EP3932822A1 - Plastic packaging with framework made from cardboard or another bio-sourced material without gluing - Google Patents

Abstract

Packaging in particular suitable for containing food comprising on the one hand a container made of plastic-type material provided with a bottom and a continuous peripheral wall (5), the upper edge (6) of the peripheral wall (5) opposite the bottom delimiting an opening and being provided with a peripheral rim (7) extending radially outwards, and on the other hand an outer covering (40) the cut-out of which is made in a flat blank of recyclable material of the cardboard type and arranged in contact with the outer face of the peripheral wall (5), means for detachably connecting the coating (40) to the container being provided. Said connecting means consist of a peripheral groove (8) running through the outer face of the peripheral wall (5) of the container delimiting a housing space adjusted for an upper edge of the covering (40) of a shape adapted to the shape of the groove ( 8).

Description

The present invention relates to packaging, and more particularly to trays and boxes intended in particular to contain food. These packages have a container offering an interior space or volume delimited by a bottom and lateral sides, generally made of plastic and manufactured in a conventional manner, for example by thermoforming. They then include a means of closure, by a cover or by a sealed film or not. So that the handling of these packages, when they are filled, are not made difficult by the weight of the contents, the container must have a mechanical strength which impacts at least some of its dimensions, in particular the thicknesses of the walls which delimit it. .

However, it is generally sought to reduce the quantities of plastic material used, in particular with a view to reducing the so-called carbon balances associated with them. These balances are notably impacted by waste treatment operations, the requirement for the most successful recycling possible greatly contributing to this. Reducing carbon footprints obviously also has a direct economic impact, with processing costs obviously having repercussions on the prices of packaging, which consumers ultimately bear.

For these reasons, the packaging industry is seeking to reduce the amount of plastic used in the manufacture of trays, boxes and other containers. Among the solutions proposed, it is in particular recommended to use an external structure made of cardboard material, which reinforces the rigidity of the packaging when the thicknesses of the walls are thinned. The external reinforcement structure implemented improves the overall mechanical strength of the container by compensating for the lack of rigidity resulting from the lack of plastic material. However, there are already recycling channels for cardboard and it is planned that all plastic packaging can be recycled soon.

However, solutions based on a cardboard structure still have multiple drawbacks, in terms of the manufacturing process first, but also in environmental issues related to recycling. Certain configurations proposed indeed require gluing of the cardboard structure. on the outer walls of the container, which has the consequence of making the manufacture more complex, and consequently more expensive. This is for example the case of the configuration described in the document WO2015187016 . A second drawback of this solution is due to the glue itself, which is a substance potentially harmful to the environment when the packaging is recycled, which is often burned on this occasion. Finally, this type of configuration prevents, or at the very least makes problematic the selective recycling of the packaging because it is difficult to separate the plastic container from the outer reinforcing structure, without even mentioning the existence of adhesive residues on the packaging. either element in the event of separation.

In an attempt to find an answer to these questions, some solutions are devoid of glue between the plastic container and the cardboard structure, but the latter must be preformed (change from a two-dimensional configuration to a three-dimensional configuration) before being applied to the container. This preforming may require, in certain proposed configurations, the use of glue not between the plastic and the cardboard, but between parts of the cardboard structure to be fixed to one another to give it the three-dimensional shape. This is the case in particular in the solution described in the document WO2015187016 or in the one that appears in the document FR 2 979 329 .

In other cases, however, this three-dimensional preforming may dispense with glue and simply result from the initial design of a flat card stock blank with cutouts and creases allowing three-dimensional folding and assembly, as is the case. case for example of the configuration described in the document WO9323297 .

All these cardboard structures have a bottom and peripheral walls, said walls then comprising sections which overlap during the three-dimensional forming, since they must be mechanically assembled to one another. Then, their attachment to the plastic containers generally results from surfaces or ridges interpenetrating to lock them to each other preventing any relative movement in a direction perpendicular to the plane of the bottom of the container.

