EP0951989B1 - Process for making bags with closure - Google Patents

Process for making bags with closure Download PDF

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Publication number
EP0951989B1
EP0951989B1 EP99400946A EP99400946A EP0951989B1 EP 0951989 B1 EP0951989 B1 EP 0951989B1 EP 99400946 A EP99400946 A EP 99400946A EP 99400946 A EP99400946 A EP 99400946A EP 0951989 B1 EP0951989 B1 EP 0951989B1
Authority
EP
European Patent Office
Prior art keywords
film
bag
web
sealing
strips
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.)
Expired - Lifetime
Application number
EP99400946A
Other languages
German (de)
French (fr)
Other versions
EP0951989A1 (en
Inventor
Steven Ausnit
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
Original Assignee
Flexico France SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR9804913A external-priority patent/FR2777498B1/en
Application filed by Flexico France SARL filed Critical Flexico France SARL
Publication of EP0951989A1 publication Critical patent/EP0951989A1/en
Application granted granted Critical
Publication of EP0951989B1 publication Critical patent/EP0951989B1/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
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2516—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener
    • B65D33/2533—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener the slide fastener being located between the product compartment and the tamper indicating means
    • 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
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2516—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener
    • B65D33/2525—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener located between the fastener and the product compartment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2541—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor characterised by the slide fastener, e.g. adapted to interlock with a sheet between the interlocking members having sections of particular shape
    • 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
    • B31B70/8133—Applying the closure elements in the cross direction

