Tray with paperboard base for food display

Abstract

A tray (21) comprising a paperboard base (1) and at least a first wall (3a) and a second wall (3b) formed by a first layer and a second layer, said first and second layers each comprising at least one aperture (6), said second layer of said first wall having a first planar protrusion (12) forming an angle with said first wall comprised between 30° and 90°, arranged to hold a first emboss of a lid, said second layer of said second wall having a second planar protrusion forming an angle with said second wall comprised between 30° and 90° to hold a second emboss of a lid.

Description

TECHNICAL FIELD

[0001] The present invention relates to a tray comprising a paperboard base arranged to engage with a lid.

[0002] For the purposes of the present invention, the term "tray" means a tray, container, receptacle or dish intended to contain a typical food product, the terms being used interchangeably herein.

[0003] The present invention also relates to a tray and lid assembly, a tray blank and a manufacturing method. BACKGROUND

[0004] There are packages for displaying salads or ready meals, usually with a transparent plastic lid. They have the advantage of showing the consumer the dish they can purchase at the counter. Usually, these dishes or trays are made of black or transparent plastic, which is then engaged with a lid also made of plastic, for example PP or transparent PET.

[0005] However, there is a trend in the food industry to reduce the amount of plastic and replace it with paperboard or cellulose-based materials, for example fibres from paper or sugar cane, to reduce the consumption of single-use plastic products.

[0006] Thus, for the purposes of the present invention, the term "paperboard" means a material formed from a cellulose or lignocellulose matrix, for example paperboard, but also includes Stora Enso CKB250 gram paperboard.

[0007] Existing dishes or trays offer many advantages and, given that this is a mature product, they are very well designed to meet the consumer in their use and the supplier or manufacturer who fills them. For example, these plastic containers are easy to stack both when empty and when full, their lid is on top and they are strong enough not to crush the food product. In addition, the lid is usually clipped on to protect the contents of the container sufficiently and also so that it can be easily opened by the consumer.

[0008] There have been some attempts to replace these plastic containers with paperboard containers, but the products currently being developed are still not mature. They are usually complex to manufacture and assemble, or they cannot be stacked full or empty. In other cases, the lid does not fit tightly enough due to the different strengths of paperboard and plastic, or the lid fits too tightly and the container is very difficult to open since interlocking is important for the lid to be fitted, but the low strength of the paperboard wall makes opening complicated without spilling the contents of the tray out of its container or due to the lack of clipping achievable in a paperboard container. SUMMARY

[0009] It is an object of the present invention to overcome the drawbacks of the prior art by providing a tray that is as easy to use as a plastic container but has a paperboard base. More specifically, the present invention provides a tray comprising a paperboard base that is easy to stack when empty and easy to stack once filled, and a lid that is easy to close and stay closed when restocked on a shelf, the lid being strong enough but also easy to open for a consumer to open the contents of the tray.

[0010] To solve this problem, the present invention provides a tray comprising a paperboard base arranged to engage a lid, said base comprising base walls provided with at least three walls extending mainly upward from the base walls, at least a first wall and a second wall of said three walls being formed by a first paperboard layer and a second paperboard layer, said first paperboard layer facing the inner side of the tray, said second paperboard layer facing the outer side of said tray, said second layer of the first wall and said second layer of the second wall comprising at least a first longitudinal through hole and a second longitudinal through hole respectively, the first longitudinal through hole of the first wall being defined by the second layer of paperboard of the first wall, forming at least a top edge and a bottom edge between which a first hole is located, said top edge being located at a distance H1 measured along the height of said first wall from a horizontal plane passing through a straight portion of the upper edge of said first wall, and the second longitudinal through hole of the second layer of the second wall being defined by the paperboard of the second wall, forming at least a top edge and a bottom edge between which a second hole is located, said top edge being located at a distance H2 measured along the height of said second wall from a horizontal plane passing through a straight portion of the upper edge of said second wall, said second layer of the first wall having a first substantially planar protrusion located above said first hole, having a height hi measured between said top edge and a fold line mainly forming said upper edge of said first wall, the height hi being measured along the height of said protrusion, said height hi being greater than said height H1, said first protrusion forming an angle with said first wall that is less than or equal to 90° and greater than 30°, said angle being arranged to keep a first embossing present on an inner surface of a first downwardly extending side wall of a lid wall of the lid, said second layer of the second wall having a second substantially planar protrusion located above said second longitudinal through hole, having a height h2 measured between said top edge and a fold line mainly forming said upper edge of said second wall, the height h2 being measured along the height of said protrusion, said height h2 being greater than said height H2, said second protrusion forming an angle with said second wall that is less than or equal to 90° and greater than 30°, said angle being arranged to keep a second embossing present on an inner surface of a second downwardly extending side wall of a lid wall of the lid.

[0011] It can be seen that the tray according to the application has a first and a second substantially planar protrusion formed during the folding of the side walls due to the deflection of the folding lines which are slotted, half-cut or perforated, under which there are respectively a first and a second hole formed in the second layer of each of the first and second walls. These two protrusions on two different walls, together with the two holes, each of which enables the embossings provided in the lid to be engaged and held firmly. The tray thus formed is also stackable when empty, since the protrusions prevent the trays from sinking into each other when stacked, and also make it easier to separate them for filling. Furthermore, there is no obstacle inside or outside the tray to prevent the trays from being separated when stacked. The fact that the side walls have a double layer also strengthens the tray, which enables it to be stacked when full, and also makes it easier to open, since the side walls do not collapse under the pressure of the consumer who wants to eat. The presence of this double layer with holes in one of the layers under the protrusions strengthens the grip of the lid, and the food remains isolated from the environment outside the tray, since the other layer keeps the product isolated from the outside environment and thus prevents potential contamination.

[0012] For the purposes of the present application, the deflection of the folding lines can comprise a succession of straight segments or curves. Similarly, the holes can be elliptical, oval, rectangular, hexagonal, semilunar or even comprise one or more rounded edges and / or one or more straight edges.

[0013] For the purposes of the present application, the term "base wall provided with at least three walls which extend mainly upwards from the base wall" means that said at least three walls extend laterally upwards with respect to the base wall, either perpendicularly or in a slightly flared manner, so that it is easier to stack a plurality of empty trays one inside the other.

[0014] Preferably, said at least three walls extend laterally upwards with respect to the bottom wall in a slightly flared manner. In this case, the angle formed between the first protrusion and the first wall, or the angle formed between the second protrusion and the second wall, can even be as high as 90°, without preventing the lid from being snapped into place. The upper walls of the first and second substantially planar protrusions formed during the folding of the side walls are thus oriented downwards and enable the embossings of the lid to be guided until they reach the closed position, in which the lid has the embossings engaged under the protrusions which hold the lid in the holes. The downward orientation of the upper walls of the first and second substantially planar protrusions enables the embossings to slide along the walls when the user exerts pressure on the lid to engage the lid with the tray.

