EP0667288A1 - Vorrichtung und Verfahren zum Verpacken von Produkten in hermetischen, wiederverschliessbaren Verpackungen - Google Patents

Vorrichtung und Verfahren zum Verpacken von Produkten in hermetischen, wiederverschliessbaren Verpackungen Download PDF

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Publication number
EP0667288A1
EP0667288A1 EP95400289A EP95400289A EP0667288A1 EP 0667288 A1 EP0667288 A1 EP 0667288A1 EP 95400289 A EP95400289 A EP 95400289A EP 95400289 A EP95400289 A EP 95400289A EP 0667288 A1 EP0667288 A1 EP 0667288A1
Authority
EP
European Patent Office
Prior art keywords
film
profile
segments
welding
closure profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95400289A
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English (en)
French (fr)
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EP0667288B1 (de
Inventor
Henri Bois
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flexico France SARL
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Flexico France SARL
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Filing date
Publication date
Application filed by Flexico France SARL filed Critical Flexico France SARL
Publication of EP0667288A1 publication Critical patent/EP0667288A1/de
Application granted granted Critical
Publication of EP0667288B1 publication Critical patent/EP0667288B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • 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

Definitions

  • the invention relates to the packaging of products in sealed reclosable packages consisting of a flexible rectangular bag formed by two film portions provided with a closure profile.
  • Such bags generally comprise two portions of a film folded back on itself, closed longitudinally by welding and welded transversely on lateral sides parallel to each other and orthogonal to the longitudinal seal and to the closure profile.
  • the longitudinal closure profile is generally attached and welded to the film, parallel to the longitudinal weld.
  • the closure profile is generally a reclosable waterproof profile comprising a male part and a female part already engaged or not, this profile possibly being also possibly provided with ribs or other profiles allowing easy opening of the packages.
  • the invention will be described in the context of the packaging of a product operated simultaneously with the manufacture of the sachet, the invention can also be applied to the manufacture of empty sachets, simply by omitting from the process the stage of placing the product to be packaged.
  • closure profile creates an annoying excess thickness at each of its ends in order to achieve transverse sealing on the two lateral sides of the bag.
  • the generally adopted solution which is set out in particular in documents US-A-4,756,629, US-A-5,024,537 and EP-A-0 302,144, consists of providing, between the step of transferring and welding the profile onto the film of the bag and that of transverse welding of the lateral sides, an intermediate step of pre-crushing the ends of the profiles in the critical region situated in the extension of the lateral sides.
  • this pre-sealing step always causes surface unevenness, which can create leaks during the subsequent transverse welding of the sides of the bag detrimental to the sealing of the finished bag.
  • the subsequent welding step must be slowed down because the quantity of material provided by this part of the crushed profile requires additional heat input, therefore a longer application time of the welding jaws.
  • EP-A-0 528 721 proposes a different technique, consisting of feeding the profile no longer continuously, but through sections of length shorter than that of the bag to take account of the distance between the transverse welds.
  • profile sections are brought to the machine on a support strip whose dimensions are greater than those of the profiles, both in the longitudinal direction and in the transverse direction; the profile is then no longer welded directly to the bag, but via this support strip, which thus creates in the end regions only a small excess thickness.
  • the support strip is, in section, more uniform than the profile, it nevertheless creates an extra thickness, so that the disadvantages of the usual technique (with crushing of the edges of the profiles), if they are mitigated , are not however deleted.
  • this method is ill-suited to changes in bag length, profile width, etc., the preconditioning of the support strip and the setting of the machine having to be modified each time.
  • the object of the invention is to overcome all the drawbacks of known techniques, by proposing a method and a packaging machine making it possible to completely eliminate the pre-welding step from conventional methods, by ensuring perfect positioning of the profile without no risk of loss of sealing at the ends thereof, and which is very easily modifiable depending on the choice of profile and length of bag.
