EP1296876B1 - Package with strip closure system, method for making same - Google Patents

Package with strip closure system, method for making same Download PDF

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Publication number
EP1296876B1
EP1296876B1 EP01947549A EP01947549A EP1296876B1 EP 1296876 B1 EP1296876 B1 EP 1296876B1 EP 01947549 A EP01947549 A EP 01947549A EP 01947549 A EP01947549 A EP 01947549A EP 1296876 B1 EP1296876 B1 EP 1296876B1
Authority
EP
European Patent Office
Prior art keywords
films
welds
film
sheets
sheet
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
EP01947549A
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German (de)
French (fr)
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EP1296876A1 (en
Inventor
Jacques Thomasset
Carine Caudron
Stéphane MATHIEU
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.)
Soplaril SA
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Soplaril SA
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Publication date
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Publication of EP1296876A1 publication Critical patent/EP1296876A1/en
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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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B65D31/145—Valve bags, i.e. with valves for filling the filling port being provided in a flat upper sealing-edge
    • 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
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • 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
    • B31B70/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B31B70/85—Applying patches or flexible valve inserts, e.g. applying film-like valves

Definitions

  • the invention relates to a package according to the preamble of claim 1.
  • the package may be in the form of a bag three welds
  • No. 3,806,025 discloses a bladder bag stuffing hole intended to be filled with non-compressible liquid.
  • This bag comprises two sheets and two strips forming a valve, the strips being positioned one above the other and hermetically welded.
  • EP 300 094 discloses a container comprising flexible walls and a valve. Once the container is filled, the valve closes and remains in the closed position under the pressure of the contents.
  • GB 1 001 873 discloses a borehole stuffing bag made of thermoplastic material. This bag includes two sheets and a non-return valve consisting of two sheets.
  • US 3,282,412 discloses a package containing a product to be mixed with a second product to be added. The container comprises two flexible outer walls and a one-way valve simply allowing a liquid to enter for example.
  • GB-A-826 784 discloses a bag which is obtained by successive folding of a plastic film. This film is folded a first time along a straight line with a central orifice, two V-weld zones are applied, and the film is folded on itself. The three free sides are welded, as well as a part of the fourth side carrying the bellows with the V-welds. The presence of the opening at the bottom of the bellows, as well as the presence of the two V-welds and the partial welding of the side of the opening, would allow proper operation of the valve formed by the central orifice.
  • FR-A-2 711 115 discloses an inflatable bag provided with a valve. This bag is obtained by forming two parallel welds in a folded film on itself, which is then again folded back on itself, in a manner similar to that of GB-A-826 781. In this case, however, the folded film on itself is welded so as to leave the folded edges of the film accessible from the outside.
  • WO-A-95/23742 discloses a complex system obtained by successive folding with intermediate welding steps.
  • the bag obtained is double-walled.
  • the valve system is constituted by an attached film, which is pierced by application of a straw.
  • This film can be aluminum or polymer.
  • a weld hole is cleaned along two parallel lines (between which the straw will be placed). This part is then folded over the sheet which is welded along its ends. Another sheet is then added to form the container. The straw pierces the operculum, but when the straw is removed, the two walls are pressed against each other by the pressure of the fluid
  • JP-A-09-254999 discloses a package according to the preamble of claim 1, a pouch of synthetic resin.
  • the bag consists of two films hermetically sealed laterally. A strip is arranged parallel to a jaw between the two films. The band is partially provided with a non-adhesive part. This adhesive portion serves as a flow opening.
  • FR-A-1436 217 discloses a method of manufacturing a beverage packaging bag. According to this method, it is emptied by means of a torch, a further formed of a sheet of thermoplastic synthetic material. The addition is made from a tube with side pleats taken from a thermoplastic synthetic sheet. The torch is introduced into the case between the side folds applied against each other.
  • the invention makes it possible to remedy the defects of the systems of the prior art.
  • the invention provides a package comprising at least two sheets facing each other and two flexible films arranged between them, each flexible film being welded, respectively, over part of its length at one end of a sheet by a first weld, the flexible films being welded together and to the sheets by second vertical welds, extending substantially over the width of the films, the first welds extending substantially between the second vertical welds, at least one of the two films being folded over each other at the end of the films, opposed to the first welds.
  • the two films are welded together by third vertical welds, the third vertical welds being between the second vertical welds.
  • the two films are folded on themselves at the end of the films opposite to the first welds.
  • the fold formed by the film or films may be unfolded by introducing a straw between the films.
  • the fold formed by the film (s) is not likely to be unfolded by introducing a straw.
  • the package comprises an additional weld between the sheets.
  • the flexible films are PE, EVA, PP, OPP, PET, PA.
  • the leaves are semi-rigid.
  • the sheets and the flexible films have the following characteristics, with H the thickness in mm and E the equivalent module of the film in N.mm -2 :
  • the package is in the form of a three-weld bag.
  • the screen film is made of PTFE or teflon fabric.
  • a bag 1 comprises two sheets 2, 3 facing one another. These sheets are made of conventional material in the art, including plastic such as PET, OPP, PA, etc. These two sheets are particularly semi-rigid, in that they are likely to be deformed to accept dilation of the bag while providing general support to the bag.
  • the thickness of these two sheets is conventional in the art, for example a thickness of between 50 and 1000 ⁇ m , and preferably between 60 and 250 ⁇ m .
  • a flexible film 4 is made of a suitable material, including a plastic material.
  • This film 4 may be especially PE, or EVA, PP, OPP, PET, PA, etc. This film has a thickness between 10 and 500 microns , and preferably between 30 and 100 microns .
  • This film 4 is welded, for part of its length, to one end of the sheet 3 according to the weld 5 (which is represented here by hatching).
  • This film is also welded, on part of its width to the sheet 2, according to two welds 6a and 6b which define the width of the valve. These welds may be parallel or otherwise, perpendicular or not to the weld 5.
  • These welds 5 and 6a and 6b are arranged so that the weld 5 extends substantially between the welds 6a and 6b, which contributes to the seal.
  • the weld 5 extends completely between the welds 6a and 6b.
  • the welds 6a and 6b extend substantially over the width of the film strip 4, or even exceed this width.
  • the film is in the form of a strip having a width of between 5 and 200 mm, and preferably between 10 and 50 mm.
  • the length of the strip (in fact this time the width of the bag) is between 20 and 1500 mm, preferably between 50 and 400 mm.
  • Figures 2a and 2b show the operation of the valve thus formed.
  • the valve is in the open position (for example by introducing a straw).
  • the film 4 is then in contact with the sheet 3.
  • the internal pressures for example by the mere weight of the contents
  • Figure 2b illustrates this case; it is a section along the weld 6b to better indicate the phenomenon.
  • the arrows indicate the thrust operated for example by a fluid in the bag.
  • FIG. 3 represents, in section, and illustrates a manufacturing diagram of the bag of FIG. 1.
  • the manufacture makes use of a film-screen which allows a selective welding of the flexible film 4, either on the sheet 2, or on the 3.
  • the film 4 is welded in the form of a strip on the sheet 3 in a weld 5.
  • a film 7 forming a screen is introduced between the film strip 4 and the sheet 3. then affix the sheet 2 on the previous structure, and place it between two jaws welding machine or solder bars.
  • the jaw 8a is for example at room temperature while the jaw 8b is at a temperature sufficient to weld the film 4 to the sheet 2 according to the welds 6a and 6b.
  • both jaws are at the soldering temperature, depending on the film and rate.
  • the welding temperature can be between 130 and 250 ° C, depending on the material to be welded.
  • the screen film 7 is removed.
  • the closure system shown in FIG. 1 is thus obtained.
  • This screen film 7 is made of a material that is substantially insensitive to heat and does not adhere to the film at all. the welding temperature. It may be for example PTFE, or other material, such as teflon fabric.
  • the closure system shown in Figure 1 can be adapted to lower cost on existing bags. These pouches are the classic sachets, such as "Doypack", 3-weld bag, etc. Reference may be made, for example to the application FR 9 811 622, to US Pat. No. 3,380,646 and to the certificate of addition to patent FR-A-1 327 875.
  • the closure system may be placed at center or on one side of the bag, according to convenience. In most cases, a straw or other similar instrument will be provided with the bag. This straw, inserted between the sheets 2 and 3, is guided to the system described, spreads the sheets 2 and 3 at the weld 5, and is positioned naturally between the welds 6a and 6b. When the straw is removed, the walls formed on the one hand of the film 4 and on the other hand of the sheet 2, are pressed one on the other. This gives a seal.
