Tray comprising a cardboard base for displaying food, tray side, method for manufacturing a tray

Abstract

Tray (21) comprising a cardboard base (1) and at least a first wall (3a) and a second wall (3b) formed of a first thickness and a second thickness each having at least one opening (6), said second thickness of said first wall having a first flat projection (12), forming an angle with said first wall between 30° and 90° arranged to retain a first embossing of a lid, said second thickness of said second wall having a second flat projection forming an angle with said second wall between 30° and 90° to retain a second embossing of the lid.

Description

[0001] The present invention relates to a tray comprising a cardboard base arranged to be engaged in a lid.

[0002] The term "plateau" in the context of this invention means a tray, a container, a receptacle, a trough, intended to hold a typically agri-food product, these terms being used interchangeably herein.

[0003] The present invention also relates to a tray and lid assembly, the side of the tray, and the manufacturing process.

[0004] Presentation containers for salads or prepared dishes, typically with transparent plastic lids, are available. These have the advantage of showing consumers the dish they can purchase from the counter. Often, these containers or trays are made of plastic, either black or transparent, and fit into a lid also made of plastic, such as PP or transparent PET.

[0005] However, the trend in the agri-food sector is to reduce the amount of plastic and replace it with cardboard or cellulose-based materials, for example paper-type fibers, sugar cane in order to decrease the consumption of disposable plastic products.

[0006] By the term "cardboard", therefore, in the sense of the present invention, we mean a material made of a cellulosic or lignocellulosic base, such as cardboard for example, but also Stora Enso CKB 250 gram cardboard.

[0007] The existing trays or containers offered numerous advantages, and given that this was a well-established product, they were remarkably well-designed to satisfy both the consumer and the caterer or manufacturer who filled them. These plastic trays, for example, are easily stackable, whether empty or full, and when covered with their lids, they are sturdy enough to prevent crushing the food. Furthermore, the lid is typically clipped on securely to adequately protect the contents of the tray while also allowing for easy opening by the consumer.

[0008] Several attempts have been made to replace these plastic trays with cardboard trays, but the products currently being developed are still immature. They are often complex to manufacture and assemble, or they are difficult to stack when full or empty. In other cases, the lids don't stay on securely because the strength of cardboard and plastic differs, or the lids fit too tightly, making the tray very difficult to open. This is because the lids need to be tightly fitted together, but the weak cardboard walls make opening difficult without spilling the contents, or because there is a lack of grip on the cardboard tray itself.

[0009] Document EP4071067 discloses packaging, particularly for food products, which includes a cardboard tray and a lid placed on the tray when the packaging is closed, with studs in the lid engaging in openings formed in wall sections of at least two opposite side walls of the tray.

[0010] Document FR2656591 relates to a modular and stackable box for various uses, comprising a polygonal base and side walls extending upwards from said base, made by folding the panels of a suitable blank cut from a base sheet of flat material, preferably cardboard, characterized in that the side walls of the box are inclined towards the inside of said box and are each formed by two juxtaposed panels of said blank, on the one hand an internal panel forming an acute angle with the base and an external panel attached to said internal panel and connected to it by a folding edge forming the upper edge of said inclined wall.

[0011] Document WO2014009684 discloses a food container, comprising a container body / tray and a lid. The container body / tray and the lid are held together by protrusions on the lid that engage in openings and flaps provided on the container body / tray.

[0012] US patent 5699959 discloses a container and a snap-on lid in which the container has a peripheral side wall comprising an upper peripheral edge having at least two opposing snap-on zones. Openings are formed in the snap-on zones of the side wall. Folded flaps are connected to the upper portion of the peripheral edge. The flaps have an upper wall portion covering the openings and a lower wall portion attached to the side wall. The upper wall portion is spaced from the side wall to form a hollow space behind the openings. The lid has an upper element and a peripheral rim with projections formed to fit into the openings in the container's side wall and lock the lid onto the container.The present invention aims to overcome the drawbacks of the prior art by providing a tray that offers the same ease of use as a plastic tray, but with a cardboard base. More specifically, the present invention provides a tray with a cardboard base that is easily stackable when empty and stackable when full, and equipped with a lid that is easy to close, remains closed during restocking on shelves, is sufficiently durable, and is also easy for the consumer to open to access the tray's contents.

[0013] To solve this problem, the invention provides a tray according to claim 1 comprising a cardboard base arranged to engage a lid, said base comprising a basal wall provided with at least three walls extending predominantly upwards from the basal wall, at least a first wall and a second wall of the three walls being formed of a first layer of cardboard and a second layer of cardboard, said first layer of cardboard facing the inside of the tray and said second layer of cardboard facing the outside of said tray, said second layer of said first wall and said second wall having at least respectively a first longitudinal through hole and a second longitudinal through hole,said first longitudinal through-hole of the first wall being delimited by the cardboard of the second thickness of the first wall forming at least a top edge and a bottom edge between which the first hole is located, said top edge being positioned at a distance H1 measured from a horizontal plane passing through a straight part of a top edge of said first wall and along the height of said first wall, and said second longitudinal through-hole of the second thickness of the second wall being delimited by the cardboard of the second wall forming at least a top edge and a bottom edge between which the second hole is located, said top edge being positioned at a distance H2 measured from a horizontal plane passing through a straight part of a top edge of said second wall and along the height of said second wall,said second thickness of said first wall having a first substantially flat projection, positioned above said first orifice, having a height h1, measured between said upper edge and a fold line forming predominantly said upper edge of said first wall, measured along the height of said projection, said height h1 being greater than said height H1, said first projection forming an angle with said first wall less than or equal to 90° and greater than 30° arranged to retain a first embossing present on an inner face of a first lateral wall extending downwards from a cover wall of a lid, said second thickness of said second wall having a second substantially flat projection, positioned above said second longitudinal through orifice, having a height h2,measured between said upper edge and a fold line forming predominantly said upper edge of said second wall, measured along the height of said projection, said height h2 being greater than said height H2, said second projection forming an angle with said second wall less than or equal to 90° and greater than 30° arranged to retain a second embossing present on an inner face of a second lateral wall extending downwards from a cover wall of a lid.