  • the method of the invention is therefore of the generic type comprising the steps, executed step by step and synchronously, consisting in: (a) unwinding longitudinally a continuous strip of film: (b) longitudinally folding this strip of film over it- even, in tubular form and join by welding the two longitudinal edges of the film; (c) longitudinally welding a closure profile to the film; (d) transversely welding the tubular film at regular intervals, along a weld joint and (e) transversely cutting the film at the location of the transverse weld joint so as to individualize and separate the bags;
  • the closure profile is sectioned in sequence of length equal to the length of the bag. reduced by the width, in transverse direction, of the weld joint produced in step (d) and before step (c) the individualized segments of the closure profile are introduced between two adjacent sheets of the film folded back on itself , so that the film drive participates in the synchronous drive of said closure profile segments to the welding station performing step (c).
  • the closure profile can be conveyed on the film in the form of precut segments.
  • the closure profile is preferably conveyed in the form of a continuous strip and cut into segments during an intermediate step prior to step (c), also eccentric step by step. and in synchronism with the other stages.
  • step (c) there is further provided an additional step consisting in verifying the longitudinal positioning of the profile segment relative to the film.
  • the invention also relates to a packaging machine, comprising the means for synchronized implementation of the various aforementioned stages.
  • the invention finally relates to the packaging sachets obtained by the implementation of this process.
  • Figure 1 is a partial plan view of a bag obtained by implementing a conventional packaging process.
  • Figure 2 illustrates a machine for implementing such a conventional method.
  • Figures 3, 4, 5 and 6 are schematic sections taken at lines III-III, IV-IV, V-V and VI-VI of Figure 2.
  • FIG. 7 illustrates a machine for implementing the method of the invention.
  • FIG. 8 shows in greater detail the upper part of the machine of FIG. 7.
  • FIG. 9 is equivalent to FIG. 1, for a sachet produced by implementing the method of the invention.
  • FIG. 10 schematically illustrates the relationship between the advance of the successive segments of cut section and the advances of the lengths of pitch of the sachets.
  • FIG. 1 is a partial view of a sachet produced by implementing a conventional method, such as that described by documents US-A-4,756,629, US-A-5,024,537 and EP-A-0 302,144 cited above, by means of the machine illustrated diagrammatically in FIG.
  • the raw material is a reel of film, printed or not, fed continuously from an unwinder delivering a flat sheet 1.
  • This flat sheet is brought to a station 2 for forming and filling where the sheet is folded over it. even so as to form on a tube composed essentially of two continuous sheets 3, 4 which will constitute the two walls of the sachet when the latter is individualized.
  • this same station is preferably filled with the product to be packaged 5, which will be enclosed between the two sheets of film 3, 4 folded back by the forming neck of the station 2.
  • the closure profile 6 is unrolled, continuously and at the same speed as the film, which is inserted for example on an edge region of the two sheets 3 and 4 just downstream of the forming neck of the station 2.
  • film 3, 4 and profile 6 progress step by step at the same rate, each step corresponding to a length of bag to be made and the stops for welding allowing the sides of the bags to be sealed at the different workstations that are going describe now.
  • the first welding station is used to fix the longitudinal edges of the film, to longitudinally close the tube thus formed.
  • This welding station 7 can also be used to fix the closing profile 6 on the sheets 3, 4 of the film when this profile 6 is placed in an edge region of the film.
  • the closure profile 6 can be fixed to the film 1 using additional welding means, similar to the means 7, when the closure profile 6 is placed at a distance from the edge region of the film.
  • This stage does not pose any particular difficulty, since it is carried out over a length of film and section of uniform section, without protrusion; the heating jaws 8 are positioned in the direction of the unwinding of the film and carry out the welding by thermal input and transverse pressure, as can be seen in the section of FIG. 3.
  • pre-welding is essential in this conventional machine to crush the ends of the profiles in the area where the transverse welding will be carried out, as explained in detail in the introduction to the present description.
  • two heating jaws 10 come, by mechanical, ultrasonic, hydraulic or pneumatic pressure, to crush the section of the profiles 6 which will be found later in the region 11 of the transverse weld made downstream. It is, as can be seen in Figure 1, to flatten the region 12 as best as possible in order to standardize as much as possible the transverse profile of the bag in region 11 where the sides of the bag will be welded.
