DE102017123011A1 - Packing jacket, packaging and method of making a package - Google Patents

Abstract

Shown and described is a packing jacket (10 ') made of a composite material for producing a packaging (15'), comprising: a lateral surface (17) with an inner partial region (17A) and with two outer partial regions (17B), a bottom sealing surface (19) for connecting the package jacket (10 ') to a bottom element (23), a gable sealing surface (20) for connecting the package jacket (10') to a gable element (24), a longitudinal seam (11) forming the two edges of the composite material into a circumferential package jacket (10 '), and two dummy fold lines (18) which extend through the lateral surface (17), wherein the bottom sealing surface (19) and the gable sealing surface (20) on opposite sides of the lateral surface (17) are arranged, and wherein the packing jacket ( 10 ') is folded exclusively along both apparent fold lines (18). In order to enable the production of packaging - in particular multi-part packaging - with complex geometry of inexpensive composite material, it is proposed that the packing jacket (10 ') in the region of the lateral surface (17) except the two dummy fold lines (18) has no further continuous fold lines. Also shown and described are a package (15 ') of such a packaging jacket (10') and a method for producing a package (15 ') from such a package jacket (10').

Description

The invention relates to a packing jacket made of a composite material for producing a packaging, comprising: a lateral surface with an inner partial region and with two outer partial regions, a bottom sealing surface for connecting the packaging jacket to a bottom element, a gable sealing surface for connecting the package jacket to a gable element, a longitudinal seam, connecting the two edges of the composite material to a circumferential packing jacket, and two dummy fold lines extending through the lateral surface, the bottom sealing surface and the gable sealing surface being disposed on opposite sides of the lateral surface, and wherein the packing jacket is folded exclusively along both dummy fold lines.

The invention also relates to a packaging, comprising: a packing jacket made of a composite material with at least one layer of paper or paperboard, with a bottom sealing surface and with a Giebelsiegelfläche, a bottom member which is connected to the bottom sealing surface, in particular welded, and a gable element with the Giebelsiegelfläche connected, in particular welded,

Finally, the invention relates to a method for producing a packaging, comprising the following steps: a) providing a packing jacket made of a composite material with at least one layer of paper or paperboard, with a bottom sealing surface and with a gable sealing surface, b) providing a bottom element and / or one C) providing a welding device, in particular a friction welding device, d) folding back the packing jacket along both apparent folding lines, e) connecting the bottom element to the bottom sealing surface and / or connecting the gable element to the gable sealing surface, the joining being effected by a welding process, in particular by a welding process Friction welding process takes place.

Packaging can be made in different ways and from a variety of materials. A widespread possibility of their production is to produce a blank from the packaging material, from which by folding and further steps first a packing jacket and finally a packaging is formed. This production method has the advantage, among other things, that the blanks and packing shells are very flat and can thus be stacked to save space. In this way, the blanks or packing coats can be made at a different location than the folding and filling of the packaging coats done. As a material composites are often used, for example, a composite of several thin layers of paper, cardboard, plastic or metal, especially aluminum. Such packaging is widely used, especially in the food industry.

A first manufacturing step is often to produce a circulating packing jacket from a blank by folding and welding or gluing a seam. The folding of the blank is usually along embossed fold lines. The position of the fold lines corresponds to the position of the edges of the packaging to be produced from the packing jacket. This has the advantage that the blank and the packing jacket are folded only in places that are already folded in the finished packaging. For the purposes of the present application, therefore, a blank is understood to mean a sheet cut from longitudinally and transversely in the longitudinal and transverse direction and defined in the circumference ("sheet-like composite"). A packing jacket is produced in a row from the sheet or laminar composite and ready for sale completed, with a packing jacket is considered to be salable completed, if necessary, after removal from an intended for the transport of place of manufacture to place of use readily for processing in one provided for filling machine is ready. This means, in particular, that the packing jacket no longer requires any mechanical intervention in order to ensure smooth processing of the packing jacket on the filling machine provided for this purpose. On the other hand, conditioning to the ambient climate and / or (additional) sterilization (eg edge sterilization method of the Applicant) can optionally also be carried out on a finished packing jacket during or after transport to the intended place of use. In contrast, intermediate steps during forming and sealing during the production of the package jacket from a blank can not yet be referred to as a package jacket. A method for producing a package from a packing jacket is for example from WO 2015/003852 A9 known (there in particular 1A to 1E) , The packaging described there has a rectangular cross-sectional area and is generally cuboid.

In addition to packaging with quadrangular cross-sectional areas and packaging with cross-sectional areas are known which have more than four corners. From the EP 0 936 150 B1 or the US 6,042,527 For example, packages with octagonal cross-sectional area are known. The shape of the packages is achieved by providing additional fold lines in the blanks.

However, a disadvantage of the folding of the described packing shells along the later packaging edges lies in the fact that only packages with angular cross-sectional areas can be produced. Alternative designs such as curves instead of the edges, however, are not possible.

One way to make packages with variable shape is to carry out the packaging in several parts. For this purpose, it is already known in particular to use the packing jacket only for the production of the lateral surface of the packaging and to produce the bottom and the gable from separate components which are connected to the lateral surface. This allows a more variable shape of the floors and gables compared to floors and gables that are folded from the packing jacket. In addition, for the floor and for the gable other materials can be used, as for the lateral surface.

Such a packing jacket and a packaging made therefrom are known from US 4,471,882 known. There, a packing jacket made of a multilayer composite material with a bottom element made of plastic and a gable element made of plastic is connected. The connection of the three parts is carried out by high-frequency welding, ie by welding with high-frequency electromagnetic waves. A disadvantage of this production method is that only certain materials are suitable for this process. For plastics, for example, only polar plastics, ie plastics with dipoles such as polyvinyl chloride (PVC) or polyamide (PA) come into question, while "neutral" plastics (without dipoles) such as polyethylene (PE), polypropylene (PP) and polystyrene (PS ) leave. Another disadvantage of the US 4,471,882 known packaging is that for the bottom element and the gable element compared to the laminate of the lateral surface thicker and more expensive injection molded parts made of plastics are used

Against this background, the invention has the object, the initially described and previously explained in more detail packing envelope and the above-described and previously explained packaging such that the production of packaging - especially multi-part packaging - is made possible with complex geometry of cost composite material.

This object is achieved with a packing jacket according to the preamble of patent claim 1, characterized in that the packing jacket has no further continuous fold lines in the area of the lateral surface except for the two dummy fold lines.