Definitions

  • the present invention relates to the field of machines for forming, filling and closing automatic packaging, comprising closure devices, for example with complementary male and female profiles.
  • Such machines are often called FFS, corresponding to the initials of the English expression "Form, Fill and Seal machines”.
  • the document US 4,909,017 describes a method in which sachets are provided with a closure device, during their formation on an FFS machine.
  • the bags are formed from a film of thermoplastic material.
  • the film is in the form of a strip of material extending between two longitudinal free edges with reference to its displacement. This film is unrolled upstream of a filler neck.
  • the closure device is disposed on the film, also upstream of the chute, transversely to the direction of movement of the film.
  • the closure device is composed of two strips provided with complementary profiles.
  • a first band of the closure device is welded to the film upstream of the chute, on a portion of the film intended to form a first wall of the bag.
  • the bag is then formed by wrapping the chute and welding the two longitudinal edges of the film.
  • the second closure band is then welded downstream of the chute to a second bag wall.
  • the document US 4,655,862 also discloses a method of forming reclosable bags on FFS machines, in which pouches are provided with a closure device which is arranged perpendicular to the direction of formation of these bags.
  • This closure device is deposited upstream of the filler neck, on a film in the form of a single strip.
  • This band comprises at least one folding zone transverse to the band, so as to be able to fold the band on itself and to put in opposite, regions of the band able to cooperate together to ensure the closure of the bag.
  • the document US-A-5,431,760 discloses a bag closure device comprising a control slider and two webs extending laterally on at least one side of an assembly of one or more profiles.
  • the Applicant has desired that the steps of holding, welding and placing the closure device on the film is easier to achieve than that of the processes described in the aforementioned documents.
  • the sails of the closure device confer on the invention a certain number of advantages. Due to its larger cross-sectional area, a device for carrying out the method according to the invention is easily carried and positioned. In addition, the sails can be set at temperatures low enough to avoid damaging the profiles.
  • Each band 2, 4 comprises webs 6, 8 and sections 10, 12.
  • the sections 10, 12 extend longitudinally on the strips 2, 4.
  • the profiles 10, 12 have shapes capable of cooperating with each other in a complementary manner.
  • said male section has a cross-section, a shape arrowhead, it can be introduced and maintained in engagement with the section 12, said female section, throat-shaped.
  • Each strip 2, 4 may comprise several profiles 10, 12 similar to, for example, those described above. These profiles are then parallel to each other.
  • the strips 2, 4 respectively comprise a first web 6 and a second web 8 which extend widely laterally on one side of the profile (s) 10, 12.
  • this first web 6 and this second web 8 may be replaced by a first 6 and a second 8 parts of a single web for joining the two bands 2,4.
  • the closing devices 1 Figures 1a and 1b comprise two complementary sections 10, 12, each supported by one of the two parts 6, 8 of a single U-shaped web in section transverse to the longitudinal direction of the profiles 10, 12.
  • the profiles 10, 12 of the device 1 of closure of the figure 1a are close to the bottom of the groove of the U.
  • the profiles 10, 12 of the closure device 1 of the figure 1b are near the free ends of the branches of the U.
  • the sails 6, 8 of the closure device 1 of the figure 1c are independent of each other.
  • the profiles 10, 12 of the closure device 1 of the figure 1c are close to a free sail edge 6, 8.
  • These devices are particularly adapted to be fixed on the film 50 since the surface of the webs 6, 8 is such that it makes it possible to perform a welding of these webs 6, 8 on the film 50 on an area of these which does not not found under the profiles 10, 12. This facilitates the establishment of the closure device 1 and the welding thereof on the film 50.
  • At least one web 6, 8 extends laterally over an area at least equal in surface to that located under the profiles 10, 12.
  • the method according to the invention is used to form sachets 30 on an FFS 100 machine.
  • the step of fixing the first web 6 on a film 50 is performed upstream of a filling chute 130 of the FFS machine 100.
  • figure 2 there is shown a portion of the film 50 for forming bags 30.
  • the film 50 moves towards the chute 130 in the direction indicated by the arrow D.
  • the film 50 has two longitudinal free edges 52, 54, parallel to its direction of movement.
  • a closure device 1 Crosswise with respect to the direction of movement of the film 50, is provided a closure device 1. This device 1 is oriented on the film 50, so that the sections 10, 12 are generally perpendicular to the longitudinal edges 52, 54 of the film 50.
  • This device 1 may be one of the three devices 1 represented in FIG. figure 1 or one of those presented below or any device 1 adapted to the implementation of the method according to the invention.
  • the device 1 has a length approximately equal to half the size of the film 50, taken perpendicular to its direction of displacement D.
  • the device 1 can be placed near one of the longitudinal free edges 52, 54.
  • the device 1 is fixed approximately centrally with respect to the two longitudinal free edges 52, 54.
  • a device 1 is guided, pulled or pushed by roller means and / or by a reciprocating mechanism to be positioned on the film surface 50.
  • the device 1 is arranged on the film 50, so that one of the two strips 2, 4 is laid flat on one side of the film 50, on a portion of the film 50 capable of forming a film.
  • first wall of bag 30 On the figure 2 it is the web 2 provided with the web 6 which rests on the surface of the film 50.
  • the device 1 is advantageously provided, prior to its positioning on the film 50, with two weld spots 42, 44. Each is located at a longitudinal end 3, 5 of the strips 2, 4, more precisely at the level of the profiles 10, 12, and thus contributes to sealing the closure device 1.
  • first transverse welding means 110 comprise a transverse welding bar 112 and two longitudinal bars 114 with respect to the direction of movement D of the film 50.
  • the length of the welding bar 112 is approximately equal to that of the device 1 to set up and fix on the film 50.
  • the two welding bars 114 are located at the ends of the welding bar 112, perpendicular to this, and have a length approximately equal to the width of the device 1.
  • the welding bars 112, 114 are then lowered and pressed on the edge of the webs 6, 8 together or independently of one another.
  • the step of fixing the first web 6 on the film 50 is carried out only by the longitudinal ends 3, 5 of the strips 2, 4, thanks to the longitudinal welding bars 114.
  • the fixation of the first web 6 on the film 50 is carried out thanks to the welding bar 112, only on the edge of the web 6 intended to be towards the outside of the bag 30 with respect to sections 10, 12, when this bag 30 will be formed.
  • the attachment of the first web 6, upstream of the chute is achieved by combining the two previous variants,
  • the fixing of the first web 6 is performed at at least two points 47, 49 located on either side of the profile 10 supported by the web 6, this section being considered relative to its longitudinal direction .
  • the first web 6 is thus integral with the film 50, at a point situated towards the front and at a point situated towards the rear, with respect to the direction of displacement D. This makes it possible to prevent the device 1 from turning around. during the formation of the bag 30 on the chute 130 ( Fig. 2 and Fig. 21 ).
  • a machine according to the present invention can also make it possible to carry out this variant of the method according to the invention.
  • the fixation of the closure device 1 on the film 50 can be performed, before formation of the bag 30, simultaneously with the production of the weld spots 42, 44.
  • the device 1 is conveyed on the film 50 without that the weld points 42, 44 have been made.
  • suitable longitudinal welding bars 114 weld the longitudinal ends 3, 5 of the strips 2, 4 by the same operation as that which produces the soldering points 42, 44.
  • FIG. 3 On the figure 3 , is shown the formation of a bag 30 from the film 50, around the chute 130.
  • the film 50 provided with the device 1 is fed to the chute 130. It is then wrapped around this chute 130.
  • the longitudinal free edges 52, 54 are brought back to one another, parallel to the axis of the chute 130, to be welded to one another by means of longitudinal welding means 120 capable of forming a longitudinal weld 40. thus folding the film 50, longitudinally with respect to its direction of displacement, a second wall 34 of the bag 30 is formed.
  • a bag 30 has two longitudinal folds 31, 33, an opening closed by the device 1, and is hermetically sealed by the longitudinal weld 40 and a transverse weld 46.
  • the transverse weld 46 extends between the longitudinal folds 31, 33 and is located on the edge of the walls 32, 34 opposite longitudinally to the device 1.
  • second transverse welding means 116 are represented on the figure 4 . These second transverse welding means 116 are adapted to fix the second web 6 of the device 1 to the second wall 34 of bags 30 downstream of the chute 130.
  • the second transverse welding means 116 make it possible both to weld the device 1 to the walls 32, 34 and to form the transverse weld 46.
  • the cutting means 140 are integrally mounted to the second transverse welding means 116, in order to proceed to the cutting of the successive bags 30. These cutting means 140 are able to form a transverse cut with respect to the displacement of the film 50.
  • the second transverse welding means 116 are each provided with a groove 117.
  • This groove 117 extends over the entire length of the second transverse welding means 116.
  • the grooves 117 of each of the second welding means 116 are in contact with each other. face to face and are turned towards each other to form a cavity.
  • These grooves 117 make it possible not to weld between them the walls 32, 34 on a small transverse zone, downstream of the closure device. This transverse zone makes it possible to form tongues 36, 38 making it possible to grip the walls 32, 34 so as to spread them and to open the bag 30.
  • the closure device 1 for implementing the method according to the invention comprises a closing slider 9.
  • This closing slider 9 can be of any known type and suitable for putting the profiles 10, 12 into engagement with each other in a first direction and disengaging them from each other when moved in a second opposite direction to the first.
  • the film manufacturing method 50 according to the invention must be adapted.
  • it comprises a step consisting in conveying a film 50 provided with first cut-outs 51 upstream of the chute 130.
  • the first cut-outs 51 are able to allow easy access to the closing slider 9 over the entire length of the profiles 10, 12.
  • they are of a shape and dimensions that are slightly smaller than those of the closure device 1.
  • the method according to the invention then comprises a step of positioning a closure device 1 at each of the first cutouts 51, upstream of the filler neck 130.
  • the closure device 1 is already provided with the closing slider 9 and the longitudinal ends 3, 5 are possibly already welded together by welding points 42, 44.
  • the closure device 1 is thus positioned so that the closing slider 9 is on the longitudinal edge of the closure device 1, located forwards, taking for reference the direction of movement D of the film 50. At least 1 one of the webs 6, 8 is then welded to the film 50 at at least one edge of the first cutouts 51, by virtue of the first transverse welding means 110.
  • the film 50 thus provided with closure devices 1 is shaped as a tube around the chute 130.
  • a longitudinal weld 40 is formed by the longitudinal welding means 120.
  • a second cut 53 is made downstream of the longitudinal welding means 120. This second cutout 53 is made in the film 50, opposite the first cut 51. This second cut 53 has a shape and a dimension equivalent to those of the first cuts 51.
  • the second cuts 53 are made by means of a blade 135. If this blade 135 is located at the chute 130, it is curved.
  • the welding of the closure device 1 is then completed by the second transverse welding means 116.
  • the shape of these second transverse welding means 116 is adapted for welding closure devices 1
  • transverse welding means 116 Examples of such transverse welding means 116 are illustrated by the Figures 4A and 5A .
  • the second transverse welding means comprise an opening 118.
  • This opening 118 is parallel to the benefits 10, 12 and of length approximately equal to that of these profiles 10, 12.
  • the width of this opening is sufficient for the welding rods second welding means 116 are not applied to the closing slider 9 during the welding of the closure device 1 on the film 50.
  • the welding means 116 thus weld on the film 50 only the sails 6, 8 of the closing device 1, possibly with the longitudinal ends 3, 5 of the strips 2, 4.
  • the second welding means 116 thus form the transverse seals 46 and 48 of the bag 30.
  • the second transverse welding means 116 have a U-shape in transverse section.
  • This form provides grooves 117 forming a cavity which is adapted to receive the profiles 10, 12 and the closing slider 9, without deforming them when the welding bars of the second welding means 116 are pressed against each other for form the transverse welds 46 and 48.
  • peelable welding strips 18, 20 are arranged between the webs 6, 8 on the side of these webs 6, 8 intended to be towards the inside of the bag 30.
  • the chute 130 is provided with a longitudinal groove capable of guiding the closing sliders 9 during the passage of the closure devices 1 on this chute 130.
  • figure 6 represents a closing device 1 provided, in addition to its webs 6, 8 and its sections 10, 12, of two strips 18, 20 able to form a peelable weld. These strips of peelable weld 18, 20 extend over the entire length of the device 1, at the edges of the free ends of the webs 6, 8. This peelable weld 18, 20 therefore joins the sails 6, 8, or parts of the sails, the side that will be located towards the outside of the bag 30 relative to the profiles 10, 12, after complete formation of this bag.
  • the figure 7a illustrates, at the second transverse welding means 116, the positioning and welding of the device 1 on the walls 32, 34.
  • the device of the figure 6 is represented in closed configuration.
  • the peelable seal strips 18, 20 are presolded to one another.
  • the free edge of one of the webs 6, 8 of the device 1 is fixed to the wall 34 by means of the first welding means 110.
  • the peelable solder strips 18, 20 are not presolded and are then welded together and on the wall 34 during the operation of fixing the web 6 on this wall 34 by the first welding means 110.
  • all the walls 32, 34, webs 6, 8 and strips of peelable weld 18, 20 is welded by the second transverse welding means 116.
  • the fixing of the device 1 on the walls 32, 34 is completed, simultaneously with the formation of the weld 46 and the cutting of the walls 32, 34, between the solder 46 of a bag and the closure device 1 of the next bag ( Fig. 7b ).
  • the groove 117 of the second transverse welding means 116 makes it possible to keep two zones of the unsealed walls 32, 34 in order to form tabs 36, 38 on the side of the sections 10, 12 located towards the outside of the bag 30. .
  • a closure device provided with two protective strips 14, 16. These protective strips 14, 16 extend over the entire length of the longitudinal free edges of the webs 6, 8. These protective strips are provided with a layer barrier on their faces brought to be opposite, which allows the protective strips not to weld together.
  • the device 1 is welded to the walls 32, 34 with second transverse welding means 116, not provided with grooves 117.
  • the walls 32, 34 are welded to the device 1 at the same time at the level of the peelable sealing strips 18, 20 and at the level of the protective strips 14, 16. But the protection strips 14, 16 are not welded together. There are thus tabs 36, 38 adapted to grip the walls 32, 34 of the bag 30 to proceed to the opening of the latter.
  • the figure 10 schematically represents a closure device 1, provided with a line of perforations 22.
  • This line of perforations 22 is, when the device 1 is in the open position between the profiles 10 and 12, approximately equal distance from each.
  • This line of perforations 22 extends over the entire length of the device 1 at the bottom of the U-shaped groove formed by it, when it is in closed configuration. After opening the bag 30, separating the strips of peelable solder 18, 20 and the complementary profiles 10, 12, the device 1 is torn at the level of the perforation line 22.
  • the figure 11 represents a variant of the device 1 presented to the figure 10 .
  • a thin web 7 forms the groove of the U between the sections 10, 12.
  • This thin web 7 can easily be torn to open the bag 30 but it offers, as long as it is intact, a means for sealing additional device 1 closure. If this web 7 extends sufficiently, it can turn towards and between the webs 6, 8 when the contents of the bag 30 is poured, to protect the sections 10, 12 of the contents of the bag 30.
  • the sections 10, 12 thus protected remain clean and able to cooperate effectively with each other, when it is desired to close the bag 30.
  • This veil 7 can also form a funnel or pouring spout when it is pulled out of the bag 30 ( Fig. 12 ).
  • the web 7 consists of two roughly trapezoidal elements arranged one on the other and linked together on the two non-parallel edges of the trapeziums and on the short edge of the two parallel edges.
  • the length of the one of the two parallel edges of the trapezium which is the longest, is equal to the dimension of the bag 30 transversely with respect to the direction of displacement D of the film 50.
  • These two nonparallel edges are welded between and with the longitudinal ends 3, 5 with respect to the strips 2, 4.
  • a closure device 1 further comprising strips of peelable weld 18, 20, the complementary profiles 10, 12 and the webs 6, 8, a sealing membrane 26.
  • This membrane 26 is welded over the entire length of the device 1, for example near the peelable seal 18, between this peelable solder strip 18 and the profile 10.
  • This sealing membrane 26 extends laterally towards the other section 12 by covering the section 10.
  • the figure 14 shows the device 1 shown in figure 13 in closed position. We then see that the sealing membrane 26 is taken between the sections 10 and 12.
  • the figure 15 represents a device similar to that of Figures 13 and 14 , with the difference that it comprises two sealing membranes 26 each welded to one of the webs 6, 8.
  • FIGS. 16 to 20 represent variants of a closure device 1 comprising at least one peelable solder strip 18, 20, 21 and a line of perforations 19.
  • FIG 16 there is shown a device 1 which has a single peelable solder strip 21 fixed between the webs 6 and 8.
  • the line of perforations 19 is on the edge of the peelable solder strip 21 located towards the outside of the bag 30 and between the sails 6 and 8.
  • This line of perforations extends over the entire length of the device 1. It makes it possible to tear the peelable weld more easily when the walls 32 and 34 are moved apart to open the bag 30.
  • the figure 17 represents a device 1 in the open configuration.
  • the perforation line 19 is located between the sections 10 and 12, approximately equal distance from each of them, at the joint of the webs 6 and 8. Strips of peelable weld 18, 20 along this line of perforations 19 over the entire length of the closing device 1.
  • the figure 18 represents, in the closed position, the device 1 of the figure 17 fixed to a bag 30.
  • a bag 30 To open the bag 30, its walls 32, 34 are spread, which induces a stress between the webs 6 and 8 and causes the tearing of the line of perforations 19.
  • This bag 30 may optionally be closed again. pressing on one another the strips of peelable weld 18 and 20, if they are for example adhesive strips. This then ensures a greater seal than with the only cooperation of the profiles 10, 12 with each other.
  • the Figures 19 and 20 represent a closing device such as that shown in Figures 17 and 18 , further comprising a sealing membrane 26.
  • This sealing membrane 26 is welded to the web 8, close to the peelable welding strip 20 and extends laterally above the section 12.
  • the figure 21 represents a closure device attached to a film 50 (for example before passing over the filling chute 130 of an FFS machine).
  • This device 1 consists of two webs 6, 8 joined together to form a U.
  • the sail 6 is fixed to the film 50 by two welding points 47, 49, located on the web 6 on either side of the direction longitudinal of the profile 10. These welding points 47, 49 may be made before folding the device 1 on itself to cooperate the sections 10, 12 between them.
  • the welding points 47, 49 may be more or less extended in the longitudinal direction of the strips 2, 4. They may also extend over the entire length of the device 1.
  • the device 1 can not be retained to the film 50 only by a single 49 of these welding points 47, 49.
  • the point 49 is the one situated downstream with respect to the displacement D of the film 50, so as to avoid a reversal of the device 1 to the passage on the filler neck 130.
  • one of these welding points 47, 49 is located on the side of the profiles 10, 12 which will be inside the bag 30 once it formed. In this case, no equivalent welding point will be made opposite, on the second web 8. In this way, a hinge configuration is formed which offers a better resistance to an internal pressure of the bag 30 (FIG. figure 22 ).
  • the invention also extends to a machine for manufacturing a film 50 for forming bags 30, comprising first transverse welding means 110, with respect to the direction of movement of the film 50, capable of fixing a closing device 1 provided with webs 6, 8 on the film 50.
  • closure devices 1 are fixed to the film 50 only by a first web 6. Bags 30 can then be shaped and completed from of this film 50 provided with closure devices 1, either on a bag-forming machine 30 to be used and subsequently filled, or on an FFS machine.
  • the invention therefore also extends to a machine for forming, filling and automatic closing, which comprises first transverse welding means 110, upstream of a filler chute 130 and second transverse welding means 116 downstream of the trough 130.
  • first transverse welding means 110 upstream of a filler chute 130
  • second transverse welding means 116 downstream of the trough 130.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Description

La présente invention concerne le domaine des machines de formation, remplissage et fermeture automatiques d'emballages, comportant des dispositifs de fermeture, par exemple avec profilés mâle et femelle complémentaires.The present invention relates to the field of machines for forming, filling and closing automatic packaging, comprising closure devices, for example with complementary male and female profiles.

