FORM FILL SEAL MACHINE FOR A BAG WITH A BAND

Abstract

The invention relates to a form fill seal machine (200) for producing and filling a bag (100) with a band, said bag comprising a first sheet (112) and a second sheet (114) that together form a first edge (117) and a second edge (118) of the bag, and a band closing device (120), the machine comprising:a device (210) configured to feed a film (1) onto the machine,a conveying device (215) configured to position at least one band (136) on the film,a folding device (240) configured to fold the film (1) in such a way as to form the first sheet (112) and the second sheet (114) of the bag,welding jaws (245a, 245b) configured to weld the first sheet (112) and the second sheet (114) in such a way as to close two sides of the bag and leave a third side of the bag open,a filling chute (250) configured to fill the bag via the third side of the bag, andwelding jaws (255) configured to close the bag by sealing the third side.

Claims

1. A form-fill-seal machine (200, 300, 400, 500) for manufacturing and filling a tape bag (100), said bag including a first sheet (112) and a second sheet (114) forming together a first edge (117) and a second edge (118) of the bag, and a tape closing device (120), the form-fill-seal machine comprising: a device (210, 310, 410, 510) configured to guide a film (1) on the machine, a conveying device (215, 315, 415, 515) configured to position at least one tape (136, 146) on the film, a folding device (240, 340, 440, 540) configured to fold the film (1) so as to form the first sheet (112) and the second sheet (114) of the bag, first and second welding jaws (245a-b, 345a-b, 445a-b, 545a-b) configured to weld the first sheet (112) and the second sheet (114) so as to close two sides of the bag and leave a third side of the bag open, a filling chute (250, 350, 450, 550) configured to fill the bag by the third side of the bag, and third welding jaws (255, 355, 455, 555) configured to close the bag by sealing the third side.

2. The machine (200, 300, 400, 500) according to claim 1, wherein the conveying device (215, 315, 415, 515) is configured to position two tapes (136, 146) on the film (1), said tapes extending substantially parallel relative to each other.

3. The machine (200, 300, 400, 500) according to claim 1, further comprising a device (225, 325, 425, 425) configured to form a channel (130, 140) configured to receive the tape (136, 146), by fastening a strip (139, 149) welded above the tape or by folding and welding of the film (1) above the tape.

4. The machine (200, 300, 400, 500) according to claim 1, wherein the conveying device (215, 315, 415, 515) is configured to position the tape (136, 146) in a direction transversal to a travel direction of the film (1).

5. The machine (300) according to claim 4, wherein: the folding device (340) comprises a former, the first welding jaws (345a) are configured to weld the first edge (117) of the bag, and the second and third welding jaws (345b, 355) are combined and configured to weld successively the bottom (116) and the mouth (119) of the bag.

6. The machine (300) according to claim 5, wherein the conveying device (315) is configured to position two tapes (136, 146) on the film (1), said tapes extending substantially parallel relative to each other.

7. The machine (300) according to claim 6, wherein the conveying device (315) is configured to position the tapes (136, 146) on the film (1) such that the first tape (136) is adjacent to a first side of the film and the second tape (146) is adjacent to a second side of the film, the first tape (136) and the second tape (146) being of length substantially equal to half the width of the film, such that the first tape and the second tape are substantially offset relative to each other in a direction perpendicular to the travel direction of the film.

8. The machine (300) according to claim 7, further comprising a device (320) configured to form a first notch (137) in the first side of the film in a zone of the film intended to receive the first tape (136), and a second notch (147) in a central zone of the film, in a zone of the film intended to receive the second tape (146), such that during folding of the film (1) by the folding device (340), the first notch (137) is located at the first edge (117) of the bag and the second notch (147) is located at the second edge (118) of the bag.

9. The machine (300) according to claim 6, further comprising fourth welding jaws (335) configured to weld the first tape (136) on the second edge (118) of the bag and the second tape (146) on the first edge (117) of the bag.

10. The machine (300) according to claim 5, wherein: the conveying device (315) is configured to position the tape (136) on the film (1) such that said tape protrudes on either side of said film, and the folding device (340) is configured to fold the film (1) such that the free ends of the tape (136) are adjacent.

11. The machine (200) according to claim 4, wherein: the folding device (240) is configured to form the second edge (118) of the bag, and the first and the second welding jaws (245a, 245b) are combined and configured to weld successively the bottom (116) and the mouth (119) of the bag, and the third welding jaws (255) are configured to weld the first edge (117) of the bag.

12. The machine (200, 300) according to claim 10, further comprising fourth welding jaws (235, 335) configured to weld the tape (136) to the film (1): either at a zone of the film intended to form the second edge (118) of the bag, so as to weld the tape (136) both on the second sheet (114) and on the first sheet (112), or in a zone of the film intended to form the first edge (117) of the bag, the tape (136) not being fixed on the second sheet (114).

13. The machine (200, 300) according to claim 12, wherein the fourth welding jaws (235, 335) and the first welding jaws (245a) or the third welding jaws (355) are combined and are configured to weld the tape (136) on the first sheet (112) at the first edge (117) of the bag, the tape not being fixed on the second sheet (114).

14. The machine (400, 500) according to claim 1, wherein the conveying device (415, 515) is configured to position two tapes (136, 146) on the film (1), said tapes extending substantially parallel relative to each other in the travel direction of the film, such that the first tape (136) is adjacent to a first side of the film (1) and the second tape (146) is adjacent to a second side of the film (1).

15. The machine (500) according to claim 14, wherein: the folding device (540) comprises a former, the first welding jaws (545a) are configured to weld the mouth (119) of the bag, and the second and the third welding jaws (545b, 555) are combined and are configured to weld successively the first edge (117) of the bag and the second edge (118) of the bag.

16. The machine (400) according to claim 14, wherein: the folding device (440) is configured to form the bottom (116) of the bag, and the first and the second welding jaws (445a, 445b) are combined and are configured to weld successively the first edge (117) and the second edge (118) of the bag, and the third welding jaws (455) are configured to weld the mouth (119) of the bag.

17. The machine (400, 500) according to claim 14, further comprising fourth welding jaws (435, 535) configured to weld: either the first tape (136) on the second edge (118) of the bag and the second tape (146) on the first edge (117) of the bag, or the first tape (136) and the second tape (146) together, or the first tape (136) and the second tape (146) on the second edge (118) of the bag, or the first tape (136) in a zone at a distance from the second edge (118) of the bag and the second tape (146) in a zone at a distance from the first edge (117) of the bag.

18. The machine (400, 500) according to claim 17, wherein the fourth welding jaws (435, 535) are combined with the first or the second welding jaws (445a, 445b) or are combined with the second or the third welding jaws (545b, 555).

