WO2015001231A1 - Packaging bag for food products, in particular intended for cooking the products, and method and installation for producing such a bag - Google Patents

Packaging bag for food products, in particular intended for cooking the products, and method and installation for producing such a bag Download PDF

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Publication number
WO2015001231A1
WO2015001231A1 PCT/FR2014/051628 FR2014051628W WO2015001231A1 WO 2015001231 A1 WO2015001231 A1 WO 2015001231A1 FR 2014051628 W FR2014051628 W FR 2014051628W WO 2015001231 A1 WO2015001231 A1 WO 2015001231A1
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WO
WIPO (PCT)
Prior art keywords
bag
film
paper
web
lip
Prior art date
Application number
PCT/FR2014/051628
Other languages
French (fr)
Inventor
David SEAUME
Original Assignee
Alpem
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 Alpem filed Critical Alpem
Publication of WO2015001231A1 publication Critical patent/WO2015001231A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/82—Forming or attaching windows
    • B31B70/826—Forming or attaching windows involving applying window patches
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/04—Windows or other apertures, e.g. for viewing contents
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/18—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps
    • B65D33/20—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps using pressure-sensitive adhesive
    • 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
    • B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally to 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
    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/82—Forming or attaching windows

Definitions

  • Food packaging bag in particular for cooking products and method and installation for producing such a bag
  • the present invention relates to a food packaging bag, preform, consisting of a folded sheet constituting the rear face and the front face forming the edge NCI interior of the bag whose upper edge forms the opening with a lip bordering the rear face and a lip bordering the front face, intended to be connected to each other to close the bag, the folded web being welded to the two edges connecting the rear face to the front face.
  • packaging food products of the type defined above for receiving products, which have just been cooked or roasted for example packaging bags for roast chickens.
  • a bag consists of a sleeve welded to the back in the direction of its length, that is to say, the height of the bag.
  • the sleeve consists of a weldable film covered by paper.
  • the lower part of the bag is folded to form a solid bottom resistant to the weight of the product placed in the bag with, if necessary, also cooking juice.
  • the bag has on its front face a window to see the contents and the upper part is covered.
  • the bag is provided with a bellows to give it the section necessary for the size of a "three-dimensional" product such as a chicken half or product of this type.
  • the bellows on both sides are integrated into the folded fold that ends the base of the bag.
  • This bag has the disadvantage of not having any sealing means in its upper part, which is not necessary for such a bag held vertically so that the juice released by the product does not
  • the manufacturing is relatively complex because the transparent film is fixed to the paper and the film is then folded over its width to form the tube which must be closed in the longitudinal direction; the film must be glued on its edges and the free part of the paper which protrudes from one of the edges of the film must itself be glued to the paper on the other side.
  • such a bag is welded to form the tube and then the tube cut to length requires folding with a very complex welding of the lower end, since the film must first be welded transversely and then folded so as to stick the paper surface folded against the remainder of the bag above the already welded and folded line.
  • Closing the base of the bag is complex because it is necessary on the one hand to weld the bellows along each of the two edges up the bag and also solder the intermediate portion between the bellows to close the bag tightly and then complete this complex weld by folding the edge of the bag on one or two folds and finally stick the folded portion against the portion beyond the fold line by applying the adhesive transversely.
  • the present invention aims to develop a packaging bag of food products especially for cooking products in a sachet is a simple bag to achieve and economic, while offering all the qualities of holding the bag for transport and the handling of the packaged product.
  • the subject of the present invention is a bag for packaging food products of the type defined above, characterized in that the sheet comprising a transparent film constituting the inside of the bag, a main transverse strip of bonded paper to the film to externally cover the l arg of the bag and extends continuously over a height from the back to the return beyond the lower fold to cover the.
  • the packaging bag according to the invention which is particularly suitable for food products and intended to be cooked or heated in the bag has the advantage of constituting in a very simple manner, a perfectly hermetic bag suitable for cooking a food product placed in the bag with a certain amount of liquid or giving off liquid during cooking or reheating.
  • This bag has the advantage of having a relatively large transparent surface allowing the product to be clearly seen inside the bag, in particular to monitor the cooking while using, thanks to the paper of the main band and the auxiliary band, which ensures the rigidity of the bag, a film of transparent plastic food material, relatively small thickness since the bag is held by the strips of paper and the connection between the paper strips of the rear face and the front face the bag spanning also and partly, the transparent surface formed by the single film.
  • the bag according to the invention is of a particularly simple embodiment since the transparent surface is made between two transverse strips of paper which are in fact longitudinal strips unwound and glued to the transparent film in the longitudinal direction of the film which is also directed continuous manufacture of such bags.
  • the entire bag is made continuously until it is cut from the composite strip.
  • This continuous manufacture has the advantage of efficiency and a high yield, resulting also thanks to the reduction of the material used for such a bag at a relatively low overall price.
  • the rear lip is provided with a bead of adhesive covered by a removable protective tape.
  • This rear lip thus protected and the front lip, folded, facilitate the mtrodixction of the product usually wet or wet in the bag without this introduction then hinders the closure of the bag since the front lip is turned and comes not in contact directly with the food product at the time of its introduction into the bag, and secondly the bead of adhesive of the rear lip is protected by the removable tape which receives the possible soil.
  • the upper corner or corners of the rear face are truncated so as to easily access the protective tape to peel it and release the bead of adhesive for closing the bag by gluing the front lip on the lip back.
  • the subject of the invention is also a method for manufacturing a bag for packaging food products, especially for cooking, this method being characterized in that a solderable transparent film is rewound with a width substantially equal to the developed height of the product.
  • bag to be made we turn a main strip of paper substantially equal in width.
  • the developed height of the rear face and the lower zone of the bag which is fixed on the film from the first edge of the film, an auxiliary web of paper of width equal to the developed height of the upper zone is rewound with the lip before being fixed on the film from its second edge so as to leave between the two zones, the film released to form the transparent intermediate zone, and thus achieve the composite web in which the bags are folded, welding and cutting sections corresponds to shaped bags of the continuous composite web.
  • the composite ply is continuously folded, the edges of the sections are welded to form the bags and the bags are cut to separate them from the composite ply.
  • the inner face of the main strip of paper and the inner face of the auxiliary strip of paper are coated with a water-based adhesive which moistens only the strips of paper so that they can be applied directly onto the paper web. the transparent film,
  • the method according to the invention thanks to the particular structure of the bag to be produced consists of continuous operations on the composite strip, which is advantageous for the production efficiency.
  • the invention also relates to a pouch manufacturing facility as defined above and implementing the method of the invention.
  • This installation is characterized in that it comprises a supply of transparent transparent film, a main web supply of paper with a water-based adhesive coating device and a compression device of the main strip coated against the transparent film , an auxiliary web supply of paper with a water-based adhesive coating device and an auxiliary tape compression device coated against the film, a bag-shaping device from the composite film-formed web, and of the two main and auxiliary strips, the folding of the front lip, of the front face relative to the rear face and cutting bags completed but still related to the composite web.
  • the installation is split with respect to the first side of the film over a double width to achieve symmetrically and simultaneously, each time two bags, head to tail in the composite sheet until their separation.
  • the symmetrical duplication of the installation allows particularly efficient manufacturing, since all the operations are split symmetrically without complicating the installation or reducing the speed of manufacture.
  • FIG. 1 is a simplified front view of a packaging bag laid flat
  • FIG. 1A is a cross section of the bag of FIG. 1,
  • FIG. 2 is an enlarged view of the bag in cross-section
  • FIG. 3 shows in its parts A, B, C an installation and / or method of manufacturing packaging bags such as those of FIGS. 1 and 2:
  • Figure 3A is a plan view of the production line
  • FIG. 3B is a side view of the portion of the production line corresponding to the supply and removal of the main strip of paper
  • Figure 3C is a side view similar to that of Figure 3D for the supply and removal of the auxiliary band.
  • FIG. 4 schematically shows sectional views of the manufacture of. bag corresponding to steps of manufacture of the bag.
  • FIG. 5A is a schematic isometric view of the folded bag but not yet welded.
  • FIG. 5B is an isometric view of the pouch of FIG. 6A once the sides are welded.
  • the height of the bag H the measurement of the bag held in a vertical position, with its opening closed or not, facing upwards and its folded edge at the bottom.
  • the width (1) of the bag is the dimension thereof between its two side edges.
