EP1855875B1 - Method of producing a gusseted bag from a plastic film and bag thus obtained - Google Patents

Method of producing a gusseted bag from a plastic film and bag thus obtained Download PDF

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Publication number
EP1855875B1
EP1855875B1 EP06709508A EP06709508A EP1855875B1 EP 1855875 B1 EP1855875 B1 EP 1855875B1 EP 06709508 A EP06709508 A EP 06709508A EP 06709508 A EP06709508 A EP 06709508A EP 1855875 B1 EP1855875 B1 EP 1855875B1
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EP
European Patent Office
Prior art keywords
bag
walls
bellows
gussets
free
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.)
Active
Application number
EP06709508A
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German (de)
French (fr)
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EP1855875A1 (en
Inventor
Patrick Alaux
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.)
Coveris Flexibles France SA
Original Assignee
AUTOBAR FLEXIBLE PACKAGING
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Publication of EP1855875A1 publication Critical patent/EP1855875A1/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
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • 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
    • B31B2155/00—Flexible containers made from webs
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/002—Flexible containers made from webs by joining superimposed webs, e.g. with separate bottom webs
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • 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
    • B31B2170/00—Construction of flexible containers
    • B31B2170/10—Construction of flexible containers interconnected
    • 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
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • B31B70/266—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement involving gusset-forming
    • 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
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/36—Folding sheets, blanks or webs by continuously feeding them to stationary members, e.g. plates, ploughs or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8131—Making bags having interengaging closure elements

Definitions

  • the invention relates to the technical sector of plastic packaging bags, for example of the type intended for receiving animal feed.
  • these types of bags may have on their side edges bellows able to increase the capacity of the bag and improve the stability of the latter.
  • the bellows are made on the entire height of the bag.
  • the bags can be made continuously from a single plastic film.
  • the film is subjected to successive bending operations to achieve the lateral bellows between two walls.
  • the external folds of the bellows thus produced are generally assembled by welding operations.
  • the bottom of the bag is also made continuously by welding, then folded down and attached to one of the walls of the bag.
  • the bellows are made by successive bends over the entire height of the bag. It therefore appears, at level of the opening of the bag, that the end of said opening are delimited by four walls resulting from the cross section of the bellows.
  • the bag is not formed from a single plastic film subjected to successive folding operations to achieve the bellows, but from two independent films whose walls are joined by means of independent bellows reported. It is obvious that with this solution, it is conceivable to produce bags with bellows lower than the total height of the desired bag, since such bellows are made independently.
  • the patent JP 07100972 relates to a bag manufacturing method using specific means so as to form the bellows on only part of the height of the bag. This technical solution is expensive and does not allow to obtain high production rates. Another solution of this type emerges from the teaching of the document EP 1195332 .
  • the object of the invention is to remedy these disadvantages in a simple, safe, effective and rational manner.
  • the problem to be solved by the invention is to produce a bellows bag from a plastic film, the bellows being made by successive folds of said film, that is to say not reported, but in being of height less than the total height of the desired bag.
  • This technical solution required, in particular, to solve the important problem of ensuring the tight closure of the upper end of the bellows below the free part of the walls resulting from the absence of bellows.
  • the free edges of walls are assembled above the closed end at 45 ° of the bellows.
  • the various assembly operations are carried out by welding.
  • the bag obtained has lateral bellows on only part of its height, so as to leave, at a distance from the opening of the bag, a part of walls adapted to be assembled directly on one another, at their lateral edges, the upper end of the bellows being closed by an external folding zone at about 45 ° delimiting, a substantially triangular outer shape disposed between the two folds bellows.
  • the triangular external shape can be made integral with one of the folds of the corresponding bellows.
  • the bellows bag according to the invention is obtained from a plastic film (1) that is subjected to successive folding operations to achieve the side gussets (1a) between two walls (1b) and (1e). ( Figures la, 1b, 1c and 1d).
  • the external folds (1a1), (1a2) of the bellows (1a), for example up to a certain distance (a) from the opening, are assembled on only a part of the desired height of the bag. (the).
  • the assembly of the pleats (1a1) and (1a2) of each bellows (1a) can be performed for example by a welding operation ( figure 2 ).
  • the bellows (1a) are separated to the level of their assembly zone so as to form a free portion of the bellows (1a3) and a free portion of the walls (1b1), (1c1).
  • this separation of the bellows (1a) to the corresponding weld line (S) may result from a simple section of each of the folds (1a1), (1a2) of each bellows.
  • Each free portion of the bellows (1a3) is then subjected to an operation capable of ensuring the upper transverse closure of the bellows from the end of the assembly line (S) of the outer pleats (1a1), (1a2) of each bellows (1a).
  • These transverse closing operations of the upper ends of the bellows are performed after having folded down, at least one of the free parts of the wall (1b1) to release the free portion of the bellows (1a3) ( figure 3 ).
  • each free portion of the bellows (1a3) is subjected to a torsion and folding movement at 45 ° in overflow of the lateral edges of the walls ( figure 4 ).
  • This 45 ° twist and bend movement (1a4) ensures the closure of each bellows.
  • the overflowing portion resulting from said twisting and folding movements is then cut off ( figure 5 ).
  • the free wall portion (1b1) is folded upwards in superposition of the closed end at 45 ° bellows. It is then possible to assemble the lateral edges of the two free walls (1b1), (1c1) by a weld line (S2) for example above the closed upper ends (1a4) of the bellows ( figure 6 ).
  • the bag obtained has lateral bellows (1a) on only a part of the total height of the bag, so as to leave, at a certain distance (a) from the opening of the bag, a free wall portion (1b1) and (1c1).
  • each bellows (2a) is closed by the 45 ° internal folding zone (1a4) delimiting a substantially triangular shape.
  • This triangular shape is disposed between the two folds (1a1), (1a2) of the corresponding bellows (1a). Note that this triangular shape can be made integral (by welding for example) of one of the folds of the corresponding bellows.
  • the bag After filling in particular, the bag is closed in a sealed manner at the upper horizontal edge of the free parts of walls (1b1), (1c1). Also note that one of the walls (1b1) for example, can be equipped with a system of opening and closing at will ZIP® type closure ECLAIR®, ...

