EP3277596A1 - Method for continuously manufacturing a plastic bag for food products - Google Patents

Method for continuously manufacturing a plastic bag for food products

Info

Publication number
EP3277596A1
EP3277596A1 EP16717424.2A EP16717424A EP3277596A1 EP 3277596 A1 EP3277596 A1 EP 3277596A1 EP 16717424 A EP16717424 A EP 16717424A EP 3277596 A1 EP3277596 A1 EP 3277596A1
Authority
EP
European Patent Office
Prior art keywords
weld line
oblique
transverse
bag
bellows
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16717424.2A
Other languages
German (de)
French (fr)
Other versions
EP3277596B1 (en
Inventor
Eric Albert Léon VALETTE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coveris Flexibles France SA
Original Assignee
Coveris Flexibles France SA
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 Coveris Flexibles France SA filed Critical Coveris Flexibles France SA
Priority to PL16717424T priority Critical patent/PL3277596T3/en
Publication of EP3277596A1 publication Critical patent/EP3277596A1/en
Application granted granted Critical
Publication of EP3277596B1 publication Critical patent/EP3277596B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • 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
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0012—Flexible containers made from webs by folding webs longitudinally having their openings facing in the direction of movement
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/30—Shape of flexible containers pointed or tapered
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/148—Cutting-out portions from the sides of webs or sheets
    • 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

Definitions

  • the invention relates to the technical sector of plastic packaging bags, especially for the packaging of food products.
  • the invention relates to a preformed flexible plastic bag, in particular obtained from a film of thickness less than 200 ⁇ , approximately.
  • This type of bag comprises a front wall and a rear wall assembled at their lateral sides, in combination with bellows, delimiting a bottom and a filling opening.
  • these preformed bags are made continuously, from a single plastic film, such as PE with or without added OPP, or PE added with PET, or any other materials perfectly known for a skilled in the art commonly employed in the field of food packaging.
  • the plastic film is subjected continuously to successive operations of folding and welding, to make a bag as such, with as indicated, a bottom, two walls, joined by bellows, and a filling opening opposite to background.
  • the external pleats, at the bellows and wall connections, are assembled by continuous welding lines.
  • the bottom of the bag is made by any known and appropriate means.
  • the side gussets are spread apart, thus giving volume to the shape of the bag, and indirectly, participate in the formation of a bottom, to allow to maintain the bag in a vertical position, or substantially vertical.
  • This stability is also important for the storage and presentation of bags.
  • the invention proposes an alternative solution to solve the problem of improving stability, while aiming to reduce the thickness, and improve the aesthetics of the bag.
  • it has been designed and developed a method for continuously manufacturing a food packaging bag from a plastic film sheath, a method according to which:
  • the film is subjected to successive bending operations to produce lateral gussets between two walls
  • a longitudinal weld line is produced at the connection of the external edges of the bellows with the walls;
  • a transverse weld line constituting a bottom is produced at regular intervals;
  • an oblique welding line is produced at regular intervals between the external edges of the bellows and the transverse weld line constituting the bottom,
  • a cut is made at the bottom having symmetrically, on either side, the oblique lines, to form an opening of the bag.
  • the obtained plastic food product packaging bag comprising a front wall and a rear wall assembled, on the one hand, at their lateral sides, in combination with bellows forming two folds, and secondly at one of their transverse side with said bellows, to form a bottom.
  • the outer lateral edges of the bellows are connected to the bottom by oblique cutting lines, so that after filling of the bag corresponding to the spacing of the bellows, said oblique lines form symmetrically, on either side of the bottom, a clearance in triangle, without overthickness, thus improving the stability of said bag in vertical filling position.
  • the triangle-shaped clearances are located on either side of the median zone of the bottom avoiding any extra thickness, since the fold is limited in length, and is located, as indicated, only at the the middle part of the bottom. It is also possible to equip the bottom, labels or others. According to other features, the oblique cut lines are formed from the bottom and the median line of the two folds of each bellows.
  • the outer edges of the bellows, at their connection with the walls, including the oblique cutting lines, have a weld zone.
  • FIG. 1 is a perspective view of a bag, according to the invention
  • FIG. 2 is a flat front view of the film
  • FIG. 3 is a side view, corresponding to FIG. 2, in position away from the folds of one of the bellows,
  • FIG. 4 is a front view of the bag, in the filled position
  • FIG. 5 is a side view, corresponding to FIG. 4;
  • FIG. 6 is a bottom view, corresponding to FIG. 4;
  • FIG. 7 is a schematic plan view showing the continuous manufacturing process of a bag, according to the characteristics of the invention
  • - Figure 8 is a detailed view of the encircled area shown in Figure 7, illustrating the cutting of a triangular area, and the cut with the double blade.
  • the bag for food products designated as a whole by (1) is made of a flexible plastic material, in particular of thickness less than 200 ⁇ .
  • the bag is, in a perfectly known manner, obtained from a roll of film unrolled continuously, and subjected to various operations, including automatic folding and welding.
  • the resulting bag has a front wall (1a) and a rear wall (1b) assembled at their lateral sides in combination with bellows (1a) and (1d).
  • the bag has, moreover, a bottom (the) and a filling opening (lf).
  • Each of the bellows (le) and (ld) form two folds (a) and (b).
  • the bottom (the) is welded at the connection of one of the transverse sides of the walls, with the bellows.
  • the oblique cutting lines are formed from the bottom (the) and the center line (c) of the two folds (a) and (b) of each bellows.
  • a longitudinal weld line (L1) is made at the connection of the outer edges of the bellows with the front and rear walls.
  • a transverse weld line (L2) constituting the bottom (1c) is formed, and an oblique weld line (L3) between the outer walls of each of the bellows and the weld line (L2) constituting the bottom , [step (A)].
  • the oblique weld lines (L3) and the transverse weld lines (L2) are made one after the other in separate steps, and with separate tools. The order in which his lines is not important.
  • the oblique weld lines (L3) can be made before or after the transverse weld lines (L2).
  • the method is more flexible in that it is possible to vary the inclination of the oblique welds or to move them transversely, and thus to modify the manufactured bag, without having to change tools.
  • These characteristics also make it possible to adjust the position of the oblique lines (L3) according to the dimensional differences found in the manufacturing process.
  • the manufacturing process is simple, fast, and accurate.
  • the triangular zone (T) resulting from the weld lines (L1) (L2) and (L3), [step (B)] is cut.
  • cut can be shaped so as to achieve rounded edges, or not.
  • the cut is advantageously made from the outer edge of the bellows (1a, 1d), along the outer edge of the oblique weld line (L3), to the outer edge of the transverse weld line (L2), then the cut is continued transversely towards the inside of the plastic film sheath along the outer edge of the transverse weld line (L2) to make a half-circle while moving away of the transverse welding line (L2) to go back and continue cutting transversely to the outer edge of the sheath, parallel to the transverse weld line (L2).
  • a section is produced at the level of the weld line (L2), symmetrically presenting on both sides the oblique weld lines (L3) to form the opening of the bag [step (C)] .
  • this cutting is performed by a double blade, the spacing of the blades allows for cutting by setting on either side the transverse cuts made during the cutting of the triangular areas (see Figure 8).
  • the transverse weld lines formed during the cutting of the triangular areas are found arranged between the two blades during the double cutting.

