MXPA03011716A

MXPA03011716A - A carrier for cans, a cardboard blank for a carrier for cans and a method to assemble a cardboard blank.

Info

Publication number: MXPA03011716A
Application number: MXPA03011716A
Authority: MX
Inventors: Karlsson Kenneth
Original assignee: Smurfit Munksj Packaging Ab
Priority date: 2001-07-03
Filing date: 2002-07-03
Publication date: 2004-12-06
Also published as: RU2004102912A; BR0210807A; DK1401728T3; SE0102379L; EP1401727A1; JP4053000B2; WO2003004377A1; SE522020C2; HUP0400288A2; US20040211695A1; RU2007132083A; MXPA03011711A; BR0210812A; CY1105776T1; DE60212630T2; PL366632A1; PL200975B1; NO20040009L; PL366634A1; CA2452601A1

Abstract

The present invention relates to a carrier of cardboard, preferably corrugated cardboard, for connecting a plurality of generally cylindrical cans (4), being disposed in at least two rows and having an inclined upper part and a top closure (6) with a projecting circular rim (8). The carrier (31) is produced from a plane blank (32), having, for each can to be connected by the carrier, two mutually opposing, essentially arcuate slits (44, 45), the outer edges of which engage below the rim (8) of the cans when the carrier is assembled on the plurality of cans to connect the carrier and the cans and form a package assembly. Gripping recesses (42), adapted to be gripped by fingers to lift and handle the package assembly, are centrally disposed in the carrier blank (32) between the rows of cans (4), and a bowl-shaped indentation (66) is formed centrally in the carrier (31) between said gripping recesses (42) and the rows of cans (4). The invention also relates to a plane blank for a carrier of cardboard and a method to assemble a plane blank of cardboard.

Description

CARRIER OF CANS, PIECE IN TOSCO DE CARTÓN FOR THE CARTER OF CANS? ASSEMBLY METHOD OF THE SAME Field of the Invention The present invention relates to a cardboard carrier, preferably corrugated cardboard, which connects a plurality of generally cylindrical cans, which is located, at least, in two rows and has an inclined upper part and an upper closure with a protruding circular ring. The carrier is produced from a piece to be worked or a piece in flat rough, which has, for each can connected by the carrier, two recxprocessarily opposite grooves of an essentially arched shape, the outer edges of which clutch by below the ring of the cans when the carrier is assembled on the plurality of cans so as to connect the carrier and the cans and form a package assembly of cans. The invention also relates to a flat piece of cardboard for a can carrier and to a method of assembling a blank piece of cardboard.

