FR3111874A1 - Plastic packaging with cardboard frame or other 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 coating (40) the cutout 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 connection 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). Figure for abstract: Fig. 3

Description

Plastic packaging with a cardboard frame or other bio-sourced material without gluing.

The present invention relates to packaging, and more particularly to trays and boxes in particular intended 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 material and manufactured in a conventional manner, for example by thermoforming. They then comprise a means of closure, by a lid or by a film, whether sealed or not. So that the manipulations 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 balance sheets associated with them. These balances are notably impacted by waste treatment operations, with the requirement for the most complete recycling possible being a major factor in this. Reducing carbon footprints obviously also has a direct economic impact, with processing costs obviously having an impact on packaging prices, 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 proposed solutions, it is particularly recommended to use an external structure in 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 expected 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 on environmental issues related to recycling. Certain proposed configurations indeed require the cardboard structure to be bonded to the outer walls of the container, which has the effect of making 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 potentially harmful substance for 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 the selective recycling of the packaging problematic, since it is difficult to separate the plastic container from the external reinforcement structure, not to mention the existence of glue residues 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 (transition 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 document WO2015187016 or in that which appears in document FR 2 979 329.

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

All these cardboard structures comprise a bottom and peripheral walls, said walls then comprising sections which overlap during the forming in three dimensions, 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 to each other 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 in material of the cardboard type 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 in 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 substantially reduced at least at the lateral sides, the loss of resistance linked to the reduction in thickness of the plastic sheets being compensated by the outer layer made of a sufficiently rigid material of the type cardboard or other bio-based 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 recto/verso cardboard, but also to make relief embossing on the cardboard during forming, and finally to have a constant stacking pitch . With regard to the plastic packaging, the existence of an external cardboard structure according to the invention has no impact on the design of the possible closure modes, and the packaging can thus be provided with a lid separate, hinged lid, sealable film, stretch 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 of plastic-type material provided with a bottom and a continuous peripheral wall. The upper edge of the peripheral wall opposite the bottom delimits an opening and is provided with a peripheral rim extending radially outwards. The packaging of the invention also comprises an outer covering, the cutout of which is made from a flat blank of recyclable material of the cardboard type and placed in contact with the outer face of the peripheral wall in the assembled state. It also has, in known manner, detachable connecting means of the coating to the container.

According to the invention, said connecting means consist of a peripheral groove traversing the external face of the peripheral wall of the container, opening towards the bottom of the container and being delimited by two walls of parallel appearance respectively constituted by an upper band 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 fitted for an upper edge of the shaped covering adapted to the shape of the groove.

This solution implements a purely mechanical fastening that surrounds the container and can therefore be exerted continuously on the periphery of the packaging. It is in fact a plastic crimp in the upper part of the covering, which holds the covering constituted by the latter in place. The envelope made of cardboard material is shaped to adapt to the volume of the container, and is sandwiched between the two walls of a narrow groove, which results in fact in distributing the stress of fixing the coating to the container all around. Fixing over the entire periphery also 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 the forces due to the peripheral crimping also eliminates the need for more complex mechanical solutions, which are conversely necessary if the detachable fixing takes place only in a few discreet places of the packaging: it is therefore necessary to achieve a higher fixing efficiency therein, if necessary in combination with means for attaching certain parts of the covering 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° relative to the vertical. The slope given to the sides of the container, allowing manufacture by undercut thermoforming of the plastic material, makes it possible to secure the assembly without any additives (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, grips 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 the 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 a slope. lateral. The existence of edges in said corners makes the plastic there, and therefore the undercut, more rigid, so that the maintenance of the cardboard on the plastic is more efficient.

In the present invention, more preferably still, the width of the peripheral groove is equal to the thickness of the blank of the outer covering. There is indeed, 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 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 circumference of the packaging. In other words, whatever shape is intended, the general nature of the groove remains peripheral. Thus, said groove may comprise a succession of slots, the frequency of the crenellation having to remain compatible with the peripheral path requirement.

According to one possible configuration, the slots can be trapezoidal in shape, the smaller of the parallel sides of the trapezoids being in line with the bottom of the crenellated gutter. This specific shape also provides undercuts resulting in reinforcing the crimping and 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 protruding 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 in which they are inserted in fact carry out a sort of riveting. Alternatively, the reliefs can be housed in embossments of corresponding shapes made in the upper edge of the covering, and whose shape they match.

