EP0002538B1 - Process for making an interconnected series of bags and apparatus for carrying out this process - Google Patents

Process for making an interconnected series of bags and apparatus for carrying out this process Download PDF

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Publication number
EP0002538B1
EP0002538B1 EP78101728A EP78101728A EP0002538B1 EP 0002538 B1 EP0002538 B1 EP 0002538B1 EP 78101728 A EP78101728 A EP 78101728A EP 78101728 A EP78101728 A EP 78101728A EP 0002538 B1 EP0002538 B1 EP 0002538B1
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EP
European Patent Office
Prior art keywords
bags
knife
heated element
fixed
bag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78101728A
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German (de)
French (fr)
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EP0002538A3 (en
EP0002538A2 (en
Inventor
Edouard Louis Van De Gent
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"printex" Une Droit Belge SA
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"printex" Une Droit Belge SA
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Priority claimed from BE183584A external-priority patent/BE862009A/en
Application filed by "printex" Une Droit Belge SA filed Critical "printex" Une Droit Belge SA
Publication of EP0002538A2 publication Critical patent/EP0002538A2/en
Publication of EP0002538A3 publication Critical patent/EP0002538A3/en
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Publication of EP0002538B1 publication Critical patent/EP0002538B1/en
Expired legal-status Critical Current

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    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • 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
    • B31B2155/003—Flexible containers made from webs starting from tubular 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