Background of the Invention Cylindrical cans are employed in the beverage packaged beverage industry such as, for example, REF. 152743 mineral water, beer, and soft drinks or soft drinks. To carry a plurality of cans, package assemblies of cans are provided, which can comprise from two to ten cans. Up to now, there have been many different types of package assembly means provided so as to allow a plurality of cans to be lifted and handled, for example, by means of a consumer. The plastic materials are used as package mounting means, for example, in the form of a plastic film wrapper that extends around the packed cans or in the form of reciprocally connected plastic rings, which are applied around the cans. However, these package assembly means are expensive and cause environmental problems. Other types of can carriers, made of cardboard, have also been introduced, which have both environmental and commercial advantages. Also, the combinations of plastic and cardboard materials have been used as packaging means for cans. If one considers the extensive use of package assemblies for beverages and the large amount of cans sold in these packages or assemblies, the cost of the individual package, including the material, as well as assembly costs, is an important factor. the cost of assembling the packed package of cans sold. Therefore, relatively small changes in the costs of package assemblies are very important. In addition, it is important that the contents of the packages are clearly visible and can be identified in the package assembly. A type of cardboard carrier configured as a "Banderole" or the so-called wrapper that extends around the group of cans are frequently used and, for example, is described in document TJS-A-3, 194,476. This wrapping around the carrier is expensive and it is also complicated to apply around the cans in a continuously operating production line. A further disadvantage is that the contents of the package can not be easily identified by the consumer. Other types of cardboard carriers are known, which are adapted to be applied against the upper side of the group of containers and which are to be connected thereto. A carrier of this type is described, for example, in 'US-A-3, 094,210. The carrier is produced from a blank piece of cardboard having two opposing U-shaped slits for each container to be connected by the carrier. The flat piece is assembled in the group of containers, folding the lateral projections downwards in the direction of the sides of the container, so that the outer edges of the slots in the carrier clutch below the rim of the containers. However, in order to prevent the edges of the slits from disengaging from the rim, immediately following the reciprocal movements between the containers, a corresponding additional carrier must be applied on the bottom of the containers. The carrier described above is disadvantageous because it can only be used for a single row of containers and is expensive due to material costs and the more complicated assembly of a two-piece carrier. A further disadvantage is that the lateral projections of the carrier protruding downwards along the sides of the containers, can be more easily captured by an adjacent package assembly or by some other element, so that the projections are forced to move upwards and the edges of the slits are disengaged from the rim of the container. A similar carrier for cans is described in EP-B-0496807. The carrier comprises two opposing arched slits for each can and short incisions extending radially from the slits. A plurality of fins, formed between the incisions, clutch below the neck projecting from the cans. The fastening flaps are provided on each side of the carrier, which are adapted so that they can be folded when the carrier with the cans is held and lifted by the user. The carrier described has proven to be insufficient to securely seize the carrier in the cans, especially when lifting forces are applied to the recesses on the sides of the carrier. The carrier has a centrally placed crease line, which serves as a "hinge" when lifting forces are applied in the recesses on the opposite sides of the carrier, so that the cans are separated and tend to disengage from the carrier. In addition, the lateral fins are forced, by the lifting forces, to move in an upward direction, generating an additional risk increase for the disengagement of the can carrier.

OBJECT OF THE INVENTION The object of the present invention is to solve the aforementioned problems by providing a carrier, for a plurality of cans, which is located, at least, in two rows, which can be safely placed in the cans with the in order to connect, block and support the cans and to provide a package assembly that can be lifted and handled without risks of disengagement, and that is of an effective material and that can be easily and effectively applied and assembled in a plurality of cans. This objective is achieved according to the invention in a can carrier, a blank piece of cardboard and a method of assembling a blank piece of cardboard as described above and with the characteristic features defined in the appended claims. . According to the invention, clamping recesses are placed between the rows of cans and an indentation in the form of a bowl is formed in the holder between the clamping recesses and the rows of cans. The flat piece has a central portion that is intended to be accommodated between the rows of cans in the assembled state, this portion is slightly · wider than the current separation between the cans, so that indentations are formed between the rows of cans when the carrier is assembled on the cans. The assembled carrier according to the invention is reinforced by the bowl-shaped indentations placed centrally, so that the cans are firmly supported on the carrier. The lifting forces, applied in the clamping recesses between the rows of cans, are distributed in the direction of the clutch tabs in the inner grooves, so that the support pressure on and below the ring of the can is increased. .

During the formation of the bowl-shaped indentation in the center of the flat piece, the clutch tabs in the outer grooves supporting the ring of the can are forced to move in the direction of the center of the package assembly, increasing in this way the pressure of the clutch tongues in the outer grooves' on the ring of the can and tightening the connection of the carrier in the cans. By these means, a firm and secure connection of the cans in the carrier is achieved. According to a preferred embodiment of the invention, the opposing arched grooves for each can to be connected by the carrier are constituted by an arched intermediate section between two arched end sections. The intermediate section is formed in the radial direction within the arcuate end sections of the slit, so that a clutch tongue is formed in the middle section of the slit. The clutch tongue is adapted to slide through the protruding ring of the can when the side panels and the central portion of the blank are forced to move in the direction of the inclined sides of the can, and clutch under pressure underneath. of the can ring to block, safely and effectively, the carrier with the cans. The curvature of the clutch tongue continues completely through the curvature of the can and through the deformation of the end sections of the slits and the tension that originates in these sections, the clutch tabs are tightened and a secure connection is provided. and firm. The foregoing and additional objects and advantages of the invention will be more apparent in the following description of the embodiments of the invention and in the accompanying drawings.

