FR2773778A1 - Box filling machine, esp for bottles in cardboard boxes with top and bottom flaps - Google Patents

Abstract

The filling machine comprises a feed conveyor (104) to deliver the articles to be packed to a central island (134) and incorporates a system (136) for closing the bottom and top flaps of the box, combined with an output member (168). The island is able to pivot on a vertical shaft and forms an extension on a level with the conveyor; it has a detector (156) in the form of a plate on the end of a lever which stops the island in the correct position for filling.

Description

SECTION BOX ADJUSTED TO CONTENT, NECESSARY BLANK AND
CASING DEVICE USING IN PARTICULAR THE SAME
The subject of the present invention is a box section adjusted to the content, intended for the packaging of objects or lots of objects of substantially cylindrical or partially cylindrical shape, as well as the necessary blank made of sheet material, such as for example cardboard or corrugated cardboard. The invention also relates to a boxing device, in particular for batches of bottles, preferably using said box.

 Corrugated cardboard boxes are widely used in packaging, they make it possible to condition objects or batches of objects, these being introduced through the upper opening of the box. A well-known type is the American checkout.

 In general, the boxes have a square or rectangular section which does not perfectly fit the section of the contents which rarely has the same shape.

 Also, the content is not firmly held in the box, so that it can move in the box, causing some instability during handling.

 In addition, the protruding and empty corners are exposed to external aggressions and can be easily torn, which is detrimental to the presentation and protection of the wrapped objects.

 On the other hand, to guarantee the integrity of the box, it is necessary to use a sheet of corrugated cardboard having good mechanical strengths.

 To partially remedy these drawbacks, patent application EP-A 0.712.784 proposes a box having cut corners, the main lateral faces being interconnected by intermediate lateral faces. This box in particular makes it possible to reduce the risks of deterioration of the projecting corners and to obtain a gain in material.

 However, the shape of this box does not adapt perfectly to the shape of the content and there are still empty corners even if these are less vulnerable.

 Also due to the presence of these angles, it is always necessary to have a cardboard sheet having good mechanical strengths in order to have a sufficiently rigid body.

 The present invention aims to overcome these drawbacks by proposing a blank for the production of a box whose section is perfectly adjusted to the content, by virtue of curved shapes, which makes it possible to use the mechanical strength of the content to ensure the integrity of the body, and which results in a significant gain in volume and weight of the material used.

 The present invention also provides a casing device, in particular for batches of bottles, using said case.

 In known manner, at the end of the bottling lines, the bottles are introduced, by the opening of the upper face of each box, manually by an operator. This repetitive and very exhausting task does not make it possible to obtain a sustained rate of cashing. In the case where automatic grippers with pneumatic or hydraulic grippers are used, the devices are very expensive, complex and these installations remain reserved for high speeds.

 The present invention also proposes a device for casing batches of bottles, semi-automatic or automatic, making it possible to introduce the bottles into the box without the need to lift them. This device makes it possible in particular to make the operation less painful, while increasing the rate of cashing, and above all this device finds an application in units of small and medium sizes.

 To this end, the invention relates to a box intended for the packaging of at least one object, in particular batches of objects of substantially cylindrical or partially cylindrical shape, characterized in that it comprises at least two lateral faces connected together by areas of less rigidity, and at least one bottom.

 Preferably, one of the lateral faces is produced in two parts connected to each other by connecting means.

According to a preferred embodiment, the box comprises
- four lateral faces of substantially rectangular shape, perpendicular to each other and linked in pairs by zones of less rigidity,
a bottom produced by lower flaps attached to the lateral faces by preformed fold lines, and
- a top produced by upper flaps attached to the lateral faces by preformed fold lines.

 The subject of the invention is also a blank for making, from a sheet, the box according to the invention, characterized in that it comprises a central part produced by the lateral faces, and the zones of less rigidity, arranged alternately, the bottom being connected to at least one of the lateral faces by a preformed fold line.

 According to a preferred embodiment, the blank comprises a central part produced by the four lateral faces, between which the zones of less rigidity are inserted, the two parts forming one of the lateral faces being arranged at each end of the central part, the upper flaps and the lower flaps, of length l / 2, being disposed on each side of said central part, and attached to the lateral faces respectively by the preformed fold lines, and the preformed fold lines, the attached lower and upper flaps with the lateral face being carried out astride the two parts.

 Preferably, the zones of less rigidity are obtained by crushing the sheet in said zones using a suitable crushing profile.

