EP3932822B1 - Plastic packaging with framework made from cardboard or another bio-sourced material without gluing - Google Patents

Description

The present invention relates to packaging, and more particularly to trays and boxes particularly intended to contain food. These packages present 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 film, sealed or not. So that the handling of these packages, when they are filled, is 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 thickness of the walls which delimit it .

However, we generally seek to reduce the quantities of plastic used, in particular with a view to reducing the so-called carbon footprint associated with them. These balance sheets are particularly impacted by waste treatment operations, with the requirement for the most thorough recycling possible being a major part of this. Reducing carbon footprints obviously also has a direct economic impact, with processing costs obviously having an impact on the prices of packaging, which consumers ultimately bear.

For these reasons, the packaging industry is seeking to reduce the quantity of plastic used in the manufacture of trays, boxes and other containers. Among the solutions proposed, it is particularly 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 deficit 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 present multiple disadvantages, firstly in terms of the manufacturing process, but also in terms of environmental issues linked to recycling. Certain configurations proposed require gluing of the cardboard structure. on the external walls of the container, which has the effect of making manufacturing more complex, and therefore more expensive. This is for example the case of the configuration described in the document WO2015187016 . A second disadvantage of this solution relates 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 least makes problematic, the selective recycling of the packaging because it is difficult to separate the plastic container from the external reinforcing structure, without even mentioning the existence of glue residue on one or the other element in the event of separation.

In an attempt to find an answer to these questions, some solutions do not have glue between the plastic container and the cardboard structure, but the latter must be preformed (going 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 each other to give it the three-dimensional shape. This is particularly the case in the solution described in the document WO2015187016 or in that which appears in the document FR 2 979 329 .

In other cases, however, this three-dimensional preforming can do without glue and simply result from the initial design of a flat cardboard blank having cuts and creases allowing folding and three-dimensional assembly, as is the case. case for example of the configuration described in the document WO9323297 .

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

The invention proposes a considerably simplified solution to achieve the same result, with a double 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 , therefore, much more easily integrated into an industrial automatable manufacturing line. The finished product is a bi-material packaging, typically plastic, guaranteeing food safety, reinforced with cardboard, requiring no gluing operation and allowing easy separation of the two elements so that sorting and recycling pose no problem . The packaging obtained is rigid although the thicknesses of plastic are significantly reduced at least at the level of the lateral sides, the loss of strength 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 numerous 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 carry out relief embossing on the cardboard during forming, and finally to have a constant stacking pitch. . With regard to plastic packaging, the existence of an external cardboard structure according to the invention has no impact on the design of the possible closing methods, and the packaging can thus be fitted with a lid. separated, a hinged lid, a sealable film, a stretch closure film etc...

In fact, to summarize, the packaging of the invention, in particular capable of 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 exterior covering, the cutout of which is made from a flat blank of recyclable cardboard-type material and placed in contact with the exterior face of the peripheral wall in the assembled state. It also has, in a known manner, means for detachably connecting the covering to the container.

According to the invention, said connecting means consist of a peripheral groove running along the external face of the peripheral wall of the container, opening towards the bottom of the container and being delimited by two parallel walls respectively constituted 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 covering of 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 crimp in the upper part of the covering, which holds the covering made up of the latter in place. The cardboard material envelope is shaped to adapt to the volume of the container, and is enclosed between the two walls of a narrow groove, which effectively distributes the stress of fixing the covering to the container all around. Fixing over the entire periphery does not require three-dimensional conforming of the coating 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 peripheral crimping also eliminates the need for more complex mechanical solutions, which are conversely necessary if the detachable fastener only takes place in a few discrete places on the packaging: it is therefore necessary to achieve a higher fixing efficiency, where appropriate in combination with means of attaching certain parts of the covering together, or by providing additional mechanical fixing means.

This is for example the case of EP 0 577 634 , which proposes fixing the cardboard covering to the four corners of the packaging, which is however not sufficient and requires the addition of studs, to therefore be provided upstream on the plastic container, to complete the fixing. This is carried out by inserting said studs into corresponding orifices in the covering, also to be provided for in the design and whose location must be calculated to come in front of the studs. The solution presented is therefore much more complex to implement.

Moreover GB 1 264 811 A also discloses packaging according to the preamble of claim 1.