19. A method (S10, S20) for manufacturing and filling a tape bag (100) by means of a form-fill-seal machine (200, 300, 400, 500), said bag comprising a first sheet (112) and a second sheet (114) forming together a first edge (117) and a second edge (118) of the bag, and a tape closing device (120), the manufacturing and filling method comprising the following steps: guiding (S11, S21) a film (1) on the machine, positioning (S13, S23) at least one tape (136, 146) on the film, folding (S16, S26) the film (1) so as to form the first sheet (112) and the second sheet (114) of the bag, welding (S17, S27) the first sheet (112) and the second sheet (114) so as to close two sides of the bag and leave a third side of the bag open, filling (S18, S28) the bag (100) via the third side of the bag, and closing (S19, S29) the bag (100) by sealing the third side.

20. The method (S10, S20) according to claim 19, wherein two tapes (136, 146) are positioned (S13, S23) on the film (1), said tapes extending substantially parallel relative to each other.

21. The method (S10, S20) according to claim 19, wherein is formed (S14, S24) a channel (130, 140) configured to receive the tape (136, 146), by fastening a strip (139, 149) welded above the tape or by folding and welding of the film above the tape.

22. The method (S10) according to claim 19, wherein the tape (136, 146) is positioned (S13) in a direction transversal to a travel direction of the film (1).

23. The method (S10) according to claim 22, wherein the film (1) is folded (S16) so as to form the second edge (118) of the bag, the first and the second sheet (112, 114) are welded (S17) so as to form the first edge (117) and the bottom (116) of the bag, the bag is closed (S19) by sealing the mouth (119) of the bag.

24. The method (S10) according to claim 23, wherein two tapes (136, 146) are positioned (S13) on the film (1), said tapes extending substantially parallel relative to each other.

25. The method (S10) according to claim 24, wherein the tapes (136, 146) are positioned (S13) on the film (1) such that the first tape (136) is adjacent to a first side of the film and the second tape (146) is adjacent to a second side of the film, the first tape and the second tape being of length substantially equal to half the width of the film, such that the first tape and the second tape are substantially offset relative to each other in a direction perpendicular to the travel direction of the film.

26. The method (S10) according to claim 25, wherein a first notch (137) is formed (S12) in the first side of the film (1) in a zone of the film intended to receive the first tape (136), and a second notch (147) is formed (S12) in a central zone of the film (1), in a zone of the film intended to receive the second tape (146), such that during folding (S16) of the film, the first notch (137) is located at the first edge (117) of the bag and the second notch (147) is located at the second edge (118) of the bag.

27. The method (S10) according to claim 24, wherein the first tape (136) is welded (S15) on the second edge (118) of the bag and the second tape (146) is welded (S15) on the first edge (117) of the bag.

28. The method (S10) according to claim 23, wherein the tape (136) is positioned (S13) on the film (1) such that said tape protrudes on either side of said film, and the film is folded (S16) such that the free ends of the tape are adjacent.

29. The method (S10) according to claim 22, wherein: the film (1) is folded (S16) so as to form the second edge (118) of the bag, and the first and the second sheet (112, 114) are welded (S17) so as to form the bottom (116) and the mouth (119) of the bag, and the bag is closed (S19) by sealing the first edge (117) of the bag.

30. The method (S10) according to claim 28, wherein the tape (136) is welded (S15) to the film (1): either at a zone of the film (1) intended to form the second edge (118) of the bag, so as to weld the tape (136) both on the second sheet (114) and on the first sheet (112), or in a zone of the film (1) intended to form the first edge (117) of the bag, the tape (136) not being fixed on the second sheet (114).

31. The method (S10) according to claim 30, wherein the welding (S15) of the tape (136) occurs simultaneously with welding (S17) of the first and of the second sheet (112, 114) so as to weld the tape on the first sheet (112) at the first edge (117) of the bag, the tape not being fixed on the second sheet (114).

32. The method (S20) according to claim 19, wherein two tapes (136, 146) are positioned (S23) on the film (1), said tapes extending substantially parallel relative to each other in the travel direction of the film (1), such that the first tape (136) is adjacent to a first side of the film and the second tape (146) is adjacent to a second side of the film.

33. The method (S20) according to claim 32, wherein: the film (1) is folded (S26) so as to form the bottom (116) of the bag, the first and the second sheet (112, 114) are welded (S27) so as to form the mouth (119) and the first edge (117) of the bag, the bag is closed (S29) by sealing the second edge (118) of the bag.

34. The method (S20) according to claim 32, wherein: the film (1) is folded (S26) so as to form the bottom (116) of the bag, and the first and the second sheet (112, 114) are welded (S27) so as to form the first and the second edge (117, 118) of the bag, the bag is closed (S29) by sealing the mouth (119) of the bag.

35. The method (S20) according to claim 32, wherein: either the first tape (136) is welded (S25) on the second edge (118) of the bag (100) and the second tape (146) is welded (S25) on the first edge (117) of the bag, or the first tape (136) and the second tape (146) are welded (S25) together, or the first tape (136) and the second tape (146) are welded on the second edge (118) of the bag, or the first tape (136) is welded (S25) in a zone at a distance from the second edge (118) of the bag and the second tape (146) is welded (S25) in a zone at a distance from the first edge (117) of the bag.

36. The method (S20) according to claim 35, wherein the welding (S25) of the first and of the second tape (136, 146) occurs simultaneously with welding (S27) of the first and of the second sheet (112, 114) or with welding (S27) of the first and of the second sheet (112, 114) and with closing (S29) of the bag.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Other characteristics, aims and advantages of the present invention will emerge from the following detailed description and with respect to the appended drawings given by way of non-limiting examples and in which:

[0081] FIGS. 1 and 2 previously described illustrate an outer perspective view of a bag according to the state of the art, and a view in transversal section of the same bag known from the state of the art;

[0082] FIGS. 3a to 3e illustrate different examples of bags obtained by means of a form-fill-seal machine according to a first embodiment the invention;

[0083] FIG. 4 illustrates a flowchart of a method for implementing the form-fill- seal machine according to the first embodiment of the invention;

[0084] FIG. 5a illustrates a first example of a form-fill-seal machine according to the first embodiment of the invention;

[0085] FIG. 5b illustrates a second example of a form-fill-seal machine according to the first embodiment of the invention;

[0086] FIGS. 5c and 5d illustrate variants of the second example of a form-fill- seal machine according to the first embodiment of the invention;

[0087] FIGS. 6a to 6d illustrate different examples of bags obtained by means of a form-fill-seal machine according to a second embodiment of the invention;

[0088] FIG. 7 is a flowchart of a method for implementing the form-fill-seal machine according to the second embodiment of the present invention;

[0089] FIGS. 8a to 8c illustrate views in profile, section, of different examples of bags according to the second embodiment of the invention;

[0090] FIG. 9a illustrates a first example of a form-fill-seal machine according to the second embodiment of the invention; and

[0091] FIG. 9b illustrates a second example of a form-fill-seal machine according to the second embodiment of the invention.

