EP0792801A1 - Automatic machine and method for forming, filling and closing packaging bags - Google Patents

Automatic machine and method for forming, filling and closing packaging bags Download PDF

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Publication number
EP0792801A1
EP0792801A1 EP97400407A EP97400407A EP0792801A1 EP 0792801 A1 EP0792801 A1 EP 0792801A1 EP 97400407 A EP97400407 A EP 97400407A EP 97400407 A EP97400407 A EP 97400407A EP 0792801 A1 EP0792801 A1 EP 0792801A1
Authority
EP
European Patent Office
Prior art keywords
film
machine according
fold
profiles
strip
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
EP97400407A
Other languages
German (de)
French (fr)
Other versions
EP0792801B1 (en
Inventor
Henri Bois
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.)
Flexico France SARL
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Flexico France SARL
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Filing date
Publication date
Application filed by Flexico France SARL filed Critical Flexico France SARL
Publication of EP0792801A1 publication Critical patent/EP0792801A1/en
Application granted granted Critical
Publication of EP0792801B1 publication Critical patent/EP0792801B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/207—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web advancing continuously
    • 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
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/12—Feeding webs from rolls
    • B65B41/16—Feeding webs from rolls by rollers
    • 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
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/18—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements
    • B65B61/188—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements by applying or incorporating profile-strips, e.g. for reclosable bags
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/2042—Means for altering the cross-section of the tube filling opening prior to transversal sealing, e.g. tube spreading devices
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/213—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web having intermittent motion
    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8131—Making bags having interengaging closure elements

Definitions

  • the present invention relates to the field of machines for forming, filling and automatically closing film-based packaging, in particular of thermoplastic material, comprising closure profiles, for example complementary male and female closure profiles.
  • Such machines are often called FFS, corresponding to the initials of the English expression "Form, Fill and Seal machine”.
  • Most of these machines include a forming neck which receives the film in the planar state from an unwinder and provides the film-shaped tube as output, a filling chute which opens into this forming neck and by Consequently in said tube, longitudinal welding means for closing the tube longitudinally and means capable of sequentially generating a first transverse weld before a product is introduced into the tube by the filler neck, then a second transverse weld when the product has been introduced into the tube, to close a package around the latter.
  • the present invention now aims to improve the machines thus known.
  • a machine for forming, filling and automatically closing packaging bags comprising means capable of generating at least one fold on the film intended to constitute a bag, to form at least one bellows on the final bag.
  • the aforementioned fold can be longitudinal, that is to say parallel to the direction of film travel, or transverse, that is to say perpendicular to this direction of travel of the film.
  • the machine further comprises means capable of defining step by step areas for fixing a fold mentioned above in places preferably corresponding to the transverse welds, before formation of the sachets.
  • two folds are provided, longitudinal or transverse, intended to form lateral bellows on the bag, transversely to the closure profiles.
  • the fold, longitudinal or transverse is produced in the form of a Z-fold in the body of the film.
  • the longitudinal or transverse fold is produced by adding a folded strip corresponding, for example, to the desired bottom gusset, on a film.
  • the present invention also relates to a method for manufacturing packaging bags on a machine for forming, filling and automatically closing packaging bags, which method comprises the step of generating at least one fold on the film intended to constitute a sachet, to form at least one bellows on the final sachet.
  • the method further comprises the step of defining step by step attachment zones of the above fold in places preferably corresponding to the transverse welds, before formation of the sachets.
  • the step of generating the fold consists in producing a Z-fold in the body of the film.
  • the step of generating the fold consists in making the fold by adding a strip folded longitudinally and corresponding for example to the desired bottom gusset, on a film.
  • the bag comprises a bottom bellows.
  • the invention is not limited to this provision.
  • the invention can be applied to the production of bags comprising two lateral bellows.
  • the fold produced on the film is a longitudinal fold, that is to say parallel to the direction of movement of the film. Then, other variants will be described according to which the fold is produced transversely on the film.
  • a packaging bag 10 formed using a film 12. It is preferably a film thermoplastic. However, the invention can extend to any flexible film capable of constituting a packaging sachet.
  • the bag 10 comprises a closure assembly 20 formed by two complementary closure profiles 22 and 24, respectively male and female, fixed on the internal surface of the bag 10, at the mouth 11 of the latter.
  • the sections 22 and 24 extend, in longitudinal direction according to the first embodiments, on the film 12 during the process of manufacturing the bag. The latter is closed transversely (that is to say perpendicular to the sections 22, 24) by welds 30.
  • the bag 10 is provided with a bellows 40 on its bottom opposite to the mouth 11.
  • the bellows 40 is composed of two facets 42, 44 which form a dihedral internal to the bag, concave towards the outside.
  • Profiles 22 and 24 can take many configurations. They can for example have come from molding with the film 12, or be attached to it. For this, the profiles 22 and 24 can be carried by respective bands 23, 25 as illustrated in particular in FIGS. 3 and 4 or carried by a single band 28 folded in a U as illustrated in particular in FIG. 1.
  • These strips 23, 25, 28 can be fixed to the internal surface of the film 12 (or even external for the strip 28) by any suitable means, preferably by welding.
  • the closure assembly 20 can be provided with a longitudinal cord 26 facilitating the opening of the bag.
  • the bag 10 can be closed longitudinally by the strip 28 supporting the profiles 22 and 24 as illustrated in FIG. 1 or by a longitudinal weld 14 as illustrated for example in FIGS. 3 and 4.
  • This longitudinal weld 14 can be formed in different places of the bag 10, for example over the width of the side walls 15, 16, in the body of the bag 10, as illustrated in FIGS. 3 and 4 or at the junction zone of a side wall 16 and the bottom bellows 40 as illustrated in FIGS. 5 and 6.
  • the overlap of the two edges of the film 12, at the level of the longitudinal weld 14 may itself be an overlap on the right or on the left, as illustrated in FIGS. 3, 4 and 3a, 4a.
  • the film 12 can be a single flexible single-layer film as illustrated in FIG. 1 or a complex film composed of different adjacent layers, for example coextruded, as illustrated in FIG. 2.
  • the U-shaped band 28 supporting the profiles 22 and 24 is welded to half its width, on the edges 18, 19 of the film 12.
  • a first external fabric 29 is thus formed, passing through the web of the U-shaped band 28, and a second inner fabric 30 passing through the sections 22 and 24.
  • This effect can be reinforced, and even guaranteed, if, as illustrated in FIG. 7, the second inner fabric 30 which carries the profiles 22 and 24 is of longer dimensions than the outer fabric 29.
  • FIGS. 7 and 8 Illustrated in FIGS. 7 and 8, a variant according to which the U-shaped band 28 is fixed to the inner surface of the edges 18, 19 of the film 12.
  • the U-shaped band 28 can be fixed on the outer surface of these edges 18, 19 of the film 12.
  • the U-shaped band 28 is fixed to the edges 18, 19 of the film 12, at the level of zones of the band 28 comprised between the sections 22, 24 and the center of the band. 28, provided for example with the opening cord 26.
  • this strip 28 it is possible to fix this strip 28 in a U shape, on the edges 18, 19 of the film 12, at the level of zones of the strip 28 located between the profiles 22, 24 and the longitudinal free edges of the U-shaped band 28.
  • the strip 28 is fixed by its longitudinal edges on the outer surface of the edges 18, 19 of the film 12.
  • the strip 28 could be fixed, by its longitudinal edges, on the internal surface of the edges 18, 19 of the film 12.
  • the loop closure assembly thus formed can be welded in height, on an edge of the film 12, like a fold.
  • the machine 100 includes means 118 capable of defining step by step fixing zones 13 of the aforementioned fold in places corresponding to the transverse welds (carried out subsequently), before formation of the sachets. .
  • These fixing means 118 are preferably provided at the part 104 or the part of the machine 100 located immediately downstream.
  • these means can be designed to fix the fold, by static discharge, partial gluing or any other equivalent fixing means.
  • the above-mentioned fixing means 118 are preferably adjustable over the length of the film 12 to allow precise adjustment thereof with respect to the zones corresponding subsequently to the transverse welds.
  • This fixing thus constitutes an essential characteristic of the present invention. It should also be noted that this attachment being located at the place of the transverse welds, said attachment 13 does not in any way disturb the production. subsequent of the sachet.
  • this fixing 13 step by step of the fold P makes it possible to facilitate the production of the transverse welds taking into account the extra thickness at this level resulting from the fold intended to form the bellows.
  • the film 12 provided with the fold P is then conveyed in a manner known per se to the FFS machine proper comprising a forming neck 120, a filling chute 130, longitudinal welding means 135 and transverse welding means 140.
  • the fixing means 118 make it possible to fix two of the walls of the fold P in the case of a complex film 12 and three parts in the case of a simple film 12.
  • the final fold P is preferably formed during the gripping of the film 12, on the one hand on the side of the profiles 22, 24, on the other hand on the side of the fold P, by a set of pneumatic, hydraulic, electromagnetic or mechanical 150 which pinch and stretch the film 12 at the time of the transverse welding.
  • Such clamps 150 are therefore controlled sequentially upon opening and closing on the one hand to grip the film and in lateral displacement to ensure a certain tension of the film 12 and to avoid any stray folds on the other hand.
  • FIG. 15 Such a clamp system is shown diagrammatically in FIG. 15.
  • the fold P can be positioned on one side or the other of the axis of the tube 130, with respect to the longitudinal weld 14.
  • the present invention makes it possible to produce, with the same filling tube 130 and the same training neck 120, the cost of which is high in an FFS machine, depths of fold P, and therefore of bellows 40, different simply in modifying the covering surface of the plates 112, 114 making up the conformation baffle 110.
  • the P fold can be finalized by forcing in the conditioning tube 130.
  • Such a window 132 and the corresponding training technique are notably illustrated in FIGS. 22 to 25.
  • the bellows 40 is formed by Z-folding of the film 12.
  • the bellows 40 can be produced by adding a strip 50 of film at the level of the formation neck 120.
  • This strip 50 is fixed to the film 12 by any conventional technique , preferably by welding.
  • This technique allows, on a complex or simple film 12 provided with a closure assembly 20 before the neck 120 passes, to add a strip 50 of complex or simple film which, by longitudinal welding, forms the bottom gusset 40.
  • transverse weld 30 can be straight or curved to facilitate self-maintenance of the bag in the vertical position after deployment of the bellows 40. More specifically in this case the transverse welds 30 produced on the two sides of the bag are symmetrical. To produce such curved transverse welds 30, it suffices to conform the transverse welding jaws 140 accordingly.
  • the strip 50 intended to form the bellows 40 can be folded beforehand or folded on the conditioner. It is also prefixed step by step at the areas 13 corresponding to the transverse welds 30, as indicated above.
  • the dimension of the final bellows 40 depends on the width of the strip 50 used.
  • the film 12 can be provided with the closure assembly 20 before the ply P is produced (the closure assembly 20 being originally linked to the film 12 or attached to it) or even be provided of this closure assembly immediately upstream of the training neck 120.
  • the advance of the film 12 can be timed and synchronized with the operation of the welding jaws 135, 140, or continuous.
  • the transverse welds 30 can be produced either to ensure a connection between the two walls 42 and 44 of the bottom bellows at the level of the transverse welds 30, or to avoid such a connection.
  • the bag 10 comprises two longitudinal bellows 40a, 40b, parallel to the closure profiles 20. More specifically, according to Figure 26 the two bellows 40a, 40b, are equidistant of the closure assembly 20. However, this equi-distance is not absolutely required.
  • FIG. 27 also shows an alternative embodiment of bags comprising two lateral bellows 40a, 40b, extending perpendicular to the closure assembly 20.
  • These lateral bellows 40a, 40b are also obtained using folds longitudinal produced on the film before the latter reaches the forming neck, or by adding suitable strips 50 to the film, as described above.
  • means are provided for depositing the closure assembly 20 on the film 12 transversely to the direction. movement of the film.
  • Such means of conveying the closure assembly 20 in a transverse direction may conform, for example, to the means described in documents US-A-4617683, US-A-4655862, US-A-4666536, US-A- 4701361, US-A-4709398, US-A-4878987, US-A-4844759, US-A-4929225, US-A-4909017 and US-A-5111643.
  • the closure assembly 20 is adjacent to one of the transverse welds 32, in order to guarantee the tightness of the bags despite the presence of the lateral bellows 40a, 40b.
  • the fold 40 intended to form the bellows can be a transverse fold, that is to say perpendicular to the direction of movement of the film 12.
  • the fold 40 in the form of a transverse z-fold in the body of the film 12.
  • the transverse fold 40 is produced using a strip 50 folded longitudinally in a U on itself, attached to the film 12.
  • FIG. 28 there is shown diagrammatically in FIG. 28 such a U-shaped strip 50, convexity directed towards the rear with respect to the direction of movement of the film 12, connected (coming from material) initially to the support strips 23, 25 of the profiles 22, 24.
  • the strip 50 connected to the profiles 22, 24, deposited on the film 12, has a length equal to half the width of the film 12.
  • One side of the U-shaped strip and the adjacent support strip 23 are welded to the film 12 at the level of the deposition station, upstream of the forming neck 120.
  • the other side of the U-shaped strip and the second support strip 25 are welded to the internal wall of the film 12 constituting the packaging after folding of this film in tubular configuration and filling of the packaging, that is to say during the finishing of this packaging, at the transverse welding station 140.
  • Such a strip 50 linked to the sections 22, 24 can be conveyed transversely on the film 12 by means known for this purpose as described in the aforementioned documents.
  • the transverse welding station 140 means capable of cutting this strip in order to separate the strip 50 in the actual U, intended to form a bellows, and the profiles 22, 24, along the cutting line. referenced 200 in Figure 28.
  • the profiles 22, 24 are linked to the mouth area of a sachet which has just been individualized, while the strip 50 in U forms a bellows of background for the sachet being formed.
  • such a U-shaped transverse strip 50 deposited on the film 12 can be separated from the origin of the transverse closing profiles 22, 24. This avoids the operation of subsequently cutting this strip as described for FIG. 28. However, it remains necessary to cut the bags in a manner known per se, along the line 202, between the closure profiles 22, 24 and the strip 50.
  • the transverse welding operation of this strip 50 on the film 12 can be adapted either to fix the ends of the fold together, at the internal surfaces of the fold, in a manner comparable to FIG. 27, that is to leave the internal surfaces of the fold free, in a manner comparable to FIG. 26.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Basic Packing Technique (AREA)

