EP1842784B1 - Film bag and method for manufacturing the same - Google Patents

Film bag and method for manufacturing the same Download PDF

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Publication number
EP1842784B1
EP1842784B1 EP06007113A EP06007113A EP1842784B1 EP 1842784 B1 EP1842784 B1 EP 1842784B1 EP 06007113 A EP06007113 A EP 06007113A EP 06007113 A EP06007113 A EP 06007113A EP 1842784 B1 EP1842784 B1 EP 1842784B1
Authority
EP
European Patent Office
Prior art keywords
plastic film
bag
sheet
side folds
film bag
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
Application number
EP06007113A
Other languages
German (de)
French (fr)
Other versions
EP1842784A1 (en
Inventor
Alfons Kruse
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.)
Nordenia Deutschland Halle GmbH
Original Assignee
Nordenia Deutschland Halle GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nordenia Deutschland Halle GmbH filed Critical Nordenia Deutschland Halle GmbH
Priority to DE502006004371T priority Critical patent/DE502006004371D1/en
Priority to EP06007113A priority patent/EP1842784B1/en
Priority to AT06007113T priority patent/ATE437810T1/en
Priority to PCT/EP2007/002730 priority patent/WO2007112898A1/en
Publication of EP1842784A1 publication Critical patent/EP1842784A1/en
Application granted granted Critical
Publication of EP1842784B1 publication Critical patent/EP1842784B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides

Definitions

  • the invention relates to a film bag which is formed by folding and sealing a film, with two front sides, two V-shaped side folds, a bottom fold and a head-side bag opening.
  • Such film bags are for example from the patents DE 1 238 650 and DE 196 12 102 C2 known.
  • the film bag has an exact cuboid shape with a flat as possible floor. If the bag deviates too much from this ideal shape, there is often a problem with the further packaging process. For example, the filled bags overturn when they are not guided. This can lead to a standstill of an automatic filling process and thus cause a reduction of the output.
  • the object of the invention is therefore to provide a foil bag according to the prior art, in which a good stability is guaranteed.
  • the object is achieved according to the invention in that in the area of the blind seam additionally a separately generated circumferential mechanical weakening is provided.
  • the inventive combination of blind seal seam and separate mechanical weakening ensures a very slight buckling of the blind seal seam to form the bottom surface. Due to the easily bendable edges of the film bag according to the invention is safe on its bottom surface and has no tendency to tip over.
  • the mechanical weakening is produced by means of a slight punching, a light cut, an embossing or a laser process.
  • the film may also have end-side punched, which come to rest through the behavior of the film in the region of the bottom surface and thereby reduce the number of bottom surfaces forming film layers partially.
  • the smaller number of film layers advantageously ensures smaller thickness jumps in the bottom area, whereby a flat bottom surface is ensured.
  • the invention further provides a process for producing a film bag according to claim 4.
  • Advantageous embodiments of this process are described in claims 5 to 8.
  • the Fig. 1 to 5 show a method for producing a film bag made of plastic, which has two front sides 1, two V-shaped side gussets 2, a bottom surface 3 and a head-side bag opening 4.
  • an endless film web 5 is first provided with a transversely extending to the web 5, over the entire width of the web 5 extending blind seam 6.
  • the film web 5 is additionally provided with a separately generated, likewise over the entire web width extending mechanical weakening 7 ( Fig. 1 ).
  • the endless film tube 5 is provided with punched-12, will be discussed in more detail later.
  • edge punching 12 first a narrow strip 16.
  • the V-shaped side folds are folded, the film web with a longitudinal sealing seam 13 to a film tube 5 'welded and the narrow strip 16 separated.
  • the longitudinal sealing seam 13 is located at a corner between a front side 1 and a side fold 2.
  • the gussets 2 are provided ( Fig. 2 ).
  • a blank 5 "for a single foil bag is produced by a separation process from the endless film tube 5.
  • the blank 5" is produced by a punching process along the parting lines 14.
  • the blank 5 " has a zipper to close the opening 4 15, which has already been welded onto the endless film web 5 (s. Fig. 1 ).
  • a slider can also be welded on.
  • the sealing seams 9, 10 are spaced from one another for closing the front sides 1 and run parallel to one another.
  • the bottom surface 3 of the film bag is formed by folding over the circumferential blind seam 6 ( Fig. 4 ).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)

Abstract

The standing properties of the film bag standing on the base (3) are improved by a continuous blind heat-sealed seam (6). Seam must be folded over when the base is unfolded. A continuous mechanical weakening (7) is a separately produced adjacent to the seam. The weakening was produced by light punching (12), small cut-outs, stamping or laser treatment. The film (5) has punchings at the ends, which lie down once the film close to the base is folded. An independent claim is included for a method of producing a film bag.

