, preferably significantly greater than the adhesive force of the pressure-sensitive adhesive layer.
  • the seal strength of at least the sealant layer adjacent to the pressure sensitive adhesive is more than twice the adhesive force of the pressure sensitive adhesive.
  • the adhesive force may be the force of adhesion of the adhesive to a planar surface or cohesive force within the adhesive itself, depending on the type of adhesive.
  • the pressure-sensitive adhesive used in the invention is a cohesive-fracture-prone adhesive. This property can be adjusted by adhesive technology.
  • the adhesive force is practically determined in relation to the strip width, ie it is a strip according to the invention, for example with the structure: Sealing layer / pressure sensitive adhesive layer // Sealing layer pulled apart and determines the force that is required for this.
  • the determination is carried out in a composite adhesion tester and corresponds to DIN standard 53 357, method B.
  • the bond strength should be less than or equal to 10 Newton with a strip width of 15 mm.
  • the lower limit for the sensible manner to be set adhesive force of the pressure-sensitive adhesive results from the application of the film packaging. If hardly any external forces can act on the package, a lower adhesive force is sufficient. If, for example, it is to be expected during transport and storage that pressure is exerted on the packaging, the adhesive force must be greater so that the sealed seam can not burst with the adhesive. For most applications, adhesive forces between 5 and 10 N / 15 mm strip width will suffice.
  • the pressure-sensitive adhesive layer are also known as such adhesive materials, in particular the pressure-sensitive permanent adhesives, such as hotmelts, e.g. on the basis of styrene / butadiene block copolymers or styrene / isoprene / butadiene block copolymers or as UV-crosslinking hotmelts or as pressure-sensitive adhesives based on dispersions (eg acrylic resins or natural or synthetic rubber) are currently available for dispersion adhesives acrylic acid and / or Methacrylic acid copolymers, in particular acrylic acid and / or methacrylic acid-styrene copolymers are preferred.
  • the pressure-sensitive permanent adhesives such as hotmelts, e.g. on the basis of styrene / butadiene block copolymers or styrene / isoprene / butadiene block copolymers or as UV-crosslinking hotmelts or as pressure-sensitive adhesives
  • the sealing layers in particular at least the sealing layer directly adjacent to the pressure-sensitive adhesive from one side, preferably consists of olefinic homopolymers or copolymers, more preferably of LDPE, HDPE, LLDPE, m-PE, ethylene / vinyl acetate copolymer, polypropylene homo- or copolymers , Polyester homo- or copolymers or mixtures with or from the polymers mentioned.
  • the two sealing layers present in the strip can be of the same or different composition and / or composition.
  • a (tear-resistant) carrier layer is provided between the pressure-sensitive adhesive layer and a sealing layer.
  • This carrier layer serves the mechanical stability of the strip.
  • a relatively stiff material is chosen so as to increase the stiffness of the entire strip, which still has the rolling properties of the strip during processing can increase. This is achieved in particular by thin, stretched films, so that the carrier film is preferably a bi- or monoaxially oriented film of polypropylene (PP), polyethylene terephthalate (PET) or polyamide (PA) or of mixtures formed with or between these polymers (as base polymers) or copolymers.
  • the sealing layer can also be coextruded in a multilayered manner and contain a sealing layer on both sides outside and at least one functional layer on the inside.
  • it may be a stiffening and / or barrier layer, which may for example consist of EVOH.
  • Such layers are known in the art and are also referred to as "seal barriers".
  • the pressure-sensitive adhesive layer should have a thickness of 5 to 30 ⁇ m, preferably 10 to 20 ⁇ m, particularly preferably 10 to 15 ⁇ m. At least the sealing layers adjacent to the pressure-sensitive adhesive layer should preferably have a thickness of 20 to 50 ⁇ m, more preferably 20 to 30 ⁇ m.
  • the specified sealing layer thickness ensures that sealing pressure and sealing time can be set so that the sealing layer is only fused to such an extent that the adhesive layer is not subjected to thermal stress too much. It is presently considered preferable if the pressure-sensitive adhesive layer is thinner than the adjacent sealant layer.
  • the inventive sealing strip preferably has a thickness of 50 to 150 .mu.m, wherein the thickness of the pressure-sensitive adhesive layer is less than one third of the total thickness and the internal pressure-sensitive adhesive layer is spaced from the surfaces of the sealing strip by at least a quarter of the total thickness.
  • the strip will be made up as a roll material running several hundred meters, preferably> 1000 m, with a substantially uniform width of 10 to 20 mm.
  • the sealing strip is produced in such a way that a film web with the desired layer sequence is cut into strips. This also ensures that the contact surface between the layers is full-surface and not the adhesive strip of both sealing layers is enclosed at the edge, which would affect the functionality of the strip.
  • the sealing strip can be produced by applying an adhesive resin by hot extrusion and thus connecting the films involved.
  • Another possibility is to apply the adhesive layer hot on a stretched carrier film and to calender the other layer.
  • sealing strip is produced by applying the adhesive as a solution or aqueous dispersion to a carrier web, to dry and then to connect with the other layer.
  • a lamination can be carried out with a low-viscosity UV-crosslinkable self-adhesive which is crosslinked by the UV radiation before or during the processing process.
  • the above-described sealing strip according to the invention is intended for use in the manufacture of a reclosable film package, within a sealed seam which would be a permanent, non-peelable seam without the strip.
  • a film package in particular a film tube bag, with at least one sealed seam, which is provided for opening and re-closing of the package and in which in the sealed seam along the sealing direction provided on both sides with a sealing film strip after the Invention is sealed.
  • the package may have on the side facing away from the closed bag volume side of the seal provided for opening a, for example, tab-shaped rupture aid or a seam projection to facilitate the tearing of the seam and thus of the bag.
  • the seam provided for tearing can be a top seam or transverse seam of a tubular bag, but also a tubular bag longitudinal seam, in particular a fin seam.
  • a tear-open would be recommended.
  • the invention also encompasses a method for producing a film tubular bag which can be resealed after opening a sealing seam provided for this purpose, wherein the tubular film bag is produced in a manner known per se and a sealing strip according to the invention is inserted during the sealing of at least one sealed seam provided for opening and reclosing the package.
  • the production of the film tubular bag is done in a continuous process in which at least one film web runs off a roll and the sealing strip is fed from a separate roll or spool continuously at the speed of the film web or runs off the reel or spool.
  • the seam provided for opening may be a fin seam or an a / b seam, ie such a seam, in which - with respect to the finished bag - a film area with its inner or lower side (b) on an outer or upper side ( a) is sealed.
  • a projection is present at the seam, which serves as a handle and facilitates the user tearing.
  • the sealing seam provided for opening and reclosing can also be formed as a blind seam, which is exposed for opening by the consumer with a pair of scissors or with a tear strip optionally applied during the packaging process. A removal of the contents and subsequent resealing of the pack is thus possible.
  • a pressure-sensitive adhesive As a pressure-sensitive adhesive, a commercially available hot-melt adhesive has been used on the basis of a SBS block copolymer (for example SBS block copolymer / resin mixture LUNAMELT ®; HB Fuller GmbH, Luneburg).
  • SBS block copolymer for example SBS block copolymer / resin mixture LUNAMELT ®; HB Fuller GmbH, Luneburg.
  • other pressure sensitive adhesives can be used, for example based on thermoplastic synthetic rubber (eg INDAMELT ®). It is advantageous if the pressure-sensitive adhesive is stable to processing at elevated temperature, for example between 100 and 120 ° C.
  • Bonding is understood to mean the maximum value of the force necessary to sever the test strip in 15 mm width to a length of 10 mm at a separation angle of 90 ° (mechanical) splitting.
  • the bond strength (here KF for bond strength, SF for seal strength) is given in Newton (N), the strip width is added as an index (eg N / 15 mm).
  • the take-off speed is 100 mm / min.
  • Example II.1) the example is not according to the invention with respect to the sealing strip
  • a sealing strip is partially sealed on the packaging machine in front of the forming shoulder transversely to the film orientation. This happens rapportody in the area of the later top seam.
  • the propylene / ethylene copolymers are equipped with the usual antiblocking agents and lubricants and are similar to those used in BOPP production.
  • the pressure-sensitive adhesive used is a mixture of SBS block polymers with an aliphatic hydrocarbon resin and other resins and oils, as well as antioxidants and stabilizers.
  • the viscosity at 175 ° C according to DIN 53018, Brookfield, Sp. 27 is> 9000 mPa.s.
  • the length of the sealing strip required for the top seam is cut off from the spool on the packaging machine and sealed as described.
  • the result is a tubular bag, in which the sealing strip is in the sealed seam.
  • Example II.2) the example is not according to the invention with respect to the sealing strip
  • the preparation takes place by laminating the longitudinally stretched polypropylene with a blown film by means of pressure-sensitive adhesive.
  • the illustration 1 shows a generally designated 10 tubular bag with two transverse or head seams 1 and a longitudinal or back seam 2, which is designed here as a fin seal in b / b seal.
  • the upper b / b-sealed transverse seam is generally referred to as the top seam 1 'and the bottom transverse seam as the bottom seam 1 " laterally intermittently feeding unwinding is introduced.
  • the sealing strip 3 is sealed in the bag head seam 1 'so that the sealing strip 3 projects beyond the sealing seam in its width, but remains completely covered by the bag film.
  • the seam 1 ' is thus narrower here than the sealing strip 3.
  • the bottom seam 1 " which does not contain a sealing strip 3, can be made wider, but the head and bottom seams can also be made the same width.
  • top seam 1 'another top seam 1a with b / b seal is located above the top seam 1 'another top seam 1a with b / b seal.
  • This can be formed corresponding to the bottom seam 1 "wider than the now inner top seam 1 '
  • the back seam is therefore formed in this example with overlap of the film web edges as a / b-seam 2a, to allow easier tearing or cutting of the outer top seam 1a.
  • the Figure 2 shows a fabricated on a horizontal bag machine tubular bag with retracted gusset and sealing strips in a laterally offset back seam.
  • the Figure 2a shows a schematic perspective view of the total again designated 10 tubular bag.
  • an inserted side gusset 5 is formed on one side of the sealing seams 1 (head and bottom seam), which are b / b-sealed.
  • This gusset is used in use of the bag as retracted bag bottom (bottom fold) to give the bag volume or possibly stability.
  • the back seam 2 is a fin seam in b / b-seal.
  • the sealing strip 3 is allowed to run into the back seam 2 during its sealing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Bag Frames (AREA)