DESCRIPTION OF THE FIGURES The invention will be described in greater detail below with reference to the accompanying figures, in which: Figure 1 shows a blank piece of cardboard for a can carrier according to an embodiment of the invention, carrier is adapted for two rows of cans with six cans, Figure 2 shows in a perspective view a package assembly comprising a carrier with six cans, the carrier is produced from the blank piece of cardboard of Figure 1, Figure 3 shows a sectional view of the assembly of the package of Figure 2 along the line III-III in Figure 2, Figure 4 shows a sectional view of the package assembly of Figure 2 along the line IV-IV in Figure 2, and Figure 5 shows a blank piece of cardboard for a can carrier according to a second embodiment of the invention, the carrier is adapted for two rows of cans with four cans.

Detailed Description of the Modes of the Invention The carrier according to the invention is produced from a flat piece of cardboard, preferably of corrugated cardboard. Preferably, a thin and compact corrugated board of F-shaped corrugations or corrugations is used. However, a thicker corrugated cardboard of E-shaped corrugations could also constitute a suitable material in the carrier. In order to minimize the effect of moisture on it. material, the corrugated cardboard can be coated with a plastic layer, preferably on its inner side. In addition to the plastic layer increases the resistance of the material against moisture, the layer also increases the ductility of the material. The advantages of environmentally friendly corrugated cardboard also remain with a plastic coating, because the plastic material in the coated layer can be recycled. Figure 1 shows the blank piece 32 for a carrier according to an embodiment of the invention. The carrier is adapted to connect and hold a plurality of cans 4 placed in two rows, as shown in Figure 2. The blank 32, in the embodiment shown is adapted for six cans 4, is shown in the state assembled in Figures 2-4. The cans 4, which do not form part of the present invention, are conventionally designed with an essentially circular-cylindrical basic shape. The upper part of the can is slightly inclined and is closed by an upper closure 6 which is sealed by means of a protruding circular ring 8. The flat blank 32 has an essentially rectangular basic shape, preferably with serrated corners or inclined 10, to reduce the risk that a protruding part of the carrier may be captured by an adjacent element, such as, for example, another package assembly of cans. At least two clamping recesses 42 are centrally placed in the blank between the rows of cans 4. In the embodiment shown, the clamping recesses 42 are formed as oval openings and provide a secure finger grip for two fingers. so that the can package assembly can be lifted and handled. However, the clamping recesses 42 may be circular or may be distinctly formed and may be provided with a foldable vane 43, as shown in Figure 1. The flaps capable of being folded 43 are adapted to be folded backward between the cans in order to provide a reinforced and friendly lifting edge to be held with the fingers in the holding recess 42. In Figure 2, the folding flaps 43 have been folded back under the carrier between the cans. Two reciprocally opposed and essentially arcuate slits 44, 45 are located in the blank 32 for each can 4 to be connected by the carrier 31. Preferably, each pair of slits comprises an outer slit 44, which has a first configuration , and an inner slit 45 adjacent a central line 34 between the rows of cans, which has a second configuration. The outer slit 44, in each pair of slits, consists of an arcuate intermediate section 16 having the arcuate end sections 18 on both sides thereof. The step-shaped portions 20 are located between the intermediate section 16 and the end sections 18. The arcuate end sections 18 are circular in part, the radius of which is equal to or slightly larger than the radius of the protruding ring 8. of the upper closure 6, so that the edge of the end sections 18 in the assembled state, is in line or protrudes slightly out of the edge of the flange 8, as shown in Figure 2. Therefore, the outer edge of the slit 44, along the end sections 18, can be easily moved downwards through the ring 8, as will be explained in more detail below. The arched intermediate section 16 of the slit 44 is formed in the radial direction inside the extended arcuate end sections 18 of the slit, so that the intermediate section forms an arched edge inside the arched line constituted by extensions of the two end sections 18. The arched edge of the intermediate section 16 with its step-shaped end portions 20, thus forms a clutch projecting tongue 22 directed towards the center of the piece in "coarse. mentioned earlier, the clutch tongue 22 is arcuate and may be circular in shape, the radius of which corresponds to the radius of the can just below the ring, the clutch tongue 22 may also be distinctly arched, for example , the arc can be circular and "wider." This clutch tongue 22 has a larger radius and a center that does not match the center of the cans in the state amble of the carrier. The clutch tongue is adapted to press-engage under the protruding ring 8 of the can 4 in order to connect and lock the can with the carrier, as will be described in more detail below. The inner slit 45 differs from the outer slit 44, mainly because the design of the intermediate