DE2900625A1 - METHOD OF MANUFACTURING A CARTON PACK AND CARTON PACK PRODUCED THEREFORE - Google Patents

Description

PATENTAN .VAL '. E.

HELMUT SCHROETER KLAUS LEHMANN

^DIPL - ^PHYS -

NOLEX CORPORATION kn-no-12

L / Bi.
5th January 1979

Method of making a carton pack and thereafter
manufactured carton pack

They are one-piece, T-shaped blanks for the production of
Cardboard packs for holding liquids, such as beverages, are known. The T-shape of such blanks results
hence that at opposite ends of one of the side walls
of the blank for the carton pack end walls are provided. Each of the remaining side walls is provided at its ends with locking tabs which are bent inwardly after the blank has been folded into the shape of an open-ended tube, whereupon a side gusset is made by means of a side locking tab carried by the same side wall with which also connects the two end walls. The free edges of the end walls are designed to match the locking tabs at the ends of the side walls
can be sealed and used to form carton packs
with flat ends, the side edges of the end walls or
at least the side edges of the end wall to be closed last and the closure flaps on the side walls, which this
End adjacent are heated to the polyethylene or a
other material used to seal the carton pack
in a semi-molten state. After this heating, the upper end wall is on the top of the previously
Formed Kartonfeitenwftnde pressed on to the carton pack

909850/0535

D-7070 SCHWÄilSCH GMOND Ci COMMON ACCOUNTS D-aOOO MÖNCHEN TO

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to close and seal with the liquid contained therein.

The prior art has also already recognized the possibility that there are significant advantages in ultrasonic energy to be used as a means of heating and sealing carton packs. Unfortunately, this requires heating by means of ultrasound that the pair of pack edges to be sealed together between an ultrasound transducer and an anvil is clamped and pressurized, the two parts to be sealed together during the Application of the ultrasonic energy must be pressed against each other.

Sealing by means of ultrasound is done by vibration of an ultrasound transmitter in relation to a stationary anvil, which must be heavy enough to remain stationary despite the vibrations of the ultrasound transmitter directed against it. The edge edges of the cardboard pack made of paper or cardboard, which are inserted between the ultrasonic transducer and the anvil, are heated in the areas in which they are acted upon by the vibrations between the transducer and the anvil and are practically hammered. The heating of these edges depends on the pressure that is achieved by the rapid hammering of the ultrasonic generator against the cardboard pack lying on the anvil. Venn the anvil is too light in weight, the anvil is vibrated with the ultrasonic transducer, and ee occurs only a very small relative movement between the transducer and the anvil. This means that very little heat is generated in the carton pack. In addition, the anvil has an uninterrupted support for the marginal edges below the ultrasonic transducer offer "daait one unbroken seal can be ereielt. In those areas in which the support of the edge provided by the anvil is interrupted, there is no

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heating in the marginal edges, and therefore does not result in them No sealing areas. Another condition for achieving an unbroken seal is that that the carton pack is not interrupted even in the areas in which a seal is to be achieved. on in this way, slits or cracks in the marginal edges interrupt the heat build-up during the pounding of these edges between the ultrasonic transducer and the anvil.

If the side walls of a carton pack previously filled with liquid are to be sealed to the top end wall, it is impossible to place an anvil inside the container. Therefore, so far no funds have been available to to enable such a carton pack to be sealed with the aid of ultrasonic energy.

S is assumed that it is known dan upper end of a ¹ carton after filling with liquid in the manner to form a gable roof, which makes it possible to seal a single gable seam by means of ultrasound, while the seam is clamped between an ultrasonic transducer and an anvil the working surfaces of these parts lying in a plane which is perpendicular to a plane which defines the flat top end of the carton pack. Although such gable-top carton packs work satisfactorily, they do not allow the packs to be stacked in a larger container, as is desirable when the carton packs, e.g. for beverages, are relatively small, e.g. milk packs with a content of 1/2 or 1 / 3 1. In addition, the formation of the gable roof on these cardboard packs requires a substantial increase in the amount of cardboard material, as is required for a liquid container, since the entire gable roof is typically empty and not filled with liquid and simply made of additional, folded cardboard material to form the Gable roof consists.

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The cardboard blank j which forms the subject of the invention, and also the method used to manufacture a carton pack from the carton blank are specially designed to the use of an ultrasonic seal between the marginal edges of the top end wall of the carton pack and the upper ones To enable or facilitate edges of the pack side walls, after the carton pack is filled with a liquid or a drink.

