EP2818311B1 - Verfahren zur Herstellung von Längsfalten in einer flexiblen Folie - Google Patents

Verfahren zur Herstellung von Längsfalten in einer flexiblen Folie Download PDF

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Publication number
EP2818311B1
EP2818311B1 EP14173132.3A EP14173132A EP2818311B1 EP 2818311 B1 EP2818311 B1 EP 2818311B1 EP 14173132 A EP14173132 A EP 14173132A EP 2818311 B1 EP2818311 B1 EP 2818311B1
Authority
EP
European Patent Office
Prior art keywords
film
folding
fold
wheels
opposite sides
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
EP14173132.3A
Other languages
English (en)
French (fr)
Other versions
EP2818311A1 (de
Inventor
Paolo Roso
Luigi Vivian
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.)
PFM SpA
Original Assignee
PFM SpA
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 PFM SpA filed Critical PFM SpA
Publication of EP2818311A1 publication Critical patent/EP2818311A1/de
Application granted granted Critical
Publication of EP2818311B1 publication Critical patent/EP2818311B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/36—Folding sheets, blanks or webs by continuously feeding the sheets, blanks or webs to stationary members, e.g. plates, ploughs or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/008—Stiffening or reinforcing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/644—Making seals parallel to the direction of movement, i.e. longitudinal sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B2220/00—Specific aspects of the packaging operation
    • B65B2220/12—Creating additional longitudinal welds on horizontal or vertical form fill seal [FFS] machines for stiffening packages or for creating package edges

Definitions

  • the present invention relates to a device comprising folding means for forming at least one longitudinal fold in a web of flexible film, and to the corresponding folding method.
  • a device of this type may typically be incorporated in a packaging machine which also comprises, downstream of the device, means for shaping the longitudinally folded film into a tubular form, and then sealing and cutting it transversely, so as to produce tubular packages sealed in the form of bags, after the products for packaging have been introduced into them.
  • the present invention therefore relates solely to the folding of open films, that is to say films that are not sealed to form tubes, by joining their side edges, until they have been folded.
  • the longitudinal folds are generally located at the edges of the package so as to stiffen it, while leaving the main faces free for the printing of advertising messages, decorations, and the like. On the other hand, these folds may be located in any portion of the package if required.
  • GB2354969 A discloses a method for forming longitudinal folds in a web of flexible film prior to shaping the folded film into a tubular form. For forming the folds the film is guided along stationary folding plates wherein adjacent plates are arranged in an overlapping configuration.
  • the object of the present invention is therefore to provide a folding method which is an improvement on the prior art methods, and which is, in particular, free of the aforementioned drawbacks.
  • this object is achieved by means of a method comprising:
  • the parts of the device intended to form the folds are therefore idle wheels, which, because of their intrinsic characteristics and their arrangement, are able to interact with the film as gently as possible, without subjecting it to undue stress.
  • first and second wheels are provided with means for adjusting the distance separating the respective axes, in such a way that the device of the invention can form folds of different sizes according to the specific requirements of the user.
  • the web of flexible film is made of paper material.
  • a device for forming longitudinal folds in a web of flexible film 10, particularly one made of paper material comprises guide rollers 12 ( Figures 1 - 4 ) which direct the film towards a forming shoulder.
  • the film 10 to be folded has lateral edges - that is to say, edges parallel to the direction of advance - which are not engaged with one another.
  • the forming shoulder is shaped as a plate 14 placed on a substantially vertical plane and having an upper edge whose central part 16 is substantially horizontal and in contact with the film 10 and whose side parts 18 are inclined and spaced apart from the film 10.