The invention provides a considerably simplified solution to achieve the same result, with a dual configuration with an external structure made of cardboard-type material or other bio-sourced material and internal plastic packaging, recyclable, designed to make assembly much easier and , consequently, much more easily integrable into an industrial automation line. The finished product is a bi-material packaging, typically in plastic, guaranteeing food quality, reinforced with cardboard, requiring no gluing operation and allowing easy separation of the two elements so that sorting and recycling do not pose any problem. . The packaging obtained is rigid although the plastic thicknesses are appreciably reduced at least at the level of the lateral sides, the loss of resistance linked to the reduction in thickness of the plastic sheets being compensated by the external layer made of a sufficiently rigid material of the type. cardboard or other bio-sourced material. In addition, the use of the cardboard reinforcement structure opens up many perspectives in terms of decoration / communication on this type of packaging.

The use of cardboard thus makes it possible to implement printing / color on the front / back cardboard, but also to emboss in relief on the cardboard during forming, and finally to have a constant stacking step. . As regards the plastic packaging, the existence of a cardboard outer structure according to the invention has no impact on the design of the possible closure methods, and the packaging can thus be provided with a cover. separate, hinged cover, sealable film, stretch closure film etc.

In fact, to summarize, the packaging of the invention, in particular suitable for containing food, conventionally comprises on the one hand a container made of plastic-type material provided with a bottom and a continuous peripheral wall. The upper edge of the peripheral wall opposite the bottom defines an opening and is provided with a peripheral rim extending radially outwards. The packaging of the invention also comprises an outer covering, the cut of which is made in a flat blank of recyclable material of cardboard type and placed in contact with the outer face of the peripheral wall in the assembled state. It also presents, in a known manner, detachable connection means of the coating to the container.

According to the invention, said connecting means consist of a peripheral groove running through the outer face of the peripheral wall of the container, opening towards the bottom of the container and being delimited by two parallel-looking walls respectively formed by an upper strip. of the peripheral wall of the container adjoining the upper edge and by an outer wall of the peripheral rim facing said strip, said groove delimiting a housing space adjusted for an upper edge of the liner having a shape adapted to the shape of the groove.

This solution implements a purely mechanical fixing which surrounds the container and can therefore be exerted continuously on the periphery of the packaging. This is in fact a plastic crimping in the upper part of the covering, which keeps the covering formed by the latter in place. The envelope of cardboard material is shaped to adapt to the volume of the container, and is clamped between the two walls of a narrow groove, which in fact results in distributing the stress of fixing the coating to the container over the entire periphery. Fixing over the entire periphery does not require, moreover, to conform the coating three-dimensionally before assembly on the container, it may suffice to insert it into the mold before thermoforming.

On a purely mechanical level, this distribution of forces due to the peripheral crimping also eliminates the need for more complex mechanical solutions, which are on the other hand necessary if the detachable fixing takes place only in a few discrete places of the packaging: it is therefore necessary to achieve a higher fixing efficiency therein, where appropriate in combination with means for attaching certain parts of the coating to one another.

According to the invention, preferably, at least the upper strip of the peripheral wall of the container and the outer wall facing said strip are inclined at an angle of between 5 ° and 45 ° with respect to the vertical. The slope given to the sides of the container, allowing manufacture by undercut thermoforming of the plastic material, allows the assembly to be joined together without any additive (glue, lacquer, etc.). It also facilitates the separation of the two elements easily for the recycling of each of the elements. In fact, the plastic container, thanks to its thermoformability, encloses the part top of the cardboard positioned in the mold before thermoforming, by undercut effect on all or part of the periphery.

It should be noted that the effect of the undercuts is particularly effective in the angles, where there is a natural reinforcement due to the existence of undercuts in two different directions, in the hypothesis of polygonal containers with a slope. lateral. The existence of ridges in said angles makes the plastic there, and consequently the undercut, more rigid, so that the maintenance of the cardboard on the plastic is more efficient.

In the present invention, more preferably, the width of the peripheral groove is equal to the thickness of the blank of the outer covering. There is in fact and as mentioned no need to provide a form of coating comprising portions which overlap when the coating is in contact with the packaging, thus creating extra thicknesses and requiring the use of a surface of carton greater than the surface of the packaging to be covered.

Furthermore, the groove can be provided axially discontinuous, although it is always peripheral: whatever its exact shape and the number of interruptions, it runs around the periphery of the packaging. In other words, whatever the intended shape, the general nature of the groove remains peripheral. Thus, said groove may comprise a succession of slots, the frequency of the aliasing having to remain compatible with the requirement of peripheral path.