 According to another characteristic, the crushing varies in density and / or in depth progressively along the median axis of the blank so that it is weak at the junction of the lateral faces and the zones of less rigidity, and maximum in the middle of said zones.

 Advantageously, the crush profile is made up of a succession of sinusoidal curves.

 Finally, the invention also relates to a device for cashing batches of objects, in particular using a box according to the invention.

Other characteristics and advantages will emerge from the description which follows of the object according to a preferred embodiment, description given by way of example only, with reference to the appended drawings in which
- Figure 1 is a perspective view of a box according to the invention
with its upper flaps open,
- Figure 2 is a flat view of a first example of blank for the
realization of the box illustrated in FIG. 1,
- Figure 3 is a top view of the box made from the blank
in Figure 2,
- Figure 4 is a flat view of a second example of blank for the
realization of the box illustrated in FIG. 1,
- Figure 5A is a perspective view of a second box along
the invention,
- Figure 5B is a flat view of the blank for making the illustrated box
Figure 5A,
- Figure 6 is a top view of the casing device according to
the invention,
- Figure 7 is a side elevational view of the casing device,
- Figures 8A to 8G show a block diagram of the operation of the
device, and
- Figure 9 is a detail view of the pivot axis of the island.

In Figures 1, 2 and 3, there is shown a box 10 according to the invention, provided in particular to receive six bottles, as well as a flat blank 12 necessary for its production. It is made from a sheet material having a certain rigidity, for example cardboard or corrugated cardboard. This box has the length L and the width
According to a preferred embodiment, this box has a bottom face forming the bottom 14, an upper face 1 6, and four side faces referenced 18, 20, 22 and 24 of substantially rectangular shape, perpendicular to each other and linked in pairs by zones 26, 28, 30, 32 of less rigidity capable of adapting to the contents of the box.

 These areas of less rigidity do not reduce the resistance to vertical compression of the box 10 compared to the boxes of the prior art.

 One of the side faces, the face 24, is made in two parts 34, 36 connected by means 38 of connection in order to form from the blank 12, flat, the body 1 0. These means 38 of connection can be made by Conjugated forms formed on the edges facing these two parts 34 and 36, as illustrated in FIG. 1. A particular embodiment of these conjugated forms will be described in detail with reference to the blank of FIG. 2.

 In Figure 2, there is shown an example of blank for obtaining the body 10. 11 includes a central portion 40 formed by the side faces 18, 20, 22, 24, interconnected by the zones 26, 28, 30 , 32, the lateral face 24 being produced in two parts 34 and 36 arranged at each end of the central part 40.

 In order to make the sheet material less rigid in these zones 26, 28, 30, 32, the blank is crushed according to a suitable crush profile 41. The profile can be, among other things, a succession of sinusoidal curves, visible in FIG. 2.

 According to an improvement in the crushing profile, it varies in density and / or in depth progressively along the median axis 42 of the blank 1 2.

Thus, it is very low at the junction with the lateral faces and it is maximum in the middle of the zone considered.

 According to a particular embodiment, connecting means 38, the respective free edges 44 and 46 are cut symmetrically to form hooks 48 opposite which fit into one another. These connecting means 38 make it possible in particular to interconnect the parts 34 and 36 above and below and below above.

 The blank 1 2, illustrated by FIG. 2, also comprises on one side of the central part 40, upper flaps 501, 502, 503, 504, and on the other side of the lower flaps 521, 522, 523, 524 which respectively form the top 1 6 and the bottom 1 4 of the body and which have a length l / 2.

 The upper flaps 501, 502, 503, 504 are respectively connected to the lateral faces 18, 20, 22, 24 by preformed fold lines 541, 542, 543, 544. The upper flap 504 connected to the lateral face 24 is produced at horse on both sides.

 These upper flaps are distinct and separated from each other by cutting lines 56. A recess 58 formed between each flap in line with each zone 26, 28, 30, 32 of less rigidity makes it possible to obtain flap shapes which adapt perfectly to the body section.

 The lower flaps 521, 522, 523, 524 are respectively connected to the lateral faces 18, 20, 22, 24 by preformed fold lines 601, 602, 603, 604. The lower flap 524 connected to the lateral face 24 is produced at horse on both sides.

 A recess 62 formed between each flap in line with each zone 26, 28, 30, 32 of less rigidity makes it possible to obtain flap shapes which adapt perfectly to the section of the body.

