WO1986005442A1 - Method for fabricating bags made of flexible material, particularly plastic, device for implementing such method and bags obtained thereby - Google Patents

Method for fabricating bags made of flexible material, particularly plastic, device for implementing such method and bags obtained thereby Download PDF

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Publication number
WO1986005442A1
WO1986005442A1 PCT/FR1986/000082 FR8600082W WO8605442A1 WO 1986005442 A1 WO1986005442 A1 WO 1986005442A1 FR 8600082 W FR8600082 W FR 8600082W WO 8605442 A1 WO8605442 A1 WO 8605442A1
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WO
WIPO (PCT)
Prior art keywords
bars
bag
opening
bellows
edges
Prior art date
Application number
PCT/FR1986/000082
Other languages
French (fr)
Inventor
André Jean Paul ALLEGRE
Original Assignee
Decomatic
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Decomatic filed Critical Decomatic
Publication of WO1986005442A1 publication Critical patent/WO1986005442A1/en

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Classifications

    • 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
    • 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
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/864—Mounting separate handles on bags, sheets or webs

Definitions

  • the present invention relates to a process for manufacturing flexible plastic bags or possibly paper and, more specifically, so-called bellows bags.
  • the invention also relates to a device for implementing this process as well as to the bags obtained by this process.
  • the flexible plastic bags with bellows which are intended for the packaging and transport of various articles, for example clothing articles after their retail sale, are generally made from a sheath made of plastic which is scrolled in a flattened form and which is cut so as to form sheath sections whose lower opening is closed by welding and whose upper opening receives two rigid or semi-rigid bars internally provided each of a handle, the sheath being folded before cutting and welding, so as to form on the two edges parallel to the longitudinal direction of the sheath, each time a bellows intended to reduce the apparent width of the bag while giving it a capacity sufficient reception.
  • the bars for their part, have an elongated longitudinal shape whose length corresponds substantially to the width of the folded bag with its bellows.
  • the bars and possibly the handles that they carry, include means for mutual locking by snap-fastening allowing a closing and an opening of the bag.
  • the manufacture of bars is carried out by plastic injection molding in a specially designed mold so as to be able to mold, at the same time, the two bars (with their handles) from the same bag, the two bars being present in the mold side by side at a short distance with the handles extending on both sides.
  • an operator or a mechanism grabs the two bars still connected by the fracturable injection bridges while they are still hot, to fold them against each other so as to interpenetrate the snap-on locking means with which the bars and possibly the handles are provided.
  • Such an operation does not present any particular difficulties in the case of bags without bellows.
  • British patent 1,367,952 describes a method and a device for welding plastic bars provided with handles inside the opening of bags comprising bellows. No details are given on the length of the bars and this document simply discloses the idea of automatically carrying out the insertion of bars which was carried out manually. This device was never implemented and we continued to place the bars manually in the bags.
  • French patent 2,027,997 describes a process allowing the welding of the bars inside the opening of a bellows bag, the bars having a length which is practically equal to the width of the bag. To carry out this operation, this document provides for making notches or cuts in the bellows so as to obtain extensions of the flat faces of the bag and not to be hampered by the presence of the bellows. Such a process requires an additional operation on the bag and leads to a weakening of its solidity.
  • German patent 1,937,480 describes a device for positioning a bar in which the length of the bars is sufficiently short so as not to be obstructed by the bellows.
  • the present invention proposes to remedy these drawbacks and to provide a method of manufacturing bags of flexible material such as plastic or paper of the bellows type, provided with bars with handles, which eliminates the manual intervention hitherto necessary and therefore reduces the cost price.
  • Another objective of the invention is to provide a device for the implementation of this method which is simple and reliable.
  • Yet another objective of the invention is to eliminate the operations of assembling bars at the outlet of the mold, thereby increasing the rate of molding and eliminating an operator or a mechanism.
  • the subject of the invention is a method of manufacturing bags made of flexible material, in particular plastic or paper, having lateral bellows, in which a flattened sheath of plastic is produced, the two edges of the sheath are folded inwards so as to form two lateral bellows, the sheath is cut into individual bags whose bottom is welded, there is produced by injection molding, for each bags, two bars each carrying a handle as well as closure means capable of cooperating with each other on the bars whose length is clearly greater than the distance separating the two bellows, and the bars are fixed by welding or gluing by their external faces against the internal edges of the opening of the bag, characterized in that one brings separately the two bars opposite the opening and, separating the two edges of the opening from one another, the two bars arranged simultaneously are introduced s parallel to each other but separated by a space allowing the passage of the two bellows between the bars, after which the internal faces of the two edges of the bag are fixed against their respective bars.
  • the method is implemented continuously with the formation of the bag from the sheath and the bars are advantageously presented in stacks, for example, from reserves or bar chargers arranged symmetrically with respect to the plane of the bag. .
  • action is preferably taken by suction on the external faces of the two edges.
  • One can, simultaneously, tighten the bellows by exerting on their internal top a push in the plane of symmetry of the bag.
  • the positioning and welding of the bars in the opening of the bag can be carried out at the same time as the cutting and welding of the bottom of the bag.
  • the method according to the invention results in a high-speed production of bags, for example, of the order of 20 bags per minute, and this under conditions of very high reliability, and eliminating the need to collect the two bars of the same bag after they have been molded, which simplifies the mold and increases its production rate while eliminating the work station or the mechanism responsible for bringing the two bars out of the mold .
  • the invention also relates to a device for the implementation of this method, characterized in that it comprises means making it possible to present a sheath or a bag already cut from the sheath in a flattened position, means, preferably by suction, making it possible to separate, by a certain distance, the two edges of the opening of the bag and to unfold, at least partially the bellows, means for presenting, on either side of the plane of symmetry of the bag, two bars arranged in parallel and spaced from each other by a sufficient distance so as no longer to be hampered by the presence of the bellows, and introduce said bars into the opening thus formed in the vicinity of the internal faces of the corresponding edges of the bag, and means for welding or gluing said edges against the bars.
  • the means presenting and maintaining the bars in the opening of the bag are designed so as to allow, once the bars are placed in the opening, the bringing together of the two bars towards each other, and possibly the snap of their mutual assembly means, for example, under the effect of welding jaws, which makes it unnecessary to insert a support piece between the two bars during welding, and then authorizes the delivery of a closed bag .
  • the presentation means of the bars are preferably supplied by two bar loaders arranged symmetrically with respect to the plane of symmetry of the bag and associated with means such as movable fingers to release the end bars, facing each other, from the two chargers and the bring it into the opening of the bag.
  • the bars can be made so that they can be snapped against each other to form two stacks that are stable by themselves, which eliminates the need for chargers.
  • the device preferably comprises a station ensuring both the cutting and the welding of the bottom of the bag at the same time as the positioning and the welding of the strips and, in this case, a bag position detector is advantageously provided such as, for example, an optical sensor sensitive to an inscription repetitively disposed on the sheath, which can advantageously be presented on a coil or even be fabricated in place, in the case where it is produced by folding and welding a edge.
  • the bags can be evacuated advantageously by planning to bring the bag or the sheath, during the positioning and welding of the bars, on a table which is capable of tilting after the implementation of the various operations so the bag slides by its own gravity into a receiving device allowing automatic counting and stacking.
  • bars with completely conventional handles provided with lugs and mutual snap-on holes it is also possible to provide for giving the snap-on hole a dimension, in the direction of the length of the strip, greater than the corresponding dimension of the lug or male latching element so as to allow, even in the event of differential withdrawal of the cooling strips after molding, assembly by latching of the bars and the invention also relates to bags having such bars.
  • FIG. 1 represents a view of a bag manufactured according to the invention
  • FIG. 2 represents a view of a bag with a variant of bars according to the invention
  • FIG. 3 represents a schematic elevation view of a device according to the invention
  • FIG. 4 diagrammatically represents the opening of the bag front view at the time of insertion of the bars
  • Figure 5 shows a view similar to Figure 4, in vertical section.
  • the bag shown in Figure 1 has two main faces 1 and two side bellows 2 with a bottom 3 closed by welding.
  • the opening of the bag has, inside, two stiffening bars 4 of molded plastic material provided with their handles 5 as well as snap-on assembly means such as lugs 6 and holes 7. It is thus possible to bring the two bars with their handles, one from the other and, making the pins penetrate the holes, assemble the bars and handles to each other and close the bag.
  • FIG. 2 it can be seen that the lugs and circular holes in FIG. 1 can be replaced by dry lugs square or rectangular tion 8 penetrating into rectangular or oblong holes 9 of greater length, which allows closing even if the distances between pins and holes of the same bar are slightly different from the corresponding centers of the other bar.
  • the device for implementing the method according to the invention comprises a coil 10 supporting a winding of a flexible plastic sheath 11 which is unwound under tension by being returned on a roller tension 12 to a bellows forming station 13 of a completely conventional type in which the two bellows 2 are formed, on the two sides of the sheath 11.
  • the sheath can come from extrusion or be obtained by folding and welding of a film.
  • This bellows training station 13 will not be described in more detail, being of a very usual type.
  • the sheath with its bellows passes through the hot air heating device 14, of an equally conventional type, after which, the sheath, with its bellows, passes over a set of three cylinders 15, of which a cylinder is recalled with an effort on the other two so as to ensure fixing of the folds, previously heated, of the bellows.
  • the sheath with its bellows then passes into a storage area 16 of a usual type whose variable length makes it possible to tune the continuous and step-by-step rhythms of the parts of the device upstream and downstream of the area 16.
  • rollers 18 then return the sheath to a table 19 capable of pivoting between the position shown in solid lines and the position shown in broken lines around an axis 20 by virtue of the traction of a jack 21.
  • the table 19 comprises in particular two rigid crosspieces 22, 23.
  • the cross member 23, the position of which can be adjusted by a jack 30, is integral with the station 31 for positioning and welding bars 32 similar to bars 4 but provided with a rib 33 and a handle of reinforced thickness 34.
  • This station comprises a plate 35 integral with the cross-member 23 and ending with a porous transverse suction element 36 followed by a fixed heating jaw 37. It also comprises a movable upper assembly having, at the end of a suitable support, an elongated suction element 38 and a heating jaw 39, the assembly being actuated by a jack 40.
  • the distance between the welding jaw 27 and the set of jaws 37, 39 corresponds to the length of the bag and can be adapted to bags of different lengths by acting on the jack 30.
  • the bars 32 are freely stacked in two chargers 41, 42 arranged symmetrically on either side of a horizontal plane 43 passing a little above the plate 35.
  • These chargers have, at their two opposite ends, means dispensing individual bars comprising, for example, rotary members with pins and fingers pushed back by jacks 44, 45.
  • the control of these mechanisms is ensured so that the loaders simultaneously present an upper bar and a lower bar each arranged horizontally , the two bars being parallel and located in the spacing shown in FIG. 4.
  • a bar gripping mechanism is advantageously provided between the two magazines 41 and 42. This mechanism not only is capable of presenting the bars horizontally and parallel in the position shown in Figure 4, but also to move the assembly ble of these corx bars horizontally in the direction of the jaws 37, 39, with their associated suction elements 36, 38.
  • the bars can be temporarily secured to one another by snap-fastening, one can do without the chargers and provide, for example, simple means for guiding the stacks of bars.
  • the bar gripping mechanism which grasps the two bars coming from the loaders, can, for example, have two crews movable simultaneously in the horizontal plane towards and away from the bag and movable in opposite directions in the vertical direction for s '' approach or move away from each other.
  • Each crew can comprise, for example, a first bar engaging in the female part of the rib 33 by marrying its internal shape without exceeding the bar and a second bar fitting to the male part of the rib 33, the two bars being clamped towards each other in the manner of jaws which, when clamped, hold the bar in the horizontal position shown in FIG. 5.
  • the operation is as follows: The sheath 11 with its bellows is delivered to the table 19 by the rollers 18 and slides horizontally until its end is disposed opposite the jaws 37, 39, in the axial position shown in the figure 5.
  • the obtaining of this position that is to say the stopping of the movement of the rollers 18, is controlled by the position detector 29.
  • the rollers 18 being stopped, the sheath is stationary while the storage area 16 supports the sheath part which is located upstream and which, coming from the reel 10 and passing through the stations 13, 14 and 15, runs continuously.
  • the devices 26 and 28 are actuated and cause the cutting of a section of sheath which must form the bag as well as the welding of the bottom 3 of the bag by the heating jaw 27.
  • the jack 40 causes the descent of the 'set of elements 38, 39 so that the end of the bag intended to form the opening of the bag is caught between the elements 36, 37, on the one hand, and the elements 38, 39, on the other hand.
  • the elements 36 and 38 are connected to a source of vacuum and the edges of the bag are applied by suction against these elements and, consequently, against the jaws 37 and 39.
  • the jack 40 then causes movement in the opposite direction until the position shown in FIGS. 4 and 5 is obtained in which the two edges of the sheath 11 forming the bag are spaced from one another, the bellows taking the semi-open position shown in FIG. 4.
  • the delivery mechanisms of the magazines 41 and 42 took two bars and brought them into a position spaced apart on either side of the plane 43 as shown in FIG. 4.
  • the presentation mechanism is then advanced and the bars 32 advance horizontally until they come to occupy the position of FIG. 5 in which their parts intended for welding are arranged inside the opening without being obstructed by the bellows, as seen in FIG. 4.
  • the cylinder 40 then lowers the heating jaw 39 in the direction of the arrow and the bars are finally applied one against the other while the heating jaws are supplied with electric current and are heated rapidly to cause the welding of the two walls 1 on the external faces of the respective bars 32.
  • the station formed by the table 19 rocks around its axis 20 and the bag slides into a receiving device 46 designed to count the bags and stack them to deliver them to a suitable store.
  • the device then returns to its initial position and the rollers 18 are again actuated to form a new bag.