[0015] Advantageously, said base wall provided with at least three walls is a base wall provided with 3, 4, 6, 8, 10 or 12 walls.

[0016] It can be seen that the tray according to the application can be triangular, rectangular or square, with a hexagonal, octagonal, decagonal, dodecagonal shape, etc.

[0017] Preferably, according to the application, the tray is rectangular or square, the base wall is thus provided with 4 walls, and the first and second walls face each other, as do the third and fourth walls.

[0018] In an advantageous embodiment of the application, the second layer of the first wall has a third longitudinal aperture delimited by the second layer of paperboard of the first wall, at least a top edge and a bottom edge being located therebetween, the top edge being located at a distance H3 measured along the height of the first wall from the horizontal plane passing through the straight portion of the upper edge of the first wall, the second layer of the first wall having a third substantially planar projection located above the third aperture, having a height h3 measured between the top edge and the fold line mainly forming the upper edge of the first wall, measured along the height of the third projection, the height h3 being greater than the height H3, the third projection forming an angle with the first wall less than or equal to 90° and greater than 30°.

[0019] Thus, the tray according to the application comprises two projections and two apertures located on one of the side walls, in order to reinforce the retention of the lid, which is particularly advantageous for relatively long trays.

[0020] In a further preferred embodiment according to the application, the second layer of the second wall has a fourth longitudinal aperture delimited by the second layer of paperboard of the second wall, at least a top edge and a bottom edge being located therebetween, the top edge being located at a distance H4 measured along the height of the first wall from the horizontal plane passing through the straight portion of the upper edge of the first wall, the second layer of the second wall having a fourth substantially planar projection located above the fourth longitudinal aperture, having a height h4 measured between the top edge and the fold line mainly forming the upper edge of the second wall, measured along the height of the fourth projection, the height h4 being greater than the height H4, the fourth projection forming an angle with the second wall less than or equal to 90° and greater than 30°.

[0021] Thus, the tray according to the application comprises two projections and two apertures located on two side walls, preferably on opposite side walls, in order to reinforce the retention of the lid, which is particularly advantageous for relatively long trays.

[0022] Preferably, according to the application, the first and second walls have respectively a first and a second length, and wherein the first longitudinal through hole of the first wall has a first length and the second longitudinal through hole of the second wall has a second length, the tray being characterized in that the ratio between the first length of the first wall and the first length of the first longitudinal through hole present on the first wall is between 5 and 30, preferably between 7 and 25, preferably between 8 and 15, preferably between 9 and 12, more particularly between 9.8 and 10.8, and the ratio between the second length of the second wall and the second length of the second longitudinal through hole present on the second wall is between 5 and 30, preferably between 7 and 25, preferably between 8 and 15, preferably between 9 and 12, more particularly between 9.8 and 10.8.

[0023] In a particular embodiment of the application, the first and second walls have respectively a first and a second length, and wherein the third longitudinal through hole of the first wall has a third length and the fourth longitudinal through hole of the second wall has a fourth length, the tray being characterized in that the ratio between the first length of the first wall and the third length of the third longitudinal through hole present on the first wall is between 5 and 30, preferably between 7 and 25, preferably between 8 and 15, preferably between 9 and 12, more particularly between 9.8 and 10.8, and the ratio between the second length of the second wall and the fourth length of the fourth longitudinal through hole present on the second wall is between 5 and 30, preferably between 7 and 25, preferably between 8 and 15, preferably between 9 and 12, more particularly between 9.8 and 10.8.

[0024] In an advantageous embodiment according to the application, the upper edge of the first wall has at least a first inner deflection forming the top edge of the first protrusion.

[0025] In another advantageous embodiment according to the application, the upper edge of the second wall has at least a second inner deflection forming the top edge of the second protrusion.

[0026] In another advantageous embodiment according to the application, the upper edge of the first wall has at least a third inner deflection forming the top edge of the third protrusion.

[0027] In another advantageous embodiment according to the application, the upper edge of the second wall has at least a fourth inner deflection forming the top edge of the fourth protrusion.

[0028] For the purposes of the application, the term "inner deflection" means a deflection of the fold line towards the interior of the tray.

[0029] The present invention also relates to an assembly formed by a tray according to the present invention, said assembly further comprising a lid formed by a lid wall, at least three side walls extending downwardly from said lid wall, said lid comprising said first side wall and said second side wall, said first side wall and said second side wall each having an inner surface provided with a first and a second embossing projecting towards the inner side of said lid, respectively, said first and second embossing being arranged to fit under said first and second projections of said first and second walls of said tray, respectively.

[0030] More specifically, the lid is formed by a lid wall, four side walls extending downwardly from the lid wall, facing each other in pairs. Preferably, the first and second embossing are present on the first side wall and the second side wall facing the first side wall.

[0031] In a particular embodiment of the assembly according to the present invention, the projections form guiding walls for the lid, making it easier to slide the embossing along the substantially planar upper wall of the projections, to interlock the embossing under the corresponding projections, and to retain the embossing in the holes under the projections.

[0032] In a particular embodiment of the assembly according to the present invention, the first and second side walls have a shoulder, so that the lid wall has a smaller cross section than the cross section of the base of the tray. Thus, the lid has a cross section that widens towards the bottom, and the shoulder forms a rim arranged to rest on the edge of the side walls of the tray, so that it can rest on the anti-collapse zone of the tray. The projections on the first and second side walls of the lid then form in the lid portion, from the lid wall, beyond the rim formed by the shoulder, around the side walls of the tray, in order to cooperate with the projections present on the outer side of the first and second walls of the tray, and to be placed in the first and second holes therein.

[0033] More specifically, according to the present invention, said first embossing has a depth P1 of between 0.8 mm and 5 mm, preferably between 1 mm and 3 mm, preferably 2 mm, and wherein said second embossing has a depth P2 of between 0.8 mm and 5 mm, preferably between 1 mm and 3 mm, preferably 2 mm.

[0034] When said tray comprises first and third projections on said first wall and second and fourth projections on said second wall, and first and third holes on said first wall and second and fourth holes on said second wall, said lid comprises first and third embossing on said first wall and second and fourth embossing on said second wall.

[0035] Advantageously, in this case, the third embossing has a depth P3 between 0.8 mm and 5 mm, preferably between 1 mm and 3 mm, preferably 2 mm, and the fourth embossing has a depth P4 between 0.8 mm and 5 mm, preferably between 1 mm and 3 mm, preferably 2 mm.