 According to a particular embodiment, the lower flaps 521, 522, 523, 524 are interconnected by fold lines 64 perpendicular to the fold lines 60. In addition, the lower flaps 522 and 524, arranged facing each other. screws, are provided with fold lines 66 to 450 to form bellows 68, visible in Figure 3, thanks to which the closing of the lower flaps is possible.

 To form the body 10 from the blank 12, it suffices to join the two parts of the lateral face 24 using the connecting means 38 and to form the bottom 14 by first folding the flaps 522 and 524 then the flaps 521 and 523 .

 Thus, thanks to zones 26, 28, 30, 32 of less rigidity, the section of the body is perfectly adapted to that of the content and an excellent setting is obtained. By varying the crushing, the risks of angle formation at the level of the body section are eliminated, the zones of less rigidity being thus tangent as close as possible to the lateral faces at the junctions. Therefore, all the empty and unnecessary dihedrons or salient corners are eliminated which allows on the one hand to obtain a significant gain in weight and volume of the material used, and on the other hand to use the resistance mechanical content to guarantee the integrity of the box.

 So to give an order of magnitude, the gain in surface area is 6% compared to an American box for packaging with the same content.

 Thanks to shapes adapted to the content section, it is also possible to use less resistant sheet materials. Indeed, in this case, the content largely gives the body its mechanical strength, and not only the material used as was the case for the boxes of the prior art.

 Furthermore, this form of box makes it possible, during the palletizing of said boxes, to obtain better resistance of the film surrounding the pallet, and to create ventilation chimneys.

 Another example of blank 70 for making the box 10 is shown in FIG. 4, with connecting means 38, flaps, and a crushing profile 41 different from those of the blank 12, 1 assembly having great symmetry.

 In this case, the connecting means 38 are produced by means of two tongues 74, formed in the part 36, which are housed in windows 76 formed in the part 34.

 The lower and upper flaps 72 are identical and have the same shapes as the upper flaps 50 of the blank 1 2.

 As for the crushing profile 41, it is produced by a first group of lines parallel to the upper edge of the body and a second group of oblique lines.

 Another type of box 80 according to the invention, which can be used for cashing contents with reduced volume such as two bottles, is shown with its blank 82 in FIGS. 5A and 5B. It only comprises two lateral faces 84 and 86 connected by zones 88, 90 of less rigidity.

 In this case, the crushing profile 41 retained is identical to that of the blank 70 visible in FIG. 4 and the lateral face 84 comprises fixing means 92 identical to those of the blank 1 2 illustrated by FIG. 2.

 As before, the lateral faces are provided on each side with flaps 94 which have a shape adapted to the section of the body.

 Also, the box of the invention is not limited to boxes having two or four side faces. It includes all the boxes having at least one lateral face, the two lateral edges of this face being connected by a zone of less rigidity. Optionally, the connecting means 38 can be replaced or reinforced by means known to those skilled in the art such as in particular bonding or stapling.

 As we have seen, the box 10 of the invention is particularly well suited for the packaging of objects or batches of objects of substantially cylindrical shape.

 A boxing device 100 using in particular the box 10 according to the invention is shown in Figures 6 and 7. It allows by way of example to put in a box of six bottles.

 This casing device 100 is preferably placed at the end of the bottling line 102, and comprises a first belt conveyor 104, a central part 106, and possibly a second evacuation belt conveyor 108, not shown, perpendicular to the first, the assembly being arranged on a platform 110 adjustable in height by means 112 of adjustment, which allows adaptation to all bottling lines.

 The feed conveyor 104, by means 114 of deflection, collect the bottles leaving the bottling line, in order to bring them to the central part 106. In the case where the feed conveyor 104 is not not perfectly perpendicular to the conveyor of the bottling line, as shown in FIG. 6, a dead plate 115 placed at height makes it possible to ensure continuity from one conveyor to the other.

 This feed conveyor 104 comprises distribution means 116 which make it possible to distribute the bottles equally on either side of a central partition 118. These distribution means 1 1 6 are produced by an alternative device called a "sculler" 1 20 in the form of a diabolo, arranged on the median axis of the conveyor 104, pivoting about a vertical axis 122, and which alternately orients the bottles on one of the two lines 1 24 and 125. Thus, when the bottle 126 passes, the scraper 120 pivots in a first direction, which frees the passage of the bottle 1 27 and which blocks the bottle 1 28. During the passage of the bottle 127, the scraper pivots in the other direction, which blocks the passage of the bottle 12 and which authorizes the passage of the bottle 128.

