EP4190546A1 - Bag for packaging food and fat-resistant products, and method for manufacturing such a bag - Google Patents

Bag for packaging food and fat-resistant products, and method for manufacturing such a bag Download PDF

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Publication number
EP4190546A1
EP4190546A1 EP22208713.2A EP22208713A EP4190546A1 EP 4190546 A1 EP4190546 A1 EP 4190546A1 EP 22208713 A EP22208713 A EP 22208713A EP 4190546 A1 EP4190546 A1 EP 4190546A1
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EP
European Patent Office
Prior art keywords
bag
edges
film
food products
wall
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.)
Pending
Application number
EP22208713.2A
Other languages
German (de)
French (fr)
Inventor
Eric Valette
Sébastien MAUNY
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
Publication of EP4190546A1 publication Critical patent/EP4190546A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/008—Stiffening or reinforcing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • 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
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • 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
    • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
    • 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
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • 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

Definitions

  • the present invention relates to the technical field of packaging bags made from paper, in particular for the packaging of food products.
  • the invention relates to a greaseproof food packaging bag and a method of making such a bag.
  • a bag for packaging food products comprising a front wall and a rear wall, connected by gussets, a bottom, and a filling opening, the bag is made from a film with a thickness of less than 200 ⁇ m, subjected to successive folding, welding and cutting operations to continuously form the packaging bag.
  • bags can be used to pack food for humans or for animals.
  • the bag Depending on the food products being packaged, there is a need to make the bag resistant to grease that may be imparted by the products. In particular, the bag must be able to withstand at least the shelf life of the packaged food products.
  • these preformed bags are made, continuously, from a single plastic film, such as PE with or without added PP, or PE with added PET, or any other material perfectly known to a person skilled in the art. profession, employed in the field of food packaging, in particular.
  • Fats from food products find themselves in contact with the bottom of the bag, soaking the bottom of the paper bag which loses, in addition to its general aesthetics, its mechanical resistance capacities.
  • the bottom of the bag becomes greasy, which also poses storage problems for said bag.
  • One solution for solving this problem consists in coating the edges of the film intended to be in contact with the food products with a barrier glue or with a wax.
  • the method requires the addition of an additional element, such as wax, and is therefore not economical, nor exempt from any risk of grease penetrating into the paper.
  • the slices of the transverse cut edges are difficult to process. There is, to date, no industrial means to carry out this operation easily on the transverse edges.
  • One of the aims of the invention is therefore to propose a method of manufacturing a packaging bag made at least from paper which is resistant to fats rendered by packaged products, at least during their shelf life.
  • resistant is meant that the grease does not soak the paper so that its general aesthetics is not degraded and that it retains its mechanical resistance capacities.
  • a method for manufacturing a bag for packaging food products comprising a front wall and a rear wall, connected by gussets, a bottom, and a filling opening, the bag being manufactured from at least one film made from paper treated to act as a grease barrier at the level of an internal face of the bag.
  • the film is for example a paper/plastic complex, with the paper on the outside of the bag and the plastic on the inside.
  • the film can be multi-ply, the plies of which can be glued together partially or completely.
  • the barrier treatment can be a layer of polypropylene, cellulose, polyester, polyethylene, polyactic acid, or any other layer or coating known for its grease barrier properties.
  • the film is subjected to successive folding, gluing and cutting operations to continuously form the packaging bag.
  • the method according to the invention is remarkable in that, at the bottom of the bag, the edges of the film intended to be in contact with the food products are folded over on themselves and towards the outside of the bag to avoid any contact of said edges with the food products when inserted into the bag.
  • the bottom of the bag is a flat bottom, well known in the state of the art.
  • edges of the side walls and of the first transverse wall of the bottom can be folded on themselves before or after the folding of said walls.
  • edges of the side walls and of the first transverse wall of the bottom are folded on themselves and towards the outside, at the same time as the folding of said walls .
  • the method is remarkable in that, before folding said side walls of the bottom, cutouts are made so as to separate the side walls from the transverse walls of said bottom. .
  • the invention also relates to a bag for packaging food products which is resistant to the fats resulting from said food products.
  • the packaging bag is made from paper treated to act as a barrier to grease at the level of an internal face of the bag, and comprises at least a front wall and a rear wall, connected by gussets, a bottom, and a filling opening.
  • the film comprises, at the bottom, edges intended to be in contact with the food products which are folded over on themselves and towards the outside of the bag to avoid any contact of said edges with the food products when 'they are inserted into the bag.
  • the bottom of the bag is a flat bottom.
  • the invention relates to a method of manufacturing a bag for packaging food products, produced from a film (1) comprising paper treated to form a barrier to grease at the level of an internal face of the bag, subjected to successive folding, gluing and cutting operations to continuously form the packaging bag.
  • the film (1) is for example a paper/plastic complex, with the paper on the outer face of the bag and the plastic on the inner face.
  • the film can be multi-ply, the plies of which can be glued together partially or completely.
  • the barrier treatment can be a layer of polypropylene, cellulose, polyester, polyethylene, polyactic acid, or any other layer or coating known for its grease barrier properties.
  • the quantity of plastic or more generally of material conferring the role of barrier to fats associated with paper is low so as not to hinder the recyclability of the bag.
  • the bag is manufactured continuously from a strip of film (1) shaped, by means of folding plates for example, to form a sheath (3) defining a front wall (3a) and a rear wall ( 3b) connected by bellows (3c).
  • the sheath (3) is then cut transversely according to the length of the bag to be manufactured, see figure 2 .
  • the bag preferably has a flat bottom (4) also called a square bottom or cross bottom, formed by carrying out a first step consisting in folding a transverse end of the front wall (3a) on the outside, so as to open the gussets (3c) and to position them flat forming a triangle, see picture 3 .
  • a second step then consists in closing and gluing the flat bottom (4) by folding inwardly and successively the side walls (4a) of the bottom, see figure 4 , a first transverse wall (4b) of the bottom, see figure 5 , and a second transverse wall (4c) of the bottom, overlapping on the first transverse wall (4b), see figure 6 , to close the background.
  • the edges (4a1, 4b1) of the film intended to be in contact with the food products are folded over on themselves and towards the outside of the bag to avoid any contact of the said edges with food products intended to be inserted into the bag.
  • edges (4a1) of the side walls (4a) and the edge (4b1) of the first transverse wall (4b) are folded on themselves and outwards, by means of bending plate or mechanical ski for example, and preferably at the same time as the folding of said walls (4a, 4b). It is also possible to make a pre-fold of the edge (4b1) of the first transverse wall (4b) at the stage when the bag is in the form of a sheath, see figure 2 . A pre-fold of the cut transverse edges can be made at this point in the process.
  • cutouts (5, 6) are made so as to separate the side walls (4a) from the transverse walls (4b, 4c).
  • the cutouts (6) made on the side of the second transverse wall (4c) which overlap close the bottom are wider than the cutouts (5) made on the side of the first transverse wall (4b) to allow to have a width of the second transverse wall (4c) greater than that of the first transverse wall (4b), and therefore allow the overlap.
  • edges (4a1, 4b1) folded on themselves therefore offer mechanical protection so that the edges of the film (1) are not in direct contact with the fats released by the packaged food, so as to delay or even prevent the penetration by capillary action of the grease in the paper constituting the film (1).
  • the invention then provides a packaging bag for food products made from paper treated to form a barrier to grease at the level of an internal face of the bag, and comprising at least a front wall (3a) and a rear wall (3b ), connected by bellows (3c), a bottom (4), for example flat, and a filling opening, and whose edges (4a1, 4b1) located at the bottom of the bag and which are intended to be in contact with the food products, are folded on themselves and towards the outside of the bag to avoid any contact of said edges with the food products intended to be inserted into the bag.