The packing jacket according to the invention consists of a composite material and serves to produce a packaging. In particular, the packing jacket may consist of a composite of several thin layers of paper, cardboard, plastic or metal, in particular aluminum. The composite material of the packing jacket preferably comprises a layer of paper or paperboard. The orientation of the fibers of this layer preferably runs along the central axis of the packing jacket (ie from the bottom area to the gable area). Preferably, the packing jacket is in one piece. The packing jacket comprises a lateral surface with an inner partial region and with two outer partial regions, a bottom sealing surface for connecting the packaging jacket to a bottom element and a gable sealing surface for connecting the package jacket to a gable element. The bottom sealing surface and the gable sealing surface are arranged on opposite sides of the lateral surface. Furthermore, the packing jacket comprises a longitudinal seam which connects two edges of the composite material to form a circumferential packing jacket. Through the longitudinal seam can be made from a flat - usually rectangular - blank a circumferentially closed, circumferential packing jacket. The longitudinal seam can be produced for example by gluing and / or welding. Because of the longitudinal seam, such packing shells are also referred to as longitudinal seam-sealed packing shells. The packing jacket also has two apparent fold lines which run through the lateral surface. The dummy folds should - as well as conventional fold lines - facilitate the folding of the packing jacket. Fake fold lines can be generated by material weaknesses. Since the packaging should be liquid-tight, as material weakenings no perforations, but so-called "creases" are used. Creases are linear material displacements, which are impressed into the composite material with pusher tools. The packing sheath is folded along both sham fold lines.

According to the invention, it is provided that the packing jacket has no further continuous fold lines in the area of the lateral surface except for the two dummy fold lines. In other words, the packing jacket should have no further continuous fold lines in the area of the lateral surface apart from the two dummy fold lines. By "continuous" fold lines, in particular, fold lines are understood that completely traverse the lateral surface. Folding lines that extend only through a part or a portion of the lateral surface, however, may be provided, which may be, for example, short fold lines for shaping, which are spaced from the edges of the lateral surface or so-called "auxiliary edge stumps" act. Preferably, the packing jacket has only the two apparent fold lines no more fold lines. By dispensing with fold lines, packaging with curved, edge-free surfaces can be produced.

The invention is therefore based on the idea not to fold the packing casing along fold lines which form the edges of the packaging produced from the packing casing. Instead, real fold lines are dispensed with in the area of the entire lateral surface and the packing jacket is to be folded exclusively along "dummy fold lines" which later do not form any edge of the packaging. A folding along the Scheinfaltlinien therefore takes place only in the packing jacket, but not in the packaging produced therefrom. This allows a free design of the packaging geometry and in particular allows the production of packaging with curved, edge-free packaging. By "continuous" fold lines are meant folding lines that completely traverse the lateral surface, for example from the bottom region to the gable region. Preferably, the packing jacket has no further fold lines in the area of the entire lateral surface except for the two dummy fold lines.

According to an embodiment of the packing jacket it is provided that the packing casing is folded flat along both apparent fold lines by an angle of approximately 180 ° in each case. The packing jacket is folded flat around the dummy grooves so that a front portion and a rear portion of the packing jacket lie on top of each other. The folding by an angle of about 180 ° allows particularly flat packing coats. This allows a space-saving stacking of packaging coats, which facilitates, for example, the transport. In this way, the packing shells can be produced at a different location than the filling and production of the packaging takes place. Preferably, the packing jacket is folded outward along both apparent fold lines.

A further embodiment of the packing jacket provides that the two dummy fold lines run parallel to one another. The two apparent fold lines are straight and preferably run parallel to one another. The parallel arrangement has the advantage that the Scheinfaltlinien can be particularly easily imprinted in the composite material. A further advantage of the parallel arrangement of the dummy fold lines is that the packing jacket can be produced from a rectangular blank and no more complicated geometries (for example trapezoidal blanks) are required.

A further embodiment of the package jacket provides that the dummy fold lines are embossed from the inside to the outside of the package jacket and / or from the outside to the inside of the package jacket. Depending on the position and folding direction of a folding line, a change in the embossing direction can lead to better folding results. In addition, in this way at the same time or in a production step with the Scheinfaltlinien - not intended for folding - outwardly directed and protruding lines are generated, for example, serve to better grip the packaging and secure can. The packing jacket may be provided with a combination of two embossing directions.

In a further embodiment of the packing jacket it is proposed that the composite material of the packing jacket has a thickness in the range between 110 g / m ² and 400 g / m ² , in particular between 150 g / m ² and 250 g / m ² . A strength in this area has proven to be a good compromise between low cost and low weight (as thin as possible composite material) and sufficient mechanical properties (as thick composite material).

A further embodiment of the packing jacket provides that the composite material has at least one layer of paper or paperboard which is covered at the edge of the longitudinal seam running inside the packing jacket. The cover of the paper layer or cardboard layer has the purpose of avoiding contact between the contents of the packaging and this layer. This serves, on the one hand, to prevent leakage of liquid through the paper layer or paperboard layer which is not liquid-tight and, on the other hand, to protect the contents of the packaging from contamination by the paper layer or paperboard layer (for example fibers of the pulp).

For this embodiment, it is further proposed that the layer of paper or paperboard is covered by a sealing strip and / or by flipping the composite material in the region of the longitudinal seam. One possibility of the cover is the attachment of a separate sealing strip. The sealing strip may for example be made of the same material as the innermost layer of the composite material and glued or welded to this camp. Another possibility of the cover is to fold or fold over the composite material in the region of the longitudinal seam. In this way, no longer all layers, but only the innermost layer of the composite material appear at the edge of the longitudinal seam extending inside the package jacket. However, the innermost layer must anyway be made of a material that is suitable for contact with the contents of the packaging.

In a further embodiment of the packing jacket, the composite material is in the range of Peeled longitudinal seam. By a "shelled" composite material is meant a composite material which has fewer layers in the peeled area than in the remaining areas. The peeling has the advantage of a less pronounced increase in thickness, in particular in the region of overlaps of several layers of material. Therefore, the use of peeled composite material is particularly advantageous if the composite material is folded or folded over - for example in the region of the longitudinal seam.

According to a further embodiment of the packing jacket it is provided that the packing casing is open both in the region of the bottom sealing surface and in the area of the gable sealing surface. In other words, the packing jacket has two openings, wherein an opening is arranged in the region of the later floor and wherein the other opening is arranged in the region of the later gable. Through the two opposite openings of the packing jacket can be folded particularly simple, whereby the shape of a tube or a sleeve ("sleeve") is formed. An advantage of double-sided open packaging shells lies in the variable design possibilities of the floors and gables.