[0036] The present application also relates to a blank of a paperboard tray having a base portion provided with at least three sides, the at least three sides comprising: at least a first side and a second side; a first portion of a first wall adjacent to the base portion along the first side; a second portion of the first wall adjacent to the first portion of the first wall; a first fold line comprising at least a straight portion arranged to form an upper edge of the first wall of the tray, the second portion of the first wall having a first longitudinal recess having a length LI, the first longitudinal recess arranged to form a first aperture of the first wall, the first fold line further having a first deflection portion in the first portion of the first wall, the length of the first deflection portion being greater than the length LI; and a first portion of a second wall adjacent to the base portion along the second side; a second portion of the second wall adjacent to the first portion of the second wall; a second fold line comprising at least a straight portion arranged to form an upper edge of the second wall of the tray, the second portion of the second wall having a second longitudinal recess having a length L2, the second longitudinal recess arranged to form a second aperture of the second wall, the second fold line further having a second deflection portion in the first portion of the second wall, the length of the second deflection portion being greater than the length L2, the sides of the base portion being fold lines formed by slitting and / or scoring and / or half-cutting of the paperboard.

[0037] In a preferred embodiment according to the application, the blank of the paperboard tray further comprises a first portion of a third wall adjacent to the base portion along the third side, a second portion of the third wall adjacent to the first portion of the third wall, a third fold line between the first portion and the second portion of the third wall, the third fold line being arranged to form an upper edge of the third wall of the tray, the second portion of the third wall having an edge opposite the third fold line and a first lateral edge and a second lateral edge facing each other, the blank further comprising a first tab portion extending from the first lateral edge of the second portion of the third wall and a second tab portion extending from the second lateral edge of the second portion of the third wall, the first tab portion having a connecting edge and a free edge, the connecting edge being connected to the first lateral edge of the second portion of the third wall and forming a fold line formed by a slotting and / or scoring and / or half-cut, the first tab portion further having a third edge and a fourth edge, the third edge and the fourth edge being spaced apart by a distance D1 along the connecting edge and by a distance D2 along the free edge, the distance D1 being greater than the distance D2, the first tab portion being arranged to be introduced between the first portion and the second portion of the first wall, the second tab portion having a connecting edge and a free edge, the connecting edge being connected to the second lateral edge of the second portion of the third wall and forming a fold line formed by a slotting and / or scoring and / or half-cut, the second tab portion further having a third edge and a fourth edge, the third edge and the fourth edge being spaced apart by a distance D3 along the connecting edge and by a distance D4 along the free edge, the distance D3 being greater than the distance D4, the second tab portion being arranged to be introduced between the first portion and the second portion of the second wall.

[0038] More specifically, the blank of a paperboard tray according to the application comprises a base portion comprising 4 sides, said first and second sides being opposite to each other and comprising a fourth side opposite to the third side, said blank further comprising a first portion of a fourth wall along the fourth side adjacent to the base portion, a second portion of the fourth wall adjacent to the first portion of the fourth wall, a fourth fold line between the first and second portions of the fourth wall, the fourth fold line being arranged to form an upper edge of the fourth wall of said tray, said second portion of the fourth wall having an edge opposite to the fourth fold line and a first and a second transversal edge facing each other, the blank further comprising a third tab portion extending from said first transversal edge and a fourth tab portion extending from said second transversal edge of the second portion of the fourth wall, said third tab portion having a connecting edge and a free edge, said connecting edge being connected to said first transversal edge of the second portion of the fourth wall and forming a fold line formed by a slotting and / or scoring and / or half-cut, said third tab portion further having a third edge and a fourth edge, said third and fourth edges being spaced apart by a distance D5 along the connecting edge and by a distance D6 along the free edge, the distance D5 being greater than the distance D6, said third tab portion being arranged to be introduced between the first and second portions of the first wall, said fourth tab portion having a connecting edge and a free edge, said connecting edge being connected to said second transversal edge of the second portion of the fourth wall and forming a fold line formed by a slotting and / or scoring and / or half-cut, said fourth tab portion further having a third edge and a fourth edge, said third and fourth edges being spaced apart by a distance D7 along the connecting edge and by a distance D8 along the free edge, the distance D7 being greater than the distance D8, said fourth tab portion being arranged to be introduced between the first and second portions of the second wall.

[0039] In an advantageous variant, the base portion of the blank according to the application comprises 4 sides, the first and second sides being opposite each other and comprising a fourth side opposite the third side, the blank comprising: a first portion of third wall adjacent to the base portion along the third side; a second portion of third wall adjacent to the first portion of third wall; a third fold line located between the first and second portions of third wall, arranged to form an upper edge of the third wall of the tray, the second portion of third wall having an edge opposite the third fold line and first and second transverse edges facing each other, the blank further comprising: a first portion of fourth wall adjacent to the base portion along the fourth side; a second portion of fourth wall adjacent to the first portion of fourth wall; a fourth fold line located between the first and second portions of fourth wall, arranged to form an upper edge of the fourth wall of the tray, the second portion of fourth wall having an edge opposite the fourth fold line and first and second transverse edges facing each other, the blank further comprising: a first portion of fixing means, for example a first bellows portion, located between the first portion of first wall and the first portion of fourth wall; a second portion of fixing means, for example a second bellows portion, located between the first portion of first wall and the first portion of third wall; a third portion of fixing means, for example a third bellows portion, located between the first portion of second wall and the first portion of fourth wall; and a fourth portion of fixing means, for example a fourth bellows portion, located between the first portion of second wall and the first portion of third wall.

[0040] In an advantageous variant of the application, the first deflection portion has a first portion extending from the first fold line towards the base portion, a second portion substantially parallel to the first fold line and a third portion extending from the second portion and joining the first fold line.

[0041] In another advantageous variant of the application, the second deflection portion has a first portion extending from the second fold line towards the base portion, a second portion substantially parallel to the second fold line and a third portion extending from the second portion and joining the second fold line.

[0042] In yet another advantageous variant of the application, the third deflection portion has a first portion extending from the first fold line towards the base portion, a second portion substantially parallel to the first fold line and a third portion extending from the second portion and joining the first fold line.

[0043] In yet another advantageous variant of the application, the fourth deflection portion has a first portion extending from the second fold line towards the base portion, a second portion substantially parallel to the second fold line and a third portion extending from the second portion and joining the second fold line.

[0044] More particularly, in the blank according to the application, the first fold line has a guide line passing through a straight portion of the first fold line, and wherein the first recess has a point closest to the guide line, the distance between the closest point measured transversely along the second portion of the first wall and the guide line being H1, while the distance between the same point closest to the guide line of the first recess and the most distant point of the deflection is h1 and is greater than H1.

[0045] Preferably, in the blank according to the application, the second fold line has a guide line passing through a straight portion of the second fold line, and wherein the second recess has a point closest to the guide line, the distance between the closest point measured transversely along the second portion of the second wall and the guide line being H2, while the distance between the same point closest to the guide line of the second recess and the most distant point of the deflection is h2 and is greater than H2.

