EP2197752A1

EP2197752A1 - Set of blanks, box and box production method

Info

Publication number: EP2197752A1
Application number: EP08852122A
Authority: EP
Inventors: Sébastien JACOMELLI; Gérard Mathieu
Original assignee: Otor SA
Current assignee: Otor SA
Priority date: 2007-09-28
Filing date: 2008-09-04
Publication date: 2010-06-23
Anticipated expiration: 2028-09-04
Also published as: FR2921638B1; AU2008327747B2; PL2197752T3; MY151256A; ZA201001999B; AU2008327747A1; BRPI0817745B1; CA2700839C; CN101842290A; EP2197752B1; FR2921638A1; JP2010540364A; US8777097B2; JP5451620B2; CN101842290B; US20100264200A1; MA31712B1; CA2700839A1; ES2427597T3; BRPI0817745A2

Abstract

The invention relates to a set (22) of blanks for forming a packaging box, a method and a corresponding box. The set includes two corrugated board blanks, namely: a first blank (2') including flaps connected to one another by first fold lines (9'), one side of said blank having no folds; and a second blank (12') including panels (13', 14', 15', 16') connected to one another by third fold lines (19'), the panels of the second blank being stacked respectively on the part of the first blank having no folds. Two non-adjacent flaps (3', 5') of the first blank are glued to two respective facing panels (13', 15') of the second blank, thereby preventing the relative movement thereof during folding or during the formation of the box when the blanks are wound around a volume having pre-determined dimensions. At least two-thirds of the third fold lines (19') of the second blank are substantially aligned in relation to the first fold lines of the first blank, the lower part (23) of one or more of said third lines including a cut or collapsed portion opposite the corresponding first fold line.

Description

CUTTING ASSEMBLY, BOX AND METHOD FOR MANUFACTURING BOX

The present invention relates to a set of blanks for the constitution of a packaging box of the type comprising two blanks made of cardboard sheet material, at least one of corrugated cardboard, namely a first blank comprising a first

10 at least four main flaps terminated by a fastening tab, interconnected by first fold lines parallel to each other, directly or via intermediate flaps, and provided with a side of a sequence of

15 flaps connected to said first sequence of flaps by second fold lines perpendicular to said first fold lines and devoid of flap on the other side, said first flap sequence being adapted to form the walls of the base 0 of the box and a second cut comprising a second sequence of at least four panels interconnected by third fold lines parallel to each other, said second cut being adapted to form the cap of said box, the panels of the second cut being superposed respectively the part without flap flaps of the first cut.

It also relates to a box obtained with such a set of blanks, as well as the method for the manufacture of such a box.

It finds a particularly important but not exclusive application in the field of reinforced corrugated boxes, as well as in the the field of corrugated boxes or corrugated packaging ready to sell, that is to say intended to remain at least partly in supermarket shelves.

Two-piece flap packages obtained from two blanks or blanks are already known.

These two-piece packaging allow a subsequent separation, part of the remaining packaging then and for example as a display. To obtain such packaging, the outer cutout must have a perimeter greater than that of the inner cut since it comes in extra thickness.

A first solution is to coat the outer cut on the inner cut before gluing, which is complicated, and can not be performed at a high rate (more than twenty cases minute).

Another solution is to previously glue the two blanks with each other before folding them to 180 ° to deliver them folded-junction, or deliver them flat for coating.

But then there is necessarily at the time of 180 ° bending or coating, a very important tension between the cuts, causing either a break of the glue points, a tear cardboard blanks, or an unacceptable deformation of the inner wall of the box.

To solve this problem, it was first proposed (EP 0 637 548), packaging whose inner cap or belt has broad notches at the base of the corner of the side walls. These notches allow indeed the catching games during folding or wrapping by the carton.

But such a solution on the one hand generates a significant compression loss (25% to 30%) and on the other hand results in a lower rigidity of the package.

It is then necessary to increase the weight of the paper and consequently the cost of packaging. It has also been proposed (EP 0 876 281) a package comprising a device for catching the games by sliding between the cuts during folding or coating.

If such a solution is satisfactory in many respects, it nevertheless requires the implementation of elastic or delayed-setting glues, or a frangible portion, allowing a relative movement between cuts in their junction plane. However, such a solution can have a delicate implementation with certain types of cardboard, in particular of low grammage.

The present invention overcomes these disadvantages.

