WO2015001220A1 - Packaging bag having a window - Google Patents

Packaging bag having a window Download PDF

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Publication number
WO2015001220A1
WO2015001220A1 PCT/FR2014/051533 FR2014051533W WO2015001220A1 WO 2015001220 A1 WO2015001220 A1 WO 2015001220A1 FR 2014051533 W FR2014051533 W FR 2014051533W WO 2015001220 A1 WO2015001220 A1 WO 2015001220A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag
paper
web
composite
window
Prior art date
Application number
PCT/FR2014/051533
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 WO2015001220A1 publication Critical patent/WO2015001220A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • 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
    • 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
    • B65D33/16—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

  • the present invention relates to a preformed food packaging bag consisting of a front face and a back face, formed from a folded web 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, the folded sheet being welded to the two edges connecting the rear face to the front face .
  • This bag has the advantage of being a window bag allowing to see at least the nature of the contents of the bag to identify it, for example when the bag is grouped with other bags in a storage lie such as a freezer compartment.
  • This bag is of a particularly simple and economical embodiment because the holding of the bag is provided mainly by the paper web of the composite web constituting the bag and which allows to use a transparent film, reduced to its minimum thickness.
  • the invention also avoids the use of a na.ppe formed by a complex composed of a film and a support, which is a relatively expensive product compared to the price of the bag made.
  • the realization of the bag with a composite web made on site also simplifies the manufacture and makes it more flexible to adapt to small series of manufacturing allowing a diversification of manufacturing without the need for complex interventions of reel change. supply of the shaping machine according to the bags manufactured.
  • the window is preferably reduced to the area strictly necessary to allow the contents of the bag to be identified, thus benefiting from the holding of the paper entering the composite sheet.
  • the paper also has the advantage of simplifying the continuous manufacture because, when the composite ply is folded, for example to form the lip of the front face or when it is folded to fold the front face against the rear face, contrary to a film of matter plastic, the paper of the composite web keeps the fold realized, and this before the bag is completed by welding its two edges.
  • the retention of the fold also simplifies the realization of the folded front lip and the application of the bead of glue on the rear lip without having to take particular precaution to position and maintain the front lip or maintain the position of the front face, relative on the back side.
  • the fold of the lip of the front face that the fold of the front face relative to the rear face allows accurate and consistent positioning of the front face in the rear thanks to the orientation given by the fold forming the future lower edge of the bag.
  • the edges of the cutout of the window leave at least one lateral edge bordering the cut with respect to the welded strip, which advantageously contributes to the strength of the bag and its rigidity despite the small thickness of the transparent film closing the window.
  • the window has the shape of a logo or an acronym. This allows the user of the bag, packaging, food distribution company, to mark its acronym not only by printing on the paper surface of the bag but in addition in the form of a window which constitutes a particularly noticeable element of the overall appearance of the bag.
  • the rear lip has one or two truncated corners and carries an adhesive bead covered by a protective tape which protrudes from the truncated corners while remaining in the geometrical outline of the rear lip and that of the bag, defined by the shape overall rectangular.
  • the invention also relates to a method of manufacturing a packaging bag of food products such as those defined above, this method being characterized in that
  • the cut paper strip, coated with glue on the transparent film, is applied to bond and obtain a composite strip
  • the composite strip is shaped so as to fold it making the fold of the front lip, the fold of the bottom of the bag,
  • the composite strip is solid transversely to form and close the sides of the bag
  • the welded bags are cut in the formed composite strip to separate them.
  • the assembly process because of the very simple nature of the bag, is itself very simple and benefits from the important advantage of the paper-based 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 paper strip is coated with a water-based adhesive which moistens the paper web to allow it to be applied directly to the transparent film.
  • This process is then characterized in that a composite strip having a double width of the developed height of a bag is produced by splitting the cutting and gluing operations according to claim 5 so as to simultaneously form, in parallel, two sachets. by a section of composite strip, the bags being on the strip in positions symmetrical with respect to the median axis of the composite strip.
  • a limited area of paper is coated with glue on each section corresponding to a bag.
  • the glue coating on a limited surface does not reduce the strength of the bag and allows a significant saving, This limitation limits and also facilitates the peelability of the film allowing, after use of the bag, to separate the plastic film of the paper for disposal in the form of waste in different sectors.
  • the use of paper besides the stiffening effect, also implicitly simplifies the manufacture since the fixing of the paper on the transparent film, is done with a glue with water which is absorbed by the paper.
  • the glue-coated paper can be fed directly to the film to be adhered to it because the water-based adhesive is applied in a reduced amount to the paper web and absorbed into the paper.
  • the film is a transparent film that can be used for all series of bag making and the paper strip is also a strip of paper that will be cut with different windows and / or printed with different impressions depending on the series of bags to be made and all this using the same process or the same installation by simply changing the shape of the cut or the nature of glue coating or printing on paper.
  • the glue paper web is coated in a limited manner around the cutouts of the window and the contour of the front face, and of the rear face and at the level of the fold, at the level of the lip. rear and the front lip as well as in intermediate points within the contour of the rear face.
  • the coating of the paper strip in a very limited manner along the contour of the front and rear faces and the cutting of the window allows a significant saving of glue without reducing the quality of the product and improving the ecological aspect of the manufacture, so by the reduction of glue than by the ease of the separation of the two components of the bag after use.
  • the invention also relates to an installation for manufacturing a packaging bag as defined above by applying the method also defined above.
  • This installation is characterized in that it comprises a weldable transparent film feed installation, a paper feed installation, a paper preparation line with a printing unit followed by a cut-out device of the window and a glue coating device and a mojre for driving the paper strip thus prepared on the film unwound by the installation for gluing the paper web to the film and forming a composite web, as well as an installation for assembling the paper web and the film and then folding the front lip and the front face relative to the rear face and then the transverse welding to achieve the edges of the bags and cutting the bags of the thus formed composite web.
  • a window packaging bag of food products of the type defined above for receiving hot products which have just been cooked or roasted for example packaging bags for the sale of rotisserie chickens.
  • a packaging bag consists of a sleeve welded in the direction of the length, that is to say, the height of the bag on the back thereof.
  • This sleeve is. consists of a weldable film covered by paper.
  • the lower part of the sleeve is folded to form a solid bottom resistant to the weight of the product placed in the bag with, if appropriate, also cooking juice.
  • the bag has on its front face a window to see the contents and.
  • the upper part is covered on the sides the bag is provided with a bellows to allow to give it the necessary section for a "three-dimensional" product such as a chicken half.
  • the bellows on both sides are integrated into the folded fold that ends the base of the bag.
  • This bag has no means of sealing the bag in its upper part to seal the bag, which is not necessary in general because the bag is held veriiquely so that the juice is not likely to leak or ooze .
  • the manufacture is relatively complex because the transparent film is fixed to the paper and the width of the film is then folded to form the sleeve must be closed in the longitudinal direction, that is to say that the film must be welded to its edges and the free part of the paper that protrudes from one of the edges of the film must itself be glued over the paper of the other edge.
  • This bag requires a complete operation of bonding, welding and folding the lower edge to achieve a closure e reed.
  • such a bag is welded to form the sheath and then the sheath cut to length requires complex folding of the lower end, since the film must first be welded transversely and then folded to stick the paper surface. fold over the remainder of the bag over the welded and folded line.
  • a packaging bag made from a complex web forming the rear face of the bag and extending on the front face beyond the fold forming the lower edge of the bag.
  • a transparent film welded on three sides to the back ply and the return of the front ply.
  • the front ply has a lip to be bonded to the rear lip of the rear ply.
  • This packaging bag is interesting for its qualities of holding and presentation of the products contained in the bag but as it is made in a complex, it is expensive.
  • the complex to be printed before the manufacture of the bag, it creates a certain rigidity in the production and does not allow an integrated manufacturing.
  • the complex is manufactured and printed and supplied in reel for shaping the bags.