Description

Die Erfindung betrifft einen Folienbeutel, der durch Falten und Siegeln einer Folie geformt ist, mit zwei Frontseiten, zwei V-förmigen Seitenfalten, einer Bodenfalte sowie einer kopfseitigen Beutelöffnung.The invention relates to a film bag which is formed by folding and sealing a film, with two front sides, two V-shaped side folds, a bottom fold and a head-side bag opening.

Derartige Folienbeutel sind beispielsweise aus den Patentschriften DE 1 238 650 und DE 196 12 102 C2 bekannt. Bei der herkömmlichen Faltung von Seitenfaltenbeuteln besteht häufig das Problem, dass die Beutel beim Befüllen sich nicht vollständig auffalten. Dies ist insbesondere dann der Fall, wenn stärkere Verbundfolien eingesetzt werden. Idealerweise besitzt der Folienbeutel eine exakte Quaderform mit einem möglichst ebenen Boden. Sofern der Beutel von dieser Idealform zu stark abweicht, kommt es häufig zu Problem beim weiteren Verpackungsprozess. So kippen beispielsweise die befüllten Beutel um, wenn sie nicht geführt werden. Dies kann zum Stillstand eines automatischen Befüllungsprozesses führen und somit eine Verringerung des Ausstoßes verursachen.Such film bags are for example from the patents DE 1 238 650 and DE 196 12 102 C2 known. In the conventional folding of side gusseted bags, there is often the problem that the bags do not unfold completely during filling. This is especially the case when stronger composite films are used. Ideally, the film bag has an exact cuboid shape with a flat as possible floor. If the bag deviates too much from this ideal shape, there is often a problem with the further packaging process. For example, the filled bags overturn when they are not guided. This can lead to a standstill of an automatic filling process and thus cause a reduction of the output.

Aus der Druckschrift EP1 323 639 A1 ist ein Folienbeutel mit den eingangs beschriebenen Merkmalen bekannt, wobei die Standfestigkeit des auf der Bodenfläche aufstehenden Folienbeutels durch eine umlaufende, beim Ausfalten der Bodenfläche umzuknickende Blindsiegelnaht erhöht ist. Der Begriff Blindsiegelnaht meint, dass bei diesem Vorgang keine Folienlagen miteinander verbunden werden, sondern lediglich eine lokale Schwäche des Folienmaterials aufgrund der Hitzeeinwirkung beim Blindsiegelvorgang erfolgt. Ein alleiniger Blindsiegelvorgang führt nicht zu der gewünschen Standfähigkeit des Folienbeutels.From the publication EP1 323 639 A1 a film bag with the features described above is known, wherein the stability of the upstanding on the bottom surface film bag is increased by a circumferential, umzuknickende when unfolding the bottom surface blind seal. The term blind seal means that in this process, no film layers are connected to each other, but only a local weakness of the film material due to the effect of heat during blind sealing process takes place. A sole blind sealing process does not lead to the desired stability of the foil bag.

Aufgabe der Erfindung ist es daher, einen Folienbeutel gemäß dem Stand der Technik bereit zu stellen, bei welchem eine gute Standfähigkeit gewährleistet ist.The object of the invention is therefore to provide a foil bag according to the prior art, in which a good stability is guaranteed.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass im Bereich der Blindsiegelnaht zusätzlich eine separat erzeugte, umlaufende mechanische Schwächung vorgesehen ist.The object is achieved according to the invention in that in the area of the blind seam additionally a separately generated circumferential mechanical weakening is provided.

Die erfindungsgemäße Kombination von Blindsiegelnaht und separater mechanischer Schwächung gewährleistet ein sehr leichtes Umknicken der Blindsiegelnaht zur Bildung der Bodenfläche. Aufgrund der leicht knickbaren Kanten steht der erfindungsgemäße Folienbeutel sicher auf seiner Bodenfläche auf und besitzt keine Neigung umzukippen.The inventive combination of blind seal seam and separate mechanical weakening ensures a very slight buckling of the blind seal seam to form the bottom surface. Due to the easily bendable edges of the film bag according to the invention is safe on its bottom surface and has no tendency to tip over.