section 46, but also because the arcuate end sections 48 are smaller than the corresponding end sections 18 in the outer slit 44. As a consequence, the intermediate section 46 of the inner groove is larger than the corresponding intermediate section 16 in the outer groove 44. The middle section 46 of the inner groove 45 has at least one incision, in the embodiment shown, has two incisions that they extend in radial direction 47. The incisions 47 extend between the edge of the slit 45 and an arcuate fold line 53, extending between the end sections 48 and demarcating a clutch tongue between the step-shaped portions 50. incisions 47 divide the clutch tongue into three clutch flaps 52. The curvature of the middle section 46 of the hendi hard 45 differs from the curvature of the arched fold line 53 because it is wider and has a radius larger than the fold line 53. As a consequence, the height of the clutch wings 52 varies, so that this is more high in the center of the clutch tongue and continuously decreases towards the ends of the clutch tongue, as shown in Figure 1. The arcuate fold line 53 is configured to correspond to the curvature of the contact line in the inclined surface of the can, as will be described in more detail below with reference to Figures 2-4. As shown in Figure 1, a plurality of additional fold lines is located in the blank 32. Three lines of longitudinal fold 54, for each row 'of cans, extend parallel to the long sides 56 of the piece in rough and the rows of cans. Two of the three longitudinal fold lines 54 connect together the ends of the arcuate slits 44, 45 or with an adjacent short side 53 of the blank and the third fold line 54 connects the step-shaped portions 20 together. in the outer grooves 44 or with an adjacent short side 58 of the blank. In addition, a plurality of fold lines 55 is located in the central portions of the blank, the fold lines in the embodiment shown are oblique and are located between the rows of cans in the blank. The oblique fold lines 55 connect the outer clutch flaps 52 with an adjacent clamping recess 42 or with an adjacent short side 58 of the blank. The portions 62, 64 of the flat blank are formed between the oblique fold lines 55, the arched fold lines 53 and the clamping recesses 42 or the side edges 58 of the blank. A width b, see Figure 1, of the portions 62, 64, extending between a pair of adjacent arched fold lines 53, is slightly larger than a spacing a, see Figure 3, which extends between the lines contact of the adjacent arched fold lines 53 on the inclined surfaces of the cans in the assembled state of the carrier, as will be described in more detail below. The flat piece 32, in the preferred embodiment is made of corrugated cardboard, is punched out from the corrugated material so that the direction of the corrugations of the corrugated material (marked with a double arrow 65 in Figure 1) coincides with the direction of the clutch tabs 22, 52. Through this orientation of the corrugations, the clutch tabs can withstand a maximum compression force. The outer dimensions of the flat blank 32, ie the length and width of the blank, are chosen so that the side edges of the assembled carrier, with their side panels 60 which are folded towards the inclined surfaces of the cans do not exceed the maximum external dimensions of the group of cans. As a consequence, the risk of inadvertent disengagement of the can carrier due to forces directed upwards on the side panels or other parts of the blank is considerably reduced. The plurality of cans 4, which is situated in two rows, is connected and held together by the carrier 31 in a can package assembly, as shown in Figures 2-4. During the formation of the carrier as shown in Figure 2 from the flat blank 32 of Figure 1, first, the flat blank is superimposed on the group of cans. The essentially circular portions of the blank located between the opposing grooves 44, 45 abut and cover the top closures 6, so that the grooves 44, 45 in the blank completely coincide with the protruding ring of the blank. can. Subsequently, the pressure is applied against the blank piece. First, pressure is applied against the side panels 60 on the outer sides of the can group, the panels being forced to move in a downward direction. Through the downwardly directed pressure, the blank 32 is folded into the fold lines 54. In this way, the side panels 60 are folded into two steps in the parallel fold lines 54 in the direction of the inclined surface on top of the cans 4, as shown in Figure 3. The arcuate end sections 18 of the outer grooves 44 are displaced in a downward direction through the eight ring of the can and the protruding clutch tongue 22 is slightly turned up. Therefore, the arcuate end sections of the slit 44 pass out of the protruding ring -8 and the clutch tongue 22 slides through and presses under the ring 8, in order to connect and lock the carrier in the slots. cans. The arcuate clutch tongue 22 is formed to position the cylindrical curvature of the can 4, so that the entire tongue 22 rests on the surface of the can below the ring 8 and exerts a clamping force that originates from of the voltages distributed in the carrier along the outer edges of the end sections 18 of the slits of the contact pressure of the carrier one on the top closure 6, so that a secure and stable connection is achieved between the carrier and the cans. As shown in Figure 2, the upper flat portions of the assembled carrier