According to a further embodiment of the packing jacket it is provided that the bottom sealing surface is separated from the lateral surface by a bottom folding line and / or that the gable sealing surface is separated from the lateral surface by a gable folding line. By the sealing surfaces are separated by fold lines of the lateral surface, the two sealing surfaces can be inclined in the manufacture of the packaging, in particular during welding, along a defined line relative to the lateral surface. In the region of the bottom sealing surface, that is to say outside the bottom fold line, and / or in the region of the gable sealing surface, ie outside the gable folding line, the packing jacket preferably has no further continuous fold lines except for the two dummy fold lines. Most preferably, the packing jacket has no further fold lines in these areas except for the two dummy fold lines.

A further embodiment of the packing jacket provides that the fold lines do not intersect, but maintain a minimum distance in the range between 0.1 mm and 3.0 mm, in particular between 0.8 mm and 2.5 mm to each other. In other words, the fold lines are to approach, but form no real intersections. The cutting of two converging fold lines can be prevented, for example, by interrupting at least one of these fold lines in the region of the actual point of intersection. This design is based on the idea that intersecting fold lines represent a particularly high load on the package jacket, which can lead to damage of the package jacket during folding. This in turn can lead to leaky packaging. By maintaining a "safety margin" between fold lines, these loads can be reduced.

After a further embodiment of the packing jacket is finally provided that the longitudinal seam connects the two outer portions of the lateral surface with each other. After this training, the longitudinal seam should thus be arranged in the region of the outer lateral surfaces and divide them into two subregions. This has the advantage that the inner region of the lateral surface - which forms the front surface of the packaging, which the customer pays the most attention to - can be made seamless. The two outer regions of the lateral surface can be of the same width (central longitudinal seam) or of different width (laterally offset longitudinal seam).

The object described above is also achieved by a packaging comprising: a packing jacket of a composite material with at least one layer of paper or paperboard, with a bottom sealing surface and with a gable sealing surface, a bottom element which is connected to the bottom sealing surface, in particular welded, and a Gable element which is connected to the Giebelsiegelfläche, in particular welded. The packaging is characterized in that the bottom element and / or the gable element comprises a composite material, in particular a composite material with at least one layer of paper or paperboard. The composite material - or at least some layers thereof - may be made of sheet material, for example.

It is therefore intended not only the packing jacket, but also the bottom element and / or the gable element of a composite material - ie a multilayer material - produce. Preferably, also the composite material of the bottom element and / or the gable element has at least one layer of paper or cardboard. Most preferably, the same composite material is used for the bottom element and / or the gable element as for the packing jacket; in this respect, reference is made to the above statements. At least one plastic layer is provided on both sides of the paper layer or cardboard layer. Optionally, an aluminum layer may also be provided. The use of such a laminate for the bottom element and / or the gable element has over solid plastic parts (eg injection molded parts) the advantage of lower costs, a lower weight, and higher elasticity. Compared to a laminate, which consists exclusively of a plastic film or several Plastic films, the use of an additional layer of paper or paperboard has the advantage of increasing the stiffness of the laminate.

According to one embodiment of the packaging, it is provided that the packaging has a packing jacket according to one of claims 1 to 12. When the package is made from any of the package shells described above, many of the features and benefits of the package sheath also occur in the package. A particular advantage is that the packaging in the region of the lateral surface has no angular folding edges, although it was made from a packing jacket, which is folded in two places. This is achieved by "folding back" the package casing during the production of the packaging along the two dummy fold lines so that the partial regions of the lateral surface adjoining the dummy fold lines again transition approximately continuously into each other. The dummy fold lines do not form the edges of the packaging, but are - barely visible - in the outer surface of the packaging. Instead of straight, angular folding edges so a package with an individually shaped, for example, curved lateral surface is to be achieved. The packaging preferably has a volume in the range between 50 ml and 4000 ml, in particular between 200 ml and 1500 ml, preferably between 250 ml and 1000 ml. Preferably, the packaging is in one piece. In particular, the part of the packaging made of the composite material is preferably in one piece in any case. This part of the package may be supplemented by other elements, for example a pouring element (e.g., a plastic folding or turning cap) or a drinking aid (e.g., a straw).

In a further embodiment of the packaging it is provided that the bottom element has a bottom region and an edge region, wherein the edge region is directed inward or outward. Alternatively or additionally, it is provided that the gable element has a gable area and an edge area, wherein the edge area is directed inwards or outwards. The gable area and the floor area serve to form the gable or bottom of the package; these parts are therefore usually visible from the outside. By contrast, the edge regions can serve to connect the bottom element or the gable element to the packing jacket. The edge areas can be directed to "inside" (ie to the middle of the packaging) or to "outside". An inward orientation, for example, optical advantages, since inward edge areas are barely visible from the outside. An orientation to the outside, however, has manufacturing advantages, since the edge areas are easily accessible, which facilitates, for example, the welding. Outwardly directed edge areas may also be desired in the area of the floor, as they form a defined, circumferential footprint, which allows the packaging a stable state. The bottom element and / or the gable element may be formed from a flat, flat blank of a composite material, the edge regions being brought into their angled (inwardly or outwardly) angled position by folding. If the edge regions of the floor element and / or the gable element are directed inwards and have a layer of paper or cardboard, it is preferred that the edge of the paper or cardboard layer running inside the packaging is covered. The cover can be done for example by a sealing strip and / or by folding the composite material. This is to prevent liquid from penetrating into the paper or cardboard layer.

In a further embodiment of the packaging, it is provided that the gable element has a screw cap. In the region of the gable element, a pouring opening may be provided. By providing a screw cap, the underlying pour spout can be resealed. This has hygienic benefits and can extend the shelf life of the contents of the package. As an alternative to a screw cap can also be provided a snap closure. Alternatively, or in addition to the screw cap or the snap closure, the gable element may have an overcoated hole (OCH) for piercing a straw.

In a further embodiment of the packaging, it is finally provided that the packaging has a round or oval cross-sectional area, in particular in the region of the packing jacket. After this training, the packing jacket should have a curved, but edge-free lateral surface. Packaging with a round or oval cross-sectional area fits comfortably in your hand and is visually appealing. In addition, packages with a curved outer surface can be cleaned and sterilized more easily and effectively before filling than packaging with angled edges. In addition, in particular, packaging with a round or approximately round cross-sectional area has the advantage that, given a given volume, less material is required in comparison with parallelepipedic packaging, since the surface of the packaging is smaller.