Landscapes

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

Abstract

Method for continuously manufacturing a bag for packaging food products from a sheet of plastic film, according to which: -the film is subjected to successive folding operations so as to produce lateral gussets (1c, 1d) between two walls (1a, 1b), -a longitudinal weld line (L1) is made at the connection of the external edges of the gussets (1c, 1d) to the walls (1a, 1b), -a transverse weld line (L2) forming a bottom (1e) is made at regular intervals, -an oblique weld line (L3) is made at regular intervals between the external edges of the gussets (1c, 1d) and the transverse weld line (L2) forming the bottom (1e), -a triangular zone produced by the oblique weld lines (L3) and the bottom (1e) is cut out, -a cut is made at the bottom (1e) having symmetrically, on both sides, oblique lines so as to form a bag opening.

Description

PROCEDE DE FABRICATION EN CONTINU D'UN SAC EN MATIERE PLASTIQUE POUR PRODUITS ALIMENTAIRES  PROCESS FOR THE CONTINUOUS PRODUCTION OF A PLASTIC BAG FOR FOOD PRODUCTS
L'invention se rattache au secteur technique des sacs d'emballage en matière plastique, notamment pour l'emballage de produits alimentaires. The invention relates to the technical sector of plastic packaging bags, especially for the packaging of food products.
Plus particulièrement, l'invention concerne un sac pré formé en matière plastique flexible, notamment obtenu à partir d'un film d'épaisseur inférieure à 200 μηι, environ. More particularly, the invention relates to a preformed flexible plastic bag, in particular obtained from a film of thickness less than 200 μηι, approximately.
Ce type de sac comprend une paroi avant et une paroi arrière assemblées au niveau de leurs côtés latéraux, en combinaison avec des soufflets, en délimitant un fond et une ouverture de remplissage. This type of bag comprises a front wall and a rear wall assembled at their lateral sides, in combination with bellows, delimiting a bottom and a filling opening.
De manière connue, ces sacs préformés sont réalisés en continu, à partir d'un seul film en matière plastique, tel que du PE additionné ou non d'OPP, ou bien du PE additionné de PET, ou toutes autres matières parfaitement connues pour un homme du métier couramment employées dans le domaine de l'emballage alimentaire. Le film en matière plastique est soumis en continu à des opérations successives de pliage et de soudage, pour réaliser un sac en tant que tel, avec comme indiqué, un fond, deux parois, réunies par des soufflets, et une ouverture de remplissage opposée au fond.  In known manner, these preformed bags are made continuously, from a single plastic film, such as PE with or without added OPP, or PE added with PET, or any other materials perfectly known for a skilled in the art commonly employed in the field of food packaging. The plastic film is subjected continuously to successive operations of folding and welding, to make a bag as such, with as indicated, a bottom, two walls, joined by bellows, and a filling opening opposite to background.
Généralement, les plis externes, au niveau du raccordement des soufflets et des parois, sont assemblés par des lignes de soudure en continu. Le fond du sac est réalisé par tous moyens connus et appropriés.  Generally, the external pleats, at the bellows and wall connections, are assembled by continuous welding lines. The bottom of the bag is made by any known and appropriate means.
Sous un effet de remplissage du sac, les soufflets latéraux sont écartés, donnant ainsi du volume à la forme du sac, et indirectement, participent à la formation d'un fond, afin de permettre de maintenir le sac en position verticale, ou sensiblement verticale. Under a filling effect of the bag, the side gussets are spread apart, thus giving volume to the shape of the bag, and indirectly, participate in the formation of a bottom, to allow to maintain the bag in a vertical position, or substantially vertical.
Il apparaît, toutefois, que la formation du fond nécessite souvent des opérations de pliage, et ne constitue pas une embase apte à assurer une parfaite stabilité en position verticale, ou sensiblement verticale du sac.  It appears, however, that the formation of the bottom often requires folding operations, and does not constitute a base capable of ensuring perfect stability in vertical position, or substantially vertical bag.
