EP3102494B1 - Tray made from cardboard sheet material for manual assembly and blank for producing such a tray - Google Patents

Description

The present invention relates to a tray made of cardboard sheet material having a rectangular bottom and a sidewall belt reinforced by pillars formed by folding a portion of the walls, to be manually mounted.

It also relates to a blank for the realization of such a tray.

It finds a particularly important application although not exclusive in the field of storage trays and transport of packaged products of any type (rigid or flexible) whose use is not limited to transport (requiring good rigidity and good compressive strength) but is also suitable for storing and presenting products in departments.

Such trays are flexible and thus allow a mix making them suitable for the delivery and / or the simultaneous promotion of several different products.

In the case where they are used with a lid, they are of easy opening. When opened on the side, they allow products to be visible by making them also directly accessible to consumers.

We already know ( FR 2,747,643 ) Corrugated cardboard trays with corner pillars obtained by folding end flaps.

Such trays, if they have good compressive strength, do not allow a presentation of the products on the sides.

We also know ( EP 2 036 827 ) modular trays provided with support elements connectable to the top tray by the kiss of side pillars obtained by folding.

Such packages require the presence of connecting rods and are therefore complicated to implement.

All these trays are designed to be folded, glued by being mounted automatically.

They therefore require investment in expensive machines and not always justified when the quantities sought are not very important.

The document EP 2 277 785 discloses a tray having all the features of the preamble of claim 1. The present invention aims to provide a tray and a blank made of cardboard sheet material better than those previously known to the requirements of the practice, in particular in that it allows to have the same advantages of presentation and solidity as with trays mounted in automatic with machines, while avoiding their costs and saving in cardboard surface compared to existing trays up to about 20% .

It is adapted to all product sizes, to a homogeneous presentation in linear, POS or pallet, and optimizes the sales area while facilitating access to products and allowing excellent identification of the product. Mark.

With the invention, the costs of multiple packaging are reduced, because of the modular nature of the trays that are storable for different products on the same pallet and their great flexibility because of their manual assembly, on demand and on request. absence of bonding.

A construction of the plate with a double bottom allowing a better resistance to buckling can also provided, the possibility of implementing vertical grooves doubled on the sides and the rear of the plate ensuring a better compressive strength and greater stability of the load.

Thus, an optimized Resistance / Surface / Weight ratio is achieved, with a carton, which can be fully recycled which reduces CO2 emissions.

Finally, such a tray makes it possible to limit the number of movements for placing in the linear, eliminating the need for a cutter and / or pre-cut when placing on the shelf.

• l'élément de renfort est formé par trois languettes verticales, reliées entre elles par des septièmes lignes de pliage, les deux premières languettes formant ledit pilier et la troisième languette, d'extrémité, étant bloquée par encliquetage d'un ergot de blocage solidaire du second rabat latéral dans un évidement le long de la septième ligne de pliage en vis à vis correspondant ;
• le côté du volet externe des premières parois comportant la sixième ligne de pliage est en biais par rapport à la verticale sur sa partie supérieure le long de ladite sixième ligne et comprend en partie inférieure un troisième rabat agencé pour coopérer avec la face interne du premier rabat correspondant, la quatrième ligne de pliage de la seconde paroi avant étant double ;

• chaque volet externe d'une première paroi comprend, du côté opposé aux troisièmes lignes de pliage et relié par une huitième ligne de pliage, un volet inférieur replié sur la face supérieure du fond du plateau pour former un demi double fond au plateau ;
• les deux volets inférieurs formant demi double-fonds comprennent des moyens de verrouillage de l'un avec l'autre ;
• les troisièmes lignes de pliage et la quatrième ligne de pliage de la seconde paroi arrière comprenant des tenons découpés dans lesdites troisième et quatrième lignes, en excroissance par rapport aux volets internes correspondants, et le fond du plateau comprend des évidements de forme complémentaire et disposés au droit desdits tenons, pour encastrement des tenons du plateau du dessous.