Abstract

The machine, designed to produce packages with interlocking closure strips, incorporates a mechanism (110) which makes a fold (P) in the film (12) to create at least one pleat in each finished package. The fold (P) can be made along or across the film layer, and the package closure strips can also be in either direction. The pleat in each package can be in the form of a Z-section fold in the film itself or a U-section insert welded into it. In the former case the fold can be made by two parallel plates (112, 114) with an adjustable amount of overlap.

Description

La présente invention concerne le domaine des machines de formation, remplissage et fermeture automatique d'emballages à base de film, notamment en matériau thermoplastique, comportant des profilés de fermeture, par exemple des profilés de fermeture mâle et femelle complémentaires.The present invention relates to the field of machines for forming, filling and automatically closing film-based packaging, in particular of thermoplastic material, comprising closure profiles, for example complementary male and female closure profiles.

De telles machines sont souvent dénommées FFS, correspondant aux initiales de l'expression anglaise "Form, Fill and Seal machine".Such machines are often called FFS, corresponding to the initials of the English expression "Form, Fill and Seal machine".

On a déjà proposé de nombreuses machines de ce type.Many machines of this type have already been proposed.

La plupart de ces machines comprennent un col de formage qui reçoit en entrée le film à l'état plan en provenance d'un dérouleur et fournit en sortie le film conformé en tube, une goulotte de remplissage qui débouche dans ce col de formage et par conséquent dans ledit tube, des moyens de soudure longitudinale pour fermer le tube longitudinalement et des moyens aptes à générer séquentiellement une première soudure transversale avant qu'un produit ne soit introduit dans le tube par la goulotte de remplissage, puis une seconde soudure transversale quand le produit a été introduit dans le tube, pour fermer un emballage autour de ce dernier.Most of these machines include a forming neck which receives the film in the planar state from an unwinder and provides the film-shaped tube as output, a filling chute which opens into this forming neck and by Consequently in said tube, longitudinal welding means for closing the tube longitudinally and means capable of sequentially generating a first transverse weld before a product is introduced into the tube by the filler neck, then a second transverse weld when the product has been introduced into the tube, to close a package around the latter.

La présente invention a maintenant pour but de perfectionner les machines ainsi connues.The present invention now aims to improve the machines thus known.

Il est proposé dans le cadre de la présente invention, une machine de formation, remplissage et fermeture automatique de sachets d'emballage comportant des moyens aptes à générer au moins un pli sur le film destiné à constituer un sachet, pour former au moins un soufflet sur le sachet final.It is proposed in the context of the present invention, a machine for forming, filling and automatically closing packaging bags comprising means capable of generating at least one fold on the film intended to constitute a bag, to form at least one bellows on the final bag.

Selon des variantes de mise en oeuvre, le pli précité peut être longitudinal, c'est-à-dire parallèle à la direction de défilement de film, ou transversal, c'est-à-dire perpendiculaire à cette direction de défilement du film.According to alternative embodiments, the aforementioned fold can be longitudinal, that is to say parallel to the direction of film travel, or transverse, that is to say perpendicular to this direction of travel of the film.

Selon une autre caractéristique avantageuse de l'invention, la machine comprend en outre des moyens aptes à définir pas à pas des zones de fixation d'un pli précité en des lieux correspondant de préférence aux soudures transversales, avant formation des sachets.According to another advantageous characteristic of the invention, the machine further comprises means capable of defining step by step areas for fixing a fold mentioned above in places preferably corresponding to the transverse welds, before formation of the sachets.

Selon un premier mode de réalisation, il est prévu au moins un pli, longitudinal ou transversal, destiné à former un soufflet dans le fond du sachet, auquel cas le pli est réalisé dans une région opposée à l'embouchure recevant l'ensemble de fermeture.According to a first embodiment, there is provided at least one fold, longitudinal or transverse, intended to form a bellows in the bottom of the bag, in which case the fold is produced in a region opposite to the mouth receiving the closure assembly .

Selon un deuxième mode de réaliation, il est prévu deux plis, longitudinaux ou transversaux, destinés à former des soufflets latéraux sur le sachet, transversalement aux profilés de fermeture.According to a second embodiment, two folds are provided, longitudinal or transverse, intended to form lateral bellows on the bag, transversely to the closure profiles.

Selon une première variante de réalisation de l'invention, le pli, longitudinal ou transversal, est réalisé sous forme d'un pli en Z dans le corps du film.According to a first alternative embodiment of the invention, the fold, longitudinal or transverse, is produced in the form of a Z-fold in the body of the film.

Selon une seconde variante de réalisation conforme à la présente invention, le pli longitudinal ou transversal, est réalisé par apport d'une bande pliée et correspondant par exemple au soufflet de fond recherché, sur un film.According to a second alternative embodiment in accordance with the present invention, the longitudinal or transverse fold, is produced by adding a folded strip corresponding, for example, to the desired bottom gusset, on a film.

La présente invention concerne également un procédé de fabrication de sachets d'emballage sur une machine de formation, remplissage et fermeture automatique de sachets d'emballage, lequel procédé comporte l'étape qui consiste à générer au moins un pli sur le film destiné à constituer un sachet, pour former au moins un soufflet sur le sachet final.The present invention also relates to a method for manufacturing packaging bags on a machine for forming, filling and automatically closing packaging bags, which method comprises the step of generating at least one fold on the film intended to constitute a sachet, to form at least one bellows on the final sachet.