  • This system may also comprise, as film 4 (or possibly as sheet 2), a film repositionable.
  • films are known and comprise a support film 4a, an adhesive layer 4b and a sealing layer 4c.
  • the welding layer is welded, along a bead, on the sheet 2 facing it (or on a sealing layer affixed to said sheet 2).
  • the band corresponding to the welded portion is secured to the sheet 2, which discovers the adhesive. Then, after the straw has been removed, apply pressure to completely close the system.
  • Such repositionable films are described for example in WO-A-9719867.
  • Such films are known and, unlike the previous films, do not comprise a permanent adhesive layer, but an intermediate layer 4d. These films ensure, as before, the integrity of the bag before straw boring, but they are not repositionable.
  • This weld 6c may be performed at the same time as the welds 6a and 6b, or later, according to the conventional techniques indicated in the documents of the prior art referred to above.
  • the pouch with the type I opening system fills in a conventional manner, as illustrated in Figures 4a and 4b (the closure system being on one side of the bag).
  • the weld 5 extends, as shown, over the entire length of the sheet 3 (but there could be solder 5 only on the part between the welds 6a and 6b).
  • the film 4 is welded to the sheet 2 only at the welds 6a and 6b, there is therefore a space between the film 4 and the sheet 2 on the area between the weld 6a and the rest of the bag. So we have a filling area represented by the arrow.
  • the weld 9 which extends from the weld 6a to the end of the bag, as shown in Figure 4b. This solder weld together the sheets 2 and 3 and the film 4.
  • FIGs 5a and 5b show, in section, the package according to the invention.
  • the film 4 is replaced by two films 10a and 10b.
  • Each film 10a and 10b is welded to the sheets 2 and 3, respectively, according to welds 11a and 11b (equivalent to the weld 5 according to the type I package).
  • the film 10a is not folded, while it is folded in Figure 5b.
  • These two new types are called type IIa and type IIb, respectively.
  • FIG. 6 shows a closed view of these second packages. Note the presence of two vertical welds 12a and 12b, which weld together the two sheets 2 and 3 and the films 10a and 10b. These welds 12a and 12b may be parallel or not, perpendicular or not to the welds 11a and 11ab. These welds 11a and 11b extend substantially between the welds 12a and 12b; preferably, the welds 11a and 11b extend completely between the welds 12a and 12b. The welds 12a and 12b extend substantially over the width of the film strips 10a and 10b, or even exceed this width. The valve defined by the welds 12a and 12b is then substantially sealed.
  • FIG. 6a shows a view in the closed state of a variant of these packages (in which the welds 11a and 11b have not been shown, and in which all the films and sheets have been represented). Note the presence of two vertical welds 12'a and 12'b, which weld together the films 10a and 10b, in their unfolded position. These welds 12'a and 12'b are between the welds 12a and 12b, which they weld together the sheets 2 and 3, and the films 10a and 10b, this time in the folded position.
  • This variant makes it easier to open by increasing the locking width of the fold; this gives a greater flexibility on the height of the fold.
  • the welds 11a and 11b likewise extend here completely between the welds 12a and 12b.
  • the position of the welds 12'a and 12'b relative to the welds 12a and 12b can vary widely. In general, the spacing between these welds 12'a and 12'b will represent between 5 and 50%, preferably between 10 and 35%, of the spacing between the welds 12a and 12b.
  • the valve defined by the welds 12'a and 12'b is here also substantially sealed.
  • FIGS. 7a and 7b show the closed valve, a fold of the film 10b covering the film 10a and sealing.
  • the introduction for example of a straw between the sheets 2 and 3 causes the separation of the films 10a and 10b and the opening of the valve as shown in FIG. 7b is obtained.
  • Straw or any other equivalent device such as a plug or funnel
  • the bag is empty. It is then filled, then the straw is removed, which closes the bag.
  • This system is particularly suitable when the (s) fold (s) of (the) film (s) 10a and 10b extend over a large part of the width (taking into account the spacing of the welds). In this case, it is difficult for the user to discard the films 10a and 10b from the fold; the delivery of the empty bag-in the open position-with the straw (or any other device) makes it a "trash” or scrap pouch that is very tight once the straw is removed.
  • This last variant is particularly suitable for hazardous products such as: cooking oil, waste oil, solvents, residues and industrial sludge.
  • a reversible or irreversible operation is obtained.
  • reversible operation with opening / closing cycles, there is a spacing between the welds 12a (respectively 12'a) and 12b (respectively 12'b) large in front of the height of the fold.
  • irreversible operation the bag being delivered open, with only the possible closure, one has a spacing between the welds 12a (respectively 12'a) and 12b (respectively 12'b) small before the height of the fold.
  • the choice of the respective dimensions is within the reach of the skilled person.
  • the characteristics of the films are substantially the same as for the type I.
  • the (s) fold (s) represents (s), in% of the spacing of the welds 12a (respectively 12'a) and 12b (respectively 12'b), between 5% and 50%. If opening with a straw is desired, the fold (es) generally represent 5 to 25%. If it is desired that the opening can not be done, the (s) fold (s) represent (s) in general, from 25 to 50%.
  • FIGS. 8a and 8b illustrate the process for preparing the type IIa or IIb sachets (Type IIa, first variant) has been chosen here.
  • FIG. 8a shows sheets 2 and 3, films 10a and 10b, and a screen film 7 of the same type as that used for the manufacture of the type I bag. Welding strips 13a and 13b heated. at the soldering temperature are applied to obtain the welds 11a and 11b. The screen film 7 is removed, and then, as shown in FIG. 8b, vertical welding strips 14a and 41b heated to the soldering temperature of the sheets 2 and 3 and films 10a and 10b are applied to obtain the welds 12a and 12b. Any other welding device of the bar / counterpart type is also usable.
  • the method further comprises the step 12'a welds and 12'b.
  • the step 12'a welds and 12'b it is possible to separate the sheets 2 and 3 of the films 10a and 10b to proceed with the welding. We can also fold the sheets 2 and 3 on themselves, to completely release the films 10a and 10b which is then very easy to weld them.
  • Figures 9a and 9b show the filling area.
  • the closure system is shown on one side of the bag.
  • the welds 11a and 11b on the one hand, and 12a and 12b on the other hand, are already affixed.
  • Figure 9a there is shown the free space between the film 10a and the sheet 2, which allows the filling schematically by the arrow.
  • the solder 15 is welded which extends from the weld 12a to the edge of the bag, as shown in Figure 9b. This solder weld together the sheets 2 and 3 and the films 10a and 10b.
  • Figure 10 shows a type IIa / IIb package.
  • the sheets 2 and 3 are furthermore welded along an additional line 27, affixed to an extension of the sheets 2 and 3.
  • a weakening line or a simple marking 28 may be affixed under the weld 27 in order to incite the user to cut the bag according to this marking. The additional welding ensures a total seal.
  • the packaging by its variants IIa / IIb thus offers many advantages, by the combination of two sheets 2 and 3 semi-rigid forming the body of the bag and two flexible films 10a, 10b.
  • the characteristics of the sheets and films are identical to that of the type I package and the description given with reference to FIG. 1 applies mutatis mutandis. The same applies to the other characteristics (width, length, conditions of use). , soldering conditions, etc.) when not specifically specified in an example of packaging.
  • the bag also has the advantage of being flat (before filling), which facilitates handling, decreases the packaging volumes of the bags.
  • the bag has an overall thickness generally less than 2 mm, preferably less than 500 ⁇ m .
  • the bags are suitable in all technical fields, including food, chemistry, detergents, cosmetics; for small liquids, powders, granules or solids (eg candies). As mentioned above, the bag may be for single use as a "bin”.
  • the sheets and films may comprise conventional additives, and consist of several layers, as is known in the art.
  • the films or sheets may comprise several layers, one of which is weldable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
  • Packages (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Cartons (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Package Closures (AREA)

Abstract

The subject of the invention is a package comprising at least two sheets ( 2, 3 ) and two flexible films ( 10 a, 10 b) placed between them and welded to the sheets ( 2, 3 ) by the welds ( 11 a, 11 b) respectively, and welded together and to the sheets ( 2, 3 ) by the welds ( 12 a, 12 b), at least one of the two films being folded over the other at that end of the films on the opposite side to the welds ( 11 a, 11 b). The subject of the invention is also a method for manufacturing such a package. The invention makes it possible to obtain a package of simplified structure and simplified manufacture.

Description

L'invention a pour objet un emballage selon le préambule de la revendication 1. L'emballage peut être sous forme d'un sachet trois souduresThe invention relates to a package according to the preamble of claim 1. The package may be in the form of a bag three welds

On connaît déjà de nombreux emballages ou sachets plastiques, munis ou non de valve.Many plastic packages or bags, with or without a valve, are already known.