Vorzugsweise wird die mechanische Schwächung mittels eines leichten Ausstanzens, eines leichten Ausschneidens, eines Prägens oder eines Laservorganges erzeugt. Die Folie kann ferner endseitige Aussstanzungen aufweisen, die durch das Verhalten der Folie im Bereich der Bodenfläche zu liegen kommen und hierdurch die Anzahl der Bodenflächen bildenden Folienlagen bereichsweise reduzieren. Die geringere Anzahl von Folienlagen gewährleistet in vorteilhafter Weise geringere Dickensprünge im Bodenbereich, wodurch eine ebene Bodenfläche gewährleistet wird.Preferably, the mechanical weakening is produced by means of a slight punching, a light cut, an embossing or a laser process. The film may also have end-side punched, which come to rest through the behavior of the film in the region of the bottom surface and thereby reduce the number of bottom surfaces forming film layers partially. The smaller number of film layers advantageously ensures smaller thickness jumps in the bottom area, whereby a flat bottom surface is ensured.

Gegenstand der Erfindung ist ferner ein Verfahren zur Herstellung eines Folienbeutels gemäß Anspruch 4. Vorteilhafte Ausgestaltungen dieses Verfahrens sind in den Ansprüchen 5 bis 8 beschrieben.The invention further provides a process for producing a film bag according to claim 4. Advantageous embodiments of this process are described in claims 5 to 8.

Im Folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung ausführlicher erläutert. Es zeigen schematisch

Fig. 1
einen erfindungsgemäßen Folienbeutel vor dem Falten seiner Seitenfalten,
Fig. 2
den in Fig. 1 dargestellten Folienbeutel nach Falten der Seitenfalten,
Fig. 3
den in Fig. 2 dargestellten Folienbeutel nach einem Versiegeln des Bodenbereiches,
Fig. 4
eine Bodenansicht des Folienbeutels mit umgefalteter Bodenfläche und
Fig. 5
eine perspektivische Darstellung des Folienbeutels.
In the following the invention will be explained in more detail with reference to a drawing showing only one embodiment. It show schematically
Fig. 1
a foil pouch according to the invention before folding its side folds,
Fig. 2
the in Fig. 1 illustrated foil pouches after folding the side folds,
Fig. 3
the in Fig. 2 illustrated foil bags after sealing the bottom area,
Fig. 4
a bottom view of the foil bag with folded bottom surface and
Fig. 5
a perspective view of the film bag.