According to one possible configuration, the crenellations can be trapezoidal in shape, the smallest of the parallel sides of the trapezoids being in alignment with the bottom of the crenellated groove. This specific shape also provides undercuts resulting in reinforcing the crimping and in guaranteeing the maintenance of the external coating around the plastic container.

In the same perspective, at least one of the walls forming the groove may include reliefs projecting towards the inside of the groove, also creating well-marked undercuts further enhancing the quality and durability of the crimping. According to one possibility, these reliefs can be inserted into orifices or slots of corresponding shapes made in the upper edge of the coating. In this case, the reliefs and the orifices in which they are inserted in fact produce a kind of riveting. Alternatively, the reliefs can accommodate in embossings of corresponding shapes made in the upper edge of the covering, and of which they follow the shape.

In fact, the cutout of the blank of the outer covering may include at least a portion of shape and area equal to the shape and area of the peripheral wall of the container. In other words, the coating of the peripheral wall may be completely covering and only comprise sections or portions which do not overlap when they are in contact with the latter. Additionally, the blank cutout may include a portion of shape and area equal to the shape and area of the bottom of the container. Thus, the coating can go as far as covering the bottom and the peripheral wall of the container. In all cases, the absence of overlapping portions, where appropriate provided with mutual fixing means, makes it possible to use a plan model for cutting the covering that is as simple as possible, easy to manufacture and to use, economical in terms of cardboard area.

When the container has a polygonal bottom, for example rectangular, and lateral sides forming the peripheral wall, the coating may for example in practice include a polygonal bottom with the same surface area as the bottom of the container, separated by grooves from the lateral surfaces of the surfaces. equal to the surfaces of the lateral sides of the container including the wall of the groove.

For such packaging with prismatic volume, the crimping can be reinforced in a particular way, at the level of the corners: at least one relief projecting from the wall of the container can equip each corner of the groove, the side panels of the coating then being provided with slots. matching the portion of these reliefs present in the groove section of their lateral insertion side.

The crimping groove is in fact at least partially formed in the flange extending radially outwards from the upper edge of the container, which may also have the function, at least in certain configurations of the packaging, of allowing the crimping. closing a cover, for example by clipping a peripheral profile of a cover into a gutter of corresponding shape made in the peripheral rim of the container.

Thus, according to one possible configuration, the outer wall of the groove may belong to a gutter of trapezoidal cross section, which has a oblique wall with the same inclination as the portion of the peripheral wall of the container which it faces. The parallelism of the two walls of the groove is found in this configuration, and the distance from the wall of the gutter to the peripheral wall of the container is provided of the same order of magnitude as the thickness of the cardboard blank from which the coating is realized.

In certain packaging configurations, said gutter may be provided axially discontinuous. This is for example packaging without adjoining lids, those which are sealed by means of a film sealed on the edges of the container. In such a case, the edges of the container serve as a fixing support. An axially discontinuous gutter enhances the rigidity of the sealing surface. It is therefore planned not to run the gutter continuously, but to interrupt it regularly.

According to one possibility applicable to all the packaging configurations presented above, the coating may have cutouts, for example simple geometric figures, having a first decorative vocation and in particular making it possible to be able to see the packaged product. It should also be noted that the use of cardboard coverings allows extensive use of this support for decoration or information purposes, by printing on the surfaces of the cover, cutting out multiple shapes, making decorative stampings, etc. . In fact, the side walls of the casing can benefit from all kinds of treatments allowing a stronger marketing effect, which can moreover, if necessary, strengthen its attachment to the container.

Thus, secondarily, for example, provision can be made for the peripheral wall of the container to have reliefs located at the level of the cutouts of the coating, and dimensioned to fit therein. In this case, an additional blocking of said peripheral coating is carried out in an orientation parallel to the sides of the container, in the direction of the bottom thereof.

Other objects and advantages of the present invention will become apparent during the description which follows relating to embodiments which are given only by way of indicative and non-limiting examples.

