EP2225162B1 - Packing case with centring tab, set of cutouts and method for creating such a case - Google Patents

Description

The present invention relates to a box comprising a bottom forming a half box and a cap, the bottom face of the bottom being provided with recesses and the cap having tabs on its upper face, above the recesses, of complementary shape.

It also relates to a set of blanks for the constitution of such a box and a manufacturing method from said set.

It finds a particularly important, although not exclusive, application in the field of stackable crates on pallets, which may tend to slide relative to each other during handling or during transport phases.

We already know cash centering systems to prevent slippage, lateral pins cooperating with orifices placed on the edges, or nearby.

Such systems are fragile and are not resistant to repeated manipulation.

We also know ( FR-A-2311717 ) packagings whose lid is formed of flaps, some of which are of complementary shape to that of indentations in the bottom also formed of flaps, allowing a recess and thus a lateral locking.

In addition to such an embodiment imposing a form of blank with a double play of flaps, it is not appropriate to not at the low basis weight and does not always allow a perfectly vertical stacking, due to shifts that may exist during the formation of the box.

Also known is a box with a tab cap glued to the upper face thereof. The tabs are cut and folded upside down, thereby presenting a double fold line.

If such a box allows good centering and excellent blocking, it is not always easy to mount given this specificity related to the flipping of the tongue.

The document FR-A-2,761,341 discloses a box, a set of blanks and a mounting method according to the preamble of claims 1, 12 and 22.

The present invention aims to provide a box, a set of cuts and a mounting method that better than those previously known to the requirements of practice, in particular because on the one hand it proposes a centering of the boxes one on the other making possible a perfect stacking of crates and secondly it allows a formation of boxes simple and inexpensive.

With the invention it will therefore be possible to prevent slippage packaging when stacked on each other during their palletization and thus allow the use of light weight, and avoiding the use of costly palletizing accessories and additional handling generators.

For this purpose, the present invention proposes in particular a packaging box comprising a bottom forming a half-box obtained from a first cut and a cap formed by a second cut, the bottom face of the bottom being provided with recesses and the cap with at least two tabs glued on its upper face, in line with the recesses of complementary shape, and that the cap comprising a central panel provided on its sides with four lateral panels, two of which are provided with end flaps, said tongues are each respectively connected to one of said end flaps.

• le panneau central est rectangulaire, les panneaux latéraux comprenant deux premiers panneaux latéraux opposés, reliés audit panneau central par des premières lignes de pliage, comportant de par et d'autre lesdits rabats d'extrémité formant des coins renforcés reliés audits premiers panneaux par des troisièmes lignes de pliage, les languettes étant elles même respectivement reliées au bord supérieur desdits rabats correspondant par des quatrièmes lignes de pliage et deux deuxièmes panneaux latéraux opposés reliés audits panneau central par des deuxièmes lignes de pliage, dénués de rabats ;
• le panneau central comporte des fentes de passages des languettes au niveau des deuxièmes lignes de pliage entre panneau central et deuxièmes panneaux latéraux, lesdits premiers panneaux latéraux étant rabattus vers le bas pour coopérer avec les faces latérales de la demi-boîte en vis à vis, lesdits rabats étant repliés sur les angles correspondant, les dites languettes traversant lesdites fentes et étant rabattues et collées sur la face supérieure du panneau central avec collage des deuxièmes panneaux latéraux sur la face externe desdits rabats ;