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Abstract

Method for fabricating a bag from a sheath (11) to which side bellows are formed, wherein a station (19) comprises two bar loaders (41, 42) and means presenting two parallel bars (32) spaced from each other inwardly of the bag opening of which the two edges have been previously separated from each other by suction means so as to open, at least partially, the bellows; welding jaws weld the bars inside the bag, the bag being cut out by means of a blade (25) and its bottom being welded by a jaw (27).

Description

Procédé de fabrication de sacs en matière souple notamment plastique, dispositif pour la mise en oeuvre de ce procédé et sacs obtenus. Method for manufacturing bags made of flexible material, in particular plastic, device for implementing this method and bags obtained.
La présente invention a trait à un procédé de fabrication de sacs en matière plastique souple ou éventuellement en papier et, plus précisément, de sacs dits à soufflets. L'invention a également trait à un dispositif pour la mise en oeuvre de ce procédé ainsi qu'aux sacs obtenus par ce procédé.The present invention relates to a process for manufacturing flexible plastic bags or possibly paper and, more specifically, so-called bellows bags. The invention also relates to a device for implementing this process as well as to the bags obtained by this process.
Les sacs en matière plastique souple a soufflets, qui sont destinés à l'emballage et au transport d'articles divers, par exemple d'articles vestimentaires après leur vente au détail, sont fabriqués, en général, à partir d'une gaine en matière plastique que l'on fait défiler sous une forme aplatie et que l'on découpe de façon à former des tronçons de gaine dont l'ouverture inférieure est obturée par soudage et dont l'ouverture supérieure reçoit intérieurement deux barrettes rigides ou semi-rigides munies chacune d'une poignée, la gaine étant pliée avant découpage et soudage, de façon à former sur les deux bords parallèles à la direction longitudinale de la gaine, chaque fois un soufflet destiné à diminuer la largeur apparente du sac tout en lui conférant une capacité de réception suffisante. Les barrettes, pour leur part, présentent une forme longitudinale allongée dont la longueur correspond sensiblement à la largeur du sac replié avec ses soufflets. Les barrettes et éventuellement les poignées qu'elles portent, comprennent des moyens de blocage mutuel par encliquetage permettant une fermeture et une ouverture aixsées du sac.The flexible plastic bags with bellows, which are intended for the packaging and transport of various articles, for example clothing articles after their retail sale, are generally made from a sheath made of plastic which is scrolled in a flattened form and which is cut so as to form sheath sections whose lower opening is closed by welding and whose upper opening receives two rigid or semi-rigid bars internally provided each of a handle, the sheath being folded before cutting and welding, so as to form on the two edges parallel to the longitudinal direction of the sheath, each time a bellows intended to reduce the apparent width of the bag while giving it a capacity sufficient reception. The bars, for their part, have an elongated longitudinal shape whose length corresponds substantially to the width of the folded bag with its bellows. The bars and possibly the handles that they carry, include means for mutual locking by snap-fastening allowing a closing and an opening of the bag.
La fabrication de barrettes s'effectue par moulage par injection de matière plastique dans un moule spécialement conçu de façon à pouvoir mouler, à la fois, les deux barrettes (avec leurs poignées) d'un même sac, les deux barrettes se présentant dans le moule côte à côte à faible distance avec les poignées s'étendant de part et d'autre. A la sortie du moule, un opérateur ou un mécanisme empoigne les deux barrettes encore reliées par les ponts d'injection fracturables pendant qu'elles sont encore chaudes, pour les replier l'une contre l'autre de façon à faire s'interpénétrer les moyens de blocage par encliquetage dont sont pourvues les barrettes et éventuellement les poignées. Ceci présente l'avantage d'éviter un retrait différentiel qui empêcherait les moyens de fermeture des deux barrettes de se trouver exactement les uns en face des autres, mais a, surtout, pour but de permettre à une personne d'insérer les deux barrettes encliquetées à l'intérieur du sac, dans son ouverture supérieure, pour présenter l'ensemble à une machine de soudage dont les deux mâchoires viennent souder les extrémités supérieures des deux faces du sac contre les barrettes, un soudage des barrettes à l'extérieur du sac étant pratiquement impossible puisqu'il faudrait amener les mâchoires de soudure dans l'ouverture du sac. Une telle opération ne présente pas de difficultés particulières lorsqu'il s'agit de sacs sans soufflets. Cependant avec les sacs à soufflets, l'introduction de l'ensemble constitué par les deux barrettes assemblées entre elles dans l'ouverture du sac est gênée par la présence du soufflet replié vers l'intérieur des deux côtés du sac. En conséquence, la personne chargée de cette opération écarte les deux extrémités des deux barrettes les unes des autres, tout en maintenant les parties centrales des barrettes assemblées entre elle, ce qui permet d'introduire l'ensemble formé par les deux barrettes dans l'ouverture du sac tout en faisant passer chaque soufflet entre les extrémités écartées des barrettes, ce qui nécessite, bien entendu, une grande dextérité. La personne présente ensuite l'ensemble du sac et des barrettes à la machine à souder en prenant soin de maintenir le sac et les barrettes en bonne position.The manufacture of bars is carried out by plastic injection molding in a specially designed mold so as to be able to mold, at the same time, the two bars (with their handles) from the same bag, the two bars being present in the mold side by side at a short distance with the handles extending on both sides. At the exit of the mold, an operator or a mechanism grabs the two bars still connected by the fracturable injection bridges while they are still hot, to fold them against each other so as to interpenetrate the snap-on locking means with which the bars and possibly the handles are provided. This has the advantage of avoiding a differential withdrawal which would prevent the means for closing the two bars from being exactly opposite one another, but has, above all, the aim of allowing a person to insert the two snap-on bars inside the bag, in its upper opening, to present the assembly to a welding machine, the two jaws of which weld the upper ends of the two faces of the bag against the bars, a welding of the bars outside the bag being practically impossible since it would be necessary to bring the jaws of welding into the opening of the bag. Such an operation does not present any particular difficulties in the case of bags without bellows. However with the bellows bags, the introduction of the assembly constituted by the two bars assembled together in the opening of the bag is hampered by the presence of the bellows folded inwards on the two sides of the bag. Consequently, the person in charge of this operation spreads the two ends of the two bars apart from each other, while maintaining the central parts of the bars assembled therebetween, which makes it possible to introduce the assembly formed by the two bars into the opening of the bag while passing each bellows between the spaced ends of the bars, which of course requires great dexterity. The person then presents the whole bag and bars to the welding machine, taking care to keep the bag and the bars in good position.
Ce travail répétitif, qui ne peut, cependant, être confié qu'à des personnes expérimentées, constitue un goulet d'étranglement dans la production aussi bien du point de vue de la cadence que du point de vue du prix de revient.This repetitive work, which can, however, be entrusted only to experienced people, constitutes a bottleneck in production both from the point of view of production rate and from the point of view of cost price.
Des problèmes analogues surgissent, bien entendu, dans le cas où l'on désire introduire dans un sac à soufflets en papier, de telles barrettes moulées, destinées à être fixées par collage à l'intérieur de l'ouverture du sac.Similar problems arise, of course, in the case where it is desired to introduce into a paper bellows bag, such molded bars, intended to be fixed by gluing inside the opening of the bag.
On a déjà essayé d'automatiser ces opérations en utilisant des mécanismes complexes qui réalisent une certaine ouverture du sac tout en maintenant les soufflets bien en place et qui écartent les extrémités des deux barrettes assemblées afin de les ajuster dans l'ouverture de forme compliquée ainsi présentée par le sac mais ces essais n'ont pas permis d'augmenter les cadences et ont finalement été abandonnés, l'utilisation de personnes spécialisées s'étant, en fin de compte, avérée plus fiable et aussi rapide.We have already tried to automate these operations using complex mechanisms which achieve a certain opening of the bag while keeping the bellows firmly in place and which separate the ends of the two assembled bars in order to adjust them in the opening of complicated shape as well. presented by the bag but these tests did not make it possible to increase the rates and were finally abandoned, the use of specialized people having, in the end, proven to be more reliable and also fast.