Die Fig. 1 bis 5 zeigen ein Verfahren zur Herstellung eines Folienbeutels aus Kunststoff, der zwei Frontseiten 1, zwei V-förmige Seitenfalten 2, eine Bodenfläche 3 und eine kopfseitige Beutelöffnung 4 aufweist. Hierbei wird zunächst eine endlose Folienbahn 5 mit einer quer zur Bahn 5 verlaufenden, sich über die gesamte Breite der Bahn 5 erstreckende Blindsiegelnaht 6 versehen. Im Bereich der Blindsiegelnaht 6 wird die Folienbahn 5 zusätzlich mit einer separat erzeugten, ebenfalls sich über die gesamte Bahnbreite erstreckenden mechanischen Schwächung 7 versehen (Fig. 1). Ferner wird der endlose Folienschlauch 5 mit Ausstanzungen 12 versehen, auf die später noch näher eingegangen wird. Um auch nach dem Stanzen eine problemlose Führung der Folienbahn 5 zu gewährleisten verbleibt neben der rechten, randseitigen Ausstanzung 12 zunächst ein schmaler Streifen 16. Anschließend werden die V-förmigen Seitenfalten gefaltet, die Folienbahn mit einer Längssiegelnaht 13 zu einem Folienschlauch 5' verschweißt und der schmale Streifen 16 abgetrennt. Die Längssiegelnaht 13 befindet sich an einer Ecke zwischen einer Frontseite 1 und einer Seitenfalte 2. An den anderen entsprechenden Kanten des Folienbeutels sind Blindsiegelnähte 13' vorgesehen (Fig. 2). Anschließend werden die Seitenfalten 2, ebenso wie die Frontseiten 1 des endlosen Folienschlauches 5', mit Siegelnähten 8, 9, 10 bodenseitig verschlossen (Fig. 3). Anschließend wird durch einen Trennvorgang aus dem endlosen Folienschlauch 5' ein Zuschnitt 5" für einen einzelnen Folienbeutel erzeugt. Im Ausführungsbeispiel erfolgt die Herstellung des Zuschnittes 5" durch einen Stanzvorgang entlang der Trennlinien 14. Der Zuschnitt 5" besitzt zum Verschluss der Öffnung 4 einen Zipper 15, welcher bereits auf die endlose Folienbahn 5 aufgeschweißt wurde (s. Fig. 1). Alternativ zu einem Zipper kann auch ein Slider aufgeschweißt werden. Anhand der Fig. 3 ist ersichtlich, dass die Siegelnähte 9, 10 zum Verschließen der Frontseiten 1 voneinander beabstandet sind und parallel zueinander verlaufen. An einem einzelnen Zuschnitt 5" wird durch Umknicken der umlaufenden Blindsiegelnaht 6 die Bodenfläche 3 des Folienbeutels gebildet (Fig. 4). Einer vergleichenden Betrachtung der Fig. 4 und 5 ist zu entnehmen, dass der durch die Siegelnähte 9, 10 verschlossene Endabschnitt des Folienschlauches 5 gegen die Bodenfläche 3 gefaltet und mit dieser verklebt wird. Die entsprechende Knicklinie X ist in den Fig. 3 bis 5 gestrichelt dargestellt. Sie verläuft parallel zu den Siegelnähten 9, 10. Um die Anzahl der Folienlagen im Bodenbereich möglichst gering zu halten, wird der Endabschnitt 11 mit Ausstanzungen 12 versehen, welche vorzugsweise aus der Folienbahn 5 mit noch nicht eingelegten Seitenfalten 2 (Fig. 1) in Form von Fenstern ausgestanzt werden. Die Siegelnähte 8 zum bodenseitigen Verschließen der Seitenfalten 2 verlaufen schräg zum Folienschlauch 5'.The Fig. 1 to 5 show a method for producing a film bag made of plastic, which has two front sides 1, two V-shaped side gussets 2, a bottom surface 3 and a head-side bag opening 4. Here, an endless film web 5 is first provided with a transversely extending to the web 5, over the entire width of the web 5 extending blind seam 6. In the area of the blind seal seam 6, the film web 5 is additionally provided with a separately generated, likewise over the entire web width extending mechanical weakening 7 ( Fig. 1 ). Furthermore, the endless film tube 5 is provided with punched-12, will be discussed in more detail later. In order to ensure trouble-free guidance of the film web 5 even after punching remains next to the right, edge punching 12 first a narrow strip 16. Subsequently, the V-shaped side folds are folded, the film web with a longitudinal sealing seam 13 to a film tube 5 'welded and the narrow strip 16 separated. The longitudinal sealing seam 13 is located at a corner between a front side 1 and a side fold 2. At the other corresponding edges of the film bag blind sealing seams 13 'are provided ( Fig. 2 ). Subsequently, the gussets 2, as well as the front sides 1 of the endless film tube 5 ', sealed with sealing seams 8, 9, 10 on the bottom side ( Fig. 3 ). Subsequently, a blank 5 "for a single foil bag is produced by a separation process from the endless film tube 5. In the exemplary embodiment, the blank 5" is produced by a punching process along the parting lines 14. The blank 5 "has a zipper to close the opening 4 15, which has already been welded onto the endless film web 5 (s. Fig. 1 ). As an alternative to a zipper, a slider can also be welded on. Based on Fig. 3 it can be seen that the sealing seams 9, 10 are spaced from one another for closing the front sides 1 and run parallel to one another. On a single blank 5 ", the bottom surface 3 of the film bag is formed by folding over the circumferential blind seam 6 ( Fig. 4 ). A comparative consideration of Fig. 4 and 5 It can be seen that the sealed by the sealing seams 9, 10 end portion of the film tube 5 is folded against the bottom surface 3 and bonded thereto. The corresponding bend line X is in the Fig. 3 to 5 shown in dashed lines. It runs parallel to the sealing seams 9, 10. In order to keep the number of film layers in the bottom area as small as possible, the end section 11 is provided with punched-12, which preferably from the film web 5 with not yet inserted gussets 2 Fig. 1 ) are punched out in the form of windows. The sealing seams 8 for closing the side folds 2 at the bottom run obliquely to the film tube 5 '.