 The central part 106 comprises a frame 130 surrounded by a housing 132 of ovoid shape, means 1 34 for isolation produced by a central island of circular shape, and means 1 36 for closing the upper and lower flaps of the body 10 .

 The frame 1 30, made from a mechanically welded structure, is fixed to the platform 1 1 0. According to another alternative embodiment not shown, the frame 1 30 can be made from a monocoque structure resin.

 The casing 132, partially shown in FIG. 7, is symmetrical along a median axis 138, in order to make it reversible, it comprises in the center a circular opening 140 capable of receiving the island 134, on each side a clearance 142 for fixing the conveyor 104 feed, and a slot 144 capable of passing a lever.

 The island 134, arranged as an extension and at the same height as the feed conveyor 104, is fixed to the upper end of a vertical axis 146, rotatably mounted relative to the frame 1 30.

 It comprises on each side, in the extension of the lateral edges of the supply conveyor 104, slots 148 capable of allowing the corresponding upper flaps of the body 10 to pass, and rims 1 49 provided for guiding the bottles. The island 134 is capable of isolating a batch of six bottles, by automatically pivoting by a quarter of a turn thanks to a mechanical actuator 150 of the spring or jack type, which tends to rotate the island 134 in one direction, clockwise 151 as illustrated in Figure 8A.

 As shown in Figure 7, the island 1 34 comprises in the lower part, a fixed part 1 52 and a movable part 1 54 capable of taking two positions, one retracted in the fixed part 1 52 in order to allow folding from one of the lower flaps, and the other outlet by means of elastic return means.

 The island 1 34 is also provided with detection means 1 56, illustrated in FIG. 8A, which authorize the pivoting of a quarter turn of the island 1 34, when six bottles are grouped together.

 These detection means 1 56 include a plate 158, arranged perpendicular to the direction of movement of the bottles, fixed on a lever arm 1 60 which can pivot around an axis 1 62 substantially vertical.

This plate 158, which blocks the bottles, comprises an indexing finger 164 which immobilizes in rotation the island 134 by resting on one of the flanges 1 49. In addition, a spring 1 66 allows, if the pressure combined of the two rows of bottles on the island 1 34 is insufficient, to immobilize in rotation the lever arm 1 60 and to prohibit any movement of the plate 158. Thus, when six bottles are grouped on the island 134, the other bottles are on the feed conveyor 104 continue to push the batch of six bottles. The two bottles placed against the plate 1 56 then exert sufficient pressure to overcome the return force of the spring 166, and rotate the lever arm 1 60. Consequently, the indexing finger 164 no longer retains the island which pivots under the effect of
mechanical actuator 1 50.

 In order to evacuate the box 10 from the island 134, the frame 130 comprises evacuation means 168 which comprise a lever 170, provided with a pusher 172 and an operating handle 174.

 The lever 170, which passes through the slot 1 44 formed in the casing 132, is pivotally mounted in a substantially vertical plane around a horizontal axis 175, arranged in the lower part of the frame 1 30. This lever allows the body to be evacuated 10 filled in the direction of the second conveyor 108 thanks to the pusher 1 72.

 The central part 106 also comprises the means 1 36 for closing the lower and upper flaps of the body 10 constituted by a first set 1 76 of fixed stops, a second set 1 78 of fixed stops, and a movable stop 1 80.

 The first assembly 176, arranged between the island 134 and the second conveyor 108, is capable of closing three of the lower flaps.

 The second set 178, arranged opposite the first set 176, is capable of closing three of the upper flaps of the body 10. It comprises means 182 for adjusting relative to the first set 176 to vary the spacing .

 These two sets of stops each include a first stop 1 84 which is capable of folding the flap placed facing it, and stops 186, 1 88 which form a "V" and which are capable of folding the flaps arranged in the slots 148 .

 According to one embodiment, the shapes of the first set 176 of stops are preformed on the casing 132, and obtained by molding.

 The movable stop 180, capable of pivoting about an axis 190 linked to an extension 92 perpendicular and integral with the lever 170, is provided with rolling means 194 to follow a cam path 96, visible in FIG. 8G , produced by the contour of the cam 1 96. Means 200 for returning, for example a spring, are interposed between the lever 1 70 and the upper part of the movable stop 180, in order to maintain it in a substantially horizontal position as illustrated in FIG. 7, which in particular enables it to be able to bypass the cam 1 96.