Ce problème de stabilité peut poser des problèmes importants lors du conditionnement du sac, après remplissage, sur une machine automatique. En effet, il est important que les sacs puissent rester parfaitement stables, par exemple, lors de leur transport de postes en postes, afin de les soumettre, dans de bonnes conditions, aux opérations sélectionnées, et d'éviter tous phénomènes de renversement de leurs contenus. This problem of stability can pose significant problems when packaging the bag, after filling, on an automatic machine. Indeed, it is important that the bags can remain perfectly stable, for example, during their transport of positions in positions, in order to subject them, under good conditions, to the selected operations, and to avoid any phenomena of reversal of their content.
Cette stabilité est également importante pour le stockage et la présentation des sacs. This stability is also important for the storage and presentation of bags.
Pour tenter de remédier à ces inconvénients, une solution ressort, par exemple, de l'enseignement du brevet FR 2 833 928, qui prévoit de créer, sur au moins l'une des parois du sac une ligne de marquage, apte à constituer une zone de pliure déterminée pour former et délimiter le fond par rapport aux parois, en créant une embase d'appui sous l'effet de l'écartement des soufflets. In an attempt to remedy these drawbacks, a solution emerges, for example, from the teaching of patent FR 2 833 928, which provides for creating, on at least one of the walls of the bag, a marking line capable of constituting a folding zone determined to form and delimit the bottom relative to the walls, creating a support base under the effect of the spacing of the bellows.
Cette solution est efficace, mais essentiellement adaptée lorsque le fond résulte d'une opération de pliage et de soudage à la partie inférieure des parois du sac.  This solution is effective, but essentially suitable when the bottom results from a folding operation and welding at the bottom of the walls of the bag.
L'invention propose une autre solution, pour résoudre le problème posé d'améliorer la stabilité, tout en ayant pour objectif de diminuer les épaisseurs, et d'améliorer l'esthétique du sac. Pour résoudre un tel problème, il a été conçu et mis au point un procédé de fabrication en continu d'un sac d'emballage pour produits alimentaires, à partir d'une gaine de film en matière plastique, procédé selon lequel : The invention proposes an alternative solution to solve the problem of improving stability, while aiming to reduce the thickness, and improve the aesthetics of the bag. To solve such a problem, it has been designed and developed a method for continuously manufacturing a food packaging bag from a plastic film sheath, a method according to which:
- on soumet le film à des opérations de pliages successifs pour réaliser des soufflets latéraux entre deux parois,  the film is subjected to successive bending operations to produce lateral gussets between two walls,
- on réalise une ligne de soudure longitudinale au niveau du raccordement des bords externes des soufflets avec les parois, - on réalise à intervalles réguliers une ligne de soudure transversale constituant un fond,  a longitudinal weld line is produced at the connection of the external edges of the bellows with the walls; a transverse weld line constituting a bottom is produced at regular intervals;
- on réalise à intervalles réguliers une ligne de soudure oblique entre les bords externes des soufflets et la ligne de soudure transversale constituant le fond,  an oblique welding line is produced at regular intervals between the external edges of the bellows and the transverse weld line constituting the bottom,
- on découpe une zone triangulaire résultant des lignes de soudures obliques et de fond,  a triangular zone resulting from the lines of oblique and bottom welds is cut out,
- on réalise une coupe au niveau du fond présentant symétriquement, de part et d'autre, les lignes obliques, pour former une ouverture du sac.  - A cut is made at the bottom having symmetrically, on either side, the oblique lines, to form an opening of the bag.
Ainsi, le sac d'emballage en matière plastique de produits alimentaires obtenu comprenant une paroi avant et une paroi arrière assemblées, d'une part, au niveau de leurs côtés latéraux, en combinaison avec des soufflets formant deux plis, et d'autre part, au niveau de l'un de leur côté transversal avec lesdits soufflets, pour former un fond. Thus, the obtained plastic food product packaging bag comprising a front wall and a rear wall assembled, on the one hand, at their lateral sides, in combination with bellows forming two folds, and secondly at one of their transverse side with said bellows, to form a bottom.