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

Le document US 4 909 017 décrit un procédé au cours duquel des sachets sont munis d'un dispositif de fermeture, lors de leur formation sur une machine FFS. Les sachets sont formés à partir d'un film de matériau thermoplastique. Le film est sous forme d'une bande de matière s'étendant entre deux bords libres longitudinaux en référence à son déplacement. Ce film est déroulé en amont d'une goulotte de remplissage. Le dispositif de fermeture est disposé sur le film, aussi en amont de la goulotte, transversalement par rapport à la direction de déplacement du film. Le dispositif de fermeture est composé de deux bandes munies de profilés complémentaires. Une première bande du dispositif de fermeture est soudée sur le film en amont de la goulotte, sur une partie du film destinée à former une première paroi de sachet. Le sachet est ensuite formé en enveloppant la goulotte et en soudant les deux bords longitudinaux du film. La deuxième bande de fermeture est alors soudée en aval de la goulotte sur une deuxième paroi de sachet.The document US 4,909,017 describes a method in which sachets are provided with a closure device, during their formation on an FFS machine. The bags are formed from a film of thermoplastic material. The film is in the form of a strip of material extending between two longitudinal free edges with reference to its displacement. This film is unrolled upstream of a filler neck. The closure device is disposed on the film, also upstream of the chute, transversely to the direction of movement of the film. The closure device is composed of two strips provided with complementary profiles. A first band of the closure device is welded to the film upstream of the chute, on a portion of the film intended to form a first wall of the bag. The bag is then formed by wrapping the chute and welding the two longitudinal edges of the film. The second closure band is then welded downstream of the chute to a second bag wall.

Le document US 4 655 862 décrit aussi un procédé de formation de sacs refermables, sur machines FFS, au cours duquel des sachets sont munis d'un dispositif de fermeture qui est disposé perpendiculairement à la direction de formation de ces sacs. Ce dispositif de fermeture est déposé en amont de la goulotte de remplissage, sur un film sous forme d'une seule bande. Cette bande comprend au moins une zone de pliage transversale à la bande, de manière à pouvoir replier la bande sur elle-mème et mettre en vis à vis, des régions de la bande aptes à coopérer ensemble pour assurer la fermeture du sachet.The document US 4,655,862 also discloses a method of forming reclosable bags on FFS machines, in which pouches are provided with a closure device which is arranged perpendicular to the direction of formation of these bags. This closure device is deposited upstream of the filler neck, on a film in the form of a single strip. This band comprises at least one folding zone transverse to the band, so as to be able to fold the band on itself and to put in opposite, regions of the band able to cooperate together to ensure the closure of the bag.

Le document WO-A-98/03328 décrit diverses modalités de fabrication de sachets comprenant des profilés de fermeture.The document WO-A-98/03328 describes various methods of manufacturing sachets comprising closure profiles.

Le document US-A-5 431 760 décrit un dispositif de fermeture de sachets comprenant un curseur de commande et deux voiles s'étendant latéralement sur au moins un côté d'un ensemble d'un ou plusieurs profilés.The document US-A-5,431,760 discloses a bag closure device comprising a control slider and two webs extending laterally on at least one side of an assembly of one or more profiles.

La Demanderesse a souhaité que les étapes de maintien, soudage et mise en place du dispositif de fermeture sur le film soit plus facile à réaliser que celle des procédés décrits dans les documents précités.The Applicant has desired that the steps of holding, welding and placing the closure device on the film is easier to achieve than that of the processes described in the aforementioned documents.

Ce but est atteint grâce à un procédé tel que défini en revendications 1 et 2 annexées.This object is achieved by a method as defined in appended claims 1 and 2.

Les voiles du dispositif de fermeture confèrent à l'invention un certain nombre d'avantages. Grâce à sa surface en coupe transverse plus grande, un dispositif pour la mise en oeuvre du procédé selon l'invention est aisément porté et positionné. De plus, les voiles peuvent être fixés à des températures suffisamment faibles pour éviter d'endommager les profilés.The sails of the closure device confer on the invention a certain number of advantages. Due to its larger cross-sectional area, a device for carrying out the method according to the invention is easily carried and positioned. In addition, the sails can be set at temperatures low enough to avoid damaging the profiles.

Ils permettent aussi que l'étape de fixation du dispositif de fermeture sur le film soit réalisée par soudage du film avec au moins une zone de ces voiles différente de celle située sous les profilés ce qui permet aussi d'éviter d'endommager les profilés lors de ce soudage.They also allow the fixing step of the closure device on the film to be performed by welding the film with at least one zone of these sails different from that under the profiles, which also makes it possible to avoid damaging the profiles during of this welding.

D'autres aspects, buts et avantages de l'invention apparaitront à la lecture de la description détaillée qui suit. L'invention sera aussi mieux comprise à l'aide des références aux dessins joints sur lesquels :

  • la figure 1 représente schématiquement, en coupe transversale trois exemples de dispositifs;
  • la figure 2 représente schématiquement, une vue en perpective d'un dispositif de fermeture et de moyens de soudage de ce dispositif sur un film destiné à former des sachets;
  • la figure 3 représente schématiquement, une vue en perspective de premiers et seconds moyens de soudage d'un dispositif de fermeture, situés respectivement en amont et en aval, d'un tube de remplissage d'une machine de formation de sachets;
  • la figure 3A représente schématiquement, une vue en perspective d'une variante de la machine de formation de sachets, selon l'invention, adaptée pour la fixation de dispositifs de fermeture munis d'un curseur de fermeture ;
  • la figure 4 est une vue en élévation de côté des seconds moyens de soudage d'un dispositif de fermeture, d'une machine de formation de sachets;
  • la figure 4A est une vue en élévation de côté des seconds moyens de soudage d'un dispositif de fermeture, d'une variante d'une machine de formation de sachets, selon l'invention, adaptés pour la fixation de dispositifs de fermeture munis d'un curseur de fermeture ;
  • la figure 5 est une coupe longitudinale de la goulotte de remplissage et des seconds moyens de soudage du dispositif de fermeture, selon le plan V,V, de la machine de formation de sachets représentée à la figure 4 ;
  • la figure 5A est une coupe transversale d'une variante des seconds moyens de soudage d'une machine de formation de sachets, selon l'invention, adaptée pour la fixation de dispositifs de fermeture munis d'un curseur de fermeture ;
  • la figure 6 est une coupe transversale d'un exemple de dispositif de fermeture;
  • la figure 7 représente schématiquement, en coupe transversale par rapport à la longueur du dispositif de fermeture représenté à la figure 6, des seconds moyens de soudage et des moyens de découpe, d'une machine de formation de sachets;
  • la figure 8 représente schématiquement une coupe transversale d'un autre exemple de dispositif de fermeture;
  • la figure 9 représente schématiquement, en coupe transversale, par rapport à la longueur du dispositif de fermeture représenté à la figure 8, des seconds moyens de soudage et des moyens de découpe d'une machine de formation de sachets;
  • la figure 10 représente une coupe transversale schématique d'un autre exemple de dispositif de fermeture;
  • la figure 11 représente schématiquement, en coupe transversale, un autre exemple de dispositif de fermeture;
  • la figure 12 représente schématiquement, une vue en élévation de face, d'un sachet muni d'un autre exemple de dispositif de fermeture;
  • la figure 13 représente schématiquement, en coupe transversale, un autre exemple du dispositif de fermeture;
  • la figure 14 représente schématiquement, en coupe transversale, le dispositif représenté à la figure 13 en configuration refermée ;
  • la figure 15 représente schématiquement, en coupe transversale, une autre variante du dispositif de fermeture;
  • la figure 16 représente schématiquement, en coupe transversale, le haut d'un sachet muni d'une autre variante d'un dispositif de fermeture;
  • la figure 17 représente schématiquement, en coupe transversale, une autre variante d'un dispositif de fermeture;
  • la figure 18 représente schématiquement, en coupe transversale, le dispositif de fermeture représenté à la figure 17 dans la configuration refermée ;
  • la figure 19 représente schématiquement, en coupe transversale, une autre variante d'un dispositif de fermeture;
  • la figure 20 représente schématiquement, en coupe transversale, le dispositif de fermeture représenté à la figure 19, en configuration refermée;
  • la figure 21 représente schématiquement, en coupe transversale, une variante de la fixation d'un dispositif de fermeture sur un film;
  • la figure 22 représente schématiquement, en coupe transversale, le haut d'un sachet avec un dispositif de fermeture fixé sur le sachet.
Other aspects, objects and advantages of the invention will appear on reading the detailed description which follows. The invention will also be better understood with reference to the accompanying drawings in which:
  • the figure 1 schematically shows in cross-section three examples of devices;
  • the figure 2 schematically shows a perspective view of a closure device and welding means of this device on a film for forming bags;
  • the figure 3 schematically shows a perspective view of first and second sealing means of a closure device, located respectively upstream and downstream, of a filling tube of a bag-forming machine;
  • the figure 3A schematically shows a perspective view of a variant of the bag-forming machine, according to the invention, adapted for fixing closure devices provided with a closing slider;
  • the figure 4 is a side elevational view of the second sealing means of a closure device, a bag-forming machine;
  • the Figure 4A is a side elevational view of the second sealing means of a closure device, a variant of a bag-forming machine, according to the invention, adapted for fixing closure devices provided with a slider closure;
  • the figure 5 is a longitudinal section of the filler neck and second sealing means of the closure device, according to the plane V, V, of the bag-forming machine shown in FIG. figure 4 ;
  • the Figure 5A is a cross-section of a variant of the second welding means of a bag-forming machine, according to the invention, adapted for fixing closure devices provided with a closing slider;
  • the figure 6 is a cross section of an example of a closure device;
  • the figure 7 represents schematically, in cross-section with respect to the length of the closure device shown in FIG. figure 6 second welding means and cutting means, a bag-forming machine;
  • the figure 8 schematically represents a cross-section of another example of a closure device;
  • the figure 9 represents schematically, in cross-section, with respect to the length of the closure device shown in FIG. figure 8 second welding means and cutting means of a bag-forming machine;
  • the figure 10 is a schematic cross section of another example of a closure device;
  • the figure 11 schematically shows, in cross-section, another example of a closure device;
  • the figure 12 schematically represents a front elevational view of a bag provided with another example of a closure device;
  • the figure 13 schematically shows, in cross section, another example of the closure device;
  • the figure 14 schematically represents, in cross-section, the device shown in FIG. figure 13 in closed configuration;
  • the figure 15 schematically shows, in cross-section, another variant of the closure device;
  • the figure 16 schematically represents, in cross-section, the top of a bag provided with another variant of a closure device;
  • the figure 17 schematically shows, in cross-section, another variant of a closure device;
  • the figure 18 schematically shows, in cross-section, the closure device shown in FIG. figure 17 in the closed configuration;
  • the figure 19 schematically shows, in cross-section, another variant of a closure device;
  • the figure 20 schematically shows, in cross-section, the closure device shown in FIG. figure 19 , in closed configuration;
  • the figure 21 schematically shows, in cross section, a variant of the fixing of a closure device on a film;
  • the figure 22 schematically represents, in cross section, the top of a bag with a closure device attached to the bag.