[0014] As can be seen, the tray according to the present invention has a first and a second substantially flat projection formed during the folding of the side walls by means of a deviation of the grooved, half-cut, or perforated fold line. Beneath these projections are, respectively, a first and a second opening formed in the second thickness of each of the first and second walls. These two projections, on two different walls, together with the two openings, each allow an embossed section provided in a lid to engage and be held firmly in place. The tray thus formed is also stackable when empty, the projections preventing the trays from sinking into one another when stacked and also facilitating their separation for filling. Furthermore, the tray has no internal or external obstructions that would hinder its separation when stacked.The fact that the side walls are double-layered also reinforces the tray, allowing it to be stacked when full, and makes opening easier because the side walls don't collapse under the pressure of the consumer trying to eat. This double layer, where an opening is made in one layer beneath the protrusions, strengthens the lid's grip, and the food remains isolated from the tray's external environment, since the other layer keeps the product isolated from the outside environment and therefore from potential contamination.

[0015] For the purposes of this invention, the deviation of the fold line may comprise a succession of straight segments or a curve. Similarly, the opening may be oblong, oval, rectangular, hexagonal, crescent-shaped, or have one or more rounded edges and / or one or more straight edges.

[0016] For the purposes of the present invention, the term "basal wall provided with at least three walls extending predominantly upwards from the basal wall" means that said at least three walls extend transversely upwards from the basal wall, either perpendicularly or slightly flared to facilitate the stacking of several empty trays inside one another.

[0017] Preferably, these at least three walls extend transversely upwards from the base wall in a slightly flared manner. In this case, the angle formed between the first projection and the first wall, or the angle formed between the second projection and the second wall, can even be up to 90° without hindering the lid's locking mechanism. This is because the upper walls of the first and second projections, which are substantially flat and formed during the folding of the side walls, are thus oriented downwards, guiding the lid's embossments until they reach a closed position in which the lid presents the embossments engaged beneath the projections that hold it in place, within the openings. The downward orientation of the upper walls of the first and second substantially flat projections allows the embossments to slide along the wall when the user applies pressure to the lid to engage it with the tray.

[0018] Advantageously, said basal wall having at least three walls is a basal wall having 3, 4, 6, 8, 10 or 12 walls.

[0019] As can be seen, the platform according to the present invention can be triangular, rectangular or square in shape, in the form of a hexagon, octagon, decagon, dodecagon,...

[0020] Preferably, according to the present invention, the platform is rectangular or square in shape, said basal wall being thus provided with 4 walls and said first wall and said second wall face each other as well as the third and fourth.

[0021] In an advantageous embodiment of the present invention, said second layer of said first wall has a third longitudinal through-hole delimited by the cardboard of the second layer of the first wall forming at least a top edge and a bottom edge between which the third hole is located, said top edge being positioned at a distance H3 measured from a horizontal plane passing through a straight part of a top edge of said first wall and along the height of said first wall, said second layer of said first wall having a third substantially flat projection, positioned above said third hole, having a height h3, measured between said top edge and a fold line forming predominantly said top edge of said first wall, measured along the height of said third projection,said height h3 being greater than said height H3, said third projection forming an angle with said first wall less than or equal to 90° and greater than 30°.

[0022] Thus, the tray according to the present invention has two projections and two openings on one of the side walls in order to reinforce the retention of the lid, which is particularly advantageous for relatively elongated trays.

[0023] In yet another preferred embodiment according to the present invention, said second layer of said second wall has a fourth longitudinal through-hole delimited by the cardboard of the second layer of the second wall forming at least a top edge and a bottom edge between which is the fourth hole, said top edge being positioned at a distance H4 measured from a horizontal plane passing through a straight part of a top edge of said first wall and along the height of said first wall, said second layer of said second wall having a substantially flat fourth projection, positioned above said fourth longitudinal through-hole, having a height h4, measured between said top edge and a fold line forming predominantly said top edge of said second wall, measured along the height of said fourth projection,said height h4 being greater than said height H4, said fourth projection forming an angle with said second wall less than or equal to 90° and greater than 30°.

[0024] Thus, the tray according to the present invention has two projections and two openings on two of the side walls, preferably on opposite side walls in order to reinforce the retention of the lid, which is particularly advantageous for relatively elongated trays.

[0025] Preferably, according to the present invention, said first wall and said second wall respectively have a first and a second length, and where said first longitudinal through-hole of the first wall has a first length and said second longitudinal through-hole of the second wall has a second length, said platform being characterized in that the proportion between the first length of said first wall to the first length of said 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 in that the proportion between the second length of said second wall to the second length of said 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 specifically between 9.8 and 10.8.

[0026] In a particular embodiment of the present invention, said first wall and said second wall respectively have a first and a second length, and where said third longitudinal through-hole of the first wall has a third length and said fourth longitudinal through-hole of the second wall has a fourth length, said platform being characterized in that the proportion between the first length of said first wall and the third length of said 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 in that the proportion between the second length of said second wall and the fourth length of said 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 specifically between 9.8 and 10.8.

[0027] In an advantageous embodiment according to the present invention, the upper edge of said first wall has at least one first internal deviation forming the upper edge of said first projection.

[0028] In yet another advantageous embodiment according to the present invention, the upper edge of said second wall has at least one second internal deviation forming the upper edge of said second projection.

[0029] In yet another advantageous embodiment according to the present invention, the upper edge of said first wall has at least one third internal deviation forming the upper edge of said third projection.

[0030] In yet another advantageous embodiment according to the present invention, the upper edge of said second wall has at least one fourth internal deviation forming the upper edge of said fourth projection.

[0031] The term "internal deviation" in the context of the present invention means that the folding line is deflected towards the inside of the tray.

[0032] Other embodiments of the platform according to the present invention are indicated in the attached claims.

[0033] The present invention also relates to an assembly according to claim 6 formed by a tray according to the invention, further comprising a lid formed of a cover wall from which extend downwards at least three side walls, the first and second side walls, said first side wall and said second side wall each having an inner face provided respectively with a first and a second embossment projecting inwards said lid arranged to fit respectively under the first projection of the first wall of the tray and under the second projection of the second wall of the tray.

[0034] More specifically, the lid is formed by a cover wall from which four side walls extend downwards, 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.

[0035] In a particular embodiment of the assembly according to the present invention, the projections create a guide wall for the cover, facilitating the sliding of said embossments along the substantially flat upper wall of the projections, their fitting under the corresponding projections and the retention of the embossments in the orifices under the projections.

