CZ289374B6 - Stackable container and shaped blank for its production - Google Patents

Abstract

In the present invention there is disclosed a stackable container (R1, R2) made of a single shaped blank (F1, F2), such as cardboard or corrugated cardboard. It has a form of upward open box with parallel walls comprising two pairs of mutually opposite and parallel square or rectangular main side walls (2, 4, 6, 8) following each other via parallel first folding lines (9 to 15, 17) and further comprising a bottom (26) arranged opposite to the box main aperture (25) formed by two pairs of parallel flaps (18.2, 18.4, 18.6, 18.8) following up with the main side walls (2, 4, 6, 8) by second folding lines (20.2, 20.4, 20.6, 20.8) being perpendicular to said first folding lines (9 to 15, 17). The invention is characterized in that the box has beveled side edges in the form of narrow walls (1, 3, 5, 7), each of which being introduced between two adjacent main side walls (2, 4, 6, 8) and follows up therewith by one first folding line (9 through 15, 17), whereby in the direction parallel to the first folding lines (9 to 15, 17) the height (H1) of one pair of the main side walls (2, 4, 6, 8) is greater than the height (H2) of the second pair of the main side walls (2, 4, 6, 8) in order to form a height difference of the upper free ends of the adjacent main side walls (2, 4, 6, 8) on the side of the box aperture (25), connected by the free upper edge (28, 30) of the thin wall (1, 3, 5, 7) located therebetween. Each narrow wall (1, 3, 5, 7) is provided at the bottom (26) level with a slot (27, 32) having dimensions corresponding to dimensions of its opposite free edge (28, 30) and open toward the box bottom (26) for insertion lower sections of both the higher side walls (2, 6) fitting close to the second folding lines (20.2, 20.6) of the stack upper container (R1, R2) into an aperture (25) of the stack bottom container (R1, R2) on the side of the upper free ends of its higher main side walls (2, 4, 6, 8), for supporting the second folding lines (20.4, 20.8) of both lower main side walls (2, 4, 6, 8) of the upper container (R1, R2) against free upper ends of both the lower main side walls (2, 4, 6, 8) of the bottom container (R1, R2) and for insertion of the upper free edges (28, 30) of the narrow walls (1, 3, 5, 7) in the aperture (25) of the bottom container (R1, R2) into slots (27, 32) of the narrow walls (1, 3, 5, 7) of the upper container (R1, R2).

Description

The invention relates to stackable containers which are open from above and are made of a single shaped cut-out, for example of plain or corrugated cardboard.

BACKGROUND OF THE INVENTION

The containers of this type are provided with guide ribs and slots which allow them to be stacked by sliding the slots of the upper container onto the ribs of the container located below it. To ensure sufficient stability of the stack, the guide ribs and cutouts are provided on the double side walls of the container. This method leads to an increased consumption of useful material.

SUMMARY OF THE INVENTION

The stackable container according to the invention has the form of a prismatic box open from above and is made of a single cut, for example of plain or corrugated cardboard.

A stackable container made of a single shaped die, for example plain or corrugated cardboard, has the shape of a top-open box with parallel walls comprising two pairs of mutually opposed and parallel square or rectangular main side walls adjoining each other over parallel first fold lines and further comprising the bottom against the upper opening of the box, formed by two pairs of parallel flaps adjoining the main side walls by second bending lines perpendicular to the first bending lines, and according to the invention is characterized in that the box has chamfered side edges in the form of narrow walls each interposed between two adjacent main side walls and adjoining each with one first bending line, wherein the height of one pair of main walls in a direction parallel to the first bending lines is greater than the height of the pair of main side walls to create a height difference of the upper the free ends of adjacent main side walls on the side of the box opening, connected by a free upper edge between the narrow walls therebetween, each narrow groove at the bottom level having a cutout of dimensions corresponding to its opposite free upper edge and open to the bottom of the box to receive the lower portions the upper side walls adjacent the second fold lines of the upper container stack to the opening of the lower container stack at the upper free ends of its higher main side walls, resting the second fold lines of the two lower main side walls of the upper container against the free upper ends of both lower main side walls of the lower and sliding the upper free edges of the narrow walls in the opening of the lower container into the slots of the narrow walls of the upper container.