Selon une autre caractéristique avantageuse de l'invention, le procédé comprend en outre l'étape consistant à définir pas à pas des zones de fixation du pli précité en des lieux correspondant de préférence aux soudures transversales, avant formation des sachets.According to another advantageous characteristic of the invention, the method further comprises the step of defining step by step attachment zones of the above fold in places preferably corresponding to the transverse welds, before formation of the sachets.

Selon une première variante du procédé de l'invention, l'étape de génération du pli consiste à réaliser un pli en Z dans le corps du film.According to a first variant of the method of the invention, the step of generating the fold consists in producing a Z-fold in the body of the film.

Selon une seconde variante du procédé conforme à la présente invention, l'étape de génération du pli consiste à réaliser le pli par apport d'une bande pliée longitudinalement et correspondant par exemple au soufflet de fond recherché, sur un film.According to a second variant of the method according to the present invention, the step of generating the fold consists in making the fold by adding a strip folded longitudinally and corresponding for example to the desired bottom gusset, on a film.

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre et en regard des dessins annexés donnés à titre d'exemples non limitatifs et sur lesquels :

  • la figure 1 représente une vue schématique en perspective et en coupe transversale d'un sachet d'emballage conforme à la présente invention, réalisé à l'aide d'un film simple,
  • la figure 2 représente une vue schématique en perspective et en coupe transversale d'un sachet d'emballage conforme à une autre variante de réalisation de la présente invention, réalisé à l'aide d'un film complexe,
  • les figures 3, 4, 5 et 6 représentent des vues en coupe transversale de sachet d'emballage conforme à d'autres variantes de l'invention, les figures 3bis et 4bis illustrant des détails de réalisation d'une soudure longitudinale,
  • la figure 7 représente une vue schématique en perspective et en coupe transversale d'un sachet d'emballage conforme à une autre variante de réalisation de la présente invention, obtenu à l'aide d'un ensemble de fermeture comportant une bande support en U,
  • la figure 8 représente une vue de détail de cet ensemble de fermeture, et les figures 8bis et 8ter représentent deux variantes de cet ensemble de fermeture,
  • la figure 9 représente une vue schématique latérale d'une machine de formation, remplissage et fermeture automatique conforme à la présente invention,
  • la figure 10 représente une vue de dessus de la même machine,
  • la figure 11 représente une vue de dessus et en détail, des moyens de soudure pas à pas d'un pli longitudinal, conformes à la présente invention,
  • la figure 12 représente une vue schématique en coupe verticale des moyens formant chicane utilisés pour la réalisation d'un pli longitudinal dans le cadre de la présente invention,
  • la figure 13 représente une vue schématique en coupe verticale d'un pli longitudinal conforme à l'invention,
  • la figure 14 illustre schématiquement le risque de glissement au niveau du pli longitudinal, auquel remédient des moyens conformes à la présente invention,
  • la figure 15 représente une vue schématique en coupe horizontale de moyens d'étirage conformes à la présente invention, avant réalisation des soudures transversales,
  • les figures 16 et 17 représentent des vues en coupe horizontale au niveau de la goulotte de remplissage d'une machine conforme à la présente invention et illustre la possibilité de réaliser des sachets ayant des profondeurs de soufflet différentes sur une même goulotte de remplissage,
  • les figures 18 et 19 représentent des vues schématiques en coupe transversale de deux variantes de réalisation de sachets d'emballage conformes à la présente invention présentant des profondeurs de soufflets différentes, réalisés par apport d'une bande pliée sur un film,
  • la figure 20 représente une vue schématique en perspective d'une variante de machine conforme à la présente invention opérant par apport d'une bande pliée pour réaliser le soufflet,
  • la figure 21 représente une vue de détail au niveau d'une soudure transversale,
  • la figure 22 représente schématiquement une vue latérale d'une goulotte de remplissage conforme à la présente invention,
  • les figures 23, 24 et 25 représentent trois vues en coupe horizontale de la même goulotte de remplissage selon des vues illustrées XXIII-XXIII, XXIV-XXIV et XXV-XXV sur la figure 22,
  • les figures 26 et 27 représentent deux variantes de réalisation de sachets à double soufflet, et
  • les figures 28 et 29 représentent deux variantes de profilés et bandes déposées transversalement sur un film pour former des soufflets de fond sur les sachets.
Other characteristics, aims and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings given by way of nonlimiting examples and in which:
  • Figure 1 shows a schematic perspective view in section transverse of a packaging bag in accordance with the present invention, produced using a simple film,
  • FIG. 2 represents a schematic perspective view and in cross section of a packaging sachet according to another alternative embodiment of the present invention, produced using a complex film,
  • FIGS. 3, 4, 5 and 6 show cross-sectional views of a packaging sachet in accordance with other variants of the invention, FIGS. 3bis and 4bis illustrating details of the production of a longitudinal weld,
  • FIG. 7 represents a schematic perspective view and in cross section of a packaging sachet according to another alternative embodiment of the present invention, obtained by means of a closure assembly comprising a U-shaped support strip,
  • FIG. 8 represents a detailed view of this closure assembly, and FIGS. 8bis and 8ter represent two variants of this closure assembly,
  • FIG. 9 represents a schematic side view of a machine for forming, filling and automatic closing according to the present invention,
  • FIG. 10 represents a top view of the same machine,
  • FIG. 11 represents a top view and in detail, step-by-step welding means of a longitudinal fold, in accordance with the present invention,
  • FIG. 12 represents a schematic view in vertical section of the means forming a baffle used for producing a longitudinal fold in the context of the present invention,
  • FIG. 13 represents a schematic view in vertical section of a longitudinal fold according to the invention,
  • FIG. 14 schematically illustrates the risk of slipping at the level of the longitudinal fold, which is remedied by means according to the present invention,
  • FIG. 15 represents a schematic view in horizontal section of drawing means in accordance with the present invention, before making the transverse welds,
  • Figures 16 and 17 show views in horizontal section at the level the filling spout of a machine according to the present invention and illustrates the possibility of producing sachets having different bellows depths on the same filling spout,
  • FIGS. 18 and 19 show schematic cross-sectional views of two alternative embodiments of packaging bags in accordance with the present invention having different bellows depths, produced by adding a folded strip on a film,
  • FIG. 20 represents a schematic perspective view of a variant machine in accordance with the present invention operating by adding a folded strip to produce the bellows,
  • FIG. 21 shows a detailed view at the level of a transverse weld,
  • FIG. 22 schematically represents a side view of a filling chute according to the present invention,
  • FIGS. 23, 24 and 25 represent three views in horizontal section of the same filling chute according to illustrated views XXIII-XXIII, XXIV-XXIV and XXV-XXV in FIG. 22,
  • FIGS. 26 and 27 show two alternative embodiments of bags with double bellows, and
  • Figures 28 and 29 show two variants of profiles and strips deposited transversely on a film to form bottom gussets on the bags.

Dans la suite de la description, on va tout d'abord, à des fins de simplification, décrire des variantes de mise en oeuvre selon lesquelles le sachet comprend un soufflet de fond. Cependant, comme on l'a évoqué précédemment, l'invention n'est pas limitée à cette disposition. En particulier, en variante, l'invention peut s'appliquer à la réalisation de sachets comprenant deux soufflets latéraux.In the following description, we will first of all, for simplification purposes, describe alternative embodiments according to which the bag comprises a bottom bellows. However, as mentioned above, the invention is not limited to this provision. In particular, as a variant, the invention can be applied to the production of bags comprising two lateral bellows.

En outre, on va décrire dans un premier temps des variantes de mise en oeuvre dans lesquelles le pli réalisé sur le film est un pli longitudinal, c'est-à-dire parallèle à la direction de déplacement du film. Puis, on décrira d'autres variantes selon lesquelles le pli est réalisé transversalement sur le film.In addition, we will first describe alternative embodiments in which the fold produced on the film is a longitudinal fold, that is to say parallel to the direction of movement of the film. Then, other variants will be described according to which the fold is produced transversely on the film.

On distingue sur les figures annexées, un sachet d'emballage 10 formé à l'aide d'un film 12. Il s'agit de préférence d'un film thermoplastique. Cependant, l'invention peut s'étendre à tout film souple susceptible de constituer un sachet d'emballage. Le sachet 10 comporte un ensemble de fermeture 20 formé de deux profilés de fermeture complémentaires 22 et 24, respectivement mâle et femelle, fixés sur la surface interne du sachet 10, au niveau de l'embouchure 11 de celui-ci. Les profilés 22 et 24 s'étendent, en direction longitudinale selon les premiers modes de réalisation, sur le film 12 au cours du processus de fabrication du sachet. Celui-ci est fermé transversalement (c'est-à-dire perpendiculairement aux profilés 22, 24) par des soudures 30.We can see in the attached figures, a packaging bag 10 formed using a film 12. It is preferably a film thermoplastic. However, the invention can extend to any flexible film capable of constituting a packaging sachet. The bag 10 comprises a closure assembly 20 formed by two complementary closure profiles 22 and 24, respectively male and female, fixed on the internal surface of the bag 10, at the mouth 11 of the latter. The sections 22 and 24 extend, in longitudinal direction according to the first embodiments, on the film 12 during the process of manufacturing the bag. The latter is closed transversely (that is to say perpendicular to the sections 22, 24) by welds 30.

Conformément aux premiers modes de réalisation de la présente invention, le sachet 10 est muni d'un soufflet 40 sur son fond opposé à l'embouchure 11.In accordance with the first embodiments of the present invention, the bag 10 is provided with a bellows 40 on its bottom opposite to the mouth 11.

Selon les figures, le soufflet 40 est composé de deux facettes 42, 44 qui forment un dièdre interne au sachet, concave vers l'extérieur.According to the figures, the bellows 40 is composed of two facets 42, 44 which form a dihedral internal to the bag, concave towards the outside.