The carton pack has the new feature of a continuous, uninterrupted sealing edge or sealing flap, which extends around the circumference of the carton pack and which even in the area of the corners between adjacent side walls is not interrupted. The invention also creates an anvil that is heavy enough to provide the necessary static support for the carton pack during heating by ultrasound, while at the same time a narrow lip is formed on the anvil, which the closure flap of the carton pack continuously along the adjacent one another Supports side walls of the carton pack, the carton pack may already be filled with liquid. the Sealing lip on the anvil is yielding or yielding under the ultrasonic vibrations of the ultrasonic transducer prevented by its protruding little from the body of the anvil. The protrusion of the lip on your anvil is therefore under formed at an angle of about 4 5, since this shape is the Introduction or generation of vibrations in or in the lip of the ultrasound transducer is limited to a minimum. For this reason, the lip of the anvil only pushes the locking tab below the top of the side wall around one short distance inwards. In order to avoid tearing or breaking the closure flap of the carton pack in the area of the corners between

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To prevent adjacent side walls of the carton pack, the lip on the anvil is formed with a radius or a gradual rounded transition in the corresponding corners formed on the anvil. The closure flap is folded so that it forms a wall part with twice the wall thickness, which also helps to prevent tearing in the feasibility of the corner fri. The small size of the indentation of the locking flap, which is caused by the lip on the anvil, further serves to reduce the stress on the locking flap in the feasibility of the corners and thereby prevent tearing.

The invention thus provides one with the help of ultrasound hall energy Sealed liquid container with a flat or flat top, which allows the T-f containers to be stacked on top of one another Transport facilitated. This is achieved in that the closure lashers are made in one piece at the end of adjacent soite walls trains with each other instead of, for example, never from each other separated by a V-shaped incision, such as it happened in the prior art. Rather, the closure tabs according to the invention are connected to one another by corner webs. These versenlußlascheri therefore run continuously at three Sides of the k-irton pack around when dirc; e r, u ^ i mem ul'ferieridigen Tube shaped int. The locking lashers are inside bent to result in a Wnridt '.- il double MtT' thickness at the top Perimeter of the sidewall toi Ie: ', u form.

Make the 1 ' ¹ ul len of the carton pack with F Lür.ni fl'-e i. The upper part of the wall was formed with a double Waridotärkr, du. dur-jh d it; · Closure lashers and the side walls, and the [Fmfangurärider of the upper end wall with each other. Thiest; I · ¹ smiles lieg- ri i: t ei nor Ebfne, which is at an angle of about ¹ IS both iti tk-train on the

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ORIQ / NAL fNSPECTED

ORJGiNAL

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Level of the top end wall as well as to the level of it too sealing side wall is inclined. This compression stretches the webs that connect the intermediate flaps together. In order to ensure that this stretching does not break open the webs that form the closure larjes at the corners of the carton pack connect with each other, the carton pack is sealed at a point immediately below the seal the sealing tool pressed inwards so that the outermost, through the locking tabs and the connecting tabs The position reached by the webs is not sufficient to cause tearing. Double the wall thickness at the sealed corner also contributes to a tear or break at this Place to prevent.

After the mold was used to the adjacent sealing edges in dev bechriebenen We ice form, an ultrasonic transmitter or ultrasonic horn is placed against the circumferential edge, wherein the Beruhrungoende of the ultrasonic transducer also defines a plane that is at an angle of about 45 with respect to the side wall and is inclined with respect to the end wall of the carton pack. The application of ultrasonic energy to the peripheral edge then seals the top end wall to the side walls.

After filling and sealing as described introductory the carton pack forms a polygonal structure with a flat, flat top that can be stacked on top of each other during transport is suitable.

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BATH

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An embodiment of the invention is described below with reference to the drawing.

Fig. 1 is a top plan view of a carton blank showing is used to make the carton pack;

FIG. 2 is a perspective view of the carton pack in part, starting from the carton blank according to FIG Fig. 1, completed form before closing, i.e. before joining the upper end wall to the Sidewalls;

Fig. 3 is a perspective schematic view of the partially manufactured carton pack of Fig. 2; which are taken in a schematically shown anvil is additionally used to press the peripheral edges of the carton pack against the anvil Stamp is shown;

Figure 4 is a perspective view of the apparatus cardboard pack produced according to FIG. 3 after the peripheral edges have been closed or sealed;

Fig. 5 is an enlarged fragmentary section taken on line 5-5 in Fig. 4 and shows the formation of the closure of the carton pack between the end wall and the side walls at the connection of two such side walls;

6 is an enlarged section taken along line 6-6 in Fig. 3 and shows the relationship of the partially manufactured carton pack of Fig. 2 to the anvil and the Stamp when the top of the carton pack is singulated;

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Pig. 7 is a section similar to that of FIGS. 6 and shows the punch in the fully lowered position on the anvil;

Fig. 8 is a section similar to that of Figs. 6 and and shows the ultrasonic funnel replacing the punch above the anvil to perform the final sealing step.