cover the upper portions of the cans 4, that is, the upper closures 6, so that these portions are protected from contamination during transportation and storage. In a subsequent assembly stage, preferably, a special pressure application tool with individually spring-loaded rollers, applies pressure to the center 34 of the blank, especially in the portions 62, 64. Preferably, the pressure is applied at certain points in the the blank, however, with a certain longitudinal extension, forcing the portions 62, 64 in a downward direction. Through the pressure, the blank is folded into the longitudinal lines of the inner fold 54, so that the outer edges of the inner slits 45 are displaced downwardly through the ring 8 of the can. In addition, the blank 32 'is folded into the oblique fold lines 55 and the arched fold lines 53. The downward pressure is applied, so that the arched fold lines 53 are forced against the inclined surfaces of the cans , and the clutch flaps 52 are folded up and under pressure clutch below the ring 8 of the can in a locked position. The downward pressure is applied in the central portions 62, 64 between the pairs of cans, thus forming the bowl-shaped indentations 66, 68 between the oblique fold lines 55 and the arched fold lines 53. Figure 4 shows that the lower level of each bowl-shaped indentation 66, 68 is centrally configured between each pair of cans and that the upper level of the bowl is configured at the edge of the holding recesses 42. The level of the bowl-shaped indentation 68 at the edge of the carrier 31 is slightly lower than the upper level at the edge of the holding recesses 42. The bowl-shaped indentations 66, 68 are obtained by means of an oversized width b in the central portions 62, 64 of the blank and the declination height of the clutch tongue towards its ends and also the oblique fold lines 55. In this assembly stage, that is, when the indentations are configured In the form of a bowl 66, 68, the spacing between the outer grooves 44 in the carrier is slightly reduced. As a result, the pressure of the clutch tabs 22 on the ring 8 are increased by means of the clamping forces coming from the central portions 62, 64. From this assembly step, the cans 4 are clamped and supported in the package assembly in a strong and secure clutch by the carrier. When the carrier 31 of Figure 2 is lifted, with its heavy load of cans 4 filled with liquid, by means of a two-finger grip on the holding recesses 42, the lifting force L is applied to the carrier between the rows of cans 4. Through the bowl-shaped indentations 66, 68 in the portions 62, 64 between the rows of cans 4, a rigidity of the central portions of the carrier is obtained. The rigidity of the central portions of the carrier prevents these portions from being forced to move upwards by lifting forces L directed upwards, so that the tongues would be disengaged from the cans. Unlike the carriers of the prior art, in which the lifting forces tend to disengage the carrier from the cans, the lifting forces L on the carrier according to the invention are partially transformed into the forces F which tend to pressing together the cans (see Figures 3 and 4) and partially the lifting forces L in the clamping recesses 42 are distributed in the direction of the oblique fold lines 55 and are transformed into a pressure increase of the fins of clutch 52 on ring 8, so that the cans are firmly held by the carrier and connected securely. By himself. The indentations in the form of a bowl, the recesses centrally provided between the rows of cans and the protruding tongues of the arched clutch in the carrier according to the invention, contribute to guarantee and effect a firm connection of the cans, a rigidity of the assembled carrier and a transformation of the lifting forces into an increase in clutch pressure, an increase in tightening of the carrier and a reduced tendency of movements of the cans in the Porter. Figure 5 shows a second example embodiment of a blank piece of cardboard for a carrier of four cans in two rows of cans. An opposing pair of slits 44, 45 in the blank for each can to be connected by the carrier and the fold lines, are placed in a corresponding manner as in the blank as shown in Figure 1. Two holding recesses 42 are located in the blank. A holding recess 42 is configured as an oval opening with a fold-able fin 43 and is located centrally in the blank between the rows of cans. The other holding recess 42 is located centrally at the edge of the blank and is configured as an open recess with a foldable flap 43. In a third embodiment of the invention (not shown in the drawings) the piece in rough is adapted for two cans located in two rows, like in the Figures 1 and 5. In this modality, there are two recesses of subjection, both of which are located in central position on the opposite edges of the piece in rough and are configured as open recesses, similar to the recesses 42 of Figure 5. According to the invention, blanks can be effectively assembled on the cans in an automated production line. However, blank pieces could also be effectively assembled in a semi-automatic line or in a packaging line and it is also convenient to manually assemble the blank in a package assembly. It will be understood that the invention is not restricted to the exemplary embodiments described above and that various conceivable modifications of the invention are possible within the scope of the following claims.

