EP0957045B1 - Packaging with packaging sheet with integral opening- and reclosing system - Google Patents

Description

The invention relates to a packaging container according to the preamble of claim 1.

Known pouch packaging have an opening mechanism in the Shape of a tear notch. Bags are reclosed, for example using a sealed zipper or one of the packaging attached adhesive label. The systems mentioned for easy opening and reclosing work separately and are usually attached to the bag filling machine. In the case of Zipper sealing systems for expensive additional investments that each individual operator a bag filling machine if necessary.

EP-A-0 541 093 discloses a bag packaging in which two packaging films are used over a circumferential sealing seam to form a closed Packaging are interconnected. On one of the edges of the bag the adhesive force between the foils sealed against each other is set so that they pull apart from each other by forming an opening separate. A zipper is sealed under this edge of the bag, which The bag can be reclosed.

EP-A-0 661 154 discloses a container shell with a circumferential sealing edge, on which a two-layer cover film is sealed. This two-ply Lid film consists of a container-near first film, in which an openable Area is limited by a line of weakness. The one above second film is sealed against the first film with a peripheral edge, the adhesive force in this edge area between the first and the second Foil is adjusted so that the second film peel off the first film leaves. The remaining surface of the second film opposite the first film The film is coated with a pressure sensitive adhesive within the surrounding edge of the seal. After opening the container for the first time by pulling the second film from the first film remains the one delimited by the line of weakness Opening part of the first film over the pressure sensitive adhesive on the second film stick so that the opening is released. By covering the first The container can be foil on the second foil by means of the between the two Foils arranged pressure sensitive adhesive are closed again. The one for the outer packaging The packaging film used comprises an integrated system for easy opening and reclosing two outside the range of the Opening and reclosing system with each other using a permanent adhesive connected foils. Here, an inner film has a first perforation as an opening and an outer film, a second perforation to form a die first sealing flap covering the perforation. In the edge area of the Sealing flap, a pressure sensitive adhesive is arranged between the two foils.

From US-A-5 350 062 a packaging film is known which according to Wrapping an object to be packed into a package with leads to a reclosable opening.

The invention is therefore based on the object of a packaging container with a packaging film to create, in which the opening and resealing mechanism already during the production or finishing of the packaging film can be built into this.

A packaging container with the features of claim 1 leads to the achievement of the object according to the invention. Preferred embodiments of the packaging container according to the invention are the subject of dependent claims.

The packaging film with integrated opening and resealing system offers the advantage over known systems that no further measures during the later production and filling of the bags required to provide an opening and reclosing system are. In addition to the aforementioned loss of additional investments For example, productivity can be increased on bag packaging machines.

A first opening guarantee can be achieved if the outer film only partially severed along the first perforation and / or the first Perforation is not continuous over the entire thickness of the outer film.

The sealing flap can be an adhesive-free zone as a gripping and tearing aid exhibit.

In a preferred embodiment of the packaging photo the inner film consists of a sealable plastic, in particular from an optionally modified polyolefin such as polyethylene or polypropylene, their copolymers or ionomer.

The outer film can be a monofilm or a composite film, in particular a laminate with an outer partial film made of oriented polyethylene terephthalate (PET) or oriented polypropylene (oPP) and an inner partial film made of oriented polyamide or aluminum.

An adhesive based on polyurethane is preferred as the permanent adhesive used. A suitable pressure sensitive adhesive (PSA) is based on polyacrylate or other self-adhesive resins.

In the case of pouch packaging, the packaging film is sealed against another film or after folding against yourself into a bag is shaped. The packaging film can also be used as a lid on the edge sealed or glued to a rigid or semi-rigid container his.

• die als Folienband vorliegende äussere Folie mit dem Permanentkleber und dem Haftkleber beschichtet wird,
• in die mit den Klebern beschichtete äussere Folie die zweiten Perforationen zur Bildung der Verschliesslaschen geschnitten werden,
• in die als Folienband vorliegende innere Folie die ersten Perforationen als Öffnungen geschnitten werden, und
• die beiden Folien zur Verpackungsfolie in Form eines Folienbandes zusammengeführt und miteinander verklebt werden.

