EP1494926B1 - Assembly of blanks and box with polygonal cross-section - Google Patents

Abstract

The invention concerns an assembly of blanks and a box made of corrugated sheet or the like designed to form a box (36) with polygonal cross-section. The box comprises a first blank including a series of four panels (3, 4, 5, 6), each panel comprising on one side a free edge (12, 13, 15, 16) and on the other a flap (10, 11, 17, 18) arranged opposite the adjacent panel, bonded on the bottom or on the lid. It further comprises second and third blanks (21, 28) designed respectively to form the bottom and the lid of the box, each including a central flap (22, 29) provided with two opposite free edges (26, 27, 33, 34) and two opposite lateral flaps (23, 24, 30, 31), bonded at right angle with the respective free edges (12, 13, 15, 16) of the adjacent flaps.

Description

The present invention relates to a set of sheet blanks made of cardboard or the like intended to form a box with polygonal section having side faces, an upper face forming a lid and an inner face forming the bottom of the box.

It also concerns such a fund.

Already known (JP 59 115238A) polygonal boxes, in particular adapted to be mounted around mandrel from blanks constituted by a sequence of flaps provided on each side of flaps assembly intended to form the bottom and the crate cover.

Such cases have advantages especially at the time of assembly and also in compressive strength.

Nevertheless, they will not always allow the constitution of solid and stable piles when stacking these boxes on pallet insofar as the boxes can slide relative to each other.

Alternatively these boxes have lower and / or upper faces with discontinuous surfaces, not sealed, because formed of several parts of flaps more or less joined.

The present invention aims to provide a set of blanks and a box polygonal section better than those previously known to the requirements of practice, particularly in that it allows a good blocking both side and vertical corrugated boxes corrugated by compared to others while providing lower and upper body sides in one piece.

It also allows an economical manufacture of the boxes through the implementation of blanks cut together, flat, which minimizes cardboard losses.

Thanks to the invention, it is also possible to optimize the type of cardboard used, for example by choosing different cardboard qualities for the cover, the belt and / or the bottom. Thus, the strengths of these three parts of the body, will be able to vary, which has a significant advantage.

For this purpose, the invention essentially proposes a set of blanks of corrugated cardboard sheet material or equivalent intended to form a box with polygonal section having side faces, an upper face forming a lid and a lower face forming the bottom of the box , characterized
in that it comprises a first blank adapted to constitute the lateral faces of the body, said first blank comprising a series of four rectangular flaps terminated by a fastening tongue, interconnected by parallel fold lines, each flap comprising one side a free edge perpendicular to said fold lines and the other side a flap disposed in opposition to the flap of the adjacent flap, said flaps being arranged to cover the outer surface of said upper face or said lower face to to be glued,
and in that it comprises a second and a third blank respectively intended to form the bottom and the lid of the box, each having a central flap to form the lower or upper face, each central flap being provided with two opposite free edges and two opposite side flaps arranged to cover at least partially the outer surface of two opposite flaps adapted to form the side faces, to the right of the respective free edges of said flaps, to be glued.

• les rabats de deux volets opposés de la suite de volets propres à former les faces latérales ont des bords latéraux de forme complémentaire ou adaptables aux bords latéraux des rabats des volets adjacents de ladite suite de volets ;
• les rabats de la suite de volets sont de forme trapézoldale ;
• les bords libres supérieurs de deux des volets latéraux destinés à former les parois latérales de la caisse sont munis d'au moins un téton de gerbage,

et les lignes de pliage des rabats du volet central de la paroi de couvercle comporte une ou plusieurs encoches correspondantes ;

• - au moins deux flans parmi les premier, deuxième et troisième flans sont en carton ondulé de qualité et/ou d'épaisseur différentes.