Fig. 1 shows a cardboard blank 11 made of polyethylene-coated cardboard in a T-shape, from which a complete cardboard pack to be sealed in a liquid-tight manner can be produced without the need for other cardboard parts. The blank 11 consists of four side walls 13, 15 _} 17 and 19, which are set off or drawn from one another by notch or scratch lines 21. The blank 11 can be folded into a cardboard pack along these score or score lines 21.

The side wall 13 carries a lower pack end wall formed integrally therewith and drawn in advance by a score line 23 25, which is square in the embodiment described, because the four side walls 13, 15> 17 and 19 are shown with the same width. If two of the side walls have different widths compared to the other two side walls, and alternately within the four side walls, the resulting carton pack would have a rectangular cross-section rather than a square one Cross-section, and the end wall 25 would then be correspondingly rectangular and not be square. If there were only three side walls in place of the four, the end wall 25 would be natural triangular.

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From the opposite end of the sidewall 13 away an upper end wall or closure wall 27 extends without a score or scribe line is provided between the wall parts 13 and 27th The upper end wall 27 is wider than the lower end wall or bottom wall 25 or the side wall 13, and in addition the upper end wall 27 extends further away from the side wall 13 than the lower end wall 25. The length and the width of the end wall 27 are therefore greater than the width of each of the side walls 13, 15, 17 and 19. This larger area of the upper end wall 27 is required to overlap sealing the end wall 27 with the side walls 15, 17 and 19, as will be clear from the following description.

The side walls 15, 17 and 19 each have closure tabs or flaps 29 at their lower ends, which are indicated by score lines 31 and which are separated from one another by a pair of score lines 33, 35. The upper end of each of the side walls 15, 17 and 19 is also provided with a closure flap or flap 37, 39, ^ 1, which are indicated by notch or scratch lines ^ 3, ^ 5 and '4J .

If the cardboard blank 11 were designed according to the prior art, the closure flaps 37, 39, 41 would be from one another separated. In the present case, however, they are connected to one another by webs 53 and 55 made from the material of the cardboard blank. The ridges 53 and 55 are defined by Rdtz or score lines 57 and 59 drawn. It has been found that this notch or score lines 57 and 59, the webs 53 and form, advantageously all the way to the notch or scratch lines Ό, ^ 5, ^ 7 extend, but just before these notch or Scoring lines can end so that the apex of the triangular webs 53 and 55 a small distance from the notch or Have scoring lines M3, ^ 5, M7.

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Along its free edge, the side wall 19 is provided with a closure flap 49, which is marked by a score line or a score line 51 is mapped out.

Finally, for a carton pack, which is especially used for Intake of liquid determined and with a drinking or pouring opening and possibly with one arranged inside Drinking straw, as shown, for example, in U.S. Patent 3,259,297, one of the side walls, for example the side wall 13, be provided with a rectangular opening 53a, which is parallel to and near one end of this side wall to the longitudinal direction of this side wall 13 extends. This opening 53a is produced by cutting through the side wall 13 or almost cut through such that either a tab is formed which is attached at one end, or that a complete opening delimited all around by a cutting line can be formed. In both cases it can the wall part arranged within the opening has a drinking straw 101 (Fig. 4), which is arranged so that it can be pivoted around one end of the opening 53a so that it can be used for the insert can be pulled out of the cardboard packaging.

While in earlier designs the ends of the locking tabs 37j 39 »41 were often cut away at an angle, they remain here, as stated above, the locking tabs 37, 39, 41 of the Cardboard blank 11 connected to one another by the V-shaped webs 53 and 55. Each of the score or score lines 57, 59 runs at an angle of about 45 ° with respect to the adjacent score or score lines 21 ,. 43, 45 and 47. The notch or Scoring lines 57 and 59 preferably intersect the score or score lines 21 at the score or score lines 43, 45, 47, to facilitate a right-angled bending between the side walls 15, 17 and 19.

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The carton pack is shown in a partially completed state in Fig. 3, a series of process steps having been carried out to bring the carton pack to this level of completion. The first step is to bend or bend the several side walls at their score or score lines 21 in order to bring them into the shape of an open-ended hose, the closure flap hS on the side wall 19 ^- on the inside of the side wall 13 and the edge of the side wall 13 overlaps. It is envisaged that the cardboard blank 11 will be made of paper or cardboard material which is coated with polyethylene to make it impervious to liquids. The open-ended tube is produced from the cardboard blank 11 by inserting a mandrel into the open-ended tube and against the closure flap 49, ultrasonic energy being applied to the outer surface of the side wall 13 where it overlaps the closure flap 49. The ultrasound energy partially melts the polyethylene on the two abutting surfaces while keeping those surfaces in contact with one another under pressure until the polyethylene on both surfaces fuses and hardens to create a seal between the two surfaces.