US 3 806 025 décrit un sac de bourrage de trou de mine destiné à être rempli de liquide non compressible. Ce sac comprend deux feuilles et deux bandes formant une valve, les bandes étant positionnées l'une au-dessus de l'autre et soudées hermétiquement. EP 300 094 décrit un contenant comprenant des parois souples et une valve. Une fois le contenant rempli, la valve se ferme et reste en position fermée sous la pression du contenu. GB 1 001 873 décrit un sac de bourrage de trou de mine en matériau thermoplastique. Ce sac comprend deux feuilles et une valve anti-retour constituée de deux feuilles. US 3 282 412 décrit un conditionnement contenant un produit destiné à être mélangé avec un deuxième produit à ajouter. Le contenant comprend deux parois flexibles extérieures et une valve à sens unique laissant simplement entrer un liquide par exemple.No. 3,806,025 discloses a bladder bag stuffing hole intended to be filled with non-compressible liquid. This bag comprises two sheets and two strips forming a valve, the strips being positioned one above the other and hermetically welded. EP 300 094 discloses a container comprising flexible walls and a valve. Once the container is filled, the valve closes and remains in the closed position under the pressure of the contents. GB 1 001 873 discloses a borehole stuffing bag made of thermoplastic material. This bag includes two sheets and a non-return valve consisting of two sheets. US 3,282,412 discloses a package containing a product to be mixed with a second product to be added. The container comprises two flexible outer walls and a one-way valve simply allowing a liquid to enter for example.

GB-A-826 784 décrit un sachet qui est obtenu par pliage successif d'un film plastique. Ce film est plié une première fois le long d'une droite portant un orifice central, deux zones de soudure en V sont appliquées, puis le film est replié sur lui-même. Les trois côtés libres sont soudés, ainsi qu'une partie du quatrième côté portant le soufflet avec les soudures en V. La présence de l'ouverture au fond du soufflet, ainsi que la présence des deux soudures en V et la soudure partielle du côté de l'ouverture, permettraient un fonctionnement correct de la valve formée par l'orifice central.GB-A-826 784 discloses a bag which is obtained by successive folding of a plastic film. This film is folded a first time along a straight line with a central orifice, two V-weld zones are applied, and the film is folded on itself. The three free sides are welded, as well as a part of the fourth side carrying the bellows with the V-welds. The presence of the opening at the bottom of the bellows, as well as the presence of the two V-welds and the partial welding of the side of the opening, would allow proper operation of the valve formed by the central orifice.

FR-A-2 711 115 décrit un sachet gonflable muni d'une valve. Ce sachet est obtenu en formant deux soudures parallèles dans un film replié sur lui-même, qui est ensuite à nouveau replié sur lui-même, d'une façon similaire à celle de GB-A-826 781. Dans ce cas cependant, le film doublement replié sur lui-même est soudé de sorte à laisser les bords du film repliés accessibles de l'extérieur.FR-A-2 711 115 discloses an inflatable bag provided with a valve. This bag is obtained by forming two parallel welds in a folded film on itself, which is then again folded back on itself, in a manner similar to that of GB-A-826 781. In this case, however, the folded film on itself is welded so as to leave the folded edges of the film accessible from the outside.

WO-A-95/23742 décrit un système complexe obtenu par pliage successif avec des étapes de soudure intermédiaires. Selon une première variante, le sachet obtenu est à double paroi. Selon un mode de réalisation, à partir de cette première variante, on peut réaliser une poche souple avec une paroi simple. Dans ce cas, le système de valve est constitué par un film rapporté, qui se perce par application d'une paille. Ce film peut être en aluminium ou en polymère. Dans un premier temps, selon ce document, on ménage un orifice par soudure selon deux lignes parallèles (entre lesquelles sera placée la paille). Cette partie est ensuite repliée sur la feuille qui est soudée le long de ses extrémités. Une autre feuille est alors ajoutée, pour former le contenant. La paille perce l'opercule, mais lorsque la paille est retirée, les deux parois sont plaquées l'une contre l'autre par la pression du fluidWO-A-95/23742 discloses a complex system obtained by successive folding with intermediate welding steps. According to a first variant, the bag obtained is double-walled. According to one embodiment, from this first variant, it is possible to produce a flexible pouch with a single wall. In this case, the valve system is constituted by an attached film, which is pierced by application of a straw. This film can be aluminum or polymer. At first, according to this document, a weld hole is cleaned along two parallel lines (between which the straw will be placed). This part is then folded over the sheet which is welded along its ends. Another sheet is then added to form the container. The straw pierces the operculum, but when the straw is removed, the two walls are pressed against each other by the pressure of the fluid

Le document JP-A-09-254999 décrit un emballage selon le préambule de la revendication 1, un sachet en résine synthétique. Le sachet est constitué de deux films joints hermétiquement latéralement. Une bande est disposée parallèle à une mâchoire entre les deux films. La bande est munie partiellement d'une partie non-adhésive. Cette partie adhésive sert d'ouverture d'écoulement.JP-A-09-254999 discloses a package according to the preamble of claim 1, a pouch of synthetic resin. The bag consists of two films hermetically sealed laterally. A strip is arranged parallel to a jaw between the two films. The band is partially provided with a non-adhesive part. This adhesive portion serves as a flow opening.

FR-A-1 436 217 décrit un procédé de fabrication d'un sachet d'emballage pour boissons. Selon ce procédé, on vide au moyen d'un chalumeau, une outre formée d'une feuille de matière synthétique thermoplastique. L'outre est fabriquée en partant d'un tube à plis latéraux tiré d'une feuille synthétique thermoplastique. Le chalumeau est introduit dans l'outre entre les plis latéraux appliqués l'un contre l'autre.FR-A-1436 217 discloses a method of manufacturing a beverage packaging bag. According to this method, it is emptied by means of a torch, a further formed of a sheet of thermoplastic synthetic material. The addition is made from a tube with side pleats taken from a thermoplastic synthetic sheet. The torch is introduced into the case between the side folds applied against each other.

Les systèmes ci-dessus présentent cependant plusieurs inconvénients. Ils sont complexes et nécessitent un dispositif de pliage complexe. Ils ne permettent pas la prise en compte de bouchons, souvent associés à ce type de produit.The above systems, however, have several disadvantages. They are complex and require a complex folding device. They do not allow the consideration of plugs, often associated with this type of product.

L'invention permet de remédier aux défauts des systèmes de l'art antérieur. Ainsi, l'invention fournit un emballage comportant au moins deux feuilles en regard l'une de l'autre et deux films souples disposés entre elles, chaque film souple étant soudé, respectivement, sur une partie de sa longueur à une extrémité d'une feuille par une première soudure, les films souples étant soudés entre eux et aux feuilles par des deuxièmes soudures verticales, s'étendant sensiblement sur la largeur des films, les premières soudures s'étendant sensiblement entre les deuxièmes soudures verticales, au moins un des deux films étant replié sur l'autre à l'extrémité des films, opposée aux premières soudures.The invention makes it possible to remedy the defects of the systems of the prior art. Thus, the invention provides a package comprising at least two sheets facing each other and two flexible films arranged between them, each flexible film being welded, respectively, over part of its length at one end of a sheet by a first weld, the flexible films being welded together and to the sheets by second vertical welds, extending substantially over the width of the films, the first welds extending substantially between the second vertical welds, at least one of the two films being folded over each other at the end of the films, opposed to the first welds.

Selon une variante, les deux films sont soudés entre eux par des troisièmes soudures verticales, les troisièmes soudures verticales étant comprises entre les deuxièmes soudures verticales.According to one variant, the two films are welded together by third vertical welds, the third vertical welds being between the second vertical welds.

Selon une variante, les deux films sont repliés sur eux-mêmes à l'extrémité des films opposée aux premières soudures.According to one variant, the two films are folded on themselves at the end of the films opposite to the first welds.

Selon une variante, le repli formé par le ou les films est susceptible d'être déplié par introduction d'une paille entre les films.According to one variant, the fold formed by the film or films may be unfolded by introducing a straw between the films.

Selon encore une variante, le repli formé par le(s) film(s) n'est pas susceptible d'être déplié par introduction d'une paille.According to another variant, the fold formed by the film (s) is not likely to be unfolded by introducing a straw.

Selon une autre variante, l'emballage comporte une soudure supplémentaire entre les feuilles.According to another variant, the package comprises an additional weld between the sheets.

Selon encore une autre variante, les films souples sont en PE, EVA, PP, OPP, PET, PA.According to yet another variant, the flexible films are PE, EVA, PP, OPP, PET, PA.

On peut également prévoir que les feuilles soient semi-rigides.It is also possible that the leaves are semi-rigid.