Les bords latéraux extérieurs des soufflets sont raccordés au fond par des lignes de coupe obliques, de sorte qu'après remplissage du sac correspondant à l'écartement des soufflets, lesdites lignes obliques forment symétriquement, de part et d'autre du fond, un dégagement en triangle, sans surépaisseur, améliorant ainsi la stabilité dudit sac, en position verticale de remplissage. The outer lateral edges of the bellows are connected to the bottom by oblique cutting lines, so that after filling of the bag corresponding to the spacing of the bellows, said oblique lines form symmetrically, on either side of the bottom, a clearance in triangle, without overthickness, thus improving the stability of said bag in vertical filling position.
Il résulte de ces caractéristiques que les dégagements en forme de triangle sont situés de part et d'autre de la zone médiane du fond évitant toute surépaisseur, étant donné que le pli est limité en longueur, et est situé, comme indiqué, seulement au niveau de la partie médiane du fond. Il est, par ailleurs, possible d'équiper le fond, d'étiquettes ou autres. Selon d'autres caractéristiques, les lignes de coupes obliques sont formées à partir du fond et de la ligne médiane des deux plis de chaque soufflet. It follows from these characteristics that the triangle-shaped clearances are located on either side of the median zone of the bottom avoiding any extra thickness, since the fold is limited in length, and is located, as indicated, only at the the middle part of the bottom. It is also possible to equip the bottom, labels or others. According to other features, the oblique cut lines are formed from the bottom and the median line of the two folds of each bellows.
Les bords externes des soufflets, au niveau de leur raccordement avec les parois, y compris au niveau des lignes de coupe obliques, présentent une zone de soudure.  The outer edges of the bellows, at their connection with the walls, including the oblique cutting lines, have a weld zone.
L'invention est exposée ci-après plus en détail à l'aide des figures des dessins annexés, dans lesquels : The invention is described below in more detail with reference to the figures of the accompanying drawings, in which:
- la figure 1 est une vue en perspective d'un sac, selon l'invention, - la figure 2 est une vue à plat et de face du film,  FIG. 1 is a perspective view of a bag, according to the invention; FIG. 2 is a flat front view of the film,
- la figure 3 est une vue de côté, correspondant à la figure 2, en position écartée des plis de l'un des soufflets,  FIG. 3 is a side view, corresponding to FIG. 2, in position away from the folds of one of the bellows,
- la figure 4 est une vue de face du sac, en position remplie, FIG. 4 is a front view of the bag, in the filled position,
- la figure 5 est une vue de côté, correspondant à la figure 4, - la figure 6 est une vue de dessous, correspondant à la figure 4,FIG. 5 is a side view, corresponding to FIG. 4; FIG. 6 is a bottom view, corresponding to FIG. 4;
- la figure 7 est une vue en plan, à caractère schématique, montrant le procédé de fabrication en continu d'un sac, selon les caractéristiques de l'invention, - la figure 8 est une vue de détail de la zone encerclée apparaissant sur la figure 7, illustrant la découpe d'une zone triangulaire, et la découpe avec la double lame. D'une manière parfaitement connue, le sac pour produits alimentaires désigné dans son ensemble par (1) est réalisé dans une matière plastique flexible, notamment d'épaisseur inférieure à 200 μηι. Le sac est, de manière parfaitement connue, obtenu à partir d'une bobine de film déroulée en continu, et soumise à différentes opérations, notamment de pliage et de soudure réalisées en automatique. FIG. 7 is a schematic plan view showing the continuous manufacturing process of a bag, according to the characteristics of the invention, - Figure 8 is a detailed view of the encircled area shown in Figure 7, illustrating the cutting of a triangular area, and the cut with the double blade. In a perfectly known manner, the bag for food products designated as a whole by (1) is made of a flexible plastic material, in particular of thickness less than 200 μηι. The bag is, in a perfectly known manner, obtained from a roll of film unrolled continuously, and subjected to various operations, including automatic folding and welding.
Il en résulte que le sac obtenu présente une paroi avant (la) et une paroi arrière (lb) assemblées au niveau de leurs côtés latéraux en combinaison avec des soufflets (le,) et (ld). Le sac présente, par ailleurs, un fond (le) et une ouverture de remplissage (lf).  As a result, the resulting bag has a front wall (1a) and a rear wall (1b) assembled at their lateral sides in combination with bellows (1a) and (1d). The bag has, moreover, a bottom (the) and a filling opening (lf).
