FR2848190A1 - Bag for carrying objects, has panels stratified in thickness and formed by superimposition of external and internal films, and sheet with visual motifs inserted between two films in one main panel, where film is translucid - Google Patents

Abstract

The bag has panels (4) stratified in thickness and formed by superimposition of external and internal films from exterior towards interior of the bag. Surfaces contacting the films are free between them, and the films are connected along upper edges of two main panels. A sheet with visual motifs on its surface is inserted between the two films in one of the main panels, where the film is translucid. Bottom (3) of the bag is linked by the outer film along lower edges of the panels. An Independent claim is also included for a method of manufacturing a stratified bag.

Description

The present invention relates to a laminated bag intended for

  transporting objects, as well as a method for producing said bag. The bag is essentially utilitarian and has a structure with superimposition of two films sandwiching a printed sheet 5 visible from the outside of the bag and also allowing aesthetic and / or commercial presentations. The invention therefore has applications in particular in retail or mass trade and whenever it is necessary to transport one or more objects in a bag.

  The bags intended to transport consumer goods after purchase have experienced a great development linked to the extension of household consumption. They come in many forms, the general trend however being a search for reduced cost. Thus, in large-scale distribution, there are flexible plastic bags made from a tubular plastic film and of which a first end is welded to form handles and a second to form a bag bottom. These bags are mass produced and do not allow their commercial origins to be differentiated in an efficient manner in the eyes of consumers other than by printing texts on the film. However, even this impression is not particularly attractive because it is generally masked or rendered incomprehensible by the fact that the film is very flexible and that the bag easily crumples with folds and folds. In order to stand out from the mass market image attached to this type of bag, bags have been produced to give a more specific image of the distributor or trader (for example "ecological" paper and / or recycled bag) and / or to give certain other advantages to the consumer (for example an insulating or insulated bag).

  The object of the invention is to provide a bag which makes it possible to display printed patterns which remain visible under normal conditions of use of the bag and which differs from traditional bags both from an aesthetic and functional point of view while being an implementation cost acceptable in view of these objectives. In general, the bag of the invention is laminated and corresponds in a substantially simplified manner to an assembly of two pouches or simple bags which are substantially identical and are freely inserted one into the other in the same direction of opening, the outer bag being translucent or transparent and a sheet with visual patterns being inserted freely between the two to be visible from the outside. These three elements are free from each other with the exception of lines for securing the bags 10 to one another, in particular along at least part of their upper edges along the opening of the bag. In a variant, the two bags can also be joined together on the bottom. Many variants are possible with regard to the structures of the bottom, of the opening and of the associated gripping means.

  The invention therefore relates to a bag formed by a first main panel, a second main panel and two side panels, the side edges of said panels being in continuity and the bottom edges of said panels being joined together to close the bag. and forming a bag bottom, the upper edges of said panels delimiting an access opening inside the bag, gripping means being further disposed towards the upper ends of the main panels. According to the invention, the panels are laminated in thickness, the panels being formed from the superposition of the exterior towards the interior of the bag of an exterior film and an interior film, the surfaces in contact correspondence of said films being essentially free from each other, the outer film and the inner film being joined together along the upper edges of the panels at least along the upper edge of the first main panel and along the upper edge of the second main panel, the bottom of the bag being closed by joining at least the outer film along its lower edges of panels and at least in one of the two main panels is inserted, between the two films, a sheet with visual patterns on at least the surface of the sheet oriented towards the outside of the bag, the outer film being at least translucent in order to make visible from the outside of the bag the visual patterns, the surfaces of the fire ille and 5 of the films in contact correspondence being essentially free between them.

  In the context of the invention, the term "essentially" relating to the freedom of the surfaces of the films and of the sheet means that these elements are simply placed against each other without being secured to almost all of their contact surfaces ( almost all given the lines of attachment to the upper edges, even lower, or even along the folds of bellows). The terms "at least translucent" for the outer film mean that the film can be translucent or transparent as alternatives or that translucency and transparency can be combined in different surface areas of the film. This quality of the film is intended to make the visual patterns of the sheet visible from the outside of the bag, so it is the film outside at least of the main panels which exhibits this characteristic of translucency or, better, of transparency.

  The outer film of the side panels although preferably having the same optical quality as that of the main panels may, however, in alternatives, have other qualities including opacity.

  In various embodiments of the invention, the following means can be used alone or in any technically conceivable combination, are used