  • a manufacturing change requires a reel change which is a relatively heavy operation so that this technique is especially advantageous from the point of view of manufacture for manufacturing large quantities of identical bags.
  • the present invention aims to develop a simple food packaging bag to produce and economic, all offering all the qualities of holding the bag for transporting and handling the packaged product.
  • the invention aims to develop a window bag that is simple and economical manufacturing and offers very flexible manufacturing opportunities to easily change the manufacture of different bags by their printing and / or their window on the same line of fabricatio starting from identical raw materials.
  • the subject of the present invention is a packaging bag of food products of the type defined above, characterized in that the sheet is a composite sheet comprising:
  • FIG. 1 is a front view of a window bag set flat
  • FIG. 1A is a very schematic sectional view of the bag of FIG. 1,
  • FIG. 2 is a diagram showing three steps of the method of manufacturing a window bag according to FIG. 1;
  • FIG. 3 shows a packaging bag manufacturing facility such as that of FIG. 1,
  • FIG. 4 shows schematically four views in very schematic cross section of the bag manufacturing line showing four stages of manufacture of the bag, to. window,
  • FIG. 5 shows in the developed and synthetic position two window bag manufacturing steps according to a variant of the method.
  • the height of the bag the measurement of the bag held in a vertical position, with its opening closed or not turned upwards and its part lower or folded edge located at the bottom.
  • the width of the bag is the dimension of it between these two lateral edges.
  • the direction in which the film receiving the paper web is unwound to form the composite strip in which the bags are made by folding, welding and cutting in the so-called "longitudinal" direction (x direction).
  • the width of the composite strip in the y direction is the dimension of the film in the perpendicular direction.
  • the window 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 110 are made by folding a composite sheet formed of a transparent film.
  • parent 150 of weldable plastic material constituting the inside of the bag and carrying on the outside a strip of paper 200 which covers all its rear face 1 10 and the front face 120, including the front lip 121, shown folded,
  • the rear face 1 10 is full and the front face 120 is provided with one or more windows 125.
  • the portion 210 of the paper strip 200 which covers the rear face 1 10 is full and returns over the fold line 130 on the front face 120 with its cut front portion 220 forming the window 225 while the transparent film 150 covering the inner face of the bag, that is to say the inner face of the rear face and the front face, is. continuous over the entire height of the rear face 1 10 and the front face 120.
  • This transparent film 150 also covers the rear lip 1 1 1 in the extension of the rear face 1 10 and the front lip 121 in the folded position before use and closing the bag 100 in the state shown in FIG. 1.
  • the cutout 225 of the window does not reach the edges 101, 102 of the bag but leaves a lateral edge before the solder zone 101a, 102a of the edges of the bag. bag, to participate in the rigidity of the front face 120.
  • edges 226, 227 of the window are of the same width, the window being in symmetrical position.
  • edges may be of different width depending on the shape of the window.
  • the rear lip 11 1 preferably has one or two cut or truncated corners 13 and is provided with an adhesive bead 112 occupying the entire width of the bag (i.e. the length of the lip 1 1 1 ).
  • This cord January 12 is covered by a protective strip January 14, detachable, protruding at the cut corners 11.3 of the rear lip January 1.
  • the film 150 which appears on the front lip, folded, is without adhesive.
  • Both sides 101, 102 of the bag. 100 are welded by the welding of the respective edges of the film 150 of the front face and the rear face.
  • the window 125 has been presented with a cutout 225 in the front portion 220 of the paper web with a substantially rectangular shape.
  • this window can have very variable forms as will be presented in the following, The function of the window being to allow to see the nature of the contents of the bag without seeing all the content, this window is preferably reduced to one dimension relatively low to keep the bag all its rigidity and strength due to the stiffness of the paper, which reduces the thickness of the transparent film ensuring both sealing of the bag and visibility through the window to a minimum thickness for this function since the film no longer participates in the holding of the bag.
  • This bag 100 has a width £ and an overall height H.
  • FIG. 2 shows three steps of the manufacturing process of the bag of FIG. 1 with a transparent film of solderable transparent plastic material 150 running in the direction (x) as well as a strip of paper 200 intended to form the outer face of the bag and also unwound in the direction (x).
  • the assembly of the two components (150, 200) of the composite ply 250 is continuous and the interrupted transverse lines, represented in the different parts of FIG. 2, are merely theoretical lines delimiting a section 260 of composite ply. 250 corresponding to a packaging bag at the end of manufacture.
  • FIG. 2 shows the treatment carried out on the paper strip alone in the upside-down position, ie showing for replication purposes in parts I and II, the underside of the paper strip 200, returned .
  • the paper web 200 is unwound which has a width (t) in the direction (y) corresponding to twice the height H of a bag 100; the line represented in the middle is in fact both the axis of symmetry and the future fold line 230 of the composite web 250 to form the bag 100.
  • the paper web 200 After making the cutout 225 of the window (I), the paper web 200 passes into an adhesive coating station (II).
  • This coating station applies a glue surface represented in a line speckled 240, 241.
  • This glue coating preferably soluble in water, is applied to the corresponding surface, the rear portion 210 of the paper bag and edge of the cutout 225 of the window and edge of the outline of the front face 220, including the front lip not shown in this step of the method.
  • the glue coating may also be limited to the outline and a few points within the contour.
  • the glue is a water-based adhesive that moistens the inner face of the paper web 200, it can be applied directly to the solderable plastic film 150 to glue these two components together and form the composite web 250.
  • composite web 250 continues to scroll in the direction (x) to fold for example the lip of the front face and the two parts forming the front face and the rear face around the fold line 230 corresponding as indicated above to the line of symmetry or axis line drawn in Figure 2.
  • the front face 120 and the rear face 110 are applied against each other and can then be welded edges not yet cut along the dotted lines.
  • the different sections 260 corresponding each time to a window packaging bag 100 can be cut along their sides (vertical / transverse) (101, 102).
  • the application of glue on the rear lip is done by a step of the continuous process, consisting of applying a bead of adhesive January 12 to the film at the lip 110 of the rear face and then unwind on this tape of glue a protective tape 114 detachable.
  • the upper corners of the lip of the rear face are preferably cut in the composite web 250 before the application of the adhesive tape or after it but before the introduction of the ribbon protector adhesive bead since it must exceed the level of truncated corners,
  • Figure 3 schematically shows an installation for the manufacture of window bags 100 such as those described above.
  • the production line consists of a film feed 300 which unwinds the film and a paper feed 350 which also unwinds the paper web 200. While the film 150 is unwound without undergoing any particular treatment, the hand of paper 200 is first cut in a cutting device 351 to make the cuts 225 of the successive windows and then the "inner" surface of the paper web is coated with glue in a coating device 352. preferably before it does not pass on the guide roll 353 which drives the strip of paper cut and glued on the top of the film 150. Next, the composite web 250 is pressed to reinforce the gluing, then the upper lip is folded and the front face and the face The back are folded over one another and then the pouch blank and folded is cared along its two edges to be then cut in sections, the bags being completed. The operations are made in different positions 301, 302 not detailed.
  • FIG. 4 shows, in its four parts (I-IV), various schematic cross-sections of the manufacture of a paper bag starting from the part which is a schematic cross section of the paper strip 200 which is then cut ( Part II) to form the window and glue the inner face of the paper web and then this paper web is joined to the film 150 (III). Then, in a fourth step (IV), the front lip 121 is folded and in the fifth step, the front face 120 and the rear face 1 10 are folded in fold 130 against each other.
  • FIG. 5 schematically shows the parallel production of two bags 100, 100A with a composite web 250A with a width twice that of the preceding figures.
  • the operations thus described are simultaneously and symmetrically with respect to the axis of movement DD (parallel).
  • the figures presented in fact show the inner sides of the front faces of two bags 100, 100A highlighting the glued, symmetrical surfaces.
  • the second part of the figure shows the front face of two paired bags corresponding to a section 260A of the shaped composite sheet 250A, before the longitudinal cut separating the two bags from one another and the transverse cut-out separating the upstream bag. compared to the downstream trap,
  • Figure 6 in parts I, II, III, shows different window variants 125 B, C, D for bags 100 B, C, D,
  • window of the bags of the preceding figures is a window of some importance occupying a large part of the width of the bag and also of its height, it is possible to produce bags with smaller windows or more windows or still windows corresponding for example to the silhouette of a logo of product or service or sale.
  • This form of window has the advantage of reducing the surface of the bag simply covered by the film so that the rigidity is provided mainly by the paper, which reduces the thickness of the film used and thus the cost of the bag.