Finally, the invention relates to a method for producing a packaging.

Due to the aforementioned disadvantages of high-frequency welding, there is a need for alternative methods of welding packages. In this regard, in the WO 2006/048286 A1 For example, proposed to connect several parts of a tubular bag together by a friction welding. Friction welding processes are touching welding processes and have the advantage that a wide variety of materials can be welded together. In particular, the weldability of plastics is not limited to (di) polar plastics. Furthermore, unlike inductive welding, weldability is not limited to electrically conductive materials. In addition, friction welding processes are characterized by low energy consumption. A disadvantage of friction welding, however, lies in the fact that the parts to be welded are moved under pressure relative to each other and are mechanically stressed. This can be particularly problematic with multilayer composite materials with a layer of paper or paperboard and lead to a detachment of the other layers of the composite material ("delamination") due to the strong compliance of paper or paperboard. Another disadvantage of friction welding is the risk of wrinkling, which can lead to leaks. To avoid wrinkling is in the WO 2006/048286 A1 proposed to stretch the materials to be welded prior to welding. A disadvantage of this approach, however, is that only certain - correspondingly stretchable - materials can be welded together. The application of the friction welding process is therefore in the WO 2006/048286 A1 limited to plastic films or plastic laminates. Stretching is hardly possible, in particular in the case of composite materials with a layer of paper or paperboard (risk of fiber tears) or aluminum (risk of tearing).

Against this background, the invention is based Aufgrabe to design the method described above and further develop that the production of packaging - especially multi-part packaging - is made possible with complex geometry of inexpensive composite material.

This object is achieved according to the invention by a method for producing a packaging, comprising the following steps: a) providing a packing jacket made of a composite material with at least one layer of paper or paperboard, with a bottom sealing surface and with a gable sealing surface, b) providing a bottom element and / or a gable element, wherein the bottom element and / or the gable element comprises a composite material, in particular a composite material with at least one layer of paper or paperboard, c) providing a welding device, in particular a friction welding device, d) folding back the packing jacket along both apparent fold lines, and e) connecting the base element to the bottom sealing surface and / or connecting the gable element to the gable sealing surface, the joining being effected by a welding process, in particular by a friction welding process. The joining in step e) can be carried out in particular by an ultrasonic friction welding process. This is understood to mean methods in which the frequency is in the range between 15 kHz and 50 kHz and in which the amplitude is in the range of 60 μm or less.

Surprisingly, it has been found in tests that multilayer composite materials of different materials - in particular composite materials, which in addition to several plastic layers also have a layer of paper or cardboard - are connected to one another by Reibschweißverfahren. This is made possible, for example, by the fact that in any case the two material layers which are in direct contact with one another during welding have suitable properties. Preferably, these two layers are layers of plastic. PE (polyethylene), HDPE (high density polyethylene), LDPE (low density polyethylene) or PA (polyamide) can be used in particular for the layers to be welded together. Particularly good welding results were achieved if in step a) a packing jacket is provided whose paper layer or cardboard layer has a moisture content in the range between 5% and 15%, in particular between 7% and 12% (in each case mass fraction). Very good welding results have also been achieved if the direction of the relative movement during friction welding approximately corresponds to the orientation of the fibers in the paper or cardboard layer in the packing jacket. This can be achieved, for example, by aligning the fibers of the packing jacket along its central axis (that is, from the bottom region to the gable region) and at least one of the welding tools (for example a sonotrode) in any event also being moved back and forth substantially in this direction (main vibration direction). This can be explained by the fact that the composite material in the direction of the fibers has increased rigidity and reduced damping.

The method may be supplemented by the following step, which may be performed after step d) and before step e): e0) positioning the packing jacket and / or the bottom element and / or the gable element relative to the welding device. For positioning, certain easily (e.g., mechanically) recognizable areas of the package sheath may be utilized, such as the longitudinal seam and / or a sham fold line.

According to one embodiment of the method, it is provided that in step a) a packing jacket according to one of claims 1 to 12 is provided. When the package is made from any of the package shells described above, many of the features and benefits of the package sheath also occur in the package. A particular advantage is that the packaging in the region of the lateral surface has no angular folding edges, although it was made from a packing jacket, which is folded in two places. This is achieved by "folding back" the package casing during the production of the packaging along the two dummy fold lines so that the partial regions of the lateral surface adjoining the dummy fold lines again transition approximately continuously into each other. The dummy fold lines do not form the edges of the packaging, but are - barely visible - in the outer surface of the packaging. Instead of straight, angular folding edges so a package with an individually shaped, for example, curved lateral surface is to be achieved. The curved but edge-free lateral surfaces allow a good weldability, since the welding tools can be easily adapted to the shell geometry.

A further embodiment of the method provides that the friction welding device has an anvil and a sonotrode. The materials to be welded should be compressed between the anvil and the sonotrode.

According to a further embodiment of the method, it is provided that the anvil has a contact surface with an anvil angle in the range between 5 ° and 15 °, in particular between 6 ° and 10 °. Alternatively or additionally, it is provided that the sonotrode has a contact surface with a sonotrode angle in the range between 5 ° and 15 °, in particular between 6 ° and 10 °. By having the anvil and / or the sonotrode an angled contact surface, the welding tools can be easily brought to the surfaces to be welded. A previous expansion of the surfaces to be welded is therefore not required. Instead, for example, folding lines can be provided which allow an inclination of the surfaces to be welded, and thus an adaptation to the inclined welding tools.

According to a further embodiment of the method, it is provided that in step e) the sonotrode vibrates while the anvil is stationary. The vibration of the sonotrode takes place during the welding process in at least one direction; but it can also be done in several directions.

According to a further embodiment of the method, it is finally provided that in step e) in the area of the bottom sealing surface and / or in the area of the gable sealing surface, a completely circumferential weld seam is produced. Due to the completely circumferential weld, an optimal sealing of the packaging along its entire circumference is achieved. Preferably, the welding tools (esp. Anvil, sonotrode) are shaped such that they can cover the regions to be welded (bottom sealing surface and / or gable sealing surface) in the region of the entire weld seam to be produced, so that the weld seam can be produced in one step. This can be achieved in a packaging with a round cross-sectional area, for example, that the internally disposed welding tool (eg the sonotrode) is approximately cylindrically shaped and has a circumferential - outwardly directed - contact surface and that the externally arranged welding tool (eg the anvil) is approximately annular is shaped and has a circumferential - inwardly directed - contact surface.