After the formation of this open-ended tube, the lower end wall or bottom wall 25 can be sealed with the closure tabs 29 to complete the bottom of the tubing. This is done in the essentially achieved in that first the flaps 29 are folded over against the inside of the open-ended tube, which is formed by the side walls 13, 15, 17 and 19, the score or score lines 33 and 35 during this folding process form overlapping corner sections. The lower end wall

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25 is then folded against the bottom of the open ended tube and in particular comes into an overlapping position with the closure tabs 29. A mandrel is then against the Inside or outside of the hose and against the overlapping portions of the lower end wall 25 and the locking tabs 29 set, and on the opposite side an ultrasonic funnel is placed against the same, overlapping one Parts attached. Ultrasonic energy is then applied to the polyethylene on the abutting sections to seal together. From the above description it can be seen that both in the formation of the hose as well as the formation of the bottom seal, because there is no liquid inside the tube, and because a part the hose remains open for access, it is possible to insert a spike or anvil inside the hose, so that a juxtaposition between the mandrel and an ultrasonic funnel can be achieved, with each other too sealing parts are pinched or compressed between these opposed working members. object however, above all of the invention is to provide a means for ultrasonic sealing of the upper open End of the tubular pack shown in Fig. 2 to a point in time when this pack is already filled with liquid, so that a mandrel or an ultrasonic funnel cannot can be inserted into the interior of the carton pack.

This sealing or closing of the upper end wall 27 is shown in FIG. In order to close the carton pack Contribute, can advantageously the upper end wall 27 before reaching the position shown in FIGS. 2 and 3 first folded to a fully closed position and released so as to articulate the top end wall or to make it pliable or pliable. Loaded with polyethylene

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laminated paperboard tends to have a "memory" so that when the bending pressure is removed, the upper end wall 27 tends to to reset itself to a part of the distance towards the starting position, which is parallel in a plane to the level of the side wall 13 is located. The representation of the end wall 27 in FIGS. 2 and 3 is representative of the position of the End wall 27 after plumbing and before pressing down and sealing. In addition, the end wall 27 is preformed so that that their edge parts on all three, not hinged to the side wall 13 edges are at an angle of approximately Extend 45 ° upwards or outwards. Also the locking tabs 37, 39 and 4l can be made pliable before the final closure, and these closure flaps can after be bent inside towards the center of the open-ended hose and bent beyond this position so that they lie flat against the upper inner portion of end walls 15, 17 and 19. When released from this position, reverse the locking tabs 37, 39 and 4l, as shown, to part of their pivoting path against the upper end of the Carton pack, but they do not return to a position where they are level with the end of the carton pack would lie. Rather, they remain folded in below the upper edge of the side walls 15, 17 and 19.

Referring to Fig. 1, it should be noted that in order to fold over the upper end wall 27 and the locking tab 37 extending from the side wall 15 extends in different directions, it is necessary to separate these parts 27 and 37 from each other as shown by section line 60. As can be seen from the following description, extends see the cutting line 60 only over part of the way from the free edge of the locking tab 37 to the notch

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or score line 43, but cut line 60 does not intersect the score line 43, so that a narrow connection or a narrow web of the original, uncut material between the closure tab 37 and the end wall 27 remains.

As shown in Fig. 3, the carton pack filled with liquid inserted in its partially completed state according to FIG. 2 in a three-sided anvil 61, the so is designed to mate with the outer surfaces of the carton pack and externally with the side walls 15,17 and 19 is applied. Accordingly, the anvil 61 has a rear frame part 63 which has a lower U-shaped section 65 and an upper U-shaped portion 67 connects to each other. As already stated, the carton pack 11 is at Insertion into the anvil 61 already filled with liquid, and the upper end wall 27 is partially closed. A top one Stamp 69 with lower edges leading to the upper edges of the anvil 61 is lowered onto the anvil 61, as shown by arrow 71, around the top end wall 27 against the side walls 13, 15, 17 and 19 of the carton pack. This locking process is best understood with reference to FIG.

As Fig. 6 shows, the side wall 17 (and each of the other side walls in a similar manner) is in abutment against the upper one U-shaped section 67 of the anvil 61 brought. The at the score or score line 45 between the side wall 17 and the The bend formed by the closure tab 39 is arranged above a beveled edge 73 of the anvil 61. The upper The punch 69 has a lower beveled edge 75 which mates with the upper beveled edge 73 of the amboase 61. When the punch 69 is lowered and against the upper section

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67 of the anvil 61 is pressed, the lower edge 75 of the punch 69 presses both the surrounding edge of the upper end wall 27 as well as the closure flap 39 as well as the upper peripheral part the side wall 17 in contact with one another. This relationship is shown in Fig. 7 with the punch 69 complete is lowered onto the section 67 of the anvil 61 and presses against this section 67 and the three layers of material 27j 39j 17 squeezes the sealing surface on the upper circumference the carton pack.