• les rabats d'extrémité sont collés sur les deuxièmes panneaux latéraux, les languettes étant rabattues et collées sur la face supérieure du panneau central ;
• la coiffe est amovible ;
• les premiers et/ou les deuxièmes panneaux latéraux sont collés sur les faces latérales adjacentes de la demi-boîte. Dans ce cas, les produits sont placés dans la demi-boîte avant collage de la coiffe ;
• la première découpe comporte une suite d'au moins quatre volets principaux reliés entre eux par des premières lignes de jonction terminée par une languette de fixation, ladite suite étant reliée d'un coté par une deuxième ligne de jonction à une suite de rabats formant la face inférieure dudit fond, deux desdits rabats comportant chacun au moins un bord latéral muni d'une échancrure propre à former lesdits évidements ;
• la première découpe comporte une suite de trois volets reliés entre eux par des troisièmes lignes de jonction munis de part et d'autre par le biais respectivement de quatrièmes et de cinquièmes lignes de jonction d'une première et d'une seconde suite de rabats, et en ce que le volet central de ladite suite de volets est muni d'au moins deux évidements ;
• chacun desdits évidements est situé en bordure d'une ligne de jonction avec un rabat adjacent audit volet central ;
• les évidements sont situés en bordure ou au voisinage des premières lignes de jonction avec chacun des volets adjacents au volet central ;
• la face inférieure du fond comporte quatre évidements disposés sensiblement aux quatre coins de la boîte, la coiffe comportant quatre languettes correspondantes sur sa face supérieure.

In advantageous embodiments, one and / or the other of the following provisions is also used:

• the central panel is rectangular, the side panels comprising two opposite first side panels, connected to said central panel by first fold lines, having on either side said end flaps forming reinforced corners connected to said first panels by thirds fold lines, the tongues themselves being respectively connected to the upper edge of said corresponding flaps by fourth fold lines and two opposite second side panels connected to said central panel by second fold lines, devoid of flaps;
• the central panel has slots for passage of the tongues at the second fold lines between the central panel and second side panels, said first side panels being folded down to cooperate with the lateral faces of the half-box facing each other, said flaps being folded over the corresponding angles, said tabs passing through said slots and being folded and glued to the upper face of the central panel with gluing of the second side panels on the outer face of said flaps;

• the end flaps are glued to the second side panels, the tabs being folded and glued to the upper face of the central panel;
• the cap is removable;
• the first and / or second side panels are glued to the adjacent side faces of the half-box. In this case, the products are placed in the half-box before gluing the cap;
• the first cut comprises a sequence of at least four main flaps interconnected by first joining lines terminated by a fixing tab, said suite being connected on one side by a second connecting line to a series of flaps forming the bottom face of said bottom, two of said flaps each having at least one side edge provided with a notch adapted to form said recesses;
• the first cut comprises a sequence of three shutters interconnected by third connecting lines provided on each side by means of fourth and fifth joining lines of a first and a second flap series respectively; and in that the central flap of said flap sequence is provided with at least two recesses;
• each of said recesses is located at the edge of a junction line with a flap adjacent to said central flap;
• the recesses are located at the edge or in the vicinity of the first junction lines with each of the flaps adjacent to the central flap;
• the lower face of the bottom has four recesses substantially disposed at the four corners of the box, the cap having four corresponding tabs on its upper face.

The invention also proposes a set of cutouts for obtaining such a box.

It also proposes, in particular, a set of blanks of corrugated cardboard sheet material or equivalent intended to form a box, namely a first cutout suitable for forming the bottom of the box and a second cutout suitable for forming the cap of said box, said first blank comprising recesses and said second blank comprising a rectangular central panel provided on each side with a rectangular side panel, namely two opposite first side panels connected to said central panel by first folding lines and two opposite opposite second side panels; central panel by second fold lines, and that the first two opposite side panels are respectively connected on each of their lateral sides to end flaps by third fold lines, to form reinforced corners, and in that at least two end flaps are connected to a tongue bonding by a fourth fold line perpendicular to the third fold line of the corresponding flap, said tongues being directed to said second side panels when the second cut is flat, and being adapted to be glued on the upper face of the cap when it is formed in line with the recesses of complementary shape.

Advantageously, the central panel has slots for passage of the tongues at the second fold lines between central panel and second side panels, said tabs being adapted to pass through said slots and to be folded and glued to the upper face of the central panel.

In another advantageous embodiment, the lateral edges of the second lateral panels comprise indentations.

Also advantageously the indentations are of complementary shape to that of the tongues.

Advantageously, the second cutout comprises four tongues.

In another advantageous embodiment, the first cut comprises a sequence of at least four main flaps interconnected by first joining lines and terminated by a fixing tab, said suite being connected on one side by a second joining line. a series of flaps forming the underside of said bottom, two of said flaps each having at least one side edge provided with a notch proper to form said recesses.