For this purpose, the invention proposes in particular a sheetboard material tray having a rectangular bottom and a sidewall belt, namely two opposite first side walls, called first walls, symmetrical with respect to a transverse axis of the plate and respectively each provided with at least one reinforcing element, forming a pillar and two second walls, namely a second rear wall and a second front wall of smaller height than the other walls, each of the walls being formed by a double panel obtained by wrapping an inner flap on an outer flap, the outer flap of the second rear wall being connected to the bottom by a first fold line, the inner flaps of said first walls being connected to said outer flaps, respectively, by a third double fold line and the inner flaps of the second walls to the corresponding external flaps by fourth fold lines doubling es, the respective internal flaps being of the same dimensions or substantially of the same dimensions as the respective outer flaps, their free peripheries opposite to said fourth double fold lines being locked by friction and / or by latching lugs with the upper face and / or corresponding recesses of the bottom of the tray and the inner flaps of the first walls each having a central rectangular panel of length l less than the width L of the bottom, said panel being connected at one of its lateral ends by a fifth fold line to the pillar reinforcing element provided with an end flap, said first flap cooperating with the inner face of the outer flap of the second front wall, said reinforcing element being folded and locked with respect to said central panel by means of a side flap, said second flap connected to the outer flap of the first wall by a sixth double fold line on the opposite side to the second folding lines, characterized in that the outer flap of the second rear wall is connected to the outer flaps of the first two walls by second fold lines perpendicular to the first fold line. In advantageous embodiments, in addition and / or otherwise one or more of the following provisions are used:

• the reinforcing element is formed by three vertical tongues, interconnected by seventh fold lines, the first two tongues forming said pillar and the third end tongue being locked by snapping of a locking pin integral with the second side flap in a recess along the seventh corresponding fold line;
• the side of the outer flap of the first walls having the sixth fold line is oblique with respect to the vertical on its upper part along said sixth line and comprises in part lower a third flap arranged to cooperate with the inner face of the corresponding first flap, the fourth fold line of the second front wall being double;

• each outer flap of a first wall comprises, on the opposite side to the third fold lines and connected by an eighth fold line, a lower flap folded on the upper face of the bottom of the plate to form a half-double bottom to the plate;
• the two lower flaps forming half double bottoms comprise locking means of one with the other;
• the third fold lines and the fourth fold line of the second rear wall comprising tenons cut in said third and fourth lines, protruding from the corresponding inner flaps, and the bottom of the tray comprises recesses of complementary shape and arranged at the right said tenons, for embedding the tenons of the tray below.

The invention also provides a blank for obtaining a tray as described above.

The invention thus proposes a blank, for the constitution of a tray, comprising a rectangular bottom and a sidewall waistband, namely two opposite first side walls, called first walls, symmetrical with respect to a transverse axis of the plate and two second walls, namely a second rear wall and a second front wall, of smaller height than the other walls, each wall being formed by an inner flap and an outer flap, the outer flap of the second rear wall being connected to the bottom by a first fold line, the inner flaps of said first walls being connected to said outer flaps, respectively, by a third double fold line and the inner flaps of the second walls to the corresponding outer flaps by fourth double fold lines, the respective inner flaps being of the same dimensions or substantially of the same dimensions as the respective external flaps, and the internal flaps of the first walls each comprising a central rectangular panel of length less than the width L of the bottom, said panel being connected at one of its lateral ends by a fifth fold line to a reinforcing element forming a pillar when the plate is formed, provided with an end flap, said first flap arranged to cooperate with the inner face of the outer flap of the second front wall when the plate is formed, said reinforcing element being arranged to be folded and blocked from said central panel by the biai s of a side flap, said second flap, connected to the outer flap of the first wall by a sixth double fold line located on the opposite side to the second fold lines, characterized in that the outer flap of the second rear wall is connected the outer flaps of the first two walls by second fold lines perpendicular to the first fold line. In an advantageous embodiment, each outer flap of a first wall comprises, on the opposite side to the third fold lines and connected by an eighth folding line, a lower flap folded on the upper face of the bottom of the tray to form a half-double background on the board.

Advantageously, the two lower flaps form a double bottom comprising means for locking one with the other (for example by tenon / mortise).

• La figure 1 est une vue en perspective d'un plateau selon un mode de réalisation de l'invention.
• La figure 2 est une vue en plan du flan permettant d'obtenir un plateau du type représenté à la figure 1.
• Les figures 3 et 4 sont des vues en perspective d'empilage sur palettes de plusieurs plateaux selon le mode de réalisation de la figure 1.
• Les figures 5A à 5J montrent les étapes de montage en manuel du plateau de la figure 1 à partir d'un flan du type de la figure 2.

The invention will be better understood on reading the following description of an embodiment given hereinafter by way of non-limiting example. The description refers to the accompanying drawings in which:

• The figure 1 is a perspective view of a tray according to one embodiment of the invention.
• The figure 2 is a plan view of the blank for obtaining a tray of the type shown in FIG. figure 1 .
• The figures 3 and 4 are perspective views of stacking on pallets of several trays according to the embodiment of the figure 1 .
• The Figures 5A to 5J show the manual assembly steps of the plateau of the figure 1 from a blank of the type of the figure 2 .