It aims to provide a set of blanks, a box and a box manufacturing process better than those previously known to the requirements of the practice, in particular in that it allows an efficient and fast automatic assembly of boxes without practically generating waste , at high rates (over thirty cans per minute).

The boxes obtained have a high rigidity and excellent resistance to compression and destruction. The invention thus meets the demand of mass retailers, who have been looking for many years for packaging directly on the shelves of linear allowing a good presentation of the products, from traditional cuts and not requiring a complicated manufacturing process or too delicate.

The set of blanks and the box according to the invention meet this demand by proposing a two-piece packaging, formable on the same machines as those currently used by the packagers, not requiring sophisticated cuttings and / or special glue, and this while maintaining high speeds, even with low weights. Excellent compressive strength and good strength of the packaging is maintained throughout the logistics distribution phase, the design of the box also allows an optimized presentation of products by simply pulling the cap at the time of sale.

For this purpose the invention proposes in particular a set of blanks for the constitution of a packaging box, comprising two blanks made of cardboard sheet material, at least one of corrugated cardboard, namely a first blank comprising a first series of at least four main flaps terminated by a fastening tab, interconnected by first fold lines parallel to each other and provided on one side with a succession of flaps connected to said first flap sequence by second fold lines perpendicular to said first fold lines and devoid of flap on the other side, said first sequence of flaps being adapted to form the walls of the base of the box and a second cut comprising a second series of at least four panels interconnected by third fold lines parallel to each other, said second cut being adapted to form the cap of said box, the panels of the second cutout being respectively superimposed on the flangeless portion flaps of the first blank, characterized in that two non-adjacent flaps of the first blank are fixed by gluing and respectively to two panels opposite the second blank , prohibiting their relative movement when folding or forming the box by winding said blanks around a volume of determined dimensions, and in that at least two out of three of the third fold lines of the second blank are substantially aligned by in relation to the first folding lines of the first blank, one or more of said third lines ortant lower part cut or crushed portion opposite the corresponding first fold line.

A cut-off portion is understood to mean a portion which is inserted or slotted in a through manner, for example by a cutting blade or knife, from one end to the other, without removal of material, or in one embodiment, substantially without removal of material.

(ie with a slot of less than one or two millimeters in width), unlike the notches of the prior art.

By substantially aligned, is meant aligned (for example because of the mopping of the raining of the fold line) or in the embodiment more particularly envisaged, slightly offset relative to the fold line vis-à-vis a value corresponding at least to the cumulative value of the thicknesses of the papers constituting the blanks, but nevertheless very small, that is to say a value less than of the order of 1 or 2 mm, or as specified hereinafter, for example, from 0.5 to 0.7 mm between grooves.

The fold lines according to the embodiments of the invention more particularly described are in turn simple lines, that is to say whose groove forms an edge whose ridge is one-sided.

By gluing prohibiting the relative movement, it is necessary to hear a collage preventing the movement in the direction of the plane of the shutters and panels, without tearing and delamination.

On the other hand, such a bonding may allow subsequent separation of the elements of the box thus formed by transversely pulling the one relative to the other manually, to release the cap of the tray base.

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

- the two cuts are made of corrugated cardboard;

- All the third fold lines between panels have a portion cut or crushed at the bottom; - The portion or portions of third fold lines substantially aligned with the first fold lines and located opposite said first fold lines are cut; - The cut is shaped like a butt;

- the cutout is T-shaped;

- The cut or portions are offset from the rest of the third fold line corresponding to the panel glued to the flap facing; this offset is made on the opposite side to the panel glued to the flap vis-à-vis;

the thickness of the carton of the base being E2 and that of the carton of the cap being El, the base being fixed outside the cap, the portion is cut and its offset is substantially less than 1/3 El + 2/3 E2.