  • the direction in which scrolls the transparent film receiving the paper strips to form the composite web to produce the bags by folding, welding and cutting is the so-called “longitudinal” direction (direction x).
  • the width (L) of the strip is the dimension film in the direction (y) perpendicular or transverse to the direction (x).
  • the bag 100 is a food packaging bag which, before receiving the products, is generally in a flat state with a rear face 1 10 and a front face 120
  • the front face 120 and the rear face 1 10 are made by folding a composite sheet 250 formed of a transparent film 150 of weldable plastic material constituting the inside of the bag and carrying on the outside on the back side, a paper strip 200 which covers the entire rear face, continuously and overflows on the front, by a return 104 forming a lower transverse area.
  • the bag comprises an auxiliary strip of paper 220 forming the upper zone z3.
  • This auxiliary paper web 220 is an upper transverse web also comprising the front lip 121, shown folded.
  • the upper edge of the rear face 1 10 has a rear lip 1 January 1, unfolded but preferably lined with a bead of adhesive January 12 covered by a removable protective strip 1 14.
  • the one or both upper corners 1 13 of the lip 1 1 1 are cut or truncated so as to facilitate the gripping and removal of the strip 114. Which reaches the corner (s).
  • the protective strip is removed from the adhesive surface and the front lip 121 is folded over the rear lip 11 to seal the bag 100.
  • the main strip of paper 200 is a transverse band for the orientation of the bag 100 which extends from one edge 101 to the other edge 102 of the bag, as well as the auxiliary strip of paper 220 which is also a transverse strip
  • the transparent film 150 of sealable plastic material also extends from one edge to the other 101, 102 of the bag.
  • the assembly of the film 150 and the paper strips 200, 220 are made by gluing with a water-based glue impregnating the paper strips 200, 220 without wetting them to subsequently form by assembly the composite web of 250 in which are fashioned the bags 100,
  • the two edges 101, 102 of the bag are assembled by welding the film 150 along two welded bands 100a, 102a.
  • Figure 1A gives dimensional indications for the identification of the different parts of the bag 100 during manufacture.
  • the bag has a total height H which corresponds schematically to the height of its rear face 110. This height is also that of the front face 120 of the bag before the folding of the front lip 121 or when the front lip 121 is glued to the lip of the rear face 111,
  • This figure also shows the height H1 of the lower zone 31, the height H2 of the transparent intermediate zone z2 and the height H3 of the upper zone z3 without the height H4 of the folded front lip 121.
  • the heights are measured in the direction ( y) and the width (t) of the bag in the direction (x), these two directions being shown in FIG. 3A.
  • FIG. 2 shows more schematically and by exaggerating the thicknesses, the "vertical" sectional view of the bag 100 of FIGS. 1 and 2A, highlighting the different characteristics of the bag and in particular the fold 130 constituting the lower edge 103 of the bag.
  • This fold 130 is marked at the time of manufacture thanks to the shape memory of the paper covering the film of the rear face 110 and. returning to the front to constitute the return 104 closing the lower zone zl.
  • the fold 122 connecting the front lip 121 to the upper part of the front face 120 also has the advantage of having a shape memory thanks to the auxiliary band of paper 120 which makes it possible to hold the front lip 121 in the folded position, during and after making the fold during manufacture.
  • Figure 2 shows the continuity of the transparent film, 150 filling the bottom surface of the bag 100.
  • a manufacturing method and a pouch manufacturing plant as described above will be presented hereinafter with reference to FIGS. 3, 4 and 5,
  • Fig. 3A is a schematic top view of the beginning of the bag manufacturing line and Figs. 3B, 3C are side views of the main paper web 200 and the auxiliary web 220.
  • the transparent plastic film 150 is unwound from a spool 300 and then a main strip 200 and an auxiliary strip 220 of paper are unwound on the transparent film downstream of its spool, the underside is coated in a coating device 310, preferably with a water-based glue which impregnates itself into the paper and moistens it simply without wetting it, which makes it possible to apply the main strip 200 against the film 150 from its first side 150a as shown schematically by a cylinder 311.
  • a coating device 310 preferably with a water-based glue which impregnates itself into the paper and moistens it simply without wetting it, which makes it possible to apply the main strip 200 against the film 150 from its first side 150a as shown schematically by a cylinder 311.
  • the auxiliary strip 220 is unwound from a coil and its inner face is coated with water-based adhesive, like the main strip, with a coating device 320.
  • the auxiliary strip 220 coated with glue, moistening this strip without wetting them, is applied against the film 150 from the second edge 150b as shown schematically by the cylinder 321.
  • the assembly thus formed circulates continuously in the X direction.
  • FIGS. 3A-3C also show lines and arrows indicating each time the length of a section 260 of the composite strip 250 corresponding to a bag.
  • the various folding and folding operations followed by welding and cutting are preferably carried out following the assembly of the main band 200 and the auxiliary band 220 of film 150. But this composite web 250 may also be temporarily wound to be subsequently shaped and form the bags,
  • the film web 150, the paper main web 200 and the paper web 220 correspond to the dimensions of the paper bag 100 given in FIG. 1A.
  • the width l of the transparent weldable film 150 is twice the height H of the bag since the film covers its entire inner surface.
  • the width Li of the main band 200 is equal to the height H of the rear face 1 10 of the bag and the height Hi of the return 104 of the main strip of paper which comes on the front face beyond the lower fold 103.
  • This lower fold 103 is schematized by the center line 230 since it is practically in the middle of the width L of the film 150.
  • the line corresponding to the fold 231 of the front lip 120 is also shown schematically in FIG. 3A.
  • the auxiliary band 220 has a large ir L2 equal to the height H3 of the upper zone z3 and the height H4 (length) of the front lip 120,
  • Figure 4 shows in its parts I-IV schematic cross sections of the manufacturing line of Figures 3A-3C.
  • Part ⁇ represents a cross-section of the transparent film 150, Part II, the laying of the main band 200 and the auxiliary strip 220 and the piirtie III folding the edge of the film 150 with the auxiliary strip 220 at the fold line 122, 231 of the front lip 120.
  • Part IV shows the folding of the composite ply 250 thus formed, on a folding cone 330 or device of this type.
  • the composite ply 250 is then welded transversely along the lines separating the sections 260 of the sachets, then the sections are separated by cuts in the middle of the welding line or between two welding lines if the sections are separated each time by a double welding line.
  • the different parts I-IV of FIG. 4 have been aligned along the fold line 230 to facilitate the presentation of the succession of operations performed on the composite sheet 250.
  • FIGS. 5A, 5B show two states of a bag 100 revealing at an angle different from that of the preceding figures, the structure of the bag 100 according to the invention.
  • the auxiliary band 120 occupies the entire width of the upper part of the future bag.
  • the width of the transparent film 105 corresponds to the entire width of the bag.
  • Figure SB shows that the welded strips 101a, 102a extend over the entire height of the front face 120 between the edge 101 and the fold line 122; these welded strips concern both the composite web at the return 104 as much as the intermediate zone z2 and the only film 150 forming the transparent surface 125 as the upper zone z3 with the auxiliary belt 220.
  • the method according to the invention for producing a bag 100 consists of producing a composite sheet 250 by gluing on a 150 sealable transparent plastic film 150, a main strip of paper 200 and an auxiliary strip of paper 220 leaving between these a transparent zone 125 formed by the single transparent film 150 and then shaping the composite web 250 having iongi- tudinalement this same structure to achieve continuously the front lip 121 by folding the web side 150b of the auxiliary web of paper 220 and then fold the portion of the web 250 which corresponds to the front face 120 by the fold 130 on the remaining part in the transverse direction, that is to say that of the future rear face 110, on top of one another to then weld transversely the edges 101, 102 of the future bags 100, if necessary make the one or more lips glued and protected by one or two removable ribbons to then detach one by one the bags of this composite web 250, continuous, and shaped continuously.
  • the installation according to the invention for the implementation of the method comprises, as already described, a transparent film supply such as a coil of wire which is. unwinding according to a production line and in parallel a main paper web feed system 200 and an auxiliary paper web feed 220 each with a coating device on the inner side of the paper web with a web adhesive. the water impregnating and moistening the strips of paper to allow their bonding, directly to the film and then the folding forming means, depositing a bead of adhesive, a removable protective tape and a transverse welding device to realize the sides of the bags and finally the cutting of the bags one after the other.
  • a transparent film supply such as a coil of wire which is. unwinding according to a production line and in parallel a main paper web feed system 200 and an auxiliary paper web feed 220 each with a coating device on the inner side of the paper web with a web adhesive.
  • the installation as described above is split and it uses a transparent film of double width of the developed length of a bag to produce simultaneously and by section, two bags placed head- spade into the composite web on the production line.

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

Abstract

Preformed packaging bag for food products, produced from a web that is folded to form the lower edge of the bag and is welded at the two edges that connect the rear face and the front face. The composite web (250) comprises a transparent film (150) that forms the interior of the bag (100) and a transverse strip of paper (200) that is adhesively bonded to the film in order to externally cover the width (ℓ) of the bag (100) continuously over a height running from the rear face (110) to the turnup (104) beyond the bottom fold (130), and an auxiliary transverse strip of paper (220) that is adhesively bonded to the film (150) in order to cover the top of the front face (120), including the lip (121).