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

Abstract

L'invention concerne un de fabrication d'un sac d'emballage de produits alimentaires comprenant une paroi avant (3a) et une paroi arrière (3b), reliées par des soufflets, un fond, et une ouverture de remplissage, le sac est fabriqué à partir d'au moins un film (1) réalisé à partir de papier traité pour faire barrière aux graisses au niveau d'une face interne du sac , soumis à des opérations successives de pliage, de collage et de coupe pour former en continu le sac d'emballage.Selon l'invention, au niveau du fond (4) du sac, des bords (4a1, 4b1) du film destinés à être en contact avec les produits alimentaires sont repliés sur eux-mêmes et vers l'extérieur du sac pour éviter tout contact desdits bords avec les produits alimentaires destinés à être insérés dans le sac.The invention relates to a method of manufacturing a food packaging bag comprising a front wall (3a) and a rear wall (3b), connected by gussets, a bottom, and a filling opening, the bag is manufactured from at least one film (1) made from paper treated to act as a barrier to grease at the level of an internal face of the bag, subjected to successive operations of folding, gluing and cutting to continuously form the packaging bag. According to the invention, at the bottom (4) of the bag, the edges (4a1, 4b1) of the film intended to be in contact with the food products are folded over on themselves and towards the outside of the bag to avoid any contact of said edges with the food products intended to be inserted into the bag.

Description

Domaine techniqueTechnical area

La présente invention se rapporte au domaine technique des sacs d'emballage réalisés à partir de papier, en particulier pour l'emballage de produits alimentaires.The present invention relates to the technical field of packaging bags made from paper, in particular for the packaging of food products.

Plus particulièrement, l'invention concerne un sac d'emballage de produits alimentaires étanche aux graisses et un procédé de fabrication d'un tel sac.More particularly, the invention relates to a greaseproof food packaging bag and a method of making such a bag.