By substantially lower, one must hear at least two times inferior; the thickness of the carton of the base being E2 and that of the carton of the cap being El, the base being fixed inside the cap, the offset is substantially less than 2/3 El + 1/3 E2 . the portion or portions of third fold lines substantially aligned with the first fold lines and located opposite said first fold lines are crushed;

the thickness of the carton of the base being E2 and that of the carton of the cap being El, the crushing is carried out over a width greater than 2 x (E1 + E2);

- The cut or crushed portion of the third or fold lines extends beyond the edge devoid of flaps of the first blank, for example a distance of 0.5 mm to 2 mm;

the lower edge of the second cutout being opposite, or substantially facing the second folding lines, the cut-out portion or portions; crushed extend upwards over a length slightly greater than the height of the flaps of the first cut. By a little higher it is necessary to hear of the order of 1 to 2 mm more, to be beyond the edge of the cut of this distance; the first cut has eight flaps, namely four main flaps separated from each other by intermediate flaps adapted to form cut corners of the box. In this case, there are seven folding lines between flaps, and not three as in a four-sided package. The number of third fold line, substantially aligned with the first fold lines is then greater than two out of three, and for example at least five out of seven;

- The second cut comprises a series of flaps connected to the panels by fourth fold lines perpendicular to the third fold lines; the second cutout comprises a fastening tongue connected to the adjacent panel by a third fold line and extending along only a part of the corresponding adjacent panel, with respect to a portion of, or offset from the tongue of attachment of the first cut; the second cutout comprises a fastening tongue connected to the adjacent panel by a third fold line and located on the opposite side to that of the fastening tongue of the flap sequence of the first blank, outside said first blank; the second cutout comprises a fixing tongue connected to the adjacent panel by a third fold line, located on the same side and opposite the fastening tongue of the flap sequence of the first cut, and of greater width;

the first blank is located or arranged to be located outside the second blank when the box is formed;

the first cutout is located or arranged to be located inside the second cutout when the box is formed. The invention also proposes a box obtained with the set of blanks as described above.

Such a box is rigid, not foldable except by destroying it.

It also makes it possible to obtain a box of packing with polygonal section, formed from two cuts of material in sheet of cardboard, of which at least one in corrugated cardboard, namely a first cut comprising a continuation of at least four shutters main terminated by a fastening tab, interconnected by first folding lines parallel to each other, said sequence of flaps forming the walls of the base of the box and being connected on one side to a series of flaps by second fold lines perpendicular to said first fold lines, said flap sequence forming the bottom of said box, being devoid of flaps on the other side and a second cut comprising at least four panels interconnected by third parallel fold lines between them, said second cutout forming the cap of said box, the panels of the second cutout being respectively superimposed on the part den flap flap of the first blank, characterized in that two non-adjacent flaps of the first blank are fixed by gluing and respectively to two panels opposite the second blank, preventing their relative movement during folding or forming the box by winding said blanks around the blank. a volume of determined dimensions, and in that at least two out of three of the third fold lines of the second cut are substantially aligned with respect to the first fold lines of the first cut, one or more of said third fold lines comprising in part low a cut or crushed portion opposite the corresponding first fold line.

Advantageously, the cutting of the cut portions is in the form of a stick or a T-shape.

In another advantageous embodiment, the cut-off portion or portions are offset from the remainder of the corresponding third folding line, for example by a value substantially less than 1/3 El + 2/3 E2 (the thickness of the cardboard box). the base being E2 and that of the carton of the cap being El) for example of the order of 0.4 to 0.8 mm. Also advantageously, the portions of the third folding line are crushed, the crushing being for example carried out on an upper width 2 x (E1 + E2), and advantageously on the order of 10 mm. In an advantageous embodiment, the cut or crushed portion of the third or fold lines extends beyond the edge devoid of flaps of the first blank. The invention also proposes a method for producing a polygonal section packaging box of the type described above, and / or from a cutting assembly as described above. The invention also proposes a method for producing a polygonal section packaging box from two corrugated cardboard material blanks, namely a first blank comprising a sequence of at least four main parts terminated by a fastening tongue, interconnected by first folding lines parallel to each other, said series of flaps forming the outer walls of the base of the box and being connected on one side to a series of flaps by second lines of folding perpendicular to said first fold lines, said series of flaps forming the bottom of said box, and a second cut comprising at least four panels interconnected by third fold lines, parallel to each other, said second cut forming a cap for said box, characterized in that at least two out of three of the third fold lines of the second blank are substantially spaced the same distances as those spacing the first fold lines of the first cut, is cut and / or crushes one or more of said third fold lines at the bottom on a portion arranged to be placed opposite one of or corresponding first fold lines, two flaps or two non-adjacent panels are glued, the second cut is placed on the first cut, the portion or portions of the cut or creased third and / or third fold lines of the second cut are substantially aligned with respect to the first fold lines of the first cut, and then applied the second cut on the first cut or vice versa, for gluing the two panels and the two non-adjacent flaps, and forming the box by winding cuts around a determined volume, without sliding of the second cut relative to the first cut , cutting or crushing performed on the portions of third fold lines allowing the formation without creases, crushing or tearing of the shutters and panels of the box.