Description

ï  ï
« Sachet d'emballage de produits alimentaires, notamment destiné à la cuisson des produits ainsi que procédé et installation pour la réalisation d'un tel sachet » "Food packaging bag, in particular for cooking products and method and installation for producing such a bag"
Domain de l^nvention Domain of the invention
La présente invention se rapporte à un sachet d'emballage de produits alimentaires, prêformé, composé d'une nappe repliée constituant la face arrière et la face avant formant le bord infé rieur du sachet dont le bord supérieur constitue l'ouverture avec une lèvre bordant la face arrière et une lèvre bordant la face avant, destinées à être reliées Tune à l¾.utre pour fermer le sachet, la nappe repliée étant soudée sur les deux bords reliant la face arrière à la face avant. The present invention relates to a food packaging bag, preform, consisting of a folded sheet constituting the rear face and the front face forming the edge NCI interior of the bag whose upper edge forms the opening with a lip bordering the rear face and a lip bordering the front face, intended to be connected to each other to close the bag, the folded web being welded to the two edges connecting the rear face to the front face.
Etat de la technique State of the art
On, connaît des emballages de produits alimentaires du type défini ci-dessus pour recevoir des produits, qui viennent d'être cuits ou rôtis, par exemple des sachets d'emballage pour des poulets rôtis. Un tel sachet se compose d'un manchon soudé au dos dans le sens de sa longueur, c'est-à-dire de la hauteur du sachet. Le manchon se compose d'un film soudable couvert par du papier. La partie inférieure du sachet est repliée pour former un fond solide résistant au poids du produit placé dans le sac avec, le cas échéant, également du jus de cuisson. Le sachet comporte sur sa face avant une fenêtre permettant de voir le contenu et la partie supérieure est couverte. Sur ses côtés, le sachet est muni d'un soufflet pour de lui donner la section nécessaire à la taille d'un produit « tridimensionnel » tel qu'une moitié de poulet ou produit de ce type. Le soufflet des deux côtés est intégré dans le pli retourné qui termine la base du sachet. Ce sachet a l'inconvénient de ne comporter aucun moyen de scellement dans sa partie supérieure, ce qui n'est pas nécessaire par un tel sachet tenu verticalement de façon que le jus dégagé par le produit ne s'en échappe pas.  There are known packaging food products of the type defined above for receiving products, which have just been cooked or roasted, for example packaging bags for roast chickens. Such a bag consists of a sleeve welded to the back in the direction of its length, that is to say, the height of the bag. The sleeve consists of a weldable film covered by paper. The lower part of the bag is folded to form a solid bottom resistant to the weight of the product placed in the bag with, if necessary, also cooking juice. The bag has on its front face a window to see the contents and the upper part is covered. On its sides, the bag is provided with a bellows to give it the section necessary for the size of a "three-dimensional" product such as a chicken half or product of this type. The bellows on both sides are integrated into the folded fold that ends the base of the bag. This bag has the disadvantage of not having any sealing means in its upper part, which is not necessary for such a bag held vertically so that the juice released by the product does not escape.
En outre, la fabrication est relativement complexe car le film transparent est fixé au papier et le film est ensuite repliée sur sa largeur pour former le tube qui doit être fermé dans la direction longitudinale ; le film doit être collé sur ses bords et la partie libre du papier qui dépasse d'un des bords du film doit elle-même être collée sur le papier de l'autre bord. In addition, the manufacturing is relatively complex because the transparent film is fixed to the paper and the film is then folded over its width to form the tube which must be closed in the longitudinal direction; the film must be glued on its edges and the free part of the paper which protrudes from one of the edges of the film must itself be glued to the paper on the other side.
La fabrication de ce sachet nécessite surtout une opération complexe de collage, soudage et repliage du bord inférieur pour réaliser une fermeture étanche d'autant plus compliquée qu'elle ne peut se faire en continu sur le tube.  The manufacture of this bag requires above all a complex operation of bonding, welding and folding the lower edge to achieve a tight seal all the more complicated that it can be done continuously on the tube.
En résumé, un tel sac est soudé pour former le tube et ensuite le tube coupé à la longueur nécessite un repliage avec un soudage très complexe de l'extrémité inférieure, puisque le film doit d'abord être soudé transversalement puis replié de façon à coller la surface de papier repliée contre le restant du sac au-dessus de la ligne déjà soudée et pliée.  In summary, such a bag is welded to form the tube and then the tube cut to length requires folding with a very complex welding of the lower end, since the film must first be welded transversely and then folded so as to stick the paper surface folded against the remainder of the bag above the already welded and folded line.
Ces opérations complexes et délicates à exécuter ne peuvent se faire longitudinalement dans la direction du tube. La fermeture de la base du sac est complexe car il faut d'une part souder le soufflet le long de chacun des deux bords remontant du sac et souder aussi la partie intermédiaire entre les soufflets pour fermer le sac de manière étanche puis compléter cette soudure complexe en repliant le bord du sac sur un ou deux plis et enfin coller la partie repliée contre la partie au-delà de la ligne de pliage en appliquant la colle transversalement.  These complex and delicate operations to be performed can not be done longitudinally in the direction of the tube. Closing the base of the bag is complex because it is necessary on the one hand to weld the bellows along each of the two edges up the bag and also solder the intermediate portion between the bellows to close the bag tightly and then complete this complex weld by folding the edge of the bag on one or two folds and finally stick the folded portion against the portion beyond the fold line by applying the adhesive transversely.
Ces différentes opérations aboutissent à un sac coûteux qui convient pour l'emballage de produits élaborés cuits ou rôtis mais non pour les produits alimentaires qui sont à cuire et/ ou à préparer puis à cuire.  These different operations result in an expensive bag that is suitable for the packaging of elaborate products cooked or roasted but not for the food products that are to be cooked and / or to prepare and then to cook.
But de V inye nt ioa Purpose of V inye nt ioa
La présente invention a pour but de développer un sachet d'emballage de produits alimentaires notamment destinés à la cuisson des produits dans un sachet soit un sachet simple à réaliser et économique, tout en offrant toutes les qualités de tenue du sac pour le transport et la manipulation du produit emballé.  The present invention aims to develop a packaging bag of food products especially for cooking products in a sachet is a simple bag to achieve and economic, while offering all the qualities of holding the bag for transport and the handling of the packaged product.
- Exposé et avantages de l'invention - Presentation and advantages of the invention
A cet effet, la présente invention a pour objet un sachet d'emballage de produits alimentaires de type défini ci-dessus caractérisé en ce que la nappe comprenant un film transparent constituant l'intérieur du sachet, une bande principale transversale de papier collée au film pour couvrir extérieurement la l argeur du sachet et s 'étendan t en continu sur une hauteur allant de la face arrière jusqu'au retour au- delà du pli inférieur pour couvrir la. partie inférieure de la face avant et y former une zone inférieure de papier, une bande auxiliaire transversale de papier collée au film pour couvrir le haut de la face avant y compris la lèvre, englober le pli de la lèvre et descendre en formant une zone supérieure couverte, en direction de la zone inférieure, laissant une zone transversale intermédiaire, découvrant le film transparent, la bande principale et la bande auxiliaire s 'étendant d'un bord à l'autre de la face arrière et de la face avant et le film transparent s'étendant sur la largeur de la face arrière et de la face avant. For this purpose, the subject of the present invention is a bag for packaging food products of the type defined above, characterized in that the sheet comprising a transparent film constituting the inside of the bag, a main transverse strip of bonded paper to the film to externally cover the l arg of the bag and extends continuously over a height from the back to the return beyond the lower fold to cover the. lower part of the front face and forming therein a lower area of paper, a transverse auxiliary strip of paper glued to the film to cover the top of the front face including the lip, encompass the fold of the lip and descend to form an upper zone covered, towards the lower zone, leaving an intermediate transverse zone, exposing the transparent film, the main band and the auxiliary band extending from one edge to the other of the rear face and the front face and the film transparent over the width of the back face and the front face.