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

• the flaps of two opposite flaps of the sequence of shutters suitable for forming the lateral faces have lateral edges of complementary shape or adaptable to the lateral edges of the flaps of the adjacent flaps of said sequence of flaps;
• the flaps of the flap suite are trapezoidal in shape;
• the upper free edges of two of the lateral flaps intended to form the side walls of the box are provided with at least one stacking nipple,

and the fold lines of the flaps of the central flap of the cover wall comprises one or more corresponding notches;

• at least two blanks among the first, second and third blanks are of corrugated cardboard of different quality and / or thickness.

For example, the first blank is of thin double-sided cardboard, for medium compressive strength, the double-double or double-sided cardboard bottom of thick to support heavy products and the corrugated cardboard cover double face of medium thickness, to allow a good grip for suction cups.

The invention also proposes a box obtained with a set of blanks as described above.

It also proposes a box polygonal section comprising side faces, an upper face forming a lid and a lower face forming the bottom of the box, characterized
in that two opposite lateral faces are devoid of flap on the side of the lid and provided with flaps on the bottom side, and two other opposite faces are devoid of flap on the side of the bottom and provided with flaps on the side of the lid, said flaps being respectively stuck on the upper and lower sides of the box,
and in that the bottom and the cover are respectively formed of a single central flap provided with two opposite free edges and two opposite side flaps, said flaps being respectively glued to the outer surface of corresponding lateral faces, to the right of the free edges. respective ones of said faces.

Advantageously, the body is arranged to be formed around a mandrel.

The invention will be better understood on reading the following description of an embodiment given hereinafter by way of non-limiting example.

• La figure 1 est une vue de dessus en plan de premiers flans appartenant à un ensemble selon un mode de réalisation de l'invention.
• Les figures 2 et 3 donnent des vues en plan des deuxième et troisième flans destinés à former respectivement le fond et le couvercle d'une caisse selon le mode de réalisation de l'invention plus particulièrement décrit ici.
• La figure 4 est une vue en perspective d'une boîte ouverte, dénuée de couvercle, obtenue à partir des flans des figures 1 et 3.
• La figure 5 est un schéma synoptique en perspective, montrant les étapes de formation de la boîte de la figure 4.
• La figure 6 montre en perspective, l'emboîtement vertical de deux caisses formées selon la figure 4.

The description refers to the accompanying drawings in which:

• Figure 1 is a top plan view of first blanks belonging to an assembly according to one embodiment of the invention.
• Figures 2 and 3 show plan views of the second and third blanks for respectively forming the bottom and the lid of a box according to the embodiment of the invention more particularly described here.
• Figure 4 is a perspective view of an open box, devoid of cover, obtained from the blanks of Figures 1 and 3.
• Fig. 5 is a perspective schematic diagram showing the steps of forming the box of Fig. 4.
• FIG. 6 shows in perspective, the vertical interlocking of two boxes formed according to FIG.

FIG. 1 shows a plurality of first blanks 1, 1 ', 1 ", 1' '' of corrugated sheet material, for example of small thickness (2 to 3 mm), to form the walls of a box according to the embodiment of the invention more particularly described here.

Each blank 1 comprises a series 2 of four rectangular flaps 3, 4, 5 and 6 terminated by a gluing tab 7, for example trapezoidal, interconnected by first parallel fold lines 8.

Each flap comprises on one side a free edge perpendicular to said first fold lines 8 and on the other side an isosceles trapezoidal flap connected to the opposite edge of the free edge, by a second fold line 9 perpendicular to the first fold lines 8 .

The flaps are located on either side of the suite, alternately, sometimes on the side which will be that of the bottom of the box, sometimes on the side which will be that of the lid of the box.

More specifically, the suite comprises two identical first rectangular flaps 3 and 6 provided with flaps 10 and 11 located on the same side which will be that of the top of the box, and comprises on the other side two rectilinear free edges 12 and 13, said first flaps being intended to form the transverse lateral faces of the body.

These advantageously each comprise a central recess 14, forming a handle.

The suite 2 also comprises two identical second rectangular flaps 4 and 6 provided with free edges 15 and 16 located on the same side of the suite as the flaps 10 and 11 of the first two flaps 3 and 5, each provided respectively with a flap 17. and 18 located on the same side of the suite as the free edges of the shutters 3 and 5.