Les profilés 22 et 24 peuvent prendre de nombreuses configurations. Ils peuvent par exemple être venus de moulage avec le film 12, ou être rapportés sur celui-ci. Pour celà les profilés 22 et 24 peuvent être portés par des bandes respectives 23, 25 comme illustré notamment sur les figures 3 et 4 ou portés par une bande unique 28 repliée en U comme illustré notamment sur la figure 1.Profiles 22 and 24 can take many configurations. They can for example have come from molding with the film 12, or be attached to it. For this, the profiles 22 and 24 can be carried by respective bands 23, 25 as illustrated in particular in FIGS. 3 and 4 or carried by a single band 28 folded in a U as illustrated in particular in FIG. 1.

Ces bandes 23, 25, 28 peuvent être fixées sur la surface interne du film 12 (voire externe pour la bande 28) par tous moyens appropriés, de préférence par soudure.These strips 23, 25, 28 can be fixed to the internal surface of the film 12 (or even external for the strip 28) by any suitable means, preferably by welding.

En outre comme on le voit notamment sur la figure 1, de façon connue en soi l'ensemble de fermeture 20 peut être muni d'un cordon longitudinal 26 facilitant l'ouverture du sachet.Furthermore, as can be seen in particular in FIG. 1, in a manner known per se, the closure assembly 20 can be provided with a longitudinal cord 26 facilitating the opening of the bag.

Le sachet 10 peut être fermé longitudinalement par la bande 28 support des profilés 22 et 24 comme illustré sur la figure 1 ou par une soudure longitudinale 14 comme illustré par exemple sur les figures 3 et 4.The bag 10 can be closed longitudinally by the strip 28 supporting the profiles 22 and 24 as illustrated in FIG. 1 or by a longitudinal weld 14 as illustrated for example in FIGS. 3 and 4.

Cette soudure longitudinale 14 peut être formée en différents lieux du sachet 10, par exemple sur la largeur des parois latérales 15, 16, dans le corps du sachet 10, comme illustré sur les figures 3 et 4 ou à la zone de jonction d'une paroi latérale 16 et du soufflet de fond 40 comme illustré sur les figures 5 et 6.This longitudinal weld 14 can be formed in different places of the bag 10, for example over the width of the side walls 15, 16, in the body of the bag 10, as illustrated in FIGS. 3 and 4 or at the junction zone of a side wall 16 and the bottom bellows 40 as illustrated in FIGS. 5 and 6.

Le recouvrement des deux bords du film 12, au niveau de la soudure longitudinale 14 peut lui même être un recouvrement à droite ou à gauche, comme illustré sur les figures 3, 4 et 3bis, 4bis.The overlap of the two edges of the film 12, at the level of the longitudinal weld 14 may itself be an overlap on the right or on the left, as illustrated in FIGS. 3, 4 and 3a, 4a.

Le film 12 peut être un film souple simple monocouche comme illustré sur la figure 1 ou un film complexe composé de différentes couches adjacentes, par exemple coextrudées, comme illustré sur la figure 2.The film 12 can be a single flexible single-layer film as illustrated in FIG. 1 or a complex film composed of different adjacent layers, for example coextruded, as illustrated in FIG. 2.

Selon une variante de réalisation préférentielle illustrée sur la figure 7 la bande 28 en U supportant les profilés 22 et 24 est soudée au moitié de sa largeur, sur les bords 18, 19 du film 12. Il est formé ainsi une première toile extérieure 29, passant par l'âme de la bande 28 en U, et une deuxième toile 30 intérieure passant par les profilés 22 et 24. Ainsi on évite que la pression interne au sachet ne sollicite les profilés 22 et 24 à l'ouverture du fait que le support des profilés n'est pas relié sur les bords 18, 19 du film 12, en regard des profilés 22, 24, mais en deçà des profilés. Cet effet, peut être renforcé, et même garanti, si, comme illustré sur le figure 7, la deuxième toile intérieure 30 qui porte les profilés 22 et 24 est de dimensions plus longues que la toile extérieure 29.According to a preferred variant of embodiment illustrated in FIG. 7, the U-shaped band 28 supporting the profiles 22 and 24 is welded to half its width, on the edges 18, 19 of the film 12. A first external fabric 29 is thus formed, passing through the web of the U-shaped band 28, and a second inner fabric 30 passing through the sections 22 and 24. This prevents the internal pressure in the bag from stressing the sections 22 and 24 upon opening because the support of the profiles is not connected to the edges 18, 19 of the film 12, opposite the profiles 22, 24, but below the profiles. This effect can be reinforced, and even guaranteed, if, as illustrated in FIG. 7, the second inner fabric 30 which carries the profiles 22 and 24 is of longer dimensions than the outer fabric 29.

On a illustré sur les figures 7 et 8, une variante selon laquelle la bande 28 en U est fixée sur la surface intérieure des bords 18, 19 du film 12. En variante, comme illustré sur la figure 8bis, la bande 28 en U peut être fixée sur la surface extérieure de ces bords 18, 19 du film 12.Illustrated in FIGS. 7 and 8, a variant according to which the U-shaped band 28 is fixed to the inner surface of the edges 18, 19 of the film 12. As a variant, as illustrated in FIG. 8a, the U-shaped band 28 can be fixed on the outer surface of these edges 18, 19 of the film 12.

Par ailleurs, selon les figures 7, 8 et 8bis, la bande 28 en U est fixée sur les bords 18, 19 du film 12, au niveau de zones de la bande 28 comprises entre les profilés 22, 24 et le centre de la bande 28, munie par exemple du cordon d'ouverture 26. Cependant, en variante, comme illustré sur la figure 8ter, on peut fixer cette bande 28 en U, sur les bords 18, 19 du film 12, au niveau de zones de la bande 28 situées entre les profilés 22, 24 et les bords libres longitudinaux de la bande 28 en U.Furthermore, according to FIGS. 7, 8 and 8a, the U-shaped band 28 is fixed to the edges 18, 19 of the film 12, at the level of zones of the band 28 comprised between the sections 22, 24 and the center of the band. 28, provided for example with the opening cord 26. However, as a variant, as illustrated in FIG. 8b, it is possible to fix this strip 28 in a U shape, on the edges 18, 19 of the film 12, at the level of zones of the strip 28 located between the profiles 22, 24 and the longitudinal free edges of the U-shaped band 28.

Plus précisément encore, selon la figure 8ter, la bande 28 est fixée par ses bords longitudinaux sur la surface extérieure des bords 18, 19 du film 12. Cependant, selon une autre variante, la bande 28 pourrait être fixée, par ses bords longitudinaux, sur la surface interne des bords 18, 19 du film 12.More precisely still, according to FIG. 8ter, the strip 28 is fixed by its longitudinal edges on the outer surface of the edges 18, 19 of the film 12. However, according to another variant, the strip 28 could be fixed, by its longitudinal edges, on the internal surface of the edges 18, 19 of the film 12.

Dans ce cas l'ensemble de fermeture en boucle ainsi formé peut être soudé dans la hauteur, sur un bord du film 12, comme un pli.In this case the loop closure assembly thus formed can be welded in height, on an edge of the film 12, like a fold.

On a illustré sur les figures 9 et 10, la structure générale d'une machine 100 conforme à la présente invention.Is illustrated in Figures 9 and 10, the general structure of a machine 100 according to the present invention.

On distingue sur ces figures une partie dérouleur 102 suivie d'une partie d'asservissement 104 munie d'un pantin 106 de hauteur variable. Le soufflet 40 est préparé au niveau de cette partie 104, grâce à une chicane 110 formée de deux plaques 112 et 114 superposées en recouvrement. Cette chicane 110 définit un pli P en Z, comme on le voit sur la figure 12.We distinguish in these figures an unwinder part 102 followed by a servo part 104 provided with a puppet 106 of variable height. The bellows 40 is prepared at this part 104, thanks to a baffle 110 formed by two plates 112 and 114 superimposed in overlap. This baffle 110 defines a fold P in Z, as seen in FIG. 12.

De plus comme indiqué précédemment, selon la présente invention, la machine 100 comporte des moyens 118 aptes à définir pas à pas des zones de fixation 13 du pli précité en des lieux correspondant aux soudures transversales (réalisées par la suite), avant formation des sachets.In addition, as indicated above, according to the present invention, the machine 100 includes means 118 capable of defining step by step fixing zones 13 of the aforementioned fold in places corresponding to the transverse welds (carried out subsequently), before formation of the sachets. .

Ces moyens de fixation 118 sont de préférence prévus au niveau de la partie 104 ou de la partie de la machine 100 située immédiatement en aval.These fixing means 118 are preferably provided at the part 104 or the part of the machine 100 located immediately downstream.

Ils peuvent faire l'objet de différents modes de réalisation. Selon une variante de réalisation préférentielle, ils sont conçus pour souder ponctuellement le pli P afin de tenir celui-ci. Cependant selon des variantes, ces moyens peuvent être conçus pour fixer le pli, par décharge statique, collage partiel ou tout autre moyen de fixation équivalent.They can be the subject of different embodiments. According to a preferred embodiment, they are designed to punctually weld the ply P in order to hold it. However, according to variants, these means can be designed to fix the fold, by static discharge, partial gluing or any other equivalent fixing means.

Les moyens de fixation 118 précités sont de préférence réglables sur la longueur du film 12 pour permettre de régler avec précision ceux-ci par rapport aux zones correspondant ultérieurement aux soudures transversales.The above-mentioned fixing means 118 are preferably adjustable over the length of the film 12 to allow precise adjustment thereof with respect to the zones corresponding subsequently to the transverse welds.

Bien entendu il convient également de synchroniser avec soin les instants de commande de ces moyens de fixation 118 avec le défilement du film 12, puisque les instants de commande de ces moyens de fixation 118 contrôlent à la fois, le lieu des zones de fixation 13 et le pas de ces zones.Of course, the instants for controlling these fixing means 118 should also be carefully synchronized with the movement of the film 12, since the instants for controlling these fixing means 118 control both the location of the fixing zones 13 and the pace of these areas.