Ainsi le brevet britannique 1.367.952 décrit un procédé et un dispositif permettant de souder des barrettes plastiques munies de poignées à l'intérieur de l'ouverture de sacs comprenant des soufflets. Aucune précision n'est donnée sur la longueur des barrettes et ce document divulgue simplement l'idée de réaliser de façon automatique l'insertion de barrettes qui s'effectuait manuellement. Ce dispositif n'a jamais été réalisé et on a continué à mettre en place les barrettes manuellement dans les sacs. Le brevet français 2.027.997 décrit un procédé permettant le soudage des barrettes à l'intérieur de l'ouverture d'un sac à soufflets, les barrettes ayant une longueur qui est pratiquement égale à la largeur du sac. Pour réaliser cette opération, ce document prévoit de pratiquer des encoches ou des coupes dans les soufflets de façon à obtenir des prolongations des faces planes du sac et ne pas être gêné par la présence des soufflets. Un tel procédé nécessite une opération supplémentaire sur le sac et conduit à un affaiblissèment de sa solidité.British patent 1,367,952 describes a method and a device for welding plastic bars provided with handles inside the opening of bags comprising bellows. No details are given on the length of the bars and this document simply discloses the idea of automatically carrying out the insertion of bars which was carried out manually. This device was never implemented and we continued to place the bars manually in the bags. French patent 2,027,997 describes a process allowing the welding of the bars inside the opening of a bellows bag, the bars having a length which is practically equal to the width of the bag. To carry out this operation, this document provides for making notches or cuts in the bellows so as to obtain extensions of the flat faces of the bag and not to be hampered by the presence of the bellows. Such a process requires an additional operation on the bag and leads to a weakening of its solidity.
Le brevet britannique 1.138.209 décrit un dispositif pour la pose et le soudage de la barrette à l'extérieur du sac le long de lignes d'affaiblissement préalablement réalisées. Le brevet allemand 1.937.480 décrit un dispositif de mise en place de barrette dans lequel la longueur des barrettes est suffisamment faible pour ne pas être gênée par les soufflets.British patent 1,138,209 describes a device for laying and welding the bar outside the bag along lines of weakness previously made. German patent 1,937,480 describes a device for positioning a bar in which the length of the bars is sufficiently short so as not to be obstructed by the bellows.
D'une façon générale, à la connaissance de la déposante, il n'existe dans le monde aucune installation permettant la pose et le soudage automatique de barrettes dont la longueur est pratiquement égale à la largeur du sac dans des sacs à soufflets, ces barrettes étant posées intérieurement dans l'ouverture, malgré la présence des soufflets qui gènent considérablement cette opération. Cela s'explique par le fait que la manipulation de parois extrêmement souples et la mise en oeuvre d'opérations complexes de présentation, de mise en contact et de soudage ou solidarisation n'a pas pu être effectuée à grande cadence avec un degré de fiabilité suffisant pour pouvoir, compte tenu de l'investissement nécessaire, concurencer, du point de vue économique, les procédés manuels mis en oeuvre jusqu'à présent.In general, to the knowledge of the applicant, there is no installation in the world allowing the installation and the automatic welding of bars whose length is practically equal to the width of the bag in bellows bags, these bars being placed internally in the opening, despite the presence of the bellows which considerably hamper this operation. This is explained by the fact that the handling of extremely flexible walls and the implementation of complex presentation, contacting and welding or joining operations could not be carried out at high speed with a degree of reliability. sufficient to be able, taking into account the necessary investment, to compete, from an economic point of view, the manual processes implemented until now.
La présente invention se propose de remédier à ces inconvénients et de fournir un procédé de fabrication de sacs en matière souple telle que plastique ou papier du type à soufflets, munis de barrettes avec poignées, qui supprime l'intervention manuelle jusqu'à présent nécessaire et permette donc de diminuer le prix de revient. Un autre objectif de l'invention est de fournir un dispositif pour la mise en oeuvre de ce procédé qui soit simple et fiable.The present invention proposes to remedy these drawbacks and to provide a method of manufacturing bags of flexible material such as plastic or paper of the bellows type, provided with bars with handles, which eliminates the manual intervention hitherto necessary and therefore reduces the cost price. Another objective of the invention is to provide a device for the implementation of this method which is simple and reliable.
Un autre objectif encore de l'invention est de supprimer les opérations d'assemblage de barrettes à la sortie du moule, augmentant ainsi la cadence de moulage et supprimant un opérateur ou un mécanisme.Yet another objective of the invention is to eliminate the operations of assembling bars at the outlet of the mold, thereby increasing the rate of molding and eliminating an operator or a mechanism.
L'invention a pour objet un procédé de fabrication de sacs en matière souple notamment plastique ou papier présentant des soufflets latéraux, dans lequel on réalise une gaine aplatie en matière plastique, on replie les deux bords de la gaine vers l'intérieur de façon à former deux soufflets latéraux, on découpe la gaine en sacs individuels dont le fond est soudé, on réalise par moulage-injection, pour chaque sacs, deux barrettes portant chacune une poignée ainsi que des moyens de fermeture susceptibles de coopérer les uns avec les autres sur les barrettes dont la longueur est nettement supérieure à la distance séparant les deux soufflets, et l'on fixe par soudage ou collage les barrettes par leurs faces externes contre les bords internes de l'ouverture du sac, caractérisé en ce que l'on amène séparément les deux barrettes en face de l'ouverture et, l'écartant l'un de l'autre les deux bords de l'ouverture, on introduit simultanément les deux barrettes disposées parallèlement l'une à l'autre mais séparées par un espace autorisant le passage des deux soufflets entre les barrettes, après quoi on fixe les faces internes des deux bords du sac contre leurs barrettes respectives.The subject of the invention is a method of manufacturing bags made of flexible material, in particular plastic or paper, having lateral bellows, in which a flattened sheath of plastic is produced, the two edges of the sheath are folded inwards so as to form two lateral bellows, the sheath is cut into individual bags whose bottom is welded, there is produced by injection molding, for each bags, two bars each carrying a handle as well as closure means capable of cooperating with each other on the bars whose length is clearly greater than the distance separating the two bellows, and the bars are fixed by welding or gluing by their external faces against the internal edges of the opening of the bag, characterized in that one brings separately the two bars opposite the opening and, separating the two edges of the opening from one another, the two bars arranged simultaneously are introduced s parallel to each other but separated by a space allowing the passage of the two bellows between the bars, after which the internal faces of the two edges of the bag are fixed against their respective bars.
De préférence, le procédé est mis en oeuvre en continu avec la formation du sac à partir de la gaine et les barrettes sont avantageusement présentées en empilages, par exemple, à partir de réserves ou de chargeurs de barrettes disposés symétriquement par rapport au plan du sac.Preferably, the method is implemented continuously with the formation of the bag from the sheath and the bars are advantageously presented in stacks, for example, from reserves or bar chargers arranged symmetrically with respect to the plane of the bag. .
Pour écarter les deux bords de l'ouverture du sac et déplier, en conséquence, les soufflets, on agit, de préférence, par aspiration sur les faces externes des deux bords. On peut, simultanément, tendre les soufflets en exerçant sur leur sommet interne une poussée dans le plan de symétrie du sac.To separate the two edges of the opening of the bag and to unfold the bellows accordingly, action is preferably taken by suction on the external faces of the two edges. One can, simultaneously, tighten the bellows by exerting on their internal top a push in the plane of symmetry of the bag.