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)

Abstract

The invention relates to a bag comprising side gussets (1a) which extend along only part of the height thereof, such as to form walls (1b1), (1c1) at a certain distance (a) from the opening of the bag, which can be assembled directly to one another along the side edges thereof. The upper end of the gussets is closed by means of an external fold area which is folded at 45° such as to define an essentially-triangular shape (1a4) that is disposed between the two folds of the gussets.

Description

L'invention se rattache au secteur technique des sacs d'emballage en matière plastique, par exemple du type de ceux destinés à recevoir de la nourriture pour animaux.The invention relates to the technical sector of plastic packaging bags, for example of the type intended for receiving animal feed.

D'une manière avantageuse, parfaitement connue pour l'homme du métier, ces types de sacs peuvent présenter sur leurs bords latéraux des soufflets aptes à augmenter la capacité du sac et à améliorer la stabilité de ce dernier.Advantageously, well known to those skilled in the art, these types of bags may have on their side edges bellows able to increase the capacity of the bag and improve the stability of the latter.

Généralement, les soufflets sont réalisés sur la totalité de la hauteur du sac.Generally, the bellows are made on the entire height of the bag.

Différents procédés de fabrication peuvent être envisagés. Par exemple, d'une manière courante, les sacs peuvent être réalisés en continu à partir d'un seul film en matière plastique. Le film est soumis à des opérations de pliages successifs pour réaliser les soufflets latéraux entre deux parois. Les plis externes des soufflets ainsi réalisés sont assemblés généralement par des opérations de soudure. Le fond du sac est également réalisé en continu par soudure, puis rabattu et fixé sur l'une des parois du sac.Different manufacturing processes can be envisaged. For example, in a current manner, the bags can be made continuously from a single plastic film. The film is subjected to successive bending operations to achieve the lateral bellows between two walls. The external folds of the bellows thus produced are generally assembled by welding operations. The bottom of the bag is also made continuously by welding, then folded down and attached to one of the walls of the bag.

De telles dispositions ne sont pas décrites dans le détail car parfaitement connues pour un homme du métier.Such provisions are not described in detail because they are well known to those skilled in the art.