Definitions

  • the present invention relates to a process for the production of bundles of bags, made of heat-sealable material, these bags being of the "bottom weld" type and having a weakening zone parallel to the bottom of the bag and located near the edge of the bag opposite the bottom of the latter to allow the uprooting of the bags, one by one, from the bundle.
  • the methods according to the first category have either the disadvantage of requiring the interruption of the production of the bags for the relatively long time necessary for the assembly of the bags from a stack, which slows down the production of the machines for the implementation of these methods, that is the drawback of requiring handling of the bundles of unassembled bags to assemble them away from the machine producing the bags, which entails serious risks of disorganization of the batteries during their transport and which requires labor.
  • This method in addition to having the aforementioned drawback of complicating automatic machines due to the presence, for its implementation, of heated members distinct from the heated elements used for the manufacture of bags, also has the drawback of provide bundles of particularly fragile bags because the bags are joined to each other bag by bag and that one or more defective assemblies are sufficient in a stack for the latter to disintegrate into several sections.
  • the object of the invention is to remedy the aforementioned drawbacks and to provide a method, belonging to the second category mentioned above, the implementation of which can be increased, for bringing together the bags in bundles, directly by the elements which perform the bottom welding. bags, which makes it possible to significantly reduce the complexity of automatic machines for forming bundles of bags, and which makes it possible to obtain bundles of bags which are particularly resistant since the method provides for the binding of a bag to all previous bags.
  • said method consists in producing, in a manner known per se, the bags one by one, superimposing them to form a stack, comprising a predetermined number of bags, in the form of a right parallelepiped, to apply, during the formation of the stack, the edges of the bags opposite the bottoms on the bag cutting means and to bring these cutting means to a temperature such that they can ensure the fusion of the heat-sealable material over the entire height from the stack.
  • the invention also relates to a machine for implementing the above method.
  • this machine comprises a fixed heated element and a movable heated element coming into contact with the heat-sealable material in order to weld the bottom of the bag as well as cutting means, located downstream of these elements, considering the direction of movement of the material in the machine> ur to cut said material parallel, close to the weld, ac means, downstream of the above-mentioned elements and cutting means, considering the aforementioned direction of movement, to form and release at least one stack of bags, a transport member on which the stack of bags is formed, means for controlling this member arranged to animate it with an intermittent movement so that said member is stopped during the formation of the pile and that it sets in motion when the latter consists of a predetermined number of bags, means for maintaining, during the formation of the pile, the edge of the bags opposite their bottom in contact with the means of above cut as well as means for bringing said cutting means to a temperature sufficient to ensure the fusion of the heat-sealable material over the entire height of the p; " .
  • the aforementioned cutting means consist of a fixed knife, parallel to the heated element fixed to the machine, the edge of the knife intended to cut the material being located substantially in the same horizontal plane as the part of the incoming fixed heated element in contact with the heat-sealable material, the aforementioned means, for keeping the bags in contact with the knife, being arranged to apply the edges of the bags opposite their bottom against the face of the knife opposite the fixed heated element.
  • Figures 1 and 2 are schematic views, in perspective and partial, illustrating the above process and two particular embodiments for the implementation of the latter.
  • FIG. 3 is an elevation view, partially broken, of a machine according to the invention and corresponding to the embodiment shown in FIG. 2.
  • Figure 4 is a view along line IV-IV of Figure 3.
  • the process according to the invention is intended for the production of bundles 1 of bags 2, made of heat-weldable material, with solder 3 at the bottom 4 and having a weakening zone 5 parallel to the bottom 4 of the bag and located near the edge 6 of the bag opposite said bottom 4 to allow the bags to be torn off, one by one, from the bundle 1 and the opening, along the tearing line 7, of the bags.
  • This method consists in producing, in a manner known per se, the bags 2 one by one, superimposing them to form a stack 8, in the form of a straight parallelepiped and comprising a predetermined number of bags, carrying the bags 2 during the formation of the stack 8 and along their edge 6, at a temperature such that it can ensure the fusion of the heat-sealable material over the entire height of the stack, so that all the bags of the stack are joined together along their edge 6 to form a bundle, and finally to evacuate the latter when the predetermined number of bags is reached.
  • the edge 6 of the bags is subjected, during the formation of the stack 8, to the above-mentioned temperature permanently, but it would also be possible, according to the invention, to bring said edges 6 to the aforementioned temperature intermittently.
  • the machine according to the invention and shown in the drawings is a machine, intended to form bags for bottom welding from a sheath 9 of heat-sealable material, in which this sheath 9 is intermittently driven and welded and sectioned simultaneously to form the bottom of a bag and separate the previous bag from the sheath, by a system comprising a fixed heated element 10 and a movable heated element 11 coming into contact, when the sheath 9 is stopped, with the latter to carry out the bottom welding of the bag as well as cutting means 12 located downstream of the elements 10 and 11 considering the direction of advancement of the sheath in the machine, this sheath being moved downstream of the above system by a device 13 blowing the air under pressure on both sides of the duct.
  • the machine comprises, downstream of the aforementioned system, means 14 and 15 respectively arranged to form at least one stack 8 of bags 2 comprising a predetermined number of bags and to release the stack formed when the predetermined number of bags is reached, a member transport 16 for discharging the stack of bags, control means, known per se and not shown, for said member 16 arranged to animate it with an intermittent movement so that it is stopped during the formation of the stack 8 and that it sets in motion when the latter consists of a predetermined number of bags, means 17 for maintaining, during the formation of the stack 8, the edges 6 of the bags in contact with the means cutting 12 and means 18 for bringing said means 12 to a temperature sufficient to ensure the fusion of the heat-sealable material over the entire height of the stack 8, in order to bring the bags together, along said edges 6, to form a bundle 1 of bags.
  • the aforementioned transport member 16 advantageously consists of an endless belt 19 on which rests either wholly or partially, the stack 8 of bags in formation and the cutting means 12 are constituted by a fixed knife 20, parallel to the fixed heating element 10, the edge 21 of this knife being located in the same horizontal plane as the part 22 of the fixed heating element coming into contact with the sheath 9, the aforementioned means 17 for keeping the bags in contact with the knife 20 being arranged to apply the edges 6 of the bags against the face 23 of the knife opposite the element 10, this face 23 being planar and substantially vertical.
  • the aforementioned means 14 and 15 for forming and releasing the stacks of bags and the means 17 for keeping the edge 6 of the bags in contact with the face 23 of the stationary knife 20 comprise, in the embodiment of the machine illustrated in FIGS.
  • the aforementioned means 14, 15 and 17 comprise a section 25 fixed parallel to the mobile heated element 11 and having a wing 26 extending perpendicularly to the points 24 and having perforations 27 to allow passage to these points when the bags 2 are impaled on these when the element mobile heated 11 comes into contact with the fixed heated element 10, the lower face 28 of the wing 26 being situated at a level lower than that of the part 29 of the mobile heated element coming into contact with the sheath 9.
  • These means thus comprise a movable element 30.
  • the machine according to the invention also comprises, for tensioning the sheath and thereby ensuring a better cut thereof by the knife 20 and for applying safely, when the bags are impaled on the tips 24, the edge 6 of the bags on the face 23 of the knife 20, a pressure member 35, located downstream of the wing 26 of the profile 25 and associated with the movable heated element 11, intended to bear on the sheath 9, in its zone located at above the movable element 30, before the wing 26 and the element 11 come into contact with said material.
  • This member 35 consists of a bar 36, preferably made of elastic material, parallel to the movable heated element 11, of a frame 37 for said bar 36 and of elastic means 38 for fixing the frame to the element 11, these means 38 being arranged so that the bar 36 can move relative to the heated element 11, parallel to itself and substantially parallel to the tips 24 and so that its face 39 intended to bear on the sheath 9 is located, when the movable heated element 11 is in its position furthest from said sheath, at a level lower than that of the lower face 28 of the wing 26 of the profile 25 and at a level higher than that of the edge 21 of the knife, said means 38 being further arranged so that, when the movable heated element 11 cooperates with the fixed heated element 10, the face 39 of the bar can at least occupy a position situated in the plane passing through the face lower of the aforementioned wing of the profile .
  • said knife is supported at its ends by two flanges 40 each carrying a shaft 41 supported in the frame of the machine and offset with respect to the knife, said shafts 41 having an axis common 42, means 43 being provided on the flanges and arranged to control the pivoting of said flanges around the axis 42 in order to allow the knife to be released from the fixed heated element 10 and fixed tips 24.
  • the aforementioned means 14, 15 and 17 consist only of a stop 44 against which the bags are stopped, the latter then falling, by their own weight, onto the carpet without end 19 to form the stack 8 of bags, the stop 44 holding the edge 6 of the bags against the face 23 of the knife 20 so that the latter ensures the melting of the material along said edges 6, to produce the bundle of bags.
  • the stop 44 is equipped with a control means, known per se and not shown, which moves the stop in an alternating movement to move it away from the mat, so that it gives way to the finished bundle, before the start of said mat without end and return to its position relative to the latter when the bundle has been removed.
  • the latter could be fixed to the mobile heated element 11, said knife 20 being arranged so that, when it cuts the sheath 9, it comes into contact with intermittently with the edges 6 of the bags already stacked and ensures the fusion of the heat-sealable material, along these edges, to produce the bundle of bags.
  • the weakening zone 5 of the bags 1 can, of course, be carried out either upstream of the elements carrying out the welding, or in the bags already assembled in a bundle.

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Description

La présente invention a pour objet un procédé pour la fabrication de liasses de sacs, en matière thermosoudable, ces sacs étant du type à »soudure de fond« et présentant une zone d'affaiblissement parallèle au fond du sac et située à proximité du bord du sac opposé au fond de ce dernier pour permettre l'arrachage des sacs, un à un, de la liasse.The present invention relates to a process for the production of bundles of bags, made of heat-sealable material, these bags being of the "bottom weld" type and having a weakening zone parallel to the bottom of the bag and located near the edge of the bag opposite the bottom of the latter to allow the uprooting of the bags, one by one, from the bundle.