[0036] In a particular embodiment of the assembly according to the present invention, the first and second side walls have a shoulder, such that the cover wall has a cross-section smaller than that of the base of the tray. The cover thus has a cross-section that widens downwards, and the shoulder creates a lip that is arranged to rest on the edges of the side walls of the tray, thereby resting on a sagging-resistant area of ​​the tray. The embossments on the first and second side walls of the cover, extending beyond the lip formed by the shoulder from the cover wall, are then made in the part of the cover that surrounds the side walls of the tray, so as to cooperate with the projections on the outside of the first and second walls of the tray and to fit into the first and second openings therein.

[0037] More particularly, according to the present invention, said first embossing has a depth P1 between 0.8 and 5 mm, preferably between 1 and 3 mm, preferably 2 mm, and in which said second embossing has a depth P2 between 0.8 and 5 mm, preferably between 1 and 3 mm, preferably 2 mm.

[0038] When the tray has a first and a third projection on the first wall and a second and a fourth projection on the second wall, as well as a first and a third opening on the first wall and a second and a fourth opening on the second wall, the lid has a first and a third embossing on the first wall and a second and a fourth embossing on the second wall.

[0039] In this case, advantageously, said third embossing has a depth P3 between 0.8 and 5 mm, preferably between 1 and 3 mm, preferably 2 mm and the fourth embossing has a depth P4 between 0.8 and 5 mm, preferably between 1 and 3 mm, preferably 2 mm.

[0040] Other embodiments of the assembly according to the present invention are indicated in the attached claims.

[0041] The present invention also relates to a cardboard tray side according to claim 7 having a basal section provided with at least three sides, including at least a first and a second side, a first first wall section adjacent to the basal section, along said first side, a second first wall section adjacent to the first first wall section, a first fold line having at least one straight portion, arranged to form a top edge of said first wall of said tray, said second section of said first wall having a first longitudinal recess of length L1, arranged to form a first opening in the first wall, said first fold line further having a first deviation in said first first wall section, the length of which is greater than length L1, and a first second wall section adjacent to the basal section, along said second side,a second section of the second wall adjacent to the first section of the second wall, a second fold line comprising at least one straight portion, arranged to form a top edge of said second wall of said tray, said second section of said second wall having a second longitudinal recess of length L2, arranged to form a second opening in the second wall, said second fold line further having a second deviation in said first section of the second wall, the length of which is greater than length L2, said sides of said basal section being fold lines formed by scoring and / or perforating and / or kiss-cutting of the cardboard.

[0042] In a preferred embodiment according to the present invention, the cardboard tray side further comprises a first third wall section adjacent to the basal section, along a third side, a second third wall section adjacent to the first third wall section, a third fold line between the first and second third wall sections, arranged to form a top edge of a third wall of said tray, said second third wall section having an edge opposite the third fold line and first and second transverse edges facing each other, the side further comprising a first leg section extending from said first transverse edge and a second leg section extending from said second transverse edge of the second third wall section, said first leg section having a bound edge and a free edge,said bound edge being connected to said first transverse edge of the second section of the third wall and forming a fold line, formed by grooving and / or pricking and / or half-cutting, said first leg section further having a third edge and a fourth edge, said third edge and said fourth edge being spaced at a distance D1 along the bound edge and a distance D2 along the free edge, the distance D1 being greater than the distance D2, said first leg section being arranged to be inserted between the first section and the second section of the first wall, said second leg section having a bound edge and a free edge, said bound edge being connected to said second transverse edge of the second section of the third wall and forming a fold line, formed by grooving and / or pricking and / or half-cutting,said second leg section further having a third edge and a fourth edge, said third edge and said fourth edge being spaced at a distance D3 along the bound edge and a distance D4 along the free edge, the distance D3 being greater than the distance D4, said second leg section being arranged to be inserted between the first section and the second section of the second wall.

[0043] More particularly, the cardboard tray side according to the present invention comprises a basal section having 4 sides, said first and second sides being opposite each other and comprising a fourth side opposite the third side, said side further comprising a first fourth wall section adjacent to the basal section, along a fourth side, a second fourth wall section adjacent to the first fourth wall section, a fourth fold line between the first and second fourth wall sections, arranged to form a top edge of a fourth wall of said tray, said second fourth wall section having an edge opposite the fourth fold line and a first and second transverse edges facing each other,the flank further comprising a third leg section extending from said first transverse edge and a fourth leg section extending from said second transverse edge of the second section of the fourth wall, said third leg section having a bound edge and a free edge, said bound edge being connected to said first transverse edge of the second section of the fourth wall and forming a fold line, formed by grooving and / or pricking and / or half-cutting, said third leg section further having a third edge and a fourth edge, said third edge and said fourth edge being spaced at a distance D5 along the bound edge and a distance D6 along the free edge, the distance D5 being greater than the distance D6, said third leg section being arranged to be inserted between the first section and the second section of the first wall,said fourth leg section having a bound edge and a free edge, said bound edge being connected to said second transverse edge of the second section of the fourth wall and forming a fold line, formed by grooving and / or pricking and / or half-cutting, said fourth leg section further having a third edge and a fourth edge, said third edge and said fourth edge being spaced at a distance D7 along the bound edge and a distance D8 along the free edge, the distance D7 being greater than the distance D8, said fourth leg section being arranged to be inserted between the first section and the second section of the second wall.

[0044] In an advantageous embodiment, the basal section of the flank according to the present invention comprises 4 sides, said first and second sides being opposite each other and comprising a fourth side opposite a third side, the flank comprising a first third wall section adjacent to the basal section, along a third side, a second third wall section adjacent to the first third wall section, a third fold line between the first and second third wall sections, arranged to form a top edge of a third wall of said plate, said second third wall section having an edge opposite the third fold line and a first and second transverse edges facing each other, said flank further comprising a first fourth wall section adjacent to the basal section, along a fourth side, a second fourth wall section adjacent to the first fourth wall section,a fourth fold line between the first and second sections of the fourth wall, arranged to form a top edge of a fourth wall of said plateau, said second section of the fourth wall having an edge opposite the fourth fold line and first and second transverse edges facing each other, the flank further comprising a first section of a fastening means, such as a first bellows section, between the first section of the first wall and the first section of the fourth wall, a second section of a fastening means, such as a second bellows section, between the first section of the first wall and the first section of the third wall, a third section of a fastening means, such as a third bellows section, between the first section of the second wall and the first section of the fourth wall,and a fourth section of means of fastening, such as a fourth section of bellows, between the first section of the second wall and the first section of the third wall.

[0045] In an advantageous embodiment of the present invention, said first deviation has a first segment extending from the first fold line to the basal section, a second segment substantially parallel to the first fold line and a third segment extending from the second segment and joining the first fold line.