Dans cette forme de réalisation, les soufflets sont donc réalisés par pliages successifs sur la totalité de la hauteur du sac. Il apparaît donc, au niveau de l'ouverture du sac, que les extrémité de ladite ouverture sont délimitées par quatre parois résultant de la section transversale des soufflets.In this embodiment, the bellows are made by successive bends over the entire height of the bag. It therefore appears, at level of the opening of the bag, that the end of said opening are delimited by four walls resulting from the cross section of the bellows.

Ces dispositions imposent d'utiliser des moyens spécifiques pour assurer la fermeture étanche du sac. Certaines difficultés peuvent également apparaître pour équiper la partie supérieure du sac, au niveau de son ouverture, de moyens d'ouverture et de fermeture temporaire du type ZIG®, fermeture ECLAIR®, ...These provisions require the use of specific means to ensure the tight closure of the bag. Some difficulties may also appear to equip the upper part of the bag, at its opening, means of opening and closing temporarily type ZIG® ECLAIR® closure, ...

Pour remédier à ces inconvénients, on a proposé de réaliser des sacs en matière plastique dont les soufflets latéraux s'étendent sur une partie seulement de la hauteur du sac, à une certaine distance de l'ouverture dudit sac. Il en résulte qu'au-dessus des soufflets, les extrémités latérales de l'ouverture sont constituées seulement par deux épaisseurs de parois.To overcome these disadvantages, it has been proposed to produce plastic bags whose lateral bellows extend over only a portion of the height of the bag, at a distance from the opening of said bag. As a result, above the bellows, the lateral ends of the opening consist of only two thicknesses of walls.

Ce type de sac ressort, par exemple, de l'enseignement du document EP 1.250.999 qui concerne un procédé de fabrication pour des sacs à soufflets. Toutefois, le procédé décrit dans ce document relève d'une conception à la base de réalisation de sacs totalement différente.This type of bag emerges, for example, from the teaching of the document EP 1.250.999 relating to a manufacturing method for bellows bags. However, the process described in this document is based on a totally different concept of bag design.

En effet, le sac n'est pas formé partir d'un seul film en matière plastique soumis à des opérations successives de pliage pour réaliser les soufflets, mais à partir de deux films indépendants dont les parois sont réunies par l'intermédiaire de soufflets indépendants rapportés. Il est évident qu'avec cette solution, il est envisageable de réaliser des sacs avec des soufflets de hauteur inférieure à la hauteur totale du sac souhaitée, étant donné que de tels soufflets sont réalisés d'une manière indépendante.Indeed, the bag is not formed from a single plastic film subjected to successive folding operations to achieve the bellows, but from two independent films whose walls are joined by means of independent bellows reported. It is obvious that with this solution, it is conceivable to produce bags with bellows lower than the total height of the desired bag, since such bellows are made independently.

On conçoit cependant que le fait de rapporter les soufflets diminue, d'une manière significative, les cadences de production.It is conceivable, however, that reporting the bellows significantly reduces production rates.

Le brevet JP 07100972 concerne un procédé de fabrication de sacs mettant en oeuvre des moyens spécifiques de manière à former le soufflet sur une partie seulement de la hauteur du sac. Cette solution technique est onéreuse et ne permet pas d'obtenir des cadences de production élevées. Une autre solution de ce type ressort de l'enseignement du document EP 1195332 .The patent JP 07100972 relates to a bag manufacturing method using specific means so as to form the bellows on only part of the height of the bag. This technical solution is expensive and does not allow to obtain high production rates. Another solution of this type emerges from the teaching of the document EP 1195332 .

L'invention s'est fixée pour but de remédier à ces inconvénients d'une manière simple, sûre, efficace et rationnelle.The object of the invention is to remedy these disadvantages in a simple, safe, effective and rational manner.

Le problème que se propose de résoudre l'invention est de réaliser un sac à soufflets à partir d'un film en matière plastique, les soufflets étant réalisés par des pliages successifs dudit film, c'est-à-dire non rapportés, mais en étant de hauteur inférieure à la hauteur totale du sac désiré. Cette solution technique a nécesité notamment, de résoudre le problème posé important d'assurer la fermeture étanche de l'extrémité supérieure des soufflets en dessous de la partie libre des parois résultant de l'absence de soufflet.The problem to be solved by the invention is to produce a bellows bag from a plastic film, the bellows being made by successive folds of said film, that is to say not reported, but in being of height less than the total height of the desired bag. This technical solution required, in particular, to solve the important problem of ensuring the tight closure of the upper end of the bellows below the free part of the walls resulting from the absence of bellows.