On connaît déjà divers procédés pour fabriquer des liasses de sacs en matière thermosoudable, du type à »soudure de fond«. Ces procédés sont répartis en deux catégories, à savoir, une première catégorie comprenant les procédés qui consistent à former une pile de sacs indépendants et, lorsque la pile est formée, à réunir les sacs entre eux pour former la liasse et une seconde catégorie comprenant les procédés qui consistent à, pendant la formation de la pile de sacs, réunir les sacs les uns aux autres. Les procédés appartenant aux deux catégories susdites offrent tout d'abord l'inconvénient que par leur mise en oeuvre, on fait appel à des organes chauffés pour l'assemblage des sacs qui sont distincts des éléments chauffés assurant la soudure du fond des sacs, ce qui complique notablement les machines automatiques pour la fabrication des liasses de sacs. De plus, les procédés suivant la première catégorie présentent soit l'inconvénient de nécessiter l'interruption de la fabrication des sacs pendant le temps relativement long nécessaire à l'assemblage des sacs d'une pile, ce qui ralentit la production des machines pour la mise en oeuvre de ces procédés, soit l'inconvénient de nécessiter des manipulations des liasses de sacs non assemblés pour les assembler à l'écart de la machine produisant les sacs, ce qui entraîne des risques sérieux de désorganisation des piles pendant leur transport et ce qui requiert de la main-d'oeuvre.Various processes are already known for manufacturing bundles of bags of heat-sealable material, of the "bottom weld" type. These processes are divided into two categories, namely, a first category comprising the processes which consist in forming a stack of independent bags and, when the stack is formed, in bringing the bags together to form the bundle and a second category comprising the processes which consist, during the formation of the stack of bags, in bringing the bags together. The processes belonging to the two aforementioned categories firstly offer the disadvantage that by their implementation, recourse is made to heated members for the assembly of the bags which are distinct from the heated elements ensuring the sealing of the bottom of the bags, this which considerably complicates automatic machines for the production of bundles of bags. In addition, the methods according to the first category have either the disadvantage of requiring the interruption of the production of the bags for the relatively long time necessary for the assembly of the bags from a stack, which slows down the production of the machines for the implementation of these methods, that is the drawback of requiring handling of the bundles of unassembled bags to assemble them away from the machine producing the bags, which entails serious risks of disorganization of the batteries during their transport and which requires labor.

On connaît notamment, suivant le brevet français N° 2 205 847, un procédé appartenant à la seconde catégorie susdite et qui consiste, pour former une pile de sacs, à empiler les sacs fabriqués et à réunir le sac qui vient d'être fabriqué au sac supérieur de la pile en formation. Ce procédé met en oeuvre une tringle de soudage assemblant les sacs l'un à l'autre qui est totalement indépendante des éléments formant la soudure de fond des sacs et sectionnant le sac formé de la gaine à partir de laquelle les sacs sont formés.Particularly known, according to French patent No. 2 205 847, a process belonging to the second category mentioned above and which consists, to form a stack of bags, to stack the bags produced and to bring together the bag which has just been manufactured in stack top bag in formation. This method uses a welding rod assembling the bags to each other which is completely independent of the elements forming the bottom weld of the bags and cutting the bag formed from the sheath from which the bags are formed.

Ce procédé, outre qu'il présente l'inconvénient précité de compliquer les machines automatiques du fait de la présence, pour sa mise en oeuvre, d'organes chauffés distincts des éléments chauffés servant à la fabrication des sacs, présente aussi l'inconvénient de procurer des liasses de sacs particulièrement fragiles du fait que les sacs sont réunis les uns aux autres sac par sac et qu'il suffit d'un ou plusieurs assemblages défectueux dans une pile pour que cette dernière se désagrège en plusieurs tronçons.This method, in addition to having the aforementioned drawback of complicating automatic machines due to the presence, for its implementation, of heated members distinct from the heated elements used for the manufacture of bags, also has the drawback of provide bundles of particularly fragile bags because the bags are joined to each other bag by bag and that one or more defective assemblies are sufficient in a stack for the latter to disintegrate into several sections.

L'invention a pour but de remédier aux inconvénients précités et de procurer un procédé, appartenant à la seconde catégorie susdite, dont la mise en oeuvre peut être aussurée, pour réunir les sacs en liasses, directement par les éléments qui réalisent la soudure de fond des sacs, ce qui permet de réduire de manière sensible la complexité des machines automatiques pour la formation des liasses de sacs, et ce qui permet d'obtenir des liasses de sacs particulièrement résistantes du fait que le procédé prévoit la liaison d'un sac à tous les sacs précédents.The object of the invention is to remedy the aforementioned drawbacks and to provide a method, belonging to the second category mentioned above, the implementation of which can be increased, for bringing together the bags in bundles, directly by the elements which perform the bottom welding. bags, which makes it possible to significantly reduce the complexity of automatic machines for forming bundles of bags, and which makes it possible to obtain bundles of bags which are particularly resistant since the method provides for the binding of a bag to all previous bags.

A cet effet, suivant l'invention, ledit procédé consiste à réaliser, d'une manière connue en soi, les sacs un à un, à les superposer pour former une pile, comprenant un nombre prédéterminé de sacs, en forme de parallélepipède droit, à appliquer, pendant la formation de la pile, les bords des sacs opposés aux fonds sur les moyens de coupe des sacs et à porter ces moyens de coupe à une température telle qu'ils puissent assurer la fusion de la matière thermosoudable sur toute la hauteur de la pile.To this end, according to the invention, said method consists in producing, in a manner known per se, the bags one by one, superimposing them to form a stack, comprising a predetermined number of bags, in the form of a right parallelepiped, to apply, during the formation of the stack, the edges of the bags opposite the bottoms on the bag cutting means and to bring these cutting means to a temperature such that they can ensure the fusion of the heat-sealable material over the entire height from the stack.

L'invention a également pour objet une machine pour la mise en oeuvre du procédé susdit.The invention also relates to a machine for implementing the above method.