Abstract

The sealing strip (3) for production of reclosable multilayer foil packaging units (10) comprises an adhesive layer (3a) whose adhesive strength is lower than the sealing strength of the sealing material. Independent claims are also included for: (A) an application of the proposed sealing strip for production of reclosable foil packaging units; (B) a reclosable foil packaging unit; (C) a method for producing such packaging units.

Description

Die Erfindung betrifft einen Siegelstreifen für die Herstellung einer mit Hilfe eines integrierten Haftklebstoffs nach Aufreißen wiederverschließbaren Siegelnaht an einer Folienverpackung, dessen Verwendung für die Herstellung von Folienverpackungen, sowie eine Folienverpackung, insbesondere einen Folienschlauchbeutel, mit wenigstens einer den Siegelstreifen enthaltenden Siegelnaht und ein zugehöriges Herstellungsverfahren.The invention relates to a sealing strip for the production of a sealable by means of an integrated pressure-sensitive adhesive after tearing seal on a film packaging, its use for the production of film packaging, and a film packaging, in particular a film tube bag, with at least one sealing strip containing the sealing strip and an associated manufacturing method.

Folienverpackungen haben industriell vielfältige Anwendung gefunden, weil sie leicht, hygienisch und flüssigkeitsdicht sind, ggf. auch gasdicht. Außerdem ist es möglich, die Folienverpackungen optisch ansprechend zu gestalten und zu bedrucken. Ein häufig empfundener Nachteil von Folienverpackungen liegt darin, dass eine rundum fest verschlossene Verpackung schwer zu öffnen sein kann und häufig unvorhersehbar in ungewollter Weise reißt, wobei die Verpackung vollständig zerstört wird. Dieser Nachteil wird dann zum Problem, wenn die Verpackung zur weiteren Aufbewahrung des Inhalts oder von Inhaltsresten noch benötigt wird.Film packaging has found industrially diverse application because they are lightweight, hygienic and liquid-tight, possibly also gas-tight. It is also possible to make the film packaging visually appealing and to print. A common perceived disadvantage of film packaging is that a tightly sealed package can be difficult to open and often unpredictably ruptures in an undesired manner, completely destroying the package. This disadvantage becomes a problem if the packaging is still needed for further storage of the contents or residual contents.

Folienverpackungen werden häufig durch Heißsiegelnähte verbunden. Dabei trägt das Folienverpackungsmaterial wenigstens einseitig eine aufschmelzbare Oberflächenschicht, so dass z.B. zwei mit einer derartigen Siegelschicht ausgerüstete und gegeneinander gelegte Folienbahnen oder -abschnitte mit einem Siegelwerkzeug punktgenau verschweißt, d.h. gesiegelt, werden können. Derartige Siegelschichten können so fest versiegelt sein, dass ein Öffnen der Naht praktisch nicht mehr möglich ist, da zuvor die Verpackungsfolie selbst zerreißen wird.Film packages are often joined by heat sealing seams. The film packaging material carries at least one side of a fusible surface layer, so that e.g. two provided with such a sealing layer and against each other laid film webs or sections with a sealing tool accurately welded, i. sealed, can be. Such sealing layers can be sealed tightly so that opening of the seam is practically no longer possible since previously the packaging film itself will rupture.

Um Folienverpackungen zerstörungsfrei öffnen zu können, wurden Siegelschichtmaterialien entwickelt, die zwar einen sicheren Verschluss der Verpackung gewährleisten, die jedoch durch Zugkräfte, die kleiner sind als zum Zerreißen der Basisfolie erforderlich, von einander gelöst, d.h. abgezogen werden können. Derartige Siegelschichten und -nähte werden in der Fachsprache auch als "peelfähig" bezeichnet. Aus der EP 1 074 477 ist es auch bereits bekannt, eine peelfähige Siegelnaht durch Einlegen eines peelfähigen Folienstreifens zu erzeugen.In order to be able to open film packaging nondestructively, sealing layer materials have been developed, which, while ensuring a secure closure of the packaging, but by tensile forces that are smaller than required for tearing the base film, detached from each other, ie can be deducted. Such sealing layers and seams are also referred to in the jargon as "peelable". From the EP 1 074 477 It is also already known to produce a peelable sealed seam by inserting a peelable film strip.

Peelfähige Siegelnähte haben allerdings den Nachteil, dass die Verpackung sauber und zerstörungsfrei geöffnet, jedoch nicht wieder verschlossen werden kann. Eine Möglichkeit, den Inhalt der Verpackung weiter zu schützen, besteht darin, die Verpackung mit einem Haftklebestreifen wieder zu verschließen. Der teilweise mit Schutzfolie (Releasefolie oder -papier) abgedeckte Haftstreifen kann bereits an der noch geschlossenen Verpackung vorgehalten werden; zugehörige Beispiele sind u.a. von Tabaksbeuteln bekannt. Nachteilig ist jedoch, dass das verpackte Gut im Allgemeinen nicht so vollständig, z.B. auch luftdicht, geschützt ist, wie dies wünschenswert wäre.However, peelable sealing seams have the disadvantage that the packaging can be opened neatly and non-destructively, but can not be closed again. One way to further protect the contents of the package is to reseal the package with a pressure-sensitive adhesive strip. The adhesive strip, which is partially covered with protective film (release film or paper), can already be stored on the still closed packaging; associated examples are i.a. known from tobacco pouches. The disadvantage, however, is that the packaged good is generally not so complete, e.g. also airtight, protected as would be desirable.

Eine andere elegante Lösung für den Wiederverschluss wurde darin gesehen, den Haftklebstoffstreifen quasi in die Verpackungsfolie zu integrieren und beispielsweise die Verpackungsfolie selbst mit einer freilegbaren voll- oder teilflächigen Haftklebstoffschicht auszurüsten. Die Integration des Haftklebstoffs kann jedoch auch so erfolgen, dass ein Folienstreifen, bei dem die Haftklebstoffschicht beidseitig abgedeckt ist auf die Verpackungsfolie aufgebracht oder bei der Herstellung einer Verpackung mit eingebracht wird. Der Wiederverschluss von Folienverpackungen mit Hilfe von Haftklebstoff enthaltenden mehrschichtigen Folienstreifen ist im Stand der Technik daher grundsätzlich bekannt.Another elegant solution for reclosing was seen to be to integrate the pressure-sensitive adhesive strip virtually into the packaging film and, for example, to equip the packaging film itself with an exposable full or partial pressure-sensitive adhesive layer. However, the integration of the pressure-sensitive adhesive can also take place in such a way that a film strip in which the pressure-sensitive adhesive layer is covered on both sides is applied to the packaging film or introduced during the production of a packaging. The reclosure of film packaging by means of pressure-sensitive adhesive-containing multilayer film strips is therefore basically known in the prior art.

So offenbart die DE 101 09 209 A1 einen Kunststofffolienbeutel, der mit einem in einer Verschlusszone applizierten mehrschichtigen Folienstreifen verschlossen wird. Der Folienstreifen besteht aus einer Trägerschicht, die mit dem Folienmaterial des Kunststoff-Folienbeutels in einem ersten Folienabschnitt des Verschlussbereichs verschweißt ist, einer Haftklebstoffschicht über der Trägerschicht und einer Siegelschicht, die die Haftklebstoff-Schicht überzieht und an dem gegenüberliegenden Folienabschnitt des Folienbeutels über einen Teil der Streifenbreite angesiegelt wird.So revealed the DE 101 09 209 A1 a plastic film bag, which is closed with a applied in a closure zone multilayer film strip. The film strip consists of a carrier layer, which is welded to the film material of the plastic film bag in a first film section of the closure region, a pressure-sensitive adhesive layer over the carrier layer and a sealing layer, which covers the pressure-sensitive adhesive layer and on the opposite film section of the film bag over a portion of Strip width is sealed.