[0046] In another advantageous embodiment of the present invention, said second deviation has a first segment extending from the second fold line to the basal section, a second segment substantially parallel to the second fold line and a third segment extending from the second segment and joining the second fold line.

[0047] In yet another advantageous embodiment of the present invention, said third deviation has a first segment extending from the first fold line towards the basal section, a second segment substantially parallel to the first fold line and a third segment extending from the second segment and joining the first fold line.

[0048] In yet another advantageous embodiment of the present invention, said fourth deviation has a first segment extending from the second fold line to the basal section, a second segment substantially parallel to the second fold line and a third segment extending from the second segment and joining the second fold line.

[0049] More particularly, in the side according to the present invention, said first fold line has a guideline passing through the straight part of the first fold line and in which said first recess has a point closest to said guideline, the distance between the closest point and said guideline, measured transversely along said second section of first wall is H1 while the distance between the same closest point of the guideline of said first recess and the furthest point of the deviation is h1 and is greater than H1.

[0050] Preferably, in the side according to the present invention, said second fold line has a guideline passing through the straight part of the second fold line and in which said second recess has a point closest to said guideline, the distance between the closest point and said guideline, measured transversely along said second section of second wall is H2 while the distance between the same closest point of the guideline of said second recess and the furthest point of the deviation is h2 and is greater than H2.

[0051] Advantageously, said second section of said first wall having a third longitudinal recess of length L3, arranged to form a third opening of the first wall, said first fold line further having a third deviation in said first section of first wall, the length of which is greater than the length L3.

[0052] Also advantageously, said second section of said second wall having a fourth longitudinal recess of length L4, arranged to form a fourth opening of the second wall, said second fold line further having a fourth deviation in said first section of second wall, the length of which is greater than the length L4.

[0053] Other embodiments of the side of the platform according to the present invention are indicated in the attached claims.

[0054] The present invention also relates to a method for manufacturing a cardboard tray according to claim 15, comprising the steps of: cutting a side according to the invention, making fold lines of the basal section by grooving and / or pricking and / or kiss-cutting along said at least three sides, preferably along said at least four sides, making said first, second, third fold lines, preferably making said first, second, third and fourth fold lines, by grooving and / or pricking and / or kiss-cutting, gluing the reverse of the first section and / or the second section of each of the first, second and third walls, preferably gluing the reverse of the first section and / or the second section of each of the first, second, third and fourth walls, folding the first section onto the second section of each of the first, second and third walls, preferably folding the first section onto the second section of each of the first, second, third and fourth walls,placing in a tray-forming machine in order to straighten the said first, second and third walls, preferably each of the first, second, third and fourth walls upwards, assembly of the third wall to the first and second walls, preferably of the third wall to the first and second walls and of the fourth wall to the first and second walls, , by folding down the first leg section of the third wall, and preferably also of the fourth wall, so as to bring the first leg section into contact with the first or second section of the first wall, and folding down the second leg section of the third wall, and preferably also of the fourth wall, so as to bring the second leg section into contact with the first or second section of the second wall, or by folding and possibly gluing, when a fourth wall is present, said first, second, third and fourth means of fastening.

[0055] Preferably, in the sense of the present invention, the contacting of the first leg section of the third wall, preferably also of the fourth wall, with the first or second section of the first wall is an insertion of the first leg section of the third wall, preferably also of the fourth wall, between the first and second sections of the first wall.

[0056] Preferably, in the context of the present invention, the contacting of the second tab section of the third wall, and preferably also of the fourth wall, with the first or second section of the first wall is achieved by inserting the second tab section of the third wall, and preferably also of the fourth wall, between the first and second sections of the first wall. The first and second tab sections of the third wall, and preferably also of the fourth wall, are thus made integral with the first wall, as the first and second tab sections are inserted into a space between the first and second sections of the first wall, either by interlocking, or by bonding using the adhesive introduced during the gluing process on the back of the first and / or second section of each of the first and second walls, or by introducing additional adhesive during a further gluing step.

[0057] Alternatively, the walls of the tray are joined together by folding and possibly gluing, when a fourth wall is present, said first, second, third and fourth means of joining.

[0058] Thus the first section of the fastening means, such as the first bellows section, is folded and possibly glued to the inner or outer face of the first or fourth wall, the second section of the fastening means, such as the second bellows section, is folded and possibly glued to the inner or outer face of the first or third wall, the third section of the fastening means, such as the third bellows section, is folded and possibly glued to the inner or outer face of the second or fourth wall, and the fourth section of the fastening means, such as the fourth bellows section, is folded and possibly glued to the inner or outer face of the second or third wall.

[0059] Another example of a section of means of securing could be a leg section which would extend not from the second sections of the first, second, third and possibly fourth walls, but from the first sections of the first, second, third and possibly fourth walls, for example when the first and second sections of the first, second, third and possibly fourth walls are not of the same height and only partially overlap.

[0060] Other embodiments of the process according to the invention are indicated in the attached claims.

[0061] Other features, details and advantages of the invention will become apparent from the description given below, by way of non-limitation and with reference to the drawings and examples.

[0062] In the drawings, the figure 1 is a perspective view of the cardboard tray according to the present invention. There figure 2 is a top view of the lid of the assembly according to the present invention. The figure 3 is a side view of the cover of the assembly according to the present invention. The figure 4 is a cross-sectional view along line AA presented at the figure 3 of the lid of the assembly according to the present invention. The figure 5 is a perspective view of the lid according to the present invention. figure 6 is a top view of the side of the plateau according to the present invention. figure 7 is an enlarged view of part of the figure 6 . There figure 8 is a cross-sectional view along a transverse cutting line of the first wall, taken in the middle of the first projection 12.

[0063] In the figures, identical or analogous elements bear the same references.

[0064] As can be seen at the figure 1 The tray according to the present invention comprises a cardboard base 1 arranged to engage a lid (not illustrated). The base 1 comprises a basal wall 2 provided with four walls 3a, 3b, 3c, 3d which extend predominantly upwards from the basal wall 2.

[0065] In the form of realization illustrated in the figure 1 All walls 3a, 3b, 3c, 3d are formed of a first layer 4 of cardboard and a second layer 5 of cardboard. However, it is only required that at least the first wall and the second wall be formed of a first layer of cardboard and a second layer of cardboard.