De façon avantageuse, la mise en place et le soudage des barrettes dans l'ouverture du sac peuvent s'effectuer en même temps que la découpe et le soudage du fond du sac.Advantageously, the positioning and welding of the bars in the opening of the bag can be carried out at the same time as the cutting and welding of the bottom of the bag.
Grâce au procédé selon l'invention, on aboutit à une fabrication à grande cadence des sacs, par exemple, de l'ordre de 20 sacs par minute, et ceci dans des conditions de très grande fiabilité, et en supprimant la nécessité de rassembler les deux barrettes d'un même sac après qu'elles ont été moulées, ce qui permet de simplifier le moule et d'accroître sa cadence de production tout en supprimant le poste de travail ou le mécanisme chargé de rassembler les deux barrettes au sortir du moule.Thanks to the method according to the invention, it results in a high-speed production of bags, for example, of the order of 20 bags per minute, and this under conditions of very high reliability, and eliminating the need to collect the two bars of the same bag after they have been molded, which simplifies the mold and increases its production rate while eliminating the work station or the mechanism responsible for bringing the two bars out of the mold .
L'invention a également pour objet un dispositif pour la mise en oeuvre de ce procédé, caractérisé en ce qu'il comporte des moyens permettant de présenter une gaine ou un sac déjà découpé à partir de la gaine dans une position aplatie, des moyens, de préférence à aspiration, permettant d'écarter, d'une certaine distance, les deux bords de l'ouverture du sac et de déplier, au moins partiellement les soufflets, des moyens pour présenter, de part et d'autre du plan de symétrie du sac, deux barrettes disposées parallèlement et écartées l'une de l'autre d'une distance suffisante pour ne plus être gênés par la présence des soufflets, et introduire lesdites barrettes dans l'ouverture ainsi formée au voisinage des faces internes des bords correspondants du sac, et des moyens pour souder ou coller lesdits bords contre les barrettes.The invention also relates to a device for the implementation of this method, characterized in that it comprises means making it possible to present a sheath or a bag already cut from the sheath in a flattened position, means, preferably by suction, making it possible to separate, by a certain distance, the two edges of the opening of the bag and to unfold, at least partially the bellows, means for presenting, on either side of the plane of symmetry of the bag, two bars arranged in parallel and spaced from each other by a sufficient distance so as no longer to be hampered by the presence of the bellows, and introduce said bars into the opening thus formed in the vicinity of the internal faces of the corresponding edges of the bag, and means for welding or gluing said edges against the bars.
De préférence, les moyens présentant et maintenant les barrettes dans l'ouverture du sac, sont conçus de façon à permettre, une fois que les barrettes sont disposées dans l'ouverture, le rapprochement des deux barrettes l'une vers l'autre, et éventuellement, l'encliquetage de leurs moyens d'assemblage mutuel, par exemple, sous l'effet de mâchoires de soudage, ce qui rend inutile l'insertion d'une pièce d'appui entre les deux barrettes pendant le soudage, et autorise ensuite la délivrance d'un sac fermé. Les moyens de présentation des barrettes sont de préférence alimentés par deux chargeurs de barrettes disposés symétriquement par rapport au plan de symétrie du sac et associés à des moyens tels que des doigts mobiles pour dégager les barrettes extrêmes, se faisant face, des deux chargeurs et les amener dans l'ouverture du sac.Preferably, the means presenting and maintaining the bars in the opening of the bag are designed so as to allow, once the bars are placed in the opening, the bringing together of the two bars towards each other, and possibly the snap of their mutual assembly means, for example, under the effect of welding jaws, which makes it unnecessary to insert a support piece between the two bars during welding, and then authorizes the delivery of a closed bag . The presentation means of the bars are preferably supplied by two bar loaders arranged symmetrically with respect to the plane of symmetry of the bag and associated with means such as movable fingers to release the end bars, facing each other, from the two chargers and the bring it into the opening of the bag.
En variante, on peut réaliser les barrettes de façon qu'elles puissent être encliquetées les unes contre les autres pour former deux empilages stables par eux-mêmes, ce qui dispense de l'utilisation de chargeurs. Le dispositif comporte, de préférence, un poste assurant à la fois le découpage et le soudage du fond du sac en même temps que la mise en place et le soudage des barrettes et, dans ce cas, on prévoit avantageusement un détecteur de position du sac tel que, par exemple, un capteur optique sensible à une inscription disposée de façon répétitive sur la gaine, laquelle peut avantageusement se présenter sur une bobine ou même être fabriquée en place, dans le cas où elle est réalisée par pliage et soudage d'un bord. L'évacuation des sacs peut avantageusement être réalisée en prévoyant d'amener le sac ou la gaine, lors de la mise en place et du soudage des barrettes, sur une table qui est susceptible de basculer après la mise en oeuvre des différentes opérations de sorte que le sac glisse par sa propre gravité dans un dispositif de réception permettant un comptage et un empilage automatiques.Alternatively, the bars can be made so that they can be snapped against each other to form two stacks that are stable by themselves, which eliminates the need for chargers. The device preferably comprises a station ensuring both the cutting and the welding of the bottom of the bag at the same time as the positioning and the welding of the strips and, in this case, a bag position detector is advantageously provided such as, for example, an optical sensor sensitive to an inscription repetitively disposed on the sheath, which can advantageously be presented on a coil or even be fabricated in place, in the case where it is produced by folding and welding a edge. The bags can be evacuated advantageously by planning to bring the bag or the sheath, during the positioning and welding of the bars, on a table which is capable of tilting after the implementation of the various operations so the bag slides by its own gravity into a receiving device allowing automatic counting and stacking.
On peut utiliser, pour la mise en oeuvre de l'invention, des barrettes avec poignées tout à fait classiques munies d'ergots et de trous d'encliquetage mutuel mais on peut également prévoir de donner au trou d'encliquetage une dimension, dans le sens de la longueur de la barrette, supérieure à la dimension correspondante de l'ergot ou élément mâle d'encliquetage de façon à permettre, même en cas de retrait différentiel des barrettes se refroidissant après le moulage, un assemblage par encliquetage des barrettes et l'invention a également pour objet les sacs possédant de telles barrettes.It is possible to use, for the implementation of the invention, bars with completely conventional handles provided with lugs and mutual snap-on holes, but it is also possible to provide for giving the snap-on hole a dimension, in the direction of the length of the strip, greater than the corresponding dimension of the lug or male latching element so as to allow, even in the event of differential withdrawal of the cooling strips after molding, assembly by latching of the bars and the invention also relates to bags having such bars.
D'autres avantages et caractéristiques de l'invention apparaîtront à la lecture de la description suivante, faite à titre d'exemple non limitatif et se référant au dessin annexé dans lequel : la figure 1 représente une vue d'un sac fabriqué selon l'invention, la figure 2 représente une vue d'un sac avec une variante de barrettes selon l'invention, la figure 3 représente une vue schématique en élévation d'un dispositif selon l'invention, la figure 4 représente schématiquement l'ouverture du sac vue de face au moment de l'insertion des barrettes, la figure 5 représente une vue analogue à la figure 4, en coupe verticale.Other advantages and characteristics of the invention will appear on reading the following description, given by way of nonlimiting example and referring to the appended drawing in which: FIG. 1 represents a view of a bag manufactured according to the invention, FIG. 2 represents a view of a bag with a variant of bars according to the invention, FIG. 3 represents a schematic elevation view of a device according to the invention, FIG. 4 diagrammatically represents the opening of the bag front view at the time of insertion of the bars, Figure 5 shows a view similar to Figure 4, in vertical section.