[0046] Advantageously, the second portion of the first wall has a third longitudinal recess having a length L3, the third longitudinal recess being arranged to form a third aperture of the first wall, the first fold line further having a third deflection in the first portion of the first wall, the length of the third deflection being greater than the length L3.

[0047] Likewise advantageously, the second portion of the second wall has a fourth longitudinal recess having a length L4, the fourth longitudinal recess being arranged to form a fourth aperture of the second wall, the second fold line further having a fourth deflection in the first portion of the second wall, the length of the fourth deflection being greater than the length L4.

[0048] The application also relates to a method for manufacturing a paperboard tray according to the application, comprising the following steps:

[0049] cutting the blank according to the application;

[0050] forming fold lines in the base portion by slitting and / or scoring and / or half-cutting along the at least three sides, preferably along the at least four sides;

[0051] making the first, second and third fold lines, preferably the first, second, third and fourth fold lines, by slitting and / or scoring and / or half-cutting;

[0052] gluing on opposite sides of the first portion and / or of the second portion of each of the first, second and third walls, preferably of each of the first, second, third and fourth walls;

[0053] folding a first portion onto a second portion of each of the first, second and third walls, preferably onto a second portion of each of the first, second, third and fourth walls;

[0054] placing in a tray-forming machine to pull each of the first, second and third walls, preferably the first, second, third and fourth walls, upwardly straight;

[0055] assembling the third wall to the first and second walls, preferably assembling the third wall to the first and second walls and assembling the fourth wall to the first and second walls, by:

[0056] flanging a first tab portion of the third wall, preferably also a first tab portion of the fourth wall, so as to bring the first tab portion into contact with the first or second portion of the first wall, and flanging a second tab portion of the third wall, preferably also a second tab portion of the fourth wall, so as to bring the second tab portion into contact with the first or second portion of the second wall, or folding and optionally gluing, when a fourth wall is present, said first, second, third and fourth securing means.

[0057] Preferably, for the purposes of the present invention, bringing the first tab portion of the third wall, preferably also the first tab portion of the fourth wall, into contact with the first or second portion of the first wall means inserting the first tab portion of the third wall, preferably also the first tab portion of the fourth wall, between the first and second portions of the first wall.

[0058] Preferably, for the purposes of the present invention, bringing the second tab portion of the third wall, preferably also the second tab portion of the fourth wall, into contact with the first or second portion of the first wall means inserting the second tab portion of the third wall, preferably also the second tab portion of the fourth wall, between the first and second portions of the first wall. Thus, the first and second tab portions of the third wall, preferably also the first and second tab portions of the fourth wall, form an integral part with the first wall, since the first and second tab portions are introduced into the space between the first and second portions of the first wall by interlocking or by gluing using adhesive introduced at the time of gluing (on the opposite side of the first portion and / or the second portion of each of the first, second to the first wall) or by introducing additional adhesive during an additional gluing step.

[0059] Alternatively, when a fourth wall is present, the walls of said tray are secured by folding and optionally by gluing said first, second, third and fourth securing means.

[0060] Therefore, the first part of the fixing device (e.g., the first corrugated pipe part) is folded and optionally glued to the inner or outer surface of the first or fourth wall; the second part of the fixing device (e.g., the second corrugated pipe part) is folded and optionally glued to the inner or outer surface of the first or third wall; the third part of the fixing device (e.g., the third corrugated pipe part) is folded and optionally glued to the inner or outer surface of the second or fourth wall; and the fourth part of the fixing device (e.g., the fourth corrugated pipe part) is folded and optionally glued to the inner or outer surface of the second or third wall.

[0061] Another example of a fastening device could be a tab portion that does not extend from a second portion of the first, second, third, and optional fourth walls, but rather from a first portion of the first, second, third, and optional fourth walls, for example when the first and second portions of the first, second, third, and optional fourth walls are not at the same height and only partially overlap. Attached Figure Description

[0062] Other features, details and advantages of the invention will become apparent from the following non-limiting description, which is given with reference to the accompanying drawings and embodiments.

[0063] In the attached diagram, Figure 1 This is a perspective view of a cardboard pallet according to the present invention.

[0064] Figure 2 This is a top view of the cover of the component according to the present invention.

[0065] Figure 3 This is a side view of the cover of the component according to the present invention.

[0066] Figure 4 The cover edge of the component according to the invention Figure 3 The cross-sectional view of line AA shown.

[0067] Figure 5 This is a perspective view of the cover according to the present invention.

[0068] Figure 6 This is a top view of the pallet blank according to the present invention.

[0069] Figure 7 yes Figure 6 A magnified view of a portion of the image.

[0070] Figure 8 It is a sectional view along the section line of the first wall, which is taken from the middle of the first protrusion 12.

[0071] In the accompanying drawings, identical or similar items have the same reference numerals. Detailed Implementation

[0072] As Figure 1 illustrated, the tray according to the present application comprises a base 1 of paperboard arranged to engage a lid (not shown). The base 1 comprises a base wall 2 provided with four walls 3a, 3b, 3c, 3d extending mainly upwards from the base wall 2.

[0073] In Figure 1 the illustrated embodiment, all walls 3a, 3b, 3c, 3d are formed by a first layer 4 of paperboard and a second layer 5 of paperboard. However, it is only required that at least a first wall and a second wall are formed by a first layer of paperboard and a second layer of paperboard.

[0074] The first layer 4 of paperboard faces the inner side of the tray and the second layer 5 of paperboard faces the outer side of said tray. The second layer 5 of said first wall 3a and said second wall 3b comprises at least a first longitudinal through hole 6 and a second longitudinal through hole (not visible) respectively. The first longitudinal through hole 6 of the first wall 3a is delimited by the second layer 5 of paperboard of the first wall 3a, thereby forming at least one top edge 7 and one bottom edge 8, the first hole 6 being located between the top edge 7 and the bottom edge 8. Said top edge 7 is positioned at a distance H1 measured from a horizontal plane P passing through a straight portion of an upper edge 9 of said first wall 3a and along a height 10 of said first wall 3a.

[0075] The second longitudinal through hole of the second layer 5 of the second wall 3b is delimited by the paperboard of the second wall 3b forming at least one top edge and one bottom edge, the second hole being located between the top edge and the bottom edge. The top edge (not shown) is positioned at a distance H2 measured from a horizontal plane passing through a straight portion of an upper edge of said second wall 3b and along a height 11 of said second wall 3b. The second layer 5 of said first wall 3a has a first substantially planar protrusion 12 positioned above said first hole 6, the protrusion having a height hi measured between said top edge 7 and a fold line 13 mainly forming said upper edge 9 of said first wall 3a measured along the height of said protrusion 12.