Selon une variante, les feuilles et les films souples présentent les caractéristiques suivantes, avec H l'épaisseur en mm et E le module équivalent du film en N.mm-2: Feuille : H3E=0.1 à 50 N.mm Film : H3E=0.5.10-3 à 5 N.mm ; avec de préférence : feuille : H3E=0.5 à 25 N.mm film : H3E=0.05 à 1 N.mm avec, dans les deux cas, la relation :
H3E film < H3E.According to one variant, the sheets and the flexible films have the following characteristics, with H the thickness in mm and E the equivalent module of the film in N.mm -2 : Leaf : H 3 E = 0.1 to 50 N.mm Movie : H 3 E = 0.5.10 -3 to 5 mm; with preferably: leaf : H 3 E = 0.5 to 25 N.mm movie : H 3 E = 0.05 to 1 N.mm with, in both cases, the relationship:
H 3 E film <H 3 E.

Selon une autre variante, l'emballage est sous forme d'un sachet trois-soudures.According to another variant, the package is in the form of a three-weld bag.

L'invention concerne également un procédé de fabrication d'un emballage selon l'enseignement de l'invention, comprenant les étapes suivantes :

  • insertion d'un film-écran entre deux films souples, au moins un des deux films étant replié sur l'autre à une extrémité des films;
  • soudure des films souples sur deux feuilles en regard l'une de l'autre, chaque film souple étant soudé, respectivement, sur une partie de sa longueur à une extrémité d'une feuille par une première soudure, un des deux films étant replié sur l'autre à l'extrémité des films opposée aux premières soudures ;
  • extraction du film-écran;
  • éventuellement soudure des films ensemble selon des troisièmes soudures verticales comprises entre des deuxièmes soudure verticales; et
  • soudure des films et des feuilles ensemble selon des deuxièmes soudures verticales s'étendant sensiblement sur la largeur des films, les premières soudures s'étendant sensiblement entre les deuxièmes soudures verticales
The invention also relates to a method of manufacturing a package according to the teaching of the invention, comprising the following steps:
  • inserting a film-screen between two flexible films, at least one of the two films being folded over the other at one end of the films;
  • welding flexible films on two sheets facing each other, each flexible film being welded, respectively, over part of its length at one end of a sheet by a first weld, one of the two films being folded over the other at the end of the films opposite to the first welds;
  • extraction of the film-screen;
  • optionally welding the films together according to third vertical welds included between second vertical welds; and
  • welding the films and sheets together according to second vertical welds extending substantially over the width of the films, the first welds extending substantially between the second vertical welds

Selon une variante du procédé, le film-écran est en PTFE ou en toile téflonnée.According to a variant of the method, the screen film is made of PTFE or teflon fabric.

L'invention est maintenant décrite plus en détails dans la description qui suit, et en référence aux dessins, dans lesquels :

  • La figure 1 représente un emballage ;
  • Les figures 2a et 2b représentent le fonctionnement de cet emballage ;
  • La figure 3 représente un procédé de fabrication de cet emballage ;
  • Les figures 4a et 4b représentent le remplissage de cet emballage ; Les figures 1 à 4b ne sont pas des modes de réalisation selon l'invention, mais sont utiles à la compréhension de l'invention.
  • Les figures 5a et 5b représentent deux variantes d'un emballage selon l'invention;
  • La figure 6 représente ledit emballage selon l'invention ;
  • La figure 6a représente une variante dudit emballage selon l'invention Les figures 7a et 7b représentent le fonctionnement dudit emballage selon l'invention ;
  • Les figures 8a et 8b représentent un procédé de fabrication dudit emballage selon l'invention ;
  • Les figures 9a et 9b représentent le remplissage dudit emballage selon l'invention ;
  • La figure 10 représente une variante des emballages selon l'invention.
The invention is now described in more detail in the description which follows, and with reference to the drawings, in which:
  • Figure 1 shows a package;
  • Figures 2a and 2b show the operation of this package;
  • Figure 3 shows a method of manufacturing this package;
  • Figures 4a and 4b show the filling of this package; Figures 1 to 4b are not embodiments of the invention, but are useful for understanding the invention.
  • Figures 5a and 5b show two variants of a package according to the invention;
  • Figure 6 shows said package according to the invention;
  • FIG. 6a shows a variant of said packaging according to the invention. FIGS. 7a and 7b show the operation of said packaging according to the invention;
  • Figures 8a and 8b show a method of manufacturing said package according to the invention;
  • Figures 9a and 9b show the filling of said package according to the invention;
  • Figure 10 shows a variant of the packages according to the invention.

En référence à l'éclaté de la figure 1, un sachet 1 comprend deux feuilles 2, 3 en regard l'une de l'autre. Ces feuilles sont constituées de matière classique dans l'art, notamment en matière plastique telle que PET, OPP, PA, etc.. Ces deux feuilles sont notamment semi-rigides, en ce sens qu'elles sont susceptibles d'être déformées pour accepter la dilatation du sachet tout en fournissant un maintien général au sachet. L'épaisseur de ces deux feuilles est classique dans l'art, par exemple une épaisseur comprise entre 50 et 1000 µm, et de préférence entre 60 et 250 µm. Entre ces feuilles 2 et 3, est disposé un film souple 4. Ce film souple est en un matériau approprié, notamment une matière plastique. Ce film 4 peut être notamment en PE, ou encore en EVA, PP, OPP, PET, PA, etc.. Ce film présente une épaisseur comprise entre 10 et 500 µm, et de préférence entre 30 et 100 µm.Referring to the exploded figure 1, a bag 1 comprises two sheets 2, 3 facing one another. These sheets are made of conventional material in the art, including plastic such as PET, OPP, PA, etc. These two sheets are particularly semi-rigid, in that they are likely to be deformed to accept dilation of the bag while providing general support to the bag. The thickness of these two sheets is conventional in the art, for example a thickness of between 50 and 1000 μm , and preferably between 60 and 250 μm . Between these sheets 2 and 3, is disposed a flexible film 4. This flexible film is made of a suitable material, including a plastic material. This film 4 may be especially PE, or EVA, PP, OPP, PET, PA, etc. This film has a thickness between 10 and 500 microns , and preferably between 30 and 100 microns .

De façon générale, ces feuilles 2 et 3 et ce film souple 4 présentent des modules et épaisseurs tels que, avec H l'épaisseur en mm et E le module équivalent du film en N.mm-2 : feuille semi-rigide : H3E=0.1 à 50 N.mm film souple : H3E=0.5.10-3 à 5 N.mm de préférence : feuille semi-rigide : H3E=0.5 à 25 N.mm film souple : H3E=0.05 à 1 N.mm avec, dans les deux cas, la relation :
H3E film souple < H3E feuille semi-rigide.In general, these sheets 2 and 3 and this flexible film 4 have modules and thicknesses such that, with H the thickness in mm and E the equivalent module of the film in N.mm -2 : semi-rigid sheet: H 3 E = 0.1 to 50 N.mm flexible film: H 3 E = 0.5.10 -3 to 5 N.mm preferably semi-rigid sheet: H 3 E = 0.5 to 25 N.mm flexible film: H 3 E = 0.05 to 1 N.mm with, in both cases, the relationship:
H 3 E flexible film <H 3 E semi-rigid sheet.

Ce film 4 est soudé, sur une partie de sa longueur, à une extrémité de la feuille 3 selon la soudure 5 (qui est représentée ici par des hachures). Ce film est aussi soudé, sur une partie de sa largeur à la feuille 2, selon deux soudures 6a et 6b qui définissent la largeur de la valve. Ces soudures peuvent être parallèles ou non, perpendiculaires ou non à la soudure 5. Ces soudures 5 et 6a et 6b sont agencées de sorte que la soudure 5 s'étende sensiblement entre les soudures 6a et 6b, ce qui contribue à l'étanchéité. De préférence, la soudure 5 s'étend complètement entre les soudures 6a et 6b. Les soudures 6a et 6b s'étendent sensiblement sur la largeur de la bande de film 4, voire dépassent cette largeur. Ce système très simple offre les mêmes avantages que l'art antérieur, notamment WO-A-95 23742, mais sans les inconvénients des pliages et soudures successifs et nombreux.This film 4 is welded, for part of its length, to one end of the sheet 3 according to the weld 5 (which is represented here by hatching). This film is also welded, on part of its width to the sheet 2, according to two welds 6a and 6b which define the width of the valve. These welds may be parallel or otherwise, perpendicular or not to the weld 5. These welds 5 and 6a and 6b are arranged so that the weld 5 extends substantially between the welds 6a and 6b, which contributes to the seal. Preferably, the weld 5 extends completely between the welds 6a and 6b. The welds 6a and 6b extend substantially over the width of the film strip 4, or even exceed this width. This very simple system offers the same advantages as the prior art, in particular WO-A-95 23742, but without the disadvantages of successive and numerous folds and welds.

