EP2818311A1 - Method for forming longitudinal folds in a flexible film - Google Patents

Method for forming longitudinal folds in a flexible film Download PDF

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Publication number
EP2818311A1
EP2818311A1 EP14173132.3A EP14173132A EP2818311A1 EP 2818311 A1 EP2818311 A1 EP 2818311A1 EP 14173132 A EP14173132 A EP 14173132A EP 2818311 A1 EP2818311 A1 EP 2818311A1
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.)
Granted
Application number
EP14173132.3A
Other languages
German (de)
French (fr)
Other versions
EP2818311B1 (en
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
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Filing date
Publication date
Application filed by PFM SpA filed Critical PFM SpA
Publication of EP2818311A1 publication Critical patent/EP2818311A1/en
Application granted granted Critical
Publication of EP2818311B1 publication Critical patent/EP2818311B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00Making rigid or semi-rigid containers, e.g. boxes or cartons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00Making flexible containers, e.g. envelopes or bags
    • B31B70/26Folding sheets, blanks or webs
    • B31B70/262Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26Folding sheets, blanks or webs
    • B31B50/36Folding sheets, blanks or webs by continuously feeding the sheets, blanks or webs to stationary members, e.g. plates, ploughs or cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00Making flexible containers, e.g. envelopes or bags
    • B31B70/008Stiffening or reinforcing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00Making flexible containers, e.g. envelopes or bags
    • B31B70/60Uniting opposed surfaces or edges; Taping
    • B31B70/64Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/644Making seals parallel to the direction of movement, i.e. longitudinal sealing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B2220/00Specific aspects of the packaging operation
    • B65B2220/12Creating additional longitudinal welds on horizontal or vertical form fill seal [FFS] machines for stiffening packages or for creating package edges

Definitions

  • 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.
  • 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.
  • 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.
  • 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.
  • 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)

Abstract

The method comprises a folding step for forming longitudinal folds (20) in a web of flexible film (10) using folding means comprising, for each fold (20), a first and a second idle wheel (22a, 22b), which are arranged offset and substantially parallel to each other on opposite sides of the film (10) and have axes (24) which are orthogonal to the general plane of the film (10), these axes (24) being separated by a distance smaller than the diameter of at least one of the wheels (22a, 22b); and a subsequent step of shaping the folded film (10) into a tubular form.

Description

  • 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.
  • With known folding devices, however, the formation of longitudinal folds has proved to be difficult, particularly in the case of films of fragile materials such as paper materials, which may be broken, torn, or damaged in similar ways.
  • 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.
  • According to the invention, this object is achieved by means of a method comprising:
    • a folding step for forming at least one longitudinal fold in a web of flexible film, using folding means comprising, for forming each fold, at least a first and a second idle wheel, which are arranged offset and substantially parallel to each other on opposite sides of the film and have axes which are substantially orthogonal to the general plane of the film or the plane in which the film lies, these axes being separated by a distance smaller than the diameter of at least one of said wheels, and
    • a subsequent step of shaping the folded film into a tubular form, that to say a sealed form.
  • According to the invention, 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.
  • Advantageously, according to the invention it is also possible to provide, upstream of the folding wheels, a forming shoulder which relieves in advance any stresses that may have accumulated previously in the regions of the film to be folded.
  • Also advantageously, the 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.
  • Preferably, the web of flexible film is made of paper material.
  • Other advantages and characteristics of the present invention will become clear from the following detailed description, which is given by way of non-limiting example with reference to the attached drawings, in which:
    • Figure 1 is a schematic perspective view of a device for the execution of a method comprising a folding step according to the invention,
    • Figure 2 is a front elevation view of the device of Figure 1,
    • Figure 3 is a sectional view taken along the line III-III of Figure 2,
    • Figure 4 is a sectional view taken along the line IV-IV of Figure 2, in which, for greater clarity, the folded film is also shown spaced apart from the device,
    • Figures 5a - 5d show schematically respective sealing means provided in the device according to the preceding figures,
    • Figure 6 is a schematic perspective view of a serially operating device for the execution of the folding step of a method according to the invention,
    • Figure 7 is a front elevation view of the device of Figure 6, and
    • Figure 8 is a side elevation view of the device of Figure 6.
  • 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. As is apparent from the figures, 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.
  • 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. In all cases, 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.
  • Additionally, 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.
  • In operation, 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.
  • If one face of the film 10 has been pre-coated with adhesive material in the folding areas, the passage through the rollers 28 causes the permanent adhesion of the two branches of one of the two bends of each fold 20. Assuming that the adhesive material has been placed on the face of the film 10 facing downwards in Figure 4, the adhering bends are those in the upper position of each fold 20.
  • However, if no area of the film 10 has been pre-coated with adhesive material, 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. Alternatively, 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.
  • Typically, 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.
  • In this case, 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. Clearly, 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.
  • Naturally, the principle of the invention remaining the same, the details of construction and the forms of embodiment may be varied widely with respect to those described, which have been given purely by way of example, without thereby departing from the scope of the invention as defined in the attached claims. For example, a desired number of pairs of wheels can be provided for forming each fold, and the folding process can be carried out on a film which is positioned horizontally or inclined with respect to the vertical.