Art antérieurPrior art

Il est connu de l'état de la technique un sac d'emballage de produits alimentaires comprenant une paroi avant et une paroi arrière, reliées par des soufflets, un fond, et une ouverture de remplissage, le sac est fabriqué à partir d'un film d'épaisseur inférieure à 200 µm, soumis à des opérations successives de pliage, de soudure et de coupe pour former en continu le sac d'emballage.It is known from the state of the art a bag for packaging food products comprising a front wall and a rear wall, connected by gussets, a bottom, and a filling opening, the bag is made from a film with a thickness of less than 200 µm, subjected to successive folding, welding and cutting operations to continuously form the packaging bag.

Ces types de sacs peuvent être utilisés pour emballer de la nourriture pour les humains ou pour les animaux.These types of bags can be used to pack food for humans or for animals.

En fonction des produits alimentaires emballés, il existe un besoin de rendre le sac résistant aux graisses pouvant être rendues par les produits. En particulier, le sac doit pouvoir résister au minimum pendant la durée de conservation des produits alimentaires emballés.Depending on the food products being packaged, there is a need to make the bag resistant to grease that may be imparted by the products. In particular, the bag must be able to withstand at least the shelf life of the packaged food products.

Généralement, ces sacs préformés sont réalisés, en continu, à partir d'un seul film en matière plastique, tels que du PE additionné ou non de PP, ou bien du PE additionné de PET, ou toutes autres matières parfaitement connues pour un homme du métier, employées dans le domaine de l'emballage alimentaire, notamment.Generally, these preformed bags are made, continuously, from a single plastic film, such as PE with or without added PP, or PE with added PET, or any other material perfectly known to a person skilled in the art. profession, employed in the field of food packaging, in particular.

Pour des raisons écologiques, la conjoncture tend toutefois à favoriser le sac réalisé en papier.For ecological reasons, however, the economic situation tends to favor the bag made of paper.

L'un des problèmes généralement constatés se retrouve dans les sacs d'emballages de produits alimentaires, que ce soit de produits pour l'alimentation humaine (chips, cacahuètes, etc.) ou de produits pour l'alimentation animale (croquettes).One of the problems generally observed is found in the packaging bags of food products, whether they are food products human (crisps, peanuts, etc.) or products for animal feed (kibbles).

Les graisses issues des produits alimentaires se retrouvent contact du fond du sac, imbibent le fond du sac en papier qui perd, outre son esthétique générale, ses capacités de résistances mécaniques.Fats from food products find themselves in contact with the bottom of the bag, soaking the bottom of the paper bag which loses, in addition to its general aesthetics, its mechanical resistance capacities.

Le fond du sac devient graisseux, ce qui posent également des problèmes de stockage dudit sac.The bottom of the bag becomes greasy, which also poses storage problems for said bag.

Pour remédier ce problème, il est connu de traiter le film constituant le sac, notamment lors de sa fabrication, avec des substances per- et polyfluoroalkylées (PFAS)qui font barrières aux graisses.To remedy this problem, it is known to treat the film constituting the bag, in particular during its manufacture, with per- and polyfluoroalkylated substances (PFAS) which form barriers to grease.

Cependant, cette substance fluorée voit son utilisation progressivement interdite.However, this fluorinated substance sees its use progressively prohibited.

Il est également connu d'utiliser un sac réalisé à partir d'un complexe papier et polyéthylène ou polypropylène en couche interne pour rendre étanche ledit sac.It is also known to use a bag made from a paper and polyethylene or polypropylene complex in the inner layer to seal said bag.

Cependant, le même problème se pose au niveau des tranches du film constituant le sac qui laisse pénétrer les graisses par capillarité, et imbiber la couche papier du sac, ce qui pose les mêmes problèmes que précités.However, the same problem arises at the edges of the film constituting the bag which allows the fats to penetrate by capillarity, and soak the paper layer of the bag, which poses the same problems as mentioned above.

Une solution pour résoudre ce problème consiste à enduire les tranches du film destinées à être en contact avec les produits alimentaires d'une colle barrière ou d'une cire.One solution for solving this problem consists in coating the edges of the film intended to be in contact with the food products with a barrier glue or with a wax.

Cependant, le procédé nécessite l'ajout d'un élément supplémentaire, tel que de la cire, et n'est donc pas économique, ni exempt de tout risque de pénétration des graisses dans le papier. En outre, les tranches des bords de coupe transversaux sont difficiles à traiter. Il n'existe, à ce jour, aucun moyen industriel pour réaliser cette opération de manière aisée sur les bords transversaux.However, the method requires the addition of an additional element, such as wax, and is therefore not economical, nor exempt from any risk of grease penetrating into the paper. In addition, the slices of the transverse cut edges are difficult to process. There is, to date, no industrial means to carry out this operation easily on the transverse edges.