La fixation 13 pas à pas du pli P comme indiqué précédemment, immédiatement après sa formation, permet de maintenir celui-ci tout au long de son cheminement. Cette fixation constitue ainsi une caractéristique essentielle de la présente invention. Il faut noter par ailleurs que cette fixation étant localisée sur le lieu des soudures transversales, ladite fixation 13 ne perturbe aucunement la réalisation ultérieure du sachet.The fixing 13 step by step of the fold P as indicated above, immediately after its formation, makes it possible to maintain it throughout its journey. This fixing thus constitutes an essential characteristic of the present invention. It should also be noted that this attachment being located at the place of the transverse welds, said attachment 13 does not in any way disturb the production. subsequent of the sachet.

En outre, cette fixation 13 pas à pas du pli P permet de faciliter la réalisation des soudures transversales compte-tenu de la surépaisseur à ce niveau résultant du pli destiné à former le soufflet.In addition, this fixing 13 step by step of the fold P makes it possible to facilitate the production of the transverse welds taking into account the extra thickness at this level resulting from the fold intended to form the bellows.

Le film 12 muni du pli P est ensuite acheminé de façon connue en soi vers la machine FFS proprement dite comprenant un col de formage 120, une goulotte de remplissage 130, des moyens de soudure longitudinale 135 et des moyens de soudure transversale 140.The film 12 provided with the fold P is then conveyed in a manner known per se to the FFS machine proper comprising a forming neck 120, a filling chute 130, longitudinal welding means 135 and transverse welding means 140.

Plus précisément dans le cadre de la présente invention, les moyens de fixation 118 permettent de fixer deux des parois du pli P dans le cas d'un film 12 complexe et trois parties dans le cas d'un film 12 simple.More specifically in the context of the present invention, the fixing means 118 make it possible to fix two of the walls of the fold P in the case of a complex film 12 and three parts in the case of a simple film 12.

Le pli P formé dès la sortie du dérouleur 102 de la machine est donc ensuite maintenu tout au long du déroulement. Dans le cas d'un film complexe, seulement deux parties du pli P étant généralement fixées, il existe un risque d'extension latérale, par glissement, de ce pli P, comme illustré sur la figure 14. Pour remédier à cette difficulté, il est prévu de préférence dans le cadre de la présente invention, un système de guidage des parois du film 12, par roulettes à axe de déroulement contrôlé et/ou tout autre système de guidage des bords du filmThe fold P formed from the outlet of the unwinder 102 from the machine is therefore then maintained throughout the unwinding. In the case of a complex film, only two parts of the P fold being generally fixed, there is a risk of lateral extension, by sliding, of this P fold, as illustrated in FIG. 14. To remedy this difficulty, it is preferably provided in the context of the present invention, a system for guiding the walls of the film 12, by rollers with a controlled unwinding axis and / or any other system for guiding the edges of the film.

Le pli définitif P est de préférence formé au cours de la saisie du film 12, d'une part du côté des profils 22, 24, d'autre part du côté du pli P, par un jeu de pinces pneumatiques, hydrauliques, électromagnétiques ou mécaniques 150 qui pincent et étirent le film 12 au moment de la soudure transversale.The final fold P is preferably formed during the gripping of the film 12, on the one hand on the side of the profiles 22, 24, on the other hand on the side of the fold P, by a set of pneumatic, hydraulic, electromagnetic or mechanical 150 which pinch and stretch the film 12 at the time of the transverse welding.

De telles pinces 150 sont par conséquent commandées séquentiellement à l'ouverture et à la fermeture d'une part pour saisir le film et en déplacement latéral pour assurer une certaine tension du film 12 et éviter tout pli parasite d'autre part.Such clamps 150 are therefore controlled sequentially upon opening and closing on the one hand to grip the film and in lateral displacement to ensure a certain tension of the film 12 and to avoid any stray folds on the other hand.

Un tel système de pince est schématisé sur la figure 15.Such a clamp system is shown diagrammatically in FIG. 15.

Le pli P peut être positionné d'un côté ou de l'autre de l'axe du tube 130, par rapport à la soudure longitudinale 14.The fold P can be positioned on one side or the other of the axis of the tube 130, with respect to the longitudinal weld 14.

Il convient de noter que la présente invention permet de réaliser avec un même tube de remplissage 130 et un même col de formation 120, dont le coût est important dans une machine FFS, des profondeurs de pli P, et donc de soufflet 40, différentes simplement en modifiant la surface de recouvremement des plaques 112, 114 composant la chicane de conformation 110.It should be noted that the present invention makes it possible to produce, with the same filling tube 130 and the same training neck 120, the cost of which is high in an FFS machine, depths of fold P, and therefore of bellows 40, different simply in modifying the covering surface of the plates 112, 114 making up the conformation baffle 110.

On a ainsi schématisé sur les figures 3 à 6, 16 et 17, des soufflets de profondeurs différentes.There are thus shown diagrammatically in FIGS. 3 to 6, 16 and 17, bellows of different depths.

Selon une autre variante, le pli P peut être finalisé par forçage dans le tube de conditionnement 130. Pour celà il suffit de fendre longitudinalement le col sous forme d'une fenêtre 132 d'entrée du pli P située à une hauteur adéquate (voir figure 22).According to another variant, the P fold can be finalized by forcing in the conditioning tube 130. For this it suffices to split the neck longitudinally in the form of a window 132 for entering the P fold located at an adequate height (see FIG. 22).

Une telle fenêtre 132 et la technique de formation correspondante sont notamment illustrées sur les figures 22 à 25.Such a window 132 and the corresponding training technique are notably illustrated in FIGS. 22 to 25.

Selon les modes de réalisation qui précèdent, le soufflet 40 est formé par pliage en Z du film 12.According to the above embodiments, the bellows 40 is formed by Z-folding of the film 12.

Cependant selon une variante illustrée sur les figures 2 et 18 à 21, le soufflet 40 peut être réalisé par apport d'une bande 50 de film au niveau du col de formation 120. Cette bande 50 est fixée sur le film 12 par toute technique classique, soit de préférence par soudure.However, according to a variant illustrated in FIGS. 2 and 18 to 21, the bellows 40 can be produced by adding a strip 50 of film at the level of the formation neck 120. This strip 50 is fixed to the film 12 by any conventional technique , preferably by welding.

Cette technique permet, sur un film 12 complexe ou simple muni d'un ensemble de fermeture 20 avant le passage du col 120, de rapporter une bande 50 de film complexe ou simple qui par soudure longitudinale forme le soufflet de fond 40.This technique allows, on a complex or simple film 12 provided with a closure assembly 20 before the neck 120 passes, to add a strip 50 of complex or simple film which, by longitudinal welding, forms the bottom gusset 40.

Il faut noter également que la soudure transversale 30 peut être droite ou incurvée pour faciliter un automaintien du sachet en position verticale après déploiement du soufflet 40. Plus précisément dans ce cas les soudures transversales 30 réalisées sur les deux côtés du sachet sont symétriques. Pour réaliser de telles soudures transversales 30 incurvées, il suffit de conformer en conséquence les machoires de soudure transversale 140.It should also be noted that the transverse weld 30 can be straight or curved to facilitate self-maintenance of the bag in the vertical position after deployment of the bellows 40. More specifically in this case the transverse welds 30 produced on the two sides of the bag are symmetrical. To produce such curved transverse welds 30, it suffices to conform the transverse welding jaws 140 accordingly.

La bande 50 destinée à former le soufflet 40 peut être pliée au préalable ou pliée sur la conditionneuse. Elle est également préfixée pas à pas au niveau des zones 13 correspondant aux soudures transversales 30, comme indiqué précédemment.The strip 50 intended to form the bellows 40 can be folded beforehand or folded on the conditioner. It is also prefixed step by step at the areas 13 corresponding to the transverse welds 30, as indicated above.

De plus là encore, la dimension du soufflet final 40 dépend de la largeur de la bande 50 utilisée.Also here again, the dimension of the final bellows 40 depends on the width of the strip 50 used.

Bien entendu la présente invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits, mais s'étend à toutes variantes conformes à son esprit.Of course the present invention is not limited to the embodiments which have just been described, but extends to all variants conform to his spirit.

En particulier on notera que le film 12 peut être muni de l'ensemble de fermeture 20 avant la réalisation du pli P (l'ensemble de fermeture 20 étant lié d'origine au film 12 ou rapporté sur celui-ci) ou encore être muni de cet ensemble de fermeture immédiatement en amont du col de formation 120.In particular, it will be noted that the film 12 can be provided with the closure assembly 20 before the ply P is produced (the closure assembly 20 being originally linked to the film 12 or attached to it) or even be provided of this closure assembly immediately upstream of the training neck 120.

Par ailleurs de façon connue en soi, l'avance du film 12 peut être cadencée et synchronisée sur le fonctionnement des machoires 135, 140 de soudure, ou continue.Furthermore, in a manner known per se, the advance of the film 12 can be timed and synchronized with the operation of the welding jaws 135, 140, or continuous.

Selon encore une autre variante il faut noter que dans le cas d'un soufflet de fond rapporté 40, celui-ci peut être réalisé d'une couleur différente du corps du sachet.According to yet another variant, it should be noted that in the case of an attached bottom gusset 40, this can be produced in a color different from the body of the bag.

Par ailleurs dans le cadre de la présente invention les soudures transversales 30 peuvent être réalisées soit pour assurer une liaison entre les deux parois 42 et 44 du soufflet de fond au niveau des soudures transversales 30, soit pour éviter une telle liaison.Furthermore, in the context of the present invention, the transverse welds 30 can be produced either to ensure a connection between the two walls 42 and 44 of the bottom bellows at the level of the transverse welds 30, or to avoid such a connection.

On a par exemple représenté sur la figure 26 annexée une variante de réalisation selon laquelle le sachet 10 comprend deux soufflets longitudinaux 40a, 40b, parallèles aux profilés de fermeture 20. Plus précisément, selon la figure 26 les deux soufflets 40a, 40b, sont équidistants de l'ensemble de fermeture 20. Cependant, cette équi-distance n'est pas absolument requise.There is for example shown in Figure 26 attached an alternative embodiment according to which the bag 10 comprises two longitudinal bellows 40a, 40b, parallel to the closure profiles 20. More specifically, according to Figure 26 the two bellows 40a, 40b, are equidistant of the closure assembly 20. However, this equi-distance is not absolutely required.