Le sachet d'emballage selon l'invention qui convient notamment pour des produits alimentaires et destinés à être cuits ou chauffés dans le sachet à l'avantage de constituer de manière très simple, un sachet parfaitement hermétique convenant à la cuisson d'un produit alimentaire placé dans le sachet avec une certaine quantité de liquide ou dégageant du liquide à la cuisson ou au réchauffage. Ce sachet à l'avantage d'avoir une surface transparente relativement importante permettant de bien voir le produit à l'intérieur du sachet notamment pour en surveiller la cuisson tout en utilisant, grâce au papier de la bande principale et de la bande auxiliaire, qui assure la rigidité du sachet, un film de matière plastiq^ie alimentaire transparent, d'épaisseur relativement réduite puisque la tenue du sachet est assurée par les bandes de papier et la liaison entre les bandes de papier de la face arrière et de la face avant du sachet enjambant également et en partie, la surface transparente constituée par le seul film.  The packaging bag according to the invention which is particularly suitable for food products and intended to be cooked or heated in the bag has the advantage of constituting in a very simple manner, a perfectly hermetic bag suitable for cooking a food product placed in the bag with a certain amount of liquid or giving off liquid during cooking or reheating. This bag has the advantage of having a relatively large transparent surface allowing the product to be clearly seen inside the bag, in particular to monitor the cooking while using, thanks to the paper of the main band and the auxiliary band, which ensures the rigidity of the bag, a film of transparent plastic food material, relatively small thickness since the bag is held by the strips of paper and the connection between the paper strips of the rear face and the front face the bag spanning also and partly, the transparent surface formed by the single film.
Le sachet selon l'invention est d'une réalisation particulièrement simple puisque la surface transparente est réalisée entre deux bandes transversales de papier qui sont en fait des bandes longitudinales dévidées et collées au film transparent dans la direction longitudinale du film qui est également à la direction de fabrication continue de tels sachets. Tout le sachet se réalise de façon continue jusqu'à sa découpe de la bande composite. Cette fabrication continue a l'avantage d'une efficacité et d'un rendement, élevé aboutissant grâce également à la réduction du coup des matières utilisées pour un tel sachet à un prix global relativement faible. The bag according to the invention is of a particularly simple embodiment since the transparent surface is made between two transverse strips of paper which are in fact longitudinal strips unwound and glued to the transparent film in the longitudinal direction of the film which is also directed continuous manufacture of such bags. The entire bag is made continuously until it is cut from the composite strip. This continuous manufacture has the advantage of efficiency and a high yield, resulting also thanks to the reduction of the material used for such a bag at a relatively low overall price.
Suivant une autre caractéristique avantageuse, la lèvre arrière est munie d'un cordon d'adhésif couvert par un ruban protecteur amovible. Cette lèvre arrière ainsi protégée et la lèvre avant, rabattue, facilitent l'mtrodixction du produit en général humide, voire mouillé dans le sachet sans que cette introduction ne gêne ensuite la fermeture du sachet puisque la lèvre avant est retournée et en vient pas en contact direct avec le produit alimen taire au moment de son introduction dans le sachet, et d'autre part le cordon d'adhésif de la lèvre arrière est protégé par le ruban amovible qui reçoit l'éventuelle souillure.  According to another advantageous characteristic, the rear lip is provided with a bead of adhesive covered by a removable protective tape. This rear lip thus protected and the front lip, folded, facilitate the mtrodixction of the product usually wet or wet in the bag without this introduction then hinders the closure of the bag since the front lip is turned and comes not in contact directly with the food product at the time of its introduction into the bag, and secondly the bead of adhesive of the rear lip is protected by the removable tape which receives the possible soil.
Suivant une autre caractéristique avantageuse, le ou les coins supérieurs de la face arrière sont tronqués de façon à accéder facilement au ruban protecteur pour le peler et dégager le cordon d'adhésif pour la fermeture du sachet par le collage de la lèvre avant sur la lèvre arrière.  According to another advantageous characteristic, the upper corner or corners of the rear face are truncated so as to easily access the protective tape to peel it and release the bead of adhesive for closing the bag by gluing the front lip on the lip back.
L'invention a également pour objet un procédé de fabrication d'un sachet d'emballage de produits alimentaires notamment destinés à la cuisson, ce procédé étant caractérisé en ce qu'on dévide un film transparent soudable de largeur sensiblement égale à la hauteur développée du sachet à réaliser, on dévide une bande principale de papier de largeur sensiblement égale à. la hauteur développée de la face arrière et de la zone inférieure du sachet que l'on fixe sur le film à partir du premier bord du film, on dévide une bande auxiliaire de papier de largeur égale à la hauteur développée de la zone supérieure avec la lèvre avant que l'on fixe sur le film à partir de son deuxième bord de façon à laisser entre les deux zones, le film dégagé pour former la zone intermédiaire transparente, et réaliser ainsi la nappe composite dans laquelle on façonne les sachets par pliage, soudage et découpe des tronçons correspond à des sachets façonnés de la nappe composite continue.  The subject of the invention is also a method for manufacturing a bag for packaging food products, especially for cooking, this method being characterized in that a solderable transparent film is rewound with a width substantially equal to the developed height of the product. bag to be made, we turn a main strip of paper substantially equal in width. the developed height of the rear face and the lower zone of the bag which is fixed on the film from the first edge of the film, an auxiliary web of paper of width equal to the developed height of the upper zone is rewound with the lip before being fixed on the film from its second edge so as to leave between the two zones, the film released to form the transparent intermediate zone, and thus achieve the composite web in which the bags are folded, welding and cutting sections corresponds to shaped bags of the continuous composite web.
Suivant, une autre caractéristique avantageuse du procédé, on plie en continu la nappe composite, on soude les bords des tronçons pour former les sachets et on coupe les sachets pour les séparer de la nappe composite. Suivant une autre caractéristique avantageuse du procédé, on enduit la face intérieure de la bande principale de papier et la face intérieure de la bande auxiliaire de papier d'une colle à l'eau qui humidifie seulement les bandes de papier pour permettre leur application directement sur le film transparent, According to another advantageous characteristic of the process, the composite ply is continuously folded, the edges of the sections are welded to form the bags and the bags are cut to separate them from the composite ply. According to another advantageous characteristic of the process, the inner face of the main strip of paper and the inner face of the auxiliary strip of paper are coated with a water-based adhesive which moistens only the strips of paper so that they can be applied directly onto the paper web. the transparent film,
Ainsi, globalement le procédé selon l'invention, grâce à la structure particulière du sac à réaliser se compose d'opérations effectuées en continu sur la bande composite, ce qui est avantageux pour le rendement de la fabrication.  Thus, overall, the method according to the invention, thanks to the particular structure of the bag to be produced consists of continuous operations on the composite strip, which is advantageous for the production efficiency.
L'invention a également pour objet une installation de fabrication de sachets tels que définis ci-dessus et mettant en œuvre le procédé de l'invention. Cette installation est caractérisée en ce qu'elle comprend une alimentation en film transparent soudabie, une alimentation en bande principale de papier avec un dispositif d'enduction de colle à l'eau et un dispositif de compression de la bande principale enduite contre le film transparent, une alimentation en bande auxiliaire de papier avec un dispositif d'enduction de colle à l'eau et un dispositif de compression de la bande auxiliaire enduite contre le film, un dispositif de façonnage de sachets à partir de la bande composite formée du film et des deux bandes principale et auxiliaire, le pliage de la lèvre avant, de la face avant par rapport à la face arrière et de découpe des sachets terminés mais encore liés à la nappe composite.  The invention also relates to a pouch manufacturing facility as defined above and implementing the method of the invention. This installation is characterized in that it comprises a supply of transparent transparent film, a main web supply of paper with a water-based adhesive coating device and a compression device of the main strip coated against the transparent film , an auxiliary web supply of paper with a water-based adhesive coating device and an auxiliary tape compression device coated against the film, a bag-shaping device from the composite film-formed web, and of the two main and auxiliary strips, the folding of the front lip, of the front face relative to the rear face and cutting bags completed but still related to the composite web.
Suivant une autre caractéristique avantageuse, Finstallation est dédoublée par rapport au premier côté du film sur une largeur double pour réaliser de manière symétrique et simultanée, chaque fois deux sachets, tête-bêche dans la nappe composite jusqu'à leur séparation.  According to another advantageous characteristic, the installation is split with respect to the first side of the film over a double width to achieve symmetrically and simultaneously, each time two bags, head to tail in the composite sheet until their separation.