After the punch 69 has been lowered into the squeezed position according to FIG. 7, it is removed and an ultrasonic funnel 77 (FIG. 8) with a beveled lower edge 79 " which corresponds to the beveled lower edge 75 of the punch 69 is used in place of the The punch 69 is lowered onto the upper section 67 of the anvil 61. Ultrasonic energy is applied to the three layers of material 27, 39, 17 through the funnel 77 in order to heat these three layers and to fuse the polyethylene coating thereon to one another to form a sealed corner edge.

The three layers of material sealed together at the corner edge lie essentially in a plane 81 (FIG. 8). This plane is at an angle of about 45 ° with respect to the upper end wall 27 as well as inclined with respect to the side wall 17.

While Fig. 3 shows the punch 69 as if it were looking perpendicular down on the anvil 67 would move like it shown by arrow 71, the fact that the The punch 69 only touches the anvil 6l on three sides, making it necessary that the force exerted by the punch 69

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also has a horizontal component directed from right to left in FIG. 7, since no pressure is exerted by the punch 69 on the hinge edge of the upper pack end wall 27 located on the right in FIG. In practice it has been found that the resultant force to be exerted on the punch 69 or by the punch 69 in FIG. 7 should be directed diagonally downward and to the left. Preferably, the punch can move back and forth in an oblique direction downwards and to the left as shown in FIG. The remaining two closure flaps 37 and kl on the side walls 15 and 19 of the carton pack are sealed in a manner which is essentially identical to the sealing process illustrated in FIGS. 6 to 8 for the closure flap 39 and the side wall I7, so that seal three sides of the carton pack in this way. By using a bend of the parts sealed to one another at an angle of ^ 5 °, the squeezing of the parts to be sealed together between the anvil 61 and the ultrasonic funnel 77 on all three side edges to be sealed together is facilitated.

The sealing at the corners of the carton pack will now be described with reference to FIG. Looking at FIG. K it can be seen that the sealed part of the side walls 15, 17, 19 of the carton pack extends outwardly beyond the plane of the side walls 15, 17 and 19. This results in a problem of stretching the material at the webs 53 and and stretching the material in the area of the score lines k3, ^ 5 and 47 (FIG. 1) in the area of the webs 53 and 55, since the circumferential dimensions are increased . This stretching causes the material to break or tear at the corners

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can. This risk is reduced by a corner bead 83 (FIG. 5), which extends from the edge of the anvil 61 at the lower end the beveled edge 73 protrudes. This protruding corner bead 83 is in the same way at each of the two corners of the anvil 61 attached and creates an indentation 85 in the corner of the cardboard pack directly at the two corners 87 and 89 (FIG. 4) below the sealed edge. As Fig. 5 shows, the indentation 85 reduces the dimension 91 to a negligible one The size or even zero by which the sealed edge 93 of the carton pack extends over the. Side wall 15 at a predetermined Must extend length 95 of the sealed edge 93 also. The corner bead 83, which is a relatively in the circumferential direction Has a large radius, creates a bend with a correspondingly large radius at each of the packing corners 87 and 89, as a result of which the use of ultrasonic energy for sealing is greatly facilitated.

The dimension 91 that the sealed edge 93 extends beyond the side wall 15 also determines the amount that the corners 87 and 89 (Fig. 4) of the carton pack are stretched during the sealing process. As shown in Fig. 4, the upper end wall 27 of the carton pack 11 is depressed or compressed during the sealing process, while the side walls 15, 17 and 19 are stretched at the sealed corners 87 and 89, respectively. If this stretching is sufficiently great, this will break the corners at the seal on the webs 53 and 55 and cause a leak in the package. The indentation 85 enables a wide sealing edge 93 with a large radius at its corners, whereby the dimension 91 of the protruding part is limited or completely eliminated .

As best shown in FIG. 2, the corner 97j which is formed between the side walls 13 and 15 must also be connected to the upper end

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wall 27, and this seal is most difficult to make at the cutting line 6O, which is in the Pack blank between the closure flap 37 and the end wall 27 is formed. By making this cutting line 6O short can end before the score or score line 43 (Fig. 1), at which the closure tab 37 is bent, it is possible to have a to leave short web of material between the end wall 27 and the closure flap 37, which is against the interior of the The carton pack extends and against which the end wall 27 can be sealed to prevent any leakage at that corner 97 impede.

As shown in Fig. 4, the sealed edge 93 allows on three sides of the upper circumference of the carton pack 11 at an angle of 45 ° with respect to the plane of the upper end wall 27 nesting the bottom or lower end wall 25 of a carton package 11 within the perimeter of the top a lower carton pack 90 if, for example, the carton packs 11 and 90 are stacked on top of one another in a larger one Containers are to be transported.