Pour réaliser les deux soufflets 40a, 40b, il suffit de réaliser deux plis P sur le film 12 avant d'acheminer celui-ci sur le col de formage 130, ou encore de procéder à l'apport de deux bandes 50 à cet effet, auquel cas le sachet peut être réalisé non pas à l'aide d'un film 12 unique, mais à l'aide de deux feuilles 12a, 12b placées en regard.To make the two bellows 40a, 40b, it suffices to make two folds P on the film 12 before routing the latter onto the forming neck 130, or else to proceed with the supply of two strips 50 for this purpose, in which case the bag can be produced not using a single film 12, but using two sheets 12a, 12b placed opposite.

On a par ailleurs représenté sur la figure 27 une variante de réalisation de sachets comprenant deux soufflets latéraux 40a, 40b, s'étendant perpendiculairement à l'ensemble de fermeture 20. Ces soufflets latéraux 40a ,40b sont obtenus également à l'aide de plis longitudinaux réalisés sur le film avant que celui-ci n'atteigne le col de formage, ou par apport de bandes 50 approprié sur le film, comme décrit précédemment. Dans ce cas, il est prévu des moyens pour déposer l'ensemble de fermeture 20 sur le film 12 transversalement à la direction de déplacement du film. De tels moyens d'acheminement de l'ensemble de fermeture 20 dans une direction transversale peuvent être conformes par exemple aux moyens décrits dans les documents US-A-4617683, US-A-4655862, US-A-4666536, US-A-4701361, US-A-4709398, US-A-4878987, US-A-4844759, US-A-4929225, US-A-4909017 et US-A-5111643. Sur la même figure 27, on a référencé 14 la soudure longitudiale des bords libres du film 12, et 30, 32 les soudures transversales de finition des sachets. On notera qu'avantageuement l'ensemble de fermeture 20 est adjacent à l'une des soudures transversales 32, pour garantir l'étanchéité des sachets malgré la présence des soufflets latéraux 40a, 40b.FIG. 27 also shows an alternative embodiment of bags comprising two lateral bellows 40a, 40b, extending perpendicular to the closure assembly 20. These lateral bellows 40a, 40b are also obtained using folds longitudinal produced on the film before the latter reaches the forming neck, or by adding suitable strips 50 to the film, as described above. In this case, means are provided for depositing the closure assembly 20 on the film 12 transversely to the direction. movement of the film. Such means of conveying the closure assembly 20 in a transverse direction may conform, for example, to the means described in documents US-A-4617683, US-A-4655862, US-A-4666536, US-A- 4701361, US-A-4709398, US-A-4878987, US-A-4844759, US-A-4929225, US-A-4909017 and US-A-5111643. In the same figure 27, reference has been made to 14 the longitudinal weld of the free edges of the film 12, and 30, 32 the transverse welds for finishing the sachets. It will be noted that advantageously the closure assembly 20 is adjacent to one of the transverse welds 32, in order to guarantee the tightness of the bags despite the presence of the lateral bellows 40a, 40b.

Le cas échéant, on peut envisager de réaliser le ou les plis 40 en amont ou en aval du col de formage.If necessary, it is possible to envisage making the fold or folds 40 upstream or downstream of the forming neck.

Selon d'autres variantes de réalisation, le pli 40 destiné à former le soufflet peut être un pli transversal, c'est-à-dire perpendiculaire à la direction de déplacement du film 12.According to other alternative embodiments, the fold 40 intended to form the bellows can be a transverse fold, that is to say perpendicular to the direction of movement of the film 12.

Dans ce cas on peut également prévoir de réaliser le pli 40 sous forme d'un pli en z, transversal, dans le corps du film 12.In this case, it is also possible to provide the fold 40 in the form of a transverse z-fold in the body of the film 12.

Cependant, de préférence, le pli transversal 40 est réalisé à l'aide d'une bande 50 pliée longitudinalement en U sur elle-même, rapportée sur le film 12.However, preferably, the transverse fold 40 is produced using a strip 50 folded longitudinally in a U on itself, attached to the film 12.

On a schématisé sur la figure 28 une telle bande 50 en U, convexité dirigée vers l'arrière par rapport au sens de déplacement du film 12, reliée (venue de matière) initialement aux bandes support 23, 25 des profilés 22, 24. La bande 50 reliée aux profilés 22, 24, déposée sur le film 12, possède une longueur égale à la moitié de la largeur du film 12. Un côté de la bande en U et la bande support adjacente 23 sont soudés sur le film 12 au niveau du poste de dépôt, en amont du col de formage 120. L'autre côté de la bande en U et la seconde bande support 25 sont soudés sur la paroi interne du film 12 constituant l'emballage après repliement de ce film en configuration tubulaire et remplissage de l'emballage, c'est-à-dire lors de la finition de cet emballage, au niveau du poste de soudure transversale 140.There is shown diagrammatically in FIG. 28 such a U-shaped strip 50, convexity directed towards the rear with respect to the direction of movement of the film 12, connected (coming from material) initially to the support strips 23, 25 of the profiles 22, 24. The strip 50 connected to the profiles 22, 24, deposited on the film 12, has a length equal to half the width of the film 12. One side of the U-shaped strip and the adjacent support strip 23 are welded to the film 12 at the level of the deposition station, upstream of the forming neck 120. The other side of the U-shaped strip and the second support strip 25 are welded to the internal wall of the film 12 constituting the packaging after folding of this film in tubular configuration and filling of the packaging, that is to say during the finishing of this packaging, at the transverse welding station 140.

Une telle bande 50 liée aux profilés 22, 24 peut être acheminée transversalement sur le film 12 grâce aux moyens connus à cet effet tels que décrits dans les documents précités.Such a strip 50 linked to the sections 22, 24 can be conveyed transversely on the film 12 by means known for this purpose as described in the aforementioned documents.

Bien entendu, il faut prévoir au niveau du poste 140 de soudure transversale des moyens aptes à sectionner cette bande afin de séparer la bande 50 en U proprement dite, destinée à former un soufflet, et les profilés 22, 24, selon la ligne de découpe référencée 200 sur la figure 28. Ainsi après découpe selon la ligne 200, les profilés 22, 24 sont liés à la zone d'embouchure d'un sachet qui vient d'être individualisé, tandis que la bande 50 en U forme un soufflet de fond pour le sachet en cours de formation.Of course, it is necessary to provide at the level of the transverse welding station 140 means capable of cutting this strip in order to separate the strip 50 in the actual U, intended to form a bellows, and the profiles 22, 24, along the cutting line. referenced 200 in Figure 28. Thus after cutting along line 200, the profiles 22, 24 are linked to the mouth area of a sachet which has just been individualized, while the strip 50 in U forms a bellows of background for the sachet being formed.

La disposition inverse peut être retenue, c'est-à-dire que l'ensemble formant bande 50 en U et profilés 22/24 peut être déposé convexité de la bande en U en avant par rapport à la direction de défilement.The reverse arrangement can be retained, that is to say that the strip forming assembly 50 in a U and sections 22/24 can be deposited convexity of the U strip in front with respect to the direction of travel.

Selon une autre variante schématisée sur la figure 29, une telle bande transversale en U 50 déposée sur le film 12 peut être séparée dès l'origine des profilés transversaux de fermeture 22, 24. On évite ainsi l'opération de sectionnement ultérieur de cette bande comme décrit pour la figure 28. Il reste cependant nécessaire de découper les sachets de façon connue en soi, selon la ligne 202, entre les profilés de fermeture 22, 24 et la bande 50.According to another variant shown diagrammatically in FIG. 29, such a U-shaped transverse strip 50 deposited on the film 12 can be separated from the origin of the transverse closing profiles 22, 24. This avoids the operation of subsequently cutting this strip as described for FIG. 28. However, it remains necessary to cut the bags in a manner known per se, along the line 202, between the closure profiles 22, 24 and the strip 50.

Dans les cas d'utilisation d'une bande transversale en U 50, l'opération de soudure transversale de cette bande 50 sur le film 12 peut être adaptée soit pour fixer les extrémités du pli entre elles, au niveau des surfaces internes du pli, de façon comparable à la figure 27, soit pour laisser libre les surfaces internes du pli, de façon comparable à la figure 26.When using a U-shaped transverse strip 50, the transverse welding operation of this strip 50 on the film 12 can be adapted either to fix the ends of the fold together, at the internal surfaces of the fold, in a manner comparable to FIG. 27, that is to leave the internal surfaces of the fold free, in a manner comparable to FIG. 26.

En outre dans le cadre des mises en oeuvre à pli transversal, on peut de façon comparable aux mises en oeuvre à pli longitudinal, réaliser un pli unique formant de préférence un soufflet de fond de sachet ou des plis multiples formant soufflets latéraux, en association avec des profilés de fermeture qui peuvent être soit parallèles, soit perpendiculaires à ce pli ou ces plis.In addition, in the context of cross-fold implementations, it is possible, in a manner comparable to the longitudinal fold implementations, to produce a single fold preferably forming a bag bottom gusset or multiple folds forming lateral gussets, in combination with closure profiles which can be either parallel or perpendicular to this fold or these folds.