  • FIG. 5 shows the appearance of the film-profile assembly after passage to the pre-welding station 9, with the crushed regions 13 and 14: as can be seen, as it is a simple crushing without removal of material, and as we are content to spread it, there will always remain, in transverse profile, surface unevenness which can subsequently create leaks detrimental to the sealing of the finished bag.
  • the next step, performed at station 15, consists in carrying out the transverse seal (edge region 11 of the bag), which will thus seal the packaging. This operation is carried out by compression between transverse heating jaws 16 (shown in section in FIG. 6).
  • this final welding step nevertheless presents risks of imperfections, because it is carried out, as has just been explained, on a surface having at the level of the profile a spreading of material generating an additional thickness (referenced 17 in the section of FIG. 6) preventing a uniform distribution of the support pressure and of the heat transfer necessary for good weld quality.
  • the duration of application of the jaws 16 must be extended, slowing down the production rate of the machine accordingly.
  • the final step consists in separating the sachets 18, now individualized, by means of a separation blade which detaches the sachets by separating them from the initial strip.
  • the invention essentially proposes to delete part of the profile in the transverse weld zone. This weld can then be carried out on a section with constant profile, without any excess thickness since the packaging obtained will no longer have a profile in this zoned. The welding times will be reduced (because the sections to be welded will have a constant profile) and the quality will be markedly improved, eliminating any risk of leakage in these regions.
  • station 2 a system for cutting profile segments simultaneously with their routing. More precisely, this system, referenced 18, comprises two sets 19 with belt and pulley coming to grip the continuous profile 6 and pass it in front of a shears 20 combined with upstream and downstream guides 21 and 22.
  • profile segments are immediately introduced between the two sheets of film 3, 4, so that these participate in the synchronous drive of these segments to the associated welding station.
  • This welding station can be formed from station 7 if the closure profile is placed on an edge region of the film, as indicated above, or from an additional welding station.
  • the synchronization of the station 18 with the rest of the machine is carried out, in itself known manner, from encoders, photoelectric cells, etc. and possibly automatons adapted to the required precision.
  • means are provided for checking the correct longitudinal positioning of the profile segments relative to the film, in order to immediately warn the operator in the event of a shift so that he can intervene without delay and adjust the adjustment of the machine.
  • the bag obtained, illustrated in FIG. 9, has a perfectly uniform and flawless thickness in the end region 12 of the transverse welding zone 11, the closure profile 6 stopping just before this end region 12 and does not not encroaching on it.
  • An additional advantage of the improvement of the invention lies in the fact that it can be directly adapted to a pre-existing machine, simply by adding the synchronized cutting system 18 immediately upstream of the forming neck of the station 2 and by removing or deactivating the pre-welding station 9 (for this reason shown in dotted lines in FIG. 7), which has now become useless.
  • the closure profile 6 is not conveyed in a continuous strip and cut in situ not to not immediately before the welding station using the means 18, but the closure profile 6 is precut on a separate machine.
  • the cutting station 18 is not necessary upstream of the forming neck 2.
  • the conveying means comprising a belt and pulley assembly 19 according to the embodiment described above can be the subject of numerous variants.
  • the longitudinal weld closing the packaging longitudinally can be provided either on an edge of the packaging leading to one end of the transverse welds, or at any point along the length of the packaging and consequently opening onto the length of the transverse welds.
  • the closure profile 6 can be placed either on an edge of the packaging leading to one end of the transverse welds, or at any point along the length of the packaging and consequently opening onto the length of the transverse welds.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Making Paper Articles (AREA)
  • Vacuum Packaging (AREA)
  • Packages (AREA)
EP95400289A 1994-02-14 1995-02-13 Vorrichtung und Verfahren zum Verpacken von Produkten in hermetischen, wiederverschliessbaren Verpackungen Expired - Lifetime EP0667288B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9401630 1994-02-14
FR9401630A FR2716158B1 (fr) 1994-02-14 1994-02-14 Machine et procédé de conditionnement de produits dans des emballages étanches refermables.