In this way, according to the invention, a stable stack is created, taking advantage of the possibility of a partial transverse expansion of the opening of these containers, which is manifested in particular under the pressure of their contents on the inner walls, especially in products which can be uniformly stratified.

According to a preferred embodiment, in the direction parallel to the second bending lines, the length of the upper main side walls is greater than the length of the lower main side walls.

The container according to the above embodiment may further have a free upper edge of each narrow wall at the aperture defined by an edge of the free upper edge that adjoins the edge of the upper free end of the adjacent higher major side wall and a second edge of the free upper end parallel to the first bending lines connecting the edge a free edge with an edge of the upper free end of an adjacent smaller side wall to form a rectangular free upper edge, dimensionally corresponding to the wall cutouts.

-1 CZ 289374 B6

According to a further preferred embodiment, the tapered free upper edge of each narrow wall at the aperture is defined by an oblique edge of the free edge that adjoins the edge of the free upper end of adjacent major side walls to form a triangular free upper edge dimensional to the wall cutouts.

The container according to another preferred embodiment has a narrow wall cut lengthwise extending at least one of the first fold lines between the narrow wall and its adjacent major side walls. Preferably, the cutout extends beyond the first fold line between the narrow wall and the adjacent higher main side wall.

According to another embodiment of the invention, the stackable container, in the shape of a parallelepiped, with four main side walls, closed bottom and top opening without a lid, is made of a single shaped cutout, for example plain or corrugated cardboard, the side walls are greater than the height of the other two adjacent and mutually opposed major side walls to create different height levels of the free upper ends of the two adjacent major side walls, the container having bevelled side edges at the bottom provided with a cutout shape corresponding to the shape of the opposite free upper edge the side edges, wherein the main side walls and the tapered side edges are arranged to allow the upper free ends of the two opposite main side walls to be spaced apart due to the pressure of the contents of the container in the form of uniformly layered products.

Another aspect of the invention is a single blank cut, for example plain or corrugated cardboard, to form a stackable container according to any one of said embodiments, comprising a series of four rectangular or square fields of main side walls adjacent one another over parallel first fold lines and four flaps adjacent said fields on second bending lines, in a single line and perpendicular to the first bending lines, characterized in that the series of said bays comprises narrow wall arrays each interposed between adjacent arrays of the major side walls, the height of two non-adjacent arrays of the major side walls in a direction parallel to the first lines bends greater than the height of the two remaining non-adjacent fields of the main side walls so that on the side opposite the flaps the upper ends of the two adjacent side walls are free at different heights and joined free m, the opposing lower edges of the narrow wall arrays are spaced from the other bending lines to form cut-outs whose shape corresponds to the opposed free upper edges of the narrow wall arrays.

According to a preferred embodiment, in the direction parallel to the second bending lines, the length of the two major sidewall fields is greater than the length of the remaining two major sidewall fields.

According to yet another preferred embodiment of the die cutout, the free upper edge of each narrow wall array on the side opposite the flaps is defined as an extension of the upper free end of the adjacent higher main wall side array by a first edge and a second edge parallel to the first bending lines connecting the first edge to the free edge a top end of an adjacent lower field of the main side wall to form rectangular narrow wall fields.

According to another embodiment, the free upper edge of the narrow wall array on the side opposite the flaps is delimited by an oblique edge that joins the edges of the upper free ends of adjacent fields of the main side walls to form narrow wall arrays in the shape of a parallelepiped.

Furthermore, the blank may have cutouts on narrow wall fields extending lengthwise at least one of the first fold lines between the narrow wall field and the adjacent main side wall field. This allows easy insertion of the lower portions of the transverse walls of the lower container into the slots of the upper container.

The notch according to a further preferred embodiment extends beyond the first bending line between the narrow wall field and the adjacent higher field of the main side wall.