In describing the invention, it is assumed that the carton pack prior to insertion into the anvil 61 with a Liquid 99 is filled and that a drinking straw 101 is attached and sealed within an opening 53a, as shown in FIG. shows, so that the carton pack 11 is closed and filled from the outset with the exception of the upper end wall 27.

While the above embodiment with the use of a punch 69 to form the seal of the carton pack was described before the use of an ultrasonic funnel, the ultrasonic funnel can alternatively be used 77 perform both functions in a single work step,

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in particular when the ultrasonic funnel 77 is arranged for oblique movement as described above.

The features described above are now specifically related in the following to the requirements for the sealing of carton packs made of cardboard by means of ultrasound. As FIG. 5 shows, the lip 73 of the anvil 61 shown in cross section extends outward at an angle of approximately 45 and not straight outward. Referring to FIG. 3, the lip or chamfered edge 73 of the anvil 6l continuous and not interrupted in the region where it is supported, the closure flaps of the carton, the portions having locking tabs 37 are not broken 3 39 and 4l. 3 and k clearly show that the uninterrupted beveled edge 73 of the anvil 61 extends from the body of the anvil 61 a very short distance so that a very small indentation 85 is formed on the locking tabs as a result of the pressing of the beveled edge 73 against the side walls of the carton pack as shown in Fig. 5. If, on the other hand, the beveled edge 73 shown in Fig. 5 extended from the body of the anvil 61 at a right angle and a substantial distance away, such an edge would be more susceptible to vibration with the ultrasonic horn 77 rather than remaining static so that very little internal heat would be transferred to the closure tab located between the ultrasonic horn 77 and the anvil 61. Also, the larger indentation 85 caused by such a rim 73 would tend to cause a tear in the corner of the closure tab. Therefore, the beveled edge 73 shown in Fig. 5 is formed so that it is only a short distance at an angle of

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extends about 45 °. In order to avoid the formation of a crack between adjacent locking tabs 37, 39 and 41, the anvil 61 is formed with a rounded, gradual transition on the beveled edge 73 in the vicinity of the corners between adjacent locking tabs, as in connection with the projection 83 in FIG. 5 has been described. Instead of tearing open the closure tabs in the vicinity of the corner webs 53 and 55, the closure tabs are therefore stretched by the beveled edge 73 in the region of the projection 83. The invention thus provides a continuous closure flap which is supported on an anvil by a small lip which is pressed into the side wall of the pack, this lip having a specific design that minimizes vibrations in the lip and prevents the pack from tearing open between excludes neighboring locking tabs. Since the lip extends diagonally or transversely from the body of the anvil and is inclined obliquely, the closure flaps are sealed in a plane inclined to the upper end wall of the package, this inclined plane corresponding to the bevel under which the surface of the sealing lip or the Sealing protrusion is formed on the anvil. FIGS. 6 and ¹ J clearly show the sequence of operations by which the sealing edge of the packing from a straight shape shown in FIG. 6, starting bent into a chamfered shape as shown in FIG. 7, which corresponds to the bevel, under which the surface the lip or inclined edge 73 extends.

The invention has three features which prevent the continuous closure flaps of the carton pack from being broken. These features are implemented in the area of the pack where the stress is greatest, namely on the outer corners 87 and 89 of Figures 4 and 5 · The first feature

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consists in double folding the peripheral edges to form two layers as shown in FIG. In this way the stress is highest along the folded portion 93 of FIG. 5 and not along an outer edge of the closure flap. This reduces the likelihood of tearing in the vicinity of corners 87 'and 89 because the stress occurs in an area which is within the edges of the closure tabs. The edges of the closure flaps are more susceptible to being torn open. In this way, the double fold eliminates any dependence on the strength of the closure flaps in the vicinity of their edges. A second feature which contributes to the continuity of the closure tabs is shown in Figure 5 in which the length or dimension 91 of the protrusion of the corner 89 of the closure tab from the side wall 15 is minimized by the sealing lip or beveled edge 73 of the anvil 61 is designed in a suitable manner. This minimizes or eliminates the stretching and stress that arise in the area of corner 89. The stress generated in the area of the corner 89 is proportional to the distance 91> by which the corner 89 of the closure tabs kl, 39 and 37 extends beyond the adjacent side wall 15, as FIG. 5 shows. In this way, reducing the length or dimension 91 reduces the stress and thus helps prevent the closure tabs from tearing open. The third feature, which helps to prevent tearing between the closure tabs 37, 39 and kl in the area of the corners 87 and 89, is the large transition radius provided on the sealing lip or the projection of the inclined surface 73 in the area of the corners 87 and 89 is. These transition radii reduce the stress in the area of the corners of the indentations 85 in the closure flaps of the carton pack,

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by gradually folding or not sharp-edged splitting of the closure flaps to form the corners 87 and 89 enable.