• 1A: einen aus dem Stand der Technik bekannten Zuschnitt zum Falten eines Packungsmantels,
• 1B: einen aus dem Stand der Technik bekannten Packungsmantel, der aus dem in 1A gezeigten Zuschnitt gebildet ist, im flach gefalteten Zustand,
• 1C: den Packungsmantel aus 1B im aufgefalteten Zustand,
• 1D: den Packungsmantel aus 1C mit vorgefalteten Boden- und Giebelflächen,
• 1E: eine aus dem Stand der Technik bekannte Verpackung, die aus dem in 1A gezeigten Zuschnitt gebildet ist, nach dem Verschweißen,
• 1F: die Verpackung aus 1E mit angelegten Ohren,
• 2A: einen Zuschnitt zur Herstellung eines erfindungsgemäßen Packungsmantels,
• 2B: einen erfindungsgemäßen Packungsmantel, der aus dem in 2A gezeigten Zuschnitt gebildet ist, in deiner Vorderansicht,
• 2C: den Packungsmantel aus 2B in einer Rückansicht,
• 2D: den Packungsmantel aus 2B und 2C im aufgefalteten Zustand,
• 2E: den Packungsmantel aus 2D mit Bodenelement und Giebelelement,
• 2F: eine erfindungsgemäße Verpackung, die aus dem in 2E gezeigten Packungsmantel gebildet ist,
• 3A: den Giebelbereich der in 2F gezeigten Verpackung im Querschnitt,
• 3B: den Bodenbereich der in 2F gezeigten Verpackung im Querschnitt,
• 4A: einen Schritt eines erfindungsgemäßes Verfahrens zur Herstellung des Giebelbereiches der in 2F gezeigten Verpackung,
• 4B: einen weiteren Schritt eines erfindungsgemäßes Verfahrens zur Herstellung des Giebelbereiches der in 2F gezeigten Verpackung,
• 4C: einen Schritt eines erfindungsgemäßen Verfahrens zur Herstellung des Bodenbereiches der in 2F gezeigten Verpackung, und
• 4D: einen weiteren Schritt eines erfindungsgemäßen Verfahrens zur Herstellung des Bodenbereiches der in 2F gezeigten Verpackung.

The invention will be explained in more detail with reference to a drawing showing only a preferred embodiment. In the drawing show:

• 1A a blank known from the prior art for folding a packing jacket,
• 1B : A known from the prior art packing jacket, consisting of the in 1A formed blank, in the flat folded state,
• 1C : the packing jacket off 1B in the unfolded state,
• 1D : the packing jacket off 1C with prefolded floor and gable surfaces,
• 1E : A known from the prior art packaging, which consists of the in 1A formed blank, after welding,
• 1F : the packaging off 1E with attached ears,
• 2A : a blank for producing a packing jacket according to the invention,
• 2 B : a packing jacket according to the invention, which consists of the in 2A formed blank is formed in your front view,
• 2C : the packing jacket off 2 B in a rear view,
• 2D : the packing jacket off 2 B and 2C in the unfolded state,
• 2E : the packing jacket off 2D with floor element and gable element,
• 2F a packaging according to the invention, which consists of the in 2E formed packing jacket is formed,
• 3A : the gable area of in 2F shown packaging in cross section,
• 3B : the bottom area of the in 2F shown packaging in cross section,
• 4A : a step of an inventive method for producing the gable area of in 2F shown packaging,
• 4B a further step of a method according to the invention for the production of the gable area of the in 2F shown packaging,
• 4C : a step of a method according to the invention for producing the bottom region of the in 2F shown packaging, and
• 4D a further step of a method according to the invention for producing the bottom area of the in 2F shown packaging.

In 1A is a blank known in the art 1 represented, from which a packing jacket can be formed. The cut 1 may comprise several layers of different materials, for example paper, cardboard, plastic or metal, in particular aluminum. The cut 1 has several fold lines 2 on that folding the blank 1 should facilitate and the cutting 1 split into several areas. The cut 1 can be in a first side surface 3 , a second side surface 4 , a front surface 5 , a back surface 6 , a sealed area 7 , Floor surfaces 8th and gable surfaces 9 be divided. From the cut 1 a packing jacket can be formed by cutting the blank 1 folded like that 5, that the sealing surface 7 with the front surface 5 connected, in particular can be welded.

1B shows a known from the prior art packing jacket 10 in the flat folded state. Already related to 1A described areas of the packing jacket are in 1B provided with corresponding reference numerals. The packing jacket 10 is from the in 1A shown blank 1 educated. For this purpose, the blank was 1 folded so that the sealing surface 7 and the front surface 5 are arranged overlapping, so that the two surfaces can be welded together flat. The result is a longitudinal seam 11 , In 1B is the packing coat 10 shown in a flat folded state. In this state, there is a side surface 4 (in 1B hidden) under the front surface 5 while the other side surface 3 on the back surface 6 (in 1B covered). In the flat folded state, several pack coats 10 be stacked particularly space-saving. Therefore, the packing coats 10 often stacked at the place of manufacture and transported in batches to the place of filling. Only there are the packing coats 10 - Mostly already within a filling machine - stacked and unfolded to be filled with content, such as food. The filling can be done under aseptic conditions.

In 1C is the packing coat 10 out 1B shown in the unfolded state. Again, those are already related 1A or 1B described areas of the packing jacket 10 provided with corresponding reference numerals. The unfolded state is understood to be a configuration in which between the two adjacent surfaces 3 . 4 . 5 . 6 forms an angle of about 90 °, so that the packing jacket 10 - Depending on the shape of these surfaces - has a square or rectangular cross-section. Accordingly, the opposite side surfaces 3 . 4 arranged parallel to each other. The same applies to the front surface 5 and the back surface 6 ,

1D shows the packing jacket 10 out 1C in the pre-folded state, ie in a state in which the fold lines 2 both in the area of floor areas 8th as well as in the area of the gable surfaces 9 have been prefolded. Those areas of the floor surfaces 8th and the gable surfaces 9 attached to the front surface 5 and to the back surface 6 abut, are also called rectangular areas 12 designated. The rectangular areas 12 are folded inwards during the pre-folding and later form the bottom or the gable of the packaging. Those areas of the floor surfaces 8th and the gable surfaces 9 attached to the side surfaces 3 . 4 adjacent, however, are called triangular surfaces 13 designated. The triangular surfaces 13 are folded outwards at the prefolding and form protruding areas of excess material, which are also called "ears" 14 be referred to and applied in a later manufacturing step - such as by adhesive - to the packaging.