-2GB 289374 B6

The cut-off flaps, preferably adjacent to the higher field of the main side walls, widen in a funnel fashion from the second bending lines, the edge of the free edge of the bottom flaps at least partially describing the outline of the free lower edge of the higher field of the main side wall and the oblique edges of the free edges of two adjacent adjacent narrow fields. In this case, two successive die cuts can be carried out simultaneously to save material.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 shaped section of a first embodiment of a container according to the invention, Fig. 2 a container formed from the shaped die of FIG. 1, the container being placed schematically by an identical container, over 3, 4 side and longitudinal elevation of the container of FIG. 2, 5, 6 a top and bottom view of the container of Figures 2, 3 and 4, 7, 8, 9 Enlarged cut-outs on the transverse wall (Figures refer to Figures 3,4 and 6) Fig. 10,11 a side and longitudinal front view of the containers of FIGS. 2 to 6 placed one above the other, Fig. 12 a blank of a blank of a second embodiment of the container according to the invention and at the same time contact of two identical blank and a line Fig. 13 a container formed from the shaped section of FIG. 12, which is arranged schematically by an identical container, over 14, 15 a side and longitudinal front view of the container of FIG. 13, 16, 17 a top and bottom view of the container of FIGS. 13, 14 and 15,

Figs. 18, 19 and 20 are enlarged cross-sections of the transverse wall (Figs. refer to Figs. 14, 15 and 17); and Figs. 21, 22 are side and longitudinal elevational views of two containers of Figs.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a shaped blank F1 made of a blank or corrugated board which is arranged in a row of eight rectangular or square fields of the main side walls 2, 4, 6, 8 and the narrow side walls 1, 3, 5, 7. the two bands are adjacent to the preformed and parallel first fold lines 9-15. The free outer edge of the lower main side wall 8 is adjacent to the first fold line 17 parallel to the first fold lines 9-15, tab 16.

The main side walls 2, 4, 6, 8 are connected by flaps 18.2, 18.4, 18.6 and 18.8, each of which is connected to the respective main side walls 2, 4, 6, 8 by preformed second fold lines 20.2. 20.4. 20.6 and 20.8. which are guided in one row to be able to fold the flaps 18.4 and 18.8 onto the flaps 18.2 and 18.6, and are perpendicular to the first fold lines 9 to 15 and 17. The narrow side walls 1, 3, 5, 7 are not provided with flaps.

The higher main side walls 2, 6 are identical in dimension, their height H1. parallel to the first bending lines 9 to 15, 17 and the length L1, parallel to the second bending lines 20.2, 20.4, 20.6 and 20.8.

they are the same. Also, the two lower main side walls 4, 8 are identical and their height H2 and length L2 differ from said dimensions H1 and L1.

The length of the narrow side walls 1, 3, 5, 7 is parallel to the second bending lines 20.2, 20.4. 20.6, 20.8 smaller than the lengths L1 and L2.

The side walls 2, 4, 6, 8 are main walls, walls 1, 3, 5, 7 are narrow side walls interposed between the main walls 2,4, 6, 8.

The main side walls 2, 4, 6, 8 and the narrow side walls 1, 3,5,7 and tab 16 are delimited by edges 19.2, 19.4, 19.6, 19.8 and 19.1, 19.3 on the side opposite the flaps 18.2, 18.4, 18.6 18.8. . 19.5, 19.7. which are on the same level on the outside in a row. Also, the edges 19.4, 19.8 of the lower main side walls 4, 8 are at the same level. Since the height H2 is less than the height H1, the free edges 19.3. 19.5 the narrow side walls 3, 5 adjoin the edge 19.4 of the main side wall 4 with the second edges 21.3, 21.5. which almost coincide with the respective first lines 11, 12 and edges

19.7 the narrow side walls 7 and 19.16 of the tab 16 adjoin the edge 19.8 of the upper free edge of the main side wall 8 with the second edges 21.7, 21.16. which almost coincide with the respective first bending lines 9 to 15.17. As a result, the edges of the narrow walls 3, 5, 7 on the side opposite the flaps 18.2 to 18.8 of the bottom 26 form a projection 28.

At the bottom of the shaped die, i.e. between the flaps 18.2 to 18.8 of the bottom 26, the narrow side walls 1, 3, 5, 7 and the tab 16 are delimited by free edges 22.1, 22.3. 22.5, 22.7. 22.16, which are in line at the same level and form a recess 29, with a height d, for example of the order of 5 to 10 mm, from the second bending lines 20.2, 20.4, 20.6, 20.8. Each recess 29 extends over the first fold lines 9, 10, 13, 14 so that it slightly extends into the main side walls 4, 8. The height of the flaps 18.4, 18.8 is H4.