The figure 1 shows a plate 1, made of corrugated cardboard, for example three millimeters thick, having a rectangular bottom 2 and a belt 3 of rectangular or substantially rectangular walls, namely two opposite first walls 5, 7 and two opposite second walls 4, 6.

The second walls 4, 6 respectively form a front wall 4 and a rear wall 6.

In the embodiment more particularly described here, the first lateral walls 5, 7 have a symmetry with respect to a transverse plane of the plate along an axis 8.

Each of the first walls 5, 7 further comprises a reinforcing element 9 forming a pillar.

The pillar is of substantially triangular base section included in the corresponding wall and having a vertical edge 9 'protruding inside the tray.

The pillar extends over the entire height of the tray, namely the height of the side walls 5, 7, or is slightly higher, exceeding by the top of some tenth of a millimeter (for example between 0.5 mm and 2.5 mm).

Each pillar 9 is set back from the front wall 4, that is to say at a distance thereof between 5% and 40% of the length of the side walls 5, 7 considered.

The front wall 4 is of smaller height than the other three walls, side 5, 7 and rear 6, of substantially the same height.

The height of the front wall 4 is for example between 1/10 ^e and 1/5 ^e of the total height of the plate (ie other walls) for example 3 cm for a height of 15 cm.

In this way, the contents of the tray 1 is made very accessible.

Each wall 4, 5, 6, 7 is formed by wrapping, namely the folding of a cardboard flap on another flap of the same dimensions or substantially of the same dimensions, the two being interconnected by a double fold line forming thus a wall with double panel (or shutter).

More specifically, and with reference to the figure 2 the tray is formed by folding the blank F. This comprises internal flaps 10, 11, 12, 13 that is to say having a surface facing the interior of the tray, on which are folded flaps external 14, 15, 16, 17 of identical shape or substantially identical to the corresponding inner flaps.

The outer flap 16 is connected on one side to the bottom flap 2 by a first fold line 18 (for example double), and on both sides to the flaps 14, 15 of the first two walls 5, 7, by second fold lines 19, 20.

The second fold lines 19, 20 are perpendicular to the first fold line 18.

The first walls 5, 7 also comprise the internal flaps 10, 11, connected on the one hand to the outer flaps 14, 15, respectively, by a third folding line 21, 22 double and on the other hand (pre-cut) at the internal shutter 12.

The third fold lines 21, 22 comprise tenons Tr cut out in said third line, protruding from the corresponding inner flaps, the bottom of the plate comprising recesses Er of complementary shape and arranged in line with said tenons, for embedding the tenons of the bottom shelf.

The outer flap 16 is connected from the opposite side to the bottom, to the inner flap 12 by a fourth double fold line 23, and forms the rear wall 6 by folding the inner flap 12 on it.

The inner flap 13 of the second wall 4 is connected to the corresponding outer flap 17 by a fourth double fold line 24.

The fourth fold line 23 of the second rear wall also comprises at least one cut tenon Tr protruding from the corresponding inner flap, again the bottom of the plate comprising one or more recesses Er of complementary shape, and arranged in line with said tenons. , for embedding the tenons of the tray below.

The internal flaps 10, 11, 12, 13 respectively have the same dimensions or substantially the same dimensions as the corresponding external flaps 14, 15, 16, 17.

The inner flaps 10, 11, 12, 13 each comprise a free peripheral edge 25, 26, 27, 28 opposite to said fourth double fold lines 21, 22, 23, 24, provided with lugs 30, 31 ; 32, 33; 34, 35; 36, 37, 38 protruding from them.

These lugs are locked by friction and / or by snapping with the upper face 29 of the bottom 2 and / or are embedded in small rectangular recesses 39, 40; 41, 42 corresponding bottom 2 plateau.

The inner flaps 10, 11 of the first walls 5, 7 each comprise a rectangular central panel 43, 44 of length l less than the width L of the bottom 2.

The length l is for example between 200 mm and 380 mm for a width L between 320 mm and 450 mm for example 380.

On the opposite side to the inner flap 12, the inner flaps 10 and 11 respectively comprise a series of tabs and / or flaps. That is to say that the panels 43, 44 are respectively connected to one of their lateral ends 45, 46 by a fifth fold line 47, 48 to the reinforcing element 9 forming a pillar provided with a flap. end, said first flap 49, 50.