[0076] The height hi is greater than said height H1. The first protrusion 12 forming an angle a (see Figure 8 ) of less than or equal to 90° and greater than 30° with said first wall 3a is arranged to hold a first embossing 15 (see Figure 2 , 3 , 4 and 5), said first embossing 15 being present on an inner surface of a first downwardly extending side wall 16a of a lid wall 17 of a lid 18.

[0077] The second layer 5 of the second wall 3b has a substantially planar second protrusion (not visible) positioned above the second longitudinal through hole (not visible) having a height h2 measured between the top edge and the fold line which mainly forms the upper edge of the second wall, the height being measured along the height of the protrusion. The height h2 is greater than the height H2, the second protrusion forming an angle with the second wall which is less than or equal to 90° and greater than 30°, the angle being arranged to retain a second embossing 15 present on the inner surface of the second downwardly extending side wall 16b of the cover wall 17 of the cover 18.

[0078] Preferably, according to the application, the first wall 3a and the second wall 3b have respectively a first length L and a second length L, and wherein the first longitudinal through hole 6 of the first wall 3a has a first length / and the second longitudinal through hole of the second wall 3b has a second length / , the tray being characterized in that the ratio between the first length L of the first wall 3a and the first length / of the first longitudinal through hole 6 present on the first wall 3a is between 9 and 11, preferably between 9.5 and 10.5, more particularly between 9.8 and 10.2, and the ratio between the second length L of the second wall 3b and the second length / of the second longitudinal through hole present on the second wall 3b is between 9 and 11, preferably between 9.5 and 10.5, more particularly between 9.8 and 10.2.

[0079] According to the application, the upper edge 9 of the first wall 3a has at least a first inner deflection 19 forming the top edge of the first protrusion 12.

[0080] As Figure 2 , 3 , 4 and 5, the cover 18 is formed by a cover wall 17 from which four side walls 16a, 16b, 16c, 16d extend downwardly facing each other, the first and second side walls 16a, 16b each having an inner surface provided with a first and second embossing 15 projecting toward the inner side of the cover 18, respectively, the first and second embossings 15 being arranged to fit respectively under the first protrusion 12 of the first wall 3a of the tray and under the second protrusion of the second wall of the tray.

[0081] At least the first side wall 16a and the second side wall 16b have a shoulder 14 of width x, so that the cover wall 17 has a smaller cross section than the cross section of the base wall 2 of the tray. Thus, the cover 18 has an enlarged cross section towards the bottom and the shoulder 14 forms a rim which is arranged to rest on the edge 9 of the side wall of the tray, so that it can rest on the anti-collapse area of the tray. A debossing 15 is then made on the first and second side walls of the cover 16a, 16b in the cover portion surrounding the side wall of the tray, beyond the rim formed by the shoulder 14, starting from the cover wall 17.

[0082] More particularly, according to the application, the first debossing has a depth P1 of between 0.8 mm and 5 mm, preferably between 1 mm and 3 mm, preferably 2 mm, and wherein the second debossing has a depth P2 of between 0.8 mm and 5 mm, preferably between 1 mm and 3 mm, preferably 2 mm.

[0083] Figure 6 A blank 20 of a paperboard tray 21 is shown, having a base portion 22 provided with at least a first side 24 and a second side 23, a first portion 25 of a first wall 3a adjacent the base portion 22 along said first edge 24, a second portion 26 of the first wall 3a adjacent the first portion 25 of the first wall 3a, a first fold line 27 comprising at least one straight portion 28 arranged to form an upper edge 9 of said first wall 3a of said tray 21.

[0084] The second portion 26 of the first wall 3a has a first longitudinal recess 29 of length LI arranged to form a first aperture 6 of the first wall 3a, the first fold line 27 further having a first deflection 30 in said first portion 25 of the first wall 3a of length T1 greater than the length LI, and a first portion 31 of a second wall 3b adjacent the base portion 22 along said second side 23, a second portion 32 of the second wall 3b adjacent the first portion 31 of the second wall 3b, a second fold line 33 comprising at least one straight portion 34 arranged to form an upper edge 35 of said second wall 3b of said tray 21.

[0085] The second portion 32 of the second wall 3b has a second longitudinal recess 36 of length L2 arranged to form a second aperture of the second wall 3b, the second fold line 33 further having a second deflection 37 in said first portion 31 of the second wall 3b of length T2 greater than the length L2, said sides 23, 24 of the base portion 22 being fold lines formed by slitting and / or scoring and / or half-cutting of the paperboard.

[0086] The blank 20 of the paperboard tray 21 further comprises a first portion 38 of the third wall 3c adjacent to the base portion 22 along a third side 40, a second portion 39 of the third wall 3c adjacent to the first portion 38 of the third wall 3c, a third fold line 41 between the first portion 38 and the second portion 39 of the third wall 3c arranged to form an upper edge of the third wall 3c of the tray 21.

[0087] The second portion 39 of the third wall 3c has an edge 42 opposite the third fold line 41 and a first lateral edge 43 and a second lateral edge 44 facing each other. The blank further comprises a first tab portion 45 extending from the first lateral edge 43 and a second tab portion 46 extending from the second lateral edge 44 of the second portion 39 of the third wall 3c.

[0088] The first tab portion 45 has a connecting edge 47 connected to the first lateral edge 43 of the second portion 39 of the third wall 3c and forming a fold line formed by a slotting and / or scoring and / or half-cut.

[0089] The first tab portion 45 further has a third edge 49 and a fourth edge 50 spaced apart along the connecting edge by a distance D1 and along the free edge by a distance D2, the distance D1 being greater than the distance D2, the first tab portion 45 being arranged to be introduced between the first portion 25 and the second portion 26 of the first wall 3a.

[0090] The second tab portion 46 has a connecting edge 51 connected to the second lateral edge 44 of the second portion 39 of the third wall 3c and forming a fold line formed by a slotting and / or scoring and / or half-cut.

[0091] The second tab portion 46 further has a third edge 53 and a fourth edge 54 spaced apart along the connecting edge 51 by a distance D3 and along the free edge 52 by a distance D4, the distance D3 being greater than the distance D4, the second tab portion 46 being arranged to be introduced between the first portion 31 and the second portion 32 of the second wall 3b.

[0092] The blank 21 of the paperboard tray according to the application further comprises a first portion 55 of the fourth wall 3d adjacent to the base portion 22 along a fourth side 61, a second portion 56 of the fourth wall 3d adjacent to the first portion 55 of the fourth wall 3d, a fourth fold line 57 between the first portion 55 and the second portion 56 of the fourth wall 3d arranged to form an upper edge of the fourth wall 3d of the tray 21.