DETAILED DESCRIPTION OF AN EMBODIMENT

[0092] In reference to the appended figures two embodiments of the invention will be described.

[0093] The first embodiment relates to a method for manufacturing a cord bag 100 on a form, fill and seal machine wherein the closing device 120 is received in the transversal direction, i.e., perpendicularly to the travel direction of the film in the machine.

[0094] The second embodiment as such relates to a method for manufacturing a cord bag 100 on a form, fill and seal machine in which the closing device 120 is received in a longitudinal direction, i.e., parallel to the travel direction of the film in the machine.

First Embodiment

Transverse Fastening of the Closing Device 120

[0095] FIGS. 3 to 5 illustrate several examples of tape bag 100, a method S10 for manufacturing and filling of a tape bag 100, and a form-fill-seal machine 200, 300 according to a first embodiment of the invention.

[0096] Examples of Tape Bag 100 According to the First Embodiment

[0097] FIGS. 3a to 3e illustrate examples of tape bags 100 which may be obtained according to a method S10 for manufacturing and filling of a tape bag 100 according to the first embodiment of the invention.

[0098] The bag 100 comprises a first sheet 112 and a second sheet 114 parallel and adjacent at rest, and attached together so as to form sides. Each of the sides of the first and second sheets 112, 114 corresponds to a bottom 116, two lateral edges 117, 118 parallel to each other and orthogonal to the bottom 116 and a mouth 119 parallel to the bottom 116 and orthogonal to the lateral edges 117, 118.

[0099] The material making up the film 1 is preferably heat-sealable material, especially thermoplastic material which may be welded. The plastic material may especially belong to the family of polyolefins and may comprise at least one among the following materials: polyethylene, polypropylene, low-density polyethylene, high-density polyethylene, or a copolymer of these monomers.

[0100] The sheets 112, 114 may be transparent. They may however be provided with any appropriate printing or decoration.

[0101] The sheets 112, 114 may be also made based on composite material by incorporating for example paper and/or metal sheets, for example in a sandwich structure. In this exemplary embodiment, the film 1 in the composite material comprises an inner face 113 formed in heat-sealable material, especially thermoplastic material. The plastic material may especially belong to the family of polyolefins and comprise at least one among the following materials: polyethylene, polypropylene, low-density polyethylene, high-density polyethylene, or a copolymer of these monomers.

[0102] The sheets 112, 114 are selected from material and thickness to ensure sufficient flexibility to the bag to allow its closing by swaging of a mouth 119 opposite the bottom 116. The sheets 112, 114 are therefore flexible.

[0103] In a first embodiment illustrated in FIGS. 3a to 3c, the bag 100 further comprises a closing device 120 comprising: [0104] a channel 130 extending along the two sheets 112, 114 of the bag 100 between the edges 117, 118, the channel 130 comprising a first end 132 and a second end 134 adjacent to the first edge 117, and [0105] a tape 136, housed in the channel 130 between the first end 132 and the second end 134 such that the two free ends of the tape 136 are flush with the channel 130 at the same edge 117 of the bag 100 and thus forms a loop. The tape 136 further projects from one at least of the ends 132, 134 of the channel 130.

[0106] Closing of the bag 100 is therefore done by pulling on the free ends of the tape 136 in the extension of the channel 130, in the same direction, by gripping the first edge 117 of the bag at which the tape 136 protrudes.

[0107] In the example illustrated in FIG. 3a, the tape 130 is left free to slide in the channel 130. It is clear that the loop formed by the tape 136 in its channel 130 limits the risk of the tape 136 not coming out of the channel 130, without needing to form a knot at its free ends.

[0108] According to a variant illustrated in FIGS. 3b and 3c, the tape 136 is welded to the channel 130. The tape 136 is for example welded to the channel 130 in a zone adjacent to the second edge 118 of the bag 100, as illustrated in FIG. 3b. In this example, the tape 136 is therefore welded in a zone extending overall at mid-distance from the ends 132, 134 of the channel 130. The tape 136 may therefore be welded either directly at the second edge 118, or at a short distance from the second edge 118. The tape 136 may also be welded to the channel 130 in a zone adjacent to the first end 132 of said channel 130, as illustrated in FIG. 3c. The tape 136 may be welded either directly at the first end 132 of the channel 130, or at a short distance from the first end 132. Here too, it is clear that welding 138 of the tape 136 to the channel 130 blocks the tape 136 in the channel 130 without needing to form a knot at its free ends.

[0109] In the examples illustrated in FIGS. 3a to 3c, the tape 136 protrudes from the first edge 117 of the channel 130. As a variant, the free ends 132, 134 of the tape 136 may also be welded together at their part protruding from the ends 132, 134 of the channel 130. In this case the length of the tape 136 may correspond overall to the length of the channel 130.

[0110] The bag 100 may also be provided with a notch 137 (or clearances) made at the ends 132, 134 of the channel 130 from which the tape 136 protrudes. The length of the tape 136 may be substantially equal to that of the channel 130, and offer easy handling by a user.

[0111] In a second embodiment illustrated in FIGS. 3d and 3e, the bag 100 comprises a closing device 120 comprising: [0112] a first channel 130 and a second channel 140 extending between the edges 117, 118 of the bag, respectively on the first and the second sheet 112, 114 of the bag 100, the first channel 130 and the second channel 140 each comprising a first end 132, 142 and a second end 134, 144, and [0113] a first tape 136, housed in the first channel 130, and a second tape 146, housed in the second channel 140, the first tape 136 protruding from the first end 132 of the first channel 130 and the second tape 146 protruding from the second end 144 of the second channel 140.

[0114] The first tape 130 is welded in a zone adjacent to the second end 134 of the first channel 130 and the second tape 146 is welded in a zone adjacent to the first end 142 of the second channel 140. The tapes 136, 146 may be welded either directly at the free ends 132, 144 respectively, or at a short distance from these free ends 132, 144.

[0115] In the example illustrated in FIG. 3d, the first end 132 of the first channel 130 and the first end 142 of the second channel 140 are adjacent to the first edge 117 of the bag 100. In this way, the first tape 136 and the second tape 146 protrude from their respective channel 130, 140 at an edge 117, 118 opposite the bag 100. Closing of the bag 100 is therefore done by pulling on the tapes 136, 146 in the extension of their respective channel 130, 140, in opposite directions. Those skilled in the art will understand that pulling on the emerging ends of each of the tapes 136, 146 easily achieves closing of the mouth 119.