The invention also proposes a method for producing a packaging box from a set of two blanks of cardboard sheet or corrugated cardboard material as described above in which the cap is formed by applying the tongues previously glued on the upper side, with hotmelt glue.

In an advantageous embodiment, the central panel being provided with slots at the junction lines with the side panels, the side panels provided with flaps are pre-folded, the flaps are pre-folded, the tongues are then inserted vertically in the slots, and then the side panels without flaps are applied, the tongues are glued and applied to the upper face.

In another advantageous embodiment, the first and second side panels are folded, and after gluing the internal faces of the flaps the flaps are applied and finally the tongues are applied to the upper face.

Advantageously, after gluing the panels, flaps and tongues, the side panels are applied to the side faces of the half box, before applying the flaps and tabs on the upper face of the cap.

The present invention will be better understood on reading the following description of embodiments given below by way of non-limiting examples.

• La figure 1 est une vue de dessus en plan d'une première découpe selon un premier mode de réalisation de l'invention.
• La figure 2 est une vue de dessus en plan d'une deuxième découpe selon un premier mode de réalisation de l'invention.
• Les figures 3A à 3D montrent en perspective la formation sur une demi boîte d'une coiffe à partir de la deuxième découpe de la figure 2.
• La figure 4 est une vue en perspective montrant l'emboîtement de deux boîtes obtenues à partir de première et deuxième découpes selon des modes de réalisation de l'invention.
• La figure 5 est une vue de dessus en plan d'une deuxième découpe selon un deuxième mode de réalisation de l'invention.
• Les figures 6A à 6D montrent en perspective la formation sur une demi boîte d'une coiffe à partir de la deuxième découpe de la figure 5.
• Les figures 7A, 7B et 8A, 8B sont des vues de dessus en plan d'autres modes de réalisation de dernières découpes selon l'invention à quatre languettes.
• Les figures 9, 10A et 10B sont des vues de dessus en plan d'autres modes de réalisation de deuxièmes découpes selon l'invention à deux languettes.
• La figure 11 est une vue en plan d'un mode de réalisation d'une premièe découpe à deux évidements, agencés pour coopérer avec deux languettes de première découpe correspondante.
• La figure 12 montre une vue en plan d'un agencement de deuxièmes découpes, s'imbriquant les unes dans les autres selon un mode de réalisation de l'invention optimisant l'utilisation du carton.
• Les figures 13, 14 et 15 donnent des modes de réalisation de première découpe, selon l'invention, à trois volets.

The description refers to the accompanying drawings in which:

• The figure 1 is a top plan view of a first blank according to a first embodiment of the invention.
• The figure 2 is a top plan view of a second blank according to a first embodiment of the invention.
• The Figures 3A to 3D show in perspective the formation on a half box of a cap from the second cut of the figure 2 .
• The figure 4 is a perspective view showing the nesting of two boxes obtained from first and second cuts according to embodiments of the invention.
• The figure 5 is a top plan view of a second blank according to a second embodiment of the invention.
• The Figures 6A to 6D show in perspective the formation on a half box of a cap from the second cut of the figure 5 .
• The FIGS. 7A, 7B and 8A, 8B are top plan views of other embodiments of last cuts according to the invention with four tabs.
• The Figures 9, 10A and 10B are top plan views of other embodiments of second cutouts according to the invention with two tabs.
• The figure 11 is a plan view of an embodiment of a first cut with two recesses, arranged to cooperate with two corresponding first cut tabs.
• The figure 12 shows a plan view of an arrangement of second cuts, interlocking with each other according to one embodiment of the invention optimizing the use of the carton.
• The Figures 13, 14 and 15 give embodiments of first cut, according to the invention, three parts.

The Figures 1 and 2 show a set of blanks for the constitution of a corrugated packaging box for example 2 to 3 mm thick, comprising two cutouts.

A first cut 1 to form the bottom of the box and a second cut 2 clean to form the cap of the box.