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

Abstract

Preformed bag for packaging food products, made up of a front face and a rear face that are formed from a web that is folded to form the lower edge (103), the upper edge of said bag forming the opening having a lip (111). The web is a composite web (250) comprising transparent films (150) that form the interior of the bag, and a longitudinal strip of paper (200) that is adhesively bonded to the film (150) in order to externally cover the web, and is cut (225) in order to produce the window (125) and subsequently coated with adhesive before being applied to the transparent film (150).

Description

« Sachet d'emballage à fenêtre »  "Packing bag with window"
Domaine..de l'invention Domain..of the invention
La présente invention se rapporte à un sachet d'emballage de produits alimentaires, préforrné, 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, la nappe repliée étant soudée sur les deux bords reliant la face arrière à la face avant. Ce sachet a l'avantage d'être un sachet à fenêtre permettant de voir au moins la nature du contenu du sachet pour l'identifier, par exemple lorsque le sachet se trouve regroupé avec d'autres sachets dans un lie de stockage tel qu'un compartiment de congélation. Ce sachet est d'une réalisation particulièrement simple et économique car la tenue du sachet est assurée principalement par la bande de papier de la nappe composite constituant le sachet et qui permet d'utiliser un film transparent, réduit à son épaisseur minimale. L'invention évite également l'utilisation d'une na.ppe formée par un complexe composé d'un film et d'un support, qui constitue un produit relativement coûteux par rapport au prix du sachet réalisé. La réalisation du sachet avec une nappe composite fabriquée sur place simplifie également la fabrication et rend celle-ci plus souple pour l'adapter à des petites séries de fabrication permettant ainsi une diversification de la fabrication sans nécessiter des interventions complexes de changement de bobine d'alimentation de la machine de façonnage suivant les sachets fabriqués.  The present invention relates to a preformed food packaging bag consisting of a front face and a back face, formed from a folded web 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, the folded sheet being welded to the two edges connecting the rear face to the front face . This bag has the advantage of being a window bag allowing to see at least the nature of the contents of the bag to identify it, for example when the bag is grouped with other bags in a storage lie such as a freezer compartment. This bag is of a particularly simple and economical embodiment because the holding of the bag is provided mainly by the paper web of the composite web constituting the bag and which allows to use a transparent film, reduced to its minimum thickness. The invention also avoids the use of a na.ppe formed by a complex composed of a film and a support, which is a relatively expensive product compared to the price of the bag made. The realization of the bag with a composite web made on site also simplifies the manufacture and makes it more flexible to adapt to small series of manufacturing allowing a diversification of manufacturing without the need for complex interventions of reel change. supply of the shaping machine according to the bags manufactured.
Dans le sachet selon l'invention, la fenêtre est de préférence réduite à la surface strictement nécessaire pour permettre d'identifier le contenu du sachet en bénéficiant ainsi de la tenue du pa- pier entrant dans la nappe composite.  In the bag according to the invention, the window is preferably reduced to the area strictly necessary to allow the contents of the bag to be identified, thus benefiting from the holding of the paper entering the composite sheet.
Le papier a également l'avantage de simplifier la fabrication en continu car, lorsque la nappe composite est pliée, par exemple pour former la lèvre de îa face avant ou lorsqu'il est plié pour rabattre la face avant contre la face arrière, contrairement à un film de matière plastique, le papier de la nappe composite conserve le pli réalisé, et cela avant que le sachet ne soit terminé par le soudage de ses deux bords. The paper also has the advantage of simplifying the continuous manufacture because, when the composite ply is folded, for example to form the lip of the front face or when it is folded to fold the front face against the rear face, contrary to a film of matter plastic, the paper of the composite web keeps the fold realized, and this before the bag is completed by welding its two edges.
La conservation du pli simplifie également la réalisation de la lèvre avant repliée et l'application du cordon de colle sur la lèvre arrière sans avoir à prendre de précaution particulière pour positionner et maintenir la lèvre avant ou conserver la position de la face avant, par rapport à la face arrière.  The retention of the fold also simplifies the realization of the folded front lip and the application of the bead of glue on the rear lip without having to take particular precaution to position and maintain the front lip or maintain the position of the front face, relative on the back side.
De plus, le pli ta t de la lèvre de la face avant que le pli de la face avant par rapport à la face arrière permet un positionnement précis et concordant de la face avant sur la fa.ce arrière grâce à l'orientation donnée par le pli formant le futur bord inférieur du sachet.  In addition, the fold of the lip of the front face that the fold of the front face relative to the rear face allows accurate and consistent positioning of the front face in the rear thanks to the orientation given by the fold forming the future lower edge of the bag.
Suivant une caractéristique particulièrement avantageuse, les bords de la découpe de la fenêtre laissent au moins un bord latéral bordant la découpe par rapport à la bande soudée, ce qui parti - cipe avantageusement à la tenue du sachet et à sa rigidité malgré la faible épaisseur du film transparent fermant la fenêtre.  According to a particularly advantageous characteristic, the edges of the cutout of the window leave at least one lateral edge bordering the cut with respect to the welded strip, which advantageously contributes to the strength of the bag and its rigidity despite the small thickness of the transparent film closing the window.
Suivant une caractéristique particulièrement avantageuse, la fenêtre a la forme d'un logo ou d'un sigle. Cela permet à l'utilisateur du sachet, d'emballage, la société de distribution de produits alimentaires, de marquer son sigle non seulement par l'impression sur la surface de papier du sachet mais en plus sous la forme d'une fenêtre qui constitue un élément particulièrement perceptible de l'aspect d'ensemble du sachet.  According to a particularly advantageous characteristic, the window has the shape of a logo or an acronym. This allows the user of the bag, packaging, food distribution company, to mark its acronym not only by printing on the paper surface of the bag but in addition in the form of a window which constitutes a particularly noticeable element of the overall appearance of the bag.
Suivant une autre caractéristique avantageuse, la lèvre arrière a un ou deux coins tronqués et porte un cordon adhésif couvert par un ruban protecteur qui dépasse des coins tronqués tout en restant dans le contour géométrique de la lèvre arrière et celui du sachet, défini par la forme rectangulaire globale.  According to another advantageous characteristic, the rear lip has one or two truncated corners and carries an adhesive bead covered by a protective tape which protrudes from the truncated corners while remaining in the geometrical outline of the rear lip and that of the bag, defined by the shape overall rectangular.
L'invention a également pour objet un procédé de fabrica- tion d'un sachet d'emballage de produits alimentaires tels que ceux définis ci-dessus, ce procédé étant caractérisé en ce qu'  The invention also relates to a method of manufacturing a packaging bag of food products such as those defined above, this method being characterized in that
- on dévide un film transparent soudable de largeur sensiblement égale â la hauteur développée du sachet,  a solderable transparent film of width substantially equal to the developed height of the bag is unwound,
- on dévide une bande de papier de largeur sensiblement égale à la hauteur développée du sachet, - on découpe les fenêtres dans la bande de papier, a paper strip of width substantially equal to the developed height of the bag is unwound, - the windows are cut in the paper strip,
~ on enduit de colle la bande de papier découpée, ~ glue the strip of paper cut,
- on applique la bande de papier découpée, enduite de colle sur le film transparent pour coller et obtenir une bande composite,  the cut paper strip, coated with glue on the transparent film, is applied to bond and obtain a composite strip,
- on façonne la bande composite pour la plier réalisant le pli de la lèvre avant, le pli du fond du sachet, the composite strip is shaped so as to fold it making the fold of the front lip, the fold of the bottom of the bag,
- on solide transversalement la bande composite pour former et fermer les côtés du sachet,  the composite strip is solid transversely to form and close the sides of the bag,
- on découpe dans la bande composite façonnée, les sachets soudés pour les séparer.  the welded bags are cut in the formed composite strip to separate them.
Le procédé d'assemblage, du fait même de la nature très simple du sachet, est lui-même très simple et bénéficie de l'avantage important constitué par la nappe composite à base de papier.  The assembly process, because of the very simple nature of the bag, is itself very simple and benefits from the important advantage of the paper-based composite web.
Suivant une autre caractéristique avantageuse, 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,  According to another advantageous characteristic, 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,
Suivant une autre caractéristique avantageuse du procédé, on enduit la face intérieure de la bande de papier d'une colle à l'eau qui humidifie la bande de papier pour permettre son application directement sur le film transparent.  According to another advantageous characteristic of the process, the inner face of the paper strip is coated with a water-based adhesive which moistens the paper web to allow it to be applied directly to the transparent film.