Il est également connu les documents US8282539 , US6533457 et US4175478 qui décrivent le préambule de la revendication 1.It is also known the documents US8282539 , US6533457 And US4175478 which describe the preamble of claim 1.

Exposé de l'inventionDisclosure of Invention

L'un des buts de l'invention est donc de proposer un procédé de fabrication d'un sac d'emballage réalisé au moins à partir de papier qui soit résistant aux graisses rendues par les produits emballés, au moins pendant leur durée de conservation.One of the aims of the invention is therefore to propose a method of manufacturing a packaging bag made at least from paper which is resistant to fats rendered by packaged products, at least during their shelf life.

Par résistant on entend que la graisse ne vient pas imbiber le papier de sorte que son esthétique générale n'est pas dégradée et qu'il conserve ses capacités de résistance mécanique.By resistant is meant that the grease does not soak the paper so that its general aesthetics is not degraded and that it retains its mechanical resistance capacities.

À cet effet, il a été mis au point un procédé de fabrication d'un sac d'emballage de produits alimentaires comprenant une paroi avant et une paroi arrière, reliées par des soufflets, un fond, et une ouverture de remplissage, le sac étant fabriqué à partir d'au moins un film réalisé à partir de papier traité pour faire barrière aux graisses au niveau d'une face interne du sac. Le film est par exemple un complexe papier/plastique, avec le papier en face externe du sac et le plastique en face interne. Le film peut être multi-plis, dont les plis peuvent être adhésivés ensemble partiellement ou complètement. Le traitement barrière peut être une couche en polypropylène, cellulose, polyester, polyéthylène, acide polyactique, ou tout autre couche ou revêtement connu pour ses propriétés barrières aux graisses.To this end, a method has been developed for manufacturing a bag for packaging food products comprising a front wall and a rear wall, connected by gussets, a bottom, and a filling opening, the bag being manufactured from at least one film made from paper treated to act as a grease barrier at the level of an internal face of the bag. The film is for example a paper/plastic complex, with the paper on the outside of the bag and the plastic on the inside. The film can be multi-ply, the plies of which can be glued together partially or completely. The barrier treatment can be a layer of polypropylene, cellulose, polyester, polyethylene, polyactic acid, or any other layer or coating known for its grease barrier properties.

D'une manière connue, le film est soumis à des opérations successives de pliage, de collage et de coupe pour former en continu le sac d'emballage.In a known manner, the film is subjected to successive folding, gluing and cutting operations to continuously form the packaging bag.

Le procédé selon l'invention est remarquable en ce que, au niveau du fond du sac, des bords du film destinés à être en contact avec les produits alimentaires sont repliés sur eux-mêmes et vers l'extérieur du sac pour éviter tout contact desdits bords avec les produits alimentaires lorsqu'ils sont insérés dans le sac.The method according to the invention is remarkable in that, at the bottom of the bag, the edges of the film intended to be in contact with the food products are folded over on themselves and towards the outside of the bag to avoid any contact of said edges with the food products when inserted into the bag.

De cette manière, les tranches du film n'étant pas en contact direct avec les produits alimentaires, les risques que le papier au niveau du fond du sac se retrouve imbibé de graisse sont réduits, voire évités.In this way, the edges of the film not being in direct contact with the food products, the risks of the paper at the bottom of the bag being soaked in grease are reduced, or even avoided.

Il s'ensuit que l'esthétique générale du sac, ainsi que ses propriétés de résistances mécaniques sont conservées, tout en ayant un sac qui soit de conception simple, économique et écologique.It follows that the general aesthetics of the bag, as well as its mechanical resistance properties are preserved, while having a bag which is of simple, economical and ecological design.

Selon une forme de réalisation particulière, le fond du sac est un fond plat, bien connu de l'état de la technique.According to a particular embodiment, the bottom of the bag is a flat bottom, well known in the state of the art.

A cet effet, le procédé selon l'invention est remarquable en ce qu'il consiste, à partir d'un film plié et collé pour former une gaine définissant la paroi avant, les soufflets et la paroi arrière du sac, à former le fond plat en :

  • rabattant extérieurement une extrémité transversale de la paroi avant, de manière à ouvrir les soufflets et à les positionner à plat en formant un triangle ;
  • fermant le fond en repliant intérieurement successivement des parois latérales du fond, une première paroi transversale du fond, et une deuxième paroi transversale du fond en chevauchement sur la première paroi ;
les bords des parois latérales et de la première paroi transversale étant repliés sur eux-mêmes et vers l'extérieur pour éviter le contact direct avec les produits alimentaires et obtenir les avantages précités de l'invention.To this end, the method according to the invention is remarkable in that it consists, from a film folded and glued to form a sheath defining the front wall, the gussets and the rear wall of the bag, to form the flat bottom by:
  • externally folding down a transverse end of the front wall, so as to open the bellows and position them flat, forming a triangle;
  • closing the bottom by successively folding inwardly the side walls of the bottom, a first transverse wall of the bottom, and a second transverse wall of the bottom overlapping the first wall;
the edges of the side walls and of the first transverse wall being folded on themselves and outwards to avoid direct contact with the food products and to obtain the aforementioned advantages of the invention.