The first cut comprises a succession of four shutters 3, 4, 5, 6, rectangular heads interconnected by first connecting lines 7 parallel to each other and terminated by a fastening tab 8 also rectangular, for gluing the tongue on the external periphery 9 of the flap vis-à-vis during the formation of the half-box.

The sequence of flaps is connected on one side by a second junction line 10 perpendicular to the lines 7, to a succession of flaps 11, 12, 13, 14, substantially rectangular, two of said opposite flaps 12 and 14, having on their edges respective sides 15, 16, 17, 18 of the notches 19, able to form recesses when the bottom of the half-box is formed.

More specifically, these notches are for example of substantially trapezoidal shape or having a contour in a portion of a circle or oval complementary to those of the tabs which will be described below, for example located at half of the flap on a third of its height .

The other two flaps 11, 13 are devoid of indentations on their sides.

Finally the other side of the sequence of shutters is devoid of flap.

The figure 2 shows, meanwhile, the second cut 2 own to form the cap of the box.

The second cutout comprises a rectangular central panel 20 provided on each side with a rectangular lateral panel 21, 22, 23, 24, namely two first opposite side panels 21, 23, connected to the central panel by first folding lines 25 and 22. two opposite second side panels 22 and 24, connected to said central panel by second fold lines 26, perpendicular to the first fold lines.

The first two opposite side panels 21 and 23 are respectively connected on each of their lateral sides to rectangular end flaps respectively 27, 28 and 29, 30 by third fold lines 31 in the extension of the second fold lines 26 to form reinforced corners.

Each of these four end flaps 27, 28, 29, 30 has, on its lateral edge 32 directed, when the second cut is flat, to the adjacent flap, a gluing tab 33, via a fourth fold line 34 perpendicular to the third fold line 31 of the corresponding flap.

The tongues 33 are adapted to be glued on the upper face of the cap when it is formed above the recesses and of complementary shape to the latter, to allow a recess of one into the other, as described in FIG. reference to cutting 1.

The central panel 20 has slots 35 for passage of the tabs at the second fold lines 26 between the central panel 20 and the second side panels 23, 24, located at a distance d from the angle 36 of the central panel. The tabs are located at the same distance d, and have a width and thickness a little less than those of the slots to cross and be folded and glued to the upper face of the central panel.

To do this, and in one embodiment to promote folding, the fold line 34 is slightly offset to the outside of the tongue, for example a half-thickness of corrugated cardboard, or a thickness.

The second panels 22 and 24 opposite are, in turn, devoid of side flaps and have a shape on their lateral sides 37 directed to the side of the tabs 33, for example trapezoid rectangle, the flap having a first portion 38 directed at an angle to the inside of the package from the second fold line 26, and a second portion 39 for example parallel to the fourth fold lines 34, so that when forming the blank or the flat blank, it is obtained a space 37 'to clear the corresponding tongue.

The slots 35 located on the second fold lines corresponding to the second panels indicated above, are, for example, 4 in number (two per line) each placed substantially at a quarter of the length of said line of part and of other of it.

We will now describe, with reference to Figures 3A to 3D , the realization of a packaging box 40 from the cuts described in reference to Figures 1 and 2 . In the following description, we will use the same reference numbers to designate the same elements.

On the figure 3A the central panel is brought flat against the half-box 41 previously formed for example around a mandrel by folding the flaps of the first blank 1 and setting up and closing the flaps to form the bottom of said half-box.

The flaps with the recesses (not visible in the figures) are then glued to the flaps devoid of recesses, so as to form the notches or recesses of the bottom of the box, which will cooperate with the tabs.

With reference to the figure 3B , the side panels 21 and 23 with the flaps 27, 28, 29, 30 are pre-folded, then the flaps are pre-folded, the tongues 23, then vertically aligned in the extension of the plane of the flaps, are fitted into the slots 35, then the side panels 22, 24 devoid of flaps and previously glued on said flaps 28, then the inner faces of the tongues are glued and applied to the upper face of the central panel to form the cap, then the box 40 as it appears to the 3D figure .

We have shown on the figure 4 two boxes 40, as described above overlapping, showing the installation of the tongues 33 in the recesses 19 vis-à-vis the top box.

Such embedding will allow excellent stability between crates in a simple way.