Le dédoublement symétrique de l'installation permet une fabrication particulièrement efficace, puisque toutes les opérations sont dédoublées symétriquement sans pour autant compliquer rinstallation ni réduire la vitesse de fabrication.  The symmetrical duplication of the installation allows particularly efficient manufacturing, since all the operations are split symmetrically without complicating the installation or reducing the speed of manufacture.
Dessins drawings
La présente invention sera décrite ci-après de manière plus détaillée à l'aide d'un exemple de sachet d'emballage de produits alimentaires, d'un procédé et d'une installation de fabrication d'un tel sachet représentés dans les dessins annexés dans lesquels : The present invention will be described in more detail below with the aid of an example of a product packaging bag. of a method and an apparatus for manufacturing such a bag shown in the accompanying drawings, in which:
- la figure 1 est une vue de face simplifiée d'un sachet d'emballage mis à plat,  FIG. 1 is a simplified front view of a packaging bag laid flat,
- la figure 1A est une coupe transversale du sachet de la figure 1 , FIG. 1A is a cross section of the bag of FIG. 1,
- la figure 2 est une vue à échelle agrandie du sachet en coupe transversale, FIG. 2 is an enlarged view of the bag in cross-section,
- la figure 3 montre dans ses parties A, B, C une installation et/ ou procédé de fabrication de sachets d'emballage tels que ceux des figures 1 et 2 :  FIG. 3 shows in its parts A, B, C an installation and / or method of manufacturing packaging bags such as those of FIGS. 1 and 2:
* la figure 3A est une vue en plan de la ligne de fabrication,  * Figure 3A is a plan view of the production line,
* la figure 3B est une vue de côté de la partie de la ligne de fabrication correspondant à la fourniture et à la dépose de la bande principale de papier,  FIG. 3B is a side view of the portion of the production line corresponding to the supply and removal of the main strip of paper,
* la figure 3C est une vue de côté analogue à celle de la figure 3D pour la fourniture et la dépose de la bande auxiliaire.  * Figure 3C is a side view similar to that of Figure 3D for the supply and removal of the auxiliary band.
- La figure 4 montre schématiquement des vues en coupe de la fabrication du. sachet correspondant à des étapes de fabrication du sachet.  - Figure 4 schematically shows sectional views of the manufacture of. bag corresponding to steps of manufacture of the bag.
- La figure 5A est une vue schématique isométrique du sachet replié mais non encore soudé.  - Figure 5A is a schematic isometric view of the folded bag but not yet welded.
- La figure 5B est une vue isométrique d sachet de la figure 6A une fois les côtés soudés.  FIG. 5B is an isometric view of the pouch of FIG. 6A once the sides are welded.
Description de modes de réalisation de l'invention  Description of Embodiments of the Invention
Pour faciliter la description, tant du sachet que de ses procédés et installation de fabrication, il sera convenu d'appeler hauteur du sachet H, la mesure du sachet tenu en position verticale, avec son ouverture fermée ou non, tourné vers le haut et son bord replié situé e bas. La largeur (1) du sachet est la dimension de celui-ci entre ses deux bords latéraux.  To facilitate the description, both of the bag and its processes and manufacturing facility, it will be agreed to call the height of the bag H, the measurement of the bag held in a vertical position, with its opening closed or not, facing upwards and its folded edge at the bottom. The width (1) of the bag is the dimension thereof between its two side edges.
La direction suivant laquelle défile le film transparent recevant les bandes de papier pour former la nappe composite pour réaliser les sachets par pliage, soudage et découpe, est la direction dite « longitudinale » (direction x). La largeur (L) de la bande est la dimension du film dans la direction (y) perpendiculaire ou transversale à la direction (x). The direction in which scrolls the transparent film receiving the paper strips to form the composite web to produce the bags by folding, welding and cutting is the so-called "longitudinal" direction (direction x). The width (L) of the strip is the dimension film in the direction (y) perpendicular or transverse to the direction (x).
Aux figures 1 , 1A et 2, le sachet 100 selon l'invention est un sachet d'emballage de produits alimentaires qui, avant de recevoir les produits, est généralement à l'état plat avec une face arrière 1 10 et une face avant 120. La face avant 120 et la face arrière 1 10 sont réalisées en repliant une nappe composite 250 formée d'un film transparent 150 en matière plastique soudable constituant l'intérieur du sachet et portant extérieurement sur la face arrière, une bande de papier 200 qui couvre toute la face arrière, de façon continue et déborde sur la face avant, par un retour 104 formant une zone transversale inférieure. Au- delà de cette zone inférieure dans la partie supérieure de la face avant 120, le sachet comporte une bande auxiliaire de papier 220 formant la zone z3 supérieure. Cette bande auxiliaire de papier 220 est une bande transversale supérieure comprenant également la lèvre avant 121 , représentée repliée.  In Figures 1, 1A and 2, the bag 100 according to the invention is a food packaging bag which, before receiving the products, is generally in a flat state with a rear face 1 10 and a front face 120 The front face 120 and the rear face 1 10 are made by folding a composite sheet 250 formed of a transparent film 150 of weldable plastic material constituting the inside of the bag and carrying on the outside on the back side, a paper strip 200 which covers the entire rear face, continuously and overflows on the front, by a return 104 forming a lower transverse area. Beyond this lower zone in the upper part of the front face 120, the bag comprises an auxiliary strip of paper 220 forming the upper zone z3. This auxiliary paper web 220 is an upper transverse web also comprising the front lip 121, shown folded.
Entre le bord inférieur de la bande auxiliaire 220 et le bord supérieur du retour 104 de la bande principale 200 il subsiste une zone intermédiaire transparente z3 dans laquelle apparaît le film 150 transparent non couvert par le papier. Le bord supérieur de la face arrière 1 10 a une lèvre arrière 1 1 1, non pliée mais de préférence garnie d'un cordon d'adhésif 1 12 couvert par une bande protectrice amovible 1 14. L'un ou les deux coins supérieurs 1 13 de la lèvre 1 1 1 sont découpés ou tronqués de façon à faciliter la préhension et l'enlèvement de la bande 114. Qui arrive jusqu'au(x) coin(s). Après introduction du produit dans le sachet 100, on enlève la bande protectrice de la surface adhë- sive et on rabat la lèvre avant 121 sur la lèvre arrière 1 1 1 de façon à sceller le sachet 100.  Between the lower edge of the auxiliary strip 220 and the upper edge of the return 104 of the main strip 200 there remains a transparent intermediate zone z3 in which the transparent film 150 not covered by the paper appears. The upper edge of the rear face 1 10 has a rear lip 1 January 1, unfolded but preferably lined with a bead of adhesive January 12 covered by a removable protective strip 1 14. The one or both upper corners 1 13 of the lip 1 1 1 are cut or truncated so as to facilitate the gripping and removal of the strip 114. Which reaches the corner (s). After introducing the product into the bag 100, the protective strip is removed from the adhesive surface and the front lip 121 is folded over the rear lip 11 to seal the bag 100.
La bande principale de papier 200 est une bande transversale pour l'orientation du sachet 100 qui s'étend d'un bord 101 à l'autre bord 102 du sachet, de même que la bande auxiliaire de papier 220 qui est aussi une bande transversale s'étendant d'un bord à l'autre 101, 102. Le film transparent 150 de matière plastique soudable va également d'un bord à l'autre 101 , 102 du sachet. L'assemblage du film 150 et les bandes de papier 200, 220 sont faits par collage à l'aide d'une colle à l'eau imprégnant les bandes de papier 200, 220 sans les mouiller pour former ensuite par assemblage la nappe composite de 250 dans laquelle sont façonnés les sachets 100, The main strip of paper 200 is a transverse band for the orientation of the bag 100 which extends from one edge 101 to the other edge 102 of the bag, as well as the auxiliary strip of paper 220 which is also a transverse strip The transparent film 150 of sealable plastic material also extends from one edge to the other 101, 102 of the bag. The assembly of the film 150 and the paper strips 200, 220 are made by gluing with a water-based glue impregnating the paper strips 200, 220 without wetting them to subsequently form by assembly the composite web of 250 in which are fashioned the bags 100,
Les deux bords 101 , 102 du sachet sont assemblés par soudage du film 150 suivant deux bandes soudées 100a, 102a.  The two edges 101, 102 of the bag are assembled by welding the film 150 along two welded bands 100a, 102a.
La figure 1A donne des indications dimensionnelles servant au repérage des différentes parties du sachet 100 en cours de fabrication. Ainsi le sachet à une hauteur totale H qui correspond schêrnatiquement à la hauteur de sa face arrière 110. Cette hauteur est également celle de la face avant 120 du sachet avant le pliage de la lèvre avant 121 ou lorsque la lèvre avant 121 est collée à la lèvre de la face arrière 111 ,  Figure 1A gives dimensional indications for the identification of the different parts of the bag 100 during manufacture. Thus the bag has a total height H which corresponds schematically to the height of its rear face 110. This height is also that of the front face 120 of the bag before the folding of the front lip 121 or when the front lip 121 is glued to the lip of the rear face 111,