Les bords des parois latérales et de la première paroi transversale du fond peuvent être repliés sur eux-mêmes avant ou après le repliage desdites parois.The edges of the side walls and of the first transverse wall of the bottom can be folded on themselves before or after the folding of said walls.

De préférence, et pour avoir un procédé fluide, et sans temps d'arrêt, les bords des parois latérales et de la première paroi transversale du fond sont repliés sur eux-mêmes et vers l'extérieur, en même temps que le repliage desdites parois.Preferably, and to have a fluid process, and without downtime, the edges of the side walls and of the first transverse wall of the bottom are folded on themselves and towards the outside, at the same time as the folding of said walls .

Pour faciliter le repliage des bords des parois latérales et de la première paroi transversale du fond, le procédé est remarquable en ce que, avant repliage desdites parois latérale du fond, des découpes sont réalisées de manière à séparer les parois latérales des parois transversales dudit fond.To facilitate the folding of the edges of the side walls and of the first transverse wall of the bottom, the method is remarkable in that, before folding said side walls of the bottom, cutouts are made so as to separate the side walls from the transverse walls of said bottom. .

L'invention concerne également un sac d'emballage de produits alimentaires résistant aux graisses issues desdits produits alimentaires.The invention also relates to a bag for packaging food products which is resistant to the fats resulting from said food products.

D'une manière connue, le sac d'emballage est réalisé à partir de papier traité pour faire barrière aux graisses au niveau d'une face interne du sac, et comprend au moins une paroi avant et une paroi arrière, reliées par des soufflets, un fond, et une ouverture de remplissage.In a known way, the packaging bag is made from paper treated to act as a barrier to grease at the level of an internal face of the bag, and comprises at least a front wall and a rear wall, connected by gussets, a bottom, and a filling opening.

Selon l'invention, le film comprend, au niveau du fond, des bords destinés à être en contact avec les produits alimentaires qui sont repliés sur eux-mêmes et vers l'extérieur du sac pour éviter tout contact desdits bords avec les produits alimentaires lorsqu'ils sont insérés dans le sac.According to the invention, the film comprises, at the bottom, edges intended to be in contact with the food products which are folded over on themselves and towards the outside of the bag to avoid any contact of said edges with the food products when 'they are inserted into the bag.

Selon une forme de réalisation particulière, le fond du sac est un fond plat.According to a particular embodiment, the bottom of the bag is a flat bottom.

Brève description des dessinsBrief description of the drawings

D'autres avantages et caractéristiques ressortiront mieux de la description qui va suivre, donnée à titre d'exemple non limitatif du sac d'emballage et de son procédé de fabrication selon l'invention, à partir des dessins annexés dans lesquels :

  • [Fig. 1] est une vue illustrant le déroulage d'un film présentant des lignes de pliage pour les soufflets.
  • [Fig. 2] illustre le film replié en gaine avec formation des soufflets, et avant découpe transversale au niveau du fond du sac.
  • [Fig. 3] illustre la gaine coupée transversalement, avec l'extrémité transversale de la paroi avant rabattue extérieurement, de manière à ouvrir les soufflets et à les positionner à plat en formant un triangle.
  • [Fig. 4] illustre le repliage vers l'intérieur des parois latérales du fond, les bords des parois latérales étant repliés sur eux-mêmes et vers l'extérieur.
  • [Fig. 5] illustre le repliage de la première paroi transversale du fond, le bord de la première paroi transversale étant replié sur lui-même et vers l'extérieur.
  • [Fig. 6] illustre le repliage de la deuxième paroi transversale du fond pour fermer et former le fond plat du sac.
Other advantages and characteristics will emerge better from the description which follows, given by way of non-limiting example of the packaging bag and its method of manufacture according to the invention, from the appended drawings in which:
  • [ Fig. 1 ] is a view illustrating the unwinding of a film showing fold lines for the bellows.
  • [ Fig. 2 ] illustrates the film folded into a sheath with formation of the gussets, and before transverse cutting at the bottom of the bag.
  • [ Fig. 3 ] illustrates the sheath cut transversely, with the transverse end of the front wall folded down on the outside, so as to open the bellows and position them flat in the form of a triangle.
  • [ Fig. 4 ] illustrates the inward folding of the side walls of the bottom, the edges of the side walls being folded in on themselves and outwards.
  • [ Fig. 5 ] illustrates the folding of the first transverse wall of the bottom, the edge of the first transverse wall being folded on itself and outwards.
  • [ Fig. 6 ] illustrates the folding of the second transverse wall of the bottom to close and form the flat bottom of the bag.