Publications (2)

Publication Number Publication Date
EP0667288A1 true EP0667288A1 (de) 1995-08-16
EP0667288B1 EP0667288B1 (de) 1998-04-22

Family

ID=9460040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400289A Expired - Lifetime EP0667288B1 (de) 1994-02-14 1995-02-13 Vorrichtung und Verfahren zum Verpacken von Produkten in hermetischen, wiederverschliessbaren Verpackungen

Country Status (5)

Country Link
EP (1) EP0667288B1 (de)
AT (1) ATE165294T1 (de)
DE (1) DE69502121T2 (de)
ES (1) ES2116689T3 (de)
FR (1) FR2716158B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020529A1 (en) * 1997-10-17 1999-04-29 Ica S.P.A. Procedure to fix a closed zipper-stripe inside a flexible container during its packaging
WO1999024322A2 (fr) 1997-11-06 1999-05-20 Flexico-France Machine de formation, remplissage et fermeture de sacs, a profiles de fermeture transversaux
WO2000071420A1 (en) * 1999-05-24 2000-11-30 Nigel Ervine Claxton Web structure and the production of a web structure
EP1106506A1 (de) 1999-12-03 2001-06-13 SIG Pack Systems AG Verfahren und Vorrichtung zur Herstellung von 3-Siegelrandbeuteln mit eingeschweisstem Verschlussprofil
US7163133B2 (en) 2004-03-05 2007-01-16 S.C. Johnson Home Storage, Inc. Apparatus for and method of moving a slider along mating zipper elements
US7244222B2 (en) 2004-03-05 2007-07-17 S.C. Johnson Home Storage, Inc. Apparatus for and method of positioning a slider on mating zipper elements

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6286189B1 (en) † 1999-05-10 2001-09-11 Pactiv Corporation Zipper and zipper arrangements and methods of manufacturing the same
DE102009008129A1 (de) * 2009-02-09 2010-10-07 Focke & Co.(Gmbh & Co. Kg) Verfahren und Vorrichtung zur Herstellung von Beuteln
DE102011106301A1 (de) * 2011-07-01 2013-01-03 Lemo Maschinenbau Gmbh Beutel und Verfahren zu seiner Herstellung
US20220041313A1 (en) 2018-10-15 2022-02-10 Gea Food Solutions Weert B.V. Vertical Flow-Wrapper, Bag With A Segment Of A Re-Closure Means And Method To Produce Re-Closable Bag
ES2887073T3 (es) * 2019-11-25 2021-12-21 Ulma Packaging Tech Ct Coop Máquina de envasado para generar envases recerrables

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4876842A (en) * 1988-01-15 1989-10-31 Minigrip, Inc. Method of and apparatus for packaging product masses in a form, fill and seal machine
EP0528721A2 (de) * 1991-08-09 1993-02-24 Minigrip, Incorporated Wiederverschliessbare Kunststoffbeutel und Verfahren zu deren Herstellung mit diskontinuierlichem Reissverschluss

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4876842A (en) * 1988-01-15 1989-10-31 Minigrip, Inc. Method of and apparatus for packaging product masses in a form, fill and seal machine
EP0528721A2 (de) * 1991-08-09 1993-02-24 Minigrip, Incorporated Wiederverschliessbare Kunststoffbeutel und Verfahren zu deren Herstellung mit diskontinuierlichem Reissverschluss

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020529A1 (en) * 1997-10-17 1999-04-29 Ica S.P.A. Procedure to fix a closed zipper-stripe inside a flexible container during its packaging
US6471818B1 (en) 1997-10-17 2002-10-29 Ica S.P.A. Procedure to fix a closed zipper-stripe inside a flexible container during its packaging
WO1999024322A2 (fr) 1997-11-06 1999-05-20 Flexico-France Machine de formation, remplissage et fermeture de sacs, a profiles de fermeture transversaux
WO2000071420A1 (en) * 1999-05-24 2000-11-30 Nigel Ervine Claxton Web structure and the production of a web structure
EP1106506A1 (de) 1999-12-03 2001-06-13 SIG Pack Systems AG Verfahren und Vorrichtung zur Herstellung von 3-Siegelrandbeuteln mit eingeschweisstem Verschlussprofil
US6675552B2 (en) 1999-12-03 2004-01-13 Sig Pack Systems Ag Method and device for producing bags with three sealed edges and welded-in closing seal
US7163133B2 (en) 2004-03-05 2007-01-16 S.C. Johnson Home Storage, Inc. Apparatus for and method of moving a slider along mating zipper elements
US7244222B2 (en) 2004-03-05 2007-07-17 S.C. Johnson Home Storage, Inc. Apparatus for and method of positioning a slider on mating zipper elements

Also Published As

Publication number Publication date
ATE165294T1 (de) 1998-05-15
FR2716158B1 (fr) 1996-05-10
ES2116689T3 (es) 1998-07-16
EP0667288B1 (de) 1998-04-22
DE69502121T2 (de) 1998-12-03
FR2716158A1 (fr) 1995-08-18
DE69502121D1 (de) 1998-05-28

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