 In addition, a plate 202, disposed between the movable stop 1 80 and a flap of the body, can pivot around a horizontal axis 203 linked to the frame 1 30, so that its free lower end 204 is capable of pushing the movable part 1 54 of the island 134, and that one of its lateral faces 206 is capable of folding said flap, as illustrated in FIGS. 8C to 8G.

 As illustrated in FIG. 9, the central part comprises means 208 for pivoting a quarter turn of the island 134, in the opposite direction from the mechanical actuator 150.

 These pivoting means 208 comprise an actuator 210 secured to the axis of rotation 175 of the lever 170, and means 212 for selecting the alternating pivoting of the island 134, secured to the pivot axis 146 of the island.

 These means 212 for selecting the pivot consist of a first plate 214 secured to the axis 146, and a second plate 216, attached to the first, which can pivot around an axis 218, vertical, secured to the first plate 214 , elastic return means 220 making it possible to press the second plate 216 against the first 214.

 Thus when the operator actuates the lever 1 70 in the direction indicated by the arrow 222, the actuator 210 comes to bear against the second plate 216 which can pivot around the axis 218, without rotating the pivot axis 146 of the island. From a certain angle of rotation, the actuator 210 escapes the second plate 21 6 which returns to bear against the first plate 214 under the effect of the elastic return means 220. Thus when the lever is actuated in the direction indicated by the arrow 224, the actuator 210 bears against the second plate 216, and drives it in rotation. In this direction of rotation the second plate 216 is pressed against the first plate 212 which it drives in rotation as well as the pivot axis 146 of the island. The different elements of the pivoting means 208 are arranged and dimensioned in such a way that the island pivots a quarter of a turn when the lever 1 70 is operated. Thus, after having evacuated the body, the island 1 34 pivots d 'a quarter turn, to return to its original position as shown in Figure 6, to isolate again a lot of six bottles.

 In addition, the boxing device 100 can also be equipped with a magazine 230, shown in dotted lines in FIG. 6, in which the blanks of the boxes are stored, and a device 232 for closing the boxes using adhesive tapes, also shown in dotted lines in FIG. 6.

 The operation of the casing device 100, used to place a batch of six bottles in an American box, is now described with reference to FIGS. 6, 7, and 8A to 8G.

 The bottles from a bottling line 102 are diverted towards the conveyor 104 supplying the casing device 100, where they are then distributed over the two lines 124, 1 25 by means 1 1 6 of distribution, visible in figure 6.

 The bottles on the first conveyor are routed to the island 1 34 where they are grouped by six, as shown in Figure 8A. As soon as the pressure exerted by the bottles located against the plate 1 58 is sufficient, the island performs a quarter turn in order to isolate a batch of six bottles, as illustrated in FIG. 8B. Then, the operator puts on a box 1 0, for example according to the description given with regard to FIGS. 1, 2 and 3, the bottom directed upwards, with the upper flaps 501, 502, 503, 504 at the bottom, and the lower flaps 521, 522, 523, 524 at the top, the flap 504 being disposed facing the movable stop 1 80, the flaps 501 and 503 being inserted into the slots 148, as shown in FIG. 8C.

 By thus placing the box 10, the operator immediately checks whether the connecting means 38 are properly hooked.

 As soon as the box 10 is arranged around the lot, the operator with one of his hands presses on the flap 522 in order to fold it, while with the other hand he actuates the lever 1 70 using the handle maneuver 1 74. The movable stop 1 80 rotates the plate 202, the end 204 pushes the movable part 1 54 of the island and the side face 206 begins to fold the flap 504, as shown in Figure 8D.

 In FIG. 8E, the plate 202 has finished folding the flap 504, the movable part 1 54 is retracted in the fixed part 152, and the pusher 1 72 comes into contact against the body 10. In this position, the plate 202 ensures the support of the bottles above it.

 In FIG. 8F, the filled box 10 begins to be evacuated using the pusher 172, the movable stop 1 80 slides under the island 1 34 while pivoting slightly around its axis 1 90. The plate 202 and the movable part 1 54 return to their initial position. In this position, the force exerted by the return means 200 on the stop 1 80 is greater than the weight of said stop, so that the latter does not pivot fully, but slides against the underside of the island 1 34.

 In FIG. 8G, the box is evacuated by the pusher 172. The movable stop continues to slide under the island 134, the return means 200 having a tendency to rotate it clockwise.

 The flaps 502 and 522 are folded using the stops 184, then the stops 186, 188 close the flaps 501, 503, 521, 523.