Chacun des soufflets (le) et (ld) forment deux plis (a) et (b). Le fond (le) est soudé au niveau du raccordement d'un des côtés transversaux des parois, avec les soufflets. Selon l'invention, les bords latéraux externes des soufflets (le) etEach of the bellows (le) and (ld) form two folds (a) and (b). The bottom (the) is welded at the connection of one of the transverse sides of the walls, with the bellows. According to the invention, the external lateral edges of the bellows (the) and
(ld), au niveau de leur raccordement avec les parois avant et arrière du sac, sont raccordés au fond (le) par des lignes de coupe obliques (Ici) (lc2) et (ldl) et (ld2) (figures 2, 3 et 6). (ld), at their connection with the front and rear walls of the bag, are connected to the bottom (the) by oblique cutting lines (Here) (lc2) and (ldl) and (ld2) (Figures 2, 3 and 6).
Les lignes de coupe obliques sont formées à partir du fond (le) et de la ligne médiane (c) des deux plis (a) et (b) de chaque soufflet.  The oblique cutting lines are formed from the bottom (the) and the center line (c) of the two folds (a) and (b) of each bellows.
Les bords latéraux externes des soufflets (le, ld), au niveau de leur raccordement avec les parois avant (la) et arrière (lb), y compris au niveau des lignes de coupe obliques, présentent une ligne de soudure (L). Il résulte de ces caractéristiques, qu'après remplissage du sac, correspondant à l'écartement des soufflets (le, ld), les différentes lignes obliques forment symétriquement, de part et d'autre du fond (le), un dégagement en forme de triangle (T), figure 6. Ces dégagements en forme de triangle sont donc situés symétriquement, de part et d'autre du fond (le) et ne présentent aucune surépaisseur. La surépaisseur, constituée par le fond (le), est donc limitée entre les deux dégagements en triangle (T), autrement dit, sur une longueur réduite. On renvoie à la figure 7, qui montre le procédé de fabrication en continu d'un sac d'emballage de produits alimentaires, selon les caractéristiques de l'invention à partir d'une gaine d'un film en matière plastique. On soumet le film à des opérations de pliages successifs pour réaliser les soufflets latéraux entre deux parois. The external lateral edges of the bellows (1a, 1d), at their connection with the front (1a) and rear (1b) walls, including at the oblique cutting lines, have a weld line (L). It follows from these characteristics, that after filling the bag, corresponding to the spacing of the bellows (le, ld), the different oblique lines form symmetrically, on either side of the bottom (the), a clearance in the form of triangle (T), Figure 6. These clearances in the form of triangle are located symmetrically, on either side of the bottom (the) and have no extra thickness. The extra thickness, constituted by the bottom (the), is therefore limited between the two clearances in triangle (T), in other words, on a reduced length. Referring to Figure 7, which shows the method of continuously manufacturing a food packaging bag, according to the features of the invention from a sheath of a plastic film. The film is subjected to successive bending operations to achieve the lateral bellows between two walls.
On réalise une ligne de soudure longitudinale (Ll), au niveau du raccordement des bords externes des soufflets avec les parois avant et arrière. A longitudinal weld line (L1) is made at the connection of the outer edges of the bellows with the front and rear walls.
On réalise à intervalles réguliers, une ligne de soudure transversale (L2) constituant le fond (le), et une ligne de soudure oblique (L3) entre les parois externes de chacun des soufflets et la ligne de soudure (L2), constituant le fond, [étape (A)]. At regular intervals, a transverse weld line (L2) constituting the bottom (1c) is formed, and an oblique weld line (L3) between the outer walls of each of the bellows and the weld line (L2) constituting the bottom , [step (A)].
Les lignes de soudures obliques (L3) et les lignes de soudures transversales (L2) sont réalisées les unes après les autres selon des étapes distinctes, et avec des outils distincts. L'ordre dans lequel sont réalisées ses lignes n'est pas important. Les lignes de soudures obliques (L3) peuvent être réalisées avant ou après les lignes de soudures transversales (L2). Le fait que les lignes de soudures obliques (L3) soient réalisées indépendamment des lignes de soudures transversales (L2), et avec des outils distincts, permet de pouvoir adapter ou ajuster au besoin la position des lignes de soudures obliques (L3) par rapport aux lignes de soudures transversales (L2). Ainsi, le procédé est plus flexible en ce sens qu'il est possible de varier l'inclinaison des soudures obliques ou de les déplacer transversalement, et donc de modifier le sac fabriqué, sans devoir changer d'outil. Ces caractéristiques permettent également de pouvoir ajuster la position des lignes obliques (L3) en fonction des écarts dimensionnels constatés dans le procédé de