• La figure 1 représente une vue de dessus en perspective d'un emballage filmable conforme à l'invention ;
• La figure 2 montre, en vue en section, le même emballage ;
• La figure 3 illustre le fonctionnement de la gorge périphérique dans la version des figures 1 et 2 ;
• La figure 4 illustre une découpe de revêtement cartonné pour un tel emballage, en vue en élévation ;
• La figure 5 représente une variante, en vue perspective côté ouverture du conteneur, d'un emballage à opercule scellable muni d'un revêtement cartonné identique aux configurations précédentes ;
• La figure 6 montre le même emballage, en vue perspective côté fond ;
• La figure 7 montre, en vue en section, l'emballage des figures 5 et 6 ;
• La figure 8 en illustre un détail agrandi, en vue en section, au niveau de la gorge périphérique réalisant le sertissage du revêtement cartonné ;
• La figure 9 représente, en vue perspective par-dessus, une variante d'emballage à couvercle à gouttière de fermeture périphérique, le couvercle étant figuré en position ouverte ;
• La figure 10 montre le même emballage, en vue perspective par en dessous ;
• La figure 11 illustre, en vue en section, la variante des figures 9 et 10, le couvercle étant figuré en position fermée ;
• La figure 12 montre un agrandissement d'une section du même emballage au niveau de la gorge périphérique réalisant le sertissage du revêtement cartonné, le couvercle étant figuré en position fermée ;
• La figure 13 représente un agrandissement analogue, côté charnière, le couvercle étant en position ouverte ;
• La figure 14 représente, en vue perspective, une variante de l'emballage des figures 1 à 3 avec une gorge à reliefs en plots/cupules dépassant dans l'intérieur de ladite gorge et coopérant avec des orifices/embossages circulaires pratiqués dans la bordure supérieure des pans du revêtement ;
• La figure 15 montre le même emballage en vue en section ;
• La figure 16 est un agrandissement de la section de la gorge périphérique d'un tel emballage avec renfort de la solidarisation du revêtement cartonné par des plots traversants coopérant avec des orifices de la bordure supérieure des pans du revêtement ;
• La figure 17 montre le même agrandissement de la section de la gorge périphérique, le renforcement du sertissage étant réalisé par des paires de cupules/embossages arrondis ;
• La figure 18 représente une variante de l'emballage des figures 1 à 3 avec des reliefs de coins ;
• La figure 19 illustre une variante avec une gorge discontinue crénelée ;
• La figure 20 montre le même emballage en vue en section ; et
• La figure 21 représente un détail agrandi, en vue en perspective, d'un tel emballage à gorge discontinue crénelée.

The understanding of this description will moreover be facilitated by referring to the accompanying drawings, which represent configurations of the invention, and in which:

• The figure 1 shows a top perspective view of a filmable packaging according to the invention;
• The figure 2 shows, in section view, the same packaging;
• The figure 3 illustrates the operation of the peripheral groove in the version of figures 1 and 2 ;
• The figure 4 illustrates a cardboard cover blank for such a package, in elevation view;
• The figure 5 shows a variant, in perspective view on the opening side of the container, of a packaging with a sealable lid provided with a cardboard covering identical to the previous configurations;
• The figure 6 shows the same packaging, in a perspective view from the bottom;
• The figure 7 shows, in section view, the packaging of figures 5 and 6 ;
• The figure 8 illustrates an enlarged detail, in sectional view, at the level of the peripheral groove carrying out the crimping of the cardboard covering;
• The figure 9 shows, in a perspective view from above, a variant of packaging with a lid with a peripheral closing gutter, the lid being shown in the open position;
• The figure 10 shows the same packaging, in perspective view from below;
• The figure 11 illustrates, in sectional view, the variant of figures 9 and 10 , the cover being shown in the closed position;
• The figure 12 shows an enlargement of a section of the same packaging at the level of the peripheral groove carrying out the crimping of the cardboard covering, the cover being shown in the closed position;
• The figure 13 shows a similar enlargement, hinge side, the cover being in the open position;
• The figure 14 shows, in perspective view, a variant of the packaging of figures 1 to 3 with a groove with raised studs / cups projecting into the interior of said groove and cooperating with circular orifices / embossings made in the upper edge of the sides of the coating;
• The figure 15 shows the same packaging in section view;
• The figure 16 is an enlargement of the section of the peripheral groove of such a package with reinforcement of the attachment of the cardboard covering by through studs cooperating with orifices in the upper edge of the sides of the covering;
• The figure 17 shows the same enlargement of the section of the peripheral groove, the reinforcement of the crimping being carried out by pairs of rounded cups / embossings;
• The figure 18 represents a variant of the packaging of figures 1 to 3 with reliefs of corners;
• The figure 19 illustrates a variant with a discontinuous crenellated groove;
• The figure 20 shows the same packaging in section view; and
• The figure 21 shows an enlarged detail, in perspective view, of such a crenellated discontinuous groove package.