Entsprechende Streifen sind auch aus der WO 96/40504 oder der FR 2783512 bekannt.Corresponding stripes are also from the WO 96/40504 or the FR 2783512 known.

Bei den im Stande der Technik bekannten haftklebstoffhaltigen Siegelstreifen wird innerhalb des Streifens ein Sollrissbereich erzeugt, der das Öffnen der Siegelnaht ermöglicht und gleichzeitig den Haftklebstoff freilegt. Hierfür ist vorgesehen, dass eine spröde eingestellte reißfähige Schicht, beispielsweise aus einem lonomer in unmittelbarer Nachbarschaft zur Haftklebeschicht vorhanden ist, oder dass die an die Haftklebeschicht angrenzende Siegelschicht selbst spröde eingestellt ist, um an dieser Stelle ein Reißen des Streifens in sich zu ermöglichen, wie dies z.B. in der WO 96/40504 oder in der DE 101 09 209 genauer beschrieben ist.In the pressure-sensitive adhesive-containing sealing strips known in the prior art, a predetermined crack region is created within the strip, which opens the sealed seam while exposing the pressure-sensitive adhesive. For this purpose it is provided that a brittle set tear-resistant layer, for example of an ionomer in the immediate vicinity of the pressure-sensitive adhesive layer is present, or that the adhesive layer adjacent to the sealing layer itself is set brittle to allow at this point tearing of the strip in itself, such as this eg in the WO 96/40504 or in the DE 101 09 209 is described in more detail.

Die Ergebnisse, die mit den bisher bekannten haftklebstoffhaltigen Siegelstreifen erzielt werden können, sind unbefriedigend. Da grundsätzlich ein Reißen an einer Sollrissstelle innerhalb oder an einer spröden Schicht vorgesehen ist, besteht die Möglichkeit, dass der Rissverlauf ungleichmäßig ist, dass ausfransende Risskanten entstehen, die zwischen den wieder zu verschließenden Flächen als Abstandshalter wirken, oder dass Reste der spröden reißfähigen Schichten in Form kleiner Fetzen auf der Haftklebeschicht verbleiben und die Haftung nachhaltig behindern.The results that can be achieved with the previously known pressure-sensitive adhesive sealing strips are unsatisfactory. In principle, since cracking is provided at a predetermined crack site within or on a brittle layer, there is the possibility that the crack course is uneven, that fraying crack edges are formed, which act as spacers between the surfaces to be resealed, or that remnants of the brittle tearable layers in FIG Form of small shreds remain on the pressure-sensitive adhesive layer and hinder the adhesion lasting.

Die WO 00/58167 A offenbart einen dreischichtigen Siegelstreifen der Schichtfolge Siegelschicht-Haftklebstoffschicht-Siegelschicht, der in eine Folienverpackung bei deren Herstellung beidseitig eingesiegelt wird. Man erhält eine Verbindungsnaht, die mit Hilfe des Haftklebstoffs geöffnet und wieder verschlossen werden kann.The WO 00/58167 A discloses a three-layer sealing strip of the layer sequence sealing layer pressure-sensitive adhesive layer sealing layer, which is sealed on both sides in a foil packaging during their production. A connecting seam is obtained which can be opened and closed again with the aid of the pressure-sensitive adhesive.

Die Aufgabe der Erfindung besteht daher darin, eine Heißsiegelnaht an einer Folienverpackung, insbesondere einem Folienbeutel, die einen innenliegenden Haftklebstoff umfasst und die sich an einer Position befindet, an der die Verpackung geöffnet werden soll, so auszubilden, dass die Verpackung durch Lösen der Naht möglichst unversehrt und in jedem Fall zerstörungsfrei geöffnet und hernach mit Hilfe des innerhalb der Naht bereitgestellten Haftklebstoffs wieder verschlossen werden kann.The object of the invention is thus to form a heat-sealed seam on a film package, in particular a film bag, which comprises an internal pressure-sensitive adhesive and which is located at a position at which the package is to be opened, so that the package as possible by loosening the seam undamaged and, in any case, opened nondestructively and then can be closed again with the help of the provided within the seam pressure-sensitive adhesive.

Zur Lösung dieser Aufgabe sieht die Erfindung zunächst einen Siegelstreifen gemäß Anspruch 1 vor, der in eine Heißsiegelnaht eingelegt werden kann und so die angestrebten Verpackungseigenschaften an der Naht ermöglicht.To achieve this object, the invention initially provides a sealing strip according to claim 1, which can be inserted into a heat seal seam and thus enables the desired packaging properties at the seam.

Der erfindungsgemäße Siegelstreifen für die Herstellung einer mit Hilfe eines integrierten Haftklebstoffs nach Aufreißen wiederverschließbarenThe sealing strip according to the invention for the production of a resealable by means of an integrated pressure-sensitive adhesive after tearing open

Siegelnaht an einer Folienverpackung ist mehrschichtig ausgebildet und besitzt eine innen liegende Haftklebstoffschicht sowie an beiden Außenflächen je eine Siegelschicht, wobei der Siegelstreifen die Schichtfolge: Siegelschicht/Haftklebstoffschicht/reißfeste Trägerschicht aus einer bi- oder monoaxial orientierten Folie aus Polypropylen (PP), Polyethyleneterephtalat (PET) oder Polymid (PA) oder aus mit oder zwischen diesen Polymeren gebildeten Mischungen oder Copolymeren/Siegelschicht aufweist, wobei die Haftklebstoffschicht zu einer der außenliegenden Siegelschichten und der Trägerschicht in direktem vollflächigen Kontakt steht und die Eigenschaften der Haftklebstoffschicht und der Siegelschichten so aufeinander abgestimmt sind, dass keine der Schichten außer der Haftklebstoffschicht eine in der Weise reißfähige Schicht ist, dass sie einen Sollrissbereich innerhalb einer Schicht des Streifens vorgibt und dass der in Anwendungsposition beidseitig eingesiegelte Streifen innerhalb der Klebstoffschicht oder an der Kontaktfläche der Haftklebstoffschicht zu einer angrenzenden Schicht aufreißt, indem die Klebkraft de Haftklebstoffschicht kleiner gleich 10 N/15 mm Streifenbreite beträgt und die Siegelfestigkeit größer als die Klebkraft ist.Sealing seam on a film packaging is multi-layered and has an internal pressure-sensitive adhesive layer and on both outer surfaces each have a sealing layer, wherein the sealing strip, the layer sequence: sealing layer / pressure-sensitive adhesive layer / tear-resistant carrier layer of a bi- or monoaxially oriented film of polypropylene (PP), polyethylene terephthalate (PET ) or polyimide (PA) or from mixtures or copolymers / sealing layer formed with or between these polymers, the pressure-sensitive adhesive layer being in direct contact over the entire surface with the outer sealing layers and the carrier layer and the properties of the pressure-sensitive adhesive layer and the sealing layers being matched to one another, that none of the layers other than the pressure-sensitive adhesive layer is a tear-able layer to give a predetermined cracking area within a layer of the strip, and that the double-sided sealed strip in the application position is intrinsic the adhesive layer or at the contact surface of the pressure-sensitive adhesive layer tears to an adjacent layer in that the adhesive force of pressure-sensitive adhesive layer is equal to 10 N / 15 mm strip width and the seal strength is greater than the bond strength.

Hierdurch wird der in Anwendungsposition beidseitig eingesiegelte Streifen innerhalb der Haftklebstoffschicht oder an der Kontaktfläche der Haftklebstoffschicht zu einer angrenzenden Siegelschicht aufreißen. In jedem Falle wird eine vollflächig klebfähige Haftklebstoffschicht aufgedeckt werden, während die Siegelschichten des Siegelstreifens durch ihre größere Siegelfestigkeit ebenfalls über ihre ganze Fläche fest mit dem Verpackungsmaterial verbunden bleiben. Unsaubere oder ausgefranste Risse oder gedehnte Folienbereiche, die die Beutelform und den Wiederverschluss beeinträchtigen, werden sicher vermieden.As a result, the double-sided sealed strip in the application position will rupture within the pressure-sensitive adhesive layer or at the contact surface of the pressure-sensitive adhesive layer to form an adjacent sealing layer. In any case, a fully adhesive adhesive layer will be revealed, while the sealing layers of the sealing strip also remain firmly bonded to the packaging material over their entire surface due to their greater sealing strength. Unclean or frayed cracks or stretched film areas that affect the bag shape and reclosure are safely avoided.

Der Erfindung liegt die Erkenntnis zugrunde, dass es nicht erforderlich ist, wie im Stand der Technik bisher allgemein angenommen, dass die Klebkraft der Haftklebstoff-Schicht größer als die Reißfestigkeit einer der Siegelschichten sein muss, die durch ihre Sprödigkeit und Reißfähigkeit das Öffnen der Verpackung ermöglichen und gleichzeitig den Klebstoff freilegen sollte. Vielmehr konnten im Zuge der Erfindung viel bessere Ergebnisse erzielt werden, wenn die Klebkraft (Adhäsionskraft zu einer angrenzenden Oberfläche oder Cohäsionskraft) der Haftklebstoffschicht zwar groß genug ist, um einen verhältnismäßig festen Wiederverschluss der Verpackung sicherzustellen, wenn jedoch vor allem die Siegelfestigkeit wie auch die Reißfestigkeit der angrenzenden Siegelschicht oder Siegelschichten größer, vorzugsweise deutlich größer, als die Klebkraft der Haftklebstoffschicht ist.The invention is based on the finding that it is not necessary, as has hitherto generally been assumed in the prior art, that the adhesive force of the pressure-sensitive adhesive layer must be greater than the tear strength of one of the sealing layers, which make it possible to open the packaging due to their brittleness and tear strength and at the same time expose the adhesive. Rather, in the course of the invention, much better results could be achieved if the adhesive force (adhesive force to an adjacent surface or cohesive force) of the pressure-sensitive adhesive layer is large enough to ensure a relatively tight reclosure of the package, but above all the seal strength as well as the tear strength the adjacent sealing layer or sealing layers larger, preferably significantly greater than the adhesive force of the pressure-sensitive adhesive layer.