fabrication. Le procédé de fabrication est simple, rapide, et précis. On découpe, ensuite, la zone triangulaire (T) résultant des lignes de soudure (Ll) (L2) et (L3), [étape (B)]. The oblique weld lines (L3) and the transverse weld lines (L2) are made one after the other in separate steps, and with separate tools. The order in which his lines is not important. The oblique weld lines (L3) can be made before or after the transverse weld lines (L2). The fact that the oblique weld lines (L3) are made independently of the transverse weld lines (L2), and with separate tools, makes it possible to adapt or adjust as necessary the position of the lines of oblique welds (L3) with respect to transverse weld lines (L2). Thus, the method is more flexible in that it is possible to vary the inclination of the oblique welds or to move them transversely, and thus to modify the manufactured bag, without having to change tools. These characteristics also make it possible to adjust the position of the oblique lines (L3) according to the dimensional differences found in the manufacturing process. The manufacturing process is simple, fast, and accurate. Then, the triangular zone (T) resulting from the weld lines (L1) (L2) and (L3), [step (B)] is cut.
A noter que la découpe peut être conformée de manière à réaliser des bords arrondis, ou non.  Note that the cut can be shaped so as to achieve rounded edges, or not.
De plus, en référence à la figure 8, la découpe est avantageusement effectuée à partir du bord externe des soufflets (le, ld), en longeant le bord externe de la ligne de soudure oblique (L3), jusqu'au bord externe de la ligne de soudure transversale (L2), puis la découpe est poursuivie transversalement vers l'intérieur de la gaine de film plastique en longeant le bord externe de la ligne de soudure transversale (L2) jusqu'à faire un demi- cercle en s 'éloignant de la ligne de soudure transversale (L2) pour revenir en arrière et poursuivre la découpe transversalement jusqu'au bord externe de la gaine, parallèlement à la ligne de soudure transversale (L2). On réalise ensuite, de manière connue, une coupe au niveau de la ligne de soudure (L2), présentant symétriquement de part et d'autre les lignes de soudure obliques (L3) pour former l'ouverture du sac [étape (C)]. De préférence, cette découpe est effectuée par une double lame, dont l'écartement des lames permet de réaliser une découpe en cernant de part et d'autre les découpes transversales réalisées lors de la découpe des zones triangulaires (voir figure 8). En d'autres termes, les lignes de soudures transversales réalisées lors de la découpe des zones triangulaires se retrouvent agencées entre les deux lames lors de la double découpe. In addition, with reference to FIG. 8, the cut is advantageously made from the outer edge of the bellows (1a, 1d), along the outer edge of the oblique weld line (L3), to the outer edge of the transverse weld line (L2), then the cut is continued transversely towards the inside of the plastic film sheath along the outer edge of the transverse weld line (L2) to make a half-circle while moving away of the transverse welding line (L2) to go back and continue cutting transversely to the outer edge of the sheath, parallel to the transverse weld line (L2). Then, in a known manner, a section is produced at the level of the weld line (L2), symmetrically presenting on both sides the oblique weld lines (L3) to form the opening of the bag [step (C)] . Preferably, this cutting is performed by a double blade, the spacing of the blades allows for cutting by setting on either side the transverse cuts made during the cutting of the triangular areas (see Figure 8). In other words, the transverse weld lines formed during the cutting of the triangular areas are found arranged between the two blades during the double cutting.
De cette manière, la découpe avec la double lame, autour des découpes transversales réalisées lors de la découpe des zones triangulaires, permet d'avoir une finition optimale du sac, avec des bords arrondis et sans partie saillante. In this way, the cutting with the double blade, around the transverse cuts made during the cutting of the triangular areas, allows for an optimal finish of the bag, with rounded edges and without protruding part.
Les avantages ressortent bien de la description. En particulier, on souligne et on rappelle : The advantages are apparent from the description. In particular, we emphasize and remind:
- l'esthétique obtenue,  - the aesthetics obtained,
- une diminution des épaisseurs,  a decrease in thicknesses,
- la stabilité obtenue,  the stability obtained,
- la possibilité de mettre des étiquettes ou des marquages, au niveau du fond.  - the possibility of putting labels or markings at the bottom.