Cette figure montre également la hauteur Hl de la zone inférieure 31 , la hauteur H2 de la zone intermédiaire transparente z2 et la hauteur H3 de la zone supérieure z3 sans la hauteur H4 de la lèvre avant repliée 121 , Les hauteurs sont mesurées dans la direction (y) et la largeur (t) du sachet dans la direction (x), ces deux directions étant reportées à la figure 3A.  This figure also shows the height H1 of the lower zone 31, the height H2 of the transparent intermediate zone z2 and the height H3 of the upper zone z3 without the height H4 of the folded front lip 121. The heights are measured in the direction ( y) and the width (t) of the bag in the direction (x), these two directions being shown in FIG. 3A.
La figure 2 montre de manière plus schématique et en exagérant les épaisseurs, la vue en coupe « verticale » du sachet 100 des figures 1 et 2A mettant, en évidence les différentes caractéristiques du sachet et en particulier le pli 130 constituant le bord inférieur 103 du sachet. Ce pli 130 est marqué au moment de la fabrication grâce à la mémoire de forme du papier couvrant le film de la face arrière 110 et. revenant sur l'avant pour constituer le retour 104 fermant la zone inférieure zl .  FIG. 2 shows more schematically and by exaggerating the thicknesses, the "vertical" sectional view of the bag 100 of FIGS. 1 and 2A, highlighting the different characteristics of the bag and in particular the fold 130 constituting the lower edge 103 of the bag. This fold 130 is marked at the time of manufacture thanks to the shape memory of the paper covering the film of the rear face 110 and. returning to the front to constitute the return 104 closing the lower zone zl.
Le pli 122 reliant la lèvre avant 121 à la partie supérieure de la face avant 120 a également l'avantage d'avoir une mémoire de forme grâce à la bande auxiliaire de papier 120 qui permet de tenir la lèvre avant 121 en position repliée, pendant et après la réalisation du pli au cours de la fabrication.  The fold 122 connecting the front lip 121 to the upper part of the front face 120 also has the advantage of having a shape memory thanks to the auxiliary band of paper 120 which makes it possible to hold the front lip 121 in the folded position, during and after making the fold during manufacture.
La figure 2 montre la continuité du film transparent, 150 garnissant la surface inférieure du sachet 100. Un procédé de fabrication et une installation de fabrication du sachet tel que décrit ci-dessus seront présentés ci-après à l'aide des figures 3, 4 et 5, Figure 2 shows the continuity of the transparent film, 150 filling the bottom surface of the bag 100. A manufacturing method and a pouch manufacturing plant as described above will be presented hereinafter with reference to FIGS. 3, 4 and 5,
Cette description sera faite en utilisant les orientations des figures 1 et 1A.  This description will be made using the orientations of FIGS. 1 and 1A.
Ainsi, la direction (x) est. la direction longitudinale du film 150 ou sa direction de défilement alors que la direction (y) est sa direction transversale. La figure 3A est une vue schématique de dessus du début de la ligne de fabrication du sachet et les figures 3B, 3C des vues de côté de la bande principale de papier 200 et la bande auxiliaire 220.  Thus, the direction (x) is. the longitudinal direction of the film 150 or its direction of travel while the direction (y) is its transverse direction. Fig. 3A is a schematic top view of the beginning of the bag manufacturing line and Figs. 3B, 3C are side views of the main paper web 200 and the auxiliary web 220.
Selon les figures 3A et 3B, on dévide le film de matière plastique transparente 150 à partir d'une bobine 300 puis on dévide sur le film transparent, en aval de sa bobine, une bande principale 200 et une bande auxiliaire 220 de papier dont, on a enduit dans un dispositif d'enduction 310 la face inférieure avec de préférence une colle à l'eau qui s'imprègne dans le papier et l'humidifie simplement sans les mouiller, ce qui permet d'appliquer la bande principale 200 contre le film 150 à partir de son premier côté 150a comme cela est schématisé par un cylindre 311.  According to FIGS. 3A and 3B, the transparent plastic film 150 is unwound from a spool 300 and then a main strip 200 and an auxiliary strip 220 of paper are unwound on the transparent film downstream of its spool, the underside is coated in a coating device 310, preferably with a water-based glue which impregnates itself into the paper and moistens it simply without wetting it, which makes it possible to apply the main strip 200 against the film 150 from its first side 150a as shown schematically by a cylinder 311.
En parallèle, selon les figures 3A, 3C, on dévide la bande auxiliaire 220 à partir d'une bobine et on enduit, sa face intérieure avec de la colle à eau, comme la bande principale, avec un dispositif d'enduction 320. Puis la bande auxiliaire 220, enduite de colle, humidifiant cette bande sans les mouiller, est appliquée contre le film 150 à partir du deuxième bord 150b comme cela a été schématisé par le cylindre 321. On obtient ainsi la nappe composite 250 qui sera façonnée dans la suite de la ligne de fabrication pour réaliser les sachets. Si la nappe 250 est d'abord pliée suivant la ligne 23.1 pour former la lèvre avant 120 puis le pliage se fait suivant la ligne de pliage 230 pour plier la face avant 120 et la face arrière 110 l'une contre l'autre avant de souder transversalement les tronçons 260 correspondant chaque fois à un sachet 100.  In parallel, according to FIGS. 3A, 3C, the auxiliary strip 220 is unwound from a coil and its inner face is coated with water-based adhesive, like the main strip, with a coating device 320. the auxiliary strip 220, coated with glue, moistening this strip without wetting them, is applied against the film 150 from the second edge 150b as shown schematically by the cylinder 321. This gives the composite sheet 250 which will be shaped into the following the production line to make the bags. If the web 250 is first folded along the line 23.1 to form the front lip 120 then the folding is done along the fold line 230 to fold the front face 120 and the rear face 110 against each other before transversely weld sections 260 each corresponding to a bag 100.
A côté de ces opérations, il y a également l'application d'un cordon d'adhésif 1 12 sur la lèvre arrière 1 10 et sa couverture par le ruban protecteur 1 14 ainsi que la découpe des coins supérieurs 1 13 de la face arrière 1 10. In addition to these operations, there is also the application of a bead of adhesive 1 12 on the rear lip 1 10 and its cover by the protective tape 1 14 and the cutting of the upper corners 1 13 of the rear face 1 10.
L'ensemble ainsi formé circule en continu dans la direction X.  The assembly thus formed circulates continuously in the X direction.
Les figures 3A-3C montrent également, des traits et des flèches indiquant chaque fois la longueur d'un tronçon 260 de la bande composite 250 correspondant à un sachet.  FIGS. 3A-3C also show lines and arrows indicating each time the length of a section 260 of the composite strip 250 corresponding to a bag.
En aval de la situation représentée à la figure 3, pour obtenir les sachets, les différentes opérations de pliage et de repliage puis soudage et découpage sont faites de préférence à la suite de l'assemblage de la bande principale 200 et de la bande auxiliaire 220 du film 150. Mais cette nappe composite 250 peut également être provisoirement enroulée pour être ensuite façonnée et former les sachets,  Downstream of the situation shown in FIG. 3, in order to obtain the bags, the various folding and folding operations followed by welding and cutting are preferably carried out following the assembly of the main band 200 and the auxiliary band 220 of film 150. But this composite web 250 may also be temporarily wound to be subsequently shaped and form the bags,
La bande de film 150, la bande principale de papier 200 et la bande auxiliaire de papier 220 correspondent aux dimensions du sachet 100 données à la figure 1A.  The film web 150, the paper main web 200 and the paper web 220 correspond to the dimensions of the paper bag 100 given in FIG. 1A.
La largeur l du film transparent soudable 150 est égale au double de la hauteur H du sachet puisque le film couvre toute sa surface intérieure.  The width l of the transparent weldable film 150 is twice the height H of the bag since the film covers its entire inner surface.
La largeur Li de la bande principale 200 est égale à la hauteur H de la face arrière 1 10 du sachet et de la hauteur Hi du retour 104 de la bande principale de papier qui vient sur la face avant au- delà du pli inférieur 103.  The width Li of the main band 200 is equal to the height H of the rear face 1 10 of the bag and the height Hi of the return 104 of the main strip of paper which comes on the front face beyond the lower fold 103.
Ce pli inférieur 103 est schématisé par la ligne médiane, 230 puisqu'il se trouve en pratique sensiblement au milieu de la largeur L du film 150.  This lower fold 103 is schematized by the center line 230 since it is practically in the middle of the width L of the film 150.
La ligne correspondant au pli 231 de la lèvre avant 120 est également schématisée à la figure 3A.  The line corresponding to the fold 231 of the front lip 120 is also shown schematically in FIG. 3A.
La bande auxiliaire 220 a une large ir L2 égale à la hauteur H3 de la zone supérieure z3 et de la hauteur H4 (longueur) de la lèvre avant 120,  The auxiliary band 220 has a large ir L2 equal to the height H3 of the upper zone z3 and the height H4 (length) of the front lip 120,