With reference first to figures 1 to 4 , a first packaging variant of the invention comprises a filmable container 1 having a bottom 4 in this case rectangular and four sides 5 forming a continuous peripheral wall and the upper edge 6 of which extends radially outwards by a rim 7 provided with a peripheral groove 8, the bottom of which forms the edge 6. The cardboard covering 40 (see figure 4 ) actually follows the external faces of the bottom 4 and the lateral sides 5, the lateral edges of each panel 41 to 44 meeting at the level of the corner edges of the continuous peripheral wall 5 of the container 1. The grooves 46 to 49 marking the fold lines between the bottom 45 and the side panels 41 to 44 of the cardboard covering 40 cover the bottom 4 / peripheral wall 5 connecting ridges of the container 1. The outer edge of said panels 41 to 44 is crimped in the groove 8, between an upper band 51 of the lateral sides 5 and the outer wall 81 which connects the upper edge 6 and the radial part of the peripheral rim 7.

More precisely, the peripheral groove 8 comprises a wall 81 of parallel appearance and facing an upper strip 51 on each side 5, these two walls and the flange 6 which connects them constituting in fact a groove 8 of width equal to l. 'thickness of each cardboard side 41, 43 of the covering 40. Over the entire periphery of the packaging, the cardboard covering 40 is therefore clamped in the peripheral groove 8, and therefore mechanically well held over the entire periphery of the container 1. This method of fixing prevents the panels 41 to 44 from having overlapping portions, since there is only room for a single thickness of cardboard in the groove 8.

The cardboard cover 40 (see figure 4 ) is in fact made from a planar blank cut and grooved so that the bottom 45 and the panels 41 to 44 constituting the lateral sides are separated by grooves 46 to 49 which constitute the fold lines between them. Unlike the solutions of the prior art, there is no mechanical means for the mutual fixing of the sections 41 to 44, for example via tabs / incisions connections or by gluing, which would in all cases require sections or protuberances. allowing a more or less partial overlap of the sections between them, allowing the practical implementation of a mechanical connection.

The lateral sides of the container 1 are inclined, in all the versions presented, because this provides an undercut effect on the periphery, in a reinforced way in the angles of the volume due to the double direction of the slope and the greater resulting container stiffness in this region. This undercut, in practice at an angle of 5 ° and 45 °, appreciably improves the attachment of the cardboard covering 40 as shown in figure 4 to the plastic volume of the container 1. Mechanically, the contact forces at the level of the wall 81 have a mainly horizontal component, but also a vertical component, less important given the degree of inclination of the oblique face, which is parallel to the sides 5 lateral.

This vertical component oriented upwards materializes the constraints applying to the external coating 40 with a view to maintaining it in the peripheral groove 8. These figures also show that the coating 40, which follows the whole of the bottom 4 and of the side walls 5 of the container 1 has a thickness which makes it suitable for providing a significant increase in the rigidity of the packaging.

The figures 5 to 8 show a packaging configuration without a lid but closed by a film sealed on the peripheral rim 17 of the container 1, which requires a surface of suitable dimensions for the sealing of the lid on the container to be "effective". The groove 8 is, in this configuration, made between a discontinuous gutter 18 which runs along the entire periphery of the rim 17 and the lateral sides 5 of the peripheral wall of the container 1. This appears as a discontinuous gutter in figure 5 turns out in practice to create terminals delimiting the external part of the groove 8, such as visible in figure 6 , de facto creating an outer wall 81 with a discontinuous groove 8.

The gutter 18 is in particular provided discontinuous to increase the rigidity of the rim 17 and allow good sealing quality. Furthermore, the outer part of the rim 17 oriented parallel to the base 4 is extended by a peripheral skirt 20 of shape perpendicular to said base 4.