Claims

R E V E N D I C A T I O N S  R E V E N D I C A T IO N S
-1- Procédé de fabrication en continu d'un sac d'emballage de produits alimentaires, à partir d'une gaine d'un film de matière plastique, selon lequel : -1- A method of continuously manufacturing a food packaging bag, from a sheath of a plastic film, according to which:
- on soumet le film à des opérations de pliages successifs pour réaliser des soufflets latéraux (le, ld) entre deux parois (la, lb),  the film is subjected to successive bending operations in order to produce lateral gussets (1a, 1d) between two walls (1a, 1b),
- on réalise une ligne de soudure longitudinale (Ll) au niveau du raccordement des bords externes des soufflets (le, ld) avec les parois (la, lb),  a longitudinal weld line (Ll) is produced at the connection of the external edges of the bellows (1a, 1d) with the walls (1a, 1b),
- on réalise à intervalles réguliers une ligne de soudure transversale (L2) constituant un fond (le),  a transverse welding line (L2) constituting a bottom (1c) is produced at regular intervals,
- on réalise à intervalles réguliers une ligne de soudure oblique (L3) entre les bords externes des soufflets (le, ld) et la ligne de soudure transversale (L2) constituant le fond (le),  an oblique weld line (L3) is produced at regular intervals between the external edges of the bellows (1a, 1d) and the transverse weld line (L2) constituting the bottom (1c),
- on découpe une zone triangulaire résultant des lignes de soudures obliques (L3) et de fond (le),  a triangular zone resulting from the lines of oblique (L3) and bottom (1) welds is cut off,
- on réalise une coupe au niveau du fond (le) présentant symétriquement, de part et d'autre, les lignes obliques, pour former une ouverture du sac.  - A cut is made at the bottom (the) having symmetrically, on either side, the oblique lines, to form an opening of the bag.
-2- Procédé selon la revendication 1 , caractérisé en ce que la découpe des zones triangulaires est conformée de manière à réaliser des bords arrondis. -3- Procédé selon l'une des revendications précédentes, caractérisé en ce que la découpe de chaque zone triangulaire est effectuée à partir du bord externe des soufflets (le, ld), en longeant le bord externe de la ligne de soudure oblique (L3), jusqu'au bord externe de la ligne de soudure transversale (L2), puis la découpe est poursuivie transversalement vers l'intérieur de la gaine de film plastique en longeant le bord externe de la ligne de soudure transversale (L2) jusqu'à faire un demi-cercle en s 'éloignant de la ligne de soudure transversale (L2) pour revenir en arrière et poursuivre la découpe transversalement jusqu'au bord externe de la gaine, parallèlement à la ligne de soudure transversale (L2). -2- Method according to claim 1, characterized in that the cutting of the triangular areas is shaped so as to achieve rounded edges. -3- Method according to one of the preceding claims, characterized in that the cutting of each triangular zone is made from the outer edge of the bellows (le, ld), along the outer edge of the oblique welding line (L3 ), to the outer edge of the transverse weld line (L2), then the cut is continued transversely to the inside of the plastic film sheath along the outer edge of the transverse weld line (L2) to a semicircle away from the transverse weld line (L2) to go back and continue cutting transversely to the outer edge of the sheath, parallel to the transverse welding line (L2).
-4- Procédé selon la revendication 3, caractérisé en ce que la découpe au niveau du fond (le) est réalisée avec une double lame, dont l'écartement des deux lames est tel que lors de la double découpe, les découpes transversales réalisées lors de la découpe des zones triangulaires se retrouvent agencées entre lesdites deux lames. -4- A method according to claim 3, characterized in that the cut at the bottom (the) is formed with a double blade, the spacing of the two blades is such that during the double cutting, the transverse cuts made during triangular areas are cut out arranged between said two blades.
EP16717424.2A 2015-03-31 2016-03-24 Method for continuously manufacturing a plastic bag for food products Active EP3277596B1 (en)