Suivant l'invention, cette machine comprend un élément chauffé fixe et un élément chauffé mobile venant en contact avec la matière thermosoudable pour réaliser la soudure du fond du sac ainsi que des moyens de coupe, situés en aval de ces éléments en considérant le sens de défilement de la matière dans la machin >ur sectionner ladite matière parallèlemer, à proximité de la soudure, des moyens ac, es, en aval des éléments et moyens de coupe susdits en considérant le sens de défilement précité, pour former et libérer au moins une pile de sacs, un organe de transport sur lequel se forme la pile de sacs, des moyens de commande de cet organe agencés pour l'animer d'un mouvement intermittent de telle sorte que ledit organe est à l'arrêt pendant la formation de la pile et qu'il se met en mouvement lorsque cette dernière est constituée d'un nombre prédéterminé de sacs, des moyens pour maintenir, pendant la formation de la pile, le bord des sacs opposés à leur fond en contact avec les moyens de coupe susdits ainsi que des moyens pour porter lesdits moyens de coupe à une température suffisante pour assurer la fusion de la matière thermosoudable sur toute la hauteur de la p; ".According to the invention, this machine comprises a fixed heated element and a movable heated element coming into contact with the heat-sealable material in order to weld the bottom of the bag as well as cutting means, located downstream of these elements, considering the direction of movement of the material in the machine> ur to cut said material parallel, close to the weld, ac means, downstream of the above-mentioned elements and cutting means, considering the aforementioned direction of movement, to form and release at least one stack of bags, a transport member on which the stack of bags is formed, means for controlling this member arranged to animate it with an intermittent movement so that said member is stopped during the formation of the pile and that it sets in motion when the latter consists of a predetermined number of bags, means for maintaining, during the formation of the pile, the edge of the bags opposite their bottom in contact with the means of above cut as well as means for bringing said cutting means to a temperature sufficient to ensure the fusion of the heat-sealable material over the entire height of the p; " .

S tant un mode de réalisation avantageux de l'invontion, les moyens de coupe susdits sont constitués par un couteau fixe, parallèle à l'élément chauffé fixe à la machine, l'arête du couteau destinée à sectionner la matière étant située sensiblement dans le même plan horizontal que la partie de l'élément chauffé fixe entrant en contact avec la matière thermosoudable, les moyens précités, pour maintenir les sacs en contact avec le couteau, étant agencés pour appliquer les bords des sacs opposés à leur fond contre la face du couteau opposée à l'élement chauffé fixe.As an advantageous embodiment of the inversion, the aforementioned cutting means consist of a fixed knife, parallel to the heated element fixed to the machine, the edge of the knife intended to cut the material being located substantially in the same horizontal plane as the part of the incoming fixed heated element in contact with the heat-sealable material, the aforementioned means, for keeping the bags in contact with the knife, being arranged to apply the edges of the bags opposite their bottom against the face of the knife opposite the fixed heated element.

D'autres détails et particularités de l'invention ressortiront de la description des dessins annexés au présent mémoire et qui, à titre d'exemples non limitatifs, illustrent le procédé susdit et représentent deux formes de réalisation particulières de la machine suivant l'invention.Other details and particularities of the invention will emerge from the description of the drawings annexed to this specification and which, by way of nonlimiting examples, illustrate the above process and represent two particular embodiments of the machine according to the invention.

Les figures 1 et 2 sont des vues schématiques, en perspective et partielles, illustrant le procédé susdit ainsi que deux formes de réalisation particulières pour la mise en oeuvre de ce dernier.Figures 1 and 2 are schematic views, in perspective and partial, illustrating the above process and two particular embodiments for the implementation of the latter.

La figure 3 est une vue en élévation, avec brisures partielles, d'une machine suivant l'invention et correspondant à la forme de réalisation montrée à la figure 2.FIG. 3 is an elevation view, partially broken, of a machine according to the invention and corresponding to the embodiment shown in FIG. 2.

La figure 4 est une vue suivant la ligne IV-IV de la figure 3.Figure 4 is a view along line IV-IV of Figure 3.

Dans les différentes figures, les mêmes notations de référence désignent des éléments identiques ou analogues.In the different figures, the same reference notations designate identical or analogous elements.

Le procédé suivant l'invention, illustré aux figures 1 et 2, est destiné à la fabrication de liasses 1 de sacs 2, en matière thermosoudable, à soudure 3 de fond 4 et présentant une zone d'affaiblissement 5 parallèle au fond 4 du sac et située à proximité du bord 6 du sac opposé audit fond 4 pour permettre l'arrachage des sacs, un à un, de la liasse 1 et la réalisation, le long de la ligne d'arrachage 7, de l'ouverture des sacs. Ce procédé consiste à réaliser, d'une manière connue en soi, les sacs 2 un à un, à les superposer pour former une pile 8, en forme de parallélépipède droit et comprenant un nombre prédéterminé de sacs, à porter les sacs 2, pendant la formation de la pile 8 et le long de leur bord 6, à une température telle qu'elle puisse assurer la fusion de la matière thermosoudable sur toute la hauteur de la pile, de sorte que tous les sacs de la pile soient réunis entre eux le long de leur bord 6 pour former une liasse, et à évacuer enfin cette dernière lorsque le nombre prédéterminé de sacs est atteint. Dans les formes de réalisation montrées aux figures 1 et 2, le bord 6 des sacs est soumis, pendant la formation de la pile 8, à la température susdite de façon permanente, mais on pourrait également suivant l'invention, porter lesdits bords 6 à la température précitée de manière intermittente.The process according to the invention, illustrated in FIGS. 1 and 2, is intended for the production of bundles 1 of bags 2, made of heat-weldable material, with solder 3 at the bottom 4 and having a weakening zone 5 parallel to the bottom 4 of the bag and located near the edge 6 of the bag opposite said bottom 4 to allow the bags to be torn off, one by one, from the bundle 1 and the opening, along the tearing line 7, of the bags. This method consists in producing, in a manner known per se, the bags 2 one by one, superimposing them to form a stack 8, in the form of a straight parallelepiped and comprising a predetermined number of bags, carrying the bags 2 during the formation of the stack 8 and along their edge 6, at a temperature such that it can ensure the fusion of the heat-sealable material over the entire height of the stack, so that all the bags of the stack are joined together along their edge 6 to form a bundle, and finally to evacuate the latter when the predetermined number of bags is reached. In the embodiments shown in FIGS. 1 and 2, the edge 6 of the bags is subjected, during the formation of the stack 8, to the above-mentioned temperature permanently, but it would also be possible, according to the invention, to bring said edges 6 to the aforementioned temperature intermittently.