Vorzugsweise ist die Siegelfestigkeit wenigstens der an den Haftklebstoff angrenzenden Siegelschicht mehr als doppelt so groß wie die Klebkraft des Haftklebstoffs.Preferably, the seal strength of at least the sealant layer adjacent to the pressure sensitive adhesive is more than twice the adhesive force of the pressure sensitive adhesive.

Die Klebkraft kann je nach Klebstoffart die Kraft einer Adhäsion des Klebstoffs an einer ebenen Oberfläche oder eine Kohäsionskraft innerhalb des Klebstoffs selbst sein. Vorzugsweise ist der für die Erfindung verwendete Haftklebstoff ein zu Kohäsionsbruch neigender Haftklebstoff. Diese Eigenschaft kann klebstofftechnisch eingestellt werden.The adhesive force may be the force of adhesion of the adhesive to a planar surface or cohesive force within the adhesive itself, depending on the type of adhesive. Preferably, the pressure-sensitive adhesive used in the invention is a cohesive-fracture-prone adhesive. This property can be adjusted by adhesive technology.

Praktisch bestimmt wird die Klebkraft in Relation zur Streifenbreite, d.h. es wird ein erfindungsgemäßer Streifen, beispielsweise mit dem Aufbau: Siegelschicht/Haftklebstoffschicht//Siegelschicht auseinandergezogen und die Kraft bestimmt, die hierfür erforderlich ist. Die Bestimmung erfolgt in einem Verbundhaftungsprüfgerät und entspricht DIN-Norm 53 357, Verfahren B. Die Klebkraft soll kleiner oder gleich 10 Newton bei 15 mm Streifenbreite sein.The adhesive force is practically determined in relation to the strip width, ie it is a strip according to the invention, for example with the structure: Sealing layer / pressure sensitive adhesive layer // Sealing layer pulled apart and determines the force that is required for this. The determination is carried out in a composite adhesion tester and corresponds to DIN standard 53 357, method B. The bond strength should be less than or equal to 10 Newton with a strip width of 15 mm.

Die Untergrenze für die sinnvoller Weise einzustellende Klebkraft des Haftklebstoffs ergibt sich aus dem Anwendungszweck der Folienverpackung. Falls kaum äußere Kräfte auf die Packung wirken können, genügt eine geringere Haftkraft. Ist beispielsweise bei Transport und Lagerung damit zu rechnen, dass Druck auf die Verpackung ausgeübt wird, muss die Haftkraft größer sein, damit die Siegelnaht mit dem Haftstoff nicht platzen kann. Für die meisten Anwendungsfälle werden Haftkräfte zwischen 5 und 10 N/15 mm Streifenbreite ausreichen.The lower limit for the sensible manner to be set adhesive force of the pressure-sensitive adhesive results from the application of the film packaging. If hardly any external forces can act on the package, a lower adhesive force is sufficient. If, for example, it is to be expected during transport and storage that pressure is exerted on the packaging, the adhesive force must be greater so that the sealed seam can not burst with the adhesive. For most applications, adhesive forces between 5 and 10 N / 15 mm strip width will suffice.

Für die Haftklebstoffschicht stehen die ebenfalls als solche bekannten Klebematerialien, insbesondere die druckempfindlichen Permanentklebstoffe, wie Hotmelts, z.B. auf Basis von Styrol/Butadien-Blockcopolymeren oder Styrol/Isopren/Butadien-Blockcopolymeren oder wie UV-vernetzende Warmmelts oder wie Haftklebstoffe auf Basis von Dispersionen (z.B. Acrylharzen oder Natur- oder Synthesekautschuk) zur Verfügung, wobei derzeit für Dispersionshaftklebestoffe Acrylsäure- und/oder Methacrylsäure-Copolymerisate, insbesondere Acrylsäure-und/oder Methacrylsäure-Styrol-Copolymerisate bevorzugt sind.For the pressure-sensitive adhesive layer are also known as such adhesive materials, in particular the pressure-sensitive permanent adhesives, such as hotmelts, e.g. on the basis of styrene / butadiene block copolymers or styrene / isoprene / butadiene block copolymers or as UV-crosslinking hotmelts or as pressure-sensitive adhesives based on dispersions (eg acrylic resins or natural or synthetic rubber) are currently available for dispersion adhesives acrylic acid and / or Methacrylic acid copolymers, in particular acrylic acid and / or methacrylic acid-styrene copolymers are preferred.

Die Siegelschichten, insbesondere wenigstens die an den Haftklebstoff von einer Seite direkt angrenzende Siegelschicht, besteht vorzugsweise aus olefinischen Homo- oder Copolymeren, weiter vorzugsweise aus LDPE, HDPE, LLDPE, m-PE, Ethylen/Vinylacetat-Copolymer, Polypropylen-Homo- oder Copolymeren, Polyester-Homo- oder Copolymeren oder Mischungen mit oder aus den genannten Polymeren. die beiden in dem Streifen vorhandenen Siegelschichten können gleich oder verschieden aufgebaut und/oder zusammengesetzt sein.The sealing layers, in particular at least the sealing layer directly adjacent to the pressure-sensitive adhesive from one side, preferably consists of olefinic homopolymers or copolymers, more preferably of LDPE, HDPE, LLDPE, m-PE, ethylene / vinyl acetate copolymer, polypropylene homo- or copolymers , Polyester homo- or copolymers or mixtures with or from the polymers mentioned. the two sealing layers present in the strip can be of the same or different composition and / or composition.

Zwischen Haftklebstoffschicht und einer Siegelschicht ist eine (reißfeste) Trägerschicht vorgesehen. Diese Trägerschicht dient der mechanischen Stabilität des Streifens. Es wird ein relativ steifes Material gewählt, um so die Steifigkeit des ganzen Streifens zu erhöhen, was die Abrolleigenschaften des Streifens bei der Verarbeitung noch erhöhen kann. Besonders wird dies durch dünne, gereckte Folien erreicht, so dass die Trägerfolie vorzugsweise eine bi- oder monoaxial orientierte Folie aus Polypropylen (PP), Polyethylenterephthalat (PET) oder Polyamid (PA) oder aus mit oder zwischen diesen Polymeren (als Basispolymeren) gebildeten Mischungen oder Copolymeren sein kann.Between the pressure-sensitive adhesive layer and a sealing layer, a (tear-resistant) carrier layer is provided. This carrier layer serves the mechanical stability of the strip. A relatively stiff material is chosen so as to increase the stiffness of the entire strip, which still has the rolling properties of the strip during processing can increase. This is achieved in particular by thin, stretched films, so that the carrier film is preferably a bi- or monoaxially oriented film of polypropylene (PP), polyethylene terephthalate (PET) or polyamide (PA) or of mixtures formed with or between these polymers (as base polymers) or copolymers.

Die Siegelschicht kann auch mehrschichtig coextrudiert sein und beidseitig außen eine Siegelschicht und innen liegend wenigstens eine Funktionsschicht enthalten. Besonders kann es sich dabei um eine Versteifungs- und/oder Sperrschicht handeln, die beispielsweise aus EVOH bestehen kann. Derartige Schichten sind im Stand der Technik bekannt und werden auch als "Siegelsperrschichten" bezeichnet.The sealing layer can also be coextruded in a multilayered manner and contain a sealing layer on both sides outside and at least one functional layer on the inside. In particular, it may be a stiffening and / or barrier layer, which may for example consist of EVOH. Such layers are known in the art and are also referred to as "seal barriers".

Die Haftklebstoffschicht sollte eine Dicke von 5 bis 30 µm, vorzugsweise 10 bis 20 µm, besonders bevorzugt 10 bis 15 µm besitzen. Zumindest die an die Haftklebstoffschicht angrenzenden Siegelschichten sollten vorzugsweise eine Dicke von 20 bis 50 µm, weiter bevorzugt 20 bis 30 µm besitzen. Die angegebene Siegelschichtdicke stellt sicher, dass Siegeldruck und Siegeldauer sich so einstellen lassen, dass die Siegelschicht nur so weit angeschmolzen wird, dass die Klebstoffschicht thermisch nicht zu sehr belastet wird. Es wird derzeit als bevorzugt angesehen, wenn die Haftklebstoffschicht dünner als die angrenzende Siegelschicht ist.The pressure-sensitive adhesive layer should have a thickness of 5 to 30 μm, preferably 10 to 20 μm, particularly preferably 10 to 15 μm. At least the sealing layers adjacent to the pressure-sensitive adhesive layer should preferably have a thickness of 20 to 50 μm, more preferably 20 to 30 μm. The specified sealing layer thickness ensures that sealing pressure and sealing time can be set so that the sealing layer is only fused to such an extent that the adhesive layer is not subjected to thermal stress too much. It is presently considered preferable if the pressure-sensitive adhesive layer is thinner than the adjacent sealant layer.