Description détaillée de l'inventionDetailed description of the invention

En référence aux figures 1 à 6, l'invention concerne un procédé de fabrication d'un sac d'emballage de produits alimentaires, réalisé à partir d'un film (1) comprenant du papier traité pour faire barrière aux graisses au niveau d'une face interne du sac, soumis à des opérations successives de pliage, de collage et de coupe pour former en continu le sac d'emballage. De manière connue, le film (1) est par exemple un complexe papier/plastique, avec le papier en face externe du sac et le plastique en face interne. Le film peut être multi-plis, dont les plis peuvent être adhésivés ensemble partiellement ou complètement. Le traitement barrière peut être une couche en polypropylène, cellulose, polyester, polyéthylène, acide polyactique, ou tout autre couche ou revêtement connu pour ses propriétés barrières aux graisses.With reference to figures 1 to 6 , the invention relates to a method of manufacturing a bag for packaging food products, produced from a film (1) comprising paper treated to form a barrier to grease at the level of an internal face of the bag, subjected to successive folding, gluing and cutting operations to continuously form the packaging bag. In known manner, the film (1) is for example a paper/plastic complex, with the paper on the outer face of the bag and the plastic on the inner face. The film can be multi-ply, the plies of which can be glued together partially or completely. The barrier treatment can be a layer of polypropylene, cellulose, polyester, polyethylene, polyactic acid, or any other layer or coating known for its grease barrier properties.

D'une manière connue, la quantité de plastique ou plus généralement de matière conférant le rôle de barrière aux graisses associée au papier est faible de sorte à ne pas entraver la recyclabilité du sac.In a known way, the quantity of plastic or more generally of material conferring the role of barrier to fats associated with paper is low so as not to hinder the recyclability of the bag.

Selon une première forme de réalisation du procédé illustré aux figures 1 à 6, le sac est fabriqué en continu à partir d'une bande de film (1) conformée, par l'intermédiaire de tôles de pliage par exemple, pour former une gaine (3) définissant une paroi avant (3a) et une paroi arrière (3b) reliées par des soufflets (3c).According to a first embodiment of the method illustrated in figures 1 to 6 , the bag is manufactured continuously from a strip of film (1) shaped, by means of folding plates for example, to form a sheath (3) defining a front wall (3a) and a rear wall ( 3b) connected by bellows (3c).

La gaine (3) est ensuite découpée transversalement selon la longueur du sac à fabriquer, voir figure 2.The sheath (3) is then cut transversely according to the length of the bag to be manufactured, see figure 2 .

Le sac présente de préférence un fond plat (4) également appelé fond carré ou fond croisé, formé en réalisant une première étape consistant à rabattre extérieurement une extrémité transversale de la paroi avant (3a), de manière à ouvrir les soufflets (3c) et à les positionner à plat en formant un triangle, voir figure 3.The bag preferably has a flat bottom (4) also called a square bottom or cross bottom, formed by carrying out a first step consisting in folding a transverse end of the front wall (3a) on the outside, so as to open the gussets (3c) and to position them flat forming a triangle, see picture 3 .

Une deuxième étape consiste ensuite à fermer et coller le fond plat (4) en repliant intérieurement et successivement des parois latérales (4a) du fond, voir figure 4, une première paroi transversale (4b) du fond, voir figure 5, et une deuxième paroi transversale (4c) du fond, en chevauchement sur la première paroi transversale (4b), voir figure 6, pour fermer le fond.A second step then consists in closing and gluing the flat bottom (4) by folding inwardly and successively the side walls (4a) of the bottom, see figure 4 , a first transverse wall (4b) of the bottom, see figure 5 , and a second transverse wall (4c) of the bottom, overlapping on the first transverse wall (4b), see figure 6 , to close the background.

Selon l'invention, au niveau du fond du sac, des bords (4a1, 4b1) du film destinés à être en contact avec les produits alimentaires sont repliés sur eux-mêmes et vers l'extérieur du sac pour éviter tout contact desdits bords avec les produits alimentaires destinés à être insérés dans le sac.According to the invention, at the level of the bottom of the bag, the edges (4a1, 4b1) of the film intended to be in contact with the food products are folded over on themselves and towards the outside of the bag to avoid any contact of the said edges with food products intended to be inserted into the bag.

En particulier, les bords (4a1) des parois latérales (4a) et le bord (4b1) de la première paroi transversale (4b) sont repliés sur eux-mêmes et vers l'extérieur, par l'intermédiaire de tôle de pliage ou de ski mécanique par exemple, et de préférence en même temps que le repliage desdites parois (4a, 4b). Il est également envisageable de réaliser un pré-pli de du bord (4b1) de la première paroi transversale (4b) au stade où le sac est en forme de gaine, voir figure 2. Un pré-pli des bords transversaux découpés peut être réalisé à ce moment du procédé.In particular, the edges (4a1) of the side walls (4a) and the edge (4b1) of the first transverse wall (4b) are folded on themselves and outwards, by means of bending plate or mechanical ski for example, and preferably at the same time as the folding of said walls (4a, 4b). It is also possible to make a pre-fold of the edge (4b1) of the first transverse wall (4b) at the stage when the bag is in the form of a sheath, see figure 2 . A pre-fold of the cut transverse edges can be made at this point in the process.