Bien qu'il soit intéressant de réaliser des sachets avec une bande comjiosite correspondant à la largeur développée d'un seul sachet, il est intéressant de dédoubler facilement le rendement de la fabrication en utilisant une largeur de nappe composite égale au double de la hauteur développée d'un sachet. Ces sachets sont alors réalisés dans des positions symétriques par rapport au plan médian de l'installation ou de la bande composite.  Although it is interesting to produce sachets with a comjiosite band corresponding to the developed width of a single bag, it is interesting to easily split the yield of the manufacture by using a composite web width equal to twice the developed height of a bag. These bags are then made in symmetrical positions relative to the median plane of the installation or the composite strip.
Ce procédé est alors caractérisé en ce qu'on réalise une bande composite ayant, une largeur double de la hauteur développée d'un sachet en dédoublant les opérations de découpe et d'encollage selon la revendication 5 pour façonner simultanément, en parallèle, deux sachets par tronçon de bande composite, les sachets étant sur la bande dans des positions symétriques par rapport à l'axe médian de la bande composite. Suivant une autre caractéristique avantageuse, on enduit, de colle une surface limitée du papier sur chaque tronçon correspondant à un sachet. This process is then characterized in that a composite strip having a double width of the developed height of a bag is produced by splitting the cutting and gluing operations according to claim 5 so as to simultaneously form, in parallel, two sachets. by a section of composite strip, the bags being on the strip in positions symmetrical with respect to the median axis of the composite strip. According to another advantageous characteristic, a limited area of paper is coated with glue on each section corresponding to a bag.
L'enduction de colle sur une surface limitée ne réduit pas la tenue du sachet et permet une économie non négligeable, Cette en- duction limite et facilite également la pelabilité du film permettant, après usage du sachet, de séparer le film de matière plastique du papier pour leur évacuation sous forme de déchets dans des filières différentes.  The glue coating on a limited surface does not reduce the strength of the bag and allows a significant saving, This limitation limits and also facilitates the peelability of the film allowing, after use of the bag, to separate the plastic film of the paper for disposal in the form of waste in different sectors.
L'utilisation du papier, outre l'effet de rigidification, simplifie également implicitement la fabrication puisque la fixation du papier sur le film transparent, se fait avec une colle à l'eau qui est absorbée par le papier. Le papier ainsi enduit de colle peut être conduit directement sur le film pour être collé à celui-ci du fait que la colle à l'eau est appliquée en quantité réduite sur la bande de papier et absorbée dans le papier.  The use of paper, besides the stiffening effect, also implicitly simplifies the manufacture since the fixing of the paper on the transparent film, is done with a glue with water which is absorbed by the paper. The glue-coated paper can be fed directly to the film to be adhered to it because the water-based adhesive is applied in a reduced amount to the paper web and absorbed into the paper.
Ces différentes opérations peuvent être réalisées sur une même machine à partir de produits de départ très simples et non préparés spécialement pour la fabrication de telle ou telle série de sachets.  These different operations can be performed on the same machine from very simple starting materials and unprepared especially for the manufacture of such or such series of bags.
Le film est un film transparent utilisable pour toutes les séries de fabrication de sachets et la bande de papier est également une bande de papier qui sera découpée avec des fenêtres différentes et/ou imprimée avec des impressions différentes suivant la série de sachets à fabriquer et tout ceci à l'aide d'un même procédé ou d'une même installation en modifiant simplement la forme de la découpe ou la nature de l'enduction de colle ou de l'impression faite sur le papier.  The film is a transparent film that can be used for all series of bag making and the paper strip is also a strip of paper that will be cut with different windows and / or printed with different impressions depending on the series of bags to be made and all this using the same process or the same installation by simply changing the shape of the cut or the nature of glue coating or printing on paper.
Suivant une caractéristique avantageuse du procédé, on enduit la bande de papier de colle de façon limitée autour des découpes de la fenêtre et du contour de la face avant, et de la face arrière ainsi qu'au niveau du pli, au niveau de la lèvre arrière et de la lèvre avant ainsi que dans des points intermédiaires à l'intérieur du contour de la face arrière.  According to an advantageous characteristic of the method, the glue paper web is coated in a limited manner around the cutouts of the window and the contour of the front face, and of the rear face and at the level of the fold, at the level of the lip. rear and the front lip as well as in intermediate points within the contour of the rear face.
L'enduction de la bande de papier de manière très limitée suivant le contour des faces avant et arrière et de la découpe de la fenêtre permet une économie importante de colle sans réduction de qualité du produit et en améliorant l'aspect écologique de la fabrication, tant par la réduction de colle que par la facilité de la séparation des deux composants du sachet après usage. The coating of the paper strip in a very limited manner along the contour of the front and rear faces and the cutting of the window allows a significant saving of glue without reducing the quality of the product and improving the ecological aspect of the manufacture, so by the reduction of glue than by the ease of the separation of the two components of the bag after use.
L'invention a également pour objet une installation de fabrication d'un sachet d'emballage tel que défini ci-dessus en appliquant le procédé lui aussi défini ci-dessus. Cette installation est caractérisée en ce qu'elle comporte une installation d'alimentation en film transparent soudable, une installation d'alimentation papier, une ligne de préparation du papier avec un groupe d'impression suivie d'un dispositif de découpe de la fenêtre et d'un dispositif d'enduction de colle ainsi qu'un mojre pour conduire la bande de papier ainsi préparée sur le film dévidé par l'installation pour coller la bande de papier au film et former une nappe composite, ainsi qu'une installation d'assemblage de la bande de papier et du film puis le pliage de la lèvre avant et de la face avant par rapport à la face arrière puis le soudage transversal pour réaliser les bords des sachets et de découpe des sachets de la nappe composite ainsi façonnée.  The invention also relates to an installation for manufacturing a packaging bag as defined above by applying the method also defined above. This installation is characterized in that it comprises a weldable transparent film feed installation, a paper feed installation, a paper preparation line with a printing unit followed by a cut-out device of the window and a glue coating device and a mojre for driving the paper strip thus prepared on the film unwound by the installation for gluing the paper web to the film and forming a composite web, as well as an installation for assembling the paper web and the film and then folding the front lip and the front face relative to the rear face and then the transverse welding to achieve the edges of the bags and cutting the bags of the thus formed composite web.
Etat de la technique  State of the art
On, connaît un sachet d'emballage à fenêtre de produits alimentaires du type défini ci-dessus pour recevoir des produits chauds, qui viennent d'être cuits ou rôtis par exemple des sachets d'emballage pour la vente de poulets de rôtisserie. Un tel sachet d'emballage se compose d'un manchon soudé dans le sens de la longueur, c'est-à-dire de la hauteur du sachet au dos de celui-ci. Ce manchon se. compose d'un film soudable couvert par du papier. La partie inférieure du man- chon 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 les côtés le sachet est muni d'un soufflet pour permettre de lui donner la section nécessaire à un produit « tridimensionnel » telle qu'une moitié de poulet. Le soufflet des deux côtés est intégré dans le pli retourné qui termine la base du sachet. Ce sachet ne comporte aucun moyen de scellement du sachet clans sa partie supérieure pour fermer hermétiquement le sachet, ce qui n'est pas nécessaire en général car le sachet est tenu verii- calement de façon que le jus ne risque pas de fuir ou de suinter. En outre, la fabrication est relativement complexe car le film transparent est fixé au papier et la largeur du film était ensuite repliée pour former le manchon doit être fermé dans la direction longitudinale, c'est-à-dire que le film doit être soudé sur ses bords et la partie libre du papier qui dépasse d'un des bords du film doit elle-même être collée par dessus le papier de l'autre bord. There is known a window packaging bag of food products of the type defined above for receiving hot products, which have just been cooked or roasted for example packaging bags for the sale of rotisserie chickens. Such a packaging bag consists of a sleeve welded in the direction of the length, that is to say, the height of the bag on the back thereof. This sleeve is. consists of a weldable film covered by paper. The lower part of the sleeve is folded to form a solid bottom resistant to the weight of the product placed in the bag with, if appropriate, also cooking juice. The bag has on its front face a window to see the contents and. the upper part is covered on the sides the bag is provided with a bellows to allow to give it the necessary section for a "three-dimensional" product such as a chicken half. The bellows on both sides are integrated into the folded fold that ends the base of the bag. This bag has no means of sealing the bag in its upper part to seal the bag, which is not necessary in general because the bag is held veriiquely so that the juice is not likely to leak or ooze . In addition, the manufacture is relatively complex because the transparent film is fixed to the paper and the width of the film is then folded to form the sleeve must be closed in the longitudinal direction, that is to say that the film must be welded to its edges and the free part of the paper that protrudes from one of the edges of the film must itself be glued over the paper of the other edge.