Edges 23.2, 24.2, 23.6. 24.6 the free edges of the flaps 18.2, 18.6 of the bottom 26 are beveled and the flaps 18.2. 18.6 are expanded from the second bending lines 20.2.20.6 by funneling and their height is H3.

It is preferred that the dimensions comply with H1 + H3 = H2 + H4. In this case, the edges of the flaps 18.4, 18.8 are connected to the recesses in the following shape cut, which are defined by a contour that corresponds to the second edges and edges 21.3, 19.4.21.5, respectively. 21.7.21.6.

The assembly of the open container R1 according to the invention from the shape die F1, Figs. 2-6, is accomplished by folding the shape die F1 by bending on the first fold lines 9-15. 17 and placing the tab 16 on the narrow side wall 1 such that the wall edge 25 '. 1 was identical to the first bending line 17. In this position, the tab 16 is glued or joined to the wall L. This creates the peripheral structure of the container R1. Then the flaps 18.4 are bent on the second bend lines 20.4, 20.8,

18.8 inside said peripheral structure and then in the same manner the flaps 18.2, 18.6 on the second bending lines 20.2. 20.6. All said flaps 18.2 to 18.8 are joined together by gluing or clamping to the bottom 26 in this position.

Beveled edges 23.2. 24.2, 23.6, 24.6 make an angle of 45 degrees with the other bending lines 20.2, 20.6. They are terminated by a vertical edge 23.2 '. 24.2 ', 23.6'. 24.6 '. which, with respect to the bending lines 20.4, 20.8 of the main side walls 4, 8, is situated inside the package, FIG. 6.

This arrangement facilitates load transfer by an open RL container

The open container R1 according to FIGS. 2 to 6, which has the shape of a parallelepiped box and an octagonal cross-section, is provided as described above.

The container R1 forms four side square or rectangular walls such that two and two are opposite and parallel. The side walls form the main side walls 2, 6 and 6 respectively. 4, 8. Opposite the opening 25, the container R1 is closed by a bottom 26 which is composed of four flaps 18.2. 18.4, 18.6. 18.8.

-4GB 289374 B6

The narrow side walls 1, 3, 5, 7 form the transverse walls of the container R1 and on the first two bending lines 9 to 10.

15, 17 adjoin the main side walls 2,4, 6, 8.

Due to the concession of 29 free edges 22.1. 22.3. 22.5. 22.7 of the lower narrow side walls 1, 3, 5, 5 7 each transverse wall at the bottom 26 of the container R1 is provided with a rectangular slot 27 which is opened into said bottom 26 as shown in FIGS. 7, 8, 9 on an enlarged scale .

The two identical containers R1 are stacked so that the side walls 1 to 8 of the upper stack R1 of the stack are directed vertically to the same walls 1 to 8 of the lower container R1, Fig. 2. The two containers 10 are inserted in each other. 10, 11, so that the second bending line 20.2,

20.6 of the two main side walls 2, 6 of the upper container R1 are inserted into the opening 25 of the lower container R1 under the free edges 19.2, 19.6 of the upper free edge of the main side wall 4, 8 of the lower container R1. Second bending lines 20.4. 20.8 of the two main side walls 4, 8 of the upper container R1 are supported on the edges 19.4, 19.8 of the two main side walls 4, 8 of the lower container 15 R1, allowing the edges 23.6 '. 24.6 '. 24.2 '. 23.2 'recessing from said edges 19.4, 19.8 and the projections 28 of the lower container R1 are inserted into the slots 27 of the upper container R1.

In this way, a stable stack of containers can be created. The insertion of the lower portion, the portion of the fields at the second fold lines 20.2, 20.6, of the upper container R1 into the opening 25 of the lower container R1 causes the opening 25 to open 20 by moving away the edges 19.2, 19.6 of the upper free edge of the main side walls 2, 6. This is due to the mere stacking of the containers R1, but is mainly generated spontaneously due to the pressure of the contents of the lower container R1 on its main side walls 2, 6.