Advantageously, the cut and / or crushed portion of the third fold line is made so that it extends after gluing beyond the flangeless edge of the first blank. _^

In an advantageous embodiment, the portions of third fold lines in the shape of a butt or in the form of a T are cut out. Advantageously, the cut portion or portions are offset from the remainder of the third corresponding fold line, for example towards the glued panel. flap facing.

In an advantageous embodiment, the offset is of the order of 0.4 to 0.8 mm.

Advantageously also, one crushes the portion or portions of third fold lines in opposite first folding lines for example on the order of 10 mm.

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

It refers to the accompanying drawings in which:

Figure 1 shows in top view and in perspective, a set of cutouts not according to the invention, with shifting of the fold lines, to allow sliding.

FIG. 2 shows in plan view and in perspective, a set of cuts without offset of the fold lines, for folding or wrapping around a non-slip mandrel according to the present invention.

FIGS. 3A and 3B are planar views of cutouts according to the invention showing the two types of bonding possible when wrapping around a mandrel, namely bonding on both sides of the mandrel (FIG. 3A), and gluing on the top and bottom of the mandrel (Figure 3B).

Figures 4 and 5 show in perspective the formation steps around a mandrel of a box according to one embodiment of the invention.

Figure 6 shows, in section, the box of Figure 5 and the stresses which are exerted during the coating.

Figures 7 and 8 respectively show a perspective view of an embodiment of a set of blanks according to the invention, and examples of cut portions. Figures 9 and 10 show two embodiments of cut-shaped sticks according to the invention.

Figure 11 is a top view, in perspective, of another embodiment of a set of blanks according to the invention, with crushing.

Figure 12 is a sectional view of a 90 ° fold of a corrugated cardboard blank. FIGS. 13 and 14 show, in section, two superimposed cuts, respectively before folding and after folding, on one side at a portion of a third fold line cut or crushed, when the fold lines are substantially opposite, without sliding, according to the invention, and on the other side when the sliding is allowed.

Figure 1 shows a set 1 of cutouts for eight-sided box, with a conventional gluing, that is to say on one side, before coating around a mandrel allowing relative sliding between cuts.

More precisely, the set of blanks 1 comprises two corrugated cardboard blanks, namely a first blank 2 comprising a first series of four rectangular main shutters 3, 4, 5, 6 separated by intermediate rectangular shutters 7 of smaller width, and terminated by a fastening tab 8. The flaps and the tongue are interconnected by first fold lines 9 parallel to each other.

The flap suite is furthermore provided with one side of a series of flaps 10, respectively connected to the main flaps by second rows of flaps. ^

folding 11, perpendicular to the first fold lines.

The flaps of the first cut are of a first height h said small height for example 5 cm.

They are devoid of flaps on the other side and fit to form the walls of the base of the box.

A second cut 12 comprising a second series of at least four rectangular main panels 13, 14, 15, 16, separated by intermediate rectangular panels 17, are interconnected and with a tongue 18, by third fold lines 19, parallel to each other, and suitable for forming the cap of the box. The panels of the second blank are respectively superimposed on the corresponding flaps of the blank portion of the first flap sequence of the first blank.

In this sliding embodiment according to the prior art, the axis 20 of the coating mandrel, the face of which is applied to the single glued pair, formed of the panel 14 and the flap 4 (strokes of FIG. glue 21).

It can be seen that to enable the coating, the first fold lines 9 and the third fold lines 19 must be more and more staggered, as and when the coating is made, to allow the cutting games to be trimmed. external to the internal cut. This causes a final shift Δ important at the last flap 6, which can correspond to several thicknesses of cardboard, that is to say several millimeters, for example from 4 to 8 mm. FIG. 2 shows a set 22 of cutouts this time according to one embodiment of the invention.

Subsequently, the same reference numbers have been used to designate identical or similar elements, possibly by giving them an index.

The assembly 22 comprises in a similar way to the assembly 1, two blanks of cardboard material, at least one of which is made of corrugated cardboard.