A titre d'exemple, le film est sous forme d'une bande d'une largeur comprise entre 5 et 200 mm, et de préférence entre 10 et 50 mm. La longueur de la bande (en fait cette fois la largeur du sachet) est comprise entre 20 et 1500 mm, de préférence entre 50 et 400 mm.By way of example, the film is in the form of a strip having a width of between 5 and 200 mm, and preferably between 10 and 50 mm. The length of the strip (in fact this time the width of the bag) is between 20 and 1500 mm, preferably between 50 and 400 mm.

Les figures 2a et 2b montrent le fonctionnement de la valve ainsi formée. Dans la figure 2a, la valve est en position ouverte (par exemple par introduction d'une paille). Le film 4 est alors en contact avec la feuille 3. Quand on relâche le système, les pressions internes (par exemple par le seul poids du contenu) viennent plaquer le film 4 sur la feuille 2 avec laquelle il est soudé selon les soudures 6a et 6b. Ainsi, on obtient l'étanchéité. La figure 2b illustre ce cas; il s'agit d'une coupe selon la soudure 6b afin de mieux indiquer le phénomène. Les flèches indiquent la poussée opérée par exemple par un fluide dans le sachet.Figures 2a and 2b show the operation of the valve thus formed. In Figure 2a, the valve is in the open position (for example by introducing a straw). The film 4 is then in contact with the sheet 3. When the system is released, the internal pressures (for example by the mere weight of the contents) come to press the film 4 on the sheet 2 with which it is welded according to the welds 6a and 6b. Thus, the tightness is achieved. Figure 2b illustrates this case; it is a section along the weld 6b to better indicate the phenomenon. The arrows indicate the thrust operated for example by a fluid in the bag.

La figure 3 représente, en coupe, et illustre un schéma de fabrication du sachet de la figure 1. La fabrication fait emploi d'un film-écran qui permet une soudure sélective du film souple 4, soit sur la feuille 2, soit sur la feuille 3. Dans un premier temps, on soude le film 4 sous forme d'une bande sur la feuille 3 selon une soudure 5. Ensuite, on introduit un film 7 formant écran entre la bande de film 4 et la feuille 3. On vient ensuite apposer la feuille 2 sur la structure précédente, et on place le tout entre deux mâchoires d'une machine à souder ou barrettes de soudure. L'une d'entre elles, la mâchoire 8a est par exemple à la température ambiante tandis que la mâchoire 8b est à une température suffisante pour souder le film 4 à la feuille 2 selon les soudures 6a et 6b. Il est également possible d'avoir une barrette chauffée sur une contre-partie en silicone. Il est également possible que les deux mâchoires soient à la température de soudure, en fonction du film et de la cadence. A titre d'exemple, la température de soudure peut être comprise entre 130 et 250°C, en fonction du matériau à souder. Une fois la soudure effectuée, on retire le film écran 7. On obtient ainsi le système de fermeture représenté à la figure 1. Ce film 7 formant écran est en un matériau sensiblement insensible à la chaleur et qui n'adhère pas sur le film à la température de soudure. Il peut être par exemple en PTFE, ou en un autre matériau, tel que de la toile téflonnée. On pourrait aussi avoir une séquence inverse avec formation des soudures 6a et 6b, insertion d'une feuille 7 entre ces soudures, puis formation de la soudure 5.FIG. 3 represents, in section, and illustrates a manufacturing diagram of the bag of FIG. 1. The manufacture makes use of a film-screen which allows a selective welding of the flexible film 4, either on the sheet 2, or on the 3. In a first step, the film 4 is welded in the form of a strip on the sheet 3 in a weld 5. Next, a film 7 forming a screen is introduced between the film strip 4 and the sheet 3. then affix the sheet 2 on the previous structure, and place it between two jaws welding machine or solder bars. One of them, the jaw 8a is for example at room temperature while the jaw 8b is at a temperature sufficient to weld the film 4 to the sheet 2 according to the welds 6a and 6b. It is also possible to have a heated strip on a silicone counterpart. It is also possible that both jaws are at the soldering temperature, depending on the film and rate. For example, the welding temperature can be between 130 and 250 ° C, depending on the material to be welded. After welding, the screen film 7 is removed. The closure system shown in FIG. 1 is thus obtained. This screen film 7 is made of a material that is substantially insensitive to heat and does not adhere to the film at all. the welding temperature. It may be for example PTFE, or other material, such as teflon fabric. One could also have an inverse sequence with formation of the welds 6a and 6b, insertion of a sheet 7 between these welds, then formation of the weld 5.

Le système de fermeture représenté à la figure 1 (et dénommé de type I dans ce qui suit) peut être adapté à moindre coût sur des sachets existants. Ces sachets sont les sachets classiques, tel que "Doypack", sachet 3-soudures, etc. On pourra se référer, par exemple à la demande FR 9 811 622, au brevet US-A-3 380 646 ainsi qu'au certificat d'addition au brevet FR-A-1 327 875. Le système de fermeture peut être placé au centre ou sur un côté du sachet, selon la convenance. Dans une grande partie des cas, une paille ou tout autre instrument similaire sera fourni avec le sachet. Cette paille, insérée entre les feuilles 2 et 3, est guidée jusqu'au système décrit, écarte les feuilles 2 et 3 au niveau de la soudure 5, et se positionne naturellement entre les soudures 6a et 6b. Lorsque la paille est retirée, les parois formées d'une part du film 4 et d'autre part de la feuille 2, sont plaquées l'une sur l'autre. On obtient ainsi une étanchéité.The closure system shown in Figure 1 (and referred to as type I in the following) can be adapted to lower cost on existing bags. These pouches are the classic sachets, such as "Doypack", 3-weld bag, etc. Reference may be made, for example to the application FR 9 811 622, to US Pat. No. 3,380,646 and to the certificate of addition to patent FR-A-1 327 875. The closure system may be placed at center or on one side of the bag, according to convenience. In most cases, a straw or other similar instrument will be provided with the bag. This straw, inserted between the sheets 2 and 3, is guided to the system described, spreads the sheets 2 and 3 at the weld 5, and is positioned naturally between the welds 6a and 6b. When the straw is removed, the walls formed on the one hand of the film 4 and on the other hand of the sheet 2, are pressed one on the other. This gives a seal.

Ce système peut aussi comprendre, en tant que film 4 (ou éventuellement en tant que feuille 2), un film repositionnable. De tels films sont connus et comprennent un film support 4a, une couche d'adhésif 4b et une couche soudante 4c. la couche soudante est soudée, selon un cordon, sur la feuille 2 lui faisant face (ou sur une couche soudante apposée sur ladite feuille 2). Lors de la déchirure, la bande correspondant à la partie soudée est solidaire de la feuille 2, ce qui découvre l'adhésif. On peut alors, après que la paille a été retirée, appliquer une pression pour refermer complètement le système.This system may also comprise, as film 4 (or possibly as sheet 2), a film repositionable. Such films are known and comprise a support film 4a, an adhesive layer 4b and a sealing layer 4c. the welding layer is welded, along a bead, on the sheet 2 facing it (or on a sealing layer affixed to said sheet 2). Upon tearing, the band corresponding to the welded portion is secured to the sheet 2, which discovers the adhesive. Then, after the straw has been removed, apply pressure to completely close the system.

De tels films repositionnables sont décrits par exemple dans WO-A-9719867. On peut aussi utiliser, non plus un film repositionnable, mais un film pelable. De tels films sont connus et, à la différence des films précédents, ne comprennent pas de couche d'adhésif permanent, mais une couche intermédiaire 4d. Ces films assurent, comme précédemment, l'intégrité du sachet avant percement par paille, mais ils ne sont pas repositionnables. Dans ces deux cas, on peut souder la bande de film 4 sur la feuille 2 selon une soudure 6c supplémentaire, située entre les soudures 6a et 6b, à l'extrémité inférieure de celles-ci (la soudure 5 étant à l'extrémité supérieure). Cette soudure 6c peut s'effectuer en même temps que les soudures 6a et 6b, ou ultérieurement, selon les techniques classiques indiquées dans les documents de l'art antérieur visés plus haut.Such repositionable films are described for example in WO-A-9719867. We can also use, not a repositionable film, but a peelable film. Such films are known and, unlike the previous films, do not comprise a permanent adhesive layer, but an intermediate layer 4d. These films ensure, as before, the integrity of the bag before straw boring, but they are not repositionable. In these two cases, it is possible to weld the film strip 4 on the sheet 2 according to an additional weld 6c, located between the welds 6a and 6b, at the lower end thereof (the weld 5 being at the upper end ). This weld 6c may be performed at the same time as the welds 6a and 6b, or later, according to the conventional techniques indicated in the documents of the prior art referred to above.