The effect of spacing the walls is shown by the broken line in Figs. 10, 11. It is somewhat exaggerated to illustrate this particular characteristic of the invention, which is particularly typical in the above-described embodiment of the invention.

Fig. 12 shows an embodiment of a shaped blank F2 according to the invention which differs from the above shaped blank F1 in the following.

³⁰

The narrow side walls 1, 3, 5, 7 and tab 16 are parallelograms.

Free edges 19.Γ. 19.3 '. 19.5 '. 19.7 ' and 19.16 ' of narrow side walls 1, 3, 5, 7 and tabs 16 are oblique and parallel to opposite edges of said walls 1, 3, 5, 7, one of the extreme points of the free 35 oblique edges 22. hran. 22.3 '. 22.5 '. 22.7 'and 22.16' of the lower edges of said narrow walls 1, 3, 5, 7 and tabs 16 lie at the level of the second fold lines 20.4, 20.8 and the opposite end point of said free edges is offset by a distance d from the second fold lines 20.2,20.6. With this arrangement, a triangular blank 31 is formed obliquely with respect to the second bending lines 20.2 to 20.8, extending obliquely, for example, to the first bending lines 9, 11, 13, 14.

The free edges 32.2, 32.6 of the bottom flaps 18.2, 18.6 are not rectilinear as in the embodiment of Fig. 1, but cut out and describe the line of the row of edges 19.1 '. 19.2 '. 19.3 'of the upper free edges of the respective side walls and, on the other hand, the line of the row of edges 19.5'. 19.6 '. 19.7 'of the upper free edge of the respective side wall. Such an arrangement, shown in FIG. 12, allows the close fit of two shaped 45 die cuts F2, which results in material savings during manufacture.

The embodiment of the container R2 from the shaped section F2 is shown in FIGS. 13 to 17. The embodiment is similar to that of the container R1.

With respect to the bosses 31, each transverse narrow side wall 1, 3, 5, 7 of the container R2 is provided with a triangular cut-out 32 at the bottom 26 which is open to said bottom 26. An embodiment of the cut-out 32 is shown on an enlarged scale in FIGS. 18, 19, 20.

13, 21, 22, the stacking of two containers R2 is shown in solid lines. It is made that the second bending line 20.2. 20.6 of the two main side walls 2, 6 of the upper container R2 are

Inserted into the opening 25 of the lower container R2. Bend lines 20.2, 20.6 are inserted below the free edges 19.2. 19.6 of the upper free edge of the main side wall 2, 6 of the lower container R2.

The second fold lines 20.4, 20.8 of the two main side walls 4, 8 of the upper container R2 are supported by the free edges 19.4. 19.8 of the upper free edge of the two side walls 4, 8 of the lower container R2, which is made possible by the edges 23.6 '. 24.6 '. 24.2 '. 23.2 '. which due to the second bending lines 20.4.

20.8 retreat.

The bevelled edges 30 of the lower container R2 are inserted into the triangular slots 32 of the upper container R2.

Also in this example, the widening of the opening is mainly due to deformations of the package due to the contents of the container. It is shown in dotted lines in Figs. 21, 22 in somewhat exaggerated form to exemplify one of the principles of the invention.

PATENT CLAIMS

Claims (14)