[0116] As a variant illustrated in FIG. 3e, the first end 132 of the first channel 130 and the second end 144 of the second channel 140 are adjacent to the same edge 117 or 118 of the bag 100. In this way, the first tape 136 and the second tape 146 protrude from their respective channel 130, 140 at the same edge 117 or 118 of the bag 100. Closing of the bag 100 is therefore done by pulling on the tapes 136, 146 in the extension of their respective channel 130, 140, in the same direction. Those skilled in the art will understand that pulling on the emerging ends of each of the tapes 136, 146 by gripping the first edge 117 of the bag at which the tapes 136, 146 protrude easily achieves closing of the mouth 119.

[0117] The first channel 130 and the second channel 140 may be offset relative to each other according to the height of the bag 100, i.e., the second channel 140 may be closer to the mouth 119 of the bag 100 than the first channel 130, such that they are not superposed when the bag 100 is flattened. As a variant, the first and the second channel 130, 140 are not offset relative to each other according to the height of the bag 100, such that they are not superposed when the bag 100 is flattened.

[0118] In this second embodiment, the tapes 136, 146 do not project from the edges 117, 118 of the bag 100. The length of the tapes 136, 146 corresponds overall to the length of their respective channel 130, 140.

[0119] The bag 100 may further be provided with notches 137, 147 (or clearances) made at the ends 132, 144 of the channels 130, 140 from which the first and second tapes 136, 146 protrude. The length of the tape 136 may be substantially equal to that of the channel 130, and make for easy handling by a user.

[0120] Irrespective of the embodiment, the closing device 120 may be made at the mouth 119 or at a distance from the latter. For example, the closing device 120 may extend in the first quarter of the bag 100, typically two, preferably three centimeters from the mouth 119.

[0121] The tape(s) 136, 146 may be made in heat-sealable material, typically polyolefin comprising a polymer or a copolymer among the following materials: polypropylene and its copolymers, polyethylene and its copolymers, high-density polyethylene, low-density polyethylene. In this way during welding of the tape(s) 136, 146 onto the channel 130 or to their respective channel 130, 140, the end of the tape(s) 136, 146 melts and forms a solid junction with the channel 130 or their respective channel 130, 140.

[0122] In this case, for welding 138 of the tape(s) 136, 146 on the bag 100, the tape(s) 136, 146 may be made of material compatible with the material comprising the sheets 112, 114. For this purpose, the sheets 112, 114 (or at least their inner layer) and the tape(s) 136, 146 may especially be made of identical or similar material. For example, the sheets 112, 114 and the tape(s) 136, 146 may be made of polyethylene or polypropylene.

[0123] As a variant, the tape(s) 136, 146 are formed in non-fusible material (such as cotton or polyester for example), i.e., a material whereof the melting temperature is greater than the welding temperatures applied to the matter of the bag 100. The effect of fastening by welding 138 of the tape(s) 136, 146 to the channel 130 or to their respective channel 130, 140 is to mechanically trap the tape(s) 136, 146 in the welding 138. Welding 138 the channel(s) 130, 140 produces a shearing effect of the tape(s) 136, 146 to form connection points between the bag 100 and the tape(s) 136, 146.

[0124] Method S10 for Manufacturing and Filling a Tape Bag 100 According to the First Embodiment

[0125] The bags 100 according to the first embodiment may be obtained on a so-called horizontal 200 (FIG. 5a) or vertical 300 (FIGS. 5b to 5d) machine according to a manufacturing method S10 comprising the following steps.

[0126] During a first step S11, a film 1 intended to form the sheets 112, 114 of the bag 100 is guided on a form-fill-seal machine 200.

[0127] During a second step S12, optional, notches 137, 147 may be formed on the film 1, in the zone of the film 1 intended to receive the end(s) 132, 134 of the channel 130 or the ends 132, 144 of the channels 130, 140 from which the tapes 136, 146 protrude.

[0128] In the variant corresponding to the second embodiment, the zone intended to receive the ends 132, 144 of the channels 130, 140 may especially comprise one of the edges of the film and a central part of the film (for the bag of FIG. 3d for example), or the two edges of the film (for the bag of FIG. 3e for example). In this latter case, on completion of the method S10, the tapes 136, 146 will project from the first edge 117 of the bag 100. The zone intended to receive the ends 132, 144 of the channels 130, 140 may further comprise only a central part of the film (for the bag of FIG. 3e for example). In this latter case, on completion of the method S10, the tapes 136, 146 will project from the second edge 118 of the bag 100. The notches 137, 147 may be offset one relative to the other in the travel direction of the film 1, or else form only a single notch from which the tapes 136, 146 both protrude.

[0129] During a third step S13, a tape 136 is guided on the film 1, perpendicularly to a travel direction of the film 1. If needed, the tape 136 is placed on the film 1 such that a free end of the tape 136 is positioned at the notch 137.

[0130] In a variant corresponding to the second embodiment, during the third step S13, a second tape 146 is also guided on the film 1, perpendicularly to a travel direction of the film 1, if needed at the second notch 147. The first and second tapes 136, 146 are positioned offset relative to each other in the direction perpendicular to the travel direction of the film 1. The first tape 136 extends for example from a first side of the film 1 to a central zone of the film 1, whereas the second tape 146 extends from the central zone of the film 1 to a second side of the film 1. The first and second tapes 136, 146 may also be positioned offset relative to each other in the travel direction of the film 1.

[0131] During a fourth step S14, a strip 139 or strips 139, 149 intended to form the channel 130 or the channels 130, 140 are attached and welded on the film 1, above the tape 136 or the tapes 136, 146 such that the channel 130 or the channels 130, 140 extend perpendicularly to the travel direction of the film 1.

[0132] During a fifth step S15, optional, the tape 136 or the tapes 136, 146 may be welded to the channel 130 or to their respective channel 130, 140.

[0133] According to the first embodiment, the tape 136 may for example be welded to the channel 130 in a zone adjacent to one 132 of the ends of the channel 130. As a variant, the tape 136 may be welded to the channel 130 in a zone extending overall at mid-distance from the ends 132, 134 of the channel 130. According to yet another variant, the tape 136 is left free to slide in the channel 130.

[0134] According to the second embodiment, the first tape 136 is welded in a zone adjacent to the second end 134 of the first channel 130 and the second tape 146 is welded in a zone adjacent to the first end 142 of the second channel 140.

[0135] During a sixth step S16, the film 1 fitted with the tape 136 or tapes 136 is folded back on itself, along a folding line extending in the travel direction of the film 1, so as to form the first and the second sheets 112, 114. The folding line defines the second edge 118 of the bag 100.

[0136] In the second exemplary embodiment illustrated in FIGS. 5b to 5d, wherein the form-fill-seal machine 300 is vertical, the film 1 is guided to a former to fold back the film 1 on itself.