Pour résoudre un tel problème, il a été conçu un procédé de fabrication selon lequel :

  • on soumet le film à des opérations de pliages successifs pour réaliser les soufflets latéraux entre deux parois;
  • on réalise le fond du sac ;
  • on assemble, sur une partie de la hauteur, des plis externes des soufflets jusqu'à une certaine distance de l'ouverture du sac ;
  • on désolidarise les soufflets jusqu'au niveau de leur zone d'assemblage, de manière à former une partie libre de soufflets et une partie libre de parois;
  • on rabat vers le bas, au moins l'une des parties libres des parois, pour dégager la partie libre des soufflets ;
  • on soumet chaque partie libre des soufflets à un mouvement de torsion et de pliage à 45°, en débordement des bords latéraux des parois correspondant à la fermeture de chaque soufflet ;
  • on coupe la partie libre et débordante des soufflets résultant dudit mouvement de torsion et de pliage ;
  • on rabat vers le haut la partie libre des parois, en superposition de l'extrémité fermée à 45° des soufflets ;
  • on assemble les bords libres des parois du sac selon la distance précitée.
To solve such a problem, it has been conceived a manufacturing method according to which:
  • the film is subjected to successive bending operations to achieve the lateral bellows between two walls;
  • the bottom of the bag is made;
  • on a part of the height, external folds of the bellows are assembled to a certain distance from the opening of the bag;
  • the bellows are separated to the level of their assembly zone, so as to form a free portion of bellows and a free portion of walls;
  • flap down, at least one of the free parts of the walls, to clear the free portion of the bellows;
  • each free portion of the bellows is subjected to a torsion and folding movement at 45 °, overflowing the lateral edges of the walls corresponding to the closure of each bellows;
  • the free and overhanging portion of the bellows resulting from said twisting and folding movement is cut off;
  • the free part of the walls is folded upwards, in superposition of the closed end at 45 ° of the bellows;
  • the free edges of the walls of the bag are assembled according to the above-mentioned distance.

Suivant une autre caractéristique, on réalise l'assemblage des bords libres de parois, au-dessus de l'extrémité fermée à 45° des soufflets. On réalise les différentes opérations d'assemblage, par soudure.According to another feature, the free edges of walls are assembled above the closed end at 45 ° of the bellows. The various assembly operations are carried out by welding.

Avantageusement, on équipe la partie supérieure du sac, au niveau de son ouverture, d'un système de fermeture.Advantageously, we equip the upper part of the bag, at its opening, a closure system.

Compte tenu des caractéristiques à la base du procédé selon l'invention, le sac obtenu présente des soufflets latéraux sur une partie de sa hauteur seulement, de manière à laisser subsister, à une certaine distance de l'ouverture du sac, une partie de parois aptes à être assemblées directement l'une sur l'autre, au niveau de leurs bords latéraux, l'extrémité supérieure de soufflets étant fermée par une zone de pliage externe à environ 45° délimitant, une forme externe sensiblement triangulaire disposée entre les deux plis des soufflets. La forme externe triangulaire peut être rendue solidaire de l'un des plis du soufflet correspondant.Given the basic characteristics of the process according to the invention, the bag obtained has lateral bellows on only part of its height, so as to leave, at a distance from the opening of the bag, a part of walls adapted to be assembled directly on one another, at their lateral edges, the upper end of the bellows being closed by an external folding zone at about 45 ° delimiting, a substantially triangular outer shape disposed between the two folds bellows. The triangular external shape can be made integral with one of the folds of the corresponding bellows.