Le sac représenté sur la figure 1 présente deux faces principales 1 et deux soufflets latéraux 2 avec un fond 3 fermé par soudure. L'ouverture du sac présente, à l'intérieur, deux barrettes de rigidification 4 en matière plastique moulée munies de leurs poignées 5 ainsi que des moyens d'assemblage par encliquetage tels que des ergots 6 et des trous 7. On peut ainsi rapprocher les deux barrettes avec leurs poignées, l'une de l'autre et, faisant pénétrer les ergots dans les trous, assembler les barrettes et poignées l'une à l'autre et fermer le sac.The bag shown in Figure 1 has two main faces 1 and two side bellows 2 with a bottom 3 closed by welding. The opening of the bag has, inside, two stiffening bars 4 of molded plastic material provided with their handles 5 as well as snap-on assembly means such as lugs 6 and holes 7. It is thus possible to bring the two bars with their handles, one from the other and, making the pins penetrate the holes, assemble the bars and handles to each other and close the bag.
Conformément à l'invention, en se référant à la figure 2, on voit que l'on peut remplacer les ergots et trous circulaires de la figure 1 par des ergots de sec tion carrée ou rectangulaire 8 pénétrant dans des trous rectangulaires ou oblongs 9 de plus grande longueur, ce qui permet une fermeture même si les entraxes entre ergots et trous d'une même barrette sont légèrement différents des entraxes correspondants de l'autre barrette.In accordance with the invention, with reference to FIG. 2, it can be seen that the lugs and circular holes in FIG. 1 can be replaced by dry lugs square or rectangular tion 8 penetrating into rectangular or oblong holes 9 of greater length, which allows closing even if the distances between pins and holes of the same bar are slightly different from the corresponding centers of the other bar.
On se réfère maintenant aux figures 3 à 5. Le dispositif permettant la mise en oeuvre du procédé selon l'invention comporte une bobine 10 supportant un enroulement d'une gaine en matière plastique souple 11 qui se dévide sous tension en étant renvoyée sur un rouleau de tension 12 vers un poste de formage des soufflets 13 d'un type tout à fait classique dans lequel on forme les deux soufflets 2, sur les deux côtés de la gaine 11. La gaine peut venir d'extrusion ou être obtenue par pliage et soudage d'un film. Ce poste de formation de soufflets 13 ne sera pas décrit plus en détail, étant d'un type tout à fait usuel. De là, la gaine avec ses soufflets passe à travers le dispositif de chauffage par air chaud 14, d'un type également classique, à la suite de quoi, la gaine, avec ses soufflets, passe sur un ensemble de trois cylindres 15, dont un cylindre est rappelé avec un effort sur les deux autres de façon à assurer une fixation des plis, préalablement chauffés, des soufflets. La gaine avec ses soufflets passe ensuite dans une zone de stockage 16 d'un type usuel dont la longueur variable permet d'accorder les rythmes continus et pas-à-pas des parties du dispositif en amont et en aval de la zone 16.Referring now to Figures 3 to 5. The device for implementing the method according to the invention comprises a coil 10 supporting a winding of a flexible plastic sheath 11 which is unwound under tension by being returned on a roller tension 12 to a bellows forming station 13 of a completely conventional type in which the two bellows 2 are formed, on the two sides of the sheath 11. The sheath can come from extrusion or be obtained by folding and welding of a film. This bellows training station 13 will not be described in more detail, being of a very usual type. From there, the sheath with its bellows passes through the hot air heating device 14, of an equally conventional type, after which, the sheath, with its bellows, passes over a set of three cylinders 15, of which a cylinder is recalled with an effort on the other two so as to ensure fixing of the folds, previously heated, of the bellows. The sheath with its bellows then passes into a storage area 16 of a usual type whose variable length makes it possible to tune the continuous and step-by-step rhythms of the parts of the device upstream and downstream of the area 16.
Vers la sortie de la zone de stockage 16, se trouve un dispositif de détection optique 17 sensible au passage d'un dessin ou d'une impression apparaissant de façon périodique sur la gaine et dont le pas est égal à la longueur des sacs à former, afin de commander le découpage des sacs. Des rouleaux 18 renvoient ensuite la gaine sur une table 19 susceptible de pivoter entre la position représentée en trait plein et la position représentée en trait interrompu autour d'un axe 20 grâce à la traction d'un vérin 21. La table 19 comporte notamment deux traverses rigides 22, 23. La traverse 22, dont la position est fixe, supporte un enrouleur de feuillard métallique 24 recevant un feuillard métallique qui passe sur la traverse 22 et sous la gaine de matière plastique qui défile entre le feuillard et un couteau de découpage 25 avec son mécanisme d'actionnement 26. Très légèrement en aval du couteau 25, se trouve une mâchoire de soudage 27 actionnée par un vérin 28. On comprend qu'on peut ainsi procéder à la fois au découpage d'un sac à partir de la gaine et au soudage du fond du sac, le feuillard métallique qui passe sous la gaine permettant d'éviter une usure de zone de la traverse 22 recevant le couteau et la chaleur de la mâchoire chauffante 27. Un détecteur de position de sac 29 sensible à un dessin ou une inscription portée sur le sac garantit un bon positionnement respectif de la gaine et des différents mécanismes agissant au niveau de la table de fabrication 19.Towards the exit from the storage area 16, there is an optical detection device 17 sensitive to the passage of a design or an impression appearing periodically on the sheath and whose pitch is equal to the length of the bags to be formed. , in order to control the cutting of the bags. Rollers 18 then return the sheath to a table 19 capable of pivoting between the position shown in solid lines and the position shown in broken lines around an axis 20 by virtue of the traction of a jack 21. The table 19 comprises in particular two rigid crosspieces 22, 23. The crosspiece 22, the position of which is fixed, supports a metal strip winder 24 receiving a metal strip which passes over the crosspiece 22 and under the plastic sheath which passes between the strip and a cutting knife 25 with its actuation mechanism 26. Very slightly downstream of the knife 25, there is a welding jaw 27 actuated by a jack 28. It is understood that it is thus possible to proceed at the same time to cut a bag from the sheath and when welding the bottom of the bag, the metal strip which passes under the sheath making it possible to avoid zone wear of the crosspiece 22 receiving the knife and the heat of the heating jaw 27. U n bag position detector 29 sensitive to a drawing or an inscription carried on the bag guarantees proper positioning of the sheath and of the various mechanisms acting on the manufacturing table 19.
La traverse 23, dont la position peut être réglée par un vérin 30, est solidaire du poste 31 de mise en place et de soudage des barrettes 32 analogues aux barrettes 4 mais pourvues d'une nervure 33 et d'une poignée d'épaisseur renforcée 34. Ce poste comporte un plateau 35 solidaire de la traverse 23 et se terminant par un élément transversal poreux d'aspiration 36 suivi d'une mâchoire chauffante fixe 37. Il comporte également un ensemble supérieur mobile présentant, à l'extrémité d'un support convenable, un élément allongé d'aspiration 38 et une mâchoire chauffante 39, l'ensemble étant actionné par un vérin 40. La distance entre la mâchoire de soudage 27 et le jeu de mâchoires 37, 39, correspond à la longueur du sac et peut être adaptée aux sacs de différentes longueurs en agissant sur le vérin 30. Les barrettes 32 sont librement empilées dans deux chargeurs 41, 42 disposés symétriquement de part et d'autre d'un plan horizontal 43 passant un peu au-dessus du plateau 35. Ces chargeurs présentent, à leurs deux extrémités se faisant face, des moyens de distribution de barrettes individuelles comprenant, par exemple, des organes rotatifs à picots et des doigts repoussés par des vérins 44, 45. La commande de ces mécanismes est assurée de façon que les chargeurs présentent simultanément une barrette supérieure et une barrette inférieure disposées chacune horizontalement, les deux barrettes étant parallèles et situées dans l'écartement représenté sur la figure 4. A cet effet, un mécanisme de préhension de barrettes est avantageusement prévu entre les deux chargeurs 41 et 42. Ce mécanisme, non seulement, est capable de présenter les barrettes horizontalement et parallèlement dans la position représentée sur la figure 4, mais également de déplacer l'ensemble de ces corx barrettes horizontalement en direction des mâchoires 37, 39, avec leurs éléments d'aspiration associés 36, 38.The cross member 23, the position of which can be adjusted by a jack 30, is integral with the station 31 for positioning and welding bars 32 similar to bars 4 but provided with a rib 33 and a handle of reinforced thickness 34. This station comprises a plate 35 integral with the cross-member 23 and ending with a porous transverse suction element 36 followed by a fixed heating jaw 37. It also comprises a movable upper assembly having, at the end of a suitable support, an elongated suction element 38 and a heating jaw 39, the assembly being actuated by a jack 40. The distance between the welding jaw 27 and the set of jaws 37, 39 corresponds to the length of the bag and can be adapted to bags of different lengths by acting on the jack 30. The bars 32 are freely stacked in two chargers 41, 42 arranged symmetrically on either side of a horizontal plane 43 passing a little above the plate 35. These chargers have, at their two opposite ends, means dispensing individual bars comprising, for example, rotary members with pins and fingers pushed back by jacks 44, 45. The control of these mechanisms is ensured so that the loaders simultaneously present an upper bar and a lower bar each arranged horizontally , the two bars being parallel and located in the spacing shown in FIG. 4. For this purpose, a bar gripping mechanism is advantageously provided between the two magazines 41 and 42. This mechanism not only is capable of presenting the bars horizontally and parallel in the position shown in Figure 4, but also to move the assembly ble of these corx bars horizontally in the direction of the jaws 37, 39, with their associated suction elements 36, 38.