- GENERAL STRUCTURE

  - the joining corresponds to one or more of the following methods: cold bonding, hot bonding, ultrasonic welding, hot welding, stapling, sewing or clipping, - preferably, the bonding is carried out by heat sealing in the case of placing in the use of heat-sealable plastics for films, - each side panel comprises at least one bellows, - preferably, a side panel comprises only one bellows, - the bellows of the inner film is secured to the bellows of the corresponding outer film along from the center fold line of the bellows, - the main panels each include a sheet with visual patterns inserted between the two films of the panel, - the sheet with visual patterns of each of the main panels is a single continuous sheet from the first panel main, passing through the bottom of the bag and up to the second main panel 10, the inner film is translucent, transparent or opaque or, again, a combination of these characteristics, - the inner film is preferably opaque, in particular by mass dyeing, - the film is obtained from a sheath of the tubular segment type with two opposite openings, one of the openings being intended to form the access opening inside the bag and the other opening being in relation to the bottom of the bag, - the film is obtained from a tracing paper shaped with creasing, then folding the along the crease lines and lateral closure, - the film is made of low density polyethylene with a thickness between 20pm and 150pm and preferably about 60pm, - the outer film is preferably made of low density polyethylene, - the film is in high density polyethylene with a thickness between 20pm and 100pm and preferably around 100lm, - the inner film is preferably in high density polyethylene, - the film is in polypropylene with a thick sor between 30 20pm and 150pm and preferably about 60pm, - the film is in tracing paper with a grammage between 80g / m2 and 250g / m2 and preferably about 120g / m2, - the film is in a material chosen from the preceding materials, - the film is made from a material which is preferably heat-weldable, - the sheet with visual patterns is made from a material chosen from paper, cardboard, fabric, a plastic material, - the sheet with patterns visuals is preferably made of paper or cardboard, - the sheet with visual patterns of paper or cardboard has a coating in a heat-weldable material, - FOND. as regards more particularly the bottom, at the lower part of the bag: - the lower edges of the inner film of the panels are joined together while being free relative to the outer film of the panels, the bottom of the bag being closed, d on the one hand, by securing the lower edges of the outer film of the panels and, on the other hand, independently, by securing the lower edges of the inner film of the panels, the bag thus having two independent closed bottoms superimposed, - in the case o the sheet with visual patterns is not continuous from one main panel to another, the lower edges of the exterior and interior films of the panels are joined together to form a common single closed bottom, - the bottom edges of the interior film panels are not secured to each other, the bottom of the bag being closed by the sole attachment of the lower edges of the outer film of the panels,

- POINTED BACKGROUND

  - the bag is fully pointed, - the bag is fully pointed, the lower edges of the panels are joined together along a bottom line, the side panels having bellows in the folded position along said line of bottom, - the joining along the bottom line concerns at least the outer film, - the inner film remains open at its bottom end, - the inner film is closed at the bottom by joining its lower edges, - the closures of bottom by securing the lower edges of the outer and inner film are independent, - the bag has a common bottom closure by joint securing of the lower edges of the outer and inner film,

- FLAT BOTTOM

  - the bag is flat-bottomed, the lower edges of the panels being joined together along a bottom line, the side panels having bellows in the unfolded position along said bottom line, the lower part of the panels of the bag comprising folds allowing, when the bag is stored empty, the folding of the flat bottom substantially parallel and against a main panel and, when the bag is in the position of use, the folding of the flat bottom substantially perpendicular to the 15 main panels, - the securing along the bottom line concerns at least the outer film, - the inner film remains open at its bottom end, - the inner film is closed at the bottom by securing its lower edges, - the bottom closings by securing lower edges of the outer and inner film are independent, - the bag has a common bottom closure by joint securing of the edges i of the outer and inner film, - in addition a substantially rigid bottom plate is arranged at the bottom of the bag in order to reinforce a flat bottom, - the bottom plate is secured to at least one of the films, - in the case of a bag, the lower edges of the two films 30 are secured for common or independent closure, as the case may be: - the bottom plate is between the two films, sandwiched, - the bottom plate is between the two films, sandwiched, on the side of the inner film in case the sheet with visual patterns is continuous, - the bottom plate is inside and at the bottom of the bag, on the side of the face of the inner film oriented towards the inside of the bag, - in the case of a bag of which only the outer film forms a closed bottom, the inner film having no bottom - the bottom plate is against the outer film inside the bag,

- BAG OPENING

  * as regards more particularly the opening of the bag at its upper part: - in addition, along the upper edges of the films of a main panel, the sheet with visual patterns is secured to the two films, the sheet being in sandwich between the exterior and interior films along their upper edges joined together, 15 - OPENINGSThe gripping means is an opening allowing the passage of the fingers and the palm of one hand, produced in the upper part of each main panel and passing through the outer film, the sheet with visual patterns and the corresponding inner film, - the films and sheets are joined together around the periphery of each of the openings in order to form a reinforcement around each opening, - the upper end of the bag includes reinforcing means of the type of substantially rigid reinforcing plates secured on the inner surface of the inner film bag, each of s main panels comprising a reinforcement plate secured along the upper edge of the inner film, - when reinforcement means of the type of substantially rigid reinforcement plates are used, the opening also passes through the plate, - the plate reinforcement is also secured to the inner film around the periphery of the opening, - the upper end of the bag comprises reinforcing means of the type of folds towards the inside of the bag of the upper ends of each of the panels, - when reinforcing means of the fold type are used, the main panels have additional complementary openings and in correspondence with the openings made in the upper part of each main panel and which are then located on a fold, the upper end of the bag includes: - reinforcement means of the type of substantially rigid reinforcement plates secured to the internal surface of the s ac of the inner film, each of the main panels comprising a reinforcing plate fixed at least along the upper edge of the inner film, the opening also passing through the plate, - reinforcement means of the type of folds towards the interior of the bag of the upper ends of each of the panels, the main panels having additional additional openings and in correspondence with the openings made in the upper part of each main panel and which are then on a fold,