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° relative to the vertical. The slope given to the sides of the container, allowing manufacturing by undercut thermoforming of the plastic material, makes it possible to hold the whole together without any additive (glue, lacquer, etc.). It also facilitates the separation of the two elements in an easy manner with a view to recycling each of the elements. In fact, the plastic container, thanks to its thermoformability, encloses the upper part 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 undercuts is particularly effective in the corners, where a natural reinforcement takes place due to the existence of undercuts in two different directions, in the hypothesis of polygonal containers with slope lateral. The existence of edges in said angles makes the plastic, and therefore the undercut, more rigid, so that the retention 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 overlapping portions when the coating is in contact with the packaging, thus creating extra thicknesses and requiring the use of a surface of cardboard greater than the surface of the packaging to be covered.

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

According to a 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 to reinforce the crimp and guarantee 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 reinforcing the quality and durability of the setting. According to one possibility, these reliefs can be inserted into orifices or slots of corresponding shapes made in the upper edge of the covering. In this case, the reliefs and the orifices into which they are inserted actually carry out a sort of riveting. Alternatively, the reliefs can be housed in embossings of corresponding shapes made in the upper edge of the covering, and of which they match the shape.

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

When the container has a polygonal bottom, for example rectangular, and lateral sides forming the peripheral wall, the covering can for example in practice include a polygonal bottom of the same surface as the bottom of the container, separated by grooves of side panels of surfaces equal to the surfaces of the lateral sides of the container including the wall of the throat.

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

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

Thus, according to a possible configuration, the exterior wall of the groove can belong to a gutter of trapezoidal cross section, which has an oblique wall of the same inclination as the peripheral wall portion of the container to which it faces. The parallelism of the two walls of the groove is clearly found in this configuration, and the distance from the wall of the gutter to the peripheral wall of the container is planned to be of the same order of magnitude as the thickness of the cardboard blank from which the covering is accomplished.

In certain packaging configurations, said gutter can be provided axially discontinuous. These include, for example, packaging without attached lids, those which are sealed with a film sealed on the edges of the container. In such a scenario, the edges of the container serve as a fixing support. An axially discontinuous gutter reinforces the rigidity of the sealing surface. It is therefore planned not to run the gutter continuously, but to interrupt it regularly.

According to a possibility applicable to all the packaging configurations presented previously, the covering can have cutouts, for example simple geometric figures, having a primary decorative purpose and allowing in particular 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 decorative or information purposes, by printing on the faces of the covering, cutting out multiple shapes, producing decorative stampings, etc. . In fact, the side walls of the cladding can benefit from all kinds of treatments allowing a more pronounced marketing effect, which can also, if necessary, strengthen its attachment to the container.

Thus, secondarily, it can for example be provided that the peripheral wall of the container has reliefs located at the level of the cutouts in the covering, and sized to fit there. In this case, additional blocking of said peripheral covering is carried out in an orientation parallel to the sides of the container, in the direction of the bottom thereof.

Other aims and advantages of the present invention will appear 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.

Understanding this description will also be made easier by referring to the appended drawings, which represent configurations of the invention, and in which:

• There figure 1 represents a top perspective view of a filmable packaging according to the invention;
• There figure 2 shows, in section view, the same packaging;
• There Figure 3 illustrates the operation of the peripheral groove in the version of figures 1 and 2 ;
• There Figure 4 illustrates a cutout of cardboard covering for such packaging, in elevation view;
• There Figure 5 represents 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;
• There Figure 6 shows the same packaging, in perspective view from the bottom side;
• There figure 7 shows, in sectional view, the packaging of figures 5 And 6 ;
• There figure 8 illustrates an enlarged detail, in section view, at the level of the peripheral groove crimping the cardboard covering;
• There Figure 9 represents, in perspective view from above, a variant of packaging with a lid with a peripheral closing gutter, the lid being shown in the open position;
• There Figure 10 shows the same packaging, in perspective view from below;
• There Figure 11 illustrates, in sectional view, the variant of figures 9 and 10 , the cover being shown in the closed position;
• There Figure 12 shows an enlargement of a section of the same packaging at the level of the peripheral groove crimping the cardboard covering, the cover being shown in the closed position;
• There Figure 13 represents a similar enlargement, hinge side, the cover being in the open position;
• There Figure 14 represents, in perspective view, a variant of the packaging of figures 1 to 3 with a groove with reliefs in studs/cups protruding into the interior of said groove and cooperating with circular orifices/embossments made in the upper edge of the sections of the covering;
• There Figure 15 shows the same packaging in section view;
• There Figure 16 is an enlargement of the section of the peripheral groove of such packaging with reinforcement of the connection of the cardboard covering by through studs cooperating with orifices in the upper edge of the sections of the covering;
• There Figure 17 shows the same enlargement of the section of the peripheral groove, the reinforcement of the setting being carried out by pairs of rounded cups/embossments;
• There Figure 18 represents a variant of the packaging of figures 1 to 3 with corner reliefs;
• There Figure 19 illustrates a variant with a discontinuous crenellated groove;
• There Figure 20 shows the same packaging in section view; And
• There Figure 21 represents an enlarged detail, in perspective view, of such a package with a discontinuous crenellated groove.