Priority Applications (1)

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PL16717424T PL3277596T3 (en) 2015-03-31 2016-03-24 Method for continuously manufacturing a plastic bag for food products

Applications Claiming Priority (2)

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FR1552713A FR3034406B1 (en) 2015-03-31 2015-03-31 PROCESS FOR THE CONTINUOUS PRODUCTION OF A BAG OF PLASTIC MATERIAL
PCT/FR2016/050669 WO2016156712A1 (en) 2015-03-31 2016-03-24 Method for continuously manufacturing a plastic bag for food products

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EP3277596B1 EP3277596B1 (en) 2018-11-21

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DK (1) DK3277596T3 (en)
ES (1) ES2701953T3 (en)
FR (1) FR3034406B1 (en)
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PT (1) PT3277596T (en)
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CN110857164B (en) * 2018-08-22 2021-07-06 东莞市新力邦机械有限公司 Manufacturing equipment for square bags

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Publication number Priority date Publication date Assignee Title
US3119548A (en) * 1961-06-08 1964-01-28 Dale Products Plastics Ltd Plastic bags
DE1786047A1 (en) * 1968-08-10 1971-11-11 Neemann Mechanische Papierware Foil pouch made of a composite film
US4789350A (en) * 1986-04-19 1988-12-06 Honsel Karl Heinz Method and apparatus for manufacturing mailing envelopes or bags
FR2672033A1 (en) * 1991-01-25 1992-07-31 Bottari Pierre Polygonal bag with planar transverse wall and device for its implementation
JP3845163B2 (en) * 1997-01-28 2006-11-15 株式会社フジシールインターナショナル Equipment for producing containers with spouts
JPH1143155A (en) * 1997-07-23 1999-02-16 Hosokawa Yoko Co Ltd Liquid container
JPH11222244A (en) * 1998-02-02 1999-08-17 Hosokawa Yoko:Kk Pharmaceutical and medical gusset bag
US6561963B2 (en) * 1999-12-02 2003-05-13 Totani Corporation Plastic bag making apparatus
FR2833928B1 (en) 2001-12-26 2004-02-13 Autobar Flexible France PACKAGING BAG WITH PREFORMED FONF

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DK3277596T3 (en) 2019-01-02
PT3277596T (en) 2018-11-30
EP3277596B1 (en) 2018-11-21
WO2016156712A1 (en) 2016-10-06
TR201819432T4 (en) 2019-01-21
FR3034406B1 (en) 2017-12-08
PL3277596T3 (en) 2019-04-30
FR3034406A1 (en) 2016-10-07

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