[0137] At this stage, the bag 100 is open at three of these sides.

[0138] During a seventh step S17, the first and the second sheet 112, 114 are welded together so as to close two of the three open sides of the bag 100.

[0139] In the first exemplary embodiment illustrated in FIG. 5a, the first and the second sheet 112, 114 are welded together, the welding forming the bottom 116 of a first bag 100 and the mouth 119 of the bag 100 downstream. The first and second sheets 112, 114 are therefore welded together twice so as to seal the bottom 116 and the mouth 119 of the bag 100. At this stage of the method illustrated in FIG. 5a, the obtained bag 100 has a bottom 116 and a sealed mouth 119, an edge 118 closed by folding, as well as an open edge 117. The mouth 119 is further equipped with a tape 136 housed in a channel 130 and optionally welded to said channel 130.

[0140] In the second exemplary embodiment illustrated in FIGS. 5b to 5d, the first and the second sheet 112, 114 are welded together, along a longitudinal weld forming the first edge 117 of the bag 100 in a direction parallel to the travel direction of the film, then along a transverse weld forming the bottom 116 of the bag 100 in a direction perpendicular to the direction of the film 1. In this second example, the longitudinal weld of the first and second sheets 112, 114 may further weld the tape 136 to itself at the ends 132, 134 of the channel 130 or weld the tape 136 to the first edge 117 of the bag 100 without fixing it to the second sheet 114 (for the bag 100 of FIG. 3c) or weld the tapes 136, 146 to the first edge 117 of the bag 100 (for the bag 100 of FIG. 3e). The transverse weld of the first and second sheets 112, 114 together further seals the mouth 119 of the downstream bag 100. At this stage of the method illustrated in FIGS. 5b to 5d, the obtained bags 100 then have a bottom 116 and sealed edges 117, 118, as well as an open mouth 119. The mouth 119 is further equipped with one or more tapes 136 housed in a channel 130, 140 and optionally welded to said channel 130, 140.

[0141] The sixth and seventh steps S16, S17 thus form the bag 100.

[0142] During an eighth step S18, the bag 100 is filled via the last of the sides of the bag 100 still open. In the first exemplary embodiment (FIG. 5a), the bag 100 is filled via the side intended to form the first edge 117 of the bag 100, whereas in the second exemplary embodiment (FIG. 5b), the bag 100 is filled via the side intended to form the mouth 119 of the bag 100.

[0143] During a ninth step S19, the first and the second sheet 112, 114 may be welded together so as to close the last of the sides of the bag 100 still open and thus seal the bag 100. In the first exemplary embodiment (FIG. 5a), the first and the second sheet 112, 114 are welded together so as to form the first edge 117 of the bag 100. If needed, welding S19 of the first and second sheets 112, 114 may further weld the tape 136 to itself at the ends 132, 134 of the channel 130 or weld the tape 136 to the first edge 117 of the bag 100 without fixing it to the second sheet 114 (for the bag 100 of FIG. 3c). In the second exemplary embodiment (FIGS. 5b to 5d), the first and the second sheet 112, 114 are welded together so as to form the mouth 119 of the bag 100.

[0144] This produces a bag 100 comprising one or two tapes 136, 146 at least partly protruding from the channel(s) 130, 140 so as to enable multiple opening and closing. The bag 100 is further filled and sealed.

[0145] Form-Fill-Seal Machine 200, 300 According to the First Embodiment

[0146] The bags 100 according to the first embodiment may be obtained by means of a form-fill-seal machine 200, 300 comprising: [0147] a device 210, 310 configured to guide a film 1 on the form-fill-seal machine 200, 300, [0148] a conveying device 215, 315 configured to guide a tape 136 on the film 1 (see FIGS. 5a and 5b) perpendicularly to a travel direction of the film 1. In a variant corresponding to the second embodiment, the conveying device 315 is further configured to guide a second tape 146 on the film 1 (see FIGS. 5c and 5d), perpendicularly to the travel direction of the film 1 such that the first and the second tape 136, 146 extend substantially parallel relative to each other. The conveying device 315 may also be configured to position the first and second tapes 136, 146 offset relative to each other in the travel direction of the film 1 and in the direction perpendicular to the travel direction of the film 1, [0149] a device 225, 325 configured to form the channel 130 or the first channel 130 and the second channel 140 on the film 1, especially to apply a strip 139 or strips 139, 149 intended to form the channel 130 or the channels 130, 140 to the film 1, above the tape 136 or the tapes 136, 146, such that the channel 130 or the channels 130, 140 extend perpendicularly to the travel direction of the film 1, [0150] welding bars 230, 330 configured to weld the channel 130 or the first channel 130 and the second channel 140 on the film 1, especially to weld the strip 139 or the strips 139, 149 attached on the film 1, above the tape 136 or the tapes 136, 146, [0151] a folding device 240, 340 to fold back the film 1 on itself, along a folding line extending in the travel direction of the film 1, so as to form the first 112 and the second 114 sheet. In particular in the second exemplary embodiment illustrated in FIGS. 5b to 5d, the folding device 340 comprises a former, [0152] first and second welding jaws 245a, 245b; 345a, 345b configured to weld the first sheet 112 on the second sheet 114 and respectively form the first and second edges 117, 118 (FIG. 5a) or the first edge 117 and the bottom 116 (FIGS. 5b to 5d), [0153] a filling chute 250, 350 configured to fill the bag 100 by the side still open, and [0154] third welding jaws 255, 355 configured to seal the bag 100 by closing the side still open.

[0155] In the case of the method illustrated in FIG. 5a, the first and second welding jaws 245a, 245b may be combined and configured to weld successively the bottom 116 and the mouth 119 of the bag 100 due to travel of the bag 100 in the machine 200.

[0156] In the case of the method illustrated in FIGS. 5b to 5d, the second and third welding jaws 345b, 355 may be combined and configured to weld successively the bottom 116 and the mouth 119 of the bag 100 due to travel of the bag 100 in the machine 300.

[0157] Optionally, the form-fill-seal machine 200, 300 may comprise fourth welding jaws 235, 335 configured to weld the tape 136 to the channel 130 or the first tape 136 to the first channel 130 and the second tape 146 to the second channel 140.

[0158] In the case of the method illustrated in FIG. 5a, the fourth welding jaws 235 may be combined with the third welding jaws 255 and configured to weld the tape 136 on the first sheet 112 at the first edge 117 of the bag 100, without welding the tape 136 on the second sheet 114. This especially produces a bag 100 as illustrated in FIG. 3c.