The first flap 49, 50 is rectangular for example 80 mm by 30 mm to 160 mm by 110 mm.

The first flap 49, 50 cooperates with the inner face 51 of the outer flap 17 of the second front wall 4.

The reinforcing element 9 is itself folded and locked relative to said central panel 43, 44 by means of a trapezoidal lateral flap, said second flap 52, 53.

This is connected to the outer flap 14, 15 of the first wall 5, 7 by a sixth fold line 54, 55, double, located on the opposite side to the second fold lines 19, 20.

The pillar is subsequently formed which is formed of a series of three vertical tongues 56, 57, 58; 59, 60, 61 between the inner flaps 10 and 11 and the first flaps 49, 50.

The first two vertical tabs 56, 57; 59, 60 are rectangular and the third 58; 61 consists of a triangle and / or trapezoid resting on a rectangle

The three vertical tongues, of a height equal to or slightly greater than that of the inner flap 12, are interconnected by seventh fold lines 62.

The first two tabs 56, 57; 59, 60 form the pillar 9 and the third tongue 58, 61 end, is locked by snapping a lug 63, 64 blocking, secured to the second side flap 52, 53 corresponding, in a recess 65, 66 along the seventh fold line 62 facing.

The second flap forms a side 67 of the first walls 5, 7 comprising the sixth fold line 54, 55, obliquely to the vertical on its upper part along said sixth line, and comprising in the lower part a third flap 68 , rectangular, arranged to cooperate with the inner face of the first flap 49, 50 corresponding, the fourth fold line 24 of the second front wall 4 being of a thickness corresponding to two thicknesses of the sheet of the cardboard.

In the embodiment more particularly described here, the bottom is reinforced.

Each outer flap 14, 15 of a first wall 5, 7 comprises, on the opposite side to the third fold lines 21, 22, and connected by an eighth fold line 69, 70, a lower flap 71, 72 folded on the face top of the bottom 2 of the tray to form a half-double bottom to the tray.

The lower flaps 71, 72 are of substantially rectangular shape for example 320 mm by 320 mm to 460 mm by 460 mm.

They are for example substantially symmetrical, with the exception of means 73, 74 for locking one with the other, with respect to the plane along the axis 8 and thus each form a half double bottom of the plate.

The locking means 73, 74 comprise a substantially trapezoidal pin on the free edge of one of the lower flaps 71, 72 adapted to collaborate with a groove on the other in a connection of the dovetail type.

Once the trays 1 have been formed, they can be stacked as shown in the drawings. figures 3 and 4 .

Their structure having a good resistance to compression their dimensions can be adapted to occupy a quarter pallet P ( figure 3 ) or an entire pallet per shift ( figure 4 ) without additional means of maintaining a stack of tray.

During the superposition of the trays, the tenons Tr of the bottom plate protrude from the corresponding wall 5, 7 to form a connection of the mortise type by fitting into the complementary recesses Er forming opening of the top tray.

In another embodiment the blank also includes openings of complementary shape to the flaps of the reinforcing pillar on the eighth line of folding adapted to collaborate with the height overhang of said pillar.

Manually mounting a tray from the blank according to one embodiment of the invention will now be more particularly described with reference to Figures 5A to 5J .

On the Figure 5A is presented the first step of mounting the plate that is the provision of an unfolded flat blank F.

In a second step ( Figure 5B ) the operator folds the inner flaps 10, 11, 12 around their fold line 22, 23 to form the inner flap rim on the outer flaps.

The folding is carried out at 180 ° so that the faces of the flaps are in contact.

The operator then protrudes (arrows 81) the edge of the pillar 9 reinforcement (step three, Figure 5C ), to form a dihedron. For this, the operator exerts a force in the plane of the blank and pushes in the inner direction of the blank as represented by the arrows 81.

This operation is carried out for example by placing a hand on either side of the vertical tabs 56, 57; 59, 60 on the flaps 10, 58; 11, 61.

The operator presses on the vertical tabs 56, 57; 59, 60 and maintains the reinforcement 9 in the form of a pyramid with a base on the corresponding blanks smaller than that sought.

In other words, it keeps the pyramids with a smaller apex angle than the final angle or stability.

The free edge 82 oblique in the plane of the blank of the vertical tongues 58, 60 then corresponds substantially to the sixth fold lines 54, 55.

The third flaps 68 then protrude first flaps 49, 50, and the second flaps 52, 53 (which protrude without vis-à-vis).