Insgesamt besitzt der erfindungsgemäße Siegelstreifen vorzugsweise eine Dicke von 50 bis 150 µm, wobei die Dicke der Haftklebstoffschicht weniger als ein Drittel der Gesamtdicke beträgt und die innen liegende Haftklebstoffschicht um mindestens ein Viertel der Gesamtdicke von den Oberflächen des Siegelstreifens beabstandet ist.Overall, the inventive sealing strip preferably has a thickness of 50 to 150 .mu.m, wherein the thickness of the pressure-sensitive adhesive layer is less than one third of the total thickness and the internal pressure-sensitive adhesive layer is spaced from the surfaces of the sealing strip by at least a quarter of the total thickness.

Im Allgemeinen wird der Streifen als mehrere hundert Meter, vorzugsweise > 1000 m lang laufendes Rollenmaterial mit einer im Wesentlichen gleichmäßigen Breite von 10 bis 20 mm konfektioniert sein. Der Siegelstreifen wird so hergestellt, dass eine Folienbahn mit der gewünschten Schichtfolge in Streifen geschnitten wird. Dies stellt auch sicher, dass die Kontaktfläche zwischen den Schichten vollflächig ist und nicht etwa der Haftstreifen von beiden Siegelschichten am Rande eingeschlossen wird, was die Funktionsfähigkeit des Streifens beeinträchtigen würde.In general, the strip will be made up as a roll material running several hundred meters, preferably> 1000 m, with a substantially uniform width of 10 to 20 mm. The sealing strip is produced in such a way that a film web with the desired layer sequence is cut into strips. This also ensures that the contact surface between the layers is full-surface and not the adhesive strip of both sealing layers is enclosed at the edge, which would affect the functionality of the strip.

Man kann den Siegelstreifen dadurch herstellen, dass man ein Klebeharz durch Heißextrusion aufbringt und damit die beteiligten Folien miteinander verbindet.The sealing strip can be produced by applying an adhesive resin by hot extrusion and thus connecting the films involved.

Eine andere Möglichkeit besteht darin, die Klebschicht heiß auf eine gereckte Trägerfolie aufzubringen und die andere Schicht aufzukalandrieren.Another possibility is to apply the adhesive layer hot on a stretched carrier film and to calender the other layer.

Weitere Möglichkeiten der Herstellung des Siegelstreifens bestehen darin, den Klebstoff als Lösung oder wässrige Dispersion auf eine Trägerbahn aufzutragen, zu trocknen und anschließend mit der anderen Lage zu verbinden.Other ways of producing the sealing strip are to apply the adhesive as a solution or aqueous dispersion to a carrier web, to dry and then to connect with the other layer.

Des Weiteren kann eine Kaschierung mit einer dünnflüssigen UV-vernetzbaren Selbstklebemasse durchgeführt werden, die vor oder während des Verarbeitungsprozesses durch die UV-Strahlung vernetzt wird.Furthermore, a lamination can be carried out with a low-viscosity UV-crosslinkable self-adhesive which is crosslinked by the UV radiation before or during the processing process.

In allen Fällen erfolgt nach der Herstellung der Folien ein Schnitt des Siegelstreifens auf die Anwendungsbreite.In all cases, after the production of the films, a cut of the sealing strip on the scope of application.

Der oben beschriebene erfindungsgemäße Siegelstreifen ist vorgesehen für die Verwendung bei der Herstellung einer wiederverschließbaren Folienverpackung, und zwar innerhalb einer Siegelnaht, die ohne den Streifen eine permanente, nicht peelfähige Naht wäre.The above-described sealing strip according to the invention is intended for use in the manufacture of a reclosable film package, within a sealed seam which would be a permanent, non-peelable seam without the strip.

Die Aufgabe der Erfindung wird demnach weiterhin gelöst durch eine Folienverpackung, insbesondere einen Folienschlauchbeutel, mit wenigstens einer Siegelnaht, die für das Öffnen und wieder Verschließen der Verpackung vorgesehen ist und bei der in die Siegelnaht entlang der Siegelrichtung ein beidseitig mit einer Siegelschicht versehener Folienstreifen nach der Erfindung eingesiegelt ist.The object of the invention is therefore further achieved by a film package, in particular a film tube bag, with at least one sealed seam, which is provided for opening and re-closing of the package and in which in the sealed seam along the sealing direction provided on both sides with a sealing film strip after the Invention is sealed.

Die Verpackung kann auf der von dem geschlossenen Beutelvolumen abgewandten Seite der zum Öffnen vorgesehenen Siegelnaht eine beispielsweise laschenförmige Aufreißhilfe oder einen Nahtüberstand aufweisen, um das Aufreißen der Naht und damit des Beutels zu erleichtern.The package may have on the side facing away from the closed bag volume side of the seal provided for opening a, for example, tab-shaped rupture aid or a seam projection to facilitate the tearing of the seam and thus of the bag.

Die zum Aufreißen vorgesehene Naht kann eine Kopfnaht oder Quernaht eines Schlauchbeutels sein, aber auch eine Schlauchbeutellängsnaht, insbesondere eine Flossennaht. Bei einer a/b-Längsnaht wäre eine Aufreißhilfe zu empfehlen.The seam provided for tearing can be a top seam or transverse seam of a tubular bag, but also a tubular bag longitudinal seam, in particular a fin seam. For a / b-lengthwise seam a tear-open would be recommended.

Es können auch mehrere Nähte zum Öffnen und damit zum Aufreißen vorgesehen sein, beispielsweise können zwei über Eck verlaufende Nähte zum Aufreißen beispielsweise eines rundum gesiegelten Beutels an einer Ecke mit dem erfindungsgemäßen Siegelstreifen versehen sein, und zwar entweder über die gesamte Nahtlänge oder wenigstens im Bereich dieser Ecke.It can also be provided several seams to open and thus tearing, for example, two corner seams for tearing, for example, an all-round bag sealed at one corner may be provided with the sealing strip according to the invention, either over the entire seam length or at least in the area Corner.

Die Erfindung umfasst auch ein Verfahren zur Herstellung eines nach Öffnen einer dafür vorgesehenen Siegelnaht wiederverschließbaren Folienschlauchbeutels, wobei der Folienschlauchbeutel in an sich bekannter Weise hergestellt wird und bei der Siegelung wenigstens einer für das Öffnen und Wiederverschließen der Verpackung vorgesehenen Siegelnaht ein erfindungsgemäßer Siegelstreifen eingelegt wird.The invention also encompasses a method for producing a film tubular bag which can be resealed after opening a sealing seam provided for this purpose, wherein the tubular film bag is produced in a manner known per se and a sealing strip according to the invention is inserted during the sealing of at least one sealed seam provided for opening and reclosing the package.

Vorzugsweise geschieht die Fertigung des Folienschlauchbeutels in einem kontinuierlichen Verfahren, bei dem wenigstens eine Folienbahn von einer Rolle abläuft und der Siegelstreifen von einer gesonderten Rolle oder Spule aus kontinuierlich mit der Geschwindigkeit der Folienbahn zugeführt wird oder von der Rolle oder Spule abläuft.Preferably, the production of the film tubular bag is done in a continuous process in which at least one film web runs off a roll and the sealing strip is fed from a separate roll or spool continuously at the speed of the film web or runs off the reel or spool.

Die für das Öffnen vorgesehene Siegelnaht kann eine Flossennaht oder eine a/b-Naht sein, d.h. eine solche Naht, bei der - bezogen auf den fertigen Beutel - ein Folienbereich mit seiner Innen- oder Unterseite (b) auf eine Außen- oder Oberseite (a) aufgesiegelt wird. Vorzugsweise ist an der Naht ein Überstand vorhanden, der als Anfasser dient und dem Benutzer das Aufreißen erleichtert. Die für das Öffnen und Wiederverschließen vorgesehene Siegelnaht kann auch als Blindnaht ausgebildet sein, die zum Öffnen vom Verbraucher mit einer Schere bzw. mit einem während des Verpackungsvorganges optional aufgebrachten Aufreißstreifens freigelegt wird. Eine Entnahme des Füllguts und anschließendes Wiederverschließens der Packung ist damit möglich.The seam provided for opening may be a fin seam or an a / b seam, ie such a seam, in which - with respect to the finished bag - a film area with its inner or lower side (b) on an outer or upper side ( a) is sealed. Preferably, a projection is present at the seam, which serves as a handle and facilitates the user tearing. The sealing seam provided for opening and reclosing can also be formed as a blind seam, which is exposed for opening by the consumer with a pair of scissors or with a tear strip optionally applied during the packaging process. A removal of the contents and subsequent resealing of the pack is thus possible.