We have shown on the figure 5 another embodiment of a second cutout 42 according to the invention.

This is a cutout consisting of a central panel 20 provided on each of its sides with side panels 21, 22, 23, 24, two of the side panels 21 and 23 comprise flaps 27, 28, 29, 30, themselves provided with tabs 43 for example arranged to match the shape of the side edges 44 of the adjacent side flap 22, 24, providing a small slot 45 around, for example 2 mm to allow good clearance of the tongue by relative to the adjacent carton.

Such a cap will here allow another embodiment whose assembly is described, with reference to Figures 6A to 6D .

It is no longer a matter here of embedding the tongues 43 in slots but simply of giving the shape of a cap to the second cutout 42 described with reference to FIG. figure 5 on the half-box 41, as indicated on the Figure 6A after sizing the internal faces of the flaps 27, 28, 29, 30, and tabs 43.

To do this, for example, we come down ( Figure 6B ) and press the second panels 22 and 24 on the side faces vis-à-vis the half-cap 41, before folding and in turn turn the first side panels 21 and 23 on the adjacent sides vis-à-vis screw, then fold down and press the flaps 27, 28, 29, 30 (see Figure 6C ) and finally to come, apply the tabs 43, glued on the upper face of the panel 20 of the box, to obtain the cap and therefore the package 44, shown in FIG. Figure 6D .

We have shown on Figures 7A and 7B then 8A and 8B embodiments of second cuts according to the invention 50, 51, 52, 53, each of the cuts having four tabs of different type, namely ( Figures 7A and 7B ) tabs 54, 55, 56, 57 attached to flaps, directed to the small panels 22, 24, with indentations 58, 59, or corresponding to the shapes of the tabs (notch 58-cf. Figure 7A ), or corresponding to a half trapezium allowing the tongue to be left free vis-à-vis (notch 59 - cf. Figure 7B ).

The second embodiment of cuts corresponding to Figures 8A, 8B , this time shows examples of embodiment with flaps 60, 61, 62, 63 on the small panels which have their outer edge heights, equal or different (flap 60), smaller (flap 62) or larger ( flaps 61, 63), with respect to the height of said second panel and which, in the latter case, have recesses for example with an outer edge running in an outwardly sloping manner 64 or inward 65, of the cut by relative to the outer periphery of the panel to which the flap is attached before returning to a rectangular shape.

The Figure 9, 10A and 10B show other embodiments of second cutouts 70, 71, 72 comprising only two tabs on two diagonal outer flaps, with either a notch 76 in the adjacent panel 77 surrounding the tongue, or a notch 78 in the shape of a half trapezoid in the adjacent panel 79, an open notch 80 to the outside and of complementary shape to the tongue in the side panel 81.

The panels 77, 79 or 81 also have another right lateral edge facing the flaps devoid of tongue.

The first corresponding cut 82 (cf. figure 11 ) has, like the cutout described with reference to the figure 1 , flaps 83, 84 forming the bottom which, this time, are provided for two opposite flaps 84, only a notch 85, on their lateral sides, adapted to cooperate with the tongue when the package will be formed.

We have shown on the figure 12 a panel 86 or width of corrugated cardboard to optimize the consumption of cardboard for second cuts 87, designed complementary shape to obtain caps according to the invention, here, two tabs 88 arranged in the diagonal.

In these embodiments, the second side panels 89, include recesses 90 on their upper edge.

Finally, we reproduced on Figures 13,14 and 15 other embodiments of first cutouts 91, 92, 93 according to the invention.

Here, each first cut comprises a series of three flaps 94, 95, 96, interconnected by third parallel connecting lines, and are provided on either side and respectively via a fourth 98 and fifth. 99 junction lines parallel to each other, with a first 100 and a second 101 following flaps, substantially rectangular, namely three flaps 102, 103, 104 and 105, 106, 107.

On the embodiment of the figure 13 , the central flap 95 comprises on its fourth and fifth lines 98, 99 with the flaps 103 and 106, junction, two rectangular or substantially rectangular recesses 108 on either side, vis-à-vis, or four recesses in all.