More specifically it comprises a first cut 2 'comprising a first sequence of at least four main flaps 3', 4 ', 5' and 6 ', separated by intermediate flaps 7', and terminated by a fastening tab 8 ', the flaps and the tongue being interconnected by first fold lines 9 ', parallel to each other.

The suite has one side of a flap suite

10 'connected to the first sequence of flaps by second fold lines 11' perpendicular to the first fold lines, and is devoid of flaps on the other side.

This first sequence of shutters is adapted to form the walls of the base of the box that will be manufactured with this set.

A second cut 12 ', comprising a second sequence of at least four main panels 13', 14 ',

15 ', 16', separated by intermediate panels

17 ', and provided with an end tab 18', is provided to form the cap of the box.

The panels and the tongue are interconnected by third fold lines 19 'parallel to each other, the panels of the second blank 12' being superimposed on the flap-free portion of the flaps of the first blank 2 '.

According to the invention, two non-adjacent flaps, here the flaps 3 'and 5', are fixed by gluing respectively to the panels 13 'and 15' facing each other, via two lines 21 'of glue, (by example of the adhesive known under the name "hot melt").

At least two out of three of the third fold lines 19 'and in this case five out of seven on this eight-sided package, namely the third fold lines situated between the successive panels 13', 17 ', 14', 17 ', 15', 17 'of the second cut, are substantially aligned with respect to the corresponding first fold lines 9' of the first cut.

The fold lines 19 'of this second cut will be detailed later. It should already be noted that at least two out of three of these third fold lines 19 'have in the lower part (zone 23) cut or crushed portions opposite the corresponding first fold lines.

When the coating is going to be carried out, the two panels and shutters above being glued, the offset Δ 'at the level of the last coated flap, which depends on the cardboard used, becomes very small (less than or equal to 1/2 thickness of cardboard for example less than 1.5 mm) for cartons 3 mm thick.

FIGS. 3A and 3B show two embodiments of set of blanks according to the invention, one 24 with a gluing on the two panels 25, 27 which will be plated on the lateral faces of the mandrel M (Figure 3A) and the other 29 representing a bond which will be made on the faces 26, 28 located on and under the mandrel (Figure 3B). The first cutouts 30 and 31 of these two sets may have different shapes depending on the type of base that is to be obtained at the linear.

In Figure 3A the first cutout comprises a portion 32 of smaller height, to present a front face better clearing the products during their presentation.

Figure 3B shows a first more conventional cut, with rectangular flaps 33. Finally the second cutouts here, in a manner known per se, a second series 34 of substantially rectangular flaps, intended to form the top of the cap.

Their other side is, as on all sets of blanks according to the invention, devoid of flap on the side of the first blank. The gluing is carried out at 35 on the rectangular flaps 25 and 27 for FIG. 3A, and at 36 on the rectangular flaps 26 and 28 for FIG. 3B, the last flap (free to fold back without constraint). then being, in one case (Figure 3A) the top flap of the mandrel, and in the other case (Figure 3B), a side flap.

Advantageously, orifices 37 are provided to assist the separation of the tray bases, in a manner known per se during the placing of the products in the shelf. FIGS. 4 and 5 show steps 38, 39, 40 and 41 for manufacturing a box from a set of second blanks 42 and 43 according to the invention. The three third fold lines 44, 45 and 46 are spaced substantially the same distances as those spacing the first fold lines 47, 48, 49 of the first blank.

Then cutting and / or crushing the three third fold lines at the bottom (at 50) on the portions arranged to be placed opposite the first corresponding fold lines.

Then are glued (lines of glue 52 and 53) two opposing non-adjacent flaps 54 and 55. The second cut is then placed on the first cut, the third cut or creased cut lines of the second cutout 43 being substantially aligned with respect to first folding lines of the first cut. It follows a superposition areas 50 cut or crushed third folding lines 44, 45, 46 with the first folding lines 47, 48, 49 over their entire ^'height, and in one embodiment at a height a little upper, so that said zones protrude above the edge 56 without flap of the first blank 42.

The second blank is then applied to the first cut (step 39) to join together the two panels and the two non-adjacent flaps so that any translational movement in the direction of the plane of the blanks is made impossible without destruction. to say without tearing and / or delamination of one of the two boxes. This set of blanks is then positioned under a mandrel 57, here under an unsized face 58, and the set of blanks is folded down (FIG. 5) by wrapping it around the determined volume of the mandrel, without sliding of the second blank. relative to the first cut, except at the last panels 61 and flap 62, one side remained free.