Sur la figure 1, sont représentés trois dispositifs 1 de fermeture Ces dispositifs 1 comprennent deux bandes 2, 4. Chaque bande 2, 4 comprend des voiles 6, 8 et des profilés 10, 12. Les profilés 10, 12 s'étendent longitudinalement sur les bandes 2, 4. Les profilés 10, 12 ont des formes aptes à coopérer l'une avec l'autre de manière complémentaire. Par exemple, l'un 10 des profilés, dit profilé mâle, a en coupe transversale, une forme en pointe de flèche, il peut être introduit et maintenu en prise dans le profilé 12, dit profilé femelle, en forme de gorge.On the figure 1 These devices 1 comprise two strips 2, 4. Each band 2, 4 comprises webs 6, 8 and sections 10, 12. The sections 10, 12 extend longitudinally on the strips 2, 4. The profiles 10, 12 have shapes capable of cooperating with each other in a complementary manner. For example, one of the profiles, said male section has a cross-section, a shape arrowhead, it can be introduced and maintained in engagement with the section 12, said female section, throat-shaped.

Chaque bande 2, 4 peut comporter plusieurs profilés 10, 12 similaires, par exemple, à ceux décrits ci-dessus. Ces profilés sont alors parallèles les uns aux autres.Each strip 2, 4 may comprise several profiles 10, 12 similar to, for example, those described above. These profiles are then parallel to each other.

Les bandes 2, 4 comportent respectivement un premier voile 6 et un deuxième voile 8 qui s'étendent largement latéralement sur un côté du ou des profilés 10, 12.The strips 2, 4 respectively comprise a first web 6 and a second web 8 which extend widely laterally on one side of the profile (s) 10, 12.

Selon certaines variantes, ce premier voile 6 et ce deuxième voile 8 peuvent être remplacés par une première 6 et une deuxième 8 parties d'un voile unique permettant de joindre les deux bandes 2,4.According to some variants, this first web 6 and this second web 8 may be replaced by a first 6 and a second 8 parts of a single web for joining the two bands 2,4.

Les dispositifs 1 de fermeture des figures 1a et 1b comprennent deux profilés 10, 12 complémentaires, chacun supporté par une des deux parties 6, 8 d'un voile unique, en forme de U en coupe transverse par rapport à la direction longitudinale des profilés 10, 12. Les profilés 10, 12 du dispositif 1 de fermeture de la figure 1a se trouvent à proximité du fond de la gorge du U. Les profilés 10, 12 du dispositif 1 de fermeture de la figure 1b se trouvent à proximité des extrémités libres des branches du U. Les voiles 6, 8 du dispositif 1 de fermeture de la figure 1c sont indépendants l'un de l'autre. Les profilés 10, 12 du dispositif 1 de fermeture de la figure 1c se trouvent à proximité d'un bord libre de voile 6, 8.The closing devices 1 Figures 1a and 1b comprise two complementary sections 10, 12, each supported by one of the two parts 6, 8 of a single U-shaped web in section transverse to the longitudinal direction of the profiles 10, 12. The profiles 10, 12 of the device 1 of closure of the figure 1a are close to the bottom of the groove of the U. The profiles 10, 12 of the closure device 1 of the figure 1b are near the free ends of the branches of the U. The sails 6, 8 of the closure device 1 of the figure 1c are independent of each other. The profiles 10, 12 of the closure device 1 of the figure 1c are close to a free sail edge 6, 8.

Ces dispositifs sont particulièrement adaptés pour être fixés sur le film 50 puisque la surface des voiles 6, 8 est telle qu'elle permet de réaliser un soudage de ces voiles 6, 8 sur le film 50 sur une zone de ceux-ci qui ne se trouve pas sous les profilés 10, 12. Ceci facilite la mise en place du dispositif de fermeture 1 et le soudage de celui-ci sur le film 50.These devices are particularly adapted to be fixed on the film 50 since the surface of the webs 6, 8 is such that it makes it possible to perform a welding of these webs 6, 8 on the film 50 on an area of these which does not not found under the profiles 10, 12. This facilitates the establishment of the closure device 1 and the welding thereof on the film 50.

Préférentiellement au moins un voile 6, 8 s'étend latéralement sur une zone au moins égale en surface à celle située sous les profilés 10, 12.Preferably at least one web 6, 8 extends laterally over an area at least equal in surface to that located under the profiles 10, 12.

Préférentiellement, le procédé selon l'invention est utilisé pour former des sachets 30 sur une machine FFS 100.Preferably, the method according to the invention is used to form sachets 30 on an FFS 100 machine.

Dans ce cas, au cours du procédé selon l'invention, l'étape de fixation du premier voile 6 sur un film 50 est réalisée en amont d'une goulotte de remplissage 130 de la machine FFS 100. Sur la figure 2, est représentée une partie du film 50 destiné à former des sachets 30. Le film 50 se déplace en direction de la goulotte 130 dans le sens indiqué par la flèche D.In this case, during the process according to the invention, the step of fixing the first web 6 on a film 50 is performed upstream of a filling chute 130 of the FFS machine 100. figure 2 , there is shown a portion of the film 50 for forming bags 30. The film 50 moves towards the chute 130 in the direction indicated by the arrow D.

Le film 50 comporte deux bords longitudinaux libres 52, 54, parallèles à sa direction de déplacement.The film 50 has two longitudinal free edges 52, 54, parallel to its direction of movement.

Transversalement par rapport à la direction de déplacement du film 50, est amené un dispositif 1 de fermeture. Ce dispositif 1 est orienté sur le film 50, de manière à ce que les profilés 10, 12 se trouvent globalement perpendiculaires aux bords longitudinaux 52, 54 du film 50.Crosswise with respect to the direction of movement of the film 50, is provided a closure device 1. This device 1 is oriented on the film 50, so that the sections 10, 12 are generally perpendicular to the longitudinal edges 52, 54 of the film 50.

Ce dispositif 1 peut être l'un des trois dispositifs 1 représentés à la figure 1 ou bien l'un de ceux présentés ci-dessous ou bien encore n'importe quel dispositif 1 adapté à la mise en oeuvre du procédé selon l'invention.This device 1 may be one of the three devices 1 represented in FIG. figure 1 or one of those presented below or any device 1 adapted to the implementation of the method according to the invention.

Préférentiellement, le dispositif 1 a une longueur approximativement égale à la moitié de la dimension du film 50, pris perpendiculairement à sa direction de déplacement D. Le dispositif 1 peut être placé à proximité de l'un des bords libres longitudinaux 52, 54. Préférentiellement, le dispositif 1 est fixé de manière approximativement centrée par rapport aux deux bords libres longitudinaux 52, 54. Un dispositif 1 est guidé, tiré ou poussé par des moyens à roulettes et/ou par un mécanisme de va et vient pour être positionné sur la surface du film 50. Le dispositif 1 est disposé sur le film 50, de manière à ce que l'une des deux bandes 2, 4 soit mise à plat sur une face du film 50, sur une portion du film 50 apte à former une première paroi de sachet 30. Sur la figure 2, c'est la bande 2 munie du voile 6 qui repose sur la surface du film 50.Preferably, the device 1 has a length approximately equal to half the size of the film 50, taken perpendicular to its direction of displacement D. The device 1 can be placed near one of the longitudinal free edges 52, 54. Preferably , the device 1 is fixed approximately centrally with respect to the two longitudinal free edges 52, 54. A device 1 is guided, pulled or pushed by roller means and / or by a reciprocating mechanism to be positioned on the film surface 50. The device 1 is arranged on the film 50, so that one of the two strips 2, 4 is laid flat on one side of the film 50, on a portion of the film 50 capable of forming a film. first wall of bag 30. On the figure 2 it is the web 2 provided with the web 6 which rests on the surface of the film 50.

Le dispositif 1 est avantageusement muni préalablement à son positionnement sur le film 50, de deux points de soudure 42, 44. Chacun est situé à une extrémité longitudinale 3, 5 des bandes 2, 4, plus précisément au niveau des profilés 10, 12, et contribue ainsi à assurer l'étanchéité du dispositif 1 de fermeture.The device 1 is advantageously provided, prior to its positioning on the film 50, with two weld spots 42, 44. Each is located at a longitudinal end 3, 5 of the strips 2, 4, more precisely at the level of the profiles 10, 12, and thus contributes to sealing the closure device 1.

Le dispositif 1 est placé sur le film 50 sous des premiers moyens de soudage transversaux 110. Ces premiers moyens de soudage transversaux 110 par exemple, comprennent une barre de soudage 112, transversale et deux barres longitudinales 114 par rapport à la direction de déplacement D du film 50. La longueur de la barre de soudage 112 est approximativement égale à celle du dispositif 1 à mettre en place et à fixer sur le film 50. Les deux barres de soudage 114 sont situées aux extrémités de la barre de soudage 112, perpendiculairement à celle-ci, et ont une longueur approximativement égale à la largeur du dispositif 1.The device 1 is placed on the film 50 under first transverse welding means 110. These first transverse welding means 110, for example, comprise a transverse welding bar 112 and two longitudinal bars 114 with respect to the direction of movement D of the film 50. The length of the welding bar 112 is approximately equal to that of the device 1 to set up and fix on the film 50. The two welding bars 114 are located at the ends of the welding bar 112, perpendicular to this, and have a length approximately equal to the width of the device 1.

Les barres de soudage 112, 114 sont alors abaissées et pressées sur le bord des voiles 6, 8 ensemble ou indépendamment l'une de l'autre.The welding bars 112, 114 are then lowered and pressed on the edge of the webs 6, 8 together or independently of one another.