[0093] The second portion 56 of the fourth wall 3d has an edge 58 opposite the fourth fold line 57 and a first lateral edge 73 and a second lateral edge 62 facing each other. The blank further comprises a third tab portion 60 extending from said first lateral edge 73 and a fourth tab portion 59 extending from said second lateral edge 62 of the second portion 56 of the fourth wall 3d.

[0094] The third tab portion 60 has a connecting edge 63 connected to said first lateral edge 73 of the second portion 56 of the fourth wall 3d and forming a fold line formed by slitting and / or scoring and / or half-cutting.

[0095] The third tab portion 60 further has a third edge 65 and a fourth edge 66 spaced apart along the connecting edge by a distance D5 and along the free edge by a distance D6, the distance D5 being greater than the distance D6, said third tab portion 60 being arranged to be introduced between the first portion 25 and the second portion 26 of the first wall 3a.

[0096] The fourth tab portion 59 has a connecting edge 67 connected to said second lateral edge 62 of the second portion 56 of the fourth wall 3d and forming a fold line formed by slitting and / or scoring and / or half-cutting.

[0097] The fourth tab portion 59 further has a third edge 69 and a fourth edge 70 spaced apart along the connecting edge 67 by a distance D7 and along the free edge 68 by a distance D8, the distance D7 being greater than the distance D8.

[0098] The fourth tab portion 59 is arranged to be introduced between the first portion 31 and the second portion 32 of the second wall 3b.

[0099] The first deflecting portion 30 has a first portion A extending from the first fold line 27 of the base portion 22, a second portion B substantially parallel to the first fold line 27 and a third portion C extending from the second portion B and connecting the first fold line 27.

[0100] The second deflecting portion 37 has a first portion A extending from the second fold line 33 towards the base portion 22, a second portion B substantially parallel to the second fold line 33 and a third portion C extending from the second portion B and connecting the second fold line 33.

[0101] The third deflecting portion 72 has a first portion A extending from the first fold line 27 towards the base portion 22, a second portion B substantially parallel to the first fold line 27 and a third portion C extending from the second portion B and connecting the first fold line 27.

[0102] The fourth deflecting portion 71 has a first portion A extending from the second fold line 33 towards the base portion 22, a second portion B substantially parallel to the second fold line 33 and a third portion C extending from the second portion B and connecting the second fold line 33.

[0103] As Figure 7 illustrated in the illustrated blank, the first fold line 28 has a guide line E passing through the straight portion 28 of the first fold line 27, and wherein the first recess 29 has a point closest to the guide line E, the distance between the closest point measured transversely along the second portion 26 of the first wall 3a and the guide line E is H1, while the distance between the same point of the guide line closest to the first recess 29 and the farthest point of the deflecting portion is h1 and is greater than H1.

[0104] It should be understood that the present application is in no way limited to the above-described embodiments and can be modified without departing from the scope of the present application.

[0105] For example, for the purposes of the present application, it is envisaged in particular embodiments that all walls extending from the base wall comprise at least one longitudinal through hole.

[0106] In particular embodiments, the first and second layers of paperboard of the walls are substantially the same length.

[0107] In particular embodiments, the first and second layers of paperboard of the walls have different lengths, for example, the length of the first layer is greater than the length of the second layer, for example, by a factor of 1.2, 1.5, 2 or 3.

[0108] The fold lines can be formed by a slotting and / or scoring and / or half-cut step.

[0109] In particular embodiments, one or more walls that do not have a longitudinal through hole have a single layer of paperboard. In this embodiment, the tab portion can be located on a wall comprising one or more longitudinal through holes or on a portion of a wall that does not have a longitudinal through hole.

[0110] In one particular embodiment, the walls are secured together by bellows. The non-recessed portion of the blank present at the intersection of the walls is folded and glued to one of the adjacent walls.

Claims

1. A tray (21) comprising a cardboard base (1) arranged to engage a lid (18), said base comprising a base wall (2) provided with at least three walls extending mainly upwardly from said base wall (2), at least a first wall (3a) and a second wall (3b) of said three walls being made of a first layer (4) of cardboard and a second layer (5) of cardboard, said first layer (4) of cardboard facing the interior of the tray and said second layer (5) of cardboard facing the exterior of the tray, said second layer (5) of said first wall (3a) and said second wall (3b) comprising at least a first longitudinal through hole (6) and a second longitudinal through hole, respectively, said first longitudinal through hole (6) of said first wall (3a) being delimited by the second layer (5) of cardboard of said first wall (3a), said second layer of cardboard of said first wall forming at least a top edge (7) and a bottom edge (8), said first longitudinal through hole (6) being located between said top edge and said bottom edge, said top edge (7) being positioned at a distance H1 measured from a horizontal plane passing through a straight portion of an upper edge (9) of said first wall (3a) and along a height (10) of said first wall (3a), and said second longitudinal through hole of said second layer (5) of said second wall (3b) being delimited by the cardboard of said second wall (3b), said second layer of cardboard of said second wall forming at least a top edge and a bottom edge, said second longitudinal through hole being located between said top edge and said bottom edge, said top edge being positioned at a distance H2 measured from a horizontal plane passing through a straight portion of an upper edge (35) of said second wall (3b) and along a height of said second wall, said second layer (5) of said first wall (3a) having a first substantially planar first protrusion (12) positioned above said first longitudinal through hole (6), said first substantially planar first protrusion having a height hi measured between said top edge (7) and a fold line (13) mainly forming said upper edge (9) of said first wall (3a), said height hi being measured along a height of said first protrusion (12), said height hi being greater than said height HI, said first protrusion forming an angle with said first wall (3a) of less than or equal to 90° and greater than 30°, said first substantially planar first protrusion being arranged to retain a first embossing present on an inner surface of a first downwardly extending first side wall (16a) of a lid wall (17) of a lid (18), said second layer (5) of said second wall (3b) having a second substantially planar second protrusion positioned above said second longitudinal through hole, said second substantially planar second protrusion having a height h2 measured between said top edge and a fold line mainly forming said upper edge (35) of said second wall (3b), said height h2 being measured along a height of said second protrusion, said height h2 being greater than said height H2,The second protrusion forms an angle with the second wall of less than or equal to 90° and greater than 30°, the second substantially planar second protrusion being arranged to retain a second embossing present on an inner surface of a second downwardly extending second side wall (16b) of a lid wall (17) of the lid (18).

2. The tray (21) according to claim 1, wherein, The base wall (2) provided with at least three walls is a base wall (2) provided with 3, 4, 6, 8, 10 or 12 walls.

3. The tray (21) according to claim 1 or 2, wherein The base wall (2) is provided with 4 walls and wherein the first wall (3a) and the second wall (3b) face each other.