L'invention est exposée ci-après plus en détail à l'aide des figures des dessins annexés dans lesquels :

  • les figures la, 1b, 1c et ld sont des vues à caractère purement schématique montrant les principales phases du procédé de réalisation d'un sac à partir d'un film en matière plastique ;
  • la figure 2 est une vue en perspective du sac plastique dans lequel les plis externes des soufflets sont soudés sur une partie seulement de la hauteur totale du sac à une distance déterminée de l'ouverture de ce dernier ;
  • la figure 3 est une vue de face du sac après avoir désolidarisé les soufflets jusqu'au niveau de leur zone d'assemblage, de manière à former une partie libre du soufflet et une partie libre de paroi dont l'une d'entre elles est représentée rabattue vers le bas ;
  • les figures 4, 5 et 6 sont des vues de face montrant, à partir de la figure 3, les différentes phases du procédé de réalisation du sac.
  • la figure 7 est une vue en perspective du sac résultant du procédé selon les figures 3, 4, 5 et 6 ;
  • la figure 8 montre le sac ouvert après remplissage;
The invention is described below in more detail with reference to the figures of the accompanying drawings, in which:
  • FIGS. 1a, 1b, 1c and 1d are purely schematic views showing the main phases of the method of producing a bag from a plastic film;
  • the figure 2 is a perspective view of the plastic bag in which the outer folds of the bellows are welded to only a portion of the total height of the bag at a determined distance from the opening thereof;
  • the figure 3 is a front view of the bag after separating the bellows to the level of their assembly area, so as to form a free portion of the bellows and a free wall portion, one of which is shown folded towards the bottom ;
  • the Figures 4, 5 and 6 are front views showing, from the figure 3 , the different phases of the method of producing the bag.
  • the figure 7 is a perspective view of the bag resulting from the process according to the Figures 3, 4, 5 and 6 ;
  • the figure 8 shows the open bag after filling;

Comme indiqué, d'une manière parfaitement connue pour un homme du métier, le sac à soufflets selon l'invention est obtenu à partir d'un film en manière plastique (1) que l'on soumet à des opérations de pliages successifs pour réaliser les soufflets latéraux (1a) entre deux parois (1b) et (1e). (figures la, 1b, 1c et 1d).As indicated, in a manner perfectly known to those skilled in the art, the bellows bag according to the invention is obtained from a plastic film (1) that is subjected to successive folding operations to achieve the side gussets (1a) between two walls (1b) and (1e). (Figures la, 1b, 1c and 1d).

Ces dispositions sont parfaitement connues pour un homme du métier et ne sont pas décrites en détail. Il en est de même en ce qui concerne la réalisation du fond (1d) qui peut résulter d'un assemblage par soudure à l'extrémité inférieure des deux parois (1a) et (1b) et d'un rabattement sur l'une des parois (1a) ou (1b).These arrangements are well known to those skilled in the art and are not described in detail. It is the same with regard to the realization of the bottom (1d) which can result from a welded joint at the lower end of the two walls (1a) and (1b) and a drawdown on one of the walls (1a) or (1b).

Selon l'invention, on assemble, sur une partie seulement de la hauteur désirée du sac, les plis externes (1a1), (1a2) des soufflets (1a), par exemple jusqu'à une certaine distance (a) de l'ouverture (le). D'une manière classique, l'assemblage des plis (1a1) et (1a2) de chaque soufflet (1a), peut être effectué par exemple par une opération de soudure (figure 2).According to the invention, the external folds (1a1), (1a2) of the bellows (1a), for example up to a certain distance (a) from the opening, are assembled on only a part of the desired height of the bag. (the). In a conventional manner, the assembly of the pleats (1a1) and (1a2) of each bellows (1a) can be performed for example by a welding operation ( figure 2 ).

Dans une autre étape du procédé selon l'invention, on désolidarise les soufflets (1a) jusqu'au niveau de leur zone d'assemblage de manière à former une partie libre des soufflets (1a3) et une partie libre des parois (1b1), (1c1). Par exemple, cette désolidarisation des soufflets (1a) jusqu'à la ligne de soudure correspondante (S), peut résulter d'une simple coupe de chacun des plis (1a1), (1a2) de chaque soufflet.In another step of the method according to the invention, the bellows (1a) are separated to the level of their assembly zone so as to form a free portion of the bellows (1a3) and a free portion of the walls (1b1), (1c1). For example, this separation of the bellows (1a) to the corresponding weld line (S), may result from a simple section of each of the folds (1a1), (1a2) of each bellows.