- HANDLES

  the gripping means is a pair of handles, each handle formed by a handle attached to a strip of material being secured along the upper edge of a main panel by the strip of material, each handle of a pair comprises attachment means complementary to those of the other handle of the pair in order to have a removable closure system for the access opening inside the bag, the strip of material of the handle is secured to the panel on the inner surface of the inner film bag,

- CORDLETTES

  - The gripping means is a pair of cords with knotted ends for blocking and forming handles, each cord being passed through at least two orifices towards the upper end of a main panel passing through the outer film, the sheet with visual patterns and the corresponding inner film, - the films and sheets are secured together around the periphery of each of the orifices in order to form a reinforcement around each orifice, - a metal eyelet is secured around the periphery of each of the orifices in order to form a reinforcement around each orifice, the upper end of the bag comprises reinforcement means of the type of substantially rigid reinforcing plates 15 secured to the inner surface of the inner film bag, each of the main panels comprising a reinforcing plate secured along the upper edge of the inner film, - when reinforcing means such as reinforcing plates sen if rigidly implemented, the two orifices 20 for the passage of a cord also pass through the plate, the upper end of the bag includes reinforcement means of the type of inward folds of the bag from the upper ends of each of the panels, when reinforcement means of the fold type are used, the two orifices of a cord then being on the fold towards the inside of the bag, each cord also passes through two other orifices of the corresponding main panel and in correspondence with the two orifices of the fold, - the upper end of the bag comprises - reinforcing means of the type of substantially rigid reinforcing plates secured on the internal surface of the bag of the inner film, each of the main panels comprising a reinforcing plate fixed along the upper edge of the inner film, the two passage openings 35 of a cord further passing through the plate, - mo reinforcement yen of the type of folds towards the inside of the bag of the upper ends of each of the panels, the two orifices then being on the fold towards the inside of the bag and each cord also passing through two other holes of the main panel corresponding and in correspondence with the two orifices of the fold, - the reinforcing or bottom plates are made of a material chosen from cardboard, plastics, - the reinforcing or bottom plates are preferably made of cardboard, - the cardboard preferably have a coating in a heat-sealable material.

  The invention also relates to a method of producing a bag according to one or more of the preceding characteristics and which is a bag formed by a first main panel, a second main panel and two side panels, the edges lateral of said panels being in continuity and the lower edges of said panels being joined together to close the bag and form a bag bottom, the upper edges of said panels defining an access opening inside the bag, gripping means being further disposed toward the upper ends of the main panels.

  According to the method, in order to obtain the bag: - panels have been produced which are laminated in thickness 25 by fitting an inner film into an outer film, the surfaces in contact with said films being essentially free from each other, - the outer film and the inner film are joined together along the upper edges of the panels at least along the upper edge of the first main panel and along the upper edge of the second main panel, - the bottom of the bag is closed by joining at least the outer film along its lower edges of panels, - between the two films of at least one of the two main panels has been inserted a sheet with visual patterns on at least the surface oriented towards the exterior of the bag, the exterior film being at least translucent in order to make the patterns visible from the exterior of the bag, the surfaces of the sheet and films in contact correspondence being e essentially free from each other. In variants of the method, a sheath of the tubular segment type with two opposite openings is used for the film, one of the openings being intended to form the access opening inside the bag and the other opening being in relation with the bottom 10 of the bag.

  It is understood that the preceding process can be declined according to execution methods in relation to one or more of the structural characteristics previously listed.

  The visual patterns of the sheet, preferably paper or cardboard, are preferably printed. The sheet is intended to be inserted in a main panel and its size is therefore adapted to that of said panel, the size of the sheet corresponds substantially to that of the main panel and in practice it can be slightly smaller in size, in particular in width. 20 laterally. In the case of a single sheet for the two main panels, the depth of the bottom will be taken into account to determine the total length of said single sheet.

  The printing of the patterns, in particular in the case of sheets of paper or cardboard, can be carried out at reduced cost in a conventional printing press 25 which makes it possible to obtain small series of bags easily adapted to the particular needs of the customers.

  On the other hand, the general presentation of the bags is particularly attractive and gives an impression of robustness and security which is effectively obtained by the use of the laminated structure which can make it possible to obtain a double bottom or a bottom. common.

  In other applications one can envisage visual patterns resulting from artistic activities, engraving, painting, watercolors ... and the outer film is at least translucent and at best transparent over at least most of its surface in relation with the sheet so that its patterns are visible from the outside of the bag. In parts of the outer film not related to patterns of the sheet which must be visible and / or on the side panels, an opacity of the outer film is envisaged, either uniform or of its own pattern. An example of the latter case is a representation of a picture frame on and along the edge of the outer film of the main panel, thus framing visual patterns of the underlying sheet which are visible through the transparency of the outer film. 10 An external film can thus be produced with masking effects on certain areas of the sheet with visual patterns.