[0066] The first cardboard layer 4 faces the inside of the tray, and the second cardboard layer 5 faces the outside of the tray. The second layer 5 of the first wall 3a and the second wall 3b each have at least one 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 cardboard of the second layer 5 of the first wall 3a, forming at least one upper edge 7 and one lower edge 8, between which the first hole 6 is located. The upper 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 the first wall 3a and along the height 10 of the first wall 3a.

[0067] The second longitudinal through-hole of the second layer 5 of the second wall 3b is delimited by the cardboard of the second wall 3b, which forms at least a top edge and a bottom edge between which the second hole is located. The top edge (not shown) is positioned at a distance H2 measured from a horizontal plane passing through a straight portion of a top edge of said second wall 3b and along the height 11 of said second wall 3b. The second layer 5 of said first wall 3a has a first projection 12 that is substantially flat, positioned above said first hole 6, having a height h1, measured between said top edge 7 and a fold line 13 forming predominantly said top edge 9 of said first wall 3a, measured along the height of said projection 12.

[0068] The height h1 is greater than said height H1. The first projection 12 forms an angle a (see figure 8 ) with said first wall 3a less than or equal to 90° and greater than 30° is arranged to retain a first embossing 15 (see figure 2 , 3, 4 et 5 ) present on an inner face of a first lateral wall 16a extending downwards from a cover wall 17 of a lid 18.

[0069] The second thickness 5 of said second wall 3b having a second (not visible) substantially flat projection which is positioned above said second (not visible) longitudinal through-hole, having a height h2, measured between said upper edge and a fold line forming predominantly said upper edge of said second wall, measured along the height of said projection. The height h2 is greater than said height H2, said second projection forming an angle with said second wall, less than 90° and greater than 30° arranged to retain a second embossment 15 present on an inner face of a second lateral wall 16b extending downwards from a cover wall 17 of a lid 18.

[0070] Preferably, according to the present invention, said first wall 3a and said second wall 3b have respectively a first and a second length L, and where said first longitudinal through orifice 6 of the first wall 3a has a first length l and said second longitudinal through orifice of the second wall 3b has a second length l, said platform being characterized in that the proportion between the first length L of said first wall 3a to the first length l of said first longitudinal through orifice 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 in that the proportion between the second length L of said second wall 3b to the second length l of said second longitudinal orifice 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.

[0071] According to the present invention, the upper edge 9 of said first wall 3a has at least one first internal deviation 19 forming the upper edge of said first projection 12.

[0072] As can be seen in figures 2 , 3, 4 et 5 , the lid 18 is formed of a cover wall 17 from which extend downwards four lateral walls 16a, 16b, 16c, 16d, facing each other in pairs, said first lateral wall 16a and said second lateral wall 16b each having an internal face provided respectively with a first and a second embossment 15 projecting inwards said lid 18 arranged to fit respectively under the first projection 12 of the first wall 3a of the tray and under the second projection of the second wall of the tray.

[0073] At least the first 16a and second side walls 16b have a shoulder 14 of width x, such that the cover wall 17 has a cross-section smaller than that of the base wall 2 of the tray. The lid 18 thus has a cross-section that widens downwards, and the shoulder 14 creates a lip that is arranged to rest on the edges 9 of the side walls of the tray, allowing it to rest on an area of ​​the tray that is resistant to sagging. The embossments 15 on the first and second side walls of the lid 16a, 16b, extending beyond the lip formed by the shoulder 14 from the cover wall 17, are then made in the part of the lid that surrounds the side walls of the tray.

[0074] More particularly, according to the present invention, said first embossing has a depth P1 between 0.8 and 5 mm, preferably between 1 and 3 mm, preferably 2 mm and in which said second embossing has a depth P2 between 0.8 and 5 mm, preferably between 1 and 3 mm, preferably 2 mm.

[0075] There figure 6 represents the side 20 of cardboard tray 21 having a basal section 22 having at least a first 24 and a second side 23, a first section 25 of first wall 3a adjacent to the basal section 22, along said first side 24, a second section 26 of first wall 3a adjacent to the first section 25 of first wall 3a, a first fold line 27 having at least a straight part 28, arranged to form an upper edge 9 of said first wall 3a of said tray 21.

[0076] The second section 26 of said first wall 3a having a first longitudinal recess 29 of length L1, arranged to form the first opening 6 of the first wall 3a, said first fold line 27 further having a first deviation 30 in said first section 25 of first wall 3a, the length T1 of which is greater than the length L1, and a first section 31 of second wall 3b adjacent to the basal section 22, along said second side 23, a second section 32 of second wall 3b adjacent to the first section 31 of second wall 3b, a second fold line 33 having at least one straight part 34, arranged to form a top edge 35 of said second wall 3b of said plateau 21.

[0077] The second section 32 of said second wall 3b having a second longitudinal recess 36 of length L2, arranged to form a second opening of the second wall 3b, said second fold line 33 further having a second deviation 37 in said first section 31 of second wall 3b, the length T2 of which is greater than the length L2, said sides 23, 24 of said basal section 22 being fold lines formed by grooving and / or pricking and / or half-cutting of the cardboard.

[0078] The side 20 of the cardboard tray 21 further comprises a first section 38 of third wall 3c adjacent to the basal section 22, along a third side 40, a second section 39 of third wall 3c adjacent to the first section 38 of third wall 3c, a third fold line 41 between the first 38 and the second 39 section of third wall 3c, arranged to form an upper edge of a third wall 3c of said tray 21.

[0079] The second section 39 of the third wall 3c has an edge 42 opposite the third fold line 41 and a first 43 and a second transverse edge 44 facing each other. The flank further comprises a first leg section 45 extending from said first transverse edge 43 and a second leg section 46 extending from said second transverse edge 44 of the second section 39 of the third wall 3c.

[0080] The first leg section 45 having a bound edge 47 and a free edge 48, said bound edge 47 being connected to said first transverse edge 43 of the second section 39 of the third wall 3c and forming a fold line, formed by grooving and / or pricking and / or half-cutting.

[0081] The first leg section 45 further having a third edge 49 and a fourth edge 50, said third edge 49 and said fourth edge 50 being spaced at a distance D1 along the bound edge and a distance D2 along the free edge, the distance D1 being greater than the distance D2, said first leg section 45 being arranged to be inserted between the first section 25 and the second section 26 of the first wall 3a.

[0082] The second leg section 46 having a bound edge 51 and a free edge 52, said bound edge 51 being connected to said second transverse edge 44 of the second section 39 of the third wall 3c and forming a fold line, formed by grooving and / or pricking and / or half-cutting.