La machine suivant l'invention et montrée aux dessins est une machine, destinée à former des sacs à soudure de fond à partir d'une gaine 9 de matière thermosoudable, dans laquelle cette gaine 9 est entraînée par intermittence et soudée et sectionnée simultanément pour former le fond d'un sac et séparer de la gaine le sac précédent, par un système comprenant un élément chauffé fixe 10 et un élément chauffé mobile 11 venant en contact, lorsque la gaine 9 est à l'arrêt, avec cette dernière pour réaliser la soudure de fond du sac ainsi que des moyens de coupe 12 situés en aval des éléments 10 et 11 en considérant le sens d'avancement de la gaine dans la machine, cette gaine étant déplacée en aval du système susdit par un dispositif 13 soufflant de l'air sous pression de part et d'autre de la gaine. La machine comprend, en aval du système précité, des moyens 14 et 15 agencés respectivement pour former au moins une pile 8 de sacs 2 comprenant un nombre prédéterminé de sacs et pour libérer la pile formée lorsque le nombre prédéterminé de sacs est atteint, un organe de transport 16 pour évacuer la pile de sacs, des moyens de commande, connus en soi et non représentés, pour ledit organe 16 agencés pour l'animer d'un mouvement intermittent de manière à ce qu'il soit à l'arrêt pendant la formation de la pile 8 et qu'il se mette en mouvement lorsque cette dernière est constituée d'un nombre prédéterminé de sacs, des moyens 17 pour maintenir, pendant la formation de la pile 8, les bords 6 des sacs en contact avec les moyens de coupe 12 et des moyens 18 pour porter lesdits moyens 12 a une température suffisante pour assurer la fusion de la matière thermosoudable sur toute la hauteur de la pile 8, afin de réunir les sacs entre eux, le long desdits bords 6, pour former une liasse 1 de sacs.The machine according to the invention and shown in the drawings is a machine, intended to form bags for bottom welding from a sheath 9 of heat-sealable material, in which this sheath 9 is intermittently driven and welded and sectioned simultaneously to form the bottom of a bag and separate the previous bag from the sheath, by a system comprising a fixed heated element 10 and a movable heated element 11 coming into contact, when the sheath 9 is stopped, with the latter to carry out the bottom welding of the bag as well as cutting means 12 located downstream of the elements 10 and 11 considering the direction of advancement of the sheath in the machine, this sheath being moved downstream of the above system by a device 13 blowing the air under pressure on both sides of the duct. The machine comprises, downstream of the aforementioned system, means 14 and 15 respectively arranged to form at least one stack 8 of bags 2 comprising a predetermined number of bags and to release the stack formed when the predetermined number of bags is reached, a member transport 16 for discharging the stack of bags, control means, known per se and not shown, for said member 16 arranged to animate it with an intermittent movement so that it is stopped during the formation of the stack 8 and that it sets in motion when the latter consists of a predetermined number of bags, means 17 for maintaining, during the formation of the stack 8, the edges 6 of the bags in contact with the means cutting 12 and means 18 for bringing said means 12 to a temperature sufficient to ensure the fusion of the heat-sealable material over the entire height of the stack 8, in order to bring the bags together, along said edges 6, to form a bundle 1 of bags.