En variante, si dans chaque empilage, les barrettes peuvent être temporairement solidarisées les unes aux autres par encliquetage, on peut se passer des chargeurs et prévoir, par exemple, de simples moyens de guidage des empilages de barrettes.As a variant, if in each stack, the bars can be temporarily secured to one another by snap-fastening, one can do without the chargers and provide, for example, simple means for guiding the stacks of bars.
Le mécanisme de préhension de barrettes, qui saisit les deux barrettes en provenance des chargeurs peut, par exemple, comporter deux équipages mobiles simultanément dans le olan horizontal vers le et à l'écart du sac et mobiles en sens inverses dans la direction verticale pour s'approcher ou s'écarter l'un de l'autre. Chaque équipage peut comporter, par exemple, une première barre s'engageant dans la partie femelle de la nervure 33 en épousant sa forme intérieure sans dépasser la barrette et une deuxiè me barre épousant la partie mâle de la nervure 33, les deux barres étant serrées l'une vers l'autre à la façon de mâchoires qui, lorsqu'elles sont serrées, maintiennent la barrette dans la position horizontale représentée sur la figure 5.The bar gripping mechanism, which grasps the two bars coming from the loaders, can, for example, have two crews movable simultaneously in the horizontal plane towards and away from the bag and movable in opposite directions in the vertical direction for s '' approach or move away from each other. Each crew can comprise, for example, a first bar engaging in the female part of the rib 33 by marrying its internal shape without exceeding the bar and a second bar fitting to the male part of the rib 33, the two bars being clamped towards each other in the manner of jaws which, when clamped, hold the bar in the horizontal position shown in FIG. 5.
Le fonctionnement est le suivant: La gaine 11 avec ses soufflets est délivrée à la table 19 par les rouleaux 18 et glisse horizontalement jusqu'à ce que son extrémité soit disposée en face des mâchoires 37, 39, dans la position axiale représentée sur la figure 5. L'obtention de cette position, c'est-à-dire l'arrêt du mouvement des rouleaux 18, est commandée par le détecteur de position 29. A ce moment, les rouleaux 18 étant arrêtés, la gaine est immobile pendant que la zone de stockage 16 prend en charge la partie de gaine qui se trouve en amont et qui, provenant de la bobine 10 et traversant les postes 13, 14 et 15, défile en continu. A ce moment les dispositifs 26 et 28 se trouvent actionnés et provoquent la découpe d'un tronçon de gaine devant former le sac ainsi que la soudure du fond 3 du sac par la mâchoire chauffante 27. Simultanément, le vérin 40 provoque la descente de l'ensemble des éléments 38, 39 de sorte que l'extrémité du sac destinée à former l'ouverture du sac se trouve prise entre les éléments 36, 37, d'une part, et les éléments 38, 39, d'autre part. A ce moment, les éléments 36 et 38 sont reliés à une source de dépression et les bords du sac sont appliqués par aspiration contre ces éléments et, par conséquent, contre les mâchoires 37 et 39. Le vérin 40 provoque alors un mouvement en sens inverse jusqu'à obtenir la position représentée sur les figures 4 et 5 dans laquelle les deux bords de la gaine 11 formant le sac se trouvent écartés l'un de l'autre, les soufflets prenant la position semi-ouverte représentée sur la figure 4. Pendant ce temps, les mécanismes de délivrance des chargeurs 41 et 42 ont pris deux barrettes et les ont amenées dans une position écartée de part et d'autre du plan 43 comme représenté sur la figure 4. Le mécanisme de présentation est alors avancé et les barrettes 32 avancent horizontalement jusqu'à venir occuper la position de la figure 5 dans laquelle leurs parties destinées au soudage viennent se disposer à l'intérieur de l'ouverture sans être gênées par les soufflets, comme on le voit sur la figure 4. Le vérin 40 abaisse ensuite la mâchoire chauffante 39 dans le sens de la flèche et les barrettes se trouvent finalement appliquées l'une contre l'autre pendant que les mâchoires chauffantes sont alimentées en courant électrique et sont chauffées rapidement pour provoquer la soudure des deux parois 1 sur les faces externes des barrettes 32 respectives. Après cela, le poste formé par la table 19 bascule autour de son axe 20 et le sac glisse dans un dispositif de réception 46 conçu de façon à compter les sacs et les empiler pour les délivrer à un magasin convenable. Le dispositif revient ensuite à sa position initiale et les rouleaux 18 sont à nouveau actionnés pour la formation d'un nouveau sac.The operation is as follows: The sheath 11 with its bellows is delivered to the table 19 by the rollers 18 and slides horizontally until its end is disposed opposite the jaws 37, 39, in the axial position shown in the figure 5. The obtaining of this position, that is to say the stopping of the movement of the rollers 18, is controlled by the position detector 29. At this time, the rollers 18 being stopped, the sheath is stationary while the storage area 16 supports the sheath part which is located upstream and which, coming from the reel 10 and passing through the stations 13, 14 and 15, runs continuously. At this time, the devices 26 and 28 are actuated and cause the cutting of a section of sheath which must form the bag as well as the welding of the bottom 3 of the bag by the heating jaw 27. Simultaneously, the jack 40 causes the descent of the 'set of elements 38, 39 so that the end of the bag intended to form the opening of the bag is caught between the elements 36, 37, on the one hand, and the elements 38, 39, on the other hand. At this time, the elements 36 and 38 are connected to a source of vacuum and the edges of the bag are applied by suction against these elements and, consequently, against the jaws 37 and 39. The jack 40 then causes movement in the opposite direction until the position shown in FIGS. 4 and 5 is obtained in which the two edges of the sheath 11 forming the bag are spaced from one another, the bellows taking the semi-open position shown in FIG. 4. During this time, the delivery mechanisms of the magazines 41 and 42 took two bars and brought them into a position spaced apart on either side of the plane 43 as shown in FIG. 4. The presentation mechanism is then advanced and the bars 32 advance horizontally until they come to occupy the position of FIG. 5 in which their parts intended for welding are arranged inside the opening without being obstructed by the bellows, as seen in FIG. 4. The cylinder 40 then lowers the heating jaw 39 in the direction of the arrow and the bars are finally applied one against the other while the heating jaws are supplied with electric current and are heated rapidly to cause the welding of the two walls 1 on the external faces of the respective bars 32. After that, the station formed by the table 19 rocks around its axis 20 and the bag slides into a receiving device 46 designed to count the bags and stack them to deliver them to a suitable store. The device then returns to its initial position and the rollers 18 are again actuated to form a new bag.
On comprend que le rapprochement des deux barrettes l'une de l'autre pendant le soudage provoque également l'encliquetage des ergots tels que 6 ou 8 portés par les barrettes de sorte que le sac à l'état terminé se trouve dans une position de fermeture.It is understood that the bringing together of the two bars from one another during the welding also causes the latching of lugs such as 6 or 8 carried by the bars so that the bag in the finished state is in a position of closing.
Bien que l'invention ait été décrite à propos d'une forme de réalisation particulière, il est bien entendu qu'elle n'y est nullement limitée et qu'on peut lui apporter diverses modifications de forme ou de matériau sans pour cela s'éloigner ni de son cadre ni de son esprit. Although the invention has been described in connection with a particular embodiment, it is understood that it is in no way limited thereto and that it can be made various modifications of shape or material without thereby move away from his frame and his mind.