A preferred method for the continuous production of the composite film is characterized in that

• the outer film, which is present as a film strip, is coated with the permanent adhesive and the pressure sensitive adhesive,
• the second perforations to form the sealing tabs are cut into the outer film coated with the adhesives,
• the first perforations are cut as openings into the inner film present as a film strip, and
• the two films are brought together to form a packaging film in the form of a film strip and glued together.

• eine erste Klebstoffauftragstation zum partiellen Auftragen des Permanentklebers auf die als Folienband vorliegende äussere Folie,
• eine zweite Klebstoffauftragstation zum partiellen Auftragen des Haftklebers auf die äussere Folie,
• eine erste Schneidstation zum Schneiden der zweiten Perforationen in die äussere Folie,
• eine zweite Schneidstation zum Schneiden der ersten Perforationen in die als Folienband vorliegende innere Folie,
• eine Kaschierstation zum Zusammenführen und Verkleben der beiden Folien zur Verpackungsfolie in Bandform, und
• eine Steuereinheit zum Steuern der Schneidoperationen und der Bandlaufgeschwindigkeiten der beiden Folien zur gegenseitigen Ausrichtung vor deren Eintritt in die Kaschierstation.

A suitable system for the continuous production of the composite film is characterized by

• a first adhesive application station for the partial application of the permanent adhesive to the outer film present as a film strip,
• a second adhesive application station for partial application of the pressure sensitive adhesive to the outer film,
• a first cutting station for cutting the second perforations into the outer film,
• a second cutting station for cutting the first perforations into the inner film present as a film strip,
• a laminating station for merging and gluing the two films to form a packaging film in tape form, and
• a control unit for controlling the cutting operations and the tape running speeds of the two films for mutual alignment before they enter the laminating station.

• Fig.1 eine Schrägsicht auf eine Beutelverpackung;
• Fig. 2 die Draufsicht auf einen Teil einer inneren Folie einer Verpackungsfolie im Bereich des Öffnungs- und Wiederverschliess-systems;
• Fig. 3 die Draufsicht auf einen Teil einer äusseren Folie einer Verpackungsfolie im Bereich des Öffnungs- und Wiederverschliess-systems;
• Fig. 4 die Draufsicht auf einen Teil einer Beutelverpackung mit einer aus der inneren und äusseren Folie der Figuren 2 und 3 zusammengesetzten Verpackungsfolie;
• Fig. 5 einen Querschnitt durch die Beutelverpackung von Figur 4 entlang deren Linie I - I;
• Fig. 6 einen Längsschnitt zu Herstellung einer Verpackungsfolie mit integriertem Öffnungs- und Wiederverschliesssystem;
• Fig. 7 die Draufsicht auf die Anlage von Fig. 6;
• Fig. 8 eine Schrägsicht auf eine andere Beutelverpackung;
• Fig. 9 einen Querschnitt durch die Beutelverpackung von Fig. 8 entlang deren Linie II-II in verschlossenem Zustand.

Further advantages, features and details of the invention emerge from the following description of preferred exemplary embodiments and with reference to the drawing; this shows schematically in

• 1 shows an oblique view of a bag packaging;
• 2 shows the top view of part of an inner film of a packaging film in the region of the opening and reclosing system;
• 3 shows the top view of a part of an outer film of a packaging film in the region of the opening and reclosing system;
• 4 shows the top view of part of a bag packaging with a packaging film composed of the inner and outer film of FIGS. 2 and 3;
• 5 shows a cross section through the bag packaging of FIG. 4 along the line I - I thereof;
• 6 shows a longitudinal section for producing a packaging film with an integrated opening and reclosing system;
• Fig. 7 is a top view of the plant of Fig. 6;
• 8 shows an oblique view of another bag packaging;
• Fig. 9 shows a cross section through the bag packaging of Fig. 8 along the line II-II in the closed state.