These two flaps 4 and 6 are in turn intended to form the longitudinal side faces of the body.

In the embodiment more particularly described the free edges 15 and 16 of the flaps 4 and 6 are respectively provided with two pins 19 for locking the lid and / or stacking. The nipple is for example formed by a small rectangle located in the extension of the side face, 1 to 2 mm in height.

Symmetrically the flaps 17 and 18 are terminated on the side opposite the fold lines 9, by a free edge comprising two notches 20 of complementary shape to that of the nipples, so that the cardboard falls are minimized during flat cutting (cf. 1), the nipples 19 'of a blank 1' embedded in the notches 20 "of the directly adjacent blank 1".

The edges of the flaps 10 ', 11' of the blank 2 'are also in contact with the free edges 12 ", 13" of the adjacent blank 1 ", which minimizes cardboard losses.

In the embodiment more particularly described here, the second fold lines 9 between flaps and flaps are shifted slightly, for example half a thickness of cardboard, relative to the free edges of the adjacent flaps.

In another embodiment, they are aligned with said edges.

Figure 2 shows a plan view of a second blank 21 for forming the bottom of the box.

The blank 21 comprises a rectangular central flap 22 adapted to form the underside of the body, in one piece, and two trapezoidal flaps 23 and 24, opposite, connected on both sides to the flap 22 by fold lines 25. The other two opposite edges 26 and 27 of the flap 22 are free.

The flaps 23 and 24 are intended to be glued on the outer faces of the flaps 3 and 5, forming the transverse lateral walls of the body.

Figure 3 shows a plan view of the third blank 28 for forming the lid of the box.

The blank 28 comprises a rectangular central flap 29 adapted to form the underside of the body, in one piece.

The central flap 29 is provided with two identical trapezoidal flaps 30 and 31, opposite, connected to said flap by fold lines 32 and two free edges 33 and 34. Each fold line 32 has two slots 35 adapted to cooperate with the nipples 19 of the box.

In the following description, we will use the same reference numbers to designate the same elements.

FIG. 4 shows a box 36, open, with a rectangular section, formed from the first blank 1 and the second blank 21.

It has a belt of lateral faces 3, 4, 5 and 6 terminated by a gluing tab, glued on the outer face of the wall 3 adjacent to the flap 6.

The two opposite lateral faces 3 and 5 comprise flaps 10 and 11 in the upper part and are devoid of flaps in the lower part, lower part on the outer surface of which are respectively affixed the flaps 23 and 24 of the central flap 22 of the bottom.

FIG. 5 schematically shows a mode of forming the box 6, by winding a blank 1 around a mandrel (not shown), after bonding the bottom wall 21 to the lower flap 17 of the longitudinal flap 4 of the following 2, in a manner known in itself.

The assembly is wrapped around the mandrel after gluing the second flap 18, the tongue 7, and the flaps 23 and 24, then by plate, by pressurizing (jacks and / or pushing plates) flaps on the outer faces of the concerned shutters in opposite.

Then, after refitting to the vertical and filling the box, it comes to cover the open box by the blank 28 of the lid, the notches or slots 35 coming to fit on the nipples 19, and the previously glued flaps 30 and 31 are closed on the free edges 15 and 16 of the side walls.

The shape of the lateral edges 37 of the flaps 10 and 11 bonded to the outer faces of the central flap 29 of the cover is complementary to that of the edges 38 'of flaps 17', 18 'bonded to the outer face of the central flap 22' of the bottom, which allows the embedding of the bottom of the box from above on the lid of the box below, the dimensions of said flaps being further arranged to allow an edge-to-edge joining of these flaps.

Such embedding, edge to edge, excludes any slippage of a box 36 relative to the other 36 '. (see Figure 6).

As is obvious and as also follows from the above, the present invention is not limited to the embodiments more particularly described. It encompasses all variants and especially those where the body is folded glued, the bottom being simply folded on the suite for tranport.