 When the operator pulls on lever 170 to return it to its initial position, the island pivots a quarter of a turn, and reposition itself as in Figure 6. The casing device is then ready to crate a new lot of six bottles.

 This boxing device described above is semi-automatic, to obtain the automatic version the operator's actions are replaced by mechanical actuators known to those skilled in the art.

 According to another less automated embodiment, the operator can rotate the island 134, the mechanical actuator 1 50 is then eliminated as well as the detection means 1 56 and the pivoting means 208.

 The casing device of the invention is obviously not limited to the embodiment shown and described above, but covers all variants, in particular with regard to the number of insulated bottles, the box used, as well as the shape and the arrangement of the different elements.

Claims (12)

 1. Box intended for the packaging of at least one object, in particular batches of objects of substantially cylindrical or partially cylindrical shape, characterized in that it comprises at least two lateral faces (18, 20) connected together by areas (26, 28) of less rigidity, and at least one bottom (14).  2. Box according to claim 1, characterized in that one of the side faces is produced in two parts (34, 36) connected together by means (38) of connection.  3. Box according to claim 2, characterized in that the means (38) of connection are produced by interlocking, by virtue of conjugate forms of the two parts (34, 36) of one of the side faces.  4. Box according to claim 1, 2 or 3, characterized in that it comprises a top (16), and in that the bottom (14) and the top (16) are each made by at least one flap attached to one of the side faces by a fold line (60).  5. Box according to any one of the preceding claims, characterized in that it comprises  - four lateral faces (18, 20, 22, 24) of substantially shape  rectangular, perpendicular to each other and linked two by two by  areas (26, 28, 30, 32) of less rigidity,  - a bottom (14) produced by lower flaps (52.1, 52.2, 52.3, 52.4)  attached to the side faces (18, 20, 22, 24) by fold lines  preformed (60.1, 60.2, 60.3, 60.4), and  - a top (16) produced by upper flaps (501, 502, 503, 50.4)  attached to the side faces (18, 20, 22, 24) by fold lines  preformed (541, 542, 543, 544).  6. Blank for making, from a sheet, a box according to claim 1, characterized in that it comprises a central part (40) produced by the lateral faces (18, 20), and the zones (26, 28) of less rigidity, arranged alternately, the bottom (14) being connected to at least one of the lateral faces by a preformed fold line (60).  7. Blank for making, from a sheet, a box according to claim 5, characterized in that it comprises a central part (40) produced by the four lateral faces (18, 20, 22, 24), between which are interspersed with the zones (26, 28, 30, 32) of less rigidity, the two parts (34, 36) forming one of the lateral faces (24) being arranged at each end of the central part (40), the upper flaps (501, 502, 50.3, 504) and the lower flaps (521, 522, 523, 524), of length l / 2, being arranged on each side of said central part (40), and attached to the lateral faces ( 18, 20, 22, 24) respectively by the preformed fold lines (541, 542, 543, 544), and the preformed fold lines (601, 602, 603, 604), the lower and upper flaps (504, 524 ) attached to the lateral face (24) being made astride the two parts.  8. Blank according to claim 6 or 7, characterized in that the zones (26, 28, 30, 32) of less rigidity are obtained by crushing the sheet in said zones using a profile (41) d adapted crushing.  9. Blank according to claim 8, characterized in that the crushing varies in density and / or in depth progressively along the median axis (42) of the blank so that it is weak at the junction of the lateral faces and zones of less rigidity, and maximum in the middle of said zones.  10. Blank according to claim 8 or 9, characterized in that the profile (41) of crushing consists of a succession of sinusoidal curves.  11. Blank according to any one of claims 7 to 10, characterized in that the upper flaps (501, 502, 503, 504) and / or the lower flaps (521, 512, 523, 524) are distinct and separated between them by cutting lines (56), a recess (58) made between each flap in line with each zone (26, 28, 30, 32) of less rigidity allowing to obtain forms of flaps adapted to the section of the checkout.  12. Blank according to any one of claims 7 to 10, characterized in that the upper flaps (501, 502, 503, 504) and / or the lower flaps (521, 512, 523, 524) are interconnected by fold lines (64) perpendicular to the fold lines (60), two of the flaps arranged facing each other being provided with fold lines (66) to 450 to form bellows (68) by which the closure of the flaps is possible, and in that recesses (62) made between each flap in line with each zone (26, 28, 30, 32) of less rigidity make it possible to perfectly adapt the shape of the flaps to the section of the body.