[0159] In the case of the method illustrated in FIG. 5b, the fourth welding jaws 335 may be combined with the first welding jaws 345a and configured to weld the tape 136 on the first sheet 112 at the first edge 117 of the bag 100, without welding the tape 136 on the second sheet 114. This especially produces a bag 100 as illustrated in FIG. 3c.

[0160] As a variant of the method illustrated in FIG. 5d, when the first and second tapes 136, 146 are intended to project from the second edge 118 of the bag 100, the fourth welding jaws 335 and the first welding jaws 345a may be combined so as to weld simultaneously the first and the second tape 136, 146 and the first edge 117. This especially produces a bag 100 as illustrated in FIG. 3e.

[0161] Optionally, and especially when the tape(s) 136, 146 are formed from heat-sealing material, the form-fill-seal machine 200, 300 may further comprise a device 220, 320 configured to form one of the notches 137, 147 (or clearances) on the film 1, in the zone of the film 1 intended to receive the ends 132, 134 of the channel 130 or the first end 132 of the first channel 130 and the second end 144 of the second channel 140. The device 220, 320 is preferably positioned between the device 210, 310 configured to guide the film 1 and the device 215, 315 configured to guide the tape(s) 136, 146.

[0162] The aim of these notches 137, 147 is to prevent welding of the tapes 136, 146 on the film 1, or even their cutting by the third or the first welding jaws 255, 345a during step S19 or S17 for welding the first and second sheets 112, 114 of the bag 100 so as to form the first edge 117 of the bag 100. Making the notch(es) 137, 147 in the film 1 in fact removes material at the ends 132, 134, 144 having to stay free of the channel(s) 130, 140 such that during welding of the first and second sheets 112, 114 of the bag 100 by the third welding jaws 255 or by the first welding jaws 345a, the effect of heat applied by the jaws 255, 345a is not to locally melt the film 1 and weld, or even cut, the end(s) 132, 134, 144 of the tape(s) 136, 146, ensuring that the tape(s) 136, 146 remain free of movement at these ends 132, 134, 144.

[0163] When the machine 200, 300 comprises a device 220, 320 configured to form a notch 137, 147 on the film 1 and the aim is for the tape 136 to protrude from the ends 132, 134 of the channel 130, the welding jaws 345a, 255 configured to weld the first edge 117 of the bag 100 may further have, in a welding face, notching configured to be opposite the notch 137, 147. It is evident in fact that when the tape 136 is formed from heat-sealable material, it is preferable to prevent its parts protruding from the channel 130 at the notch 137 not being cut by the welding jaws 345a, 255, when the latter weld the first sheet 112 onto the second sheet 114. By contrast, when the tape 136 is welded to itself, it is preferable to use conventional welding jaws 345a, 255 so as to simultaneously perform welding (step S17 or S19) of the first and of the second sheets 112, 114 and welding of the tape 136 to itself.

Second Embodiment

Longitudinal Fastening of the Closing Device 120

[0164] FIGS. 6 to 8 illustrate several examples of a tape bag 100, a method S20 for manufacturing and filling a tape bag 100, and a form-fill-seal machine 400, 500 according to a second embodiment of the invention.

[0165] Examples of Tape Bag 100 According to the Second Embodiment

[0166] FIGS. 6a to 6d illustrate examples of tape bags 100 obtained according to a method S20 for manufacturing and filling a tape bag 100 according to a second embodiment of the invention.

[0167] Only those characteristics of the bag 100 which differ from the first embodiment of the invention will be detailed hereinbelow.

[0168] The bag 100 comprises a closing device 120 comprising: [0169] a first channel 130 and a second channel 140 extending between the edges 117, 118 of the bag, respectively on the first and the second sheets 112, 114, the first channel 130 and the second channel 140 each comprising a first end 132, 142 and a second end 134, 144, and [0170] a first tape 136, housed in the first channel 130, and a second tape 146, housed in the second channel 140, the first tape 136 protruding from the first end 132 of the first channel 130 and the second tape 146 protruding from the second end 144 of the second channel 140.

[0171] In the examples illustrated in FIGS. 6a to 6c, the first tape 136 is welded to the first channel 130 and the second tape 146 is welded to the second channel 140. It is clear that welding the tapes 136, 146 to their respective channel 130, 140 blocks the tapes 136, 146 in the channels 130, 140 without needing to form a knot at their free end.

[0172] In the examples illustrated in FIGS. 6a and 6b, the first tape 130 is welded in a zone adjacent to the second end 134 of the first channel 130 and the second tape 146 is welded in a zone adjacent to the first end 142 of the second channel 140. The tapes 136, 146 may be welded either directly at the free ends 132, 144 respectively, or at a short distance from these free ends 132, 144.

[0173] The first end 132 of the first channel 130 and the first end 142 of the second channel 140 may be adjacent to the first edge 117 of the bag 100, as illustrated in FIG. 6a. In this way, the first tape 136 and the second tape 146 protrude from their respective channel 130, 140 at an edge 117, 118 opposite the bag 100. Closing of the bag 100 is therefore done by pulling on the tapes 136, 146 in the extension of their respective channel 130, 140, in opposite directions. Those skilled in the art will understand that pulling on the emerging ends of each of the tapes 136, 146 easily achieves closing of the mouth 119.

[0174] The first end 132 of the first channel 130 and the second end 144 of the second channel 140 may also be adjacent to the first edge 117 of the bag 100, as illustrated in FIG. 6b. In this way, the first tape 136 and the second tape 146 protrude from their respective channel 130, 140 at the same edge 117 of the bag 100. Closing of the bag 100 is therefore done by pulling on the tapes 136, 146 in the extension of their respective channel 130, 140, in the same direction, by gripping the first edge 117 of the bag at which the tapes 136, 146 protrude.

[0175] In the example illustrated in FIG. 6c, the first tape 136 is welded to the channel 130 in a first zone 151 extending at a distance from the second end 134 of the first channel 130 and the second tape 146 is welded to the channel 140 in a second zone 152 extending at a distance from the first end 142 of the second channel 140. For example, the first zone 151 and the second zone 152 may extend in a central part of the first sheet 112 and of the second sheet 114, respectively. Also, the first zone 151 and the second zone 152 may be superposed, or be offset one relative to the other along the channels 130, 140.

[0176] In this exemplary embodiment, the first tape 136 also projects from the second end 134 of the first channel 103 whereas the second tape 146 also projects from the first end 142 of the second channel 140. Closing a bag 100 is therefore done by gripping the bag 100 in the first and the second zone 151, 152, at the fastening of the tapes 136, 146, and pulling on the free ends of the tapes 136, 146 (either simultaneously, at a first edge 117 of the bag 100 then at the second edge 118 of the bag 100). This closing is particularly easy to the extent where the distance to be covered by the edges 117, 118 to attain the closed configuration of the bag 100 is reduced (by half when the zones 151 and 152 are at the center of the channels 130, 140), which reduces both the time necessary for closing the bag 100 and the friction linked to folding of the sheets 112, 114. Opening may also be done either by pulling on the edges 117, 118 of the bag 100, or by holding the first 151 and the second 152 zone and by pulling on the first 117 then the second 118 edge of the bag 100. Here too, opening is simplified by separation of the channels 130, 140 into two parts by welding in the first 151 and the second zone 152.