In fact, the cutout of the blank of the outer covering may comprise at least a portion of shape and of surface equal to the shape and to the surface of the peripheral wall of the container. In other words, the covering of the peripheral wall can be entirely covering and only comprise sections or portions which do not overlap when they are in contact with it. Additionally, the blank of the blank may comprise a portion of shape and surface equal to the shape and surface 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 appropriate provided with means of mutual attachment, makes it possible to use a flat model for cutting the covering which is as simple as possible, easy to manufacture and use, saving on cardboard surface.

When the container comprises a polygonal bottom, for example rectangular, and lateral sides forming the peripheral wall, the coating can for example in practice comprise a polygonal bottom of the same surface as the bottom of the container, separated by creases 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 level of the corners: at least one relief protruding from the wall of the container can equip each corner of the throat, 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 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 closure of a cover, for example by clipping a peripheral section of a cover into a gutter of corresponding shape made in the peripheral edge 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 an oblique wall of the same inclination as the peripheral wall portion of the container which it faces. The parallelism of the two walls of the groove is found well 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 accomplished.

In certain packaging configurations, said gutter may be provided axially discontinuous. These include, for example, packaging without attached 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 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 above, the coating may have cutouts, for example simple geometric figures, having a first 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, 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 also reinforce its attachment to the container if necessary.

Thus, secondarily, it is possible, for example, to provide that the peripheral wall of the container has reliefs located at the level of the cutouts of the coating, and sized to be inserted therein. In this case, an additional blocking of said peripheral coating is carried out according to 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 will follow relating to embodiments which are given only by way of indicative and non-limiting examples.

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

shows a perspective top view of a filmable packaging according to the invention;

shows, in sectional view, the same packaging;

illustrates the operation of the peripheral groove in the version of Figures 1 and 2;

illustrates a cardboard liner cutout for such packaging, in elevational view;

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;

shows the same packaging, in perspective view from the bottom side;

shows, in sectional view, the packaging of FIGS. 5 and 6;

illustrates an enlarged detail, in section view, at the level of the peripheral groove carrying out the crimping of the cardboard covering;

shows, in perspective view from above, a variant of packaging with a lid with a peripheral closure gutter, the lid being shown in the open position;

shows the same packaging, in perspective view from below;

illustrates, in section view, the variant of Figures 9 and 10, the cover being shown in the closed position;

shows an enlargement of a section of the same packaging at the level of the peripheral groove performing the crimping of the cardboard covering, the lid being shown in the closed position;

shows a similar enlargement, on the hinge side, with the cover in the open position;

shows, in perspective view, a variant of the packaging of FIGS. 1 to 3 with a groove with reliefs in studs/cupules protruding inside said groove and cooperating with circular orifices/embossments made in the upper edge of the sides of the coating;

shows the same package in sectional view;

is an enlargement of the section of the peripheral groove of such a packaging with reinforcement of the attachment of the cardboard covering by through studs cooperating with orifices in the upper edge of the sections of the covering;

shows the same enlargement of the section of the peripheral groove, the reinforcement of the setting being carried out by pairs of cupules/rounded embossments;

shows a variant of the packaging of Figures 1 to 3 with corner reliefs;

illustrates a variant with a discontinuous castellated groove;

shows the same package in sectional view; And

shows an enlarged detail, in perspective view, of such castellated discontinuous throat packaging.

Referring 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 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 ) de facto hugs the outer 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 connecting edges of the bottom 4/peripheral wall 5 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 specifically, 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 in fact constituting a groove 8 of width equal to the thickness of each cardboard side 41, 43 of the coating 40. Over the entire periphery of the packaging, the cardboard coating 40 is therefore clamped in the peripheral groove 8, and therefore mechanically well held over the entire circumference 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 covering 40 (see ) is in fact made from a flat blank cut and grooved so that the bottom 45 and the sections 41 to 44 constituting the lateral sides are separated by creases 46 to 49 which constitute the fold lines between them. There is, contrary to the solutions of the prior art, no mechanical means of mutual fixing of the sections 41 to 44, for example via lugs/incisions connections or by gluing, which would require in all cases 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, since 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 stiffness of the container in this region. This undercut, in practice at an angle of 5° and 45°, substantially improves the securing of the cardboard covering 40 as shown in 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, which is less significant given the degree of inclination of the oblique face, which is parallel to the sides 5 side.