[0083] The second leg section 46 further having a third edge 53 and a fourth edge 54, said third edge 53 and said fourth edge 54 being spaced at a distance D3 along the bound edge 51 and at a distance D4 along the free edge 52, the distance D3 being greater than the distance D4, said second leg section 46 being arranged to be inserted between the first section 31 and the second section 32 of the second wall 3b.

[0084] The side 21 of the cardboard tray according to the present invention further comprises a first section 55 of fourth wall 3d adjacent to the basal section 22, along a fourth side 61, a second section 56 of fourth wall 3d adjacent to the first section 55 of fourth wall 3d, a fourth fold line 57 between the first 55 and the second section 56 of fourth wall 3d, arranged to form an upper edge of a fourth wall 3d of said tray 21.

[0085] The second section 56 of the fourth wall 3d has an edge 58 opposite the fourth fold line 57 and a first 73 and a second transverse edge 62 facing each other. The flank further includes a third leg section 60 extending from said first transverse edge 73 and a fourth leg section 59 extending from said second transverse edge 62 of the second section 56 of the fourth wall 3d.

[0086] The third leg section 60 has a bound edge 63 and a free edge 64, said bound edge 63 being connected to said first transverse edge 73 of the second section 56 of the fourth wall 3d and forming a fold line, formed by grooving and / or pricking and / or half-cutting.

[0087] The third leg section 60 further having a third edge 65 and a fourth edge 66, said third edge 65 and said fourth edge 66 being spaced at a distance D5 along the bound edge and a distance D6 along the free edge, the distance D5 being greater than the distance D6, said third leg section 60 being arranged to be inserted between the first section 25 and the second section 26 of the first wall 3a.

[0088] The fourth leg section 59 has a bound edge 67 and a free edge 68, said bound edge 67 being connected to said second transverse edge 62 of the second section 56 of the fourth wall 3d and forming a fold line, formed by grooving and / or pricking and / or half-cutting.

[0089] The fourth leg section 59 further having a third ridge 69 and a fourth ridge 70, said third ridge 69 and said fourth ridge 70 being spaced at a distance D7 along the connected ridge 67 and at a distance D8 along the free ridge 68, the distance D7 being greater than the distance D8.

[0090] The fourth leg section 59 is arranged to be inserted between the first section 31 and the second section 32 of the second wall 3b.

[0091] The first deviation 30 has a first segment A extending from the first fold line 27 of the basal section 22, a second segment B substantially parallel to the first fold line 27 and a third segment C extending from the second segment B and joining the first fold line 27.

[0092] The second deviation 37 has a first segment A extending from the second fold line 33 towards the basal section 22, a second segment B substantially parallel to the second fold line 33 and a third segment C extending from the second segment B and joining the second fold line 33.

[0093] The third deviation 72 has a first segment A extending from the first fold line 27 towards the basal section 22, a second segment B substantially parallel to the first fold line 27 and a third segment C extending from the second segment B and joining the first fold line 27.

[0094] The fourth deviation 71 has a first segment A extending from the second fold line 33 towards the basal section 22, a second segment B, substantially parallel to the second fold line 33 and a third segment C extending from the second segment B and joining the second fold line 33.

[0095] As can be seen at the figure 7 , in the illustrated flank, said first fold line 28 has a guideline E passing through the straight part 28 of the first fold line 27 and in which said first recess 29 has a point closest to said guideline E, the distance between the closest point and said guideline E, measured transversely along said second section 26 of first wall 3a is H1 while the distance between the same closest point of the guideline of said first recess 29 and the furthest point of the deviation is h1 and is greater than H1.

[0096] It is understood that the present invention is in no way limited to the embodiments described above and that many modifications can be made to it without departing from the scope of the attached claims.

[0097] For example, it is envisaged within the meaning of the present invention, in a particular embodiment, that all walls extending from the basal wall have at least one longitudinal through-hole.

[0098] In a particular embodiment, said first layer of cardboard and said second layer of cardboard of a wall have a substantially identical length.

[0099] In a particular embodiment, said first layer of cardboard and said second layer of cardboard of a wall 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, a factor of 1.5, a factor of 2 or a factor of 3.

[0100] The creation of a folding line can be achieved by a grooving step and / or pricking and / or half-cutting.

[0101] In one particular embodiment, the wall(s) without a longitudinal through-hole have a single layer of cardboard. In this embodiment, the leg sections may be located on the walls having one or more longitudinal through-holes or on the wall section without a longitudinal through-hole.

[0102] In one particular embodiment, the walls are joined together using bellows. The unhollowed sections of the side at the intersection of the walls are folded and glued to one of the adjacent walls.

Claims

1. Tray (21) comprising a cardboard base (1) arranged to engage a lid (18), said base comprising a basal wall (2) provided with at least three walls which extend predominantly upwards from the basal wall (2), at least a first wall (3a) and a second wall (3b) of the three walls being made of a second layer (5) of cardboard, said second layer (5) of cardboard facing the outside of said 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 the first wall (3a) being delimited by the cardboard of the second layer (5) of the first wall (3a) forming at least a top edge (7) and a bottom edge (8) between which the first hole (6) is located, 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 the height (10) of said first wall (3a) and said second longitudinal through hole of the second layer (5) of the second wall (3b) being delimited by the cardboard of the second wall (3b) forming at least a top edge and a bottom edge between which the second hole is located, 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 the height of said second wall, characterised in that the first wall and the second wall of the three walls being formed by a first layer (4) of cardboard and said first layer, and said second layer (5) of said first wall (3a) having a first substantially planar projection (12) positioned above said first hole (6), having a height h1, measured between said top edge (7) and a fold line (13) predominantly forming said upper edge (9) of said first wall (3a), measured along the height of said projection (12), said height h1 being greater than said height H1, said first projection forming an angle with said first wall (3a) of less than or equal to 90° and greater than 30° arranged to retain a first embossing (15) present on an inner surface of a first downwardly extending side wall (16a) of a cover wall (17) of a lid (18), said second layer (5) of said second wall (3b) having a second substantially planar projection, positioned above said second longitudinal through hole, having a height h2, measured between said top edge and a fold line predominantly forming said upper edge (35) of said second wall (3b), measured along the height of said projection, said height h2 being greater than said height H2, said second projection forming an angle with said second wall of less than or equal to 90° and greater than 30° arranged to retain a second embossing (15) present on an inner surface of a second downwardly extending side wall (16b) of a cover wall (17) of a lid (18).