Ainsi, selon une variante du procédé selon l'invention, l'étape de fixation du premier voile 6 sur le film 50 est réalisée seulement par les extrémités longitudinales 3, 5 des bandes 2, 4, grâce aux barres de soudage longitudinales 114. Selon une autre variante du procédé selon l'invention, la fixation du premier voile 6 sur le film 50 est réalisée grâce à la barre de soudage 112, seulement sur le bord du voile 6 destiné à être vers l'extérieur du sachet 30 par rapport aux profilés 10, 12, lorsque ce sachet 30 sera formé. Selon encore une autre variante du procédé selon l'invention, la fixation du premier voile 6, en amont de la goulotte, est réalisée en combinant les deux variantes précédentes,Thus, according to one variant of the method according to the invention, the step of fixing the first web 6 on the film 50 is carried out only by the longitudinal ends 3, 5 of the strips 2, 4, thanks to the longitudinal welding bars 114. According to another variant of the method according to the invention, the fixation of the first web 6 on the film 50 is carried out thanks to the welding bar 112, only on the edge of the web 6 intended to be towards the outside of the bag 30 with respect to sections 10, 12, when this bag 30 will be formed. According to yet another variant of the method according to the invention, the attachment of the first web 6, upstream of the chute, is achieved by combining the two previous variants,

Avantageusement, pour certains dispositifs 1 de fermeture, la fixation du premier voile 6 est réalisée en au moins deux points 47, 49 situés de part et d'autre du profilé 10 supporté par le voile 6, ce profilé étant considéré relativement à sa direction longitudinale. Le premier voile 6 est ainsi solidaire du film 50, en un point situé vers l'avant et en un point situé vers l'arrière, par rapport à la direction de déplacement D. Ceci permet d'éviter que le dispositif 1 ne se retourne au cours de la formation du sachet 30 sur la goulotte 130 (fig. 2 et fig. 21). Une machine conforme à la présente invention peut aussi permettre de réaliser cette variante du procédé selon l'invention.Advantageously, for some closure devices 1, the fixing of the first web 6 is performed at at least two points 47, 49 located on either side of the profile 10 supported by the web 6, this section being considered relative to its longitudinal direction . The first web 6 is thus integral with the film 50, at a point situated towards the front and at a point situated towards the rear, with respect to the direction of displacement D. This makes it possible to prevent the device 1 from turning around. during the formation of the bag 30 on the chute 130 ( Fig. 2 and Fig. 21 ). A machine according to the present invention can also make it possible to carry out this variant of the method according to the invention.

Avantageusement encore, la fixation du dispositif 1 de fermeture sur le film 50 peut être réalisée, avant formation du sachet 30, simultanément à la réalisation des points de soudure 42, 44. Dans ce cas, le dispositif 1 est acheminé sur le film 50 sans que les points de soudure 42, 44 n'aient été effectués. Puis, une fois le dispositif mis en place, des barres de soudage longitudinales 114 appropriées, soudent les extrémités longitudinales 3, 5 des bandes 2, 4 par la même opération que celle qui réalise les points de soudure 42, 44.Advantageously, the fixation of the closure device 1 on the film 50 can be performed, before formation of the bag 30, simultaneously with the production of the weld spots 42, 44. In this case, the device 1 is conveyed on the film 50 without that the weld points 42, 44 have been made. Then, once the device is put in place, suitable longitudinal welding bars 114 weld the longitudinal ends 3, 5 of the strips 2, 4 by the same operation as that which produces the soldering points 42, 44.

Sur la figure 3, est représentée la formation d'un sachet 30 à partir du film 50, autour de la goulotte 130. Le film 50 muni du dispositif 1 est acheminé vers la goulotte 130. Il est ensuite enveloppé autour de cette goulotte 130. Les bords libres longitudinaux 52, 54 sont ramenés l'un sur l'autre, parallèlement à l'axe de la goulotte 130, pour être soudés l'un sur l'autre grâce à des moyens de soudage longitudinaux 120 aptes à former une soudure longitudinale 40. En repliant ainsi le film 50, longitudinalement par rapport à sa direction de déplacement, on forme une seconde paroi 34 de sachet 30.On the figure 3 , is shown the formation of a bag 30 from the film 50, around the chute 130. The film 50 provided with the device 1 is fed to the chute 130. It is then wrapped around this chute 130. The longitudinal free edges 52, 54 are brought back to one another, parallel to the axis of the chute 130, to be welded to one another by means of longitudinal welding means 120 capable of forming a longitudinal weld 40. thus folding the film 50, longitudinally with respect to its direction of displacement, a second wall 34 of the bag 30 is formed.

Un sachet 30 a deux plis longitudinaux 31 , 33, une ouverture close par le dispositif 1, et est fermé hermétiquement par la soudure longitudinale 40 et une soudure transversale 46. La soudure transversale 46 s'étend entre les plis longitudinaux 31, 33 et est située sur le bord des parois 32, 34 opposées longitudinalement au dispositif 1.A bag 30 has two longitudinal folds 31, 33, an opening closed by the device 1, and is hermetically sealed by the longitudinal weld 40 and a transverse weld 46. The transverse weld 46 extends between the longitudinal folds 31, 33 and is located on the edge of the walls 32, 34 opposite longitudinally to the device 1.

Sur la figure 4, sont représentés des seconds moyens de soudage transversaux 116. Ces seconds moyens de soudage transversaux 116 sont adaptés pour fixer le second voile 6 du dispositif 1 à la seconde paroi 34 de sachets 30 en aval de la goulotte 130.On the figure 4 , are represented second transverse welding means 116. These second transverse welding means 116 are adapted to fix the second web 6 of the device 1 to the second wall 34 of bags 30 downstream of the chute 130.

Comme représentés à la figure 5, les seconds moyens de soudage transversaux 116 permettent à la fois de souder le dispositif 1 aux parois 32, 34 et de former la soudure transversale 46. Préférentiellement, des moyens de découpe 140 sont montés solidairement des seconds moyens de soudage transversaux 116, afin de procéder à la découpe des sachets 30 successifs. Ces moyens de découpe 140 sont aptes à former une découpe transversale par rapport au déplacement du film 50.As represented in figure 5 , the second transverse welding means 116 make it possible both to weld the device 1 to the walls 32, 34 and to form the transverse weld 46. Preferably, the cutting means 140 are integrally mounted to the second transverse welding means 116, in order to proceed to the cutting of the successive bags 30. These cutting means 140 are able to form a transverse cut with respect to the displacement of the film 50.

Préférentiellement aussi, les seconds moyens de soudage transversaux 116 sont munis chacun d'une rainure 117. Cette rainure 117 s'étend sur toute la longueur des seconds moyens de soudage transversaux 116. Les rainures 117 de chacun des seconds moyens de soudage 116 sont en vis à vis et sont tournées l'une vers l'autre pour former une cavité. Ces rainures 117 permettent de ne pas souder entre elles les parois 32, 34 sur une petite zone transversale, en aval du dispositif de fermeture. Cette zone transversale permet de former des languettes 36, 38 permettant la préhension des parois 32, 34 afin de les écarter et d'ouvrir le sachet 30.Also preferably, the second transverse welding means 116 are each provided with a groove 117. This groove 117 extends over the entire length of the second transverse welding means 116. The grooves 117 of each of the second welding means 116 are in contact with each other. face to face and are turned towards each other to form a cavity. These grooves 117 make it possible not to weld between them the walls 32, 34 on a small transverse zone, downstream of the closure device. This transverse zone makes it possible to form tongues 36, 38 making it possible to grip the walls 32, 34 so as to spread them and to open the bag 30.

Ci-dessous vont être décrites encore plusieurs variantes du dispositif 1 pour la mise en oeuvre du procédé selon l'invention.Below will be described further several variants of the device 1 for carrying out the method according to the invention.

Le dispositif de fermeture 1 pour la mise en oeuvre du procédé selon l'invention comporte un curseur de fermeture 9. Ce curseur de fermeture 9 peut être de n'importe quel type connu et apte à mettre les profilés 10, 12 en prise l'un avec l'autre dans un premier sens et à les désengager l'un de l'autre lorsqu'il est déplacé dans un deuxième sens opposé au premier. Pour la fixation de dispositifs de fermeture 1 munis de curseur de fermeture 9, le procédé de fabrication de films 50 selon l'invention doit être adapté. En particulier, comme représenté à la figure 3A, il comprend une étape consistant à acheminer en amont de la goulotte 130 un film 50 muni de premières découpes 51. Les premières découpes 51 sont aptes à permettre un accès aisé au curseur de fermeture 9 sur toute la longueur des profilés 10, 12. Par exemple, elles sont d'une forme et de dimensions légèrement inférieures à celles du dispositif de fermeture 1. Ces premières découpes 51 sont espacées l'une de l'autre sur le film 50 d'une distance égale à la dimension d'un sachet 30 dans la direction parallèle au déplacement D du film 50. Le procédé selon l'invention comprend alors une étape consistant à positionner un dispositif de fermeture 1 au niveau de chacune des premières découpes 51, en amont de la goulotte de remplissage 130.The closure device 1 for implementing the method according to the invention comprises a closing slider 9. This closing slider 9 can be of any known type and suitable for putting the profiles 10, 12 into engagement with each other in a first direction and disengaging them from each other when moved in a second opposite direction to the first. For fastening closure devices 1 provided with closure slider 9, the film manufacturing method 50 according to the invention must be adapted. In particular, as shown in figure 3A , it comprises a step consisting in conveying a film 50 provided with first cut-outs 51 upstream of the chute 130. The first cut-outs 51 are able to allow easy access to the closing slider 9 over the entire length of the profiles 10, 12. For example, they are of a shape and dimensions that are slightly smaller than those of the closure device 1. These first cuts 51 are spaced apart from one another on the film 50 by a distance equal to the size of a bag. In the direction parallel to the displacement D of the film 50. The method according to the invention then comprises a step of positioning a closure device 1 at each of the first cutouts 51, upstream of the filler neck 130.

Le dispositif de fermeture 1 est déjà muni du curseur de fermeture 9 et les extrémités longitudinales 3, 5 sont éventuellement déjà soudées ensemble grâce à des points de soudure 42, 44.The closure device 1 is already provided with the closing slider 9 and the longitudinal ends 3, 5 are possibly already welded together by welding points 42, 44.