  • the device Downstream of the plate, the device comprises folding means for forming a respective longitudinal fold 20 in each lateral part of the film 10.
  • the folding means comprise, for forming each fold 20, two pairs, each formed by a first 22a and a second 22b idle wheel, and arranged in sequence with respect to a descending portion of the path of the film 10.
  • the wheels 22a, 22b of each pair are placed so as to be offset and substantially parallel to one another on opposite sides of the film 10, and have axes 24 which are substantially orthogonal to the general plane of the film 10 in the contact area.
  • the axes 24 are separated by a distance d which is smaller than the diameters of the wheels 22a, 22b, which are the same in the illustrated example. If these diameters are different, the distance between the two axes 24 must be less than the larger of these diameters.
  • an area of overlap of the offset wheels 22a, 22b is created, forming a forced passage for the corresponding portion of film 10.
  • the wheels 22a, 22b of each pair may also be provided with means (not visible in the figures) for adjusting the distance separating the respective axes 24.
  • the wheels 22a are mounted on a support plate 26.
  • the support of the wheels 22b is not shown, for the sake of clarity in the drawing.
  • a pair of opposing rollers 28 is placed downstream of the folding means, these rollers being placed facing each other on opposite sides of the film 10 and having axes parallel to the general plane of the film 10 in the contact area.
  • the film 10 advances in the direction indicated by the arrow 30, and its passage over the shoulder 14 relieves the stresses in its lateral regions, which are to be subjected to the action of the folding wheels 22a, 22b, while the plane of the film 10 is kept substantially unchanged; in other words, the film is not subjected to rotation about its median longitudinal axis.
  • the wheels 22a, 22b (see Fig. 4 in particular) cause a fold 20, having the profile of an S with two bends, to be formed in each lateral region of the film 10.
  • the folds 20 are then made permanent by passing through the pair of opposing rollers 28.
  • the passage through the rollers 28 causes the permanent adhesion of the two branches of one of the two bends of each fold 20.
  • the adhering bends are those in the upper position of each fold 20.
  • the folds 20 are made permanent, in a known way, by heat sealing means placed farther downstream of the rollers 28.
  • Figures 5a - 5d show various embodiments of the sealing means, which may therefore respectively include, for each fold 20, a single sliding shoe 32, a pair of sliding shoes 34 placed on opposite sides of each fold 20, a pair of wheels 36 placed on opposite sides of each fold 20, or a pair of belts 38 placed on opposite sides of each fold 20.
  • the folded film 10 is then shaped, in a known way which is not illustrated in the figures, into a tubular form and is filled with the product to be packaged, and is also sealed and cut transversely, so as to produce tubular packages sealed in the form of bags.
  • These operations can be carried out by any packaging machine, for example a horizontal or vertical machine, which incorporates the folding device described above.
  • the folded film can be rewound on to a reel, and can subsequently be shaped and cut into three-dimensional packages by a packaging machine, this operation taking place at a later time.
  • the folds 20 are made to be present at the edges of the individual cut packages so as to form reinforcing elements, although in principle they may be located at any position.
  • Figures 6 to 8 show another embodiment of a device for performing the folding step of the method of the invention, in which numbers identical to those used in the preceding figures denote identical or equivalent parts.
  • the structure illustrated previously is essentially duplicated to provide two folding stations arranged in series, one after the other, with the provision of further intermediate guide rollers 40 and a final guide roller 42.
  • Each station can be used to form two longitudinal folds 20, so that the final sheet has four folds 20.
  • the number and sizes of the folds 20 formed in each station can be chosen as desired, provided that they are compatible with the geometrical constraints of the package to be formed, the distance between the axes 24 of the wheels 22a, 22b of each pair being varied if required.