La figure 4 montre dans ses parties I-IV des coupes transversales schématiques de la ligne de fabrication des figures 3A-3C. La partie ί représente une coupe transversale du film transparent 150, la partie II, la pose de la bande principale 200 et de la bande auxiliaire 220 et la peirtie III le repliage du bord du film 150 avec la bande auxiliaire 220 au niveau de la ligne de pliage 122, 231 de la lèvre avant 120. Figure 4 shows in its parts I-IV schematic cross sections of the manufacturing line of Figures 3A-3C. Part ί represents a cross-section of the transparent film 150, Part II, the laying of the main band 200 and the auxiliary strip 220 and the piirtie III folding the edge of the film 150 with the auxiliary strip 220 at the fold line 122, 231 of the front lip 120.
La partie IV montre le pliage de la nappe composite 250 ainsi formée, sur un cône de pliage 330 ou dispositif de ce type, La nappe composite 250 est ensuite soudée transversalement suivant les lignes séparant les tronçons 260 des sachets puis les tronçons sont séparés par des coupes au milieu de la ligne de soudage ou entre deux lignes de soudage si les tronçons sont chaque fois séparés par une double ligne de soudage.  Part IV shows the folding of the composite ply 250 thus formed, on a folding cone 330 or device of this type. The composite ply 250 is then welded transversely along the lines separating the sections 260 of the sachets, then the sections are separated by cuts in the middle of the welding line or between two welding lines if the sections are separated each time by a double welding line.
Les différentes parties I-IV de la figure 4 ont été alignées selon la ligne de pliage 230 pour faciliter la présentation de la succession des opérations effectuées sur la nappe composite 250.  The different parts I-IV of FIG. 4 have been aligned along the fold line 230 to facilitate the presentation of the succession of operations performed on the composite sheet 250.
Les figures 5A, 5B montrent deux états d'un sachet 100 mettant en évidence sous un angle différent de celui des figures précédentes, la structure du sachet 100 selon l'invention. A la figure 5 3 Ici face arrière 1 10 et la face avant 120 ne sont pas complètement repliées autour du bord inférieur 103 et forment encore entre-elles un dièdre montrant clairement que la bande principale de papier 200 occupe toute la largeur de la face arrière 1 10 et aussi de la face avant 120 pour le retour 104. FIGS. 5A, 5B show two states of a bag 100 revealing at an angle different from that of the preceding figures, the structure of the bag 100 according to the invention. In Figure 5 3 tickets here rear side 1 10 and the front face 120 are not completely folded around the bottom edge 103 and still form they between a dihedron which clearly show that the main paper web 200 occupies the entire width of the rear face 1 10 and also the front face 120 for the return 104.
De même, la bande auxiliaire 120 occupe toute la largeur de la partie supérieure du futur sachet. La largeur du film transparent 105 correspond à toute la largeur du sachet.  Similarly, the auxiliary band 120 occupies the entire width of the upper part of the future bag. The width of the transparent film 105 corresponds to the entire width of the bag.
La figure SB montre que les bandes soudées 101a, 102a s'étend sur toute la hauteur de la face avant 120 entre le bord 101 et la ligne de pliage 122 ; ces bandes soudées concernent à la fois la nappe composite au niveau du retour 104 autant que la zone intermédiaire z2 et le seul film 150 formant la surface transparente 125 que la zone supérieure z3 avec la bande auxiliaire 220.  Figure SB shows that the welded strips 101a, 102a extend over the entire height of the front face 120 between the edge 101 and the fold line 122; these welded strips concern both the composite web at the return 104 as much as the intermediate zone z2 and the only film 150 forming the transparent surface 125 as the upper zone z3 with the auxiliary belt 220.
En conclusion le procédé selon l'invention de réalisation d'un sachet 100 consiste à réaliser une nappe composite 250 en collant sur un film de matière plastique transparente 150 soudable, une bande principale de papier 200 et une bande auxiliaire de papier 220 en laissant entre celles-ci une zone transparente 125 formée par le seul film transparent 150 puis à façonner cette nappe composite 250 ayant iongi- tudinalement cette même structure pour réaliser en continu la lèvre avant 121 par le pliage de la nappe du côté 150b de la bande auxiliaire de papier 220 et ensuite replier la partie de la nappe 250 qui correspond à la face avant 120 par le pli 130 sur la partie restante dans la direction transversale, c'est-à-dire celle de la future face arrière 110, l'une sur l'autre pour ensuite souder transversalement les bords 101, 102 des futurs sachets 100, réaliser le cas échéant la ou les lèvres encollées et protégées par un ou deux rubans amovibles pour ensuite détacher un à un les sachets de cette nappe composite 250, continue, ainsi façonnée en continu. In conclusion, the method according to the invention for producing a bag 100 consists of producing a composite sheet 250 by gluing on a 150 sealable transparent plastic film 150, a main strip of paper 200 and an auxiliary strip of paper 220 leaving between these a transparent zone 125 formed by the single transparent film 150 and then shaping the composite web 250 having iongi- tudinalement this same structure to achieve continuously the front lip 121 by folding the web side 150b of the auxiliary web of paper 220 and then fold the portion of the web 250 which corresponds to the front face 120 by the fold 130 on the remaining part in the transverse direction, that is to say that of the future rear face 110, on top of one another to then weld transversely the edges 101, 102 of the future bags 100, if necessary make the one or more lips glued and protected by one or two removable ribbons to then detach one by one the bags of this composite web 250, continuous, and shaped continuously.
L'installation selon l'invention pour la mise en œuvre du procédé comprend comme déjà décrit, une alimentation en film transparent tel qu'une bobine de fil qui est. dévidée suivant une ligne de fabrication et en parallèle une installation d'alimentation en bande principale de papier 200 et une alimentation en bande auxiliaire de papier 220 avec chaque fois un dispositif d'enduction de al face intérieure de la bande de papier avec une colle à l'eau s 'imprégnant et humidifiant les bandes de papier pour permettre leur collage, directement au film et ensuite les moyens de façonnage par pliage, dépose d'un cordon d'adhésif, d'un ruban protecteur amovible et un dispositif de soudage transversal pour réaliser les côtés des sachets et enfin la coupe des sachets les uns après les autres.  The installation according to the invention for the implementation of the method comprises, as already described, a transparent film supply such as a coil of wire which is. unwinding according to a production line and in parallel a main paper web feed system 200 and an auxiliary paper web feed 220 each with a coating device on the inner side of the paper web with a web adhesive. the water impregnating and moistening the strips of paper to allow their bonding, directly to the film and then the folding forming means, depositing a bead of adhesive, a removable protective tape and a transverse welding device to realize the sides of the bags and finally the cutting of the bags one after the other.
Suivant une autre variante avantageuse de l'invention, l'installation telle que décrite ci-dessus est dédoublée et elle utilise un film transparent de largeur double de la longueur développée d'un sachet pour réaliser simultanément et par tronçon, deux sachets placés tête-bêche dans la nappe composite sur la ligne de fabrication. N O M E C L A T U R E Sachet à fenêtre According to another advantageous variant of the invention, the installation as described above is split and it uses a transparent film of double width of the developed length of a bag to produce simultaneously and by section, two bags placed head- spade into the composite web on the production line. NOMECLATURE Window bag
Bord du sachet Sachet edge
a Bande soudée a welded strip
Bord du sachet Sachet edge
a Bande soudée a welded strip
Bord inférieur plié  Folded lower edge
Retour de la bande principale sur le devant Face arrière  Back of the main band on the front Back side
Lèvre arrière  Rear lip
Cordon d'adhésif  Adhesive cord
Coinfs) tronqué(s)  Coinfs) truncated
Bande protectrice amovible  Removable protective tape
Face avant  Front face
Lèvre avant (repliée)  Front lip (folded)
Pli de la lèvre  Fold of the lip
Surface transparente  Transparent surface
Pli  Fold
Côté(s) soudé(s)  Welded side (s)
Film transparent Transparent film
a Premier bord du film 150a First edge of the movie 150
b Second bord du film 150 b Second edge of the film 150
Bande principale transversale de papier Partie arrière  Main transverse strip of paper Back section
Bande auxiliaire transversale de papier Ligne de pliage  Auxiliary transverse band of paper Folding line
Nappe composite  Composite tablecloth
Tronçons de la nappe composite  Stretches of the composite tablecloth
Bobine de film  Film roll
Dispositif d'enduction de colle  Glue coating device
Cylindre  Cylinder
Dispositif d'enduction de colle  Glue coating device
Cylindre  Cylinder
Cône de pliage zl Zone inférieure Folding cone zl Lower zone
z2 Zone intermédiaire z2 Intermediate zone
z3 Zone supérieure z3 Upper zone
1 Largeur du sachet  1 Width of the bag
H Hauteur du sachet  H Height of the sachet
Hi Hauteur du retour 104  Hi Height of return 104
H2 Hauteur de la surface transparente 125H 2 Height of the transparent surface 125
H3 Hauteur de la zone supérieure z3 H 3 Height of the upper zone z3
H4 Longueur de la lèvre avant 121 H 4 Length of the front lip 121
L Largeur du film transparent  L Transparent film width
Li Largeur de la bande principale de papier Li Width of the main strip of paper
L2 Largeur de la bande auxiliaire de papier L2 Width of the auxiliary paper tape