Cutting or crushing performed on the portions of the third fold lines according to the invention, then allow the formation without fold crushing or tearing shutters and panels of the box.

It can be seen in FIG. 6 that, during the coating, high stresses and shear stresses (arrows 59) will be exerted at the level of the glue lines 60.

On the other hand, there is no tension and therefore a natural sliding of the last panels 61 and corresponding flap 62 situated above the mandrel, in the embodiment described and not glued to each other.

It can be seen that the normal consequences if the means described in the invention were not implemented, would be either a rupture of the glue lines, or a tearing in the corners, or an appearance of folds on the inner belt.

Thanks to the modifications of the lower portions of the third fold lines, (cutting and / or crushing) it is obtained a chewing of the cardboard during the coating and / or a catch of the games at the fold itself, over a corresponding distance the length of the cutting line and / or chewing, distance which is greater than or equal to the height of the base opposite.

FIG. 7 shows in perspective a set 63 of blanks, namely a first cutout 64 comprising four rectangular flaps 65, 66, 67, 68 interconnected by first fold lines 69, and connected to a succession of flaps 70, by second flaps 71. The flaps have a height h between their flangeless edge 72 and said second fold lines 71.

The assembly comprises a second cut 73 of four rectangular panels 75, 76, 77, 78 interconnected by third fold lines 79, respectively comprising a lower portion 80, 81, 82 of height h + e_ with e _^ = 1 or 2 mm cut in butt.

More specifically, the three lower portions 80, 81 and 82 of the three third fold lines 79 are cut by a simple vertical cross-section in the form of a stick or inverted L, with a slight offset d of the order of 1 mm, to the panel 75 for the portion 80, the panel 76 for the portion 81 and the panel 78 for the portion 82.

The vertical cut line starts from the bottom of the second cut 73, inside, formed by the cap, and extends upwards and as we have seen, over a slightly greater distance, for example from 1 to 2 mm to the height h of the external cut.

FIG. 8 shows three examples of vertical sections 83, 84 and 85, namely a cup 83, in the form of a stick facing outwardly from the center of the blank, a cup 84 in the shape of a stick. turned inward, and a T-shaped cut 85.

The butts or branch of the T are for example 1 to 2 mm in length. The main branch 86 of the lower portion may be shifted relative to the third fold line 87, or located (branch 88) in its extension (Figure 10).

The cutting mode chosen, the width of the butts or bars of the T, are functions of the packaging and the cardboard, the best positioning to be found by experimenting so as to the scope of the skilled person, depending in particular the thickness of the blanks and the grammage of the papers used.

FIG. 11 shows another embodiment of a set 90 of blanks according to the invention, of the type described with reference to FIG. 7. The lower portions 91 of the third folding lines are chewed or squashed therein on a width b for example of the order of 1 cm, and exceed above the upper edge of the outer belt of a value i. for example equal to 5 mm. Such crushing is performed in a manner known per se, and is located astride the first fold line 69 opposite.

It can also be shifted left or right as described with reference to the sections of FIGS. 9 and 10.

FIG. 12 shows a fold 92 of corrugated cardboard illustrating, for a person skilled in the art, the neutral fiber 93, which is two-thirds of a thickness E of the inner wall.

In order to ensure a correct coating of two superposed blanks, the person skilled in the art will then be led a priori to shift the fold lines of the outer blank, with respect to the corresponding fold lines of the inner blank, as a function of the thickness of the blank. this last.

In fact, it must successively shift each fold line of the outer blank one-third of the thickness of the inner blank, to which it adds two-thirds of the thickness of the outer blank, the dimensions accumulating as and when the coating takes place. According to the invention, it is therefore different as illustrated on the left-hand part of FIGS.

14, in section.

Here, the inner blank 94 is locked relative to the outer blank 95 because of the sticking point 96. More precisely and as described in the embodiment of the invention more particularly described, the first external cutout 95, made of sheet material corrugated cardboard, has adjacent flaps 97 and 98 interconnected by first fold lines 99 defined by their grooving (bottom line of the fold line).

The second internal cut-out 94 comprises, in turn, panels 100, 101 interconnected by third fold lines 102 whose lower portion is as defined above, for example here with a cut 103.