Claims (13)

  1. Method comprising:
    - a folding step for forming at least one longitudinal fold (20) in a web of flexible film (10) using folding means comprising, for forming each fold (20), at least a first and a second idle wheel (22a, 22b), which are arranged offset and substantially parallel to each other on opposite sides of the film (10) and have axes (24) which are substantially orthogonal to the general plane of the film (10), said axes (24) being separated by a distance smaller than the diameter of at least one of said wheels (22a, 22b), and
    - a subsequent step of shaping the folded film (10) into a tubular form.
  2. Method according to Claim 1, in which said wheels (22a, 22b) have the same diameter.
  3. Method according to any of the preceding claims, in which said first and second wheels (22a, 22b) are provided with means for adjusting the distance separating the respective axes (24).
  4. Method according to any of the preceding claims, comprising a step of relieving the stresses in the regions of the film (10) to be folded by means of a forming shoulder placed upstream of said folding means.
  5. Method according to Claim 4, in which said shoulder is shaped as a plate (14) 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).
  6. Method according to Claim 4 or 5, in which the plane in which the film (10) lies remains substantially unchanged in the passage from the stress relieving step to the folding step.
  7. Method according to any of the preceding claims, in which a pair of opposing rollers (28), placed facing each other on opposite sides of the film (10) and having axes parallel to the general plane of the film (10), is located downstream of the folding means.
  8. Method according to any of the preceding claims, in which means of sealing by heating said at least one longitudinal fold (20) are placed downstream of the folding means.
  9. Method according to Claim 8, in which said sealing means include a single sliding shoe (32), a pair of sliding shoes (34) placed on opposite sides of the fold (20), a pair of wheels (36) placed on opposite sides of the fold (20) or a pair of belts (38) placed on opposite sides of the fold (20).
  10. Method according to any of the preceding claims, in which said folding step is performed by at least two folding stations placed in series, one after the other.
  11. Method according to any of the preceding claims, in which said web of flexible film (10) is made of paper material.
  12. Method according to any of the preceding claims, in which said folding step is performed in a descending portion of the path of the film (10).
  13. Method according to any of the preceding claims, comprising, after the shaping step, a step of filling with a product to be packaged the film (10) shaped into a tubular form, and steps of sealing and transverse cutting of said tubular film, so as to produce tubular packages sealed in the form of bags.
EP14173132.3A 2013-06-20 2014-06-19 Method for forming longitudinal folds in a flexible film Not-in-force EP2818311B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000510A ITTO20130510A1 (en) 2013-06-20 2013-06-20 DEVICE FOR THE REALIZATION OF LONGITUDINAL FOLDS IN A FLEXIBLE FILM

Publications (2)

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

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14173132.3A Not-in-force EP2818311B1 (en) 2013-06-20 2014-06-19 Method for forming longitudinal folds in a flexible film

Country Status (3)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019104158A (en) * 2017-12-12 2019-06-27 株式会社東京自働機械製作所 Hem molding device
IT202000001984A1 (en) * 2020-01-31 2021-07-31 Aetna Group Spa Method and apparatus for wrapping
WO2022106226A1 (en) * 2020-11-18 2022-05-27 Gea Food Solutions Weert B.V. Vertical flow-wrapper with improved corner folding

Citations (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
EP0300855A1 (en) * 1987-06-26 1989-01-25 Newtec International Web with longitudinal reinforcement, its manufacture and its use in packaging methods and device for making such a web
GB2354969A (en) * 1999-10-07 2001-04-11 Molins Plc A method of making bags which feature longitudinally reinforcing folds
WO2003047976A1 (en) * 2001-11-30 2003-06-12 Robert Bosch Gmbh Method and device for the production of packaging in bags

Patent Citations (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
EP0300855A1 (en) * 1987-06-26 1989-01-25 Newtec International Web with longitudinal reinforcement, its manufacture and its use in packaging methods and device for making such a web
GB2354969A (en) * 1999-10-07 2001-04-11 Molins Plc A method of making bags which feature longitudinally reinforcing folds
WO2003047976A1 (en) * 2001-11-30 2003-06-12 Robert Bosch Gmbh Method and device for the production of packaging in bags

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019104158A (en) * 2017-12-12 2019-06-27 株式会社東京自働機械製作所 Hem molding device
IT202000001984A1 (en) * 2020-01-31 2021-07-31 Aetna Group Spa Method and apparatus for wrapping
WO2021152522A1 (en) * 2020-01-31 2021-08-05 Aetna Group S.P.A. Method and apparatus for wrapping
CN115038645A (en) * 2020-01-31 2022-09-09 埃特纳集团股份公司 Method and apparatus for wrapping
CN115038645B (en) * 2020-01-31 2024-02-23 埃特纳集团股份公司 Method and unfolding device for wrapping a load
WO2022106226A1 (en) * 2020-11-18 2022-05-27 Gea Food Solutions Weert B.V. Vertical flow-wrapper with improved corner folding

Also Published As

Publication number Publication date
EP2818311B1 (en) 2016-02-03
ES2569998T3 (en) 2016-05-13
ITTO20130510A1 (en) 2014-12-21

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