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Claims (33)

P ATE NTAN WAi-T Ξ HELMUT SCHROETER KLAUS LEHMANN DIPL.-PHYS. ■ DIPL.-INC. NOLEX CORPORATION kn-no-12 L / Bi. 5th January 1979 Method of making a cardboard pack and thereafter manufactured carton pack PATENT CLAIMS Method of closing the top of a carton pack, previously used as a tube with a polygonal cross-section and made with a closed bottom and filled with liquid, wherein the Kartoripaekung several substantially has planar side walls, one of which extends upwardly above the others, around an upper end wall with this upper end wall being folded over into a position with respect to the one associated side wall, in which the top end wall is substantially perpendicular to each of the side walls, characterized in that the peripheral edges of the top end wall (27) and the top edges of some of the side walls (13, 15, 17, 19) between an ultrasound source (7T) and an anvil (61) are compressed, and that ultrasonic energy is introduced into the peripheral edges and the top edges to to seal these edges together. 2. The method according to claim 1, characterized in that that the anvil (61) has a narrow lip (73) and that the peripheral edges of the upper end wall (27) and the 909850/053 5 D-7070 SCHWABISCH CMÜND COMMON ACCOUNTS: D-8000 MUNICH TO TeU-lon: (07171) 56 90 Oeutsthc Bank AG Punschcdiknnt »Telephone .: (089) 725 20 71 HS (HHOEItR telegrams: SArwjut Miintiien 70/37 369 ΜιιικΚη K. LEHMANN telegrams: Schroepat liu.JisS.mt49 Telex: 7248 Ö68 pJ ^ el d (BLZ .'i0 7OC I Ol lo79 4l-HiH 1 ip <.wik> itraiSi IC Tihx: 52 12 248 p.nvi, J - 2 - kn-no-12 Upper edges of the side walls (15, 17, 19) between the Ultrasonic source (77) and this lip (73) are pressed together. 3. The method according to claim 2, characterized in that that the upper edges of the side walls (15, 17, 19) are pressed in to form a peripheral edge with the side walls to form the joint between the ultrasonic source (77) and the lip (73), with the peripheral edges of the upper end wall (27) is compressed. 4. The method according to claim 3 *, characterized in that that the pressing takes place in that the carton pack is pressed against the lip (73). 5. The method according to any one of the preceding claims, characterized in that the compression of the Peripheral edges of the upper end wall (27) and the upper edges some of the side walls (15, 17, 19) between an ultrasound source (77) and a narrow lip (73) of an anvil (61) takes place in a plane which is inclined to the Side walls and is inclined to the upper end wall. 6. The method according to claim 2, characterized in that that the lip (73) extends over the length of an uninterrupted peripheral edge through the upper edges the side walls (15, 17, 19) is formed. 7. The method according to claim 3, characterized in that the pressing is an uninterrupted, continuous Forms the peripheral edge of the side walls (15, 17, 19) between the ultrasound source (77) and the lip (73) of the anvil (61) is compressed. 909850/0535 - 3 - kη-no-12 8. The method according to claim 5, characterized in that that the lip (73) is arranged on the anvil (61) in a plane which is about Ί5 obliquely to the Side walls (15, 17, 19) and to the top end wall (27) lies. 9. The method according to claim 1, characterized in that that initially the ends of the plurality of flat side walls (15, 17, 19) to be folded over on the side panels to make a two-layer To form edge portions of the side walls adjacent to the top end wall. 10. The method according to claim 9, characterized in: c h n e t that by initially folding the upper ends of the flat side walls (15, 17, 19) towards the interior of the carton pack be knocked down. 11. The method according to claim 1, characterized in that that by compressing the upper edges of some of the side walls (15, 17, 19) stretched in one direction so that they have a larger dimension in that direction than they were before they were compressed. 12. The method according to any one of the preceding claims, characterized in that after folding over and prior to compression, the peripheral edges of the upper end wall (27) and the upper edges of the side walls (15, 17, 19) between a mandrel or punch (69) and the anvil (61) are squeezed together to form a preliminary crease. 13. The method according to claim 3, characterized in that that the pressing takes place in that the upper edges of the side walls (15, 17, 19) are immediately adjacent to the upper end wall (27) are depressed inward. 909850/0535 kn-no-12 14. The method according to claim 13, characterized in that that the pressing in presses the flat side walls (15 »17, 19) inward by less than 2.5 mm. 15. The method according to claim 7, characterized in that that by pressing the corners of the upper edges of adjacent side walls (15, 17, 19) along a radius or pressed in along a rounding in order to reduce stresses and to tear open the continuous Avoid circumferential edge. 16. The method according to claim I _x, characterized in that the compression of the circumferential edges of the upper ends of adjacent side walls (15, 17, 19) takes place along a radius or along a curvature in order to reduce stresses and to avoid tearing of the continuous peripheral edge . 