It is noted that in relation to this date the best method known by the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims

CLAIMS Having described the invention as above, the content of the following claims is claimed as property: 1. A cardboard carrier, preferably of corrugated cardboard, which connects a plurality of generally cylindrical cans, which is located at least in two. rows and having an inclined upper part and an upper closure with a circular ring projecting, the carrier is produced from a flat blank piece, which has, for each can to be connected by the carrier, two reciprocally opposed slits , essentially arched, the outer edges of which clutch below the ring of the cans when the carrier is assembled on the plurality of cans to connect the carrier and the cans and to form a package assembly, characterized in that: the recesses , adapted to be held by the fingers in order to lift and handle the assembly of packages, are located in the middle position In the rough part of the carrier between the rows of cans, and a bowl-shaped indentation is centrally configured in the carrier between the clamping recesses and the rows of cans. The carrier according to claim 1, characterized in that the bowl-shaped indentations are centrally configured in the carrier between a holding recess and a side of the blank in the carrier and between the rows of cans. 3. The carrier according to claim 2, characterized in that the arcuate slots comprise an arched intermediate section and two arcuate end sections on each side thereof, the intermediate section is formed in radial position within the extended end sections. arched 4. The carrier in accordance with the claim 3, characterized in that the intermediate section forms an arcuate clutch tongue projecting inwardly between the end sections, the tongue is adapted to abut and engage under the ring of the can in order to connect the carrier and the cans in the assembled state of the carrier- 5. The carrier in accordance with the claim 4, characterized in that the oblique fold lines are located in the blank of the carrier between the rows of cans, the oblique fold lines connect the outer portions of each clutch tab in the inner arched grooves with an adjacent retaining recess or with an adjacent side of the piece in rough. The carrier according to claim 5, characterized in that the arcuate end sections of the inner and outer grooves are circular, which have a radius that is equal to or slightly larger than the radius of the circular ring of the can and the inner arched slit in each pair of opposed slits has an arcuate intermediate section with a radius that is larger than the radius of the arcuate end sections. 7. The carrier in accordance with the claim 6, characterized in that the arched intermediate section of the inner groove forms a protruding clutch tongue which is radially delimited by an arcuate fold line extending between the end sections of the groove and which is divided by incisions extending in radial direction at least towards two of the clutch wings, the wings are adapted to be folded upwards so that they rest on the inclined surface of the can and clutch under the ring of the can, when the carrier is assembled in The cans. 8. The carrier in accordance with the claim 7, characterized in that the height of the clutch tongue of the inner groove reaches its maximum in the center of the tongue and decreases toward the ends thereof. The carrier according to claim 8, characterized in that the oblique fold lines extend between. each outermost clutch flap and an adjacent clamping recess or an adjacent side of the blank. 10. The carrier according to claim 9, characterized in that the fold lines are 'provided in the rough piece of the carrier extending in parallel with the sides of the blank and with the rows of cans, the fold lines connect the ends of the arched slots or with an adjacent side of the piece together. in rough. The carrier according to claim 10, characterized in that the additional fold lines are provided in the blank of the carrier extending in parallel with the sides of the blank and with the rows of cans, the additional lines The interleaved portions connect the step-like portions between the intermediate section and the end sections in the outer grooves, or with an adjacent side of the blank, forming the lateral outer panels capable of being folded along of the rows of cans. 12. A carrier according to any of the preceding claims, characterized in that at least two clamping recesses are provided between the rows of cans. The carrier according to claim 12, characterized in that the retaining recesses are formed as circular or oval openings in the blank of the carrier. 