Claims (10)

1. Set of blanks made of corrugated cardboard sheet material or equivalent intended to form a case (36, 36') with a polygonal section comprising side faces, an upper face forming a lid and a lower face forming the bottom of the case, said set comprising
   a first blank (1, 1', 1") suitable for constituting the side faces of the case, said first blank comprising a series (2) of four rectangular flaps (3, 4, 5, 6) ending in a fixing tab (7), connected together by parallel folding lines (8), each flap comprising on one side a free edge (12, 13, 15, 16) perpendicular to said folding lines and
   a second and third blanks (21, 28) intended to form the bottom and the lid of the case respectively, each comprising a central flap (22, 29) to form the lower or upper face, each central flap being provided with two opposite free edges (26, 27, 33, 34) and with two opposite side overlaps (23, 24; 30, 31) arranged so as to cover at least partly the outer surface of two opposite flaps suitable for forming the side faces, in line with the respective free edges (12, 13; 15, 16) of said flaps, in order to be glued there, characterised in that each flap of said first blank (1, 1', 1"), comprising on one side a free edge, comprises on the other side an overlap (10, 11, 17, 18) arranged opposite the overlap of the adjacent flap, said overlaps being arranged so as to cover the outer surface of said upper face or of said lower face in order to be glued there.
2. Set of blanks according to Claim 1, characterised in that the overlaps (10, 11) of two opposite flaps (3, 5) of the series of flaps suitable for forming the side faces have side edges (37) complementary in shape to the side edges (38) of the overlaps (17, 18) of the adjacent flaps (4, 5) of said series of flaps.
3. Set of blanks according to Claim 2, characterised in that the overlaps (10, 11, 17, 18) of the series of flaps are trapezoidal in shape.
4. Set of blanks according to any one of the preceding claims, characterised in that the upper free edges (15, 16) of two of the side flaps (4, 6) intended to form the side walls of the case are provided with at least one projection (19),
   and in that the folding lines (32) of the overlaps (30, 31) of the central flap (29) of the lid wall comprises one or more corresponding notches (35).
5. Set of blanks according to any one of the preceding claims, characterised in that at least two blanks out of the first, second and third blanks are made of corrugated cardboard of different quality and/or thickness.
6. Case (36) made of corrugated cardboard sheet material or equivalent, having a polygonal section, comprising side faces, an upper face forming the lid and a lower face forming the bottom of the case, two opposite side faces (4, 6) having no overlap on the side of the lid, and two other opposite faces (3, 5) having no overlap on the side of the bottom and being provided with overlaps (10, 11) on the side of the lid, said overlaps being respectively glued to the upper face, the bottom (21) and the lid (28) being respectively formed of a single central flap (22, 29) provided with two opposite free edges (26, 27; 33, 34) and with two opposite side overlaps (23, 24; 30, 31), said overlaps being respectively glued to the outer surface of two corresponding side faces in line with the respective free edges of said faces, characterised in that the two opposite side faces having no overlap on the side of the lid are provided with overlaps (17, 18) on the side of the bottom,
   and in that said overlaps are glued to the lower face of the case.
7. Case according to Claim 6, characterised in that the overlaps of the side faces constitute excrescences protruding from the outer surfaces of said upper and lower faces, for which the side edges of the overlaps of two adjacent side faces have an adapted or complementary shape, in order to allow nesting with the overlaps of a case arranged below or above.
8. Case according to Claim 7, characterised in that the overlaps of the side faces are trapezoidal in shape.
9. Case according to any one of Claims 6 to 8, characterised in that the upper free edges (15, 16) of two of the side flaps (4, 6) intended to form the side walls of the case are provided with at least one projection (19),
   and in that the folding lines (32) of the overlaps (30, 31) of the wall (29) of the lid comprise one or more corresponding notches (35).
10. Case according to any one of Claims 6 to 9, characterised in that it is arranged so as to be formed around a mandrel.

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