BEISPIELEEXAMPLES

I) Nachfolgend werden Beispiele für die Schichtfolien erfindungsgemäßer Siegelstreifen angegeben.I) Examples of the layered films of sealing strips according to the invention are given below. Beispiel 1)Example 1)

  • 30 µm LDPE-Blasfolie30 μm LDPE blown film
  • 2 µm 2-komponentiger Polyurethan-Kaschierklebstoff2 μm 2-component polyurethane laminating adhesive
  • 12 µm biaxial orientiertes Polyethylenterephthalat12 μm biaxially oriented polyethylene terephthalate
  • 20µm Haftklebstoff20μm pressure sensitive adhesive
  • 25µm LPDE-Blasfolie
    Streifenbreite: 12mm, SF = 35 N/15mm, KF = 10 N/15mm    25μm LPDE blown film
    Strip width: 12mm, SF = 35 N / 15mm, KF = 10 N / 15mm
Beispiel 2)Example 2) a) klebstoffkaschierte Folie (Siegelschicht) aus:a) adhesive-laminated film (sealing layer) of:

  • 40 µm LPDE-Blasfolie40 μm LPDE blown film
  • 2µm 2-komponentiger Polyurethan-Kaschieklebstoff2μm 2-component polyurethane Kaschieklebstoff
  • 27µm monoxial orientiertes Polypropylen27 μm monoxially oriented polypropylene
b) 17µm Haftklebstoffb) 17μm pressure sensitive adhesive c) Coextrusions-Blasfolie (= modifziertes Siegelschicht) aus:c) Coextrusion Blown Film (= Modified Sieve Layer) of:

  • 10µm LDPE10μm LDPE
  • 2µm Haftvermittler2μm adhesion promoter
  • 3µm EVOH3μm EVOH
  • 2µm Haftvermittler2μm adhesion promoter
  • 10µm LDPE
    a), b) und c) verbunden durch Haftklebstoffkaschierung
    Streifenbreite: 10mm; SF = 30 N/15 mm; KF = 8 N/15 mm    10μm LDPE
    a), b) and c) connected by pressure-sensitive adhesive lamination
    Strip width: 10mm; SF = 30 N / 15 mm; KF = 8 N / 15 mm
Beispiel 3)Example 3) a) klebstoffkaschierte Folie (Siegelschicht) aus:a) adhesive-laminated film (sealing layer) of:

  • 30µm PP/PE-Copolymer,30μm PP / PE copolymer,
  • 36µm biaxial orientierter Polyester36μm biaxially oriented polyester
b) 10µm Haftklebstoffb) 10μm pressure sensitive adhesive c) 30µm PP/PE-Copolymer,c) 30 μm PP / PE copolymer,

a), b) und c) verbunden durch Haftklebstoffkaschierung
Streifenbreite; 15 mm; SF = 20 N/15 mm; KF = 10 N/15 mma), b) and c) connected by pressure-sensitive adhesive lamination
Strip width; 15 mm; SF = 20 N / 15 mm; KF = 10 N / 15 mm

Als Haftklebstoff wurde ein kommerziell erhältlicher Schmelzklebstoff auf Basis eines SBS-Block-Copolymer verwendet (z.B. SBS-Block-Copolymer/Harz-Mischung LUNAMELT®; H.B. Fuller GmbH, Lüneburg). Alternativ können andere Haftklebstoffe eingesetzt werden, z.B. auf Basis von thermoplastischem Synthesekautschuk (z.B. INDAMELT®). Es ist vorteilhaft, wenn der Haftklebstoff bei erhöhter Temperatur, beispielsweise zwischen 100 und 120 °C verarbeitungsstabil ist.As a pressure-sensitive adhesive, a commercially available hot-melt adhesive has been used on the basis of a SBS block copolymer (for example SBS block copolymer / resin mixture LUNAMELT ®; HB Fuller GmbH, Luneburg). Alternatively, other pressure sensitive adhesives can be used, for example based on thermoplastic synthetic rubber (eg INDAMELT ®). It is advantageous if the pressure-sensitive adhesive is stable to processing at elevated temperature, for example between 100 and 120 ° C.

Bestimmung der Verbundhaftung:Determination of composite adhesion:

  • entsprechend DIN 53357, Verfahren Baccording to DIN 53357, method B

Unter Verbundhaftung wird der Maximalwert der Kraft verstanden, die notwendig ist, um den zu prüfenden Streifen in 15 mm Breite auf eine Länge von 10 mm unter einem Trennwinkel von 90 ° (mechanisch) spaltend zu trennen. Die Verbundhaftung (hier KF für Klebkraft; SF für Siegelfestigkeit) wird in Newton (N) angegeben, die Streifenbreite wird als Index hinzugefügt (z.B. N/15 mm). Die Abzugsgeschwindigkeit beträgt 100 mm/min.Bonding is understood to mean the maximum value of the force necessary to sever the test strip in 15 mm width to a length of 10 mm at a separation angle of 90 ° (mechanical) splitting. The bond strength (here KF for bond strength, SF for seal strength) is given in Newton (N), the strip width is added as an index (eg N / 15 mm). The take-off speed is 100 mm / min.

II) Schlauchbeutel mit SiegelstreifenII) tubular bag with sealing strips Beispiel II.1) - das Beispiel ist nicht erfindungsgemäß bezüglich des SiegelstreifensExample II.1) - the example is not according to the invention with respect to the sealing strip

Für einen vertikalen Schlauchbeutel (1a), der aus beidseitig siegelbaren biaxial orientierter Polypropylenfolie hergestellt wird, wird auf der Verpackungsmaschine partiell ein Siegelstreifen vor der Formschulter quer zur Folienaufrichtung aufgesiegelt. Dies geschieht rapportgerecht in dem Bereich der späteren Kopfnaht.For a vertical tubular bag (1a), which is produced from biaxially oriented polypropylene film which can be sealed on both sides, a sealing strip is partially sealed on the packaging machine in front of the forming shoulder transversely to the film orientation. This happens rapportgerecht in the area of the later top seam.

Als 15 mm breiter Siegelstreifen dient eine zu Spulen verarbeitete coextrudierte Blasfolie aus:

  1. a) P/E-Copolymer    20 µm
  2. b) Haftschmelzkleber    10 µm
  3. c) P/E-Copolymer    20 µm
The 15 mm wide sealing strip is a coextruded blown film processed into coils:
  1. a) P / E copolymer 20 microns
  2. b) hot-melt adhesive 10 μm
  3. c) P / E copolymer 20 μm

Die Propylen/Ethylen - Copolymere sind mit den üblichen Antiblock und Gleitmittel ausgestattet und entsprechend, denen bei der BOPP-Herstellung. Als Haftkleber wird ein Gemisch aus SBS - Blockpolymeren mit einem aliphatischen Kohlenwasserstoffharz und weiteren Harzen und Ölen sowie Antioxidantien und Stabilisatoren verwendet. Die Viskosität bei 175 °C nach DIN 53018, Brookfield, Sp. 27 ist > 9000 mPa.s.The propylene / ethylene copolymers are equipped with the usual antiblocking agents and lubricants and are similar to those used in BOPP production. The pressure-sensitive adhesive used is a mixture of SBS block polymers with an aliphatic hydrocarbon resin and other resins and oils, as well as antioxidants and stabilizers. The viscosity at 175 ° C according to DIN 53018, Brookfield, Sp. 27 is> 9000 mPa.s.

Die für die Kopfnaht benötigte Länge des Siegelstreifens wird an der Verpackungsmaschine von der Spule abgeschnitten und wie beschrieben aufgesiegelt. Es entsteht ein Schlauchbeutel, bei dem der Siegelstreifen in der Siegelnaht liegt.The length of the sealing strip required for the top seam is cut off from the spool on the packaging machine and sealed as described. The result is a tubular bag, in which the sealing strip is in the sealed seam.

Beispiel II.2) - das Beispiel ist nicht erfindungsgemäß bezüglich des SiegelstreifensExample II.2) - the example is not according to the invention with respect to the sealing strip

Für einen vertikalen Schlauchbeutel (1a), aus beidseitig siegelbarer biaxialer Polypropylenfolie wird auf der Verpackungsmaschine quer zur Folienaufrichtung partiell ein Siegelstreifen vor der Formatschulter aufgesiegelt. Im Gegensatz zu Beispiel I) liegt der Siegelstreifen nicht als Spule sondern als Rolle vor. Die Breite der Rolle entspricht der späteren Länge der Kopfnaht. An der Verpackungsmaschine wird nun die für die Naht benötigten 15 mm abgeschnitten und aufgebracht. Die Folie für den Siegelstreifen besteht aus:

  1. a) Siegelbarem biaxial gerecktem Polypropylen (handelsüblich sind oft beide Seiten einer BOPP-Folie siegelbar. Die zur Haftschmelzkleberschicht zugewandte Seite ist für die Anwendung irrelevant und kann vernachlässigt werden.    20 µm
  2. b) Haftkleber (wie Beispiel I)    10 µm
  3. c) wie a)    20µm
For a vertical tubular bag (1a), of biaxial polypropylene film which can be sealed on both sides, a sealing strip is partially sealed in front of the format shoulder on the packaging machine, transversely to the film orientation. In contrast to Example I) the sealing strip is not present as a coil but as a roll. The width of the roll corresponds to the later length of the top seam. On the packaging machine, the 15 mm required for the seam is cut off and applied. The foil for the sealing strip consists of:
  1. a) Sealable biaxially oriented polypropylene (commercially available are often both sides of a BOPP film sealable.) The side facing the adhesive hot melt layer is irrelevant for the application and can be neglected
  2. b) pressure-sensitive adhesive (as Example I) 10 microns
  3. c) as a) 20μm