Le dispositif de fermeture 1 est ainsi positionné de manière à ce que le curseur de fermeture 9 soit sur le bord longitudinal du dispositif de fermeture 1, situé vers l'avant en prenant pour référence le sens de déplacement D du film 50. Au moins l'un des voiles 6, 8 est ensuite soudé sur le film 50 au niveau d'au moins un bord des premières découpes 51, grâce aux premiers moyens de soudage transversaux 110. Le film 50 ainsi muni de dispositifs de fermeture 1 est conformé en tube, autour de la goulotte 130. Une soudure longitudinale 40 est formée grâce aux moyens de soudage longitudinaux 120. Une deuxième découpe 53 est réalisée en aval des moyens de soudage longitudinaux 120. Cette deuxième découpe 53 est effectuée dans le film 50, en vis à vis de la première découpe 51. Cette deuxième découpe 53 a une forme et une dimension équivalentes à celles des premières découpes 51. Les deuxièmes découpes 53 sont réalisées au moyen d'une lame 135. Si cette lame 135 est située au niveau de la goulotte 130, elle est incurvée. Le soudage du dispositif de fermeture 1 est ensuite achevé grâce aux seconds moyens de soudage transversaux 116. La forme de ces seconds moyens de soudage transversaux 116 est adaptée pour souder des dispositifs de fermeture 1 munis de curseurs de fermeture 9.The closure device 1 is thus positioned so that the closing slider 9 is on the longitudinal edge of the closure device 1, located forwards, taking for reference the direction of movement D of the film 50. At least 1 one of the webs 6, 8 is then welded to the film 50 at at least one edge of the first cutouts 51, by virtue of the first transverse welding means 110. The film 50 thus provided with closure devices 1 is shaped as a tube around the chute 130. A longitudinal weld 40 is formed by the longitudinal welding means 120. A second cut 53 is made downstream of the longitudinal welding means 120. This second cutout 53 is made in the film 50, opposite the first cut 51. This second cut 53 has a shape and a dimension equivalent to those of the first cuts 51. The second cuts 53 are made by means of a blade 135. If this blade 135 is located at the chute 130, it is curved. The welding of the closure device 1 is then completed by the second transverse welding means 116. The shape of these second transverse welding means 116 is adapted for welding closure devices 1 provided with closing sliders 9.

Des exemples de tels moyens de soudage transversaux 116 sont illustrés par les figures 4A et 5A.Examples of such transverse welding means 116 are illustrated by the Figures 4A and 5A .

Sur la figure 4A, les seconds moyens de soudage transversaux comprennent une ouverture 118. Cette ouverture 118 est parallèle aux profités 10, 12 et de longueur approximativement égale à celle de ces profilés 10, 12. La largeur de cette ouverture est suffisante pour que les barres de soudage des seconds moyens de soudage 116 ne soient pas appliquées sur le curseur de fermeture 9 lors du soudage du dispositif de fermeture 1 sur le film 50. Les moyens de soudage 116 ne soudent ainsi sur le film 50 que les voiles 6, 8 du dispositif de fermeture 1, avec éventuellement les extrémités longitudinales 3, 5 des bandes 2, 4. Les seconds moyens de soudage 116 forment ainsi les soudures transversales 46 et 48 du sachet 30.On the Figure 4A , the second transverse welding means comprise an opening 118. This opening 118 is parallel to the benefits 10, 12 and of length approximately equal to that of these profiles 10, 12. The width of this opening is sufficient for the welding rods second welding means 116 are not applied to the closing slider 9 during the welding of the closure device 1 on the film 50. The welding means 116 thus weld on the film 50 only the sails 6, 8 of the closing device 1, possibly with the longitudinal ends 3, 5 of the strips 2, 4. The second welding means 116 thus form the transverse seals 46 and 48 of the bag 30.

Sur la figure 5A, selon une autre variante des seconds moyens de soudage transversaux 116, ceux-ci ont une forme en U en coupe transverse. Cette forme ménage des rainures 117 formant une cavité qui est apte à recevoir les profilés 10, 12 et le curseur de fermeture 9, sans les déformer lorsque les barres de soudage des seconds moyens de soudage 116 sont pressées l'une contre l'autre pour former les soudures transversales 46 et 48. Eventuellement, des bandes de soudure pelables 18, 20 sont disposées entre les voiles 6, 8 du côté de ces voiles 6, 8 destiné à être vers l'intérieur du sachet 30.On the Figure 5A , according to another variant of the second transverse welding means 116, these have a U-shape in transverse section. This form provides grooves 117 forming a cavity which is adapted to receive the profiles 10, 12 and the closing slider 9, without deforming them when the welding bars of the second welding means 116 are pressed against each other for form the transverse welds 46 and 48. Optionally, peelable welding strips 18, 20 are arranged between the webs 6, 8 on the side of these webs 6, 8 intended to be towards the inside of the bag 30.

D'autres méthodes peuvent être envisagées pour fixer un dispositif de fermeture 1 à curseur de fermeture 9 sur un film 50. En particulier, il est possible de dégager l'accès au curseur de fermeture 9, en réalisant les découpes 51, 53 d'autres façons que celles décrites ci-dessus.Other methods can be envisaged for fixing a closure device 1 with a closing slider 9 on a film 50. In particular, it is possible to clear the access to the closing slider 9, by making the cutouts 51, 53 of FIG. other ways than those described above.

Il peut aussi être envisagé que la goulotte 130 soit munie d'une rainure longitudinale apte à guider les curseurs de fermeture 9 lors du passage des dispositifs de fermeture 1 sur cette goulotte 130. La figure 6 représente un dispositif 1 de fermeture muni, outre ses voiles 6, 8 et ses profilés 10, 12, de deux bandes 18, 20 aptes à former une soudure pelable. Ces bandes de soudure pelable 18, 20 s'étendent sur toute la longueur du dispositif 1, aux bords des extrémités libres des voiles 6, 8. Cette soudure pelable 18, 20 joint donc les voiles 6, 8, ou parties de voiles, du côté qui sera situé vers l'extérieur du sachet 30 par rapport aux profilés 10, 12, après formation complète de ce sachet.It can also be envisaged that the chute 130 is provided with a longitudinal groove capable of guiding the closing sliders 9 during the passage of the closure devices 1 on this chute 130. figure 6 represents a closing device 1 provided, in addition to its webs 6, 8 and its sections 10, 12, of two strips 18, 20 able to form a peelable weld. These strips of peelable weld 18, 20 extend over the entire length of the device 1, at the edges of the free ends of the webs 6, 8. This peelable weld 18, 20 therefore joins the sails 6, 8, or parts of the sails, the side that will be located towards the outside of the bag 30 relative to the profiles 10, 12, after complete formation of this bag.

La figure 7a illustre, au niveau des seconds moyens de soudage transversaux 116, le positionnement et le soudage du dispositif 1 sur les parois 32, 34. Le dispositif de la figure 6 y est représenté en configuration refermée. Les bandes de soudure pelable 18, 20 sont présoudées l'une à l'autre. Le bord libre de l'un 6 des voiles 6, 8 du dispositif 1 est fixé à la paroi 34 grâce aux premiers moyens de soudage 110. Eventuellement, selon une variante du procédé selon l'invention, les bandes de soudure pelable 18, 20 ne sont pas présoudées et sont alors soudées entre elles et sur la paroi 34 au cours de l'opération de fixation du voile 6 sur cette paroi 34 par les premiers moyens de soudage 110. Selon encore une autre variante du procédé selon l'invention, l'ensemble des parois 32, 34, des voiles 6, 8 et des bandes de soudure pelable 18, 20 est soudé par les seconds moyens de soudage transversaux 116. Après que la paroi 32 ait été rapprochée du bord libre de l'autre 8 des voiles 6, 8, il est procédé à l'achèvement de la fixation du dispositif 1 sur les parois 32, 34, simultanément à la formation de la soudure 46 et à la découpe des parois 32, 34, entre la soudure 46 d'un sachet et le dispositif de fermeture 1 du sachet suivant (fig. 7b). Comme décrit précédemment, la rainure 117 des seconds moyens de soudage transversaux 116 permet de conserver deux zones des parois 32, 34 non soudées, afin de constituer des languettes 36, 38 du côté des profilés 10, 12 situé vers l'extérieur du sachet 30.The figure 7a illustrates, at the second transverse welding means 116, the positioning and welding of the device 1 on the walls 32, 34. The device of the figure 6 is represented in closed configuration. The peelable seal strips 18, 20 are presolded to one another. The free edge of one of the webs 6, 8 of the device 1 is fixed to the wall 34 by means of the first welding means 110. Optionally, according to a variant of the method according to the invention, the peelable solder strips 18, 20 are not presolded and are then welded together and on the wall 34 during the operation of fixing the web 6 on this wall 34 by the first welding means 110. According to yet another variant of the method according to the invention, all the walls 32, 34, webs 6, 8 and strips of peelable weld 18, 20 is welded by the second transverse welding means 116. After the wall 32 has the sails 6, 8 are brought closer to the free edge of the other 8, the fixing of the device 1 on the walls 32, 34 is completed, simultaneously with the formation of the weld 46 and the cutting of the walls 32, 34, between the solder 46 of a bag and the closure device 1 of the next bag ( Fig. 7b ). As previously described, the groove 117 of the second transverse welding means 116 makes it possible to keep two zones of the unsealed walls 32, 34 in order to form tabs 36, 38 on the side of the sections 10, 12 located towards the outside of the bag 30. .

Sur la figure 8 est représenté un dispositif de fermeture muni de deux bandes de protection 14, 16. Ces bandes de protection 14, 16 s'étendent sur toute la longueur des bords libres longitudinaux des voiles 6, 8. Ces bandes de protection sont munies d'une couche barrière sur leurs faces amenées à être en vis à vis, qui permet aux bandes de protection de ne pas se souder entre elles. Comme schématisé sur la figure 9, le dispositif 1 est soudé aux parois 32, 34 avec des seconds moyens de soudage transversaux 116, non munis de rainures 117. Sur la figure 9b, on remarque que les parois 32, 34 sont soudées sur le dispositif 1 à la fois au niveau des bandes de soudure pelable 18, 20 et au niveau des bandes de protection 14, 16. Mais les bandes de protection 14, 16 ne sont pas soudées entre elles. On dispose ainsi de languettes 36, 38 aptes à la préhension des parois 32, 34 du sachet 30 afin de procéder à l'ouverture de ce dernier.On the figure 8 is shown a closure device provided with two protective strips 14, 16. These protective strips 14, 16 extend over the entire length of the longitudinal free edges of the webs 6, 8. These protective strips are provided with a layer barrier on their faces brought to be opposite, which allows the protective strips not to weld together. As schematized on the figure 9 , the device 1 is welded to the walls 32, 34 with second transverse welding means 116, not provided with grooves 117. On the figure 9b it will be noted that the walls 32, 34 are welded to the device 1 at the same time at the level of the peelable sealing strips 18, 20 and at the level of the protective strips 14, 16. But the protection strips 14, 16 are not welded together. There are thus tabs 36, 38 adapted to grip the walls 32, 34 of the bag 30 to proceed to the opening of the latter.