Pour faciliter le repliage des bords (4a1, 4b1) sur eux-mêmes, des découpes (5, 6) sont réalisées de manière à séparer les parois latérales (4a) des parois transversales (4b, 4c). Les découpes (6) réalisées du côté de la deuxième paroi transversale (4c) qui vient en chevauchement fermer le fond sont plus larges que les découpes (5) réalisées du côté de la première paroi transversale (4b) pour permettre d'avoir une largeur de la deuxième paroi transversale (4c) plus grande que celle de la première paroi transversale (4b), et donc permettre le chevauchement.To facilitate the folding of the edges (4a1, 4b1) on themselves, cutouts (5, 6) are made so as to separate the side walls (4a) from the transverse walls (4b, 4c). The cutouts (6) made on the side of the second transverse wall (4c) which overlap close the bottom are wider than the cutouts (5) made on the side of the first transverse wall (4b) to allow to have a width of the second transverse wall (4c) greater than that of the first transverse wall (4b), and therefore allow the overlap.

Les bords (4a1, 4b1) repliés sur eux-mêmes offre donc une protection mécanique pour que les bords du film (1) ne soient pas en contact direct avec les graisses rendues par les aliments emballés, de sorte à retarder, voire éviter la pénétration par capillarité de la graisse dans le papier constituant le film (1).The edges (4a1, 4b1) folded on themselves therefore offer mechanical protection so that the edges of the film (1) are not in direct contact with the fats released by the packaged food, so as to delay or even prevent the penetration by capillary action of the grease in the paper constituting the film (1).

L'invention fournit alors un sac d'emballage de produits alimentaires réalisé à partir de papier traité pour faire barrière aux graisses au niveau d'une face interne du sac, et comprenant au moins une paroi avant (3a) et une paroi arrière (3b), reliées par des soufflets (3c), un fond (4), par exemple plat, et une ouverture de remplissage, et dont les bords (4a1, 4b1) situés au fond du sac et qui sont destinés à être en contact avec les produits alimentaires, sont repliés sur eux-mêmes et vers l'extérieur du sac pour éviter tout contact desdits bords avec les produits alimentaires destinés à être insérés dans le sac.The invention then provides a packaging bag for food products made from paper treated to form a barrier to grease at the level of an internal face of the bag, and comprising at least a front wall (3a) and a rear wall (3b ), connected by bellows (3c), a bottom (4), for example flat, and a filling opening, and whose edges (4a1, 4b1) located at the bottom of the bag and which are intended to be in contact with the food products, are folded on themselves and towards the outside of the bag to avoid any contact of said edges with the food products intended to be inserted into the bag.

Claims (6)