  The invention, in its basic version or in its various forms, therefore makes it possible to simply obtain, in addition to the own technical effects, particularly rich and original visual effects in a relatively simple manner with aesthetic and / or information of the textual or pictographic type: instructions, information or others.

  Finally, each of the films used to produce the two layers of the walls of the bag are produced from materials which are already used industrially (plastics in particular) and according to production steps which, for some, are already used industrially. (welding of plastics for example).

  This also results in a reduced cost.

  The present invention will now be exemplified without being limited thereto with the following description in relation to the following figures: Figure 1 which represents a flat bottom bag seen from the front, Figure 2 which represents a horizontal section of the bag of Figure 1 along Il-l, Figure 3 which represents a first vertical section of the bag of Figure 1 along 111-111, Figure 4 which represents a second vertical section of the bag of Figure 1 along IV-IV, Figure 5 which represents the flat bottom bag seen from the front of Figure 1 but with the upper part of the panels not folded towards the inside of the bag, Figure 6 which represents a vertical section of the bag of Figure 5 according to VI-VI , Figure 7 which represents Figure 5 according to VII-VIl, Figure 8 which represents a Figure 9 which represents 10 Figure 8 according to IX-IX, Figure 10 which represents of Figure 8 according to XX, Figure 11 which represents of Figure 8 along XI-XI.

  As indicated (simplified of the invention, the interlocking of two pockets a horizontal section of the bag of the bag with a pointed bottom seen from the front, a horizontal section of the bag of a first vertical section of the bag a second vertical section of the bag é in the general presentation and the bag consists substantially of summer bags or simple bags, one exterior and one interior, one inside the other (many variants are possible, in particular for the pocket or simple interior bag) and 20 inserting at least one sheet with visual patterns in between.

  These simple pouches or bags correspond to films, preferably in plastics.

  In a preferred embodiment, the dimensions of the inner film are slightly smaller than those of the outer film with the exception of the depth, the latter being measured when the bellows are developed. In practice for a bag with an approximate outer dimension of 430mm in height, 300mm in width (approximately the equivalent of an A3 format) and 1OOmm in depth, we remove 10mm on the height and 5mm on the width for the inner film that will be used to make the laminated structure bag. These dimensions are indicative and in the case where the printed pattern sheet is of A3 format, film dimensions will be adapted accordingly, that is to say slightly larger than that of the A3 sheet. Other dimensions are also possible within the limit of a rational use of the bag. In particular, it is preferable that the height of the bag is not too great so that, carried by a user with arms outstretched along the body, it does not drag on the ground.

  Several methods of making the bag are possible.

  Three main series of steps are implemented, the first to make forms of films (interior and exterior) which will be, in the second series of steps, nested one inside the other then, in the third step, to insert one or two sheets with visual patterns between the films of the main panels and to install gripping means. During these steps, and depending on the more particular structure of the bag, in particular its bottom, its access opening with gripping means and, optionally, joining of the bellows films, steps can be added to a series (ex: installation of a bottom plate) and / or moved (ex: sandwich bottom plate or not). For the first series of steps, alternatives are possible. It is thus possible to use films of the tubular sheath type and to produce the panels by folding or, in the extreme, to weld / glue together, laterally, independent films each having the shape of one of the panels. Between the two, it is possible to use films which are already the combination of two panels (main + lateral), three 25 (main + lateral + main or lateral + main + lateral) with one, or four panels then to glue / weld these films together laterally to create at least the equivalent of the tubular sheath.

  The preferred method of implementation consists in starting from a segment of film of the cylindrical sheath type then in folding it in order to form the various panels and bellows and finally in carrying out the bottom closure by a process which will depend essentially on the material of the material. film, for example in the case of a heat-sealable plastic material of the polyethylene type, by thermal welding or ultrasound. The cylindrical sheath can be obtained by conventional extrusion methods and it makes it possible to avoid having to carry out lateral fastenings between panels, of economy and more regular visual appearance. The joining along a joining line (edge or other) is preferably continuous but it can be discontinuous, point to point for example. It is preferably simple but it can also be multiple with several parallel securing lines.

  Another method can be the shaping of a tracing paper (or other material) with creasing, possible cutting, then folding along the creasing lines and mounting and lateral closing (fixing of the panels between them) and background.

  Several bottom structures can be produced. The simplest is a pointed bottom with termination and securing of the lower edges of the panels while the bellows along this edge is in the folded position.

  - A flat bottom can also be produced. In the latter case, the lower part of the bellows is in the unfolded position when the lower edges of the panels are joined together. In the latter case, folds are preferably also produced at the lower part of the bag in order to be able to switch the bottom between a position substantially parallel to the main panels in the bag storage position and a position substantially perpendicular to the main panels in position d use of the bag. Still in the latter case, a bottom plate can be used in order to reinforce said flat bottom.

  In its simplest embodiment, the bottom is formed by the closure by securing the lower edges of the single outer film, in particular in the case of a flat bottom. As we have seen, other joining structures are possible and in the case of a pointed bottom, it is preferable to join together the lower edges of the two outer and inner films.