A stackable container made of a single shaped die (F1, F2), for example of plain or corrugated cardboard, having a shape of a top-open box with parallel walls comprising two pairs of mutually opposed and parallel square or rectangular main side walls (2, 4, 6) , 8) adjoining each other over parallel first fold lines (9 to 15, 17) and further comprising a bottom (26) opposite the top opening (25) of the box formed by two pairs of parallel flaps (18.2, 18.4, 18.6, 18.8) on the main side walls (2, 4, 6, 8) by second fold lines (20.2, 20.4, 20.6, 20.8) perpendicular to the first fold lines (9 to 15, 17), characterized in that the box has chamfered side edges in the form narrow walls (1, 3, 5, 7), each of which is interposed between two adjacent main side walls (2, 4, 6, 8) and is connected thereto by one first bending line (9 to 15, 17), wherein height (H1) of one pair of main bo the side walls (2, 4, 6, 8) in a direction parallel to the first bending lines (9 to 15, 17) is greater than the height (H2) of the second pair of main side walls (2, 4, 6, 8) to create a height difference the upper free ends of adjacent main side walls (2, 4, 6, 8) on the side of the box opening (25) joined by the free upper edge (28, 30) between the narrow side walls (1, 3, 5, 7) each narrow wall (1,3, 5, 7) at the bottom (26) being provided with a cut-out (27, 32) having dimensions corresponding to the dimensions of its opposite free upper edge (28, 30) and open to the bottom (26) of the insertion box the lower portions of the higher side walls (2, 6) adjacent the second fold lines (20.2, 20.6) of the upper container stack (R1, R2) into the opening (25) of the lower container container (R1, R2) on the upper free ends walls (2, 4, 6, 8) to support the second bending lines (20.4, 20.8) of both lower the upper main side walls (2, 4, 6, 8) of the upper container (R1, R2) by the free upper ends of both lower main side walls (4, 8) of the lower container (R1, R2) and for inserting the upper free edges (28, 30) the narrow walls (1, 3, 5, 7) in the opening (25) of the lower container (R1, R2) into the slots (27, 32) of the narrow walls (1, 3, 5, 7) of the upper container (R1, R2) . Container according to claim 1, characterized in that, in the direction parallel to the second bending lines (20.2, 20.4, 20.6, 20.8), the length (L1) of the upper main side walls (2, 6) is greater than the length (L2) of the lower main side walls (4, 8). Container according to claim 1 or 2, characterized in that the free upper edge (28) of each narrow wall (1, 3, 5, 7) at the opening (25) is defined by the edge (19.1, 19.3, 19.5, 19.7) of the free an upper edge (28) adjoining an edge (19.2, 19.6) of the upper free end of the adjacent higher main side wall (2, 6) and a second edge (21.3, 21.5, 21.7, 21.16) of the free upper edge (28) parallel to the first bending lines (9-15, 17) that connect the edge (19.1, 19.3, 19.5, 19.7) to the edge (19.4, 19.8) of the upper free end of the adjacent lower main side wall (4, 8) to form A rectangular free upper edge (28) corresponding to the cutouts (27) of the walls (1, 3, 5, 7). Container according to claim 1 or 2, characterized in that the bevelled free upper edge (30) of each narrow wall (1, 3, 5, 7) at the opening (25) is delimited by an oblique edge (19.Γ, 19.3 '). 19.5 ', 19.7') of the free edge (30) adjoining the edge (19.2, 19.4, 19.6, 19.8) of the free upper end of adjacent main side walls (2, 4, 6, 8) to form a triangular free upper edge (30) dimensionally corresponding to the cut-outs (32) of the walls (1, 3, 5, 7). Container according to any one of claims 1 to 4, characterized in that the cut-out (27, 32) the narrow walls (1, 3, 5, 7) extending longitudinally at least one of the first fold lines (9 to 15, 17) between the narrow wall (1, 3, 5, 7) and adjacent major side walls (2,4) , 6, 8). Container according to claim 5, characterized in that the cut-out (27, 32) extends beyond the first fold line (9 to 15, 17) between the narrow wall (1, 3, 5, 7) and the adjacent higher main side wall (2, 3). 6). A parallelepiped stackable container with four main side walls (2, 4, 6, 8), a closed bottom (26) and a top opening (25) without a lid, made of a single shaped die (F1, F2), for example made of plain or corrugated cardboard, characterized in that the height (Η 1) of the two opposite main side walls (2, 4, 6, 8) is greater than the height (H2) of the other two adjacent side walls (2) , 4, 6, 8) to form different height levels of the free upper ends of two adjacent main side walls (2, 4, 6, 8), wherein the container (R1, R2) has tapered side edges in the form of narrow side walls (1, 3). 