L'organe de transport 16 précité est avantageusement constitué par un tapis sans fin 19 sur lequel repose soit en totalité, soit partiellement, la pile 8 de sacs en formation et les moyens de coupe 12 sont constitués par un couteau fixe 20, parallèle à l'élément chauffé fixe 10, l'arête 21 de ce couteau étant située dans le même plan horizontal que la partie 22 de l'élément chauffé fixe entrant en contact avec la gaine 9, les moyens 17 précités pour maintenir les sacs en contact avec le couteau 20 étant agencés pour appliquer les bords 6 des sacs contre la face 23 du couteau opposée à l'élément 10, cette face 23 étant plane et sensiblement verticale. Les moyens 14 et 15 susdits pour former et libérer les piles de sacs et les moyens 17 pour maintenir le bord 6 des sacs en contact avec la face 23 du couteau fixe 20 comprennent, dans la forme de réalisation de la machine illustrée aux figures 2 à 4, des pointes fixes 24 disposées à proximité dudit couteau 20 en aval de ce dernier, en considérant le sens de déplacement de la gaine et en amont du tapis sans fin 19. Ces pointes 24, régulièrement espacées, sont alignées parallèlement au couteau 20 et sont sensiblement parallèles à la face 23 de ce dernier. De plus, ces pointes 24 s'étendent en dessous du plan horizontal passant par l'arête 21 du couteau et sur une hauteur égale à celle de la face 23 de ce dernier. Les moyens 14, 15 et 17 susdits comprennent un profilé 25 fixé parallèlement à l'élément chauffé mobile 11 et présentant une aile 26 s'étendant perpendiculairement aux pointes 24 et présentant des perforations 27 pour livrer passage à ces pointes lorsque les sacs 2 sont empalés sur celles-ci quand l'élément chauffé mobile 11 entre en contact avec l'élément chauffé fixe 10, la face inférieure 28 de l'aile 26 étant située à un niveau inférieur à celui de la partie 29 de l'élément chauffé mobile entrant en contact avec la gaine 9. Ces moyens comprennent ainsi un élément mobile 30. perforé en 31 pour livrer passage aux pointes 24 et sur la face supérieure 32 duquel prend appui la pile 8 de sacs en formation et des moyens, tels que vérins 33, pour animer cet élément 30 entre deux positions extrêmes suivant une direction parallèle à l'axe des pointes 24, une première position (représentée aux figures 2 à 4) dans laquelle sa face 32 est située en dessous du niveau de l'extrémité supérieure 34 des pointes afin de permettre l'empilage des sacs 2 sur ces dernières et une seconde position dans laquelle la face supérieure 32 de l'élément est située au-dessus du niveau de !'extrémité supérieure des pointes pour dégager de celles-ci la pile de sacs formées, le tapis sans fin 19 étant situé soit au même niveau, soit à un niveau inférieur à celui de la face supérieure 32 de l'élément 30 lorsqu'il occupe sa première position précitée.The aforementioned transport member 16 advantageously consists of an endless belt 19 on which rests either wholly or partially, the stack 8 of bags in formation and the cutting means 12 are constituted by a fixed knife 20, parallel to the fixed heating element 10, the edge 21 of this knife being located in the same horizontal plane as the part 22 of the fixed heating element coming into contact with the sheath 9, the aforementioned means 17 for keeping the bags in contact with the knife 20 being arranged to apply the edges 6 of the bags against the face 23 of the knife opposite the element 10, this face 23 being planar and substantially vertical. The aforementioned means 14 and 15 for forming and releasing the stacks of bags and the means 17 for keeping the edge 6 of the bags in contact with the face 23 of the stationary knife 20 comprise, in the embodiment of the machine illustrated in FIGS. 2 to 4, fixed tips 24 arranged near said knife 20 downstream of the latter, considering the direction of movement of the sheath and upstream of the endless belt 19. These tips 24, regularly spaced, are aligned parallel to the knife 20 and are substantially parallel to the face 23 of the latter. In addition, these points 24 extend below the horizontal plane passing through the edge 21 of the knife and over a height equal to that of the face 23 of the latter. The aforementioned means 14, 15 and 17 comprise a section 25 fixed parallel to the mobile heated element 11 and having a wing 26 extending perpendicularly to the points 24 and having perforations 27 to allow passage to these points when the bags 2 are impaled on these when the element mobile heated 11 comes into contact with the fixed heated element 10, the lower face 28 of the wing 26 being situated at a level lower than that of the part 29 of the mobile heated element coming into contact with the sheath 9. These means thus comprise a movable element 30. perforated at 31 to deliver passage to the points 24 and on the upper face 32 of which the stack 8 of bags in formation is supported and means, such as jacks 33, for animating this element 30 between two positions extremes in a direction parallel to the axis of the tips 24, a first position (shown in FIGS. 2 to 4) in which its face 32 is located below the level of the upper end 34 of the tips in order to allow the stacking of the bags 2 on the latter and a second position in which the upper face 32 of the element is located above the level of the upper end of the points to release from them the stack of bags formed, the endless belt 19 being located either at the same level, or at a level lower than that of the upper face 32 of the element 30 when it occupies its first position mentioned above.

La machine suivant l'invention comprend également, pour tendre la gaine et assurer de ce fait une meilleure coupe de celle-ci par le couteau 20 et pour appliquer de manière sûre, lorsque les sacs sont empalés sur les pointes 24, le bord 6 des sacs sur la face 23 du couteau 20, un organe de pression 35, situé en aval de l'aile 26 du profilé 25 et associé à l'élément chauffé mobile 11, destiné à prendre appui sur la gaine 9, dans sa zone située au-dessus de l'élément mobile 30, avant que l'aile 26 et l'élément 11 entrent en contact avec ladite matière. Cet organe 35 est constitué par un barreau 36, réalisé de préférence en matière élastique, parallèle à l'élément chauffé mobile 11, d'une armature 37 pour ledit barreau 36 et de moyens élastiques 38 de fixation de l'armature à l'élément 11, ces moyens 38 étant agencés pour que le barreau 36 puisse se déplacer par rapport à l'élément chauffé 11, parallèlement à luimême et sensiblement parallèlement aux pointes 24 et de manière à ce que sa face 39 destinée à prendre appui sur la gaine 9 soit située, lorsque l'élément chauffé mobile 11 est dans sa position la plus écartée de ladite gaine, à un niveau inférieur à celui de la face inférieure 28 de l'aile 26 du profilé 25 et à un niveau supérieur à celui de l'arête 21 du couteau, lesdits moyens 38 étant en outre agencés pour que, lorsque l'élément chauffé mobile 11 coopère avec l'élément chauffé fixe 10, la face 39 du barreau puisse au moins occuper une position située dans le plan passant par la face inférieure de l'aile précitée du profilé.The machine according to the invention also comprises, for tensioning the sheath and thereby ensuring a better cut thereof by the knife 20 and for applying safely, when the bags are impaled on the tips 24, the edge 6 of the bags on the face 23 of the knife 20, a pressure member 35, located downstream of the wing 26 of the profile 25 and associated with the movable heated element 11, intended to bear on the sheath 9, in its zone located at above the movable element 30, before the wing 26 and the element 11 come into contact with said material. This member 35 consists of a bar 36, preferably made of elastic material, parallel to the movable heated element 11, of a frame 37 for said bar 36 and of elastic means 38 for fixing the frame to the element 11, these means 38 being arranged so that the bar 36 can move relative to the heated element 11, parallel to itself and substantially parallel to the tips 24 and so that its face 39 intended to bear on the sheath 9 is located, when the movable heated element 11 is in its position furthest from said sheath, at a level lower than that of the lower face 28 of the wing 26 of the profile 25 and at a level higher than that of the edge 21 of the knife, said means 38 being further arranged so that, when the movable heated element 11 cooperates with the fixed heated element 10, the face 39 of the bar can at least occupy a position situated in the plane passing through the face lower of the aforementioned wing of the profile .