In the embodiment of the figure 14 here, the recesses are situated two by two, at the edge 109, or at the vicinity 110, of a first line 97 joining with each of the adjacent flaps 94, 95, here again of substantially rectangular shape corresponding to the tongue.

Finally, on the figure 15 another embodiment of a first cutout 93 according to the invention has been shown, for which the lower face of the central flap 95 comprises only two identical recesses 111 or of the type of the recesses 105, arranged diagonally on the central flap at the junction lines 98, adapted to cooperate this time with tabs of the type described on the second cutouts with reference to the Figures 9, 10A, 10B and 12 .

As goes without saying and as it follows from the foregoing, the present invention is not limited to the embodiments more particularly described. It encompasses all variants and especially those where the shape of the tabs is different.

Claims (25)

1. Packing box (40), comprising a bottom forming a half-box (41) obtained from a first blank and a top formed by a second blank, the lower face of the bottom being provided with openings (19, 85, 108, 109, 110, 111) and the top having at least two tabs (33, 43, 54, 55, 56, 57, 73, 74, 75, 88) glued on its upper face, plumb with the openings of complementary shape, characterised in that the top comprises a central panel (20, 87) provided on its sides with four lateral panels (21, 22, 23, 24; 77, 79, 81) of which two (21, 23) are provided with end flaps (27, 28, 29, 30), said tabs each being connected to one of said end flaps.
2. Box according to claim 1, characterised in that the central panel (20, 87) is rectangular, in that the lateral panels comprise two opposing first lateral panels (21, 23) connected to said central panel by first fold lines (25) having on either side said end flaps forming reinforced corners connected to said first panels by third fold lines (31), the tabs (33) being themselves respectively connected to the upper edge of said corresponding flaps by fourth fold lines (34) and two opposing second lateral panels (22, 24) connected to said central panel by second fold lines (26), devoid of flaps.
3. Box according to claim 2, characterised in that the central panel (20) has slots (35) for passage of the tabs (33) at the second fold lines (26) between the central panel and second lateral panels, in that said first lateral panels (21, 23) are folded downwards to cooperate with the facing lateral faces of the half-box, said flaps (27, 28, 29, 30) being folded at the corresponding angles, said tabs (33) passing through said slots (35) and being folded down and glued to the upper face of the central panel (20) with the second lateral panels (22, 24) glued to the external face of said flaps.
4. Box according to claim 2, characterised in that the end flaps (27, 28, 29, 30) are glued to the second lateral panels (22, 24), the tabs (33) being folded down and glued to the upper face of the central panel (20).
5. Box according to any one of the preceding claims, characterised in that the top is detachable.
6. Box according to any one of claims 1 to 4, characterised in that the first and/or the second lateral panels (21, 22, 23, 24) are glued to the adjacent lateral faces of the half-box.
7. Box according to any one of the preceding claims, characterised in that the first blank (1, 82) has a series of at least four main sections (3, 4, 5, 6) connected to one another by first junction lines (7) terminated by a fixing tab (8), said series being connected on one side by a second junction line (10) to a series of flaps (11, 12, 13, 14) forming the lower face of said bottom, two of said flaps (12, 14) each having at least one lateral edge (15) provided with a notch (19) suitable for forming said openings.
8. Box according to any one of claims 1 to 6, characterised in that the first blank has a series of three sections (94, 95, 96) connected to one another by third junction lines (97) provided on either side respectively by means of fourth and fifth junction lines (98, 99) with a first and a second series of flaps, and in that the central section of said series of sections is provided with at least two openings (108, 111).
9. Box according to claim 8, characterised in that each of said openings (108,111) is situated at the edge of a junction line (98, 99) with a flap adjacent to said central section.
10. Box according to claim 8, characterised in that the openings (108) are situated at the edge of or in the vicinity of the first junction lines (97) with each of the sections (94, 96) adjacent to the central section (95).
11. Box according to any one of the preceding claims, characterised in that the lower face of the bottom has four openings (19, 108, 109, 110) disposed substantially in the four corners of the box, and in that the top has four corresponding tabs (33, 43, 54, 55, 56, 57) on its upper face.