Claims

REVENDICATIONS 1°- Procédé de fabrication de sacs en matière souple notamment plastique ou papier présentant des soufflets latéraux (2), dans lequel on réalise une gaine aplatie en matière plastigue (11), on replie les deux bords de la gaine vers l'intérieur de façon à former deux soufflets latéraux (2), on découpe la gaine en sacs individuels dont le fond (3) est soudé, on réalise par moulage-injection, pour chaque sac, deux barrettes (4, 32) portant chacune une poignée ainsi que des moyens de fermeture susceptibles de coopérer les uns avec les autres sur les barrettes dont la longueur est nettement supérieure à la distance séparant les deux soufflets, et l'on fixe par soudage ou collage les barrettes (4, 32) par leurs faces externes contre les bords internes de l'ouverture du sac, caractérisé en ce que l'on amène séparément les deux barrettes (4, 32) en face de l'ouverture du sac et, ayant ouvert ladite ouverture en écartant l'un de l'autre les deux bords de l'ouverture, on introduit simultanément les deux barrettes (4, 32) disposées parallèlement l'une à l'autre mais séparées par un espace autorisant le passage des deux soufflets (2) entre les barrettes, après quoi on fixe les faces internes des deux bords du sac contre leurs barrettes respectives. CLAIMS 1 ° - Method for manufacturing bags made of flexible material, in particular plastic or paper, having lateral bellows (2), in which a flattened sheath is made of plastic material (11), the two edges of the sheath are folded inwards so as to form two lateral bellows (2), the sheath is cut into individual bags whose bottom (3) is welded, two strips (4, 32) are produced by injection molding, each carrying a handle as well as closing means capable of cooperating with each other on the bars whose length is clearly greater than the distance separating the two bellows, and the bars (4, 32) are fixed by welding or by their external faces against the internal edges of the opening of the bag, characterized in that the two bars (4, 32) are brought separately in front of the opening of the bag and, having opened said opening by moving one of the other the two edges of the opening, the two bars (4, 32) are placed simultaneously arranged parallel to each other but separated by a space allowing the passage of the two bellows (2) between the bars, after which the internal faces of the two edges of the bag against their respective bars.
2°- Procédé selon la revendication 1, caractérisé en ce que les barrettes sont présentées à partir de deux empilages de barrettes disposés symétriquement par rapport au plan du sac.2 ° - Method according to claim 1, characterized in that the bars are presented from two stacks of bars arranged symmetrically with respect to the plane of the bag.
3°- Procédé selon la revendication 2, caractérisé en ce que les barrettes sont encliquetées les unes dans les autres dans l'empilage.3 ° - Method according to claim 2, characterized in that the bars are snapped into each other in the stack.
4°- Procédé selon la revendication 2, caractérisé en ce que les barrettes sont présentées à partir de réserves ou chargeurs.4 ° - Method according to claim 2, characterized in that the bars are presented from reserves or chargers.
5º- Procédé selon l'une quelconque des revendication 2 à 4, caractérisé en ce que l'on amène les deux barrettes dans leurs positions écartées l'une de l'autre en face de l'ouverture du sac et qu'à partir de cette position, on déplace les deux barrettes vers l'intérieur de l'ouverture du sac.5º- Method according to any one of claims 2 to 4, characterized in that one brings the two bars in their positions spaced from one another in front of the opening of the bag and that from this position, the two bars are moved towards the inside of the opening of the bag.
6°- Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, pour écarter les deux bords de l'ouverture du sac et déplier les soufflets, on agit par aspiration sur les faces externes des deux bords.6 ° - A method according to any one of claims 1 to 5, characterized in that, to spread the two edges of the opening of the bag and unfold the bellows, it acts by suction on the outer faces of the two edges.
7°- Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'on effectue la mise en place et le soudage ou collage des barrettes (4, 32) dans l'ouverture du sac en même temps que la découpe et le soudage du fond (3) du sac.7 ° - Method according to any one of claims 1 to 6, characterized in that one carries out the establishment and the welding or bonding of the bars (4, 32) in the opening of the bag at the same time as the cutting and welding the bottom (3) of the bag.
8°- Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'il comporte des moyens (19, 35) permettant de présenter une gaine ou un sac déjà découpé à partir de la gaine dans une position aplatie, des moyens (36,8 ° - Device for implementing the method according to any one of claims 1 to 7, characterized in that it comprises means (19, 35) for presenting a sheath or a bag already cut from the sheath in a flattened position, means (36,
38) permettant d'écarter, d'une certaine distance, les deux bords de l'ouverture du sac et de déplier, au moins partiellement, les soufflets (2), des moyens pour présenter, de part et d'autre du plan de symétrie du sac, deux barrettes disposées parallèlement et écartées l'une de l'autre d'une distance suffisante pour ne plus être gênées par la présence des soufflets, et introduire lesdites barrettes dans l'ouverture ainsi formée au voisinage des faces internés des bords correspondants du sac, et des moyens (37,38) making it possible to separate, by a certain distance, the two edges of the opening of the bag and to unfold, at least partially, the bellows (2), means for presenting, on either side of the plane of symmetry of the bag, two bars arranged in parallel and spaced from each other by a sufficient distance so as no longer to be hampered by the presence of the bellows, and introduce said bars into the opening thus formed in the vicinity of the internal faces of the edges bag correspondents, and means (37,
39) pour souder lesdits bords contre les barrettes.39) to weld said edges against the bars.
9°- Dispositif selon la revendication 8, caractérisé en ce qu'il comporte des moyens (41, 42) pour présenter deux empilages de barrettes (4, 32) auxdits moyens présentant les barrettes disposées parallèlement et écartées l'une de l'autre à l'ouverture du sac.9 ° - Device according to claim 8, characterized in that it comprises means (41, 42) for presenting two stacks of bars (4, 32) to said means having the bars arranged in parallel and spaced from one another when the bag is opened.
10°- Dispositif selon la revendication 9, caractérisé en ce que lesdits moyens comprennent deux chargeurs (41, 42). 11º- Dispositif selon l'une quelconque des revendications 8 à 10, caractérisé en ce que les moyens présen tant et maintenant les barrettes à l'ouverture du sac permettent, une fois que les barrettes sont disposées dans l'ouverture, le rapprochement des deux barrettes l'une vers l'autre et l'encliquetage de leurs moyens d'assemblages usuels pour réaliser le soudage des deux bords du sac sur les deux barrettes assemblées entre elles.10 ° - Device according to claim 9, characterized in that said means comprise two chargers (41, 42). 11º- Device according to any one of claims 8 to 10, characterized in that the means present as long as now the bars at the opening of the bag allow, once the bars are arranged in the opening, the bringing together of the two bars towards each other and the snap-fastening of their usual means of assembling to achieve the welding of the two edges of the bag on the two strips assembled together.
12°- Dispositif selon l'une quelconque des revendications 8 à 11, caractérisé en ce qu'il comporte un poste (19) assurant le découpage et le soudage ou collage du fond du sac en même temps que la mise en place et le soudage ou collage des barrettes.12 ° - Device according to any one of claims 8 to 11, characterized in that it comprises a station (19) ensuring the cutting and welding or gluing of the bottom of the bag at the same time as the establishment and the welding or bonding the bars.
13°- Dispositif selon la revendication 12, caractérisé en ce que ledit poste (19) présente une forme de table, des moyens (30) étant prévus pour adapter la longueur de la table aux dimensions du sac.13 ° - Device according to claim 12, characterized in that said station (19) has a table shape, means (30) being provided to adapt the length of the table to the dimensions of the bag.
14°- Dispositif selon l'une quelconque des revendications 12 et 13, caractérisé en ce que ledit poste (19) est monté pivotant autour d'un axe (20) de façon à pouvoir pivoter vers le bas à la fin de la fixation des barrettes et provoquer l'évacuation du sac terminé.14 ° - Device according to any one of claims 12 and 13, characterized in that said station (19) is pivotally mounted about an axis (20) so as to be able to pivot downwards at the end of the fixing of the strips and cause the evacuation of the finished bag.
15º- Sacs en matière plastique souple à soufflets obtenus par le procédé selon l'une quelconque des revendications 1 à 7.15º- Soft plastic bags with bellows obtained by the process according to any one of Claims 1 to 7.
16º- Sacs selon la revendication 15, caractérisés en ce qu'ils comportent, pour l'assemblage des deux barrettes (4), des trous (9) allongés dans la direction des barrettes et des ergots d'encliquetage (8) de dimensions inférieures de façon à autoriser l'assemblage des deux barrettes même lorsque les entraxes entre moyens d'assemblage des deux barrettes respectives sont légèrement différe.nts. 16º- Bags according to claim 15, characterized in that they comprise, for the assembly of the two bars (4), holes (9) elongated in the direction of the bars and latching lugs (8) of smaller dimensions so as to allow the assembly of the two bars even when the distances between the means of assembly of the two respective bars are slightly différe.nts.
PCT/FR1986/000082 1985-03-20 1986-03-13 Method for fabricating bags made of flexible material, particularly plastic, device for implementing such method and bags obtained thereby WO1986005442A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8504127A FR2590520B1 (en) 1985-03-20 1985-03-20 PROCESS FOR THE MANUFACTURE OF SOFT BAGS, IN PARTICULAR PLASTIC MATERIALS, DEVICE FOR CARRYING OUT SAID BAGS
FR85/04127 1985-03-20