In 1E is a packaging known from the prior art 15 coming from the in 1A formed blank is shown shown. The packaging 15 is shown after welding, ie in the filled and closed state. In the area of floor surfaces 8th and in the area of the gable surfaces 9 arises after closing a fin seam 16 , In 1E stand the ears 14 and the fin seam 16 from. Both the ears 14 as well as the fin seam 16 be in a later manufacturing step, such as by welding - in particular comprising activating and pressing - applied.

1F shows the packaging 15 out 1E with attached ears 14 , In addition, the fin seams are also 16 to the packaging 15 created. The upper, in the area of the gable area 9 arranged ears 14 are folded down and flat to the two side surfaces 3 . 4 created. Preferably, the upper ears 14 with the two side surfaces 3 . 4 glued or welded. The lower, in the area of the floor area 8th arranged ears 14 are also folded down, but flat to the bottom of the package 15 created by two rectangular areas 12 the floor area 8th is formed. Preferably, the lower ears are 14 with the packaging 15 - Especially with the rectangular areas 12 - glued or welded.

2A shows a blank 1' for producing a packing jacket according to the invention 10 ' , Already related to 1A to 1F described areas of the blank are in 2A provided with corresponding reference numerals. A difference to the cut 1 out 1A lies in the fact that the two side surfaces 3 . 4 , the front surface 5 and the back surface 6 to a single lateral surface 17 are summarized. The lateral surface 17 extends - apart from the sealing surface 7 - over the entire width of the blank 1' , Another difference is that the cut 1' in the area of the lateral surface 17 two dummy fold lines 18 having. The two pseudo folds 18 are straight and parallel to each other. Through the dummy fold lines 18 becomes the lateral surface 17 into an inner subarea 17A and in two outer sections 17B divided. The inner part 17A lies between the two fake fold lines 18 and the outer parts 17B lie next to or outside the two dummy fold lines 18 , Unlike the cut 1 out 1A are at the cutting 1' out 2A no floor space 8th and also no gable surfaces 9 provided because the bottom and the gable are formed of separate parts. This will be described later in detail. Instead, the blank indicates 1' out 2A in its lower part a bottom sealing surface 19 and in its upper part a Giebelsiegelfläche 20 on. The bottom sealing surface 19 is through a bottom fold line 21 from the adjacent area of the lateral surface 17 separated and the gable sealing surface 20 is through a gable folding line 22 from the adjacent area of the lateral surface 17 separated. The bottom fold line 21 and the gable folding line 22 run parallel to each other. The dummy folds 18 , the bottom fold line 21 and the gable folding line 22 do not intersect, but keep a minimum distance in the range between 0.1 mm and 3.0 mm, in particular between 0.8 mm and 2.5 mm to each other.

2 B shows a packing jacket according to the invention 10 ' who from the in 2A shown blank 1' is formed, in your front view. Already related to 1A to 2A described areas of the packing jacket are in 2 B provided with corresponding reference numerals. The packing jacket 10 ' is through two steps from the blank 1' emerged: First, the cut 1' along the two pseudo-folds 18 folded. Subsequently, the two subareas 17A . 17B the lateral surface 17 in the area of the sealing surface 7 connected together, in particular welded, creating a (in 2 B hidden) longitudinal seam 11 arises. The packing jacket 1' So has a circumferential, circumferentially closed structure with an opening in the bottom sealing surface 19 and with an opening in the area of the gable sealing surface 20 , In the front view is the inner part area 17A the lateral surface 17 visible, on both sides of the dummy folds 18 is limited. The remaining sections 17B the lateral surface 17 are on the back of the wrapper 10 ' and therefore in 2 B covered.

In 2C is the packing coat 10 ' out 2 B shown in a rear view. Already related to 1A to 2 B described areas of the packing jacket are in 2C provided with corresponding reference numerals. In the rear view are the two outer sections 17B the lateral surface 17 visible through the longitudinal seam 11 connected to each other and the two sides of the dummy folds 18 is limited. The inner part 17A the lateral surface 17 is on the front of the wrapper 10 ' and therefore in 2C covered.

2D shows the packing jacket 2 B and 2C in the unfolded state. Already related to 1A to 2C described areas of the packing jacket are in 2D provided with corresponding reference numerals. The unfolded state is due to a refolding of the packing jacket 1' along the through the lateral surface 17 extending pseudo-folds 18 reached. The refolding takes place by about 180 °. The refolding along the pseudo-folds 18 As a result, the two to the Scheinfaltlinie 18 adjacent subareas 17A . 17B the lateral surface 17 no longer flat on each other, but smoothly merge into each other. The packing jacket 10 ' is therefore only in its flat state ( 2 B . 2C) along the fake fold lines 18 folded; in the unfolded state ( 2D) is the packing coat 10 ' (as well as the resulting packaging), however, no longer along the Scheinfaltlinien 18 folded. Hence the term "sham" fold lines 18. At the in 2D shown embodiment, the packing jacket 10 ' an approximately round cross-sectional area; alternatively but also other cross-sectional areas can be reached, for example oval cross-sectional areas.

In 2E is the packing jacket off 2D with floor element 23 and gable element 24 shown. Already related to 1A to 2D described areas of the packing jacket are in 2E provided with corresponding reference numerals. The floor element 23 has a floor area 23A and a peripheral edge area 23B on and the gable element 24 has a gable area 24A and your surrounding edge area 24B on. The floor area 23A and the gable area 24A are roughly shaped; Alternatively, however, other forms are achievable, such as oval shapes. The border area 23B of the floor element 23 and the border area 24B of the gable element 24 are approximately cylindrically shaped. The gable element 24 is with a screw cap 25 fitted.

2F shows a packaging according to the invention 15 ' coming from the in 2E shown packing jacket 10 ' is formed. Already related to 1A to 2E described areas of packaging are in 2E provided with corresponding reference numerals. The packaging 15 ' was next to the packing coat 10 ' also from the floor element 23 and the gable element 24 formed, so it is a multipart - more precisely: a three-piece - packaging 15 ' , Alternatively, the package could also be designed only in two parts, with dispensing with a separate floor element or on a separate gable element and the packing jacket itself forms the bottom or the gable. The three parts were joined together, first by the floor element 23 and the gable element 24 from below or from above into the packing jacket 10 ' have been inserted. Subsequently, the border area 23B of the floor element 23 with the bottom sealing surface 19 of the wrapper 10 ' connected and the border area 24B of the gable element 24 is with the gable sealing surface 20 of the wrapper 10 ' been connected. The connections can be produced, for example, by welding methods, in particular by friction welding methods. Alternatively, the compounds can be generated by adhesive methods.