With reference first to the 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 whose upper edge 6 extends radially outwards by a rim 7 provided with a peripheral groove 8 whose bottom forms the edge 6. The cardboard covering 40 (see in Figure 4 ) in fact matches the external faces of the bottom 4 and the lateral sides 5, the side 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 connection edges of the container 1. The outer edge of said panels 41 to 44 is crimped in the groove 8, between an upper strip 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 rim 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 enclosed in the peripheral groove 8, and therefore mechanically well held around the entire periphery of the container 1. This method of fixing prevents the sides 41 to 44 from having overlapping portions, since there is only room for a single thickness of cardboard in the groove 8.

The cardboard covering 40 (see in figure 4 ) is in fact made from a flat 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. There are, contrary to the solutions of the prior art, no mechanical means of mutually fixing the sections 41 to 44, for example via tab/incision connections or by gluing, which would in all cases require sections or protrusions allowing a more or less partial covering 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, reinforced in the corners of the volume due to the double direction of the slope and the greater resulting container rigidity in this region. This undercut, in practice at an angle of 5° and 45°, significantly improves the joining 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 taking into account 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 covering 40 with a view to maintaining it in the peripheral groove 8. These figures also show that the covering 40, which fits the entirety of the bottom 4 and the side walls 5 of container 1, presents a thickness which makes it capable of 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 appropriate dimensions for the sealing of the cover 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 proves in practice to create terminals delimiting the external part of the groove 8, such as visible in Figure 6 , creating de facto an external wall 81 with a discontinuous groove 8.

The gutter 18 is particularly designed to be 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 bottom 4 is extended by a peripheral skirt 20 having an appearance perpendicular to said bottom 4.

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

The packaging configuration of figures 9, 10 And 11 presents an articulated cover 2 capable of closing elastically on the container 1, using matching profiles which clip into each other. The cover 2 and the container 1 are connected by a hinge 3 in one piece with these two volumes. The profile which equips the peripheral rim 7 of the container 1 takes the form of a gutter 18 of a section substantially equivalent to that of the previous variant, but continuous.

The curved cover 2, of shape similar to that of the container 1, comprises a homologous rim 20 provided with a peripheral profile 21 whose shape is dimensionally very close to that of the gutter 18, and which is intended to be housed there. The respective dimensions of the gutter 18 and the profile 21 allow a connection with adjusted elastic engagement of one into the other, clipping resulting in the edges 7 and 20 being in contact or almost in contact with one of the 'other. In this configuration, the curved 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 coating 40 to the container 1 in the lid solution of the figures 9, 10 And 11 . It follows the same crimping pattern as the fixing methods of the previous variants, and is therefore done at the level of the upper edge of the sections 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 layout, precisely so that one of its walls 81 is oriented parallel to a lateral side 5 in order to create a groove 8 of uniform width in the depth as much as over the entire the periphery, width which is intended to ensure the fixing of the coating in a uniform manner distributed around the perimeter of the container. This same trapezoidal shape simultaneously ensures a lid closure with much better mechanical strength.

The configuration of figures 14 to 16 takes up that of the figure 1 , with the addition of reliefs protruding from the walls 51, 81 of the groove 8 towards the inside in order to reinforce the connection of the covering 40 to the container 1. More precisely, the studs 30 facing each other (see in 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 retaining said covering in the groove 8. These additional retention means add to the effect undercut mentioned before. Alternatively (see Figure 17 ), the studs 30 can be replaced by cups 31 in the shape of portions of spheres which exert a stress in stamped recesses of corresponding shape or stamped at the corresponding locations in the upper edge of the covering 40.