La fabrication de ce sachet nécessite une opération complète de collage, soudage et repliage du bord inférieur pour réaliser une fermeture é anche.  The manufacture of this bag requires a complete operation of bonding, welding and folding the lower edge to achieve a closure e reed.
En résumé, un tel sachet est soudé pour former la gaine et ensuite la gaine coupée à la longueur nécessite un repliage complexe de l'extrémité inférieure, puisque le film doit d'abord être soudé transversalement puis replié de façon à coller la surface de papier replier contre le restant du sac au-dessus de la ligne soudée et pliêe.  In summary, such a bag is welded to form the sheath and then the sheath cut to length requires complex folding of the lower end, since the film must first be welded transversely and then folded to stick the paper surface. fold over the remainder of the bag over the welded and folded line.
Il s'agit d'opérations complexes qui se suivent mais ne se font pas sur une nappe ou gaine en continu et qui ne peuvent se faire longitudinalement dans la direction de la gaine. Le tronçon de sachet doit d'abord être coupé pour réaliser la fermeture à sa base qui est complexe car il faut d'une part souder le soufflet le long de chacun des deux plis 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 puis coller la partie repliée conter la partie au-delà de la ligne de pliage en appliquant la colle transversalement.  These are complex operations that follow each other but are not done on a continuous sheet or sheath and can not be done longitudinally in the direction of the sheath. The bag section must first be cut to make the closure at its base which is complex because it is necessary firstly to weld the bellows along each of the two folds and also weld the intermediate portion between the bellows to close the bag in a sealed manner then complete this complex weld by folding the edge of the bag on one or two folds and then glue the folded part conter the part beyond the fold line by applying the glue transversely.
Ces différentes opérations complexes aboutissent à un sac coûteux qui convient pour l'emballage de produits venant de cuisson ou de rôtisserie mais est. trop coûteux un emballage courant de produits alimentaires.  These various complex operations result in an expensive bag that is suitable for packaging products from cooking or rotisserie but is. Too expensive a common packaging of food products.
Il est également connu selon le document FR 10 52799, un sachet d'emballage réalisé à partir d'une nappe complexe formant la face arrière du sachet et se prolongeant sur la face avant au-delà du pli formant le bord inférieur du sachet. Au-delà de ce retour de la nappe complexe sur la face avant, il est prévu un film transparent, soudé sur trois côtés à la nappe arrière et au retour de la nappe avant. Dans sa partie supérieure, cette nappe avant comporte une lèvre destinée à être collée à la lèvre arrière de la nappe arrière. It is also known from document FR 10 52799, a packaging bag made from a complex web forming the rear face of the bag and extending on the front face beyond the fold forming the lower edge of the bag. Beyond this return of the complex web on the front face, there is provided a transparent film, welded on three sides to the back ply and the return of the front ply. In his upper part, the front ply has a lip to be bonded to the rear lip of the rear ply.
Ce sachet d'emballage est intéressant par ses qualités de tenue et de présentation des produits contenus dans le sachet mais comme il est réalisé en un complexe, il est coûteux. De plus, le complexe devant être imprimé avant la fabrication du sachet, cela crée une certaine rigidité dans la production et ne permet pas une fabrication intégrée. En effet, le complexe est fabriqué et imprimé puis fourni en bobine pour le façonnage des sachets. Un changement de fabrication nécessite un changement de bobine qui est une opération relativement lourde de sorte que cette technique est surtout avantageuse du point de vue de la fabrication pour des fabrications de quantités importantes de sachets identiques.  This packaging bag is interesting for its qualities of holding and presentation of the products contained in the bag but as it is made in a complex, it is expensive. In addition, the complex to be printed before the manufacture of the bag, it creates a certain rigidity in the production and does not allow an integrated manufacturing. Indeed, the complex is manufactured and printed and supplied in reel for shaping the bags. A manufacturing change requires a reel change which is a relatively heavy operation so that this technique is especially advantageous from the point of view of manufacture for manufacturing large quantities of identical bags.
But de l'invention Purpose of the invention
La présente invention a pour but de développer un sachet d'emballage de produits alimentaires simple à réaliser et économique, toutes 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 simple food packaging bag to produce and economic, all offering all the qualities of holding the bag for transporting and handling the packaged product.
L'invention a pour but de développer un sachet à, fenêtre qui soit de fabrication simple et économique et offre des possibilités de fabrications très souples permettant de changer facilement de fabrication de sachets différents par leur impression et/ ou leur fenêtre sur une même ligne de fabricatio en partant de matières premières identiques. Exposé et avantages de Pinventi n  The invention aims to develop a window bag that is simple and economical manufacturing and offers very flexible manufacturing opportunities to easily change the manufacture of different bags by their printing and / or their window on the same line of fabricatio starting from identical raw materials. Presentation and benefits of Pinventi n
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 est une nappe composite comprenant :  For this purpose, the subject of the present invention is a packaging bag of food products of the type defined above, characterized in that the sheet is a composite sheet comprising:
- un film transparent constituant l'intérieur du sachet,  a transparent film constituting the inside of the bag,
une bande de papier, longitudinale, collée au film pour couvrir extérieurement la nappe,  a strip of paper, longitudinal, glued to the film to cover the sheet externally,
- la bande de papier étant découpée pour réaliser la fenêtre et ensuite enduite de colle avant d'être appliquée sur le film transparent, the strip of paper being cut to make the window and then coated with glue before being applied to the transparent film,
- les deux côtés du sachet étant assemblés par le soudage du film. Dessiiis - Both sides of the bag being assembled by welding the film. Dessiiis
La présente invention sera décrite ci-après de manière plus détaillée à l'aide d'un exemple de sachet, à fenêtre et d'une installation de fabrication d'un tel sachet représentés dans les dessins annexés dans lesquels :  The present invention will be described hereinafter in more detail with the aid of an example of a bag, window and an installation for manufacturing such a bag shown in the accompanying drawings in which:
- la figure 1 est une vue de face d'un sachet à fenêtre mis à plat, FIG. 1 is a front view of a window bag set flat,
- la figure 1A est une vue en coupe très schématique du sachet de la figure 1 , FIG. 1A is a very schematic sectional view of the bag of FIG. 1,
- la figure 2 est un schéma montrant trois étapes du procédé de fabri- cation d'un sachet à fenêtre selon la figure 1 ,  FIG. 2 is a diagram showing three steps of the method of manufacturing a window bag according to FIG. 1;
- la figure 3 montre une installation de fabrication de sachet d'emballage tel que celui de la figure 1,  FIG. 3 shows a packaging bag manufacturing facility such as that of FIG. 1,
- la figure 4 montre schématiquement quatre vues en coupe transversale très schématique de la ligne de fabrication du sachet montrant quatre étapes de fabrication du sachet, à. fenêtre,  - Figure 4 shows schematically four views in very schematic cross section of the bag manufacturing line showing four stages of manufacture of the bag, to. window,
- la figure 5 montre en position développée et synthétique deux étapes de fabrication de sachet à fenêtre selon une variante du procédé.  FIG. 5 shows in the developed and synthetic position two window bag manufacturing steps according to a variant of the method.
Description de modes de réalisation de F inye ration  Description of embodiments of F inye ration
Pour faciliter la description, tant du sachet que de son procédé et de son installation de fabrication, il sera convenu d'appeler hauteur du sachet la mesure du sachet tenu en position verticale, avec son ouverture fermée ou non tournée vers le haut et sa partie inférieure ou bord replié situé en bas.  To facilitate the description, both of the bag and its process and its manufacturing facility, it will be agreed to call the height of the bag the measurement of the bag held in a vertical position, with its opening closed or not turned upwards and its part lower or folded edge located at the bottom.
La largeur du sac est la dimension de celui-ci entre ces deux bords latéraux.  The width of the bag is the dimension of it between these two lateral edges.
La direction suivant laquelle est dévidé le film recevant la bande de papier pour former la bande composite dans laquelle sont réalisés les sachets par pliage, soudage et découpe, en direction dite « longitudinale » (direction x). La largeur de la bande composite dans la direction y est la dimension du film dans la direction perpendiculaire.  The direction in which the film receiving the paper web is unwound to form the composite strip in which the bags are made by folding, welding and cutting, in the so-called "longitudinal" direction (x direction). The width of the composite strip in the y direction is the dimension of the film in the perpendicular direction.