[0177] In the examples illustrated in FIGS. 6a to 6c, the first channel 130 and the second channel 140 may be offset relative to each other according to the height of the bag 100, i.e., the second channel 140 may be closer to the mouth 119 of the bag 100 than the first channel 130, such that they are not superposed when the bag 100 is flattened. This offsetting of the first and second channels 130, 140, during closing of the bag 100 by pulling on the tapes 136, 146 in opposite directions, deforms the channels 130, 140 and therefore the mouth 119 by bringing the first channel 130 and the second channel 140 together. The consequence of this deformation is to accentuate folding of the sheets 112, 114 and therefore improve the sealing of the bag 100.

[0178] Alternatively, the first channel 130 and the second channel 140 may by contrast be superposed and not be offset relative to each other according to the height of the bag 100.

[0179] This in particular in the example of bag 100 is illustrated in FIG. 6d, wherein the bag 100 is further provided with notches 137, 147 (or clearances) made at the ends 132, 134, 142, 144 of the channels 130, 140, and the first and second tapes 136, 146 are welded to each other at each of the ends 132, 134, 142, 144 of the channels 130, 140. In this example, the length of the tapes 136, 146 corresponds overall to the length of their respective channel 130, 140.

[0180] Method S20 for Manufacturing and Filling Tape Bags 100 According to the Second Embodiment

[0181] The bags 100 according to the second embodiment may be obtained on a so-called horizontal 400 (FIG. 9a) or vertical 500 (FIG. 9b) machine according to a manufacturing and filling method S20 comprising the following steps.

[0182] During a first step S21, a film 1 intended to form the sheets 112, 114 of the bag 100 is guided on a form-fill-seal machine 400, 500.

[0183] During a second step S22, optional, notches 137, 147 may be formed on the film, in the zone of the film intended to receive the ends 132, 134, 142, 144 of the channels 130, 140.

[0184] During a third step S23, a first and a second tape 136, 146 are guided on the film 1, parallel to a travel direction of the film 1.

[0185] During a fourth step S24, the sides of the film 1 are folded back on themselves so as to form the first and second channels 130, 140, such that the channels 130, 140 extend parallel to the travel direction of the film 1. The sides of the film 1 are then welded to said film by ensuring one or two welding lines 131, 133; 141, 143 of the fold thus formed on the sheets 112, 114 to define between the welding lines 131, 133 and 141, 143 the channels 130, 140 (FIG. 8c).

[0186] As a variant, strips 139, 149 intended to form the first and second channels 130, 140 are attached and welded on the exterior (FIG. 8a) or on the interior (FIG. 8b) of the film 1, above the first and second tapes 136, 146, such that the channels 130, 140 extend parallel to the travel direction of the film 1.

[0187] During a fifth step S25, optional, the tapes 136, 146 may be welded to their respective channel 130, 140.

[0188] For this, the first tape 136 may for example be welded to a part of the first channel 130 intended to form the second end 134 of the first channel 130, and the second tape 146 may for example be welded to a part of the second channel 140 intended to form the first end 142 of the second channel 140. The parts intended to form the first end 132 of the first channel 130 and the first end 142 of the second channel 140 may be adjacent to the first edge 117 of the bag 100. As a variant, the parts intended to form the first end 132 of the first channel 130 and the second end 144 of the second channel 140 may be adjacent to the first edge 117 of the bag 100.

[0189] The first tape 136 may also be welded to the channel 130 in a first zone 151 extending at a distance from the second end 134 of the first channel 130 and the second tape 146 may be welded to the channel 140 in a second zone 152 extending at a distance from the first end 142 of the second channel 140.

[0190] As a variant, the first and the second tape 136, 146 may be left free to slide in their respective channel 130, 140.

[0191] During a sixth step S26, the film 1 provided with the first and second tapes 136, 146 is folded back on itself along a folding line extending in the travel direction of the film 1 so as to form the first and the second sheet 112, 114. The folding line defines the bottom 116 of the bag 100. In the second exemplary embodiment illustrated in FIG. 9b, wherein the form-fill-seal machine 500 is vertical, the film 1 is guided to a former to fold back the film 1 on itself.

[0192] At this stage, the bag 100 is open at three of these sides.

[0193] During a seventh step S27, the first and the second sheet 112, 114 are welded together, so as to close two of the three open sides of the bag 100.

[0194] In the first exemplary embodiment illustrated in FIG. 9a, the first and the second sheet 112, 114 are welded together in a direction perpendicular to the travel direction of the film 1 so as to form successively the first and the second edge 117, 118 of the bag 100 due to travel of the film. The welding of the first and second sheets 112, 114 together in fact simultaneously closes the second edge 118 of a given bag 100 and the first edge 117 of the bag 100 located downstream. At this stage of the method illustrated in FIG. 9a, the obtained bags 100 then have a bottom 116, a sealed first edge 117 and a sealed second edge 118, as well as an open mouth 119. The mouth 119 is further equipped with one or more tapes 136 housed in a channel 130, 140 and optionally welded to said channel 130, 140. In this first example, transversal welding of the first and second sheets 112, 114 so as to successively close the first and the second edge 117, 118 of the bag 100 may further weld the tapes 136, 146 together at the ends 132, 134, 142, 144 of the channels 130, 140 (see FIG. 6d). Transversal welding of the first and second sheets 112, 114 so as to close the first and the second edge 117, 118 of the bag 100 may further weld the second tape 146 to the second channel 140 and the first tape 136 to the first channel 130 respectively at the first and second edges 117, 118 (see FIG. 6a).

[0195] In the second exemplary embodiment illustrated in FIG. 9b, the first and the second sheet 112, 114 are welded successively together along a longitudinal welding closing the mouth 119 of the bag 100 in a direction parallel to the travel direction of the film, then along transverse welding closing the first edge 117 of the bag 100 in a direction perpendicular to the direction of the film 1. Transverse welding of the first edge 117 of the bag 100 further seals, due to travel of the film 1, the second edge 118 of the bag 100 located downstream. At this stage of the method illustrated in FIG. 9b, the obtained bags 100 thus have a bottom 116 formed by the fold of the bag 100, a sealed first edge 117 and a sealed mouth 119, as well as an open second edge 118. The mouth 119 is further equipped with one or more tapes 136 housed in a channel 130, 140 and optionally welded to said channel 130, 140.