Procédé de fabrication d'un sac d'emballage de produits alimentaires comprenant une paroi avant (3a) et une paroi arrière (3b), reliées par des soufflets, un fond, et une ouverture de remplissage, le sac est fabriqué à partir d'au moins un film (1) réalisé à partir de papier traité pour faire barrière aux graisses au niveau d'une face interne du sac, soumis à des opérations successives de pliage, de collage et de coupe pour former en continu le sac d'emballage, caractérisé en ce que, au niveau du fond (4) du sac, des bords (4a1, 4b1) du film destinés à être en contact avec les produits alimentaires sont repliés sur eux-mêmes et vers l'extérieur du sac pour éviter tout contact desdits bords avec les produits alimentaires destinés à être insérés dans le sac.A method of making a food packaging bag comprising a front wall (3a) and a back wall (3b), connected by gussets, a bottom, and a filling opening, the bag is made from at least one film (1) made from paper treated to act as a grease barrier on an internal face of the bag, subjected to successive folding, gluing and cutting operations to continuously form the packaging bag , characterized in that , at the level of the bottom (4) of the bag, the edges (4a1, 4b1) of the film intended to be in contact with the food products are folded over on themselves and towards the outside of the bag to avoid any contact of said edges with the food products intended to be inserted into the bag. Procédé selon la revendication 1, caractérisé en ce que le procédé consiste, à partir d'un film (1) plié et collé pour former une gaine (3) définissant la paroi avant (3a), les soufflets (3c) et la paroi arrière (3b), à former un fond plat (4) en : - rabattant extérieurement une extrémité transversale de la paroi avant (3a), de manière à ouvrir les soufflets (3c) et à les positionner à plat en formant un triangle ; - fermant le fond (4) en repliant intérieurement successivement des parois latérales (4a) du fond, une première paroi transversale (4b) du fond, et une deuxième paroi transversale (4c) du fond, en chevauchement sur la première paroi transversale (4b) ; les bords (4a1) des parois latérales (4a) et le bord (4b1) de la première paroi transversale (4b) étant repliés sur eux-mêmes et vers l'extérieur.Method according to claim 1, characterized in that the method consists, from a film (1) folded and glued to form a sheath (3) defining the front wall (3a), the bellows (3c) and the rear wall (3b), to form a flat bottom (4) by: - Outwardly folding a transverse end of the front wall (3a), so as to open the bellows (3c) and position them flat forming a triangle; - closing the bottom (4) by successively folding inwardly side walls (4a) of the bottom, a first transverse wall (4b) of the bottom, and a second transverse wall (4c) of the bottom, overlapping on the first transverse wall (4b ); the edges (4a1) of the side walls (4a) and the edge (4b1) of the first transverse wall (4b) being folded back on themselves and outwards. Procédé selon la revendication 1, caractérisé en ce que les bords (4a1) des parois latérales (4a) et le bord (4b1) de la première paroi transversale (4b) sont repliés sur eux-mêmes et vers l'extérieur, en même temps que le repliage desdites parois (4a, 4b).Method according to Claim 1, characterized in that the edges (4a1) of the side walls (4a) and the edge (4b1) of the first transverse wall (4b) are folded over on themselves and outwards, at the same time as the folding of said walls (4a, 4b). Procédé selon la revendication 1, caractérisé en ce que, avant repliage des parois latérales (4a) du fond, des découpes (5, 6) sont réalisées de manière à séparer les parois latérales (4a) des parois transversales (4b, 4c).Method according to Claim 1, characterized in that , before folding back the side walls (4a) of the bottom, cutouts (5, 6) are made so as to separate the side walls (4a) from the transverse walls (4b, 4c). Sac d'emballage de produits alimentaires réalisé à partir d'un film (1) comprenant du papier traité pour faire barrière aux graisses au niveau d'une face interne du sac, et comprenant au moins une paroi avant (3a) et une paroi arrière (3b), reliées par des soufflets (3c), un fond (4), et une ouverture de remplissage, caractérisé en ce que le film (1) comprend, au niveau du fond, des bords (4a1, 4b1) destinés à être en contact avec les produits alimentaires qui sont repliés sur eux-mêmes et vers l'extérieur du sac pour éviter tout contact desdits bords (4a1, 4b1) avec les produits alimentaires destinés à être insérés dans le sac.Packaging bag for food products made from a film (1) comprising paper treated to act as a barrier to grease at the level of a internal face of the bag, and comprising at least a front wall (3a) and a rear wall (3b), connected by gussets (3c), a bottom (4), and a filling opening, characterized in that the film ( 1) comprises, at the bottom, edges (4a1, 4b1) intended to be in contact with the food products which are folded over on themselves and towards the outside of the bag to avoid any contact of said edges (4a1, 4b1) with the food products intended to be inserted into the bag. Sac d'emballage selon la revendication 5, caractérisé en ce que le fond (4) du sac est un fond plat.Packaging bag according to Claim 5, characterized in that the bottom (4) of the bag is a flat bottom.
EP22208713.2A 2021-12-02 2022-11-22 Bag for packaging food and fat-resistant products, and method for manufacturing such a bag Pending EP4190546A1 (en)

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FR2112834A FR3129873B1 (en) 2021-12-02 2021-12-02 Grease-resistant food packaging bag, and method of manufacturing such a bag

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366018A (en) * 1965-03-19 1968-01-30 Continental Can Co Apparatus for and method of manufacturing multi-ply bags
US4175478A (en) 1978-03-13 1979-11-27 American Fiber Velope Manufacturing Co. Expansible gusset envelope and method and apparatus for fabricating same
US6533457B1 (en) 1998-09-08 2003-03-18 Chronos Holdings Limited Sack
US8282539B2 (en) 2008-12-22 2012-10-09 Exopack, Llc Multi-layered bags and methods of manufacturing the same
WO2021070097A1 (en) * 2019-10-09 2021-04-15 Oji Fibre Solutions (AUS) Pty Ltd Collapsed hand erectable carton

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366018A (en) * 1965-03-19 1968-01-30 Continental Can Co Apparatus for and method of manufacturing multi-ply bags
US4175478A (en) 1978-03-13 1979-11-27 American Fiber Velope Manufacturing Co. Expansible gusset envelope and method and apparatus for fabricating same
US6533457B1 (en) 1998-09-08 2003-03-18 Chronos Holdings Limited Sack
US8282539B2 (en) 2008-12-22 2012-10-09 Exopack, Llc Multi-layered bags and methods of manufacturing the same
WO2021070097A1 (en) * 2019-10-09 2021-04-15 Oji Fibre Solutions (AUS) Pty Ltd Collapsed hand erectable carton

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