Claims (49)

Machine de formation, remplissage et fermeture automatique de sachets d'emballage réalisés à l'aide d'un film souple (12) muni de profilés de fermeture complémentaires, comportant des moyens (110, 50) aptes à générer au moins un pli (P) sur le film (12) destiné à constituer un sachet, pour former au moins un soufflet sur le sachet final.Machine for forming, filling and automatically closing packaging bags made using a flexible film (12) provided with complementary closure profiles, comprising means (110, 50) capable of generating at least one fold (P ) on the film (12) intended to constitute a sachet, to form at least one bellows on the final sachet. Machine selon la revendication 1, caractérisée par le fait que le pli (P) est longitudinal, parallèle à la direction de déplacement du film (12).Machine according to claim 1, characterized in that the fold (P) is longitudinal, parallel to the direction of movement of the film (12). Machine selon la revendication 1, caractérisée par le fait que le pli (P) est transversal, perpendiculaire à la direction de déplacement du film (12).Machine according to claim 1, characterized in that the fold (P) is transverse, perpendicular to the direction of movement of the film (12). Machine selon l'une des revendications 1 à 3, caractérisée par le fait qu'elle comprend des moyens aptes à acheminer des profilés de fermeture (22, 24), longitudinalement, parallèlement à la direction de déplacement du film (12).Machine according to one of claims 1 to 3, characterized in that it comprises means capable of conveying closure profiles (22, 24), longitudinally, parallel to the direction of movement of the film (12). Machine selon l'une des revendications 1 à 3, caractérisée par le fait qu'elle comprend des moyens aptes à acheminer des profilés de fermeture (22, 24), transversalement, perpendiculairement à la direction de déplacement du film (12).Machine according to one of claims 1 to 3, characterized in that it comprises means capable of conveying closure profiles (22, 24), transversely, perpendicular to the direction of movement of the film (12). Machine selon l'une des revendications 1 à 5, caractérisée par le fait qu'elle comprend des moyens (118) aptes à définir pas à pas des zones (13) de fixation du pli (P) précité.Machine according to one of claims 1 to 5, characterized in that it comprises means (118) capable of defining step by step zones (13) for fixing the above fold (P). Machine selon la revendication 6, caractérisée par le fait que les moyens définissant pas à pas des zones (13) de fixation du pli (P) sont adaptés pour réaliser des zones de fixation en des lieux correspondant aux soudures transversales (30), avant formation des sachets.Machine according to claim 6, characterized in that the means defining step by step zones (13) for fixing the fold (P) are adapted to produce fixing zones at places corresponding to the transverse welds (30), before formation sachets. Machine selon l'une des revendications 1 à 7, caractérisée par le fait qu'elle est adaptée pour réaliser au moins un soufflet parallèle à l'ensemble de fermeture (20).Machine according to one of claims 1 to 7, characterized in that it is adapted to produce at least one bellows parallel to the closure assembly (20). Machine selon l'une des revendications 1 à 7, caractérisée par le fait qu'elle est adaptée pour réaliser au moins un soufflet perpendiculaire à l'ensemble de fermeture (20).Machine according to one of claims 1 to 7, characterized in that it is adapted to produce at least one bellows perpendicular to the closure assembly (20). Machine selon l'une des revendications 1 à 9, caractérisée par le fait qu'elle est adaptée pour réaliser au moins deux soufflets parallèles (40a, 40b) sur le sachet (10).Machine according to one of claims 1 to 9, characterized by the fact that it is adapted to produce at least two parallel bellows (40a, 40b) on the bag (10). Machine selon l'une des revendications 1 à 10, caractérisée par le fait que le pli (P) est réalisé sous forme d'un pli en Z dans le corps du film (12).Machine according to one of claims 1 to 10, characterized in that the fold (P) is produced in the form of a Z-fold in the body of the film (12). Machine selon l'une des revendications 1 à 10, caractérisée par le fait que le pli (P) est réalisé par apport d'une bande (50) pliée en U et correspondant au soufflet (40) recherché, sur un film (12).Machine according to one of claims 1 to 10, characterized in that the fold (P) is produced by adding a strip (50) folded in a U and corresponding to the bellows (40) sought, on a film (12) . Machine selon l'une des revendications 1 à 12, pour la formation de sachets d'emballage à base de film (12), notamment en matériau thermoplastique, comportant des profilés de fermeture (22, 24), par exemple des profilés de fermeture à glissière mâle et femelle complémentaires, comprenant un col de formage (120) qui reçoit en entrée le film (12) à l'état plan en provenance d'un dérouleur (102) et fournit en sortie le film (12) conformé en tube, une goulotte de remplissage (130) qui débouche dans ce col de formage (120) et par conséquent dans ledit tube, des moyens (135) de soudure longitudinale pour fermer le tube longitudinalement et des moyens (140) aptes à générer séquentiellement une première soudure transversale (30) avant qu'un produit ne soit introduit dans le tube par la goulotte de remplissage (130), puis une seconde soudure transversale (30) quand le produit a été introduit dans le tube, pour fermer un emballage autour de ce dernier.Machine according to one of claims 1 to 12, for forming film-based packaging bags (12), in particular of thermoplastic material, comprising closure profiles (22, 24), for example closure profiles with complementary male and female slide, comprising a forming collar (120) which receives the film (12) in the planar state from an unwinder (102) and supplies the film (12) shaped as a tube, a filling chute (130) which opens into this forming neck (120) and consequently into said tube, means (135) of longitudinal weld for closing the tube longitudinally and means (140) capable of sequentially generating a first weld transverse (30) before a product is introduced into the tube by the filler neck (130), then a second transverse seal (30) when the product has been introduced into the tube, to close a packaging around the latter . Machine selon l'une des revendications 1 à 13, caractérisée par le fait que le pli (P) est réalisé avant d'acheminer le film (12) sur un col de formage (120).Machine according to one of claims 1 to 13, characterized in that the fold (P) is produced before routing the film (12) on a forming neck (120). Machine selon l'une des revendications 1 à 13, caractérisée par le fait que le pli (P) est réalisé après avoir acheminé le film (12) sur un col de formage (120).Machine according to one of claims 1 to 13, characterized in that the fold (P) is produced after having conveyed the film (12) on a forming neck (120). Machine selon l'une des revendications 1 à 15, caractérisée par le fait que le soufflet (40) est composé de deux facettes (42, 44) qui forment un dièdre interne au sachet, concave vers l'extérieur.Machine according to one of claims 1 to 15, characterized in that the bellows (40) is composed of two facets (42, 44) which form a dihedral inside the bag, concave towards the outside. Machine selon l'une des revendications 1 à 16, caractérisée par le fait que le film (12) est prémuni des profilés de fermeture (22, 24) avant d'atteindre un col de formage.Machine according to one of claims 1 to 16, characterized in that the film (12) is provided with closure profiles (22, 24) before reaching a forming neck. Machine selon l'une des revendications 1 à 17, caractérisée par le fait que les profilés (22 et 24) sont venus de moulage avec le film (12).Machine according to one of claims 1 to 17, characterized by the fact that the sections (22 and 24) have come from molding with the film (12). Machine selon l'une des revendications 1 à 17, caractérisée par le fait que les profilés (22 et 24) sont rapportés sur le film (12).Machine according to one of claims 1 to 17, characterized in that the profiles (22 and 24) are attached to the film (12). Machine selon l'une des revendications 1 à 17 et 19, caractérisée par le fait qu'elle comprend en outre des moyens aptes à fixer les profilés (22 et 24) sur le film (12), .Machine according to one of claims 1 to 17 and 19, characterized in that it further comprises means capable of fixing the profiles (22 and 24) on the film (12),. Machine selon l'une des revendications 19 ou 20, caractérisée par le fait que les profilés (22 et 24) sont portés par des bandes respectives (23, 25) fixées sur la surface interne du film (12).Machine according to one of claims 19 or 20, characterized in that the profiles (22 and 24) are carried by respective bands (23, 25) fixed on the internal surface of the film (12). Machine selon l'une des revendications 19 ou 20, caractérisée par le fait que les profilés (22 et 24) sont portés par une bande unique (28) repliée en U fixée sur la surface interne du film (12).Machine according to one of claims 19 or 20, characterized in that the profiles (22 and 24) are carried by a single strip (28) folded into a U fixed on the internal surface of the film (12). Machine selon la revendication 22, caractérisée par le fait que la bande (28) en U supportant les profilés (22 et 24) est soudée sur les bords libres (18, 19) du film (12) au niveau de zones situées entre les profilés (22, 24) et le centre de la bande (28) de sorte que la pression interne au sachet ne sollicite pas les profilés (22, 24) à l'ouverture.Machine according to claim 22, characterized in that the U-shaped strip (28) supporting the profiles (22 and 24) is welded to the free edges (18, 19) of the film (12) at the zones located between the profiles (22, 24) and the center of the strip (28) so that the internal pressure in the bag does not stress the profiles (22, 24) at the opening. Machine selon l'une des revendications 22 ou 23, caractérisée par le fait que la bande (28) en U supportant les profilés (22, 24) est soudée sur sa largeur, sur les bords (18, 19) du film (12) pour former une première toile extérieure (29), passant par l'âme de la bande (28) en U, et une deuxième toile (30) intérieure passant par les profilés (22 et 24), la deuxième toile intérieure (30) étant de dimension plus longue que la toile extérieure (29) de sorte que la pression interne au sachet ne sollicite pas les profilés (22 et 24) à l'ouverture.Machine according to either of Claims 22 and 23, characterized in that the U-shaped strip (28) supporting the profiles (22, 24) is welded across its width, to the edges (18, 19) of the film (12) to form a first external fabric (29), passing through the web of the U-shaped band (28), and a second internal fabric (30) passing through the profiles (22 and 24), the second internal fabric (30) being of longer dimension than the outer fabric (29) so that the internal pressure in the bag does not stress the profiles (22 and 24) at the opening. Machine selon l'une des revendications 1 à 24, caractérisée par le fait que le fim (12) est un film souple simple monocouche ou un film complexe composé de différentes couches adjacentes, par exemple coextrudées.Machine according to one of claims 1 to 24, characterized in that the film (12) is a simple flexible single-layer film or a complex film composed of different adjacent layers, for example