Selon les figures 1 et 1A, le sachet à fenêtre 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 110 sont réalisées en repliant une nappe composite formée d'un film trans- parent 150 en matière plastique soudable constituant l'intérieur du sachet et portant extérieurement une bande de papier 200 qui couvre toute Sa face arrière 1 10 et la face avant 120, y compris la lèvre avant 121, représentée repliée, According to FIGS. 1 and 1A, the window 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 110 are made by folding a composite sheet formed of a transparent film. parent 150 of weldable plastic material constituting the inside of the bag and carrying on the outside a strip of paper 200 which covers all its rear face 1 10 and the front face 120, including the front lip 121, shown folded,
La face arrière 1 10 est pleine et la face avant 120 est munie d'une ou plusieurs fenêtres 125. La partie 210 de la bande de papier 200 qui couvre la face arrière 1 10 est pleine et revient par dessus la ligne de pliage 130 sur la face avant 120 avec sa partie avant 220 découpée formant la fenêtre 225 alors que le film transparent 150 couvrant la face intérieure du sachet, c'est-à-dire la face intérieure de la face arrière et de la face avant, est. continu sur toute la hauteur de la face arrière 1 10 et de la face avant 120. Ce film transparent 150 couvre également la lèvre arrière 1 1 1 dans le prolongement de la face arrière 1 10 et la lèvre avant 121 dans la position repliée avant utilisation et fermeture du sachet 100 dans l'état représenté à la figure 1. La découpe 225 de la fenêtre n'arrive pas jusqu'aux bords 101, 102 du sachet mais laisse un bord latéral avant la zone de soudure 101a, 102a des bords du sachet, pour participer à la rigidité de la face avant 120.  The rear face 1 10 is full and the front face 120 is provided with one or more windows 125. The portion 210 of the paper strip 200 which covers the rear face 1 10 is full and returns over the fold line 130 on the front face 120 with its cut front portion 220 forming the window 225 while the transparent film 150 covering the inner face of the bag, that is to say the inner face of the rear face and the front face, is. continuous over the entire height of the rear face 1 10 and the front face 120. This transparent film 150 also covers the rear lip 1 1 1 in the extension of the rear face 1 10 and the front lip 121 in the folded position before use and closing the bag 100 in the state shown in FIG. 1. The cutout 225 of the window does not reach the edges 101, 102 of the bag but leaves a lateral edge before the solder zone 101a, 102a of the edges of the bag. bag, to participate in the rigidity of the front face 120.
Dans le cas de l'exemple de la figure 1 , les bords 226, 227 de la fenêtre sont de même largeur, la fenêtre étant en position symétrique.  In the case of the example of Figure 1, the edges 226, 227 of the window are of the same width, the window being in symmetrical position.
Toutefois ces bords peuvent être de largeur différente suivant la forme de la fenêtre.  However, these edges may be of different width depending on the shape of the window.
La lèvre arrière 1 1 1 a de préférence un ou deux coins coupés ou tronqués 1 13 et elle est munie d'un cordon adhésif 112 occupant toute la largeur du sachet (c'est-à-dire la longueur de la lèvre 1 1 1). Ce cordon 1 12 est couvert par une bande protectrice 1 14, détachable, dépassant au niveau des coins coupés 11.3 de la lèvre arrière 1 1 1. Le film 150 qui apparaît sur la lèvre avant, repliée, est sans adhésif.  The rear lip 11 1 preferably has one or two cut or truncated corners 13 and is provided with an adhesive bead 112 occupying the entire width of the bag (i.e. the length of the lip 1 1 1 ). This cord January 12 is covered by a protective strip January 14, detachable, protruding at the cut corners 11.3 of the rear lip January 1. The film 150 which appears on the front lip, folded, is without adhesive.
Les deux côtés 101, 102 du sachet. 100 sont soudés par la soudure des bords respectifs du film 150 de la face avant et de la face arrière.  Both sides 101, 102 of the bag. 100 are welded by the welding of the respective edges of the film 150 of the front face and the rear face.
Pour simplifier la présentation et la description générale de l'invention, la fenêtre 125 a été présentée avec une découpe 225 dans la partie avant 220 de la bande de papier avec une forme sensiblement rectangulaire. Mais cette fenêtre peut avoir des formes très variables comme cela sera présenté dans la suite, La fonction de la fenêtre étant de permettre de voir la nature du contenu du sachet sans voir l'ensemble du contenu, cette fenêtre est de préférence réduite à une dimension relativement faible pour conserver au sachet toute sa rigidité et de sa tenue grâce à la rigidité du papier, ce qui permet de réduire l'épaisseur du film transparent assurant à la fois Fétanchéité du sachet et la visibilité à travers la fenêtre à une épaisseur minimale pour cette fonction puisque le film ne participe plus à la tenue du sachet. To simplify the presentation and the general description of the invention, the window 125 has been presented with a cutout 225 in the front portion 220 of the paper web with a substantially rectangular shape. But this window can have very variable forms as will be presented in the following, The function of the window being to allow to see the nature of the contents of the bag without seeing all the content, this window is preferably reduced to one dimension relatively low to keep the bag all its rigidity and strength due to the stiffness of the paper, which reduces the thickness of the transparent film ensuring both sealing of the bag and visibility through the window to a minimum thickness for this function since the film no longer participates in the holding of the bag.
Ce sachet 100 a une largeur £ et une hauteur hors tout H .  This bag 100 has a width £ and an overall height H.
La figure 2 montre trois étapes du procédé de fabrication du sachet de la figure 1 avec un film de matière plastique transparente soudable 150, défilant dans la direction (x) ainsi que d'une bande de papier 200 destinée à former la face extérieure du sachet et également dévidée dans la direction (x).  FIG. 2 shows three steps of the manufacturing process of the bag of FIG. 1 with a transparent film of solderable transparent plastic material 150 running in the direction (x) as well as a strip of paper 200 intended to form the outer face of the bag and also unwound in the direction (x).
L'assemblage des deux composants (150. 200) de la nappe composite 250 se fait en continu et les traits transversaux, interrompus, représentés dans les différentes parties de la figure 2, sont simplement des lignes théoriques qui délimitent un tronçon 260 de nappe composite 250 correspondant à un sachet d'emballage à la fin de la fabrication.  The assembly of the two components (150, 200) of the composite ply 250 is continuous and the interrupted transverse lines, represented in the different parts of FIG. 2, are merely theoretical lines delimiting a section 260 of composite ply. 250 corresponding to a packaging bag at the end of manufacture.
En fait, la figure 2 montre le traitement effectué sur la bande de papier seule en position retournée, c'est-à-dire montrant pour les besoins de rexplication dans les parties I et II, le dessous de la bande de papier 200, retournée.  In fact, FIG. 2 shows the treatment carried out on the paper strip alone in the upside-down position, ie showing for replication purposes in parts I and II, the underside of the paper strip 200, returned .
Au cours d'une première opération l, on dévide la bande de papier 200 qui a une largeur (t) dans la direction (y) correspondant au double de la hauteur H d'un sachet 100 ; le trait représenté au milieu est en fait à la fois l'axe de symétrie et la future ligne de pliage 230 de la nappe composite 250 pour former le sachet 100.  During a first operation l, the paper web 200 is unwound which has a width (t) in the direction (y) corresponding to twice the height H of a bag 100; the line represented in the middle is in fact both the axis of symmetry and the future fold line 230 of the composite web 250 to form the bag 100.
Après avoir réalisé la découpe 225 de la fenêtre (I), la bande de papier 200 passe dans un poste d'enduction de colle (II). Ce poste d'enduction applique une surface de colle représentée en trait moucheté 240, 241. Cette enduction de colle, de préférence soluble dans de l'eau, est appliquée sur la surface correspondant, à la partie arrière 210 du papier du sachet et en bordure de la découpe 225 de la fenêtre et en bordure du contour de la face avant 220, y compris la lèvre avant non représentée dans cette étape du procédé. After making the cutout 225 of the window (I), the paper web 200 passes into an adhesive coating station (II). This coating station applies a glue surface represented in a line speckled 240, 241. This glue coating, preferably soluble in water, is applied to the corresponding surface, the rear portion 210 of the paper bag and edge of the cutout 225 of the window and edge of the outline of the front face 220, including the front lip not shown in this step of the method.
Pour la partie arrière 210, l'enduction de colle peut également se limiter au contour et à quelques points à l'intérieur du contour.  For the rear portion 210, the glue coating may also be limited to the outline and a few points within the contour.
Ensuite, dans la troisième étape (III), on applique la bande de papier découpée et encollée 200, représentée ici dans sa position normale (non retournée), face extérieure tournée vers le dessus, sur le film transparent 150 dévidé par ailleurs.  Then, in the third step (III), applying the strip of paper cut and glued 200, shown here in its normal position (not returned), outer face facing upwards, on the transparent film 150 unwound elsewhere.