The variant of the 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 , comprises a crenellated groove 8 overhanging the rim 7: said groove 8 is therefore not continuous but interrupted by regularly spaced slots 33. Thus, in the cross section of the Figure 20 , the upper left part shows the section 41 of the covering inserted in the groove 8 while in the upper right part, the section is at the level of a niche and the section 43 therefore does not have a part inserted in a groove at this location . Taking into account the fixing constraints necessary to retain the covering 40 in the groove 8, this method of fixing is however entirely appropriate, the peripheral distribution of the forces being largely sufficient in particular due to the trapezoidal shape of the slots, which create an effect additional undercut.

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

Claims (17)

1. Packaging, in particular suitable for containing foodstuffs, comprising a container (1) made of plastics material provided with a base (4) and a continuous peripheral wall (5), the upper edge (6) of the peripheral wall (5) opposite the base (4) delimiting an opening and being provided with a peripheral rim (7) extending radially outward, and an outer covering (40) cut from a planar blank made of recyclable cardboard material and arranged in contact with the outer face of the peripheral wall (5), means being provided for detachably connecting the covering (40) to the container (1), said connecting means consisting of a peripheral groove (8) delimiting a housing space which fits an upper edge of the covering (40) of which the shape is adapted to the shape of the groove (8), characterized in that said peripheral groove (8) runs along the outer face of the peripheral wall (5) of the container (1), opens toward the base (4) of the container (1) and is delimited by two parallel walls (51, 81) each formed by an upper strip (51) of the peripheral wall (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).
2. Packaging suitable for containing foodstuffs 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.
3. Packaging suitable for containing foodstuffs according to either 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).
4. Packaging suitable for containing foodstuffs according to any of the preceding claims, characterized in that the groove (8) is axially discontinuous.
5. Packaging suitable for containing foodstuffs according to the preceding claim, characterized in that the groove (8) comprises a succession of notches (33).
6. Packaging suitable for containing foodstuffs according to the preceding claim, characterized in that the notches (33) are trapezoidal, the smallest of the parallel sides of the trapezoids aligning with the base of the notched groove (8).
7. Packaging suitable for containing foodstuffs according to any of the preceding claims, characterized in that at least one of the walls (51, 81) forming the groove (8) comprises raised portions (30, 31) projecting toward the inside of the groove (8).
8. Packaging suitable for containing foodstuffs according to the preceding claim, characterized in that the raised portions (30, 31) fit into correspondingly shaped openings (52) or slots provided in the upper edge of the covering (40).
9. Packaging suitable for containing foodstuffs according to claim 7, characterized in that the raised portions (31) are housed in correspondingly shaped embossings provided in the upper edge of the covering (40).
10. Packaging suitable for containing foodstuffs according to any of the preceding claims, characterized in that the blank cutout of the outer covering (40) comprises at least one portion having a shape and surface equal to the shape and surface of the peripheral wall (5) of the container (1).
11. Packaging suitable for containing foodstuffs according to the preceding claim, characterized in that the blank cutout comprises a portion (45) having a shape and surface equal to the shape and surface of the base (4) of the container (1).
12. Packaging suitable for containing foodstuffs according to any of the preceding claims, characterized in that the container (1) comprises a polygonal base (4) and lateral sides forming the peripheral wall (5), and in that the covering (40) comprises a base (45) which has the same polygonal surface as the base (4) of the container (1) and is separated by scoring (46 to 49) of lateral faces (41 to 44) having surfaces corresponding to the surfaces of the lateral sides of the container (1) including the wall (51) of the groove (8).
13. Packaging suitable for containing foodstuffs according to the preceding claim, characterized in that at least one raised portion (32) is provided in each corner of the groove (8), the lateral faces (41, 42, 43, 44) of the covering (40) being provided with slots matching the portion of these raised portions (32) present in the groove section (8) of their lateral insertion side (5).
14. Packaging suitable for containing foodstuffs according to any of the preceding claims, characterized in that the outer wall (81) of the groove belongs to a channel (18) provided in the peripheral rim (7), which channel has a trapezoidal cross-section and has an oblique wall (81) of the same inclination as the strip (51) of the peripheral wall (5) of the container (1) which it faces.
15. Packaging suitable for containing foodstuffs according to the preceding claim, characterized in that the channel (18) is axially discontinued.
16. Packaging suitable for containing foodstuffs according to any of the preceding claims, characterized in that the covering (40) has cutouts.
17. Packaging suitable for containing foodstuffs according to the preceding claim, characterized in that the peripheral wall (5) of the container (1) has raised portions located at the cutouts in the covering (40) and dimensioned to be inserted therein.

Images