Pour permettre l'entretien du couteau 20 et son affûtage, ledit couteau est supporté, à ses extrémités, par deux flasques 40 portant chacun un arbre 41 supporté dans le bâti de la machine et décalé par rapport au couteau, lesdits arbres 41 ayant un axe commun 42, des moyens 43 étant prévus sur les flasques et agencés pour commander le pivotement desdits flasques autour de l'axe 42 afin de permettre le dégagement du couteau de l'élément chauffé fixe 10 et des pointes fixes 24.To allow maintenance of the knife 20 and its sharpening, said knife is supported at its ends by two flanges 40 each carrying a shaft 41 supported in the frame of the machine and offset with respect to the knife, said shafts 41 having an axis common 42, means 43 being provided on the flanges and arranged to control the pivoting of said flanges around the axis 42 in order to allow the knife to be released from the fixed heated element 10 and fixed tips 24.

Dans la forme de réalisation de la machine montrée à la figure 1, les moyens 14, 15 et 17 susdits sont constitués uniquement par une butée 44 contre laquelle les sacs sont arrêtés, ces derniers tombant alors, par leur propre poids, sur le tapis sans fin 19 pour former la pile 8 de sacs, la butée 44 maintenant le bord 6 des sacs contre la face 23 du couteau 20 afin que celui-ci assure la fusion de la matière le long desdits bords 6, pour réaliser la liasse de sacs. La butée 44 est équipée d'un moyen de commande, connu en soi et non représenté qui déplace la butée suivant un mouvement alternatif pour l'écarter du tapis, afin qu'elle livre passage à la liasse terminée, avant le démarrage dudit tapis sans fin et qu'elle reprenne sa position par rapport à ce dernier lorsque la liasse a été évacuée.In the embodiment of the machine shown in FIG. 1, the aforementioned means 14, 15 and 17 consist only of a stop 44 against which the bags are stopped, the latter then falling, by their own weight, onto the carpet without end 19 to form the stack 8 of bags, the stop 44 holding the edge 6 of the bags against the face 23 of the knife 20 so that the latter ensures the melting of the material along said edges 6, to produce the bundle of bags. The stop 44 is equipped with a control means, known per se and not shown, which moves the stop in an alternating movement to move it away from the mat, so that it gives way to the finished bundle, before the start of said mat without end and return to its position relative to the latter when the bundle has been removed.

Il doit être entendu que l'invention n'est nullement limitée aux formes de réalisation décrites et que bien des modifications peuvent être apportées à ces dernières sans sortir du cadre du présent brevet.It should be understood that the invention is in no way limited to the embodiments described and that many modifications can be made to these without departing from the scope of this patent.

C'est ainsi qu'au lieu de prévoir un couteau chauffé fixe 20, on pourrait fixer ce dernier à l'élément chauffé mobile 11, ledit couteau 20 étant agencé pour que, lorsqu'il coupe la gaine 9, il entre en contact de manière intermittente avec les bords 6 des sacs déjà empilés et assure la fusion de la matière thermosoudable, le long de ces bords, pour réaliser la liasse de sacs. La zone d'affaiblissement 5 des sacs 1 peut, bien entendu, être réalisée soit en amont des éléments effectuant la soudure, soit dans les sacs déjà réunis en liasse.Thus, instead of providing a fixed heated knife 20, the latter could be fixed to the mobile heated element 11, said knife 20 being arranged so that, when it cuts the sheath 9, it comes into contact with intermittently with the edges 6 of the bags already stacked and ensures the fusion of the heat-sealable material, along these edges, to produce the bundle of bags. The weakening zone 5 of the bags 1 can, of course, be carried out either upstream of the elements carrying out the welding, or in the bags already assembled in a bundle.

Claims (8)