Flat (FIG. 13) the panels 100, 101 of the second cutout are respectively superimposed on the part without flap flaps 97, 98 of the first blank, the panel 101 being fixed to the flap 98 by gluing (point 96).

As another non-adjacent flap (not shown) is also glued on the other side of flap 97, this prevents relative movement when folding or forming the can by winding cuts around mandrel 104.

Line 99 is substantially aligned with line 102. A slight shift of about six paper thicknesses between grooves 99 and 102 therefore exists.

It is shown, for the record, on the right side of Figures 13 and 14, the conventional shift with sliding observed otherwise during a free coating.

The width of the offset is then of the order of 1/3 x El + 2/3 x E2, with El and E2 giving the respective thicknesses of the second and first cut. In this case, if El = 3mm and E2 = 1.5 mm there is an offset of the order of 2 mm.

With the invention the offset becomes 0.5 to 7 mm.

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

On the contrary, it encompasses all the variants and in particular those in which the lower portions of the third fold lines are crushed and cut at the same time and / or all the lower portions are chewed and / or cut.

Claims

1. Set (22, 24, 29, 63, 90) of blanks for the constitution of a packaging box, comprising two cuttings made of cardboard sheet material, at least one of corrugated cardboard, namely a first blank ( 2 '; 30, 31; 64) having a first sequence of at least four main flaps (3', 4 ', 5', 6 '; 65, 66, 67, 68) terminated by a fastening tab (8' ), interconnected by first folding lines (9 '; 47, 48, 49; 69) parallel to each other and provided on one side with a succession of flaps (10', 70) connected to said first sequence of flaps by second fold lines

(11 ^# _/ 71) perpendicular to said first fold lines and devoid of flap on the other side, said first sequence of flaps being adapted to form the walls of the base of the box and a second cut (12 ', 73 ) comprising a second sequence of at least four panels (13 ', 14', 15 ', 16'; 75, 76, 77, 78) interconnected by third fold lines (19 '; 44, 45, 46); 79) parallel to each other, said second cut being adapted to form the cap of said box, the panels of the second cutout respectively being superimposed on the flap-free portion of the flaps of the first blank, characterized in that two non-adjacent flaps (3 ', 5', 25, 27, 28) of the first cut are fixed by gluing and respectively to two facing panels (13 ', 15', 33) of the second cut, preventing their relative movement during the folding or training of the box by winding said blanks around a volume of determined dimensions, and in that at least two out of three of the third fold lines (19 ') of the second blank are substantially aligned with respect to the first fold lines of the first cut, one or more of said third lines having in the lower part (23) a portion (80, 81, 82; 91) cut or crushed vis-a-vis the corresponding first fold line.

2. Set of blanks according to claim 1, characterized in that the two blanks are made of cardboard

^* corrugated.

3. An assembly according to any preceding claim, characterized in that the portion or portions (80, 81, 82) of third fold lines substantially aligned with the first fold lines and located opposite said first lines of folding are cut out.

4. The assembly of claim 3, characterized in that the cutout is in the form of a butt.

5. The assembly of claim 3, characterized in that the cutout is T-shaped.

6. An assembly according to any one of the preceding claims, characterized in that the cut portion or portions (80, 81, 82; 91) are offset from the remainder of the third corresponding fold line.

7. Set of blanks according to any one of the preceding claims, characterized in that, the thickness of the carton of the base being El and that of the carton of the cap being E2, the base being fixed to the outside of the cap, the portion is cut _{? η}

and its offset is substantially less than 1/3 El + 2/3 E2.

8. An assembly according to any one of claims 1 and 2, characterized in that the portion or portions (91) of third fold lines substantially aligned with the first fold lines and located opposite said first fold lines are crushed.

9. Set of blanks according to claim 8, characterized in that, the thickness of the carton of the base being El and that of the cardboard of the cap being E2, the crushing is performed on a greater width 2 x (E1 + E2).

10. Assembly according to any one of the preceding claims, characterized in that the portion (80, 81, 82; 91) cut or crushed of the third or fold lines extends beyond the edge devoid of flaps of the first cut.

11. An assembly according to any one of the preceding claims, characterized in that the lower edge of the second cutout is opposite, or substantially opposite the second fold lines, the portion or portions (80, 81, 82; 91) cut or crushed extend upwardly over a length slightly greater than the height of the flaps of the first blank.