17. The method according to claim 9, characterized in that the pressing and folding reduce the distance by which the folded corner edge of the two-layer wall area extends beyond the planes of the side walls (15i 17 * 19) in order to reduce stress and tear to avoid the continuous peripheral edge. 18. The method according to claim 1, characterized in that that the anvil (61) has a heavy body having a top surface and a bottom surface, that a plurality of adjacent perpendicular surfaces are provided substantially perpendicular to the top surface is that a plurality of corners is formed between adjacent surfaces, that a continuous narrow one 909850/0535 -b- kn-no-12 Lip protrudes obliquely from the multitude of surfaces and look substantially in a direction parallel to that upper surface and closely adjacent to the upper surface, and that on the lip (73) at each of the corners one Rounding is formed. 19- The method according to claim 18, characterized in that that the plurality of mutually adjacent perpendicular surfaces has three surfaces, one on three sides imaginary rectangle or square. 20. The method according to claim 19, characterized in that that the narrow lip (73) projects less than about 2.5 mm from the perpendicular surfaces. 21. The method according to claim 20, characterized in that the narrow lip (73) has a triangular cross section with two sides of the triangle protruding from the side faces at an angle of about 45 degrees. 22. Cardboard pack, produced and / or closed by the method according to any one of claims 1 ±> is 21, characterized in that the upper edges of the side walls (15, 17, 19) form closure flaps (37, 39, ¹ Jl) which are connected to one another over at least half of their width and which are sealed to the peripheral edges of the upper end wall (27) to form a seal between the locking tabs and the peripheral carriages of the upper end wall. 23. Carton pack according to claim 22, characterized in that the flat side walls - (13, 15, 17, 19 ") form a polygonal cross-section and intersect to form you pack corners, the corners (87, 909850/0535 - 6 - kn-no-12 89) indentations (85) immediately adjacent to the seal with the upper end wall (27), these indentations (85) removing stresses and reduce the amount by which the seal is laterally extends beyond the respective corner. 24. Carton pack according to claim 22, characterized in that it is characterized that the seal lies in a plane which is substantially at 45 ° from the plane the upper end wall (2?) is inclined, 25. Cardboard pack according to claim 23, characterized in that g e k e η η, that the radius of the rounding of the corners the carton pack is smaller than the radius of the seal adjacent to the corners of the carton pack. 26. Carton pack according to claim 22, characterized in that g e k e η η - ζ e i c h η e t that the several sealing glasses (37, 39j 4i) each flat against the associated neighboring one Side wall (15, 17, 19) are folded over. 27. Carton pack according to claim 26, characterized in that geke η η. that the seal consists of three layers which contain the closure glass sheets (37, 39, 41) _t part of the side walls (15, 17, 19) and the peripheral edges of the upper end wall (27), which are all sealed together. 28. Carton pack according to claim 22 »characterized by g; e k e η η ζ e I c h η e t that the Verscnlüßlasohen (37, 39, ^ D flat against corresponding "adjacent side walls (15, 19) are rearranged in order to form a circumferential fold that is attached to -The finished carton pack has a larger overall dimension $ € 9850/053 - 7 - kn-no-12 has than the entire Bn -Ho dor corresponding neighboring Side walls. 29. Carton pack according to claim 22, characterized in that the seal is designed so that it facilitates the stacking of a plurality of such carton packs, a kart pack resting with its bottom on the upper end wall of a lower pack. 30. Carton pack according to claim 22, characterized in that the seal is above the The plane of the upper end wall (27) extends to the lower end or bottom (25) of an identical carton pack above the first-mentioned cardboard pack. 31. Carton pack according to claim 22, characterized in that g e k e η n, that the side walls (13, 15, 37, 19), the locking tabs (37, 39, Ίί) and the upper end wall (27) are formed from a one-piece cardboard blank (11) and are fastened to one another in a direct abutting manner, the one-piece cardboard blank (11) being particularly suitable for a manufacturing method for manufacturing a carton pack is embodied by sealing using UIt "anchaJ! Energy is formed, the blank with is coated with a material that melts under the influence of the ultrasonic energy. 32. carton pack according to claim 22, characterized in that the width of the upper end wall (27) is larger than the width of the side wall (13, 15, 17 »19) · 909850/0535 ORIGINAL -U- kn-no-12 33. carton pack according to claim 22, characterized in that the length of the upper end wall (27) is larger than the width of the side walls (13, 15, 17, 19) 909850/0535