In 3A is the gable area of the in 2F shown packaging 15 ' shown in cross section; 3B on the other hand shows the floor area of the 2F shown packaging in cross section. Already related to 1A to 2F described areas of packaging are in 3A and 3B provided with corresponding reference numerals. In cross-section, it can be clearly seen that the edge area 23B of the floor element 23 with the bottom sealing surface 19 of the wrapper 10 ' is connected and that the edge area 24B of the gable element 24 with the gable sealing surface 20 of the wrapper 10 ' connected is. In addition, it can be seen that the bottom fold line 21 and the gable folding line 22 in the material of the packing jacket 10 ' are impressed or impressed, so that the packing jacket 10 ' in the area of the bottom fold line 21 and the gable folding line 22 has a reduced thickness or strength. In the in 3A and 3B example shown are the bottom fold line 21 and the gable folding line 22 from the outside into the packing jacket 10 ' stamped. Alternatively, it is also possible the bottom fold line 21 and the gable folding line 22 from the inside into the packing jacket 10 ' memorize.

4A shows a step of a method according to the invention for the production of the gable area of in 2F shown packaging; 4B shows a further step of a method according to the invention for the production of the gable area of in 2F shown packaging. Already related to 1A to 3B described areas of packaging are in 4A and 4B provided with corresponding reference numerals. The illustrated manufacturing step is the joining of the packing jacket 10 ' with the gable element 24 , For this purpose, a friction welding device 26 provided an anvil 27 and a sonotrode 28 includes. The anvil 27 has a contact surface 27A on that in relation to a central axis M is arranged obliquely and an anvil angle α in the range between 5 ° and 15 °, in particular between 6 ° and 10 °. The sonotrode 28 has a contact surface 28A on that in relation to a central axis M is arranged obliquely and a sonotrode angle β in the range between 5 ° and 15 °, in particular between 6 ° and 10 °. At the central axis M it is the central axis of the wrapper 10 ' or the subsequent packaging 15 ' to which the two surfaces to be joined (Giebelsiegelfläche 20 , Border area 24B) run parallel.

In 4A become the anvil 27 and the sonotrode 29 moved into their working positions (shown schematically by arrows). The anvil 27 located for this purpose inside the packing jacket 10 ' in the area of the gable element 24 and the sonotrode 28 is outside the wrapper 10 ' in the area of the gable element 24 , The anvil 27 is preferably approximately cylindrically shaped and can through the (not yet closed) bottom portion of the packing jacket 10 ' in the packing jacket 10 ' be inserted. The sonotrode 28 On the other hand, it is preferably annular in shape, so that it completely surrounds the packing jacket 10 ' runs around. In 4B a friction welding operation takes place in which a relative movement is generated between the two surfaces to be welded; in this case between the edge area 24B of gable element 24 and the gable sealing surface 20 of the wrapper 10 ' , To achieve this, the two surfaces to be welded from the contact surface 27A of the anvil 27 and the contact surface 28A the sonotrode 28 pressed together. In the example shown, the sonotrode vibrates 28 in the axial direction, ie in the direction of the central axis M while the anvil 27 resting (vibration schematically represented by a double arrow). In this way, a relative movement between the two surfaces to be welded is generated, ie between the edge region 24B of the gable element 24 and the gable sealing surface 20 of the wrapper 10 ' , As a result of the friction, the contacting plastics heat up, become viscous and form a weld 29 ,

4C shows a step of a method according to the invention for the preparation of the bottom portion of in 2F shown packaging; 4D shows a further step of a method according to the invention for the preparation of the bottom portion of in 2F shown packaging. Already related to 1A to 4B described areas of packaging are in 4C and 4D provided with corresponding reference numerals. The illustrated manufacturing step is the joining of the packing jacket 10 ' with the bottom element 23 , This in turn is a friction welding device 26 provided an anvil 27 and a sonotrode 28 includes. The anvil 27 has a contact surface 27A on that in relation to a central axis M is arranged obliquely and an anvil angle α in the range between 5 ° and 15 °, in particular between 6 ° and 10 °. The sonotrode 28 has a contact surface 28A on that in relation to a central axis M is arranged obliquely and a sonotrode angle β in the range between 5 ° and 15 °, in particular between 6 ° and 10 °. At the central axis M it is the central axis of the wrapper 10 ' or the subsequent packaging 15 ' to which the two surfaces to be joined (bottom sealing surface 19 , Border area 23B) run parallel.

In 4C become the anvil 27 and the sonotrode 29 moved into their working positions (shown schematically by arrows). The anvil 27 For this purpose, it is located outside the packing jacket 10 ' in the area of the floor element 23 and the sonotrode 28 is located below the floor element 23 , The sonotrode 28 is preferably approximately cylindrically shaped and can from below into the bottom element 23 be inserted. The anvil 27 On the other hand, it is preferably annular in shape, so that it completely surrounds the packing jacket 10 ' runs around. In 4D a friction welding operation takes place in which a relative movement is generated between the two surfaces to be welded; in this case between the edge area 23B of the floor element 23 and the bottom sealing surface 19 of the wrapper 10 ' , To achieve this, the two surfaces to be welded from the contact surface 27A of the anvil 27 and the contact surface 28A the sonotrode 28 pressed together. In the example shown, the sonotrode vibrates 28 in the axial direction, ie in the direction of the central axis M while the anvil 27 resting (vibration schematically represented by a double arrow). In this way, a relative movement between the two surfaces to be welded is generated, ie between the edge region 23B of the floor element 23 and the bottom sealing surface 19 of the wrapper 10 ' , As a result of the friction, the contacting plastics heat up, become viscous and form a weld 29 ,

LIST OF REFERENCE NUMBERS

1, 1 ':

cut

2:

fold line

3, 4:

side surface

5:

front surface

6:

rear surface

7:

sealing surface

8th:

floor area

9:

gable area

10, 10 ':

pack casing

11:

longitudinal seam

12:

rectangular area

13:

triangular face

14:

ear

15, 15 ':

packaging

16:

fin seal

17:

lateral surface

17A, 17B:

Subarea (the lateral surface 17 )

18:

Scheinfaltlinie

19:

Soil sealing surface

20:

Gable sealing surface

21:

bottom folding

22:

Giebefaltlinie

23:

floor element

23A:

Floor area (of the floor element 23 )

23B:

Edge area (of the floor element 23 )

24:

gable element

24A:

Gable area (of the gable element 24 )

24B:

Edge area (of the gable element 24 )

25:

screw

26:

friction welding

27:

Anvil

27A:

Contact surface (of the anvil 27 )

28:

sonotrode

28A:

Contact surface (the sonotrode 28 )

29:

Weld

α:

Amboßwinkel

β:

Sonotrodenwinkel

M:

central axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2015/003852 A9 [0005]
• EP 0936150 B1 [0006]
• US 6042527 [0006]
• US 4471882 [0009]
• WO 2006/048286 A1 [0033]

Claims (25)

A packing jacket (10 ') of a composite material for producing a package (15'), comprising: - a lateral surface (17) with an inner portion (17A) and with two outer portions (17B), - a bottom sealing surface (19) for connecting the A package jacket (10 ') having a bottom element (23), - a gable sealing surface (20) for connecting the package jacket (10') to a gable element (24), - a longitudinal seam (11) forming two edges of the composite material into a circumferential package jacket (11). 10 '), and - two dummy fold lines (18) which extend through the lateral surface (17), - wherein the bottom sealing surface (19) and the gable sealing surface (20) on opposite sides of the lateral surface (17) are arranged, and - Packing jacket (10 ') along both fake fold lines (18) is folded, characterized in that the packing jacket (10') in the region of the lateral surface (17) except the two dummy fold lines (18) no further continuous fold lines au fweist. Packing jacket after Claim 1 , characterized in that the packing jacket (10 ') is folded flat along both dummy fold lines (18) by an angle of approximately 180 ° each. Packing jacket after Claim 1 or Claim 2 , characterized in that the two dummy fold lines (18) extend parallel to each other. Packing coat after one of the Claims 1 to 3 , characterized in that the dummy fold lines (18) are embossed from the inside to the outside of the package jacket (10 ') and / or from the outside to the inside of the package jacket (10'). Packing coat after one of the Claims 1 to 4 , characterized in that the composite material of the packing jacket (10 ') has a thickness in the range between 110 g / m ² and 400 g / m ² , in particular between 150 g / m ² and 250 g / m ² . Packing coat after one of the Claims 1 to 5 , characterized in that the composite material comprises at least one layer of paper or paperboard, which is covered at the edge of the longitudinal seam (11) extending inside the packing jacket (10 '). Packing jacket after Claim 6 , characterized in that the layer of paper or paperboard is covered by a sealing strip and / or by flipping the composite material in the region of the longitudinal seam (11). Packing coat after one of the Claims 1 to 7 , characterized in that the composite material in the region of the longitudinal seam (11) is peeled. Packing coat after one of the Claims 1 to 8th , characterized in that the packing jacket (10 ') is open both in the area of the bottom sealing surface (19) and in the region of the gable sealing surface (20). Packing coat after one of the Claims 1 to 9 , characterized in that the bottom sealing surface (19) is separated from the lateral surface (17) by a bottom fold line (21) and / or that the gable sealing surface (20) is separated from the lateral surface (17) by a gable folding line (22). Packing jacket after Claim 10 , characterized in that the bottom fold line (21) and / or the gable folding line (22) do not intersect the dummy fold lines (18), but a minimum distance in the range between 0.1 mm and 3.0 mm, in particular between 0.8 mm and 2 , 5 mm to each other. Packing coat after one of the Claims 1 to 11 , characterized in that the longitudinal seam (11) connects the two outer portions (17B) of the lateral surface (17) with each other. A package (15 ') comprising: - a packing jacket (10') of composite material having at least one layer of paper or paperboard, a bottom sealing surface (19) and a pedestal sealing surface (20), - a bottom element (23) provided with the bottom sealing surface (19) is connected, in particular welded, and - a gable element (24), which is connected to the Giebelsiegelfläche (20), in particular welded, characterized in that the bottom element (23) and / or the gable element (24) a Composite material, in particular a composite material having at least one layer of paper or paperboard. Packaging after Claim 13 , characterized in that the package (15 ') a packing jacket (10') according to one of Claims 1 to 12 having. Packaging after Claim 13 or Claim 14 characterized in that the bottom member (23) has a bottom portion (23A) and an edge portion (23B), the edge portion (23B) being directed inwardly or outwardly. Packaging according to one of Claims 13 to 15 , characterized in that the gable element (24) has a gable area (24A) and a Edge region (24 B), wherein the edge region (24 B) is directed inwards or outwards. Packaging according to one of Claims 13 to 16 , characterized in that the gable element (24) has a screw cap (25). Packaging according to one of Claims 13 to 17 , characterized in that the packaging (15 ') has a round or oval cross-sectional area, in particular in the region of the packing jacket (10'). Method for producing a packaging (15 '), comprising the following steps: a) providing a packing jacket (10 ') of a composite material with at least one layer of paper or paperboard, with a bottom sealing surface (19) and with a gable sealing surface (20), b) providing a floor element (23) and / or a gable element (24), wherein the floor element (23) and / or the gable element (24) comprises a composite material, in particular a composite material with at least one layer of paper or paperboard, c) providing a welding device, in particular a friction welding device (26), d) folding back the packing jacket (10 ') along both dummy fold lines (18), and e) connecting the base element (23) to the bottom sealing surface (19) and / or connecting the gable element (24) to the gable sealing surface (20), wherein the connection is effected by a welding process, in particular by a friction welding process. Method according to Claim 19 , characterized in that in step a) a packing jacket (10 ') according to one of Claims 1 to 12 provided. Method according to Claim 19 or Claim 20 , characterized in that the friction welding device (26) has an anvil (27) and a sonotrode (28). Method according to one of Claims 19 to 21 , characterized in that the anvil (27) has a contact surface (27A) with an anvil angle (α) in the range between 5 ° and 15 °, in particular between 6 ° and 10 °. Method according to one of Claims 19 to 21 , characterized in that the sonotrode (28) has a contact surface (28A) with a sonotrode angle (β) in the range between 5 ° and 15 °, in particular between 6 ° and 10 °. Method according to one of Claims 19 to 23 , characterized in that in step e) the sonotrode (28) vibrates while the anvil (27) is stationary. Method according to one of Claims 19 to 24 , characterized in that in step e) in the region of the bottom sealing surface (19) and / or in the region of the gable sealing surface (20) a completely circumferential weld seam (29) is produced.

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