4. The tray (21) according to claim 3, wherein, The second layer (5) of the first wall (3a) has a third longitudinal through hole delimited by the second layer (5) of paperboard of the first wall (3a), the second layer of paperboard of the first wall forming at least a top edge and a bottom edge, the third longitudinal through hole being located between the top edge and the bottom edge, the top edge being positioned at a distance H3 measured from a horizontal plane passing through the straight portion of the upper edge (9) of the first wall (3a) and along the height (10) of the first wall (3a), the second layer (5) of the first wall (3a) having a third substantially planar third protrusion positioned above the third longitudinal through hole, the third substantially planar third protrusion having a height h3 measured between the top edge and a fold line (13) which mainly forms the upper edge (9) of the first wall (3a), the height h3 being measured along the height of the third protrusion, the height h3 being greater than the height H3, the third protrusion forming an angle with the first wall (3a) which is less than or equal to 90° and greater than 30°.

5. The tray (21) according to claim 4, wherein, The second layer (5) of the second wall (3b) has a fourth longitudinal through hole delimited by the second layer (5) of paperboard of the second wall (3b), the second layer of paperboard of the second wall forming at least a top edge and a bottom edge, the fourth longitudinal through hole being located between the top edge and the bottom edge, the top edge being positioned at a distance H4 measured from a horizontal plane passing through the straight portion of the upper edge (35) of the second wall (3b) and along the height of the second wall (3b), the second layer (5) of the second wall (3b) having a fourth substantially planar fourth protrusion positioned above the fourth longitudinal through hole, the fourth substantially planar fourth protrusion having a height h4 measured between the top edge and a fold line which mainly forms the upper edge (35) of the second wall (3b), the height h4 being measured along the height of the fourth protrusion, the height h4 being greater than the height H4, the fourth protrusion forming an angle with the second wall (3b) which is less than or equal to 90° and greater than 30°.

6. The tray (21) according to claim 1, wherein, The first wall (3a) and the second wall (3b) have respectively a first length L and a second length L, and wherein the first longitudinal through hole (6) of the first wall (3a) has a first length / and the second longitudinal through hole of the second wall (3b) has a second length / , the ratio between the first length L of the first wall (3a) and the first length / of the first longitudinal through hole (6) present on the first wall (3a) being between 5 and 30, and wherein the ratio between the second length L of the second wall (3b) and the second length / of the second longitudinal through hole present on the second wall (3b) is between 5 and 30.

7. The tray (21) according to claim 1, wherein, The upper edge (9) of the first wall (3a) has at least a first inner deflection (19) forming the top edge of the first protrusion (12).

8. The tray (21) according to claim 1, wherein, The upper edge (35) of the second wall (3b) has at least a second inner deflection forming the top edge of the second protrusion.

9. An assembly formed by the tray (21) according to any one of the preceding claims, further comprising a lid (18) made of a lid wall (17) from which at least three side walls extend downwards, the lid comprising the first side wall (16a) and the second side wall (16b), the first side wall (16a) and the second side wall (16b) each having an inner surface provided with a first and a second embossing respectively projecting towards the inside of the lid (18), the first and the second embossing being arranged respectively to fit under the first protrusion (12) of the first wall (3a) of the tray (21) and under the second protrusion of the second wall (3b) of the tray (21).

10. The assembly of claim 9, wherein, The first embossing has a depth P1 between 0.8 mm and 5 mm, and wherein the second embossing has a depth P2 between 0.8 mm and 5 mm. The first embossing has a depth P1 between 0.8 mm and 5 mm, and wherein the second embossing has a depth P2 between 0.8 mm and 5 mm.

11. A blank (20) of a paperboard pallet (21), the blank (20) of a paperboard pallet (21) having: a base portion (22) provided with at least three sides, including at least a first side (24) and a second side (23); a first portion (25) of a first wall (3a) adjacent to the base portion (22) along the first side; a second portion (26) of the first wall (3a) adjacent to the first portion of the first wall (3a); a first fold line (27) comprising at least one straight portion (28) arranged to form an upper edge (9) of a first wall (3a) of the pallet (21), the second portion (26) of the first wall (3a) having a first longitudinal recess (29) having a length LI, the first longitudinal recess (29) being arranged to form a first longitudinal through hole of the first wall (3a), the first fold line (27) further having a first deflection (30) in the first portion (25) of the first wall (3a), the first deflection (30) having a length greater than the length LI; and a first portion (31) of a second wall (3b) adjacent to the base portion (22) along the second side (23); a second portion (32) of the second wall (3b) adjacent to the first portion (31) of the second wall (3b); a second fold line (33) comprising at least one straight portion (34) arranged to form an upper edge (35) of a second wall (3b) of the pallet (21), the second portion (32) of the second wall (3b) having a second longitudinal recess (36) having a length L2, the second longitudinal recess (36) being arranged to form a second longitudinal through hole of the second wall (3b), the second fold line (33) further having a second deflection (37) in the first portion (31) of the second wall (3b), the second deflection (37) having a length greater than the length L2, the sides (23, 24) of the base portion (22) being fold lines formed by slitting and / or scoring and / or half-cutting of the paperboard.

12. The blank (20) of paperboard pallet (21) according to claim 11, further comprising: a first portion (38) of the third wall (3c) adjacent to the base portion (22) along a third side (40); a second portion (39) of the third wall (3c) adjacent to the first portion (38) of the third wall (3c); a third fold line (41) between the first portion (38) and the second portion (39) of the third wall (3c), the third fold line (41) being arranged to form an upper edge of the third wall (3c) of the tray (21), the second portion (39) of the third wall (3c) having an edge (42) opposite the third fold line (41) and a first lateral edge (43) and a second lateral edge (44) facing each other, the blank (20) further comprising: a first tab portion (45) extending from the first lateral edge (43); and a second tab portion (46) extending from the second lateral edge (44) of the second portion (39) of the third wall (3c), the first tab portion (45) having a connecting edge (47) connected to the first lateral edge (43) of the second portion (39) of the third wall (3c) and forming a fold line created by slitting and / or scoring and / or half-cutting, the first tab portion (45) further having a third edge (49) and a fourth edge (50), the third edge (49) and the fourth edge (50) being spaced apart by a distance D1 along the connecting edge (47) and by a distance D2 along the free edge (48), the distance D1 being greater than the distance D2, the first tab portion (45) being arranged to be introduced between the first portion (25) and the second portion (26) of the first wall (3a), the second tab portion (46) having a connecting edge (51) connected to the second lateral edge (44) of the second portion (39) of the third wall (3c) and forming a fold line created by slitting and / or scoring and / or half-cutting, the second tab portion (46) further having a third edge (53) and a fourth edge (54), the third edge (53) and the fourth edge (54) being spaced apart by a distance D3 along the connecting edge (51) and by a distance D4 along the free edge (52), the distance D3 being greater than the distance D4, the second tab portion (46) being arranged to be introduced between the first portion (31) and the second portion (32) of the second wall (3b).