12. Set of blanks according to any one of the preceding claims, characterized in that the first blank has eight flaps, namely four main flaps separated from each other by intermediate flaps (T) adapted to form cut corners of the box.

13. Packing box with polygonal section, formed from two cuts of cardboard sheet material, at least one of corrugated cardboard, namely a first cut comprising a sequence of at least four main shutters terminated by a tongue fasteners, interconnected by first folding lines parallel to each other, said series of flaps forming the walls of the base of the box and being connected on one side to a series of flaps by second fold lines perpendicular to the said first folding lines, said series of flaps forming the bottom of said box, and a second cut comprising at least four panels interconnected by a third fold line, said second cut forming the cap of said box, the panels of the second cutout being superimposed respectively on the flap-free portion of the flaps of the first blank, characterized in that two non-adjacent flaps of the first cut are fixed by gluing and respectively to two panels facing the second cut, preventing their relative movement during folding or forming the box by winding said cutouts around a volume of determined dimensions, and in that at least two out of three of the third fold lines of the second blank are substantially aligned with respect to the first fold lines of the first blank, one or more of said third fold lines having in the lower part a cut-out portion or crushed with respect to the corresponding first folding line.

14. Packaging box according to claim 13, characterized in that the portion or portions of third fold lines substantially aligned with the first fold lines and located opposite the first fold lines are cut.

15. Box according to any one of claims 13 and 14, characterized in that the cutting of the cut portions is in the form of butt or T-shaped.

16. Box according to any one of claims 13 to 15, characterized in that the cut portion or portions are offset from the rest of the corresponding third fold line.

17. Box according to claim 16, characterized in that the offset is of the order of 0.4 to 0.8 mm.

18. Box according to claim 13, characterized in that the portion or portions of third fold lines facing the first fold lines are crushed.

19. Box according to claim 18 characterized in that the thickness of the cardboard of the base being El and that of the carton of the cap being E2, the crushing is performed on a greater width 2 x (E1 + E2).

20. Box according to any one of claims 13 to 19, characterized in that the cut or crushed portion of the third or fold lines extends beyond the edge devoid of flaps of the first blank.

21. Box according to any one of claims 13 to 20, characterized in that the first cutout has eight flaps, namely four main flaps separated from each other by intermediate flaps adapted to form cut corners of the box.

22. A method for producing a polygonal section packaging box from two corrugated cardboard material blanks, namely a first cut comprising a sequence of at least four main components terminated by a fastening tab. interconnected by first folding lines parallel to each other, said series of flaps forming the walls of the base of the box and being connected on one side to a series of flaps by second fold lines perpendicular to said first fold lines, said series of flaps forming the bottom of said box, and being devoid of flap on the other side, and a second cut comprising at least four panels interconnected by third fold lines parallel to each other, said second cutting forming a cap for said box, characterized in that at least two out of three of the third fold lines of the second cutout being sen spaced apart by the same distances as those spacing the first folding lines of the first blank, cutting and / or crushing one or more of said third fold lines at the bottom on a portion arranged to be placed opposite the one or more corresponding first fold lines, two flaps or two non-adjacent panels are glued, the second blank is placed on the first blank, the portion or portions of the cut or creased third line or fold lines of the second blank are substantially aligned with the first lines; of folding of the first blank, the second cut is then applied to the first cut or vice versa, to glue the two panels and the two non-adjacent flaps, and the box is formed by winding the blanks around a determined volume, without slipping of the second cut with respect to the first cut, the cuts or crushing performed on the portions of third fold lines allowing the formation without creases, crushing or tearing of the shutters and panels of the box.

23. The method of claim 22, characterized in that one carries out the cut and / or crushed portion of the third or fold lines so that it extends after bonding beyond the edge devoid of flaps of the first cut.

24. Method according to any one of claims 22 and 23, characterized in that one carries out a cutting portions of third fold lines in the form of butt or T-shaped.

25. Method according to one of claims 22 to 24, characterized in that the portion or portions of third fold lines opposite the first fold lines are cut away from the remainder of the third corresponding fold line of the order of 0.4 to 0.8 mm.

26. A method according to any one of claims 22 to 25, characterized in that the portion or portions of third fold lines facing the first fold lines are crushed.

27. The method of claim 26, characterized in that one crushes or portions of third fold lines facing the first fold lines on the order of 10 mm.