Beispiel III.3)Example III.3)

Für einen horizontalen Schlauchbeutel zur Verpackung von Schnittkäse aus einer Verbundfolie aus biaxial orientiertem Polyamid (15 µm) klebstoffkaschiert gegen einer Siegelschicht aus einem Gemisch aus LLDPE und EVA (35 µm) wird auf der Verpackungsmaschine partiell ein Siegelstreifen vor der Formatschulter längs zur Folienaufrichtung aufgesiegelt. Der Siegelstreifen liegt in Spulenform vor und besteht aus:

  1. a) Blasfolie aus LLDPE/EVA, siegelbar    35µm
  2. b) Haftkleber (s. Beispiel I)    10µm
  3. c) längsgestrecktem Polypropylen    38µm
  4. d) Blasfolie aus LLDPE/EVA    35µm
For a horizontal tubular bag for packaging cheese made of a biaxially oriented polyamide (15 microns) adhesive coated against a sealing layer of a mixture of LLDPE and EVA (35 microns) is partially sealed on the packaging machine a sealing strip in front of the format shoulder longitudinally to the film direction. The sealing strip is in coil form and consists of:
  1. a) blown film of LLDPE / EVA, sealable 35μm
  2. b) Pressure-sensitive adhesive (see Example I) 10 μm
  3. c) elongated polypropylene 38μm
  4. d) blown film of LLDPE / EVA 35μm

Die Herstellung erfolgt durch Kaschierung des längsgereckten Polypropylens mit einer Blasfolie mittels Haftkleber.The preparation takes place by laminating the longitudinally stretched polypropylene with a blown film by means of pressure-sensitive adhesive.

Auf der Verpackungsmaschine entsteht ein Schlauchbeutel mit einer Blindnaht, die zum Öffnen vom Verbraucher mit einer Schere bzw. mit einem während des Verpackungsvorganges optional aufgebrachten Aufreißstreifens freigelegt wird. Eine Entnahme einzelner Scheiben und anschließendes Wiederverschließen der Packung ist damit möglich.On the packaging machine, a tubular bag with a blind seam, which is exposed to open by the consumer with a pair of scissors or with a tear-off strip optionally applied during the packaging process. A removal of individual slices and subsequent resealing of the pack is thus possible.

Entnahme einzelner Scheiben und anschließendes Wiederverschließen der Packung ist damit möglich.Removal of individual discs and subsequent resealing of the package is thus possible.

Der Aufbau und die Herstellung möglicher Schlauchbeutelformen wird im Folgenden noch anhand von Figuren erläutert. Es zeigen:

Abb. 1:
Schlauchbeutel, Siegelstreifen in der Kopfnaht;
Abb. 1a:
schematische Ansicht des Schlauchbeutels von hinten,
Abb. 1b:
Ausschnitt: Variante mit doppelter Kopfnaht;
Abb. 2:
Schlauchbeutel, Siegelstreifen in der Rücknaht;
Abb. 2a:
schematische perspektivische Ansicht des Schlauchbeutels mit eingestülpter Seitenfalte,
Abb.2b:
schematische Ansicht: Beutelquerschnitt quer zur Seitenfalte.
The structure and the production of possible tubular bag forms will be explained below with reference to figures. Show it:
Fig. 1:
Tubular bag, sealing strip in the top seam;
Fig. 1a:
schematic view of the tubular bag from behind,
Fig. 1b:
Detail: variant with double top seam;
Fig. 2:
Tubular bag, sealing strip in the backseam;
Fig. 2a:
schematic perspective view of the tubular bag with inverted gusset,
Figure 2b:
schematic view: bag cross-section across the gusset.

Die Abbildung 1 zeigt einen im Ganzen mit 10 bezeichneten Schlauchbeutel mit zwei Quer- oder Kopfnähten 1 und einer Längs- oder Rückennaht 2, die hier als Flossennaht in b/b-Siegelung ausgeführt ist. Bei der Verarbeitung auf einer vertikalen Schlauchbeutelmaschine wird die obere b/b-gesiegelte Quernaht im Allgemeinen als Kopfnaht 1' und die unten liegende Quernaht als Bodennaht 1" bezeichnet. An der Position der Kopfnaht 1' wird ein Siegelstreifen 3 mit eingesiegelt, der von einer seitlich intermittierend zuführenden Abspulvorrichtung eingebracht wird.The illustration 1 shows a generally designated 10 tubular bag with two transverse or head seams 1 and a longitudinal or back seam 2, which is designed here as a fin seal in b / b seal. When processing on a vertical tubular bag machine, the upper b / b-sealed transverse seam is generally referred to as the top seam 1 'and the bottom transverse seam as the bottom seam 1 " laterally intermittently feeding unwinding is introduced.

Im Beispiel nach Abbildung 1a ist der Siegelstreifen 3 so in die Beutelkopfnaht 1' eingesiegelt, dass der Siegelstreifen 3 in seiner Breite über die Siegelnaht hinausragt, jedoch dabei vollständig von Beutelfolie abgedeckt bleibt. Die Siegelnaht 1' ist also hier schmaler als der Siegelstreifen 3. Die Bodennaht 1", die keinen Siegelstreifen 3 enthält, kann demgegenüber breiter ausgeführt sein; Kopf- und Bodennaht können jedoch auch gleich breit gebildet werden.In the example below Figure 1a the sealing strip 3 is sealed in the bag head seam 1 'so that the sealing strip 3 projects beyond the sealing seam in its width, but remains completely covered by the bag film. The seam 1 'is thus narrower here than the sealing strip 3. The bottom seam 1 ", which does not contain a sealing strip 3, can be made wider, but the head and bottom seams can also be made the same width.

Bei dem Ausführungsbeispiel gemäß Abbildung 1b liegt oberhalb der Kopfnaht 1' eine weitere Kopfnaht 1a mit b/b-Siegelung. Diese kann entsprechend der Bodennaht 1" breiter ausgebildet sein als die nun innenliegende Kopfnaht 1' Zwischen der äußeren Kopfnaht 1a und der inneren Kopfnaht 1' sind seitlich Einreißhilfen 4 vorgesehen, da beim Öffnen des Beutels die gesamte äußere Kopfnaht 1a abgerissen werden soll. Die Rückennaht ist deshalb in diesem Beispiel unter Überlappung der Folienbahnkanten als a/b-Naht 2a ausgebildet, um ein leichteres Abreißen oder Abschneiden der äußeren Kopfnaht 1a zu ermöglichen. Die Überstände über die ursprünglich innere Kopfnaht 1' bieten nun eine Anfassmöglichkeit zum Aufreißen der inneren Kopfnaht 1', wobei der eingesiegelte Haftstreifen so reißt, dass die äußeren Siegelschichten des Haftstreifens 3 durch deren Siegelfestigkeit zur Siegelnaht 1' am Folienbeutelmaterial angesiegelt bleiben und der Haftklebstoff in der Mitte des Siegelstreifens 3 freigelegt wird. Es ist nun möglich, den Beutel haftklebend wiederzuverschließen, um beispielsweise restliches Füllgut zu schützen.In the embodiment according to Figure 1b is located above the top seam 1 'another top seam 1a with b / b seal. This can be formed corresponding to the bottom seam 1 "wider than the now inner top seam 1 ' Between the outer top seam 1a and the inner top seam 1 'tear-off aids 4 are provided laterally, since the entire outer top seam 1a should be demolished when opening the bag. The back seam is therefore formed in this example with overlap of the film web edges as a / b-seam 2a, to allow easier tearing or cutting of the outer top seam 1a. The supernatants on the original inner top seam 1 'now offer a grasping possibility for tearing the inner top seam 1', wherein the sealed adhesive strip so ruptures that the outer sealing layers of the adhesive strip 3 remain sealed by the seal strength to the sealing seam 1 'on the film bag material and the pressure-sensitive adhesive in the center of the sealing strip 3 is exposed. It is now possible to re-seal the bag in order to protect, for example, residual contents.

Die Abbildung 2 zeigt einen auf einer horizontalen Schlauchbeutelmaschine gefertigten Schlauchbeutel mit eingezogener Seitenfalte und Siegelstreifen in einer seitlich versetzten Rückennaht.The Figure 2 shows a fabricated on a horizontal bag machine tubular bag with retracted gusset and sealing strips in a laterally offset back seam.