  The steps indicated above and below can be manual, but they are preferably carried out in automatic or semi-automatic machines. These steps concerning the outer film can also relate (in whole or in part depending on the type of bottom of the bag produced, especially double bottom or not) the inner film of the bag.

  The following steps correspond to the second series with the assembly of the two films together by fitting the shapes of the exterior and interior films made in the preceding steps.

  We obviously make sure that the films are arranged so that their upper edges of the bag opening are in relation and that their respective bottoms are in relation to each other so that an operational bag, that is to say having an opening in high so that objects can be inserted therein and a closed bottom can be produced. It is understood that in the case of a bag with a single common double bottom, the bottom of the films can be closed as described in the first series of steps, which leads to a final joining step of funds already closed after or in the second series of steps of inserting the inner film into the outer film (casing) or done jointly on films with non-closed bottoms in such a step of securing the bottoms.

  On the other hand, it is understood that it is necessary to take into account in the course of these steps the way in which the sheet or sheets with visual patterns can be arranged on and in the bottom of the bag and whether or not a bottom reinforcement, in particular in the form of a cardboard plate which may or may not be fixed to the bottom in the bag, whether between the two films (sandwiched) or inside the interior or interior film (interior film not closed).

  Consequently, depending on the arrangement of the reinforcement on the bottom, the bottom reinforcement will be placed during the first or the second series of steps. In the case of a fixing by heat sealing of the bottom plate, a cardboard plate 30 with a film of compatible plastic material is advantageously used in order to facilitate heat sealing in the case of plastic films.

  The third step consists of inserting one or two sheets with visual patterns between the films and installing gripping means. A visual patterned sheet is inserted between the two exterior and interior films, preferably in each of the main panels. The sheet can be left completely free or, preferably, can be sandwiched along the line for securing the films along their upper edges, most of the surfaces of the sheet being free with respect to the films.

  The step of installing the gripping means depends on the gripping means chosen. In the case of a pair of handles, each handle is formed of a handle attached to a strip of material which is secured along the upper edge of a main panel. In this case, the films are preferably joined together (preferably with the sandwich sheet) and from the strip of material to the internal film on the internal face in one and the same step. The handles are preferably made of a heat-sealable plastic material compatible with that of the films 15 for securing.

  We have seen that it was also possible to use one or more cords passed through holes in the main panels.

  Preferably one cord is used per main panel. It is also possible to use a single cord which passes through all of the orifices and the two ends of which can be knotted together. Preferably, the bag is reinforced on the side of the opening, on the one hand, with two substantially rigid reinforcing plates secured to the internal face of the inner film of the two main panels and, on the other hand, with folding of the upper ends of the panels towards the inside of the bag so that the reinforcing plates are masked by this folding. This produces a reversal of a hem of the panels inside the bag. In this latter configuration, orifices are made in the main panel 30 at the rate of two by passing the cord through the bag and also passing through the reinforcing plate. As for the bottom plate, the reinforcing plate advantageously comprises a film of compatible plastic material in order to facilitate heat sealing in the case of plastic films for joining.

  It is understood that the plates (bottom or reinforcement) can have different shapes. In the simplest mode they are essentially flat. Alternatively and for example, they may have flanges (bottom plate) or be continuous around the bag opening (reinforcement plate extended all along the opening and therefore having folds of side bellows). The sheets, in particular of cardboard, also have the advantage of being relatively thermally insulating, which can facilitate the operations of joining by thermal welding. In particular, a bag opening which has cardboard reinforcing plates which are internal can be pinched between the jaws of a welding device pressing the upper ends of the two external faces of the two main panels to secure the films outside, inside 15 (possibly, preferably, the sandwich patterned sheet) and the plate without the two main panels being welded together.

  We will now describe two examples of bags which implement certain combinations of the means 20 previously indicated. However it is understood that in the context of the invention a flat bottom bag can have a gripping means of the cord type that a pointed bottom bag can have handles or vice versa and that more generally all possible combinations of types of backgrounds and types of openings are possible.

  In the figures which follow, in particular the sections, the spacing between the films and / or the sheet with visual patterns has been exaggerated in certain parts of the zones where these elements are not joined together in order to facilitate the explanation of 30 the invention. In practice, even if these elements can touch each other, they are free from each other over most of their corresponding surfaces, bonding being provided essentially only towards the upper end of the panels (opening) and the lower end of the panels (bottom). Finally, if the detailed description relates to a laminated bag whose side panels each have a bellows, the invention can also be implemented with side panels without bellows or more than one bellows.

  A laminated bag 1 with a flat bottom 3 is seen from the front in FIG. 1 5 with in the foreground one, 4, of its two, 4 and 9, main panels, the main panel 9 in the background being hidden, and on each side of this main panel 4 visible, two side panels 8,8 'with masked bellows in this front view.