Le sachet muni du système d'ouverture de type I se remplit de façon classique, comme illustré sur les figures 4a et 4b (le système de fermeture étant sur un côté du sachet). La soudure 5 s'étend, tel que représenté, sur la totalité de la longueur de la feuille 3 (mais on pourrait n'avoir de soudure 5 que sur la partie entre les soudures 6a et 6b). Dans la mesure où le film 4 n'est soudé à la feuille 2 qu'au niveau des soudures 6a et 6b, il y a donc un espace entre ce film 4 et la feuille 2 sur la zone comprise entre la soudure 6a et le reste du sachet. On a donc une zone de remplissage représentée par la flèche. Une fois le remplissage effectué, on vient souder selon la soudure 9 qui s'étend de la soudure 6a à l'extrémité du sachet, comme représenté à la figure 4b. Cette soudure soude ensemble les feuilles 2 et 3 et le film 4.The pouch with the type I opening system fills in a conventional manner, as illustrated in Figures 4a and 4b (the closure system being on one side of the bag). The weld 5 extends, as shown, over the entire length of the sheet 3 (but there could be solder 5 only on the part between the welds 6a and 6b). Insofar as the film 4 is welded to the sheet 2 only at the welds 6a and 6b, there is therefore a space between the film 4 and the sheet 2 on the area between the weld 6a and the rest of the bag. So we have a filling area represented by the arrow. Once the filling is completed, it is welded according to the weld 9 which extends from the weld 6a to the end of the bag, as shown in Figure 4b. This solder weld together the sheets 2 and 3 and the film 4.

Les figures 5a et 5b représentent, en coupe, l'emballage selon l'invention. Dans cet emballage, le film 4 est remplacé par deux films 10a et 10b. Chaque film 10a et 10b est soudé sur les feuilles 2 et 3, respectivement, selon des soudures 11a et 11b (équivalentes à la soudure 5 selon l'emballage du type I). Dans la figure 5a, le film 10a n'est pas replié, tandis qu'il est replié dans la figure 5b. Ces deux nouveaux types sont dénommés respectivement type IIa et type IIb.Figures 5a and 5b show, in section, the package according to the invention. In this package, the film 4 is replaced by two films 10a and 10b. Each film 10a and 10b is welded to the sheets 2 and 3, respectively, according to welds 11a and 11b (equivalent to the weld 5 according to the type I package). In Figure 5a, the film 10a is not folded, while it is folded in Figure 5b. These two new types are called type IIa and type IIb, respectively.

La figure 6 représente une vue à l'état fermé de ces seconds emballages. On note la présence de deux soudures verticales 12a et 12b, qui soudent ensemble les deux feuilles 2 et 3 ainsi que les films 10a et 10b. Ces soudures 12a et 12b peuvent être parallèles ou non, perpendiculaires ou non aux soudures 11a et 11ab. Ces soudures 11a et 11b s'étendent sensiblement entre les soudures 12a et 12b; de préférence, les soudures 11a et 11b s'étendent complètement entre les soudures 12a et 12b. Les soudures 12a et 12b s'étendent sensiblement sur la largeur des bandes de film 10a et 10b, voire dépassent cette largeur. La valve définie par les soudures 12a et 12b est alors sensiblement étanche.Figure 6 shows a closed view of these second packages. Note the presence of two vertical welds 12a and 12b, which weld together the two sheets 2 and 3 and the films 10a and 10b. These welds 12a and 12b may be parallel or not, perpendicular or not to the welds 11a and 11ab. These welds 11a and 11b extend substantially between the welds 12a and 12b; preferably, the welds 11a and 11b extend completely between the welds 12a and 12b. The welds 12a and 12b extend substantially over the width of the film strips 10a and 10b, or even exceed this width. The valve defined by the welds 12a and 12b is then substantially sealed.

La figure 6a représente une vue à l'état fermé d'une variante de ces emballages (dans lequel on n'a pas représenté les soudures 11a et 11b, et dans lequel on a par contre représenté tous les films et feuilles). On note la présence de deux soudures verticales 12'a et 12'b, qui soudent ensemble les films 10a et 10b, dans leur position non-pliée. Ces soudures 12'a et 12'b sont comprise entre les soudures 12a et 12b, qui elles soudent ensemble les feuilles 2 et 3, et les films 10a et 10b, cette fois en position pliée. Cette variante permet de faciliter l'ouverture en augmentant la largeur de blocage du pli; on obtient ainsi une plus grande souplesse sur la hauteur du pli. Les soudures 11a et 11b s'étendent de même ici complètement entre les soudures 12a et 12b. La position des soudures 12'a et 12'b par rapport aux soudures 12a et 12b peut varier dans de grandes mesures. En général, l'écartement entre ces soudures 12'a et 12'b représentera entre 5 et 50%, de préférence entre 10 et 35%, de l'écartement entre les soudures 12a et 12b. La valve définie par les soudures 12'a et 12'b est ici aussi sensiblement étanche. Les autres caractéristiques décrites en référence à la figure 6 s'appliquent mutatis mutandis.FIG. 6a shows a view in the closed state of a variant of these packages (in which the welds 11a and 11b have not been shown, and in which all the films and sheets have been represented). Note the presence of two vertical welds 12'a and 12'b, which weld together the films 10a and 10b, in their unfolded position. These welds 12'a and 12'b are between the welds 12a and 12b, which they weld together the sheets 2 and 3, and the films 10a and 10b, this time in the folded position. This variant makes it easier to open by increasing the locking width of the fold; this gives a greater flexibility on the height of the fold. The welds 11a and 11b likewise extend here completely between the welds 12a and 12b. The position of the welds 12'a and 12'b relative to the welds 12a and 12b can vary widely. In general, the spacing between these welds 12'a and 12'b will represent between 5 and 50%, preferably between 10 and 35%, of the spacing between the welds 12a and 12b. The valve defined by the welds 12'a and 12'b is here also substantially sealed. The other features described with reference to FIG. 6 apply mutatis mutandis.

Le fonctionnement de la valve est mieux expliqué en référence aux figures 7a et 7b (avec par exemple le type IIa, première variante -i.e. sans les soudures 12'a et 12'b-). La figure 7a montre la valve fermée, un repli du film 10b recouvrant le film 10a et assurant l'étanchéité. L'introduction par exemple d'une paille entre les feuilles 2 et 3 provoque l'écartement des films 10a et 10b et on obtient l'ouverture de la valve telle que représenté à la figure 7b. Lorsque la paille est retirée, les films 10a et 10b reprennent leur position initiale et la valve est à nouveau fermée. La paille (ou tout autre dispositif équivalent tel qu'un bouchon ou un entonnoir) peut être présente lorsque le sachet est vide. On le remplit alors, puis on retire la paille, ce qui ferme le sachet. Ce système est particulièrement adapté lorsque le(s) repli(s) du (des) film(s) 10a et 10b s'étendent sur une grande partie de la largeur (en tenant compte de l'écartement des soudures). Dans ce cas, il est difficile pour l'utilisateur d'écarter les films 10a et 10b de par le pli; la livraison du sachet vide -en position ouverte- avec la paille (ou tout autre dispositif) en fait une "poubelle" ou sachet à rebus qui est très étanche une fois la paille retirée. Cette dernière variante est particulièrement adaptée pour les produits dangereux tels que: huile de friture, huile de vidange, solvants, résidus et boues industrielles.The operation of the valve is better explained with reference to FIGS. 7a and 7b (with for example the type IIa, first variant -i.e. without the welds 12'a and 12'b-). Figure 7a shows the closed valve, a fold of the film 10b covering the film 10a and sealing. The introduction for example of a straw between the sheets 2 and 3 causes the separation of the films 10a and 10b and the opening of the valve as shown in FIG. 7b is obtained. When the straw is removed, the films 10a and 10b return to their original position and the valve is closed again. Straw (or any other equivalent device such as a plug or funnel) may be present when the bag is empty. It is then filled, then the straw is removed, which closes the bag. This system is particularly suitable when the (s) fold (s) of (the) film (s) 10a and 10b extend over a large part of the width (taking into account the spacing of the welds). In this case, it is difficult for the user to discard the films 10a and 10b from the fold; the delivery of the empty bag-in the open position-with the straw (or any other device) makes it a "trash" or scrap pouch that is very tight once the straw is removed. This last variant is particularly suitable for hazardous products such as: cooking oil, waste oil, solvents, residues and industrial sludge.