Comme la colle est une colle à l'eau qui humidifie la face intérieure de la nappe de papier 200, celle-ci peut être appliquée directement sur le film de matière plastique soudable 150 pour coller ces deux composants et former la nappe composite 250. Cette nappe composite 250 continue de défiler dans la direction (x) pour plier par exemple la lèvre de la face avant et les deux parties formant la face avant et la face arrière autour de la ligne de pliage 230 correspondant comme indiqué ci-dessus à la ligne de symétrie ou ligne d'axe tracée à la figure 2.  Since the glue is a water-based adhesive that moistens the inner face of the paper web 200, it can be applied directly to the solderable plastic film 150 to glue these two components together and form the composite web 250. composite web 250 continues to scroll in the direction (x) to fold for example the lip of the front face and the two parts forming the front face and the rear face around the fold line 230 corresponding as indicated above to the line of symmetry or axis line drawn in Figure 2.
Après ce pliage, la face avant 120 et la face arrière 110 sont appliquées l'une contre l'autre et on peut alors souder les bords non encore coupés suivant les lignes transversales en pointillés.  After this folding, the front face 120 and the rear face 110 are applied against each other and can then be welded edges not yet cut along the dotted lines.
Après la soudure, les différents tronçons 260 correspondant chaque fois à un sachet d'emballage à fenêtre 100 peuvent être coupés le long de leurs côtés (verticaux/ transversaux) (101. 102).  After the welding, the different sections 260 corresponding each time to a window packaging bag 100 can be cut along their sides (vertical / transverse) (101, 102).
L'application de colle sur la lèvre arrière se fait par une étape du procédé en continu, consistant à appliquer un cordon d'adhésif 1 12 sur le film au niveau de la lèvre 110 de la face arrière et ensuite dévider sur ce ruban de colle, un ruban protecteur 114 détachable. Les coins supérieurs de la lèvre de la face arrière sont de préférence découpés dans la nappe composite 250 avant l'application du ruban de colle ou après celle-ci mais avant la mise en place du ruban protecteur du cordon d'adhésif puisque celui-ci doit dépasser au niveau des coins tronqués, The application of glue on the rear lip is done by a step of the continuous process, consisting of applying a bead of adhesive January 12 to the film at the lip 110 of the rear face and then unwind on this tape of glue a protective tape 114 detachable. The upper corners of the lip of the rear face are preferably cut in the composite web 250 before the application of the adhesive tape or after it but before the introduction of the ribbon protector adhesive bead since it must exceed the level of truncated corners,
La figure 3 montre schéma tiquement une installation pour la fabrication de sachets à fenêtre 100 tels que ceux décrits ci- dessus.  Figure 3 schematically shows an installation for the manufacture of window bags 100 such as those described above.
La ligne de fabrication se compose d'une alimentation en film 300 qui dévide le film et d'une alimentation en papier 350 qui dévide également la bande de papier 200. Alors que le film 150 est dévidé sans subir de traitement particulier, la hande de papier 200 est tout d'abord découpée dans un dispositif de découpe 351 pour réaliser les découpes 225 des fenêtres successives puis la surface « intérieure » de la bande de papier est enduite de colle dans un dispositif d'enduction 352. de préférence avant qu'elle ne passe sur le rouleau de guidage 353 qui conduit la bande de papier découpée et encollée sur le dessus du film 150. Ensuite, la nappe composite 250 est pressée pour conforter le collage puis la lèvre supérieure est repliée et la face avant et la face arrière sont repliées l'une sur l'autre puis l'ébauche de sachet ainsi replié est souciée le long de ses deux bords pour être ensuite coupée par tronçons, les sachets étant terminés. Les opérations sont faites dans différents postes 301 , 302 non détaillés.  The production line consists of a film feed 300 which unwinds the film and a paper feed 350 which also unwinds the paper web 200. While the film 150 is unwound without undergoing any particular treatment, the hand of paper 200 is first cut in a cutting device 351 to make the cuts 225 of the successive windows and then the "inner" surface of the paper web is coated with glue in a coating device 352. preferably before it does not pass on the guide roll 353 which drives the strip of paper cut and glued on the top of the film 150. Next, the composite web 250 is pressed to reinforce the gluing, then the upper lip is folded and the front face and the face The back are folded over one another and then the pouch blank and folded is cared along its two edges to be then cut in sections, the bags being completed. The operations are made in different positions 301, 302 not detailed.
Les opérations intercalaires comme celles décrites ci- dessus, c'est-à-dire la découpe des coins de la lèvre arrière, l'enduction de colle et la mise en place du ruban protecteur se font avant ou après les soudures transversales mais avant la découpe finale des sachets.  Intercalary operations such as those described above, that is to say the cutting of the corners of the rear lip, the coating of glue and the introduction of the protective tape are made before or after the transverse welds but before the final cut of the bags.
Dans le cas de la bande de papier 200, avant la découpe dans le dispositif 351 , elle peut recevoir une impression dans un groupe d'impression 354,  In the case of the paper web 200, before cutting in the device 351, it can receive an impression in a printing unit 354,
La figure 4 montre, dans ses quatre parties (I-ÎV), différentes coupes transversales schématiques de la fabrication d'un sachet de papier partant de la partie ï qui est une coupe transversale schématique de la bande de papier 200 qui est ensuite découpée (partie II) pour former la fenêtre et encoller la face intérieure de la bande de papier puis cette bande de papier est réunie au film 150 (III). Ensuite, dans une quatrième étape (IV), la lèvre avant 121 est repliée et dans la cinquième étape, la face avant 120 et la face arrière 1 10 sont repliées suivant le pli 130 l'une contre l'autre. FIG. 4 shows, in its four parts (I-IV), various schematic cross-sections of the manufacture of a paper bag starting from the part which is a schematic cross section of the paper strip 200 which is then cut ( Part II) to form the window and glue the inner face of the paper web and then this paper web is joined to the film 150 (III). Then, in a fourth step (IV), the front lip 121 is folded and in the fifth step, the front face 120 and the rear face 1 10 are folded in fold 130 against each other.
La figure 5 montre schématiquement la réalisation en pa- rallèle de deux sachets 100, 100A avec une nappe composite 250A de largeur double de celle des figures précédentes. Les opérations ainsi décrites se font simultanément et de façon symétrique par rapport à l'axe de défilement DD (parallèle ), Les figures présentées montrent en fait les côtés intérieurs des faces avant de deux sachets 100, 100A mettant en évidence les surfaces encollées, symétriques et la deuxième partie de la figure montre la face avant de deux sachets jumelés correspondant à un tronçon 260A de la nappe composite 250A façonnée, avant la découpe longitudinale séparant les deux sachets l'un de l'autre et la découpe transversale séparant le sachet amont par rapport au sa- chet aval,  FIG. 5 schematically shows the parallel production of two bags 100, 100A with a composite web 250A with a width twice that of the preceding figures. The operations thus described are simultaneously and symmetrically with respect to the axis of movement DD (parallel). The figures presented in fact show the inner sides of the front faces of two bags 100, 100A highlighting the glued, symmetrical surfaces. and the second part of the figure shows the front face of two paired bags corresponding to a section 260A of the shaped composite sheet 250A, before the longitudinal cut separating the two bags from one another and the transverse cut-out separating the upstream bag. compared to the downstream trap,
Lci fi gure 6, dans les parties ï, II, III, montre différentes variantes de fenêtres 125 B,C,D pour des sachets 100 B, C, D,  Figure 6, in parts I, II, III, shows different window variants 125 B, C, D for bags 100 B, C, D,
Alors que la fenêtre des sachets des figures précédentes est une fenêtre d'une certaine importance occupant une partie impor- tante de la largeur du sachet et aussi de sa hauteur, il est possible de réaliser des sachets avec des fenêtres plus petites ou plusieurs fenêtres ou encore des fenêtres correspondant par exemple à la silhouette d'un logo de produit ou de service ou de vente.  While the window of the bags of the preceding figures is a window of some importance occupying a large part of the width of the bag and also of its height, it is possible to produce bags with smaller windows or more windows or still windows corresponding for example to the silhouette of a logo of product or service or sale.
Cette forme de fenêtre a l'avantage de réduire la surface du sachet simplement couverte par le film de sorte que la rigidité est assurée principalement par le papier, ce qui permet de réduire l'épaisseur du film utilisé et ainsi le coût du sachet. This form of window has the advantage of reducing the surface of the bag simply covered by the film so that the rigidity is provided mainly by the paper, which reduces the thickness of the film used and thus the cost of the bag.
NOMENCLATURE NOMENCLATURE
100, 100A,B>C,D Sachet à fenêtre 100, 100A, B > C, D Window bag
101, 102 Côté du sachet  101, 102 Side of the bag
101a, 102a Bande soudée  101a, 102a Welded strip
103 Bord inférieur plié  103 folded lower edge
110 Face arrière  110 Back side
111 Lèvre arrière  111 Rear lip
112 Cordon adhésif  112 Adhesive cord
113 Coin(s) tronqué(s)/ coins coupés 113 Truncated corner (s) / cut corners
114 Ruban protecteur amovible 114 Removable protective tape
120 Face avant  120 Front face
121 Lèvre avant (repliée)  121 Front lip (folded)
125A,B D Fenêtre  125A, B D Window
130 Pli  130 Fold
13o Côté(s) soudé(s)  13o Welded side (s)
150 Film transparent  150 Transparent film
200 Bande de papier  200 Paper tape
210 Partie arrière  210 Rear section
220 Partie avant  220 Front part
225 Découpe de la fenêtre  225 Cutting the window
226 Bord latéral bordant la découpe 227 226 Side edge bordering the cutout 227
227 Bord latéral bordant la découpe227 Side edge bordering the cutout
230 Ligne de pliage 230 Folding line
240, 241 Surfaces/ lignes encollées  240, 241 Surfaces / glued lines
250, 250A Nappe composite  250, 250A Composite tablecloth
260, 260A Tronçon de la nappe composite  260, 260A Section of composite ply