  Each panel of the bag is formed in thickness from the superposition of two films, the exterior of which is here transparent and the interior opaque. The visible main panel also has a sheet between the two films with outward-facing visual patterns to make them visible. The main panels and the side panels are in lateral continuity, the bag having been produced from films of the tubular sheath type. The lower part of the bag forming the bottom 3 is closed by welding 7 to the lower edges of the two main panels and the two side panels. The bag being flat-bottomed, the lower edges of the bellows of the side panels 8,8 'were welded in the unfolded position. The folds of the bellows are shown in dotted lines under the references 5 and 5 ′ for explanatory purposes. The bottom 3 is shown here folded against a main panel. The upper part of the bag corresponding to its opening comprises a gripping means which is here a cord 2 per main panel and 25 which has passed through two pairs of corresponding orifices in the main panel and the two ends of which have a knot 14 for locking on the edges of the orifices.

  The bag has a laminated structure with a thickness of two films, the exterior 10 of which is transparent 30 and the interior 12 opaque. The main panel 4 visible, because in the foreground, therefore further comprises a sheet 11 between the two films 10, 12 with visual patterns oriented outward in order to make them visible. We can therefore distinguish through the transparent outer film of the main foreground panel a sheet with 35 visual patterns. Preferably, the outer film 10, the sheet 11 with visual patterns, the inner film 12 are joined together by welding 6 along the upper edge of each main panel 4,9, the sheet 11 thus being held at its upper part, however , the upper parts of the bag panels being folded inward, forming an inner hem, this connection is not visible in Figure 1 (it is shown here referenced 6 in dotted lines for explanatory purposes). The films are made of polyethylene and the connection corresponds to a heat seal. The sheet 11 with visual patterns is made of paper. A plastic coating can be made on the bottom or reinforcement plates in order to facilitate their joining (possibly for the bottom).

  In FIG. 2, the horizontal section II-1 of the bag of FIG. 1 passes at the level of the orifices for passage of the cord (s) 2 15 of the gripping means. The upper parts of the panels have been folded inwards and there are therefore two superimposed thicknesses of panels which are free between them, the folded part not being secured to the non-folded part of the corresponding panel other than by action. of the cord passed 20 into corresponding orifices. Inside the fold, a reinforcing plate 13 has been placed through which the cord also passes. Thus in this FIG. 2, if we consider for example the main panel 9, we find in thickness from the outside towards the inside of the bag the outside film 10, the sheet 11 25 with visual patterns, the inside film 12, the reinforcing plate 13, the interior film 12, the sheet 11 with visual patterns, the exterior film 10.

  If, for example, the side panel 8 is considered, the outer film 10, the inner film 12, the inner film 12, the outer film 10 are found in thickness from the outside towards the inside of the bag.

  It will be recalled here that the outer film 10 (and preferably sandwiched, the sheet 11 with visual patterns), the inner film 12 and the reinforcement plate 13 are joined together by welding, from the outside to the inside. along the upper edge of the main panel although this is not visible in FIG. 1 (only by explanatory dotted lines 6) or in FIG. 2 (because a section passes outside the lines of attachment of the upper edges of the main panels). On the other hand, in this embodiment, the upper edges of the side panels 8,8 'with bellows 5,5', formed of the only exterior films 10 and interior 12, are not joined together.

  In Figure 3, a vertical section 111-111 of the bag of Figure 1 is shown. Along the cut of a main panel, the outer film 10, the sheet 11 with visual patterns and the inner film 12 are essentially free from each other except on the 10 securing lines 6 along the upper edges of the main panels simply folded towards the inside. Here, the sheet 11 is not shown sandwiched between the inner 12 and outer 10 films along the joining line 6, however, in another preferred embodiment but not shown, it can be sandwiched. In this embodiment, each main panel 4 or 9 has its own sheet 11 with visual patterns.

  In the embodiment shown in FIG. 3, the bottom 3 of the closed bag is formed, on the one hand, by the weld 7 between them of the lower edges of the outer film 10, bellows unfolded and, on the other hand, by the weld 15 between them of the lower edges of the inner film 12, the bellows unfolded, the bag then having two separate closed bottoms, ie two independent closed bottoms. A bottom plate 16 is placed on the bottom of the bag, in this case in this embodiment, on the inner sheet. In a variant not shown, the bottom plate can be secured to the bottom of the bag. In an alternative not shown, the bottom can be achieved by the sole closing of the outer sheet, the inner sheet 30 being left open, the bottom plate is then against the internal face of the outer sheet 10. In another alternative not shown, the bottom can be achieved by closing the outer sheet and the inner sheet together, the bag then having a single closed common bottom.

  In Figure 4, the vertical section of the bag of Figure 1 passes substantially along the side edge of the bag and we therefore distinguish in addition the folds of the side wall 8 with bellows. The bottom of the bag 3 on this section has a more complex structure 5 due to the folds of the lower end of the side panel (which is in the unfolded position) and made necessary for attachment to the lower end of the main panels.

  In Figure 5 the bag from Figure 1 is repeated but this time the upper parts of the panels are not folded inwardly of the bag to form the hem. This Figure makes it possible to specify the arrangement of the cord passage orifices 2 at the rate of two pairs of orifices per main panel. In this FIG. 5 we can now see the securing line 6 of the films of the main panel 4 visible in the foreground.