Ainsi, on obtient, selon la configuration choisie, un fonctionnement réversible ou irréversible. Dans le cas du fonctionnement réversible, avec des cycles ouverture/fermeture, on a un écartement entre les soudures 12a (resp. 12'a) et 12b (resp. 12'b) grand devant la hauteur du pli. Dans le cas du fonctionnement irréversible, le sachet étant livré ouvert, avec seule la fermeture possible, on a un écartement entre les soudures 12a (resp. 12'a) et 12b (resp. 12'b) petit devant la hauteur du pli. Le choix des dimensions respectives est à la portée de l'homme du métier.Thus, according to the chosen configuration, a reversible or irreversible operation is obtained. In the case of reversible operation, with opening / closing cycles, there is a spacing between the welds 12a (respectively 12'a) and 12b (respectively 12'b) large in front of the height of the fold. In the case of irreversible operation, the bag being delivered open, with only the possible closure, one has a spacing between the welds 12a (respectively 12'a) and 12b (respectively 12'b) small before the height of the fold. The choice of the respective dimensions is within the reach of the skilled person.

Les caractéristiques des films (épaisseur, etc.) sont sensiblement les mêmes que pour le type I. Le (s) repli (s) représente(nt), en % de l'écartement des soudures 12a (resp. 12'a) et 12b (resp. 12'b), entre 5% et 50%. Si on souhaite une ouverture par une paille, le(s) repli(s) représente(nt) en général de 5 à 25%. Si on souhaite que l'ouverture ne puisse pas se faire, le(s) repli(s) représente(nt) en général, de 25 à 50%.The characteristics of the films (thickness, etc.) are substantially the same as for the type I. The (s) fold (s) represents (s), in% of the spacing of the welds 12a (respectively 12'a) and 12b (respectively 12'b), between 5% and 50%. If opening with a straw is desired, the fold (es) generally represent 5 to 25%. If it is desired that the opening can not be done, the (s) fold (s) represent (s) in general, from 25 to 50%.

Les figures 8a et 8b illustrent le procédé de préparation des sachets de type IIa ou IIb (on a choisi de représenter ici le type IIa, première variante). Sur la figure 8a, on voit les feuilles 2 et 3, les films 10a et 10b, ainsi qu'un film-écran 7 de même nature que celui utilisé pour la fabrication du sachet de type I. Des barrettes de soudure 13a et 13b chauffées à la température de soudure sont appliquées afin d'obtenir les soudures 11a et 11b. Le film-écran 7 est retiré, puis comme représenté à la figure 8b, des barrettes de soudure verticales 14a et 41b, chauffées à la température de soudure des feuilles 2 et 3 et des films 10a et 10b sont appliquées pour obtenir les soudures 12a et 12b. Tout autre dispositif de soudure du type barrette/contre-partie est aussi utilisable.FIGS. 8a and 8b illustrate the process for preparing the type IIa or IIb sachets (Type IIa, first variant) has been chosen here. FIG. 8a shows sheets 2 and 3, films 10a and 10b, and a screen film 7 of the same type as that used for the manufacture of the type I bag. Welding strips 13a and 13b heated. at the soldering temperature are applied to obtain the welds 11a and 11b. The screen film 7 is removed, and then, as shown in FIG. 8b, vertical welding strips 14a and 41b heated to the soldering temperature of the sheets 2 and 3 and films 10a and 10b are applied to obtain the welds 12a and 12b. Any other welding device of the bar / counterpart type is also usable.

Dans le cas de la seconde variante, le procédé comprend de plus l'étape des soudures 12'a et 12'b. Dans un tel cas, il est possible d'écarter les feuilles 2 et 3 des films 10a et 10b pour procéder à la soudure. On peut aussi replier les feuilles 2 et 3 sur elles-mêmes, pour libérer complètement les films 10a et 10b qu'il est alors très aisé de souder entre eux.In the case of the second variant, the method further comprises the step 12'a welds and 12'b. In such a case, it is possible to separate the sheets 2 and 3 of the films 10a and 10b to proceed with the welding. We can also fold the sheets 2 and 3 on themselves, to completely release the films 10a and 10b which is then very easy to weld them.

Les figures 9a et 9b montrent la zone de remplissage. Le système de fermeture est représenté sur un côté du sachet. Les soudures 11a et 11b d'une part, et 12a et 12b d'autre part, sont déjà apposées. Sur la figure 9a, on a représenté l'espace ménagé libre entre le film 10a et la feuille 2, qui permet le remplissage schématisé par la flèche. Une fois le remplissage effectué, on vient souder la soudure 15 qui s'étend à partir de la soudure 12a jusqu'au bord du sachet, comme représenté à la figure 9b. Cette soudure soude ensemble les feuilles 2 et 3 et les films 10a et 10b.Figures 9a and 9b show the filling area. The closure system is shown on one side of the bag. The welds 11a and 11b on the one hand, and 12a and 12b on the other hand, are already affixed. In Figure 9a, there is shown the free space between the film 10a and the sheet 2, which allows the filling schematically by the arrow. Once filling performed, the solder 15 is welded which extends from the weld 12a to the edge of the bag, as shown in Figure 9b. This solder weld together the sheets 2 and 3 and the films 10a and 10b.

La figure 10 représente un emballage du type IIa/IIb. Dans cet emballage, les feuilles 2 et 3 sont de plus soudées selon une ligne supplémentaire 27, apposée sur une extension des feuilles 2 et 3. Une ligne de fragilisation ou un simple marquage 28 peut être apposé sous la soudure 27 afin d'inciter l'utilisateur à découper le sachet selon ce marquage. La soudure supplémentaire assure une étanchéité totale.Figure 10 shows a type IIa / IIb package. In this package, the sheets 2 and 3 are furthermore welded along an additional line 27, affixed to an extension of the sheets 2 and 3. A weakening line or a simple marking 28 may be affixed under the weld 27 in order to incite the user to cut the bag according to this marking. The additional welding ensures a total seal.

L'emballage, par ses variantes IIa/IIb offre donc de nombreux avantages, par l'association de deux feuilles 2 et 3 semi-rigides formant le corps du sachet et deux films souples 10a,10b. Les caractéristiques des feuilles et films sont identiques à celle de l'emballage de type I et la description donnée en référence à la figure 1 s'applique mutatis mutandis Il en va de même des autres caractéristiques (largeur, longueur, conditions de mise en oeuvre, conditions de soudure, etc.) lorsqu'elles ne sont pas précisées spécifiquement dans un exemple d'emballage.The packaging, by its variants IIa / IIb thus offers many advantages, by the combination of two sheets 2 and 3 semi-rigid forming the body of the bag and two flexible films 10a, 10b. The characteristics of the sheets and films are identical to that of the type I package and the description given with reference to FIG. 1 applies mutatis mutandis. The same applies to the other characteristics (width, length, conditions of use). , soldering conditions, etc.) when not specifically specified in an example of packaging.

Le sachet est :

  • étanche
    • par soudure
    • par contact film/film
    • par pliage des films
    • par contact film/bouchon rapporté
    • par système ZIP lock (deux profilés, en général extrudés, qui coopèrent par emboîtement l'un dans l'autre)
    • par film pelable/repositionnable (type I)
  • ouvrable et refermable
    • par fonctionnement mécanique du système d'étanchéité (type I, II)
  • inviolable
    • soudure
      • film/feuille ou
      • feuille/feuille.
The bag is:
  • watertight
    • by welding
    • by contact film / film
    • by folding movies
    • by contact film / plug reported
    • by ZIP lock system (two sections, generally extruded, which cooperate by interlocking into one another)
    • by peelable / repositionable film (type I)
  • openable and resealable
    • by mechanical operation of the sealing system (type I, II)
  • inviolable
    • welding
      • film / sheet or
      • sheet / sheet.

Le sachet présente aussi l'avantage d'être plat (avant remplissage), ce qui facilite la manutention, diminue les volumes de conditionnement des sachets.The bag also has the advantage of being flat (before filling), which facilitates handling, decreases the packaging volumes of the bags.

Le sachet présente une épaisseur globale en général inférieure à 2 mm, de préférence inférieure à 500 µm.The bag has an overall thickness generally less than 2 mm, preferably less than 500 μm .

Les sachets sont appropriés dans tous les domaines techniques, notamment alimentaire, chimie, détergents, cosmétique; et ce pour des liquides, des poudres, des granulés ou des solides de petites tailles (par exemple des bonbons). Comme il a été indiqué plus haut, le sachet peut être à usage unique comme "poubelle".The bags are suitable in all technical fields, including food, chemistry, detergents, cosmetics; for small liquids, powders, granules or solids (eg candies). As mentioned above, the bag may be for single use as a "bin".