Landscapes

  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Making Paper Articles (AREA)

Claims (13)

  1. Verfahren, umfassend:
    - einen Faltschritt zum Bilden mindestens einer Längsfalte (20) in einer Bahn aus einem flexiblen Flächengebilde (10) unter Verwendung eines Faltmittels, das zur Bildung jeder Falte (20) mindestens ein erstes und ein zweites mitlaufendes Rad (22a, 22b) umfasst, die versetzt und im Wesentlichen parallel zueinander auf gegenüber liegenden Seiten des Flächengebildes (10) angeordnet sind und Achsen (24) aufweisen, die im Wesentlichen orthogonal zu der allgemeinen Ebene des Flächengebildes (10) sind, wobei die Achsen (24) mit einem Abstand getrennt sind, der kleiner ist als der Durchmesser von mindestens einem der Räder (22a, 22b) und
    - einen anschließenden Schritt des Formens des gefalteten Flächengebildes (10) zu einer Schlauchform.
  2. Verfahren nach Anspruch 1, bei dem die Räder (22a, 22b) den gleichen Durchmesser aufweisen.
  3. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die ersten und die zweiten Räder (22a, 22b) mit Mitteln zum Einstellen des Abstands, der die jeweiligen Achsen (24) trennt, versehen sind.
  4. Verfahren nach einem der vorhergehenden Ansprüche, umfassend einen Schritt des Verminderns der Spannungen in den Bereichen des Flächengebildes (10), die gefaltet werden sollen, durch eine Formleiste, die stromaufwärts von dem Faltmittel angeordnet ist.
  5. Verfahren nach Anspruch 4, bei dem die Leiste als eine Platte (14), die eine obere Kante aufweist, geformt ist, deren zentraler Teil (16) im Wesentlichen horizontal und in Kontakt mit dem Flächengebilde (10) steht und deren Seitenteile (18) geneigt und von dem Flächengebilde (10) beabstandet sind.
  6. Verfahren nach Anspruch 4 oder 5, bei dem die Ebene, in der das Flächengebilde (10) liegt, auf dem Weg von dem Spannungsverminderungsschritt zu dem Faltschritt im Wesentlichen unverändert bleibt.
  7. Verfahren nach einem der vorhergehenden Ansprüche, bei dem sich ein Paar von gegenüber liegenden Walzen (28), die so angeordnet sind, dass sie auf gegenüber liegenden Seiten des Flächengebildes (10) einander gegenüber liegen und Achsen aufweisen, die parallel zu der allgemeinen Ebene des Flächengebilde (10) sind, stromabwärts von dem Faltmittel befindet.
  8. Verfahren nach einem der vorhergehenden Ansprüche, bei dem Mittel zum Siegeln durch Erwärmen der mindestens einen Längsfalte (20) stromabwärts von dem Faltmittel angeordnet sind.
  9. Verfahren nach Anspruch 8, bei dem die Mittel zum Siegeln ein einzelnes Gleitstück (32), ein Paar von Gleitstücken (34), die auf gegenüber liegenden Seiten der Falte (20) angeordnet sind, ein Paar von Rädern (36), die auf gegenüber liegenden Seiten der Falte (20) angeordnet sind, oder ein Paar von Riemen (38), die auf gegenüber liegenden Seiten der Falte (20) angeordnet sind, umfassen.
  10. Verfahren nach einem der vorhergehenden Ansprüche, bei dem der Faltschritt durch mindestens zwei Faltstationen ausgeführt wird, die in Reihe eine nach der anderen angeordnet sind.
  11. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die Bahn aus dem flexiblen Flächengebilde (10) aus einem Papiermaterial hergestellt ist.
  12. Verfahren nach einem der vorhergehenden Ansprüche, bei dem der Faltschritt in einem absteigenden Abschnitt des Wegs des Flächengebildes (10) durchgeführt wird.
  13. Verfahren nach einem der vorhergehenden Ansprüche, das nach dem Formschritt einen Schritt des Füllens des Flächengebildes (10), das zu einer Schlauchform ausgebildet ist, mit einem zu verpackenden Produkt, und Schritte des Siegelns und Querschneidens des schlauchförmigen Flächengebildes umfasst, so dass schlauchförmige Verpackungen erzeugt werden, die in der Form von Beuteln gesiegelt sind.
EP14173132.3A 2013-06-20 2014-06-19 Verfahren zur Herstellung von Längsfalten in einer flexiblen Folie Not-in-force EP2818311B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000510A ITTO20130510A1 (it) 2013-06-20 2013-06-20 Dispositivo per la realizzazione di pieghe longitudinali in un film flessibile

Publications (2)

Publication Number Publication Date
EP2818311A1 EP2818311A1 (de) 2014-12-31
EP2818311B1 true EP2818311B1 (de) 2016-02-03

Family

ID=48877466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14173132.3A Not-in-force EP2818311B1 (de) 2013-06-20 2014-06-19 Verfahren zur Herstellung von Längsfalten in einer flexiblen Folie

Country Status (3)

Country Link
EP (1) EP2818311B1 (de)
ES (1) ES2569998T3 (de)
IT (1) ITTO20130510A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4097012B1 (de) * 2020-01-31 2024-01-03 AETNA GROUP S.p.A. Verfahren und vorrichtung zum umhüllen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019104158A (ja) * 2017-12-12 2019-06-27 株式会社東京自働機械製作所 ヘム成形装置
EP4247712A1 (de) * 2020-11-18 2023-09-27 GEA Food Solutions Weert B.V. Vertikaler durchlaufverpackungsapparat mit verbesserter eckfaltung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1215715A (en) * 1967-03-31 1970-12-16 Canadian Ind Apparatus for forming gusseted plastics tubing
FR2617123B1 (fr) * 1987-06-26 1989-12-29 Newtec Int Bande avec renfort longitudinal, procede d'emballage et emballage comportant une telle bande, installation et machine pour la mise en oeuvre du procede d'emballage, et dispositif pour la realisation d'une telle bande
GB2354969A (en) * 1999-10-07 2001-04-11 Molins Plc A method of making bags which feature longitudinally reinforcing folds
DE10159053A1 (de) * 2001-11-30 2003-06-12 Bosch Gmbh Robert Verfahren und Vorrichtung zum Herstellen von Beutelpackungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4097012B1 (de) * 2020-01-31 2024-01-03 AETNA GROUP S.p.A. Verfahren und vorrichtung zum umhüllen

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Publication number Publication date
ES2569998T3 (es) 2016-05-13
EP2818311A1 (de) 2014-12-31
ITTO20130510A1 (it) 2014-12-21

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