  As indicated and visible in FIG. 6, along the joining line 6, are welded together from the outside to the inside, the outside film 10, the inside film 12, the reinforcing plate 13. However, preferably and not shown, it is also possible to secure the sheet 11 with visual patterns along this line 6, the sheet then being sandwiched between the films. The superimposed orifices through which a cord passes are intended to come into correspondence after folding inward of the bag from the upper ends of the panels.

  Figure 7, pendant from Figure 2 but without the hem, 25 provides a better understanding of the arrangement of the films 10, 12, sheets 11, reinforcement plates 13 of Figure 2 once the folding of the upper ends of the panels has been carried out. hem production.

  Figure 8 shows a stratified bottom bag 23 with a point which is seen from the front with in the foreground, one of its two main panels and on each side of this visible main panel, two side gusseted panels, hidden in this view front. The main panels and the side panels are in lateral continuity, the bag having been produced from films of the tubular sheath type. The bottom part of the bottom format bag is closed by welding the bottom edges of the two main panels and the two side panels. The bag being fully pointed, the lower edges of the bellows of the side panels were welded in the folded position. The bag has a laminated structure 5 identical to that of the bag in FIG. 1 with a thickness of two films, the exterior of which is here transparent and the interior opaque. The visible main panel also has a sheet between the two films with outward-facing visual patterns to make them visible.

  In this Figure 8 there is therefore a main panel 24 visible foreground but the side panels 28 and 28 'bellows 25 and 25' are hidden as well as the main panel 29 background. The joining line 27 of the ends or lower edges of the panels is visible in the form of a weld line 15 enabling the closed bottom 23 to be produced, the films constituting the panels being heat-weldable. As before, a sheet with visual patterns can be seen through the transparent outer film of the main foreground panel.

  In addition, the bag has a pair of handles of heat-sealable plastic material 20 each comprising a handle 21 attached to a strip of material 22 (not visible in Figure 8 because inside the bag). Additional clipping means are arranged on the handles and the strip of material in order to allow the bag opening to be locked / unlocked. In this embodiment, the securing line 26 towards the end or upper edge of the main panel is visible in the form of a weld line.

  If the ends or upper edges of the outer and inner films of each main panel are joined together, on the other hand the upper edges of the outer and inner films of the side panels are left free between them in this embodiment.

  The section of Figure 9 shows the arrangement of the elements of the panels with the outside towards the inside of the bag for a main panel 24 or 29, the outer film 10, the sheet 11, the inner film 12, and for a side panel 28 or 28 ', the outer film 10, the inner film 12, these elements being free from each other. The vertical section of Figure 10 passes substantially through the middle part of the bag of Figure 8 and allows to visualize the arrangement of the elements of the main panels of the bag. In particular on the joining line 26 towards the upper end of the bag, there is welded, from the outside of the bag to the inside: the outer film 10, the inner film 12, the strip of material 22. As shown in FIG. 'indicated, in a variant not shown and preferably, it is also possible to secure the sheet 11 with visual patterns sandwiched between the films 10, 12 along the joining line 26. We can better distinguish in this Figure the means of clipping complementary to the pair of 15 handles. As before, each main panel 24 or 29 has its own sheet 11 with visual patterns. The bottom 23 is formed by closing the lower edges of all the panels of the single outer film 10 by welding along the bottom joining line 27. The inner film 12 remains open. In alternatives not shown, the bag can have two independent closed bottoms or a single closed bottom combining interior and exterior films.

  The vertical section of Figure 11 passes to a side end of the bag and there can therefore be found a section of a side panel with bellows. It can be noted that the lower end of the side panel is secured in the folded position along the fastening line 27 at the bottom 23.

  In a variant not shown of the bag, the films of the bag are joined together along the upper edges can be carried out with removable means (for example clipping, "zipping") allowing detachment and then re-attachment at will, this in order to allow a user to change the printed pattern sheet which is between the two films of a main panel. In such a case, it is preferable to extend the joining of the upper edges of the films, in addition to the main panels, to the upper edges of the side panels, this upper joining of the films of the side panels being, on the other hand, definitive in order to avoid risk of destroying the general structure of the bag when the upper edges of the main panel (s) are detached.

  It is even envisaged to supply the bag of the invention in the form of a kit, the end customer being able, with printing or copying means for the general public, to insert their own sheets with printed patterns between the two films of one or of the two main panels. . In the case of a kit, the opening connection means may be for single use, a separation being impossible after connection by the customer, the bag in the kit being delivered unconnected.