12. Set of blanks for the formation of a packing box, comprising two blanks made of corrugated cardboard sheet material, namely a first blank (1, 91, 92, 93) suitable for forming the bottom of the box and a second blank (2, 42, 50, 51, 52, 53, 70, 71, 72, 87) suitable for forming the top of said box, said first blank comprising openings (19, 85, 108, 109, 110, 111) and said second blank having a rectangular central panel (20) provided on each side with a rectangular lateral panel (21, 22, 23, 24), namely two opposing first lateral panels (21, 23) connected to said central panel by first fold lines (25) and two opposing second lateral panels (22, 24) connected to said central panel by second fold lines (26), characterised in that the two opposing first lateral panels are respectively connected on each of their lateral sides to end flaps (27, 28, 29, 30) by third fold lines (31), to form reinforced corners, and in that at least two end flaps (27, 28, 29, 30) are connected to a gluing tab (33, 43, 54, 55, 56, 57, 73, 74, 75, 88) by a fourth fold line perpendicular to the third fold line of the corresponding flap, said tabs being directed towards said second lateral panels (22, 24) when the second blank is laid flat, and being suitable for being glued to the upper face of the top when it is formed plumb with the openings of complementary shape.
13. Set of blanks according to claim 12, characterised in that the central panel (20) has slots (35) for passage of the tabs (33) at the second fold lines (26) between the central panel and second lateral panels when assembled, said tabs (33) being suitable for passing through said slots (35) and being folded down and glued to the upper face of the central panel.
14. Set according to any one of claims 12 and 13, characterised in that the lateral edges of the second lateral panels (22, 24) have notches (37', 44, 58, 59, 76, 78, 80).
15. Set according to claim 14, characterised in that the notches are of a shape complementary to that of the tabs.
16. Set according to any one of claims 12 to 15, characterised in that the second blank has four tabs.
17. Set according to any one of claims 12 to 16, characterised in that the first blank (1) has a series of at least four main sections (3, 4, 5, 6) connected to one another by first junction lines (7) and terminated by a fixing tab (8), said series being connected on one side by a second junction line (10) to a series of flaps (11, 12, 13, 14) forming the lower face of said bottom, two of said flaps each having at least one lateral edge (15) provided with a notch (19) suitable for forming said openings.
18. Set of blanks according to any one of claims 12 to 16, characterised in that the first blank has a series of three sections (94, 95, 96) connected to one another by third junction lines (97) provided on either side respectively by means of fourth and fifth junction lines (98, 99) with a first and a second series of flaps, and in that the central section of said series of sections is provided with at least two openings (108, 111).
19. Set according to claim 18, characterised in that each of said openings (108,111) is situated at the edge of a junction line (98, 99) with a flap adjacent to said central section.
20. Set according to claim 18, characterised in that the openings (108) are situated at the edge of or in the vicinity of a first junction line with each of the sections (94, 96) adjacent to the central section (95).
21. Set according to any one of claims 12 to 20, characterised in that the lower face of the bottom has four openings (19, 108, 109, 110) disposed substantially in the four corners of said face.
22. Method for the production of a packing box from at least two blanks (1, 2) made of cardboard or corrugated cardboard sheet material, according to any one of claims 12 to 21, characterised in that the top is formed by applying the tabs previously coated with glue to the upper face, with hot melt glue.
23. Method according to claim 22, characterised in that as the central panel (20) is provided with slots (35) at the junction lines with the lateral panels, the lateral panels (21, 23) provided with flaps (27, 28, 29, 30) are pre-folded, the flaps of the panels are pre-folded, the tabs then directed vertically are engaged in the slots, then the lateral panels devoid of flaps are applied, glue is applied to the tabs and the tabs are applied.
24. Method according to claim 22, characterised in that the first and second lateral panels are folded, and after the application of glue to the internal faces of the flaps, the flaps are applied, and lastly the tabs are applied to the upper face.
25. Method according to claim 24, characterised in that after the application of glue to the flaps and the tabs, the lateral panels are applied to the lateral faces of the half-box before applying the flaps and the tabs to the upper face of the top.

Images