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°) Sachet d'emballage de produits alimentaires, préformé, composé d'une face avant et d'une face arrière, formées à partir d'une nappe repliée pour former le bord inférieur du sachet dont le bord supérieur constitue l'ouverture avec une lèvre bordant la face arrière et une lèvre bordant la face avant, destinées à être reliées l'une à l'autre pour fermer le sachet, 1) preformed food packaging bag, composed of a front face and a rear face, formed from a folded sheet to form the lower edge of the bag whose upper edge constitutes the opening with a lip bordering the rear face and a lip bordering the front face, intended to be connected to one another to close the bag,
la nappe repliée étant, soudée sur les deux bords reliant, la face arrière à la face avant, the folded ply being welded to the two connecting edges, the rear face to the front face,
sachet d'emballage caractérisé en ce que packaging bag characterized in that
la nappe est une nappe composite (250) comprenant : the web is a composite web (250) comprising:
- un film transparent (150) constituant l'intérieur du sachet (100),  a transparent film (150) constituting the inside of the bag (100),
- une bande principale transversale de papier (200) collée au film pour couvrir extérieurement la largeur (i) du sachet (100) et s 'étendant en continu sur une hauteur allant de la face arrière (1 10) jusqu'au retour (104) au-delà du pli inférieur (130) pour couvrir la partie infé rieure de la face avant (120) et y former une zone inférieure (zl) de papier,  a transverse main web of paper (200) adhered to the film to externally cover the width (i) of the bag (100) and extending continuously over a height going from the rear face (1 10) to the return (104); ) beyond the lower fold (130) to cover the lower portion of the front face (120) and form therein a lower zone (z1) of paper,
- une bande auxiliaire transversale de papier (220) collée au film (150) pour couvrir le haut de la face avant (120) y compris la lèvre (121), englober le pli (122) de la lèvre (121) et descendre en formant une zone supérieure couverte (z3), en direction de la zone inférieure (zl), laissant une zone transversale intermédiaire (z2), découvrant le film transparent (150).  - a transverse auxiliary web of paper (220) adhered to the film (150) to cover the top of the front face (120) including the lip (121), including the fold (122) of the lip (121) and descend into forming a covered upper zone (z3), towards the lower zone (z1), leaving an intermediate transverse zone (z2), exposing the transparent film (150).
- la. bande principale (200) et la bande auxiliaire (220) s'étendent d'un bord (101) à l'autre (102) de la face arrière (1 10) et de la face avant. (120) et  - the. main band (200) and the auxiliary band (220) extend from one edge (101) to the other (102) of the rear face (1 10) and the front face. (120) and
- le film transparent (150) s'étendand sur la largeur de la face arrière (1 10) et de la face avant (120),  the transparent film (150) extends over the width of the rear face (1 10) and the front face (120),
2°) Sachet d'emballage selon la revendication 1 , 2) Packaging bag according to claim 1,
caractérisé en ce que characterized in that
la lèvre arrière (1 1 1) est munie d'un cordon d'adhésif (1 12) couvert par un ruban protecteur amovible (1 14), 3°) Sachet d'emballage selon la revendication 2, the rear lip (1 1 1) is provided with a bead of adhesive (1 12) covered by a removable protective tape (1 14), 3 °) packaging bag according to claim 2,
caractérisé en ce que characterized in that
le ou les coins (1 13) supérieurs de la face arrière (1 10) sont tronqués, the corner or corners (1 13) of the upper rear face (1 10) are truncated,
4°) Procédé de fabrication d'un vsachet d'emballage de produits alimentaires selon l'une quelconque des revendications 1 à 3, 4 °) A method of manufacturing a food packaging vsachet according to any one of claims 1 to 3,
caractérisé en ce qu' characterized in that
- on dévide un film transparent soudable (150) de largeur (L) sensiblement égale à la hauteur développée du sachet à réaliser (100), a solderable transparent film (150) of width (L) substantially equal to the developed height of the bag to be produced (100) is unwound,
- on dévide une bande principale de papier (200) de largeur (Li) sensiblement égale à la hauteur développée de la face arrière (1 10) et de la zone inférieure (zl) du sachet (100) que l'on fixe sur le film (150) à partir du premier bord (150a) du film (150). a paper web (200) of width (Li) substantially equal to the developed height of the rear face (1 10) and the lower zone (z1) of the bag (100) which is fixed on the film (150) from the first edge (150a) of the film (150).
- on dévide une bande auxiliaire de papier (220) de largeur (Ls) égale à la hauteur développée de la zone supérieure (z3) avec la lèvre avant (120) que l'on fixe sur le film (150) à partir de son deuxième bord (150b) de façon à laisser entre les deux zones (zl, z3), le film (150) dégagé pour former la zone intermédiaire (z3) transparente, et. réaliser ainsi la nappe composite (250) dans laquelle on façonne les sachets (100) par pliage, soudage et découpe des tronçons (260) correspond à des sachets (100) façonnés de la nappe composite (250) continue.  a paper auxiliary strip (220) of width (Ls) equal to the developed height of the upper zone (z3) is unwound with the front lip (120) which is fixed on the film (150) from its second edge (150b) so as to leave between the two zones (zl, z3), the film (150) cleared to form the intermediate zone (z3) transparent, and. thus making the composite web (250) in which the bags (100) are shaped by folding, welding and cutting the sections (260) corresponds to shaped bags (100) of the composite web (250) continues.
5°) Procédé de fabrication d'un sachet, d'emballage de produits alimentaires selon la revendication 4, 5 °) A method of manufacturing a bag, packaging food products according to claim 4,
caractérisé en ce qu' characterized in that
on plie en continu la nappe composite (250), on soude les bords des tronçons (260) pour former les sachets et on coupe les sachets (100) pour les séparer de la nappe composite (250). the composite web (250) is continuously folded, the edges of the sections (260) are welded to form the bags and the bags (100) are cut off from the composite web (250).
6°) Procédé de fabrication d'un sachet, d'emballage de produits alimentaires selon la revendication 4, 6 °) A method of manufacturing a bag, packaging food products according to claim 4,
caractérisé en ce qu' characterized in that
on enduit la face intérieure de la bande principale de papier (200) et la face intérieure de la bande auxiliaire de papier (220) d'une colle à l'eau qui humidifie seulement les bandes de papier (200, 220) pour permettre leur application directement sur le film transparent (150). the inner face of the main web of paper (200) and the inner face of the auxiliary web of paper (220) are coated with water-based adhesive which moistens only the strips of paper (200, 220) to allow their application directly to the transparent film (150).
7°) Installation de fabrication de sachets (100) selon Fune quelconque des revendications 1 à 3 mettant en œuvre le procédé selon l'une quelconque des revendications 4 à 6, 7) bag manufacturing plant (100) according to any one of claims 1 to 3 implementing the method according to any one of claims 4 to 6,
installation caractérisé en ce qu'elle comprend : installation characterized in that it comprises:
- une alimentation (300) en film transparent soudable (150),  a power supply (300) made of transparent weldable film (150),
- une alimentation en bande principale de papier avec un dispositif d'enduction de colle à l'eau (310) et un dispositif de compression de la bande principale (200) enduite contre le film transparent (150), a main paper web feed with a water glue coating device (310) and a main web compression device (200) coated against the transparent film (150),
- une alimentation en bande auxiliaire de papier avec un dispositif d'enduction de colle à l'eau (320) et un dispositif de compression (321) de la bande auxiliaire (220) enduite contre le film (150) et,an auxiliary web supply of paper with a water glue coating device (320) and a compression device (321) of the auxiliary strip (220) coated against the film (150) and,
- un dispositif de façonnage de sachet (100) à partir de la bande composite (250) formée du film (150) et des deux bandes principale et auxiliaire (200, 220), de pliage de la lèvre avant (121), de la face avant (120) par rapport à la face arrière (111) et de découpe des sachets (100), terminés mais encore liés à la nappe composite (250). - a bag-shaping device (100) from the composite web (250) formed from the film (150) and the two main and auxiliary strips (200, 220), folding the front lip (121), the front face (120) relative to the rear face (111) and cutting bags (100), completed but still related to the composite web (250).
8°) Installation selon la revendication 7, 8 °) Installation according to claim 7,
caractérisée en ce que characterized in that
l'installation est dédoublée par rapport au premier côté (150a) du film (150) sur une largeur double pour réaliser de manière symétrique et simultanée chaque fois deux sachets (100), tête-bêche dans la nappe composite, jusqu'à leur séparation. the installation is split with respect to the first side (150a) of the film (150) over a double width to produce symmetrically and simultaneously two bags (100), head to tail in the composite web, until they are separated .
PCT/FR2014/051628 2013-07-03 2014-06-26 Packaging bag for food products, in particular intended for cooking the products, and method and installation for producing such a bag WO2015001231A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1356501A FR3008079B1 (en) 2013-07-03 2013-07-03 BAG FOR PACKAGING FOOD PRODUCTS, IN PARTICULAR FOR COOKING PRODUCTS, AND METHOD AND INSTALLATION FOR CARRYING OUT SUCH A BAG
FR1356501 2013-07-03

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WO2015001231A1 true WO2015001231A1 (en) 2015-01-08

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US6033114A (en) * 1998-01-20 2000-03-07 Bagcraft Packaging, L.L.C. Window bag with polyester lining and method of forming same
EP2116476A1 (en) * 2008-05-06 2009-11-11 Alpem Preformed packaging bag, in particular for food products

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022175568A1 (en) * 2021-02-18 2022-08-25 Giatsis Pack S.A. Groupable bag for packaging fresh produce

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FR3008079B1 (en) 2016-03-18
FR3008079A1 (en) 2015-01-09

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