Die Abbildung 2a zeigt dabei eine schematische perspektivische Ansicht des insgesamt wiederum mit 10 bezeichneten Schlauchbeutels. Einseitig an den Siegelnähten 1 (Kopf- und Bodennaht), die b/b-gesiegelt sind, wird eine eingestoßene Seitenfalte 5 gebildet. Diese Seitenfalte wird bei Gebrauch des Beutels als eingezogener Beutelboden (Bodenfalte) genutzt, um dem Beutel Volumen oder gegebenenfalls auch Standfestigkeit zu verleihen. Die Rückennaht 2 ist eine Flossennaht in b/b-Siegelung. Bei der Herstellung des Schlauchbeutels wird der Siegelstreifen 3 in die Rückennaht 2 bei deren Siegelung mit einlaufen gelassen.The Figure 2a shows a schematic perspective view of the total again designated 10 tubular bag. On one side of the sealing seams 1 (head and bottom seam), which are b / b-sealed, an inserted side gusset 5 is formed. This gusset is used in use of the bag as retracted bag bottom (bottom fold) to give the bag volume or possibly stability. The back seam 2 is a fin seam in b / b-seal. During the manufacture of the tubular bag, the sealing strip 3 is allowed to run into the back seam 2 during its sealing.

Wie aus Abbildung 2b besser zu erkennen bilden die Überstände 6 des Folienbahnmaterials an der Flossennaht 2 Anfasshilfen zum Öffnen der Flossennaht 2, wobei der Siegelstreifen 3 in oder an der Haftklebstoffschicht aufreißt, während die angrenzenden Siegelschichten des Siegelstreifens 3 mit dem Folienbahnmaterial verbunden bleiben. Die Flossennaht 2 (Rücknaht) ist wiederum schmaler als der Siegelstreifen 3 ausgebildet.How out Figure 2b to better recognize the protrusions 6 of the film web material on the fin seam 2 Anfasshilfen for opening the fin seam 2, wherein the sealing strip 3 ruptures in or on the pressure-sensitive adhesive layer, while the adjacent sealing layers of the sealing strip 3 remain connected to the film web material. The fin seam 2 (backseam) is in turn narrower than the sealing strip 3.

Claims (16)

  1. A sealing strip (3) for the manufacture of a sealing seam (1; 2) on a foil package, which can be re-closed following tear opening with the aid of an integrated pressure-sensitive adhesive (3a), which is formed in a plurality of layers and which has an inner pressure-sensitive layer (3a) as well as a sealing layer on each of the two outer surfaces, characterized in that the sealing strip (3) has the following sequence of layers: sealing layer / pressure-sensitive layer (3a) / tearproof support layer formed from a bi- or uniaxially orientated foil formed from polypropylene (PP), polyethylene terephthalate (PET) or polyamide (PA) or formed from blends or copolymers with or from said polymers / sealing layer, wherein the pressure-sensitive layer (3a) is in direct all-over contact with one of the outer sealing layers and the support layer and the properties of the pressure-sensitive layer (3a) and the sealing layers are adjusted with respect to each other such that none of the layers apart from the pressure-sensitive layer (3a) is a tearable layer in a manner such that it presents a specified tear region within a layer of the strip and such that the strip (3), which is sealed on both sides when in the position of use, tears within the adhesive layer or at the contact surface of the pressure-sensitive layer with an adjacent layer, wherein the adhesive strength of the pressure-sensitive layer (3a) is less than 10 N/15 mm of strip width and the sealing strength is greater than the adhesive strength.
  2. The sealing strip (3) according to claim 1,
    characterized in that the sealing strength of at least the sealing layer adjacent to the pressure-sensitive adhesive is more than twice as high as the adhesive strength of the pressure-sensitive adhesive.
  3. The sealing strip (3) according to claim 1 or claim 2, characterized in that the pressure-sensitive adhesive layer consists of a pressure-sensitive permanent adhesive and preferably contains a hot-melt adhesive, in particular based on styrene-butadiene block copolymers or styrene/isoprene/butadiene block copolymers, or a warm-melt adhesive or a dispersion adhesive.
  4. The sealing strip (3) according to one of claims 1 to 3, characterized in that the sealing layers consist of olefinic homo- or co-polymers, preferably LDPE, HDPE, LLDPE, m-PE, ethylene/vinyl acetate copolymer, polypropylene homo- or co-polymers, polyester homo- or co-polymers or blends with or from said polymers, and are constructed and/or composed in the same or different manner.
  5. The sealing strip (3) according to one of claims 1 to 4, characterized in that the sealing layer is formed from a multilayer co-extruded foil the two faces of which each contain an outer sealing layer and at least one inner functional layer.
  6. The sealing strip (3) according to one of claims 1 to 5, characterized in that the pressure-sensitive layer is thinner than the adjacent sealing layer and has a thickness of 10 to 20 µm, preferably 10 to 15 µm.
  7. The sealing strip (3) according to one of claims 1 to 6, characterized in that the sealing layer adjacent to the pressure-sensitive layer has a thickness of 20 to 50 µm, preferably 20 to 30 µm.
  8. The sealing strip (3) according to one of claims 1 to 7, characterized in that the strip is produced as a continuous roll of material more than 100 m long, preferably > 1000 m long, with an essentially regular width of 10 to 20 mm.
  9. The sealing strip (3) according to one of claims 1 to 8, characterized in that the strip has a thickness of 50 to 150 µm, wherein the thickness of the pressure-sensitive layer is less than one third of the total thickness and the inner pressure-sensitive layer is at a distance from the surface of the sealing strip which is at least a quarter of the total thickness.
  10. Use of the sealing strip (3) according to one of claims 1 to 9, for the manufacture of a re-closable foil package.
  11. A foil package, in particular a foil pouch, having at least one sealing seam (1, 1', 2) which is provided for opening and re-closing the package and in which a foil strip provided on each of both sides with a sealing layer is sealed into the sealing seam (1, 1', 2) along the sealing direction, said foil strip having a pressure-sensitive adhesive layer between its sealing layers, characterized in that the foil strip is a sealing strip (3) in accordance with one of claims 1 to 9.
  12. A foil package according to claim 11, characterized in that the sealing seam (1, 1', 2) provided for opening and re-closing is a fin seam.
  13. A foil package according to claim 11, characterized in that the sealing seam (2) provided for opening and re-closing is an overlap seam having an overhang.
  14. A foil package according to claim 11, characterized in that the seam (1') provided for opening and re-closing is a blind seam.
  15. A method for manufacturing a foil pouch which can be re-closed following opening by means of a sealing seam (1, 1', 2) provided therefore, wherein the foil pouch is produced in a manner which is known per se, characterized in that when sealing in at least one sealing seam (1, 1', 2) provided for opening and re-closing the package, a sealing strip according to one of claims 1 to 9 is inserted.
  16. A method according to claim 15, characterized in that the foil pouch is formed in a continuous method from at least one foil strip running off a roll and the sealing strip (3) is supplied continuously from a separate roll or spool at the velocity of the foil strip or runs off the roll or spool.
EP06005923A 2005-04-20 2006-03-23 Sealing strip, associated foil packaging and methods for their manufacture Not-in-force EP1714894B1 (en)

Priority Applications (1)

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PL06005923T PL1714894T3 (en) 2005-04-20 2006-03-23 Sealing strip, associated foil packaging and methods for their manufacture

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Application Number Priority Date Filing Date Title
DE102005018458A DE102005018458A1 (en) 2005-04-20 2005-04-20 Sealing strips, associated foil packaging and their manufacture

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EP1714894B1 true EP1714894B1 (en) 2009-08-19

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US7681732B2 (en) 2008-01-11 2010-03-23 Cryovac, Inc. Laminated lidstock
US8622618B2 (en) 2009-08-14 2014-01-07 Cryovac, Inc. Easy open and reclosable package with discrete laminate having panel section with easy-open sealant
US8646975B2 (en) 2009-08-14 2014-02-11 Cryovac, Inc. Easy open and reclosable package with discrete tape and die-cut web
US8979370B2 (en) 2011-01-28 2015-03-17 Cryovac, Inc. Easy open and reclosable package with discrete laminate with die-cut
US9221591B2 (en) 2009-08-14 2015-12-29 Cryovac, Inc. Easy open and reclosable package with discrete laminate with die-cut

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020106662A1 (en) * 2019-12-06 2021-06-10 Technische Universität Dresden Method for producing a multi-layer seam and packaging material comprising a multi-layer seam and device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882789A (en) * 1995-06-07 1999-03-16 Pechiney Recherche Packaging material for forming an easy-opening reclosable packaging material and package
AU3834200A (en) * 1999-03-31 2000-10-16 Safta S.P.A. Reclosable packaging systems
US20050031233A1 (en) * 2003-08-06 2005-02-10 Varanese Donald Vincent Cohesive reclosure systems and containers using same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7681732B2 (en) 2008-01-11 2010-03-23 Cryovac, Inc. Laminated lidstock
US8622618B2 (en) 2009-08-14 2014-01-07 Cryovac, Inc. Easy open and reclosable package with discrete laminate having panel section with easy-open sealant
US8646975B2 (en) 2009-08-14 2014-02-11 Cryovac, Inc. Easy open and reclosable package with discrete tape and die-cut web
US9221591B2 (en) 2009-08-14 2015-12-29 Cryovac, Inc. Easy open and reclosable package with discrete laminate with die-cut
US8979370B2 (en) 2011-01-28 2015-03-17 Cryovac, Inc. Easy open and reclosable package with discrete laminate with die-cut

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DE102005018458A1 (en) 2006-10-26
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PL1714894T3 (en) 2010-02-26
DE502006004565D1 (en) 2009-10-01

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