Claims (17)

  1. Bag formed by a first main panel, a second main panel and two side panels, the side edges of said panels being in continuity and the lower edges of said panels being joined together to close the bag and form a bottom bag, the upper edges of said panels defining an access opening inside the bag, gripping means being further disposed towards the upper ends of the main panels, characterized in that the panels are laminated in thickness, the panels being formed by the superimposition of the exterior and interior of the bag of an exterior film and an interior film, the surfaces in correspondence of contact of said films being essentially free from each other, the exterior film and the film 15 interior being joined together along the upper edges of the panels at least along the upper edge of the first main panel and along the bo upper rd of the second main panel, the bottom of the bag being closed by securing at least one outer film along its lower edges of the panels and in that at least one of the two main panels is inserted, between the two films, a sheet with visual patterns on at least the surface of the sheet oriented towards the outside of the bag, the outer film being at least translucent in order to make visible from the outside of the bag the visual patterns, the surfaces of the 25 sheet and films in contact correspondence being essentially free from each other.   2. Bag according to claim 1, characterized in that the main panels each comprise a sheet with visual patterns inserted between the two films of the panel.   3. Bag according to claim 2, characterized in that the sheet with visual patterns of each of the main panels is a single continuous sheet from the first main panel, passing through the bottom of the bag and to the second main panel. 4. Bag according to any one of the preceding claims, characterized in that the inner film is preferably opaque, in particular by dyeing in the mass.   5. Bag according to any one of the preceding claims 5, characterized in that the film is obtained from a sheath of the tubular segment type with two opposite openings, one of the openings being intended to form the access opening inside the bag and the other opening being in relation to the bottom of the bag.   6. Bag according to any one of the preceding claims, characterized in that the sheet with visual patterns is in a material chosen from paper, cardboard, fabric, a plastic material.   7. Bag according to any one of the preceding claims, characterized in that the lower edges of the inner film of the panels are joined together while being free relative to the outer film of the panels, the bottom of the bag being closed, d on the one hand, by securing the lower edges of the outer film of the panels and, on the other hand, independently, by securing the lower edges of the inner film of the panels, the bag thus having two independent closed bottoms superposed.   8. Bag according to any one of claims 1 to 6, characterized in that in the case where the sheet with visual patterns is not continuous from one main panel to the other, the lower edges of the outer films and inside the panels are joined together to form a common single closed bottom. 9. Bag according to any one of claims 1 to 6, characterized in that the lower edges of the inner film of the panels are not joined to each other, the bottom of the bag being closed by the sole joining of the lower edges of the film outside of the panels.   10. Bag according to any one of claims 7, 8 or 9, characterized in that it is completely pointed, the lower edges of the panels being joined together along a bottom line, the side panels having bellows in the folded position along said bottom line.   11. Bag according to any one of claims 7, 8 or 9, characterized in that it is flat-bottomed, the lower edges of the 5 panels being joined together along a bottom line, the side panels having bellows in the unfolded position along said bottom line, the lower part of the bag panels having folds allowing, when the bag is stored empty, the folding of the flat bottom substantially parallel and against a main panel and, when the bag is in the use position, the folding of the flat bottom substantially perpendicular to the main panels and in that in addition a substantially rigid bottom plate is disposed at the bottom of the bag in order to reinforce the flat bottom.   12. Bag according to any one of the preceding claims, characterized in that, in addition, along the upper edges of the films of a main panel, the sheet with visual patterns is secured to the two films, the sheet being sandwiched between the exterior and interior films along their upper edges secured to each other.   13. Bag according to any one of the preceding claims, characterized in that the gripping means is a pair of handles, each handle formed by a handle attached to a strip of material being secured along the upper edge of a main panel by the material strip.   14. Bag according to any one of claims 1 to 12, characterized in that the gripping means is a pair of cords with knotted ends for blocking and forming handles, each cord being passed through at least two orifices 30 towards the upper end of a main panel passing through the outer film, the corresponding visual pattern sheet and the inner film.   15. Bag according to claim 14, characterized in that the upper end of the bag comprises: - reinforcement means of the type of substantially rigid reinforcing plates secured on the internal surface of the bag of the inner film, each of the main panels comprising a reinforcing plate fixed along the upper edge of the inner film, the two orifices for passage of a cord further passing through the plate, - reinforcing means of the type of folds towards the inside of the bag of the upper ends of each panels, the two orifices then being on the fold towards the inside of the bag and each cord also passing through two other orifices of the corresponding main panel and in correspondence with the two orifices of the fold.   16. Method for producing a bag formed by a first main panel, a second main panel and two side panels, the side edges of said panels being in continuity and the bottom edges of said panels being joined together to close the bag and form a bag bottom, the upper edges of said panels defining an access opening inside the bag, gripping means being further arranged towards the upper ends of the main panels, characterized in that to obtain a bag which is according to any one of the preceding claims, - panels have been produced which are laminated in thickness by interlocking an inner film with an outer film, the surfaces in correspondence of contact of said films being essentially free between them, - the outer film and the inner film are joined together along the upper edges of the panels at least the l ong of the upper edge of the first main panel and along the upper edge of the second main panel, - the bottom of the bag was closed by securing at least one outer film along its lower edges of the panels, - we inserted between the two films of at least one of the two main panels a sheet with visual patterns on at least the surface oriented towards the outside of the bag, the external film being at least translucent in order to make it visible from the outside of the bag the patterns, the surfaces of the sheet and films in contact correspondence being essentially free from each other 17. Method according to claim 16, characterized in that a sheath of the tubular segment type with two opposite openings is used for the film, one of the openings being intended to form the access opening inside the bag and the other opening being in relation to the bottom of the bag.