On soumet ensuite chaque partie libre du soufflet (1a3) à une opération apte à assurer la fermeture transversale supérieure des soufflets à partir de l'extrémité de la ligne d'assemblage (S) des plis externes (1a1), (1a2) de chaque soufflet (1a). Ces opérations de fermeture transversale des extrémités supérieures des soufflets sont réalisées après avoir rabattu vers le bas, au moins l'une des parties libres de la paroi (1b1) pour dégager la partie libre des soufflets (1a3) (figure 3).Each free portion of the bellows (1a3) is then subjected to an operation capable of ensuring the upper transverse closure of the bellows from the end of the assembly line (S) of the outer pleats (1a1), (1a2) of each bellows (1a). These transverse closing operations of the upper ends of the bellows are performed after having folded down, at least one of the free parts of the wall (1b1) to release the free portion of the bellows (1a3) ( figure 3 ).

A partir de cette conception, différentes solutions techniques peuvent être envisagées.From this conception, different technical solutions can be envisaged.

Dans la forme de réalisation illustrée (figures 4, 5 et 6), on soumet chaque partie libre des soufflets (1a3) à un mouvement de torsion et de pliage à 45° en débordement des bords latéraux des parois (figure 4). Ce mouvement de torsion et de pliage à 45° (1a4), assure la fermeture de chaque soufflet.In the illustrated embodiment ( Figures 4, 5 and 6 ), each free portion of the bellows (1a3) is subjected to a torsion and folding movement at 45 ° in overflow of the lateral edges of the walls ( figure 4 ). This 45 ° twist and bend movement (1a4) ensures the closure of each bellows.

On coupe ensuite la partie débordante résultant desdits mouvements de torsion et de pliage (figure 5). La partie libre de paroi (1b1) est rabattue vers le haut en superposition de l'extrémité fermée à 45° des soufflets. Il est alors possible d'assembler les bords latéraux des deux parois libres (1b1), (1c1) par une ligne de soudure (S2) par exemple au-dessus des extrémités supérieures fermées (1a4) des soufflets (figure 6).The overflowing portion resulting from said twisting and folding movements is then cut off ( figure 5 ). The free wall portion (1b1) is folded upwards in superposition of the closed end at 45 ° bellows. It is then possible to assemble the lateral edges of the two free walls (1b1), (1c1) by a weld line (S2) for example above the closed upper ends (1a4) of the bellows ( figure 6 ).

Compte tenu des différentes étapes du procédé, le sac obtenu présente des soufflets latéraux (1a) sur une partie seulement de la hauteur totale du sac, de manière à laisser subsister, à une certaine distance (a) de l'ouverture du sac, une partie de paroi libre (1b1) et (1c1).Given the different steps of the method, the bag obtained has lateral bellows (1a) on only a part of the total height of the bag, so as to leave, at a certain distance (a) from the opening of the bag, a free wall portion (1b1) and (1c1).

Ces deux parties libres de parois (1b1) et (1c1) peuvent être assemblées au niveau de leur extrémité latérale par des opérations de soudure (S2) par exemple, et cela sur deux épaisseurs seulement. L'extrémité supérieure de chaque soufflet (2a) est fermée par la zone de pliage interne à 45° (1a4) délimitant une forme sensiblement triangulaire.These two free parts of walls (1b1) and (1c1) can be assembled at their lateral end by welding operations (S2) for example, and this on two thicknesses only. The upper end of each bellows (2a) is closed by the 45 ° internal folding zone (1a4) delimiting a substantially triangular shape.

Cette forme triangulaire est disposée entre les deux plis (1a1), (1a2) du soufflet correspondant (1a). A noter que cette forme triangulaire peut être rendue solidaire (par soudure par exemple) de l'un des plis du soufflet correspondant.This triangular shape is disposed between the two folds (1a1), (1a2) of the corresponding bellows (1a). Note that this triangular shape can be made integral (by welding for example) of one of the folds of the corresponding bellows.

On renvoie à la figure 8 des dessins qui montre le sac ouvert et rempli de produits. Sur cette figures, on voit l'extrémité des soufflets fermés selon un pliage d'environ 45°.We refer to the figure 8 drawings that shows the bag open and filled with products. In this figure, we see the end of the bellows closed according to a fold of about 45 °.

Après remplissage notamment, le sac est fermé d'une manière étanche au niveau du bord supérieur horizontal des parties libres de parois (1b1), (1c1). A noter également que l'une des parois (1b1) par exemple, peut être équipée d'un système d'ouverture et de fermeture à volonté du type ZIP®, fermeture ECLAIR®, ...After filling in particular, the bag is closed in a sealed manner at the upper horizontal edge of the free parts of walls (1b1), (1c1). Also note that one of the walls (1b1) for example, can be equipped with a system of opening and closing at will ZIP® type closure ECLAIR®, ...