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WO1986005442A1 true WO1986005442A1 (en) 1986-09-25

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PCT/FR1986/000082 WO1986005442A1 (en) 1985-03-20 1986-03-13 Method for fabricating bags made of flexible material, particularly plastic, device for implementing such method and bags obtained thereby

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EP (1) EP0215083A1 (en)
JP (1) JPS62502252A (en)
FR (1) FR2590520B1 (en)
WO (1) WO1986005442A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640193A1 (en) * 1988-12-14 1990-06-15 Decomatic Sa PROCESS FOR MANUFACTURING BAGS OF FLEXIBLE MATERIAL, IN PARTICULAR PLASTIC, DEVICE FOR CARRYING OUT SAID BAGS
WO2022238301A1 (en) * 2021-05-12 2022-11-17 Holweg Group Flexible bag having a convertible bottom, method and machine for manufacturing same
FR3122848A1 (en) * 2021-05-12 2022-11-18 Holweg Group Flexible bag with a convertible bottom, its method and its manufacturing machine.

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Publication number Priority date Publication date Assignee Title
FR1459894A (en) * 1965-08-23 1966-06-17 Windmoeller & Hoelscher Process for manufacturing shopping bags and device for implementing this process
GB1138209A (en) * 1965-03-03 1968-12-27 Windmoeller & Hoelscher Bag manufacture
FR2027997A1 (en) * 1969-01-09 1970-10-02 Lehmacher Michael Making plastic bags with reinforcing strips - for the mouth and handles
DE1937480A1 (en) * 1969-07-23 1971-02-18 Windmoeller & Hoelscher Bag machine for the production of plastic gusseted bags with handles
FR2147099A1 (en) * 1971-07-23 1973-03-09 Printex Sa Plastic shopping bags - with handles fabricated integrally with the bags
GB1367952A (en) * 1970-10-20 1974-09-25 Printex Method for manufacturing shopping bags and device for the working thereof
GB1597666A (en) * 1978-02-17 1981-09-09 Langton S M Handle for a bag

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1138209A (en) * 1965-03-03 1968-12-27 Windmoeller & Hoelscher Bag manufacture
FR1459894A (en) * 1965-08-23 1966-06-17 Windmoeller & Hoelscher Process for manufacturing shopping bags and device for implementing this process
FR2027997A1 (en) * 1969-01-09 1970-10-02 Lehmacher Michael Making plastic bags with reinforcing strips - for the mouth and handles
DE1937480A1 (en) * 1969-07-23 1971-02-18 Windmoeller & Hoelscher Bag machine for the production of plastic gusseted bags with handles
GB1367952A (en) * 1970-10-20 1974-09-25 Printex Method for manufacturing shopping bags and device for the working thereof
FR2147099A1 (en) * 1971-07-23 1973-03-09 Printex Sa Plastic shopping bags - with handles fabricated integrally with the bags
GB1597666A (en) * 1978-02-17 1981-09-09 Langton S M Handle for a bag

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640193A1 (en) * 1988-12-14 1990-06-15 Decomatic Sa PROCESS FOR MANUFACTURING BAGS OF FLEXIBLE MATERIAL, IN PARTICULAR PLASTIC, DEVICE FOR CARRYING OUT SAID BAGS
EP0375479A1 (en) * 1988-12-14 1990-06-27 Decomatic S.A. Method of manufacturing bags of supple material, particularly plastic ones, and device for realizing this
WO2022238301A1 (en) * 2021-05-12 2022-11-17 Holweg Group Flexible bag having a convertible bottom, method and machine for manufacturing same
FR3122848A1 (en) * 2021-05-12 2022-11-18 Holweg Group Flexible bag with a convertible bottom, its method and its manufacturing machine.

Also Published As

Publication number Publication date
FR2590520A1 (en) 1987-05-29
JPS62502252A (en) 1987-09-03
EP0215083A1 (en) 1987-03-25
FR2590520B1 (en) 1987-11-20

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