coextruded. Machine selon l'une des revendications 1 à 25, caractérisée par le fait qu'elle comprend une chicane (110) formée de deux plaques (112 et 114) superposées en recouvrement pour la réalisation du pli (P) en Z.Machine according to one of claims 1 to 25, characterized in that it comprises a baffle (110) formed by two plates (112 and 114) superimposed in overlap for producing the fold (P) in Z. Machine selon la revendication 26, caractérisée par le fait qu'elle comprend des moyens aptes à modifier le recouvrement des plaques (112, 114).Machine according to claim 26, characterized in that that it comprises means capable of modifying the overlap of the plates (112, 114). Machine selon l'une des revendications 1 à 27, caractérisée par le fait que les moyens de fixation (118) sont conçus pour fixer le pli (P) par soudure, décharge statique ou collage partielMachine according to one of claims 1 to 27, characterized in that the fixing means (118) are designed to fix the fold (P) by welding, static discharge or partial gluing Machine selon l'une des revendications 1 à 28, caractérisée par le fait que les moyens de fixation (118) sont réglables sur la longueur du film (12).Machine according to one of claims 1 to 28, characterized in that the fixing means (118) are adjustable over the length of the film (12). Machine selon l'une des revendications 1 à 29, caractérisée par le fait qu'elle comprend un système de guidage des parois du film (12), comportant des roulettes à axe de déroulement contrôlé ou un autre système de guidage des bords du film (12).Machine according to one of claims 1 to 29, characterized in that it comprises a system for guiding the walls of the film (12), comprising rollers with a controlled unwinding axis or another system for guiding the edges of the film ( 12). Machine selon l'une des revendications 1 à 30, caractérisée par le fait qu'elle comprend un jeu de pinces pneumatiques, hydrauliques, électromagnétiques ou mécaniques (150) qui pincent et étirent le film (12) au moment de la soudure transversale.Machine according to one of claims 1 to 30, characterized in that it comprises a set of pneumatic, hydraulic, electromagnetic or mechanical clamps (150) which clamp and stretch the film (12) at the time of the transverse welding. Machine selon l'une des revendications 1 à 31, caractérisée par le fait que le pli (P) est finalisé par forçage dans le tube de conditionnement (130).Machine according to one of claims 1 to 31, characterized in that the fold (P) is finalized by forcing in the conditioning tube (130). Machine selon la revendication 32, caractérisée par le fait que le col de formation et remplissage (130) comprend une fenêtre (132) d'entrée du pli P.Machine according to claim 32, characterized in that the forming and filling neck (130) comprises a window (132) for entering the P fold. Machine selon l'une des revendications 1 à 33, caractérisée par le fait que la soudure transversale (30) est incurvée pour faciliter un automaintien du sachet en position verticale après déploiement du soufflet (40).Machine according to one of claims 1 to 33, characterized in that the transverse weld (30) is curved to facilitate self-maintenance of the bag in the vertical position after deployment of the bellows (40). Machine selon l'une des revendications 1 à 34, caractérisée par le fait que le soufflet rapporté (40) est d'une couleur différente du corps du sachet.Machine according to one of claims 1 to 34, characterized in that the attached bellows (40) is of a different color from the body of the bag. Machine selon l'une des revendications 1 à 35, caractérisée par le fait qu'elle est adaptée pour fixer les extrémités du pli (P) au niveau des surfaces internes de celui-ci.Machine according to one of claims 1 to 35, characterized in that it is adapted to fix the ends of the fold (P) at the internal surfaces thereof. Machine selon l'une des revendications 1 à 35, caractérisée par le fait qu'elle est adaptée pour laisser libre les extrémités du pli (P) au niveau des surfaces internes de celui-ci.Machine according to one of claims 1 to 35, characterized in that it is adapted to leave the ends of the pleat (P) free at the internal surfaces thereof. Machine selon l'une des revendications 1 à 37, caractérisée par le fait qu'elle comprend des moyens aptes à acheminer transversalement une bande en U (50) venue de matière avec des bandes support (23, 25) de profilés (22, 24), des moyens aptes à fixer cette bande en U (50) et les bandes support associées (23, 25) sur le film (12), et des moyens aptes à opérer ensuite une ligne de découpe (200) entre la bande en U (50) et les bandes (23, 25) support de profilés (22, 24).Machine according to one of claims 1 to 37, characterized in that it comprises means capable of conveying transversely a U-shaped strip (50) made in one piece with support strips (23, 25) of profiles (22, 24 ), means capable of fixing this U-shaped strip (50) and the associated support strips (23, 25) on the film (12), and means suitable for then operating a cutting line (200) between the U-shaped strip (50) and the strips (23, 25) support for profiles (22, 24). Machine selon l'une des revendications 1 à 37, caractérisée par le fait qu'elle comprend des moyens aptes à acheminer transversalement une bande (50) en U et à fixer cette bande (50) sur le film (12).Machine according to one of claims 1 to 37, characterized in that it comprises means able to convey transversely a strip (50) in a U shape and to fix this strip (50) on the film (12). Machine selon l'une des revendications 38 ou 39, caractérisée par le fait qu'une première aile de la bande en U (50) est fixée sur le film (12) avant mise en forme tubulaire de celui-ci, tandis que la seconde aile de cette bande (50) est fixée sur le film (12) au cours de l'étape de finition des sachets.Machine according to one of claims 38 or 39, characterized in that a first wing of the U-shaped band (50) is fixed on the film (12) before tubular shaping of the latter, while the second wing of this strip (50) is fixed to the film (12) during the stage of finishing the sachets. Machine selon l'une des revendications 38 à 40, caractérisée par le fait que la bande (50) en U possède une longueur égale à la moitié de la largeur du film (12).Machine according to one of claims 38 to 40, characterized in that the U-shaped strip (50) has a length equal to half the width of the film (12). Procédé de fabrication de sachets d'emballage à l'aide d'un film souple (12) muni de profilés de fermeture complémentaires, sur une machine de formation, remplissage et fermeture automatique, comportant l'étape qui consiste à générer au moins un pli (P) sur le film (12) destiné à constituer un sachet, pour former au moins un soufflet sur le sachet final.Method for manufacturing packaging bags using a flexible film (12) provided with complementary closure profiles, on a forming, filling and automatic closing machine, comprising the step which consists in generating at least one fold (P) on the film (12) intended to constitute a sachet, to form at least one bellows on the final sachet. Procédé selon la revendication 42, caractérisé par le fait qu'il comprend l'étape qui consiste à définir pas à pas des zones (13) de fixation du pli précité.Method according to claim 42, characterized in that it comprises the step which consists in defining step by step zones (13) for fixing the aforementioned fold. Procédé selon la revendication 43, caractérisé par le fait que les lieux de fixation du pli correspondent aux lieux de soudures transversales (30) ultérieures.Method according to claim 43, characterized in that the places of attachment of the fold correspond to the places of subsequent transverse welds (30). Procédé selon l'une des revendications 42 à 44, caractérisé par le fait que l'étape de génération du pli (P) consiste à réaliser un pli en Z dans le corps du film (12).Method according to one of claims 42 to 44, characterized in that the step of generating the fold (P) consists in producing a Z-fold in the body of the film (12). Procédé selon l'une des revendications 42 à 44, caractérisé par le fait que l'étape de génération du pli (P) consiste à réaliser le pli par apport d'une bande (50) pliée longitudinalement et correspondant au soufflet recherché (40), sur un film (12).Method according to one of claims 42 to 44, characterized in that the step of generating the fold (P) consists in making the fold by supply of a strip (50) folded longitudinally and corresponding to the desired bellows (40), on a film (12). Procédé selon l'une des revendications 42 à 46, caractérisé par le fait qu'il comprend en outre l'étape consistant à acheminer des tronçons de profilés de fermeture (22, 24) sur le film (12), transversalement à la direction de déplacement de celui-ci.Method according to one of claims 42 to 46, characterized in that it further comprises the step consisting in conveying sections of closure profiles (22, 24) on the film (12), transversely to the direction of displacement of it. Procédé selon l'une des revendications 42 à 47, caractérisé par le fait qu'il comprend l'étape consistant à acheminer transversalement une bande en U (50) venue de matière avec des bandes support (23, 25) des profilés de fermeture (22, 24), à fixer cette bande en U (50) et les bandes support associées (23, 25) sur le film (12) et à opérer ensuite une ligne de découpe (200) entre la bande en U (50) et les bandes (23, 25) support de profilés (22, 24).Method according to one of claims 42 to 47, characterized in that it comprises the step consisting in transversely conveying a U-shaped strip (50) made of material with support strips (23, 25) of the closure profiles ( 22, 24), to fix this U-shaped band (50) and the associated support bands (23, 25) on the film (12) and then to operate a cutting line (200) between the U-shaped band (50) and the strips (23, 25) supporting profiles (22, 24). Procédé selon la revendication 48, caractérisé par le fait qu'une première aile de la bande en U (50) est fixée sur le film (12) avant mise en forme tubulaire de celui-ci, tandis que la seconde aile de cette bande est fixée sur le film (12) au cours de l'étape de finition des sachets.Method according to claim 48, characterized in that a first wing of the U-shaped strip (50) is fixed to the film (12) before tubular shaping thereof, while the second wing of this strip is fixed on the film (12) during the step of finishing the sachets.
EP97400407A 1996-02-27 1997-02-25 Automatic machine and method for forming, filling and closing packaging bags Expired - Lifetime EP0792801B1 (en)

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FR9602389A FR2745263B1 (en) 1996-02-27 1996-02-27 MACHINE AND METHOD FOR AUTOMATICALLY FORMING, FILLING AND CLOSING PACKAGING BAGS
FR9602389 1996-02-27

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EP0792801A1 true EP0792801A1 (en) 1997-09-03
EP0792801B1 EP0792801B1 (en) 2003-09-10

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EP (1) EP0792801B1 (en)
AT (1) ATE249361T1 (en)
DE (1) DE69724680T2 (en)
ES (1) ES2205141T3 (en)
FR (1) FR2745263B1 (en)

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Also Published As

Publication number Publication date
US5826401A (en) 1998-10-27
ATE249361T1 (en) 2003-09-15
DE69724680T2 (en) 2004-07-22
ES2205141T3 (en) 2004-05-01
FR2745263A1 (en) 1997-08-29
EP0792801B1 (en) 2003-09-10
FR2745263B1 (en) 1998-05-07
DE69724680D1 (en) 2003-10-16

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