2. Tray (21) according to claim 1, wherein said basal wall (2) provided with at least three walls is a basal wall (2) provided with 3, 4, 6, 8, 10 or 12 walls, preferably provided with 4 walls and wherein said first wall (3a) and said second wall (3b) face each other..

3. Tray (21) according to claim 2, wherein said second layer (5) of said first wall (3a) has a third longitudinal through hole delimited by the cardboard of the second layer (5) of the first wall (3a) forming at least a top edge and a bottom edge between which the third hole is located, said top edge being positioned at a distance H3 measured from a horizontal plane passing through a straight portion of an upper edge (9) of said first wall (3a) and along the height (10) of said first wall (3a), said second layer (5) of said first wall (3a) having a third substantially planar projection, positioned above said third hole, having a height h3, measured between said top edge and a fold line (13) predominantly forming said upper edge (9) of said first wall (3a), measured along the height of said third projection, said height h3 being greater than said height H3 said third projection forming an angle with said first wall (3a) of less than or equal to 90° and greater than 30°, and optionally a fourth longitudinal through hole delimited by the cardboard of the second layer (5) of the second wall (3b) forming at least a top edge and a bottom edge between which the fourth hole is located, said top edge being positioned at a distance H4 measured from a horizontal plane passing through a straight portion of an upper edge (35) of said second wall (3b) and along the height of said second wall (3b), said second layer (5) of said second wall (3b) having a fourth substantially planar projection, positioned above said fourth longitudinal through hole, having a height h4, measured between said top edge and a fold line predominantly forming said upper edge (35) of said second wall (3b), measured along the height of said fourth projection, said height h4 being greater than said height H4, said fourth projection forming an angle with said second wall (3b) of less than or equal to 90° and greater than 30°.

4. Tray (21) according to any one of the preceding claims, wherein said first wall (3a) and said second wall (3b) respectively have a first and a second length L, and wherein said first longitudinal through hole (6) of the first wall (3a) has a first length l and said second longitudinal through hole of the second wall (3b) has a second length I, said tray being characterised in that the proportion between the first length L of said first wall (3a) and the first length I of said first longitudinal through hole (6) present on the first wall (3a) is between 5 and 30 and in that the proportion between the second length L of said second wall (3b) and the second length I of said second longitudinal through hole present on the second wall (3b) is between 5 and 30.

5. Tray (21) according to any one of the preceding claims, wherein the upper edge (9) of said first wall (3a) has at least a first inner deflection (19) forming the top edge of said first projection (12) and / or the upper edge (35) of said second wall (3b) has at least a second inner deflection forming the top edge of said second projection.

6. Assembly formed by a tray (21) according to any one of the preceding claims, further comprising a lid (18) made of a cover wall (17) from which at least three side walls extend downwards, including the first (16a) and second side wall (16b), said first side wall (16a) and said second side wall (16b) each having an inner surface respectively provided with a first and a second embossing (15) projecting towards the inside of said lid (18) arranged to fit respectively under the first projection (12) of the first wall (3a) of the tray (21) and under the second projection of the second wall (3b) of the tray (21), preferably said first embossing (15) has a depth P1 of between 0.8 and 5mm, preferably between 1 and 3mm, preferably 2mm, and wherein said second embossing (15) has a depth P2 of between 0.8 and 5mm, preferably between 1 and 3mm, preferably 2mm.

7. Blank (20) of a cardboard tray (21) having a basal section (22) provided with at least three sides, including at least a first (24) and a second side (23), a first section (25) of first wall (3a) adjacent to the basal section (22), along said first side, a second section (26) of first wall (3a) adjacent to the first section of 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), characterised in that said second section (26) of said first wall (3a) having a first longitudinal recess (29) of length L1, arranged to form a first hole of the first wall (3a), said first fold line (27) further having a first deflection (30) in said first section (25) of first wall (3a), the length of which is greater than the length L1, and a first section (31) of second wall (3b) adjacent to the basal section (22), along said second side (23), a second section (32) of second wall (3b) adjacent to the first section (31) of 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), said second section (32) of said second wall (3b) having a second longitudinal recess (36) of length L2, arranged to form a second hole of the second wall (3b), said second fold line (33) further having a second deflection (37) in said first section (31) of second wall (3b), the length of which is greater than the length L2, said sides (23, 24), of said basal section (22) being fold lines formed by grooving and / or scoring and / or kiss-cutting of the cardboard.

8. Blank (20) of a cardboard tray (21) according to claim 7, further comprising a first section (38) of third wall (3c) adjacent to the basal section (22), along a third side (40), a second section (39) of third wall (3c) adjacent to the first section (38) of third wall (3c), a third fold line (41) between the first (38) and the second section (39) of third wall (3c), arranged to form an upper edge of a third wall (3c) of said tray (21), said second section (39) of third wall (3c) having an edge (42) opposite the third fold line (41) and a first (43) and a second transverse edge (44) facing each other, the blank (20) further comprising a first tab section (45) extending from said first transverse edge (43) and a second tab section (46) extending from said second transverse edge (44) of the second section (39) of the third wall (3c), said first tab section (45) having a linked edge (47) and a free edge (48), said linked edge (47) being connected to said first transverse edge (43) of the second section (39) of the third wall (3c) and forming a fold line, formed by grooving and / or scoring and / or kiss-cutting, said first tab section (45) further having a third edge (49) and a fourth edge (50), said third edge (49) and said fourth edge (50) being spaced apart by a distance D1 along the linked edge (47) and by a distance D2 along the free edge (48), the distance D1 being greater than the distance D2, said first tab section (45) being arranged to be introduced between the first section (25) and the second section (26) of the first wall (3a), said second tab section (46) having a linked edge (51) and a free edge (52), said linked edge (51) being connected to said second transverse edge (44) of the second section (39) of the third wall (3c) and forming a fold line, formed by grooving and / or scoring and / or kiss-cutting, said second tab section (46) further having a third edge (53) and a fourth edge (54), said third edge (53) and said fourth edge (54) being spaced apart by a distance D3 along the linked edge (51) and by a distance D4 along the free edge (52), the distance D3 being greater than the distance D4, said second tab section (46) being arranged to be introduced between the first section (31) and the second section (32) of the second wall (3b).