The packaging closure cap, not shown, is fixed over the entire periphery of the container 1, over the entire flat rim area 17 available. The peripheral coating 40 is secured to the container 1 in exactly the same way as for filmable or lidded packaging, the groove 8 obeying the same dimensional characteristics as in the previous version of packaging, at least in width and depth, and also running all along the periphery of the packaging, however discontinuously. Taking into account the fixing constraints necessary to retain the coating in the groove 8, this method of fixing is however quite appropriate, the peripheral distribution of the forces being admittedly less complete but largely sufficient.

The packaging configuration of figures 9, 10 and 11 has a hinged cover 2 able to close elastically on the container 1, with the aid of corresponding profiles which snap into one another. The cover 2 and the container 1 are connected by a hinge 3 integrally with these two volumes. The profile which equips the peripheral rim 7 of the container 1 takes the shape of a gutter 18 of a section substantially equivalent to that of the previous variant, but continuous.

The domed cover 2, similar in shape to that of the container 1, comprises a corresponding rim 20 provided with a peripheral profile 21, the shape of which is dimensionally very close to that of the gutter 18, and which is intended to be housed therein. The respective dimensions of the gutter 18 and of the profile 21 allow a connection with adjusted elastic engagement of one in the other, a clipping resulting in that the edges 7 and 20 are in contact or almost in contact with one of the 'other. In this configuration, the domed cover 2 defines an additional volume for the packaging when it is closed.

The figures 12 and 13 show, in section, the mechanical attachment of the liner 40 to the container 1 in the lid solution of the figures 9, 10 and 11 . It obeys the same crimping scheme as the fixing methods of the previous variants, and is therefore done at the level of the upper edge of the panels 41 to 44, which is inserted between the upper strip 51 of the lateral sides 5 of the container 1 and the wall. 81 which faces it and which in this case belongs to the gutter 18, uniformly on all sides 5.

The gutter 18 (and the profile 21) has a trapezoidal outline, precisely so that one of its walls 81 is oriented parallel to a lateral side 5 in order to achieve a groove 8 of uniform width in depth as well as over the whole of the periphery, a width which is provided to ensure the fixing of the coating in a manner uniformly distributed over the periphery of the container. This same trapezoidal shape concomitantly makes it possible to ensure a closure by means of a cover with much better mechanical strength.

The configuration of figures 14 to 16 resumes that of the figure 1 , with the addition of reliefs projecting from the walls 51, 81 of the groove 8 inwardly in order to strengthen the attachment of the coating 40 to the container 1. More precisely, the studs 30 opposite (see below). figure 16 ) respectively protruding from the walls 81, 51 are inserted into orifices 52 of the same shape made in the upper edge of the cardboard covering 40, resulting in said covering being retained in the groove 8. These additional retention means add to the effect previously mentioned undercut. As a variant (see figure 17 ), the studs 30 can be replaced by cups 31 in the form of portions of spheres which exert a stress in recesses of corresponding shape stamped or stamped at the corresponding locations in the upper edge of the coating 40.

The variant of figure 18 comprises reliefs 32 made in the corners of the container, which retain the sides 41 to 44 by means of slots made in the upper portions of their side edges (not shown).

The variant of figures 19 to 21 , which is also close to the configuration of figures 1 to 3 , has a crenellated groove 8 overhanging the rim 7: said groove 8 is therefore not continuous but interrupted by regularly spaced crenellations 33. Thus, in the cross section of the figure 20 , the upper left part shows the panel 41 of the coating inserted in the groove 8 while in the upper right part, the section is at the level of a notch and the panel 43 therefore does not have a part inserted in a groove at this location . Taking into account the fixing constraints necessary to retain the coating 40 in the groove 8, this method of fixing is however quite appropriate, the peripheral distribution of the forces being largely sufficient in particular because of the trapezoidal shape of the crenellations, which create an effect. additional undercut.

The examples appearing in the figures are not, however, exhaustive of the invention, which also encompasses variations in shape, in particular but not exclusively for the gutter and its possible sections, for the shape and geometric volume of the container and of its cover, the where applicable, the shape and number of reliefs in the grooves, the cutouts in the coating, etc.