Claims

R E V E N D I C A I O N S  R E V E N D I C A I O N S
1°) Sachet d'emballage de produits alimentaires, préformé, composé d'une face avant (120) et d'une face arrière (1 10), formées à partir d'une nappe repliée pour former le bord inférieur (103) du sachet (100) dont le bord supérieur constitue l'ouverture avec une lèvre (1 1 1) bordant la face arrière (1 10) et une lèvre (121) bordant la face (120) avant destinées à être reliées Tune à l'autre pour fermer le sachet, 1) preformed food packaging bag consisting of a front face (120) and a rear face (1 10), formed from a ply folded to form the lower edge (103) of the bag (100) whose upper edge constitutes the opening with a lip (1 1 1) bordering the rear face (1 10) and a lip (121) bordering the front face (120) intended to be connected to each other to close the bag,
la nappe repliée étant soudée sur les deux bords reliant la face arrière à la face avant, the folded sheet being welded to the two edges connecting 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, · ■ a transparent film (150) forming, inside the bag,
- une bande de papier (200), longitudinale, collée au film (150) pour couvrir extérieurement la nappe,  a paper strip (200), longitudinal, glued to the film (150) to cover the sheet externally,
- la bande de papier (200) étant découpée (225) pour réaliser la fenêtre (125) et ensuite enduite de colle avant d'être appliquée sur le film transparent (150), the paper strip (200) being cut (225) to produce the window (125) and then coated with glue before being applied to the transparent film (150),
- les deux côtés (101, 102) du sachet (100) étant assemblés par le soudage (101a, 102a) du film (150),  the two sides (101, 102) of the bag (100) being assembled by the welding (101a, 102a) of the film (150),
2°) Sachet d'emballage selon la revendication 1, 2) Packaging bag according to claim 1,
caractérisé en ce que characterized in that
les bords de la découpe (225) de la fenêtre (125) laissent au moins un bord latéral (226, 227) bordant la découpe (225), subsistant au-delà de la bande soudée (101a, 102a). the edges of the cutout (225) of the window (125) leave at least one side edge (226, 227) bordering the cutout (225), remaining beyond the welded strip (101a, 102a).
3°) Sachet d'emballage selo la revendication 1, 3 °) packaging bag according to claim 1,
caractérisé en ce que characterized in that
la fenêtre (125) a la forme d'un logo ou d'un sigle. the window (125) is in the form of a logo or an acronym.
4°) Sachet d'emballage selon la revendication 1, 4 °) packaging bag according to claim 1,
caractérisé en ce que characterized in that
la lèvre arrière (1 1 1) est à coin(s) tronqué(s) (1 13) et. porte un cordon d'adhésif (1 12) couvert par un ruban protecteur amovible (1 14). 5°) Procédé de fabrication d'un sachet d'emballage de produits alimentaires selon l'une quelconque des revendications 1 à 4, the rear lip (1 1 1) has truncated corner (s) (1 13) and. carries a bead of adhesive (1 12) covered by a removable protective tape (1 14). 5 °) A method of manufacturing a food packaging bag according to any one of claims 1 to 4,
caractérisé en ce qu' characterized in that
- on dévide un film transparent soudable (150) de largeur sensible- ment égale à la hauteur développée (2H) du sachet (100),  a solderable transparent film (150) of width substantially equal to the developed height (2H) of the bag (100) is unwound,
- on dévide une bande de papier (200) de largeur (£) sensiblement égale à la hauteur développée (2H) du sachet,  a paper strip (200) of width ()) substantially equal to the developed height (2H) of the bag is unwound,
- on découpe les fenêtres (225, 125) dans la bande de papier (200), the windows (225, 125) are cut in the paper web (200),
- on enduit de colle la bande de papier découpée (200), the glued paper web (200) is coated with glue,
- on applique la bande de papier découpée (200), enduite de colle sur le film transparent (150) pour coller et obtenir une bande composite (250), the strip of cut paper (200) coated with adhesive on the transparent film (150) is applied to bond and obtain a composite strip (250),
- on façonne la bande composite (250) pour la plier réalisant le pli de la lèvre avant, le pli (130) du fond (103) du sachet,  the composite strip (250) is shaped so as to fold it, making the fold of the front lip, the fold (130) of the bottom (103) of the bag,
- on soude transversalement (101a, 102a) la bande composite (250) pour former et fermer les côtés (101 , 102) du sachet (100), the composite web (250) is welded transversely (101a, 102a) to form and close the sides (101, 102) of the bag (100),
- on découpe dans la bande composite façonnée (250), les sachets soudés pour les séparer. 6°) Procédé de fabrication d'un sachet d'emballage de produits alimentaires selon la revendication 5,  the welded bags are cut in the shaped composite strip (250) to separate them. 6 °) A method of manufacturing a food packaging bag according to claim 5,
caractérisé en ce qu' characterized in that
on plie en continu la nappe composite (250), on soude les bords des tronçons pour former les sachets et on coupe les sachets (100) pour les séparer de la nappe composite (250), the composite ply (250) is continuously folded, the edges of the sections are welded to form the bags and the bags (100) are cut to separate them from the composite ply (250),
7°) Procédé de fabrication d'un sachet d'emballage de produits alimentaires selon la revendication 5, 7 °) A method of manufacturing a food packaging bag according to claim 5,
caractérisé en ce qu' characterized in that
on enduit la face intérieure de la bande de papier (200) d'une colle à l'eau qui humidifie la bande de papier pour permettre son application directement sur le film transparent (150). the inner face of the paper web (200) is coated with a water-based adhesive which moistens the paper web to allow its application directly onto the transparent film (150).
8°) Procédé de fabrication d'un sachet d'emballage de produits alimen- taire s selon la revendication 5, caractérisé en ce qu' 8 °) A method of manufacturing a food product packaging bag according to claim 5, characterized in that
on réalise une bande composite (250A) ayant une largeur double de la hauteur développée (2H) d'un sachet (100, 100A) en dédoublant les opérations de découpe et d'encollage selon la revendication 5 pour façonner simultanément, en parallèle, deux sachets (100, 100A) par tronçon (260A) de bande composite (250A), les sachets étant sur la bande dans des positions symétriques par rapport à Taxe médian (DD) de la bande composite (250A). 9°) Procédé de fabrication d'un sachet d'emballage de produits alimentaires selon la revendication 5, a composite web (250A) having a double width of the developed height (2H) of a bag (100, 100A) is produced by splitting the cutting and gluing operations according to claim 5 to simultaneously form, in parallel, two sachets (100, 100A) per section (260A) of composite web (250A), the pouches being on the web in positions symmetrical with respect to the median tax (DD) of the composite web (250A). 9 °) A method of manufacturing a food packaging bag according to claim 5,
caractérisé en ce qu' characterized in that
on enduit de colle une surface limitée du papier sur chaque tronçon (250, 250A) correspondant à un sachet (100, 100A), glueing a limited surface of the paper on each section (250, 250A) corresponding to a bag (100, 100A),
10°) Procédé de fabrication d'un sachet, d'emballage de produits alimentaires selon la revendication 9, 10 °) A method of manufacturing a bag, packaging food products according to claim 9,
caractérisé en ce qu' characterized in that
on enduit la bande de papier (200) de colle de façon limitée autour des découpes (225) de la fenêtre et du contour de la face avant (120) et de la face arrière (1 10) ainsi qu'au niveau du pli (130), au niveau de la lèvre arrière (1 1 1) et de la lèvre avant (121) ainsi que dans des points intermédiaires à l'intérieur du contour de la face arrière ( 10). 1 1°) Installation de fabrication d'un sachet d'emballage de produits alimentaires selon les revendications 1 à 4 appliquant le procédé de fabrication selon les revendications 5 à 10, caractérisée en ce qu'elle comporte une installation d'alimentation en film transparent soudable (300), une installation d'alimentation papier (350), une ligne de prépara- tion du papier avec un groupe d'impression (354) suivie d'un dispositif de découpe de la fenêtre (251) et d'un dispositif d'enduction de colle (252) ainsi qu'un moyen pour conduire la bande de papier (200) ainsi préparée sur le film (150) dévidé par l'installation (300) pour coller la bande de papier au film et former une nappe composite, ainsi qu'une installation d'assemblage de la bande de papier et du film puis le pliage de la I re avant et de la f ce avant par rapport à la face arrière ais 3e Otidage r nsversal pmit réaliser les bords des sachets et de découpe de sachets de a nappe composite ainsi iaçormée (301, 302) > the paper web (200) is coated in a limited manner around the cutouts (225) of the window and the contour of the front face (120) and the rear face (1 10) as well as at the level of the fold ( 130), at the rear lip (1 1 1) and the front lip (121) and at intermediate points within the contour of the rear face (10). 1 1) Apparatus for manufacturing a food packaging bag according to claims 1 to 4 applying the manufacturing method according to claims 5 to 10, characterized in that it comprises a transparent film feed system weldable material (300), a paper feed (350), a paper preparation line with a printing unit (354) followed by a window cutter (251) and a device adhesive coating (252) as well as means for driving the paper web (200) thus prepared on the film (150) unwound from the installation (300) to bond the paper web to the film and form a web composite, as well as an assembly facility of the paper tape and the film then the folding the front and the front of the front panel with respect to the rear panel; and the third embodiment of the present invention for making the edges of the sachets and for cutting the composite web bags thus formed (301, 302).
PCT/FR2014/051533 2013-07-03 2014-06-20 Packaging bag having a window WO2015001220A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1356512 2013-07-03
FR1356512A FR3008076B1 (en) 2013-07-03 2013-07-03 WINDOW PACKAGING BAG

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Publication Number Publication Date
WO2015001220A1 true WO2015001220A1 (en) 2015-01-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2014/051533 WO2015001220A1 (en) 2013-07-03 2014-06-20 Packaging bag having a window

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108481818A (en) * 2018-03-26 2018-09-04 涿州皓原箔业有限公司 A kind of heatproof transparency window aluminium foil bag and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2158755A (en) * 1936-09-16 1939-05-16 Theodore A Hodgdon Laminated sheet material for use in making paper bags or wrappers
US3983794A (en) * 1973-10-19 1976-10-05 Robert Bosch G.M.B.H. Multistep transverse welding process for producing bags from plastic sheets
EP2116476A1 (en) * 2008-05-06 2009-11-11 Alpem Preformed packaging bag, in particular for food products

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2158755A (en) * 1936-09-16 1939-05-16 Theodore A Hodgdon Laminated sheet material for use in making paper bags or wrappers
US3983794A (en) * 1973-10-19 1976-10-05 Robert Bosch G.M.B.H. Multistep transverse welding process for producing bags from plastic sheets
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
CN108481818A (en) * 2018-03-26 2018-09-04 涿州皓原箔业有限公司 A kind of heatproof transparency window aluminium foil bag and preparation method thereof

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FR3008076B1 (en) 2015-08-21

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