A bag packaging 10 shown in FIG. 1 has a front wall film 12-im called the following packaging film - and a backing film 14 on the are connected to one another via a circumferential sealing seam 16. In the as The packaging film 12 used in the front wall is an opening and reclosing system 18 with a locking tab 20 for reclosing an opening 22 arranged. The reclosability of the opening 22 is by means of a pressure sensitive adhesive applied to the back of the sealing flap 20 24 reached. As a gripping and tearing aid, there is 20 on the locking tab an adhesive-free zone 26 is provided.

As shown in FIGS. 2 to 5, the packaging film 12 is made of an inner film 28 from, for example, polyethylene, polypropylene, their copolymers or ionomer and an outer film 30 composed. The outer film 30 is in the present case a composite with an outer partial film 30a, for example oriented polyethylene terephthalate (PET) or oriented polypropylene (oPP) and an inner partial film 30b of, for example, oriented Polyamide or aluminum.

The inner film 28 has a first perforation 32 to form the later one Provide opening 22. There is a second perforation 34 in the outer film 30 arranged to form the closure tab 20. This second perforation 34 is partly to provide a first opening guarantee with bridges or Provide webs 36, d. H. with places where the foil is not is completely severed. Such bridges or webs 36 can of course also be provided on the first perforation 32. As an alternative to The bridges or webs 36 can be perforated in this way that the film is not continuously separated over its thickness.

5, between the inner film 28 and the outer film 30, a permanent adhesive 38 based on, for example Arranged polyurethane. This permanent adhesive 38 extends with one exception the area of the opening and reclosing system 18 to the entire film surface. Between the part forming the closing tab 20 the outer film 30 and the inner film 28 is located on the back the sealing tab 20 attached pressure sensitive adhesive 24, for example in the Form of an acrylic adhesive or other self-adhesive resin. As in 5 further shown, the packaging film 12 is the one shown in FIG. 1 Bag packaging 10 to form the circumferential sealing seam 16 against the Back wall film 14 sealed. The back wall film 14 shows in the present example a structure identical to the packaging film 12, namely one inner film 40 made of, for example, polyethylene, polypropylene, their copolymers or ionomer over the permanent adhesive 38 made of, for example, polyurethane is glued to the outer film 42. The outer film 42 also exists here from an outer partial film 42a made of, for example, oriented polyethylene terephthalate (PET) or oriented polypropylene (oPP) and an inner Partial film 42b made of, for example, oriented polyamide or aluminum. The Backing film 14 can also have a different layer structure.

The opening and closing mechanism of the opening and reclosing system 18 is briefly explained below with reference to FIG. 5.

By pulling the sealing tab 20 in the area of the adhesive-free zone 26 becomes the connection between the outer film 30 and the inner film 28 separated in the area of the sealing flap 20, the pressure-sensitive adhesive 24 in the present case Case on the locking tab 20 remains. When fully withdrawn Sealing flap 20 becomes the first perforation serving the opening 22 32 exposed, i.e. the bag is open. When traveling and light Pressing the sealing tab 20 adheres by means of the adhesive 24 again on the inner film 28, so that the bag is closed again.

The foils shown in FIGS. 2 to 4 are in the form of foil strips continuous production of the composite film 12 before.

A system shown in FIGS. 6 and 7 for the continuous production of a Packaging film 12 with integrated opening and reclosing system 18 has a first adhesive application station 44 with an adhesive application roller 46 for the partial application of the permanent adhesive 38 on the tape in the form outer film 30 on. The first adhesive application station 44 in the tape running direction a second adhesive application station 48 with a Adhesive application roller 50 for partial application of the pressure sensitive adhesive 24. After the Coating the outer film 30 with the two adhesives 38, 24 is the coated outer film 30 passed through a drying oven 52. In a subsequent first cutting station 54, the second perforations 34 in cut the outer film 30.