With reference to the figure 5D , the second substantially triangular flaps 52, 53 are then folded to 180 ° along the sixth fold lines 67 oblique on the vertical tabs 58, 61 previously folded (arrows 82).

The operator then releases the pressure on the reinforcement 9 and by spring effect of the cardboard and / or by pulling the operator in the opposite direction to that to form the reinforcement (arrows 83) it departs the base of the reinforcement 9 (step five , figure 5E ).

The operator ensures and / or guides the lugs 63, 64 to lock them by snap-fastening and integral mounting of the second lateral flap 52, 53 in the recess 65, 66 respectively along the seventh row 54, 55 of folding when they are opposite.

The operator then folds (arrows 84) the lower flaps 71, 72 at an angle of 90 ° with respect to the remainder of the blank along the eighth fold lines 69 (step six, figure 5F ).

Then, by folding (arrows 85) around the second fold lines 19, 20 at an angle of the order of 90 °, the operator brings the lower flaps 71, 72 closer together and brings the locking means (73, 74) in the locking position to form a double bottom to the plate (step seven, figure 5G ).

The post 73 is then inserted into the groove 74 to form the dovetail connection.

The operator then switches (arrows 86) the assembly by folding 90 ° on the bottom 2 along the first fold line to form the reinforced bottom 87 of the plate 1 (step eight, figure 5H ).

The set of first and third flaps 49, 68; 50, 68 are then bent 90 ° towards the inside of the tray (arrows 88) along the ninth folding line 89 (step nine, figure 5I ).

The operator completes the mounting of the tray by wrapping the front face 4, that is to say by folding 180 ° (arrows 90) the inner face 13 on the outer face 17 following the fourth double fold line 24 and by folding the assembly at 90 ° to form the front face (step ten, figure 5J ).

The assembly is secured by friction and / or clipping of the flanges 30, 31, 32, 33, 34, 35 etc. with the bottom and / or corresponding recesses.

As is obvious and as also follows from the above, the present invention is not limited to the embodiments more particularly described.

On the contrary, it embraces all the variants and in particular those where the fold lines are double, and / or where they comprise between two fold line a tab of boxes.

Claims (10)