This vertical component oriented upwards materializes the stresses applied to the outer covering 40 with a view to maintaining it in the peripheral groove 8. These figures also show that the covering 40, which hugs the entire bottom 4 and 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 package.

Figures 5 to 8 show a packaging configuration without a lid but closed by a sealed film on the peripheral rim 17 of the container 1, which requires a surface of appropriate 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 flange 17 and the lateral sides 5 of the peripheral wall of the container 1. What appears as a discontinuous gutter in turns out in practice to create terminals delimiting the external part of the groove 8, as visible in , creating de facto an outer wall 81 of discontinuous groove 8.

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

The closing cap of the packaging, not shown, is fixed over the entire periphery of the container 1, over the entire available flat rim area 17 . The fastening of the peripheral coating 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 along the circumference of the package, however discontinuously. Given the fixing constraints necessary to retain the coating in the groove 8, this method of fixing is however entirely appropriate, the peripheral distribution of the forces being admittedly less successful but largely sufficient.

The packaging configuration of Figures 9, 10 and 11 has a hinged lid 2 able to close elastically on the container 1, using homologous 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 domed lid 2, similar in shape 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 of the profile 21 allow a connection with elastic engagement adjusted from one to the other, a clipping resulting in the flanges 7 and 20 being in contact or almost in contact with one of the 'other. In this configuration, the domed lid 2 defines an additional volume for the packaging when it is closed.

Figures 12 and 13 show, in section, the mechanical fixing of the coating 40 to the container 1 in the solution with the lid of Figures 9, 10 and 11. It obeys the same crimping diagram as the fixing methods of the previous variants, and is therefore made 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 belongs in this case to the gutter 18, of evenly 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 produce a groove 8 of uniform width in the depth as much as on the whole of the periphery, width which is provided to ensure the fixing of the coating in a uniformly distributed manner over the periphery of the container. This same trapezoidal shape makes it possible at the same time to ensure a lid closure with much better mechanical strength.

The configuration of figures 14 to 16 repeats that of the , with the addition of reliefs protruding from the walls 51, 81 of the groove 8 towards the inside in order to reinforce the attachment of the coating 40 to the container 1. More specifically, studs 30 opposite (see below ) projecting respectively 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 ), the studs 30 can be replaced by cups 31 in the shape of portions of spheres which exert a constraint in recesses of corresponding shape stamped or stamped at the corresponding locations in the upper edge of the coating 40.

The variant of the comprises reliefs 32 made in the corners of the container, which retain the panels 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 flange 7: said groove 8 is therefore not continuous but interrupted by slots 33 regularly spaced. Thus, in the cross section of the , the upper left part shows the face 41 of the covering inserted in the groove 8 whereas in the upper right part, the section is at the level of a slot and the face 43 therefore does not include a part inserted into a groove at this location . Given 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 due to the trapezoidal shape of the slots, which create an effect additional undercut.

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

Claims (17)

Packaging in particular suitable for containing foodstuffs comprising on the one hand a container (1) 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 coating (40) whose cutout 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 covering (40) to the container (1) being provided, characterized in that the said means for 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 constituted 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 a fitted 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 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 slots (33) are trapezoidal in shape, the smaller 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 inwards from the throat (8). Packaging suitable for containing food according to the preceding claim, characterized in that the reliefs (30, 31) are inserted into orifices (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 embossments 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 blank of the outer covering (40) has at least one portion of shape and surface equal to the shape and surface of the peripheral wall (5) of the container (1). Packaging suitable for containing food according to the preceding claim, characterized in that the cutout of the blank comprises a portion (45) of shape and surface equal to the shape and surface 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) from 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 marrying the portion of these reliefs (32) present in the groove section (8) of their lateral side (5) of insertion. Packaging suitable for containing foodstuffs according to one of the preceding claims, characterized in that the outer wall (81) of the groove belongs to a gutter (18) made in the peripheral flange (7), of trapezoidal cross-section and having a oblique wall (81) of 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 sized to be inserted therein.