13. The blank (20) of paperboard pallets (21) according to claim 12, wherein, The base portion (22) comprises 4 sides, the first side (24) and the second side (23) being opposite to each other and comprising a fourth side (61) opposite to the third side (40), the blank (20) further comprising: a first portion (55) of a fourth wall (3d) adjacent to the base portion (22) along the fourth side (61); a second portion (56) of the fourth wall (3d) adjacent to the first portion (55) of the fourth wall (3d); a fourth fold line (57) between the first portion (55) and the second portion (56) of the fourth wall (3d), the fourth fold line (57) being arranged to form an upper edge of the fourth wall (3d) of the tray (21), the second portion (56) of the fourth wall (3d) having an edge (58) opposite to the fourth fold line (57) and a first lateral edge (73) and a second lateral edge (62) facing each other, the blank (20) further comprising: a third tab portion (60) extending from the first lateral edge (73); and a fourth tab portion (59) extending from the second lateral edge (62) of the second portion (56) of the fourth wall (3d), the third tab portion (60) having a connecting edge (63) connected to the first lateral edge (73) of the second portion (56) of the fourth wall (3d) and forming a fold line formed by slitting and / or scoring and / or half-cutting, the third tab portion (60) further having a third edge (65) and a fourth edge (66) spaced apart by a distance D5 along the connecting edge (63) and by a distance D6 along the free edge (64), the distance D5 being greater than the distance D6, the third tab portion (60) being arranged to be introduced between the first portion (25) and the second portion (26) of the first wall (3a), the fourth tab portion (59) having a connecting edge (67) connected to the second lateral edge (62) of the second portion (56) of the fourth wall (3d) and forming a fold line formed by slitting and / or scoring and / or half-cutting, the fourth tab portion (59) further having a third edge (69) and a fourth edge (70) spaced apart by a distance D7 along the connecting edge (67) and by a distance D8 along the free edge (68), the distance D7 being greater than the distance D8, the fourth tab portion (59) being arranged to be introduced between the first portion (31) and the second portion (32) of the second wall (3b).

14. The blank (20) of paperboard pallet (21) according to claim 12, wherein, The base portion (22) comprises four sides, the first and second sides being opposite to each other, and comprises a fourth side (61) opposite to a third side (40), the blank comprising: a first portion (38) of a third wall, the first portion (38) of the third wall being adjacent to the base portion along the third side (40); a second portion (39) of the third wall, the second portion (39) of the third wall being adjacent to the first portion of the third wall; a third fold line (41) between the first and second portions of the third wall, the third fold line (41) being arranged to form an upper edge of the third wall of the tray, the second portion of the third wall having an edge opposite to the third fold line and a first lateral edge (43) and a second lateral edge (44) facing each other, the blank further comprising: a first portion (55) of a fourth wall, the first portion (55) of the fourth wall being adjacent to the base portion along the fourth side; a second portion (56) of the fourth wall, the second portion (56) of the fourth wall being adjacent to the first portion of the fourth wall; a fourth fold line (57) between the first portion of the fourth wall and the second portion of the fourth wall, the fourth fold line (57) being arranged to form an upper edge of the fourth wall of the tray, the second portion of the fourth wall having an edge opposite to the fourth fold line and a first lateral edge (73) and a second lateral edge (62) facing each other, the blank further comprising: a first portion of a securing means between the first portion of the first wall and the first portion of the fourth wall; a second portion of the securing means between the first portion of the first wall and the first portion of the third wall; a third portion of the securing means between the first portion of the second wall and the first portion of the fourth wall; and a fourth portion of the securing means between the first portion of the second wall and the first portion of the third wall.

15. The blank (20) of a tray (21) according to claim 12, wherein The first deflecting portion (30) has: a first portion A extending from the first fold line (27) towards the base portion (22); a second portion B substantially parallel to the first fold line (27); and a third portion C extending from the second portion B and connecting the first fold line (27). The second deflecting portion (37) has: a first portion A extending from the second fold line (33) towards the base portion (22); a second portion B substantially parallel to the second fold line (33); and a third portion C extending from the second portion B and connecting the second fold line (33).

16. A blank (20) of a tray (21) according to claim 15, wherein The second deflecting portion (37) has: a first portion A extending from the second fold line (33) towards the base portion (22); a second portion B substantially parallel to the second fold line (33); and a third portion C extending from the second portion B and connecting the second fold line (33). ​ 17. A blank (20) of a tray (21) according to claim 16, wherein, The first fold line (27) has a guide line E through a straight portion (28) of the first fold line (27), and wherein the first longitudinal recess (29) has a point closest to the guide line E, measured transversely along the second portion (26) of the first wall (3a), a distance H1 between the closest point and the guide line E, and a distance h1 between the same point of the guide line E closest to the first longitudinal recess (29) and a farthest point of the deflection, and h1 is greater than H1.

18. A blank (20) of a tray (21) according to claim 17, wherein, The second fold line (33) has a guide line (F) through a straight portion of the second fold line (33), and wherein the second longitudinal recess (36) has a point closest to the guide line (F), measured transversely along the second portion (32) of the second wall (3b), a distance H2 between the closest point and the guide line (F), and a distance h2 between the same point of the guide line closest to the second longitudinal recess (36) and a farthest point of the deflection, and h2 is greater than H2.

19. A blank (20) of a tray (21) according to claim 18, wherein, The second portion (26) of the first wall has a third longitudinal recess having a length L3, the third longitudinal recess being arranged to form a third longitudinal through hole of the first wall, the first fold line (27) further having a third deflection in the first portion of the first wall, the third deflection having a length greater than the length L3.

20. A blank (20) of a tray (21) according to claim 19, wherein, The second portion (32) of the second wall has a fourth longitudinal recess having a length L4, the fourth longitudinal recess being arranged to form a fourth longitudinal through hole of the second wall, the second fold line (33) further having a fourth deflection in the first portion of the second wall, the fourth deflection having a length greater than the length L4.

21. A method for manufacturing a paperboard tray (21) according to any one of claims 1-8, the method comprising the steps of: cutting a blank (20) according to any one of claims 12-19; forming fold lines in the base portion by slitting and / or scoring and / or half-cutting along the at least three side faces; forming the first, second and third fold lines by slitting and / or scoring and / or half-cutting; gluing on opposite sides of the first portion and / or the second portion of each of the first, second and third walls; folding the first portion onto the second portion of each of the first, second and third walls; placing in a tray forming machine to straighten each of the first, second and third walls upwardly; assembling the third wall to the first and second walls by hemming a first tab portion of the third wall to bring the first tab portion into contact with the first or second portion of the first wall, and hemming a second tab portion of the third wall to bring the second tab portion into contact with the first or second portion of the second wall.

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