La figure 10 représente schématiquement un dispositif de fermeture 1, muni d'une ligne de perforations 22. Cette ligne de perforations 22 se trouve, lorsque le dispositif 1 est en position ouverte entre les profilés 10 et 12, à approximativement égale distance de chacun. Cette ligne de perforations 22 s'étend sur toute la longueur du dispositif 1 au fond de la gorge en U formée par celui-ci, quand il est en configuration refermée. Après avoir ouvert le sachet 30, en séparant les bandes de soudure pelable 18, 20 et les profilés complémentaires 10, 12, on déchire le dispositif 1 au niveau de la ligne de perforations 22.The figure 10 schematically represents a closure device 1, provided with a line of perforations 22. This line of perforations 22 is, when the device 1 is in the open position between the profiles 10 and 12, approximately equal distance from each. This line of perforations 22 extends over the entire length of the device 1 at the bottom of the U-shaped groove formed by it, when it is in closed configuration. After opening the bag 30, separating the strips of peelable solder 18, 20 and the complementary profiles 10, 12, the device 1 is torn at the level of the perforation line 22.

La figure 11 représente une variante du dispositif 1 présenté à la figure 10. Selon cette variante, un voile 7 mince forme la gorge du U entre les profilés 10, 12. Ce voile 7 mince peut aisément être déchiré pour ouvrir le sachet 30 mais il offre, tant qu'il est intact, un moyen pour assurer une étanchéité supplémentaire au dispositif 1 de fermeture. Si ce voile 7 s'étend suffisamment, il peut se retourner vers et entre les voiles 6, 8 lorsque le contenu du sachet 30 est versé, pour protéger les profilés 10, 12 du contenu du sachet 30. Les profilés 10, 12 ainsi protégés restent propres et aptes à coopérer efficacement l'un avec l'autre, lorsque l'on souhaite refermer le sachet 30.The figure 11 represents a variant of the device 1 presented to the figure 10 . According to this variant, a thin web 7 forms the groove of the U between the sections 10, 12. This thin web 7 can easily be torn to open the bag 30 but it offers, as long as it is intact, a means for sealing additional device 1 closure. If this web 7 extends sufficiently, it can turn towards and between the webs 6, 8 when the contents of the bag 30 is poured, to protect the sections 10, 12 of the contents of the bag 30. The sections 10, 12 thus protected remain clean and able to cooperate effectively with each other, when it is desired to close the bag 30.

Ce voile 7 peut aussi former un entonnoir ou un bec verseur, lorsqu'il est tiré vers l'extérieur du sachet 30 (fig. 12).This veil 7 can also form a funnel or pouring spout when it is pulled out of the bag 30 ( Fig. 12 ).

Pour former un bec verseur par exemple, le voile 7 est constitué de deux éléments grossièrement trapézoïdaux disposés l'un sur l'autre et liés entre eux sur les deux bords non parallèles des trapèzes et sur le bord le plus court des deux bords parallèles. La longueur de celui des deux bords parallèles du trapèze qui est le plus long, est égal à la dimension du sachet 30 transversalement par rapport à la direction de déplacement D du film 50. Ces deux bords non parallèles sont soudés entre et avec les extrémités longitudinales 3, 5 en vis à vis des bandes 2, 4.To form a spout for example, the web 7 consists of two roughly trapezoidal elements arranged one on the other and linked together on the two non-parallel edges of the trapeziums and on the short edge of the two parallel edges. The length of the one of the two parallel edges of the trapezium which is the longest, is equal to the dimension of the bag 30 transversely with respect to the direction of displacement D of the film 50. These two nonparallel edges are welded between and with the longitudinal ends 3, 5 with respect to the strips 2, 4.

Sur la figure 13, est représenté un dispositif 1 de fermeture comprenant outre des bandes de soudure pelable 18, 20, les profilés complémentaires 10, 12 et les voiles 6, 8, une membrane d'étanchéité 26. Cette membrane 26 est soudée sur toute la longueur du dispositif 1, par exemple à proximité de la soudure pelable 18, entre cette bande de soudure pelable 18 et le profilé 10. Cette membrane d'étanchéité 26 s'étend latéralement en direction de l'autre profilé 12 en venant recouvrir le profilé 10.On the figure 13 , there is shown a closure device 1 further comprising strips of peelable weld 18, 20, the complementary profiles 10, 12 and the webs 6, 8, a sealing membrane 26. This membrane 26 is welded over the entire length of the device 1, for example near the peelable seal 18, between this peelable solder strip 18 and the profile 10. This sealing membrane 26 extends laterally towards the other section 12 by covering the section 10.

La figure 14 montre le dispositif 1 représenté à la figure 13 en position refermée. On voit alors que la membrane d'étanchéité 26 est prise entre les profilés 10 et 12.The figure 14 shows the device 1 shown in figure 13 in closed position. We then see that the sealing membrane 26 is taken between the sections 10 and 12.

La figure 15 représente un dispositif analogue à celui des figures 13 et 14, à la différence qu'il comporte deux membranes d'étanchéité 26 soudées chacune à l'un des voiles 6, 8.The figure 15 represents a device similar to that of Figures 13 and 14 , with the difference that it comprises two sealing membranes 26 each welded to one of the webs 6, 8.

Les figures 16 à 20 représentent des variantes d'un dispositif 1 de fermeture comprenant au moins une bande de soudure pelable 18, 20, 21 et une ligne de perforations 19.The Figures 16 to 20 represent variants of a closure device 1 comprising at least one peelable solder strip 18, 20, 21 and a line of perforations 19.

Sur la figure 16 est représenté un dispositif 1 qui présente une bande de soudure pelable 21 unique fixée entre les voiles 6 et 8. la ligne de perforations 19 se trouve sur le bord de la bande de soudure pelable 21 situé vers l'extérieur du sachet 30 et entre les voiles 6 et 8 . Cette ligne de perforations s'étend sur toute la longueur du dispositif 1. Elle permet de déchirer la soudure pelable plus aisément lorsque l'on écarte les parois 32 et 34 pour ouvrir le sachet 30.On the figure 16 there is shown a device 1 which has a single peelable solder strip 21 fixed between the webs 6 and 8. the line of perforations 19 is on the edge of the peelable solder strip 21 located towards the outside of the bag 30 and between the sails 6 and 8. This line of perforations extends over the entire length of the device 1. It makes it possible to tear the peelable weld more easily when the walls 32 and 34 are moved apart to open the bag 30.

La figure 17 représente un dispositif 1 dans la configuration ouverte. La ligne de perforations 19 se situe entre les profilés 10 et 12, à approximativement égale distance de chacun d'eux, à la jointure des voiles 6 et 8. Des bandes de soudure pelable 18, 20 longent cette ligne de perforations 19 sur toute la longueur du dispositif 1 de fermeture.The figure 17 represents a device 1 in the open configuration. The perforation line 19 is located between the sections 10 and 12, approximately equal distance from each of them, at the joint of the webs 6 and 8. Strips of peelable weld 18, 20 along this line of perforations 19 over the entire length of the closing device 1.

La figure 18 représente, en position refermée, le dispositif 1 de la figure 17 fixé sur un sachet 30. Pour ouvrir le sachet 30, on écarte ses parois 32, 34, ce qui induit une contrainte entre les voiles 6 et 8 et provoque la déchirure de la ligne de perforations 19. Ce sachet 30 pourra éventuellement être refermé en pressant l'une sur l'autre les bandes de soudure pelable 18 et 20, si ce sont par exemple des bandes adhésives. Ceci assure alors une étanchéité plus grande qu'avec la seule coopération des profilés 10, 12 l'un avec l'autre.The figure 18 represents, in the closed position, the device 1 of the figure 17 fixed to a bag 30. To open the bag 30, its walls 32, 34 are spread, which induces a stress between the webs 6 and 8 and causes the tearing of the line of perforations 19. This bag 30 may optionally be closed again. pressing on one another the strips of peelable weld 18 and 20, if they are for example adhesive strips. This then ensures a greater seal than with the only cooperation of the profiles 10, 12 with each other.

Les figures 19 et 20 représentent un dispositif de fermeture tel que celui représenté aux figures 17 et 18, comprenant en outre une membrane d'étanchéité 26. Cette membrane d'étanchéité 26 est soudée sur le voile 8, à proximité de la bande de soudure pelable 20 et s'étend latéralement au dessus du profilé 12.The Figures 19 and 20 represent a closing device such as that shown in Figures 17 and 18 , further comprising a sealing membrane 26. This sealing membrane 26 is welded to the web 8, close to the peelable welding strip 20 and extends laterally above the section 12.

La figure 21 représente un dispositif de fermeture fixé sur un film 50 (par exemple avant passage sur la goulotte de remplissage 130 d'une machine FFS). Ce dispositif 1 est constitué de deux voiles 6, 8 réunis entre eux pour former un U. Le voile 6 est fixé au film 50 par deux points de soudage 47, 49, situés sur le voile 6 de part et d'autre de la direction longitudinale du profilé 10. Ces points de soudage 47, 49 peuvent être réalisés avant repliement du dispositif 1 sur lui-même pour faire coopérer les profilés 10, 12 entre eux. Les points de soudage 47, 49 peuvent être plus ou moins étendus dans la direction longitudinale des bandes 2, 4. Ils peuvent éventuellement aussi s'étendre sur toute la longueur du dispositif 1. Selon une autre variante, le dispositif 1 ne peut être retenu au film 50 que par un seul 49 de ces points de soudage 47, 49. Préférentiellement, dans ce cas le point 49 est celui situé en aval par rapport au déplacement D du film 50, de manière à éviter un retournement du dispositif 1 au passage sur la goulotte de remplissage 130.The figure 21 represents a closure device attached to a film 50 (for example before passing over the filling chute 130 of an FFS machine). This device 1 consists of two webs 6, 8 joined together to form a U. The sail 6 is fixed to the film 50 by two welding points 47, 49, located on the web 6 on either side of the direction longitudinal of the profile 10. These welding points 47, 49 may be made before folding the device 1 on itself to cooperate the sections 10, 12 between them. The welding points 47, 49 may be more or less extended in the longitudinal direction of the strips 2, 4. They may also extend over the entire length of the device 1. According to another variant, the device 1 can not be retained to the film 50 only by a single 49 of these welding points 47, 49. Preferably, in this case the point 49 is the one situated downstream with respect to the displacement D of the film 50, so as to avoid a reversal of the device 1 to the passage on the filler neck 130.