9. Blank (20) of a cardboard tray (21) according to claim 8, wherein the basal section (22) comprises 4 sides, said first (24) and second sides (23) being opposite each other, and comprising a fourth side (61) opposite to the third side (40), said blank (20) further comprising a first section (55) of fourth wall (3d) adjacent to the basal section (22), along a fourth side (61), a second section (56) of fourth wall (3d) adjacent to the first section (55) of fourth wall (3d), a fourth fold line (57) between the first (55) and the second section (56) of fourth wall (3d), arranged to form an upper edge of a fourth wall (3d) of said tray (21), said second section (56) of fourth wall (3d) having an edge (58) opposite the fourth fold line (57) and a first (73) and a second transverse edge (62) facing each other, the blank (20) further comprising a third tab section (60) extending from said first transverse edge (73) and a fourth tab section (59) extending from said second transverse edge (62) of the second section (56) of the fourth wall (3d), said third tab section (60) having a linked edge (63) and a free edge (64), said linked edge (63) being connected to said first transverse edge (73) of the second section (56) of the fourth wall (3d) and forming a fold line, formed by grooving and / or scoring and / or kiss-cutting, said third tab section (60) further having a third edge (65) and a fourth edge (66), said third edge (65) and said fourth edge (66) being spaced apart by a distance D5 along the linked edge (63) and by a distance D6 along the free edge (64), the distance D5 being greater than the distance D6, said third tab section (60) being arranged to be introduced between the first section (25) and the second section (26) of the first wall (3a), said fourth tab section (59) having a linked edge (67) and a free edge (68), said linked edge (67) being connected to said second transverse edge (62) of the second section (56) of the fourth wall (3d) and forming a fold line, formed by grooving and / or scoring and / or kiss-cutting, said fourth tab section (59) further having a third edge (69) and a fourth edge (70), said third edge (69) and said fourth edge (70) being spaced apart by a distance D7 along the linked edge (67) and by a distance D8 along the free edge (68), the distance D7 being greater than the distance D8, said fourth tab section (59) being arranged to be introduced between the first section (31) and the second section (32) of the second wall (3b).

10. Blank (20) of a cardboard tray (21) according to claim 7, wherein the basal section (22) comprises 4 sides, said first and second sides being opposite each other and comprising a fourth side (61) opposite a third side (40), the blank comprising a first section (38) of third wall adjacent to the basal section, along a third side (40), a second section (39) of third wall adjacent to the first section of third wall, a third fold line (41) between the first and the second section of third wall, arranged to form an upper edge of a third wall of said tray, said second section of third wall having an edge opposite the third fold line and a first (43) and a second transverse edge (44) facing each other, said blank further comprising a first section (55) of fourth wall adjacent to the basal section, along a fourth side, a second section (56) of fourth wall adjacent to the first section of fourth wall, a fourth fold line (57) between the first and second section of fourth wall, arranged to form an upper edge of a fourth wall of said tray, said second section of fourth wall having an edge opposite the fourth fold line and a first (73) and second (62) transverse edge facing each other, the blank further comprising a first section of securing means, for example a first bellows section, between the first section of the first wall and the first section of the fourth wall, a second section of securing means, for example a second bellows section, between the first section of the first wall and the first section of the third wall, a third section of securing means, for example a third bellows section, between the first section of the second wall and the first section of the fourth wall, and a fourth section of securing means, for example a fourth bellows section, between the first section of the second wall and the first section of the third wall.

11. Blank (20) of a tray (21) according to one of claims 7 to 10, wherein said first deflection (30) has a first segment A extending from the first fold line (27) towards the basal section (22), a second segment B substantially parallel to the first fold line (27) and a third segment C extending from the second segment B and joining the first fold line (27).

12. Blank (20) of a tray (21) according to one of claims 7 to 11, wherein said second deflection (37) has a first segment A extending from the second fold line (33) towards the basal section (22), a second segment B substantially parallel to the second fold line (33) and a third segment C extending from the second segment B and joining the second fold line (33).

13. Blank (20) of a tray (21) according to any one of claims 7 to 12, wherein said first fold line (27) has a guideline E passing through the straight portion (28) of the first fold line (27) and wherein said first recess (29) has a point closest to said guideline E, the distance between the closest point and said guideline E, measured transversally along said second section (26) of first wall (3a) is H1, whereas the distance between the same point closest to the guideline E of said first recess (29) and the furthest point of the deflection is h1 and is greater than H1, and / or said second fold line (33) has a guideline (F) passing through the straight portion of the second fold line (33) and wherein said second recess (36) has a point closest to said guideline (F), the distance between the closest point and said guideline (F), measured transversally along said second section (32) of second wall (3b), is H2, whereas the distance between the same point closest to the guideline of said second recess (36) and the furthest point of the deflection is h2 and is greater than H2.

14. Blank (20) of a tray (21) according to any one of claims 7 to 13, wherein said second section (26) of said first wall has a third longitudinal recess of length L3, arranged to form a third hole of the first wall, said first fold line (27) further having a third deflection in said first section of first wall, the length of which is greater than the length L3., and / or wherein the second section (32) of said second wall has a fourth longitudinal recess of length L4, arranged to form a fourth hole of the second wall, said second fold line (33) further has a fourth deflection in said first section of second wall, the length of which is greater than the length L4.

15. Method for manufacturing a cardboard tray (21) according to any one of claims 1 to 5, comprising the steps of: - cutting a blank (20) according to any one of claims 7 to 14, - making folding lines in the basal section by grooving and / or scoring and / or kiss-cutting along said at least three sides, preferably along said at least 4 sides, - making said first, second and third folding lines, preferably making said first, second, third and fourth folding lines, by grooving and / or scoring and / or kiss-cutting, - gluing on the reverse side of the first section and / or the second section of each of the first, second and third walls, preferably gluing on the reverse side of the first section and / or the second section of each of the first, second, third and fourth walls, - folding the first section onto the second section of each of the first, second and third walls, preferably folding the first section onto the second section of each of the first, second, third and fourth walls, - placing in a tray forming machine to straighten said first, second and third walls, preferably each of the first, second, third and fourth walls upwards, - assembling the third wall to the first and second walls, preferably the third wall to the first and second walls and the fourth wall to the first and second walls, by hemming the first tab section of the third wall, and preferably also of the fourth wall, so as to bring the first tab section into contact with the first or second section of the first wall and hemming the second tab section of the third wall, preferably also of the fourth wall, so as to bring the second tab section into contact with the first or the second section of the second wall, or by folding and optionally gluing, when a fourth wall is present, said first, second, third and fourth securing means.

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