Claims (17)

Packaging particularly suitable for containing food comprising on the one hand a container (1) made of plastic-type material provided with a bottom (4) and a continuous peripheral wall (5), the upper edge (6) of the wall peripheral (5) opposite the bottom (4) delimiting an opening and being provided with a peripheral rim (7) extending radially outwards, and on the other hand an outer covering (40) the cut of which is made in a flat blank of recyclable cardboard-type material and placed in contact with the outer face of the peripheral wall (5), means for releasably connecting the coating (40) to the container (1) being provided, characterized in that said means of connection consist of a peripheral groove (8) running through the outer face of the peripheral wall (5) of the container (1), opening towards the bottom (4) of the container (1) and being delimited by two walls (51, 81) of parallel appearance respectively formed by an upper strip (51) of the peripheral wall ic (5) of the container (1) adjoining the upper edge (6) and by an outer wall (81) of the peripheral rim (7) facing said strip (51), said groove (8) delimiting an adjusted housing space for an upper edge of the coating (40) of shape adapted to the shape of the groove (8). Packaging suitable for containing food according to claim 1, characterized in that at least the upper strip (51) of the peripheral wall (5) of the container (1) and the outer wall (81) facing said strip (51) are inclined at an angle of between 5 ° and 45 ° with respect to the vertical. Packaging suitable for containing food according to one of the preceding claims, characterized in that the width of the peripheral groove (8) is equal to the thickness of the blank of the outer covering (40). Packaging suitable for containing food according to one of the preceding claims, characterized in that the groove (8) is axially discontinuous. Packaging suitable for containing food according to the preceding claim, characterized in that the groove (8) comprises a succession of slots (33). Packaging suitable for containing food according to the preceding claim, characterized in that the crenellations (33) are trapezoidal in shape, the smallest of the parallel sides of the trapezoids being in alignment with the bottom of the crenellated groove (8). Packaging suitable for containing food according to one of the preceding claims, characterized in that at least one of the walls (51, 81) forming the groove (8) comprises reliefs (30, 31) projecting towards the inside of the throat (8). Packaging suitable for containing food according to the preceding claim, characterized in that the reliefs (30, 31) fit into openings (52) or slots of corresponding shapes made in the upper edge of the coating (40). Packaging suitable for containing food according to Claim 7, characterized in that the reliefs (31) are housed in embossings of corresponding shapes made in the upper edge of the coating (40). Packaging suitable for containing food according to one of the preceding claims, characterized in that the cutout of the blank of the outer covering (40) comprises at least one portion of shape and area equal to the shape and area of the peripheral wall (5) of the container (1). Packaging suitable for containing food according to the preceding claim, characterized in that the blank cutout comprises a portion (45) of shape and area equal to the shape and area of the bottom (4) of the container (1). Packaging suitable for containing food according to one of the preceding claims, characterized in that the container (1) comprises a polygonal bottom (4) and lateral sides forming the peripheral wall (5), and in that the coating (40 ) comprises a bottom (45) of the same polygonal surface as the bottom (4) of the container (1), separated by grooves (46 to 49) of side panels (41 to 44) of surfaces corresponding to the surfaces of the lateral sides of the container (1) including the wall (51) of the groove (8). Packaging suitable for containing food according to the preceding claim, characterized in that at least one relief (32) equips each corner of the groove (8), the side panels (41, 42, 43, 44) of the coating (40) being provided with slots matching the portion of these reliefs (32) present in the groove section (8) of their lateral insertion side (5). Packaging suitable for containing food according to one of the preceding claims, characterized in that the outer wall (81) of the groove belongs to a gutter (18) formed in the peripheral rim (7), of trapezoidal cross section and having an oblique wall (81) having the same inclination as the strip (51) of the peripheral wall (5) of the container (1) which it faces. Packaging suitable for containing food according to the preceding claim, characterized in that the gutter (18) is axially discontinuous. Packaging suitable for containing food according to one of the preceding claims, characterized in that the coating (40) has cutouts. Packaging suitable for containing food according to the preceding claim, characterized in that the peripheral wall (5) of the container (1) has reliefs located at the level of the cutouts of the coating (40), and dimensioned to fit therein.

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