The film 28, which is also present as a film strip, passes through a second Cutting station 56, in which the first perforations are used to form the openings 22 32 can be cut. The cutting of the perforations 32, 34 in the Cutting stations 54, 56 can be made by means of mechanical knives or without contact for example using a laser cutting device.

The films 28, 30 pre-assembled in this way are processed in a laminating station 60 to form the packaging film 12 with an integrated opening and reclosing system 18 merged and glued together. The one from the Laminating station 60 emerging packaging film 12 subsequently becomes a Roll 62 wound.

Since the two foils 28, 30 are brought together in a precise manner in the laminating station 60 the cutting operations in the cutting stations 54, 56 as well as the tape running speeds of the two foils 28, 30 accordingly controlled. This control can, for example, in a known manner via printed marks attached to the edge of the film strips.

The packaging film produced according to the method described above 12 can be used in a known manner for the production of packaging bags to be processed further.

The packaging film 12 with an integrated opening and reclosing system 18, depending on the later use, in different Molds are produced, for example as a film strip with two or more parallel bag units, which after the laminating station 60 into individual Units are separated.

8 and 9 show a variant of a bag packaging 10, which with respect the film structure and the opening and reclosing system shown in Fig. 1 to 5 shown bag packaging corresponds. For the same or comparable Parts are therefore used the same reference numerals.

As can be seen in particular from FIG. 9, during the bag manufacturing process folded the packaging laminate and then against yourself be sealed. Packaging film 12 and back wall film 14 are in this Case over the folded end of the bag package 10 in one piece. To this It is possible in this way to provide the opening 22 which is intended to form the opening to put first perforation 32 in the folding area, which makes it easy to remove the Filled goods made possible by the head or foot end of the bag packaging 10. In the example shown in Fig. 8, the contingent relationships between the Pressure sensitive adhesive 24 and the inner and outer foils 28, 30 such that - in Contrary to the bag packaging shown in Fig. 1 - by pulling on the sealing flap 20 of the pressure-sensitive adhesive 24 adhere to the inner film 28 remains.

Claims (6)

1. Packaging container comprising a packaging film (12) shaped to form a bag (10) by circumferential sealing to another film (14) or by sealing to itself after folding, or sealed on to the rim of a rigid or semi-rigid container or glued thereto in order to serve as a lid, the packaging film (12) including two films (28, 30) joined together to form an integrated system (18) for simple opening and reclosing and the inner film (28) having a first perforation (32) serving as an opening (22), characterised in that the two films are joined together outside the region of the opening and reclosing system (18) by means of a permanent adhesive (38), the outer film (30) having a second perforation (34) for forming a closing flap (20) covering the first perforation (32) and a pressure-sensitive adhesive (24) being arranged between the two films (28, 30) in the region of the closing flap (20).
2. Packaging container according to claim 1, characterised in that the outer film (30) is only partially severed along the second perforation (34) and/or the second perforation (34) does not go through the entire thickness of the outer film (30).
3. Packaging container according to claim 1 or claim 2, characterised in that the closing flap (20) has an adhesive-free zone (26) serving as a gripping and tearing aid.
4. Packaging container according to one of claims 1 to 3, characterised in that the inner film (28) consists of a heat-sealable plastic, in particular a possibly modified polyolefin, such as polyethylene or polypropylene, or copolymers or ionomers thereof.
5. Packaging container according to one of claims 1 to 4, characterised in that the outer film (30) consists of a composite film, in particular a laminate with an outer partial film (30a) of oriented polyethylene terephthalate (PET) or oriented polypropylene (oPP) and an inner partial film (30b) of oriented polyamide or aluminium.
6. Packaging container according to one of claims 1 to 5, characterised in that the permanent adhesive (38) is on the basis of polyurethane and the pressure-sensitive adhesive is an acrylic adhesive or another pressure-sensitive resin.

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