[0196] In this second example, transversal welding of the first and second sheets 112, 114 so as to close the first edge 117 of the bag 100 may further weld the tapes 136, 146 together at the ends 132, 142 of the channels 130, 140 adjacent to the first edge 117 (see FIG. 6d). Transversal welding of the first and second sheets 112, 114 so as to close the first edge 117 of the bag 100 may further weld the second tape 146 to the second channel 140 at the first edge 117 (see FIG. 6a).

[0197] In the first and second exemplary embodiments (FIG. 9a, FIG. 9b), the tapes 136, 146 are not cut during the seventh step S27. In this way, when the bag 100 detaches from the film 1, the tapes 136, 146 housed in their respective channel 130, 140 protrude from the edges 117, 118 of the bag 100 and remain housed in the channels 130, 140 formed on the film 1 for the downstream bag 100.

[0198] The sixth and seventh steps S26, S27 thus form the bag 100 in this way.

[0199] During an eighth step S28, the bag 100 is filled via the last of the sides of the bag 100 still open. In the first exemplary embodiment (FIG. 9a), the bag 100 is filled via the side intended to form the mouth 119 of the bag 100, whereas in the second exemplary embodiment (see FIG. 9b), the bag 100 is filled via the side intended to form the second edge 118 of the bag 100.

[0200] During a ninth step S29, the first and the second sheet 112, 114 are welded together so as to close the last of the sides of the bag 100 still open and thereby seal the bag 100.

[0201] In the first exemplary embodiment (see FIG. 9a), the first and the second sheet 112, 114 are welded together so as to form the mouth 119 of the bag 100 according to a longitudinal welding, whereas in the second exemplary embodiment (see FIG. 9b), the first and the second sheet 112, 114 are welded together so as to form the second edge 118 of the bag 100 according to a transverse welding. In this last case, during the ninth step S9 the tapes 136, 146 may be cut and welded to each other at the ends 134, 144 of the channels 130, 140 adjacent to the second edge 118 (see FIG. 6d). Transversal welding of the first and second sheets 112, 114 so as to close the second edge 118 of the bag 100 may further weld the first tape 136 to the first channel 130 at the second edge 118 (see FIG. 6a).

[0202] During a tenth step S30, optional, the first and the second tape 136, 146 are cut such that the free ends of the tapes 136, 146 protrude from the edge(s) 117, 118 of the bag 100 (FIGS. 6a to 6c). The tapes 136, 146 are for example cut hot, when the tapes 136, 146 are made of heat-sealing material.

[0203] As a variant, the tenth step S30 may occur after the filling step S28 of the bag 100 and before the sealing step S29 of the bag 100.

[0204] Form-Fill-Seal Machine 400, 500 According to the Second Embodiment

[0205] The bags 100 may be obtained by means of a form-fill-seal machine 400, 500 comprising: [0206] a device 410, 510 configured to guide a film 1 on the form-fill-seal machine 400, 500, [0207] a conveying device 415, 515 configured to guide a first and a second tape 136, 146 on the film 1, parallel to a travel direction of the film 1, such that the first tape 136 is adjacent to a first side of the film 1 and the second tape 146 is adjacent to a second side of the film 1, [0208] a device 425, 525 configured to form the first channel 130 and the second channel 140 on the film 1. The device 425, 525 is for example configured to fold back on themselves the sides of the film 1 so as to form the first and second channels 130, 140, such that the channels 130, 140 extend parallel to the travel direction of the film 1. The device 425, 525 may also be configured to apply strips 139, 149 intended to form the channels 130, 140 on the exterior or on the interior of the film 1, above the tapes 136, 146, such that the channels 130, 140 extend parallel to the travel direction of the film 1, [0209] welding bars 430, 530 configured to weld the first channel 130 and the second channel 140 on the film 1, especially to weld the folded-back sides of the film 1 or the strips 139, 149 attached on the film 1 above the tapes 136, 146, [0210] a folding device 440, 540 to fold back the film 1 on itself, along a folding line extending in the travel direction of the film 1 so as to form the first 112 and the second 114 sheets. In particular, in the second exemplary embodiment illustrated in FIG. 9b, the folding device 540 comprises a former, [0211] first and second welding jaws 445a, 445b; 545a, 545b configured to weld the first sheet 112 on the second sheet 114 and respectively form the first and the second edge 117, 118 (FIG. 9a) or the mouth 119 and the second edge 118 (FIG. 9b), [0212] a filling chute 450, 550 configured to fill the bag 100 by the side still open, and [0213] third welding jaws 455, 555 configured to seal the bag 100 by closing the side still open.

[0214] In the case of the method illustrated in FIG. 9a, the first and second welding jaws 445a, 445b may be combined and configured to weld successively the first and the second edge 117, 118 of the bag 100 due to travel of the bag 100 in the machine 200.

[0215] In the case of the method illustrated in FIG. 9b, the second and the third welding jaws 545b, 555 may be combined and configured to weld successively the second edge 118 and the first edge 117 of the bag 100 due to travel of the bag 100 in the machine 200.

[0216] Optionally, the form-fill-seal machine 400, 500 may comprise fourth welding jaws 435, 535 configured to weld the first tape 136 to the first channel 130 and the second tape 146 to the second channel 140.

[0217] In the case of the method illustrated in FIG. 9a, the fourth welding jaws 435 may be combined with the first and second welding jaws 445a and 445b.

[0218] In the case of the method illustrated in FIG. 9b, the fourth welding jaws 535 may be combined with the second and the third welding jaws 545b, 555.

[0219] Optionally, the form-fill-seal machine 400, 500 may further comprise a device 420, 520 configured to form one or more notches 137, 147 (or clearances) on the film 1, in the zone of the film 1 intended to receive the first end 132 of the first channel 130 and the second end 144 of the second channel 140. The device 420, 520 is then preferably positioned between the device 410, 510 configured to guide the film 1 and the device 415, 515 configured to guide the tape(s) 136, 146.

[0220] Similarly to the first embodiment, the object of the notches 137, 147 is to prevent welding or cutting of the tapes 136, 146 on the film 1, during welding steps S27 and/or S29. Similarly, when the machine 400, 500 comprises a device 420, 520 configured to form notches 137, 147 on the film 1 and when one wishes the tapes 136, 146 to protrude from the ends 132, 144 or 132, 134, 142, 144 of their respective channel 130, 140, the first and/or second welding jaws 445a, 445b or even the third welding jaws 555 may further have, in a welding face, notching configured to be opposite the notches 137, 147.

[0221] Optionally, the form-fill-seal machine 400, 500 may comprise a cutting device 460, 560 configured to cut the first and/or the second tape 136, 146.