Enfin, on notera que les feuilles et films peuvent comprendre les additifs classiques, et être constitués de plusieurs couches, comme il est connu dans l'art. Ainsi, les films ou feuilles peuvent comprendre plusieurs couches, dont l'une est soudable.Finally, it will be appreciated that the sheets and films may comprise conventional additives, and consist of several layers, as is known in the art. Thus, the films or sheets may comprise several layers, one of which is weldable.

L'invention n'est pas limitée aux modes de réalisation représentées mais est susceptible de nombreuses améliorations aisément accessibles à l'homme de l'art, sans sortir de son cadre tel que défini par les revendications annexées.The invention is not limited to the embodiments shown but is capable of numerous improvements easily accessible to those skilled in the art without departing from its scope as defined by the appended claims.

Claims (12)

  1. A package comprising at least two sheets (2, 3) facing each other and two flexible films (10a, 10b) placed between them, characterized in that each flexible film (10a, 10b) is welded, respectively, over a portion of its length to an end of a sheet (2, 3) by a first weld (11a, 11b), the flexible films (10a, 10b) being welded together and to the sheets (2, 3) by vertical second welds (12a, 12b) extending substantially over the width of the films (10a, 10b), the first welds (11a, 11b) extending substantially between the vertical second welds (12a, 12b), and in that at least at least one of the two films being folded over the other at that end of the films on the opposite side to the first welds (11a, 11b).
  2. The package according to Claim 1, the two films being welded together by vertical third welds (12'a, 12'b), the vertical third welds (12'a, 12'b) being comprised between the second vertical welds (12a, 12b).
  3. The package according to any one of Claims 1 to 2, the two films being folded over on themselves at that end of the films on the opposite side to the welds (11a, 11b).
  4. The package according to any one of Claims 1 to 3, in which the fold formed by the film(s) is adapted to be unfolded by inserting a straw between the films (10a, 10b).
  5. The package according to any one of Claims 1 to 3, in which the fold formed by the film(s) is not adapted to be unfolded by inserting a straw.
  6. The package according to any one of Claims 1 to 5, having an additional weld (15) between the sheets (2, 3).
  7. The package according to any one of Claims I to 6, in which the flexible film is made ofPE, EVA, PP, OPP, PET or PA.
  8. The package according to any one of Claims I to 7, in which the sheets (2, 3) are semi-rigid.
  9. The package according to any one of Claims 1 to 8, in which the sheets (2, 3) and the flexible film (10a, 10b) have the following characteristics, where H is the thickness in mm and E is the equivalent modulus of the film in N.mm-2 : sheet (2, 3): H3E = 0.1 to 50 N.mm; film (10a, 10b; 16): H3E = 0.5 × 10-3 to 5 N.mm; with preferably: sheet (2, 3): H3E = 0.5 to 25 N.mm; film (10a, 10b; 16): H3E = 0.05 to 1 N.mm; with, in both cases, the relationship: film (10a, 10b; 16) H3E < sheet (2, 3) H3E.
  10. The package according to any one of Claims 1 to 9, in the form of a Doypack® or three-weld bag.
  11. A method for manufacturing a package according to any one of Claims 1 to 10, comprising the following steps:
    - insertion of a screen-film (7) between two flexible films (10a, 10b), at least one of the two films being folded back on the other at an end of the films;
    - welding of the flexible films (10a, 10b) onto two sheets (2, 3) facing each other, each flexible film being welded respectively over a portion of its length to an end of a sheet (2, 3) along a first weld (11 a, 11b), one of the two films being folded back onto the other at the opposing ends of the films to the first welds;
    - extraction of the screen-film (7);
    - optionally, welding of the films (10a, 10b) together along third vertical welds (12'a, 12'b) comprised between the second vertical welds (12a, 12b); and
    - welding of the films (10a, 10b) and the sheets (2, 3) together along the second vertical welds (12a, 12b) extending substantially over the width of the films (10a, 10b), the first welds (11a, 11b) extending substantially between the second vertical welds (12a, 12b).
  12. The method according to claim 11, in which the screen-film (7) is made of PTFE or of Teflon®-coated fabric.
EP01947549A 2000-06-22 2001-06-20 Package with strip closure system, method for making same Expired - Lifetime EP1296876B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0008041A FR2810640B1 (en) 2000-06-22 2000-06-22 PACKAGE WITH STRIP CLOSURE SYSTEM, METHOD FOR MANUFACTURING SAME
FR0008041 2000-06-22
PCT/FR2001/001935 WO2001098159A1 (en) 2000-06-22 2001-06-20 Package with strip closure system, method for making same

Publications (2)

Publication Number Publication Date
EP1296876A1 EP1296876A1 (en) 2003-04-02
EP1296876B1 true EP1296876B1 (en) 2006-03-22

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US (2) US20040022459A1 (en)
EP (1) EP1296876B1 (en)
JP (1) JP2003535778A (en)
AT (1) ATE320974T1 (en)
DE (1) DE60118192T2 (en)
DK (1) DK1296876T3 (en)
ES (1) ES2264446T3 (en)
FR (1) FR2810640B1 (en)
PT (1) PT1296876E (en)
WO (1) WO2001098159A1 (en)

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US6729473B2 (en) * 2002-06-20 2004-05-04 Cti Industries Corporation Air-evacuable bag with double-layered valve film and method for manufacturing same
US9004758B2 (en) * 2008-10-22 2015-04-14 Sealed Air Corporation (Us) Inflatable structure for packaging and associated apparatus and method
US9085405B2 (en) 2008-10-22 2015-07-21 Sealed Air Corporation (Us) Inflatable structure for packaging and associated apparatus and methods
GB201110567D0 (en) 2011-06-22 2011-08-03 Jenton Internat Ltd Method of manufacturing a valve bag
US8978693B2 (en) 2013-01-28 2015-03-17 Windcatcher Technology LLC Inflation valve allowing for rapid inflation and deflation of an inflatable object
US9321236B2 (en) 2013-06-25 2016-04-26 Sealed Air Corporation (Us) Automated inflation device

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US2799314A (en) * 1951-09-07 1957-07-16 Dreyer Andre Leak-proof containers for liquids
GB826781A (en) 1957-03-16 1960-01-20 Thomas Vale Cooper Improvements relating to mobile apparatus for spreading powdery, granular and analogous matter
GB826784A (en) 1957-03-21 1960-01-20 Mono Containers Ltd Method of making containers from flexible sheet material
GB1001873A (en) * 1961-08-25 1965-08-18 Sanders Bernard Improvements in and relating to bags
FR1327875A (en) 1962-04-11 1963-05-24 Plastic packaging and its manufacturing process
NL300500A (en) 1962-11-14 1900-01-01
US3282412A (en) * 1963-11-06 1966-11-01 Wayne V Rodgers Valved mixing container or package
FR1436217A (en) * 1965-04-15 1966-04-22 Beverage packaging bag and its manufacturing process
SE316973B (en) * 1966-09-22 1969-11-03 G Yamaguchi
US3806025A (en) * 1970-10-19 1974-04-23 T Marshall Stemming bag
DE3376637D1 (en) * 1982-10-16 1988-06-23 Johnsen Jorgensen Jaypak Bag apparatus
DE3727818A1 (en) * 1987-07-23 1989-02-02 Al Sharhan Bader A PACKAGING CONTAINER
FR2711115B1 (en) 1993-10-11 1995-12-08 High Tech Packaging France Sa Method of manufacturing a waterproof inflatable enclosure provided with a valve.
WO1995023742A1 (en) 1994-03-03 1995-09-08 Braintrust Ltd Sealed envelope, method for the manufacture thereof, and method for filling said envelope with a beverage
FR2741605B1 (en) 1995-11-29 1998-01-16 Soplaril Sa SHUTTER STRUCTURE FOR A CONTAINER, CONTAINER PROVIDED WITH SUCH STRUCTURE, AND METHOD FOR SHUTTERING THE CONTAINER
JPH09254999A (en) * 1996-03-21 1997-09-30 Seisan Nipponsha Kk Synthetic resin bag body with check valve
US6371643B2 (en) * 1999-06-02 2002-04-16 S. C. Johnson Home Storage, Inc. Multi-Layered freezer storage bag

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US20040022459A1 (en) 2004-02-05
FR2810640B1 (en) 2003-05-30
ATE320974T1 (en) 2006-04-15
DE60118192T2 (en) 2007-03-08
FR2810640A1 (en) 2001-12-28
WO2001098159A1 (en) 2001-12-27
DK1296876T3 (en) 2006-07-31
ES2264446T3 (en) 2007-01-01
PT1296876E (en) 2006-08-31
EP1296876A1 (en) 2003-04-02
US20080124007A1 (en) 2008-05-29
JP2003535778A (en) 2003-12-02
DE60118192D1 (en) 2006-05-11

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