5, 7) at the bottom provided with a cut-out (27, 32) whose shape corresponds to the shape of the opposite free upper edge (28, 30) of the side wall (1, 3, 5, 7), the main side walls (2, 4, 6, 8) and bevelled side edges in the form of narrow side walls (1, 3, 5, 7), wherein the main side walls (2, 4, 6, 8) and the tapered side edges in the form of narrow side walls (1, 3, 5, 7) are arranged to allow the upper free ends of the two opposite main side walls (2, 6) to move away under pressure Container contents (R1, R2) in the form of uniformly layerable products. Molded cut from a single blank, for example plain or corrugated cardboard, to form a stackable container according to any one of claims 1 to 6, comprising a series of four rectangular or square fields of main side walls (2, 4, 6, 8) adjoining each other over parallel first bend lines (9 to 15) and four flaps (18.2, 18.4, 18.6, 18.8) following the fields on the second bend lines (20.2, 20.4, 20.6, 20.8), aligned in a single line and perpendicular to the first bend lines ( 9 to 15, 17), characterized in that the plurality of said fields comprise fields of narrow walls (1, 3, 5, 7), each of which is interposed between adjacent fields of the main side walls (2, 4, 6, 8), the height (H1) of the two non-adjacent fields of the main side walls (2, 4, 6, 8) in a direction parallel to the first bending lines (9 to 15, 17) is greater than the height (H2) of the two remaining non-adjacent fields of the main side walls (2, 4, 6, 8) so that on p but opposed to the flaps (18.2, 18.4, 18.6, 18.8), the free upper ends of the two adjacent fields of the main side walls (2, 4, 6, 8) were at different height levels and were joined by the free upper edge (28, 30) (1, 3, 5, 7), the opposing lower edges of the narrow wall arrays (1, 3, 5, 7) being spaced from the other bending lines (20.2, 20.4, 20.6, 20.8) to form slits (27, 32). ), the shape of which corresponds to opposite free upper edges (28, 30) of the narrow wall fields (1, 3, 5, 7). A blank according to claim 8, characterized in that, in the direction parallel to the other bending lines (20.2, 20.4, 20.6, 20.8), the length (L1) of the two main side walls (2, 6) is greater than the length (L2) of the other two fields the main side walls (4, 8). A blank according to claim 8 or 9, characterized in that the free edge (28) of each array of narrow walls (1, 3, 5, 7) on the side opposite the flaps (18.2, 18.4, 18.6, 18.8) is defined in an extension of the upper the free end of the adjacent higher field of the main side wall (2, 6) with a first edge (19.1, 19.3, 19.5, 19.7) and a second edge (21.3, 21.5, 21.7, 21.16) that is parallel 289374 B6 joins the first edge (19.1, 19.3, 19.5, 19.7) with the free upper end edge (19.4, 19.8) of the adjacent lower field of the main side wall (4, 8) for forming rectangular-shaped fields of narrow walls (1,3,5, 7). A blank according to claim 8 or 9, characterized in that the free upper edge (30) of the array of narrow walls (1, 3, 5, 7) on the side opposite the flaps (18.2, 18.4, 18.6). , 18.8) is defined by an inclined edge (19.Γ, 19.3 ', 19.5', 19.7 ') that connects the edges (19.2, 19.4, 19.6, 19.8) of the upper free ends of adjacent fields of the main side walls (2, 4, 6, 8). ) to form fields of narrow walls (1, 3, 5, 7) in the shape of a parallelepiped. A blank according to any one of claims 8 to 11, characterized in that the cut-outs (27, 32) extend over at least one of the first lines on the narrow wall arrays (1, 3, 5, 7). a bend (9 to 15, 17) between the narrow wall field (1, 3, 5, 7) and the adjacent main side wall field (2, 4, 6, 8). A blank according to claim 12, characterized in that the cutout (27, 32) extends beyond the first bending line (9 to 15, 17) between the narrow wall field (1, 3, 5, 7) and the adjacent higher field of the main side wall (1). 2, 6). A blank according to any one of claims 11 to 13, characterized in that the flaps (18.2, 18.6) adjoining the higher field of the main side walls (2, 6) extend in the funnel direction from the second bending lines (20.2, 20.6), the edge (23.2, 24.2, 23.6, 24.6) of the free edge of the bottom flaps (18.2, 18.6) at least partially describes the outline of the free lower edge of the higher field of the main side wall (2, 6) and the oblique edges (22.1 ', 22.3', 22.5) ', 22.7') of the free edges of two adjacent fields of narrow walls (1, 3, 5, 7).