1. Tray (1) made from cardboard sheet material comprising a rectangular base (2) and a ring (3) of side walls (4, 5, 6, 7), namely two opposed first side walls (5, 7), referred to as first walls, symmetric with respect to a transverse axis (8) of the tray and respectively each provided with at least one reinforcing element (9) forming a pillar and two second walls (4, 6), namely a second rear wall (6) and a second front wall (4) of lesser height than the other walls, with each one of the walls being formed by a double panel obtained by folding an internal section (10, 11, 12, 13) over an external section (14, 15, 16, 17), with the external section (16) of the second rear wall (6) being attached to the base by a first fold line (18), with the internal sections (10, 11) of said first walls (5, 7) being attached to said external sections (14, 15), respectively, by a third double fold line (21, 22) and the internal sections (12, 13) of the second walls (4, 6) to the corresponding external sections (16, 17) by fourth double fold lines (23, 24), with the respective internal sections (10, 11, 12, 13) having the same dimensions, or essentially the same dimensions as the respective external sections (14, 15, 16, 17), with the free peripheries (25, 26, 27, 28) thereof opposite said fourth double fold lines (21, 22, 23, 24) being locked by friction and/or by snapping of lugs (30, 31; 32, 33; 34, 35; 36, 37, 38) with the upper face (29) and/or corresponding recesses (39, 40; 41, 42) of the base (2) of the tray, and internal sections (10, 11) of the first walls (5, 7) each comprising a central rectangular panel (43, 44) of length 1 less than width L of the base (2), said panel (43, 44) being attached at one of its side ends (45, 46) by a fifth fold line (47, 48) to the reinforcing element (9) forming a pillar provided with an end flap, referred to as first flap (49, 50) engaging with the internal face (51) of the external section (17) of the second front wall (4), said reinforcing element (9) being folded and locked with respect to said central panel (43, 44) by means of a lateral flap, referred to as second flap (52, 53), attached to the external section (14, 15) of the first wall (5, 7) by a sixth double fold line (54, 55) located on the opposite face to the second fold lines (19, 20), characterised in that the external section (16) of the second rear wall (6) is attached to the external sections (14, 15) of the first two walls (5,7) by second fold lines (19,20) perpendicular to the first fold line (18).
2. Tray (1) according to claim 1, characterised in that the reinforcing element (9) is formed by three vertical tabs (56, 57, 58; 59, 60, 61), attached together by seventh fold lines (62), with the first two tabs (56, 57; 59, 60) forming said pillar (9) and with the third end tab (58, 61) being locked by snapping of a locking lug integral with the corresponding second lateral flap (52, 53) in a recess (65, 66) along the seventh fold line (62) opposite.
3. Tray as claimed in any preceding claim, characterised in that the face (67) of the external section of the first walls (5, 7) comprising the sixth fold line (54, 55) is at an angle in relation to the vertical on the upper portion thereof along said sixth line and comprises in the lower portion a third flap (68) arranged to engage with the internal face of the first corresponding flap (49, 50), with the fourth fold line (24) of the second front wall (4) being double.
4. Tray (1) as claimed in any preceding claim, characterised in that each external section (14, 15) of a first wall (5, 7) comprises, on the face opposite the third fold lines (21, 22), and attached by an eighth fold line (69, 70), a lower section (71, 72) folded onto the upper face of the base (2) of the tray in order to form a semi double base at the tray.
5. Tray according to claim 4, characterised in that the two lower sections forming a semi double-base include means (73, 74) for locking one with the other.
6. Tray as claimed in any preceding claim, characterised in that the third fold lines and the fourth fold line of the second rear wall includes tenons cut in said third and fourth lines, protruding in relation to the corresponding internal sections and the base of the tray comprises recesses of complementary shape and arranged in line with said tenons, for embedding of the tenons of the bottom tray.
7. Blank (F), for the constitution of a tray (1), comprising a rectangular base (2) and a ring (3) of side walls, namely two opposed first side walls (57), referred to as first walls, symmetric with respect to a transverse axis (8) of the tray and two second walls (4, 6), namely a second rear wall (6) and a second front wall (4) of lesser height than the other walls, with each of the walls being formed by an internal section (10, 11, 12, 13) and an external section (14, 15, 16, 17), with the external section (16) of the second rear wall (6) being attached to the base by a first fold line (18), with the internal sections (10, 11) of said first walls (5, 7) being attached to said external sections (14, 15), respectively, by a third double fold line (21, 22) and the internal sections (12, 13) of the second walls (4, 6) to the corresponding external sections (12, 13) by fourth double fold lines (23, 24), with the respective internal sections (10, 11, 12, 13) being of the same dimensions or substantially of the same dimensions as the respective external sections (14, 15, 16, 17), and the internal sections (10, 11) of the first walls (5, 7) each comprising a central rectangular panel (43, 44) of length less than the width L of the base (2), said panel (43, 44) being attached at one of its side ends (45, 46) by a fifth fold line (47, 48) to a reinforcing element (9) forming a pillar when the tray is formed, provided with an end flap, referred to as the first flap (49, 50) arranged to engage with the internal face (51) of the external section (17) of the second front wall (4) when the tray is formed, said reinforcing element (9) being arranged to be folded and locked in relation to said central panel (43, 44) by means of a lateral flap, referred to as second flap (52, 53), attached to the external section (14, 15) of the first wall (5, 7) by a sixth double fold line (54, 55) located on the opposite face to the second fold lines (19, 20), characterised in that the external section (16) of the second rear wall (6) is attached to the external sections (14, 15) of the first two walls (5, 7) by second fold lines (19, 20) perpendicular to the first fold line (18).
8. Blank according to claim 7, characterised in that the reinforcing element (9) is formed by three vertical tabs (56, 57, 58), attached together by seventh fold lines (62), with the first two tabs (56, 57; 59, 60) forming said pillar and the third end tab being arranged to be locked by snapping of a blocking lug (63, 64) integral with the second lateral flap (52, 53) in a recess along the seventh fold line when it is opposite.
9. Blank according to any of claims 7 and 8, characterised in that each external section (14, 15) of a first wall (5, 7) comprises on the face opposite the third fold lines attached by an eighth fold line (69, 70) a lower section (71, 72) arranged to be folded onto the upper face of the base (2) of the tray in order to form a semi double base at the tray.
10. Blank according to any of claims 7 to 9, characterised in that the face (67) of the external section of the first walls (5, 7) comprising the sixth fold line (54, 55) is at an angle on the upper portion thereof along said sixth fold line, and comprises in the lower portion a third flap (68) arranged to engage with the internal face of the first corresponding flap (49, 50), with the fourth fold line (24) of the second front wall (4) being double.

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