14. A blank piece of cardboard, preferably of corrugated cardboard, the piece in rough is 'adapted to be assembled as a carrier for a plurality of generally cylindrical cans which is located at least two rows, and has, for each can to be connected by the carrier, a pair of two reciprocally opposed, essentially arcuate slits , characterized in that the clamping recesses are located centrally in the blank part of the carrier between the rows of the pairs of grooves, the arched grooves comprise an arched intermediate section and two arched end sections on each side thereof, the intermediate section is radially configured inside the extended arched end sections. 15. The flat piece in accordance with claim 14, characterized in that the arched intermediate section of the inner groove of each pair of grooves forms a protruding clutch tongue, which is radially delimited by an arched crease line extending between the end sections of the slit and which is divided by the incisions extending radially in at least two of the clutch wings. 16. The flat piece in accordance with claim 15, characterized in that the oblique fold lines are located in the blank part of the carrier between the pairs of slits, the oblique fold lines connecting the outer portions of each clutch tongue in the slots. interior grooves with an adjacent recess or with an adjacent side of the blank. 17. The flat piece in accordance with claim 16, characterized in that the fold lines extending in parallel with the sides of the blank and with the rows of the pairs of slits are provided in the blank part of the blank. carrier, the fold lines connect together the ends of the arched slits or with an adjacent side of the blank. 18. The flat piece in accordance with claim 17, characterized in that the additional fold lines extending in parallel with the sides of the blank and with the rows of the pairs of slits are provided in the blank. of the carrier, the additional fold lines connect together the step-like portions between the intermediate section and the end sections in the outer slots in each pair or with an adjacent side of the blank. 19. A method of assembling a blank piece of cardboard, preferably of corrugated cardboard, according to a carrier on a plurality of generally cylindrical cans is located in at least two rows and has an inclined upper part and an upper closing with an outgoing circular ring, the blank piece 'comprises, for each can that is to be connected by the carrier, two. reciprocally opposed, essentially arcuate slits, the outer edges of which are intended to clutch below the ring of the cans when the carrier is assembled on the plurality of cans in order to connect the carrier-and the cans and form a package, characterized in that: the blank piece is superimposed on the plurality of cans; the pressure is applied against two opposite side panels on the blank, so that the panels are folded and the outer edges of the outer grooves are pushed down to engage under the ring of the cans, and the pressure is applied against the central portion of the blank in between the rows of cans, so that the outer edges of the inner grooves are displaced downward to engage below the ring of the cans and so that a central portion between the rows of cans is setting an indentation in the form of a bowl. 20. The method of compliance with the claim 19, characterized in that the pressure is applied against the central portion of the blank in between the rows of cans, so that the pressure is applied in certain central portions between each pair of cans by forming a bowl-shaped indentation between each pair of cans 21. The method according to the claim 20, characterized in that the pressure is applied against the central portion of the blank in between the rows of cans in certain central portions, so that the blank is folded into longitudinal fold lines extending between the ends of the slits interiors or an adjacent side of the blank and also in the oblique fold lines in the central portion of the blank. 22. The method of compliance with the claim 21, characterized in that the pressure is applied against the central portion of the blank in between the rows of cans, so that the pressure is applied in each central portion of the blank which is delimited by the oblique fold lines, the clamping recesses located centrally in the blank or a lateral edge of the blank, and the arched fold lines delimiting in the radial direction a clutch tongue formed in the inner groove. 23. The method according to the claim 22, characterized in that the pressure is applied against the central portion of the blank in between the rows of cans, so that the lines of arched fold are pressed against the inclined surface of the cans and the clutch tabs are folded upwards to end of clutch under the ring of the can. 24. The method of compliance with the claim 23, characterized in that the pressure that is used against the central portion between the rows of cans is applied by means of a pressure application tool with spring loaded rollers.