1. Method for manufacturing bundles (1) of bags (2) from heat-sealable material, these bags being of »bottom seal« (3) type and having a weakened area (5) in parallel relationship with the bag bottom (4) and located adjacent that bag edge (6) opposite the bag bottom (4) to al!ow tearing the bags (2) one by one away from the bundle (1) and obtaining aI~ng the tearing line (7), the opening of said bags, said method which lies in manufacturing the bags (2) one by one, in superimposing them to form a pile comprising a determined number of bags, in the shape of a straight parallelepiped, in assembling the bags from the pile to form a bundle (1) and in discharging this letter one when the predetermined number of bags has been reached, being characterized in that during the forming of the bundle, one applies the bag edges (6) opposite to the bottoms (4) on the cutting means (12) for the bags and one brings these cutting means to such a temperature that they can insure fusing of the heatsealable material over the whole pile height.
2. Method according to claim 1, characterized in that during the forming of the bag pile, these bags are permanently applied along the edge (6) thereof opposite their bottom (4), on the cutting means.
3. Machine for the working of the method according to either one of claims 1 and 2, characterized in that it comprises a fixed heated element (11) and a movable heated element (11) contacting the heat-sealable material to make the seal (3) on the bag bottom (2) as well as cutting means (12), located downstream from these elements (10 and 11) when considering the material movement direction inside the machine, to cut said material parallel with and adjacent to the seal (3), means (14 and 15) arranged downstream from said elements (10 and 11) and cutting means (12) when considering said movement direction, to form and release at least one bag pile (8), a conveying member (16) over which the bag pile is formed, control means for this member so arranged as to impart thereto an intermittent movement in such a way that said member be stopped during the pile forming and starts moving when this pile is comprised of a predetermined number of bags, means (17) to hold during forming of the pile, the bag edge (6) opposite to the bag bottom contacting said cutting means (12), as well as means (18) to bring said cutting means (12) to a temperature high enough to insure fusing the heatsealable material over the whole height of the pile (8). 4 Machine according to claim 3, characterized in that said cutting means (12) are comprised of a fixed knife (20) in parallel relationship with the fixed heated element (10) from the machine, the adge (21) of the knife (20) for cutting the material being located substantially in the same horizontal plane as the part (22) from the fixed heated cement which contacts the heat-sealable material, said means (17) to hold the bags contacting the knife (20) being so arranged as to apply the bag edge (6) opposite to the bag bottom against the side (23) of the knife (20) opposite to the fixed heated element (10).
5. Machine according to claim 4, characterized in that the side (23) of the knife (20) opposite to the fixed heated element (10) is flat and substantially vertical.
6. Machine according to either one of the claims 4 and 5, characterized in that said means (14 and 15) for forming and releasing the bag piles and said means (17) for holding the adge (6) from said bags contacting the fixed knife are comprised of fixed points (24) arranged adjacent the knife (20) downstream thereof when considering the material movement direction inside the machine and upstream from said conveying member (16), these points (24) aligned in parallel relationshipe with the knife (20), being regularly spaced and substantially in parallel relationship with the side (23) of the knife opposite to the fixed heated element (10) and extending underneath said horizontal plane over a height equal to the height of the side (23) of the knife opposite to the fixed heated element, a section (25) secured in parallel relationship with the movable heated element (11) and having a perforated flange (26) extending at right angle to the fixed points, to let said points (24) through and impale the bags on these points when the movable heated element (11) contacts the fixed heated element (10), the inner side (28) of said flange (26) lying at a lower level than the part (29) of the movable heated element contacting the material to be sealed, a movable element (30) perforated in (31) to let the fixed points (24) through and on the upper side (32) of which bears the bag pile (8) being formed, lying in parallel relationship with said fixed heated element, and means such as jacks (33), to move said movable element 30 along a direction in parallel relationship with the point axis between two end positions, a first position in which the upper side (32) thereof lies below the level of the top end (34) of the points (24) to allow piling the bags (2) up on these points, and a second position in which the upper side (32) of the element lies above the level of the top end of the points to release the bag pile formed thereon, said conveying member (16) being located at the same level as or at a lower level than the level of the upper side (32) of said element 30 when this latter on lies in said first end position thereof
7. Machine according to claim 6. characterized in that it comprises downstream from the flange of said section, a pressure member (35) associated with the movable heated element (11) and intended to bear on the material to be sealed, in the area thereof located above said movable element (30), before said flange (26) and movable heated element (11) contacting said material, this pressure member (35) being comprised of a bar (36) preferably made from resilient material, in parallel relationship with the movable heated element (11), a frame (37) for said bar (36), and resilient means (38) for fastening said armature to the movable heated element (11), these latter means (38) being so arranged as to have the bar (36) movable relative to the movable heated element (11), in parallel relationship with itself and substantially in parallel relationship with the fixed points (24) and in such a way that the side j39) thereof intended to bear on the materiat be located when the movable heated element (11) lies in the position thereof farthest away from said material, at a lower level than the ievel of said side (28) of the flange (26) from the section (25) and at a level higher than the level of said edge (21) of the knife (20), said means (38) being moreover so arranged that when the movable heated element (11) is cooperating with the fixed heated element (10), said bar side (39) may at least lie in a position located inside the plane passing through the lower side of said section flange.
8. Machine according to any one of claims 4 to 7, characterized in that said knife (20) is supported at both ends thereof, by two cheeks (40) each bearing a shaft (41) supported in the machine frame and staggered relative to the knife, said shafts (41) having a common axis (42), means (43) being provided on the one cheek and so arranged as to control the swinging of said cheeks about said axis (42) to allow releasing the knife from the fixed heated element (10) and the fixed points (24).
EP78101728A 1977-12-19 1978-12-18 Process for making an interconnected series of bags and apparatus for carrying out this process Expired EP0002538B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE183584A BE862009A (en) 1977-12-19 1977-12-19 PROCESS FOR THE MANUFACTURING OF BAGS SETS AND MACHINE FOR IMPLEMENTING THIS PROCESS
BE183584 1977-12-19

Publications (3)

Publication Number Publication Date
EP0002538A2 EP0002538A2 (en) 1979-06-27
EP0002538A3 EP0002538A3 (en) 1979-07-25
EP0002538B1 true EP0002538B1 (en) 1982-08-04

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Application Number Title Priority Date Filing Date
EP78101728A Expired EP0002538B1 (en) 1977-12-19 1978-12-18 Process for making an interconnected series of bags and apparatus for carrying out this process

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EP (1) EP0002538B1 (en)
DE (1) DE2861994D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2597401B1 (en) * 1986-04-18 1988-08-05 Lagain Georges INSTALLATION FOR MANUFACTURING AND STACKING BAGS, BAGS, ETC. IN THERMOPLASTIC MATTER
FR2625946A1 (en) * 1988-01-15 1989-07-21 Lagain Georges INSTALLATION FOR MANUFACTURING AND STACKING BAGS, BAGS, ETC. IN THERMOPLASTIC MATTER

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2230993A1 (en) * 1972-06-24 1974-01-10 Hans Lehmacher Polyethylene carrier bags prepn - heat sealed together in a block and with additional reinforcing base seam
DE2254448A1 (en) * 1972-11-07 1974-05-22 Windmoeller & Hoelscher METHOD AND DEVICE FOR THE PRODUCTION OF BAG BLOCKS FROM THERMOPLASTIC PLASTIC
FR2250632A1 (en) * 1973-11-08 1975-06-06 Printex Plastic bags for stacking - formed by intermittently cutting and welding continuous plastic tube
DE2358281A1 (en) * 1973-11-22 1975-06-05 Windmoeller & Hoelscher Blocks of bags from thermoplastic tubular film - using rotary bottom jaw of welder and shear ensuring smooth workflow

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DE2861994D1 (en) 1982-09-30
EP0002538A3 (en) 1979-07-25
EP0002538A2 (en) 1979-06-27

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