Avantageusement, un de ces points de soudage 47, 49 est situé du côté des profilés 10, 12 qui se trouvera à l'intérieur du sachet 30 une fois celui-ci formé. Dans ce cas, on ne réalisera pas de point de soudage équivalent en vis à vis, sur le deuxième voile 8. De cette manière, on constitue une configuration en charnière qui offre une meilleure résistance à une pression interne au sachet 30 (figure 22).Advantageously, one of these welding points 47, 49 is located on the side of the profiles 10, 12 which will be inside the bag 30 once it formed. In this case, no equivalent welding point will be made opposite, on the second web 8. In this way, a hinge configuration is formed which offers a better resistance to an internal pressure of the bag 30 (FIG. figure 22 ).

On comprendra que l'invention s'étend aussi à une machine de fabrication d'un film 50 destiné à former des sachets 30, comprenant des premiers moyens de soudage 110 transversaux, par rapport à la direction de déplacement du film 50, aptes à fixer un dispositif 1 de fermeture muni de voiles 6, 8 sur le film 50.It will be understood that the invention also extends to a machine for manufacturing a film 50 for forming bags 30, comprising first transverse welding means 110, with respect to the direction of movement of the film 50, capable of fixing a closing device 1 provided with webs 6, 8 on the film 50.

On obtient ainsi un film 50 pour la formation de sachets 30 muni de dispositifs de fermeture 1. Eventuellement, les dispositifs de fermeture 1 ne sont fixés au film 50 que par un premier voile 6. Des sachets 30 peuvent être alors conformés et achevés à partir de ce film 50 muni de dispositifs de fermeture 1, soit sur une machine de formation de sachets 30 pour être utilisés et remplis ultérieurement, soit sur une machine FFS.This produces a film 50 for the formation of bags 30 provided with closure devices 1. Optionally, the closure devices 1 are fixed to the film 50 only by a first web 6. Bags 30 can then be shaped and completed from of this film 50 provided with closure devices 1, either on a bag-forming machine 30 to be used and subsequently filled, or on an FFS machine.

L'invention s'étend donc aussi à une machine de formation, remplissage et fermetures automatiques, qui comprend des premiers moyens de soudage 110, transversaux, en amont d'une goulotte 130 de remplissage et de seconds moyens de soudage 116 transversaux en aval de la goulotte 130. La notion de transversalité étant ici entendu en référence à la direction de déplacement du film 50.The invention therefore also extends to a machine for forming, filling and automatic closing, which comprises first transverse welding means 110, upstream of a filler chute 130 and second transverse welding means 116 downstream of the trough 130. The notion of transversality being here understood with reference to the direction of movement of the film 50.

Claims (25)

  1. Method of manufacturing bags (30) comprising the steps consisting in moving a continuous film (50) and in attaching to the film (50) sequentially and transversely relative to the direction of movement (D) of the latter, a sealing device (1) comprising a first tape (2) supporting at least one sealing strip (10), engaged with another sealing strip (12) that matches it and is supported by a second tape (4) or a part of the first tape (2), that will be attached to the film (50) later, each tape (2, 4) comprising at least one web (6, 8) extending laterally on one side of the strip(s) (10, 12) supported by each tape (2, 4), characterized in that the sealing device (1) comprises a control cursor (9), and that it comprises the making of cut-outs (51, 53) on the film (50) in order to make way for the sealing cursor (9).
  2. Method of manufacturing bags (30), comprising the steps consisting in moving a continuous film (50) and in attaching to the film (50) sequentially and transversely relative to the direction of movement (D) of the latter, a sealing device (1) comprising a first tape (2) supporting at least one sealing strip (10), engaged with another sealing strip (12) that matches it and is supported by a second tape (4), or a part of the first tape (2), that will be attached to the film (50) later, each tape (2, 4) comprising at least one web (6, 8) extending laterally on one side of the strip(s) (10, 12) supported by each tape (2, 4), characterized in that the sealing device (1) comprises a control cursor (9), and that it comprises a step of guiding the cursor (9) in a longitudinal groove of a bag forming and filling spout (130).
  3. Method according to one of Claims 1 or 2, characterized in that the attachment step is carried out by heat-sealing the film (50) with at least one zone of the webs (6, 8) different from the zone situated beneath the strips (10, 12).
  4. Method according to one of Claims 1 to 3, characterized in that at least one web (6, 8) extends laterally over a zone at least equal in surface area to that situated beneath the strips (10, 12).
  5. Method according to one of the preceding claims, characterized in that it comprises the formation of bags (30) on an automatic forming, filling and sealing machine.
  6. Method according to one of the preceding claims, characterized in that it comprises the attachment, to the film (50), of a sealing device (1) comprising two matching strips (10, 12), each supported by one of the two facing parts (6, 8) from a single web in the form of a "U", in cross section relative to the longitudinal direction of the strips (10, 12).
  7. Method according to Claim 6, characterized in that it comprises the attachment, to the film (50), of a sealing device (1) furnished with a line of perforations (19, 22) between the strips (10, 12) and equidistant from each of them.
  8. Method according to one of Claims 5 to 7, characterized in that a step for attaching a first web (6) to the film (50) is carried out upstream of a filling spout (130) of the automatic forming, filling and sealing machine.
  9. Method according to one of Claims 5 to 8, characterized in that a step of attaching a second web (8) to a second wall (34) of a bag (30) is carried out downstream of a filling spout (130) of the automatic forming, filling and sealing machine.
  10. Method according to one of the preceding claims, characterized in that it comprises the attachment of the sealing device (1) so that the strips (10, 12) are perpendicular to the longitudinal edges (52, 54) of the film (50).
  11. Method according to Claim 10, characterized in that it comprises the attachment of the sealing device (1) in a centred manner relative to the longitudinal edges (52, 54) of the film (50).
  12. Method according to one of the preceding claims, characterized in that the attachment of the first web (6) to the film (50) is carried out by longitudinal ends (3, 5) of the tapes (2, 4).
  13. Method according to one of the preceding claims, characterized in that it comprises the attachment to the film (50) of a sealing device (1) which comprises a sealing membrane (26) held between the strips (10, 12).
  14. Method according to one of Claims 1 to 11 and 13, characterized in that the attachment of the first web (6) to the film is carried out on the edge of the web (6) intended to be towards the outside of the bag (30) relative to the strips (10, 12).
  15. Method characterized in that it complies with Claims 12 and 14 taken in combination.
  16. Method according to one of Claims 1 to 11 and 13, characterized in that the step of attaching the first web (6) to the film (50) is carried out at a single point (49) situated on the side of the strips (10, 12) that will be inside the bag (30), once the latter has been formed.
  17. Method according to one of Claims 1 to 11 and 13, characterized in that the step of attaching the first web (6) to the film (50) is carried out with at least two points (47, 49) situated on the web (6) either side of a longitudinal direction of the strip (10).
  18. Method according to one of Claims 1 to 11 and 13, characterized in that the step of attaching the first web (6) to the film (50) is carried out with a heat-sealing point situated on the side of the strips (10, 12) that will be inside the bag (30), once the latter has been formed and in that there is no equivalent heat-sealing point situated opposite, on the second web (8), this configuration making it possible in particular to form a hinge providing better resistance to an internal pressure in the bag (30).
  19. Method according to one of the preceding claims, characterized in that it comprises the attachment, to the film (50), of a sealing device (1) comprising a peelable heat-seal (18, 20, 21) joining the webs or parts of webs (6, 8), on the side that will be situated towards the outside of the bag (30) relative to the strips (10, 12), after the complete formation of this bag (30).
  20. Method according to one of the preceding claims, characterized in that it comprises the attachment, to the film (50), of a sealing device (1) while keeping one zone of the walls (32, 34) of the bag (30), not heat-sealed, on the side of the strips (10, 12) situated towards the outside of the bag (30).
  21. Method according to one of the preceding claims, characterized in that it comprises the attachment, to the film (50), of a sealing device (1) comprising two protective tapes (14, 16) which do not seal together, to form tabs (36, 38) suitable for grasping the walls (32, 34) of the bag (30).
  22. Method according to one of the preceding claims, characterized in that it comprises the attachment, to the film (50), of a device (1) which comprises a membrane (7) capable of forming a pourer nozzle or a funnel.
  23. Method according to one of Claims 1 and 3 to 22, characterized in that it comprises a step consisting in routing, upstream of a bag forming and filling spout (130), a film (50) furnished with first cut-outs (51), spaced from one another on the film (50) at a distance equal to the dimension of a bag (30) in the direction parallel to the movement (D) of the film (50).
  24. Method according to Claim 23, characterized in that it comprises a step consisting in positioning the sealing device (1) at each of the first cut-outs (51) and in heat-sealing at least one of the webs (6, 8) to the film (50), on at least one edge of the first cut-outs (51) thanks to first heat-sealing means (110).
  25. Method according to one of Claims 23 and 24, characterized in that it comprises a step consisting in making a second cut-out (53) in the film (50) opposite the first cut-out (51), downstream of longitudinal heat-sealing means (120).
EP99400946A 1998-04-20 1999-04-19 Process for making bags with closure Expired - Lifetime EP0951989B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9804913A FR2777498B1 (en) 1998-04-20 1998-04-20 METHOD AND MACHINE FOR FORMING PACKAGING BAGS WITH A CLOSING DEVICE
FR9804913 1998-04-20
FR9806292A FR2777499B1 (en) 1998-04-20 1998-05-19 METHOD AND MACHINE FOR FORMING PACKAGING BAGS WITH A CLOSING DEVICE
FR9806292 1998-05-19

Publications (2)

Publication Number Publication Date
EP0951989A1 EP0951989A1 (en) 1999-10-27
EP0951989B1 true EP0951989B1 (en) 2008-03-19

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EP99400946A Expired - Lifetime EP0951989B1 (en) 1998-04-20 1999-04-19 Process for making bags with closure

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US (5) US20020072460A1 (en)
EP (1) EP0951989B1 (en)
DE (1) DE69938373D1 (en)
FR (1) FR2777499B1 (en)

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Also Published As

Publication number Publication date
EP0951989A1 (en) 1999-10-27
US20040038791A1 (en) 2004-02-26
FR2777499B1 (en) 2000-07-07
DE69938373D1 (en) 2008-04-30
US20040023777A1 (en) 2004-02-05
US20040023772A1 (en) 2004-02-05
US20040023776A1 (en) 2004-02-05
US20020072460A1 (en) 2002-06-13
FR2777499A1 (en) 1999-10-22
US6983574B2 (en) 2006-01-10
US6928791B2 (en) 2005-08-16

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