Les avantages ressortent bien de la description, en particulier on souligne et on rappelle la possibilité de réaliser, à partir d'un film en matière plastique, directement des soufflets et selon une hauteur inférieure à la hauteur totale du sac, de manière à n'avoir que deux épaisseurs de parois au niveau de la zone de fermeture du sac.The advantages are apparent from the description, in particular it is emphasized and recalled the possibility of making, from a plastic film, directly bellows and at a height less than the total height of the bag, so n ' have only two thicknesses of walls at the closing area of the bag.

Claims (4)

  1. Process for the manufacture of a gusseted bag from a film (1) of plastics material:
    - the film (1) is subjected to successive folding operations to create lateral gussets (1a) between two walls (1b) and (1c);
    - the bottom (1d) is created;
    - at one part of its height, external folds (1a1), (1a2) of the gussets (1a) are assembled up to a certain distance (a) of the bag's opening;
    - the gussets (1a) are detached up to their area of assembly, so as to form a free part of the gussets (1a3) and a free part of the walls (1b1), (1c1);
    - at least one of the free parts (1b1) of the walls is folded down to release the free part (1a3) of the gussets;
    - each free part (1a3) of the gussets is subjected to a movement of twisting and folding at 45°, to project beyond the side edges of the walls and seal each gusset;
    - the free and projecting part of the gussets resulting from the said twisting and folding movement is cut;
    - the free part (1b1) of the walls is folded upwards, superimposed upon the 45° sealed end of the gussets;
    - the free edges (1b1), (1c1) of the bag walls are assembled at the above-mentioned distance.
  2. Process according to claim 1, characterised in that the free edges of the walls (1b1), (1c1) are assembled above the 45° sealed end of the gussets.
  3. Process according to either of claims 1 to 2, characterised in that the different assembly operations are performed by welding.
  4. Process according to any of claims 1 to 3, characterised in that the top part of the bag, at its opening, is provided with a sealing system.
EP06709508A 2005-03-02 2006-02-13 Method of producing a gusseted bag from a plastic film and bag thus obtained Active EP1855875B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0550547A FR2882683B1 (en) 2005-03-02 2005-03-02 METHOD FOR MANUFACTURING A BRAKE BAG FROM A PLASTIC FILM AND THE BAG OBTAINED
PCT/FR2006/050129 WO2006092517A1 (en) 2005-03-02 2006-02-13 Method of producing a gusseted bag from a plastic film and bag thus obtained

Publications (2)

Publication Number Publication Date
EP1855875A1 EP1855875A1 (en) 2007-11-21
EP1855875B1 true EP1855875B1 (en) 2012-01-11

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EP06709508A Active EP1855875B1 (en) 2005-03-02 2006-02-13 Method of producing a gusseted bag from a plastic film and bag thus obtained

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US (1) US20080205801A1 (en)
EP (1) EP1855875B1 (en)
AR (1) AR056932A1 (en)
AT (1) ATE540805T1 (en)
CA (1) CA2599859A1 (en)
ES (1) ES2379382T3 (en)
FR (1) FR2882683B1 (en)
WO (1) WO2006092517A1 (en)

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JP6527081B2 (en) 2012-08-06 2019-06-05 ザ プロクター アンド ギャンブル カンパニーＴｈｅ Ｐｒｏｃｔｅｒ ＆ Ｇａｍｂｌｅ Ｃｏｍｐａｎｙ Method of making flexible container
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KR101712881B1 (en) 2015-07-06 2017-03-07 주식회사 드림 Self-standing type package

Also Published As

Publication number Publication date
FR2882683B1 (en) 2008-08-15
CA2599859A1 (en) 2006-09-08
EP1855875A1 (en) 2007-11-21
US20080205801A1 (en) 2008-08-28
FR2882683A1 (en) 2006-09-08
ATE540805T1 (en) 2012-01-15
ES2379382T3 (en) 2012-04-25
AR056932A1 (en) 2007-11-07
WO2006092517A1 (en) 2006-09-08

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