Claims (9)

  1. Plastic film bag, which is formed by folding and sealing a plastic film (5), comprising two front sides (1), two V-shaped side folds (2), a bottom surface (3) as well as a bag opening (4) at the top, wherein the stability of the plastic film bag standing on the bottom surface (3) is increased by a perimetric dummy sealing seam (6) which is to be folded over when folding out the bottom surface (3), characterised in that a separately created perimetric mechanical weakening (7) is additionally provided in the region of the dummy sealing seam (6).
  2. Plastic film bag according to Claim 1, characterised in that the mechanical weakening (7) was created by means of light stamping, light cutting, embossing or a laser procedure.
  3. Plastic film bag according to Claim 1 or 2, characterised in that the plastic film (5) has punched out sections (12) at the end, which punched out sections come to lie in the region of the bottom surface (3) by means of the folding of the plastic film (5) and, as a result, reduce the number of plastic film layers which form the bottom surface (3) in certain areas.
  4. Method for producing a plastic film bag comprising two front sides (1), two V-shaped side folds (2), a bottom surface (3) and a bag opening (4) at the top,
    wherein a continuous plastic film sheet (5) with a dummy sealing seam (6), which runs transversely to the sheet and extends across the entire width of the sheet, is provided,
    wherein the V-shaped side folds (2) are folded and the plastic film sheet (5) is welded with a longitudinal sealing seam (13) to form a plastic film tube (5'),
    wherein the side folds (2) are closed with sealing seams (8) at the bottom in the same manner as the front sides (1) of the plastic film tube (5'),
    wherein a blank (5") for an individual plastic film bag is created from the continuous plastic film tube (5') by means of a separation procedure,
    characterised in that the plastic film sheet (5) is additionally provided with a separately created mechanical weakening (7), which likewise extends across the entire width of the sheet, in the region of the dummy sealing seam (6).
  5. Method according to Claim 4, characterised in that the bottom surface (3) of the plastic film bag is subsequently formed by folding over the perimetric dummy sealing seam (6) of an individual blank (5").
  6. Method according to Claim 5, characterised in that the mechanical weakening was created by means of light stamping, light cutting, embossing or a laser procedure.
  7. Method according to Claim 5 or 6, characterised in that the end section of the blank (5") closed by the sealing seams (9, 10) is folded transversely to the plastic film sheet (5) against the bottom surface (3) and adhesively bonded to the bottom surface.
  8. Method according to Claim 7, characterised in that the continuous plastic film sheet (5) is provided with punched out sections (12) which leads to a gap in the region of the side folds (2).
  9. Method according to one of Claims 5 to 8, characterised in that the sealing seams (8, 9, 10) for the closing of the side folds (2) at the bottom are provided obliquely to the plastic film tube (5).
EP06007113A 2006-04-04 2006-04-04 Film bag and method for manufacturing the same Not-in-force EP1842784B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE502006004371T DE502006004371D1 (en) 2006-04-04 2006-04-04 Film bag and method for producing a film bag
EP06007113A EP1842784B1 (en) 2006-04-04 2006-04-04 Film bag and method for manufacturing the same
AT06007113T ATE437810T1 (en) 2006-04-04 2006-04-04 FILM BAG AND METHOD FOR PRODUCING A FILM BAG
PCT/EP2007/002730 WO2007112898A1 (en) 2006-04-04 2007-03-28 Film bag and method of producing a film bag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06007113A EP1842784B1 (en) 2006-04-04 2006-04-04 Film bag and method for manufacturing the same

Publications (2)

Publication Number Publication Date
EP1842784A1 EP1842784A1 (en) 2007-10-10
EP1842784B1 true EP1842784B1 (en) 2009-07-29

Family

ID=36829830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06007113A Not-in-force EP1842784B1 (en) 2006-04-04 2006-04-04 Film bag and method for manufacturing the same

Country Status (4)

Country Link
EP (1) EP1842784B1 (en)
AT (1) ATE437810T1 (en)
DE (1) DE502006004371D1 (en)
WO (1) WO2007112898A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4079655A1 (en) * 2021-04-23 2022-10-26 Mondi AG Packaging bag and method for producing the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
YU139471A (en) * 1970-06-11 1984-08-31 Jentsch Hans G Method of manufcturing bags from multifoil plastics
US4526565A (en) * 1983-02-23 1985-07-02 Linear Films, Inc. Method of making flat bottom plastic bag
US6319184B1 (en) * 1998-06-09 2001-11-20 Bob Dematteis Co. Apparatus and process for producing cold seal in plastic bags
FR2833928B1 (en) * 2001-12-26 2004-02-13 Autobar Flexible France PACKAGING BAG WITH PREFORMED FONF

Also Published As

Publication number Publication date
ATE437810T1 (en) 2009-08-15
DE502006004371D1 (en) 2009-09-10
WO2007112898A1 (en) 2007-10-11
EP1842784A1 (en) 2007-10-10

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