EP3024737B1 - Film wrapping module for containers as a component of a packaging machine, and method therefor - Google Patents

Description

The invention relates to a film wrapping module for wrapping containers along a transport path, in particular of a plurality of containers also arranged one above the other with a film, wherein the film wrapping module has a wrapping unit according to. The preamble of claim 1 and a method for film wrapping gem. Preamble of claim 12.

The containers have containers. Containers according to the invention are, for example, bottles, cans, tubes, pouches, each made of metal, glass and / or plastic, so for example PET bottles, but also other packaging, especially those for filling liquid or viscous products but are also suitable for receiving food, but also already to groups (multiple pack, container) combined containers. Container treatment plants are, for example, rinsers, fillers, cappers but also labeling machines. These can be circumferential design or linear design. Continuous-design container treatment systems have a transport star on which the containers are guided past a circular path, for example past labeling devices. Prior to labeling, the containers can be aligned with recognition features, so that each label can be applied to the container in the same orientation.

After the containers have been treated in the container treatment plant, they can be fed to a packaging machine. In detail, the production of the container is carried out, for example, in a so-called packaging machine in such a way that the containers on a transport plane of a conveyor rising and fed with its container axis in the vertical direction or substantially vertical direction in a mass transport or in a wide container flow in that the containers can have an arbitrary orientation with regard to distinctive containers and / or features, since the former orientation, that is to say orientation, is lost. This wide container flow is then converted by lane division into several single-lane container streams. In further process steps, the compartments of the later containers or their container groups forming the single-track container streams, the merging of the necessary number of containers in each case to a compacted container group, in which the container with multiple shell or peripheral surfaces, ie with the contact Or contact surfaces abut against each other, and that connecting the container of each group of containers to the compact and solid or stable container.

It is possible to connect the individual container of the container with each other, for example, a wrap is conceivable, for example, with a tether or other comprehensive element. Such a comprehensive element may be, for example, a carton blank or a foil section, which is placed around the relevant container and fastened accordingly. The cardboard ends can be glued together. The initially applied films can be shrunk in a shrink tunnel. It is also conceivable that the containers get a stabilizing base, which is designed as a cardboard blank, for example, on which the containers stand up. Such a base is useful if the subsequent container is to be formed, for example, of several layers of sub-packages, with several containers are stacked. It can be attacked on the base, so that one sub-package is set to the other. Subsequently, a comprehensive element can be provided to include the stacked containers. The carton blanks are preferably removed as such in the unfolded state from a magazine and can be folded before or after feeding to the subsequent container, with a correspondingly executed folding station is used. To form the film sections, a film roll is unrolled to form a film web, the relevant film sections being cut off from the film web. For this purpose, a film cutting station is useful, so that the respective film section has the required dimensions of each pack to be packaged. In a further embodiment, a spacer element may be arranged between the containers of the subsequent container, which is designed, for example, as a web or, for example, as a compartment. This compartment is usually made of a cardboard or cardboard, and is unfolded before insertion into the subsequent container, wherein an insertion station, which can be exemplified as a web inserter or compartment inserter, is used. But it is also possible to use a plurality of containers in receiving boxes, wherein the separating elements, so the webs or compartments quasi form honeycomb within the carton, in which the containers are arranged.

It is known to summarize or formulate several articles each into an article group and from the article groups using shrink films (eg US 7,726,464 A1 or US 5 065 856 A ) to produce fixed or transportable storage and transport units or containers. The disadvantage here is, inter alia, that the films used in this case and in particular the shrinking of the films caused by heat or energy input not inconsiderable costs.

It has also been proposed to produce transportable containers by virtue of the fact that the containers formed in each case into a group of containers are surrounded by a strapping around the container group (FIG. DE 10 2009 025 824 A1 . DE 10 2009 044 271 A1 . DE 41 26 212 A1 ), ie connected to each other to form a container, which is a particularly cost-effective and easy way to produce containers or transport and storage units. The strapping can also be glued to the containers. A disadvantage of the strapping is, however, that the first removal of a container from such a container remaining in the container containers are no longer held together by the strapping. This applies not only when the strapping is separated or cut, but also when it is possible to remove a container from the container without severing the strapping.

Furthermore, when transporting such containers on a belt conveyor there is always the danger that cylindrical or largely cylindrical articles, such as cans, bottles or containers, will assume a nesting position due to vibration, impact, etc., ie slip into the gap of the adjacent row. To prevent this In known containers, a very great tension must be placed on the strapping.

The DE 10 2006 037 105 A1 on the other hand deals with a method for assembling bottle packs, in which on both sides of a web a rotary star is provided which pushes bottle necks in brackets on flat carriers. The bottle package is still covered with a tape or wrapping (foil).

According to the DE 23 31 193 An adhesive is applied to containers in narrow areas or rows, each adjacent surfaces, which are not provided with adhesive, to allow gripping the package for the purpose of carrying. At the splice the containers stick together. The EP 2 096 039 A1 also discloses to provide container with an adhesive, but in addition also a shrink film is placed around the bottle package.

From the EP 2 500 296 A1 a device and a method for grouping piece goods along a conveyor line is known. By means of one-piece elements engaging in the flow, gaps between successive piece goods are formed. The one-piece elements are individually controllable in their feed movement and / or speed because of the gearless direct drives used along the movement path. The divider elements emerge from below the trajectory, divert a number of containers from the container stream, initially stop the container flow, creating a gap to the separated containers: the divider elements then accelerate and submerge again below the level of trajectory. In that sense, the combined EP 2 500 296 A1 actually only the before their registration or priority date known Einteiltechnik with Einteilfingern, which are arranged on rotating beams, with a drive system which is formed by gearless direct drives.

The DE 10 2011 081 705 A1 also deals with a method and apparatus for grouping containers. In this case, the device two conveyors at different speeds. The second conveyor is faster than the first conveyor. Thus, the containers reaching the second conveyor are moved faster than the containers on the first conveyor. This creates a gap between the containers on the second conveyor. By means of a sliding or retaining device, the containers are accelerated on the second conveyor, delayed and / or shifted from each other, so that the original gap is changed. In this case, for example, the lagging container is pushed onto the leading container. The corresponding acceleration is achieved by means of linear motor drives, with the individual elements of the sliding or retaining device being individually controllable.

By means of the film wrapping module, ie by means of the wrapping unit, the film or the foil blank is placed around the container. Usually, the feeding of, for example, the film section occurs from below the transport plane, wherein a first end of the film section seen in the transport direction is first conveyed through a gap between the conveyors under the foot-side end of the container. Preferably, the entire container is on the first end, which may extend slightly beyond the container seen in the transport direction, wherein the first end may also be slightly withdrawn. A driver then promotes the rest of the film section from the back around the container around, so that this is taken at least partially. In this case, the driver with the film section held on it overtakes the container in the transport direction, and guides the second end in the direction of the first end. When overhauling the container is braked, so that the actually achievable speed and thus the actual output is reduced. It is possible that the driver sucks the film section, so that the film section along the transport path is securely held on the driver. In the transport of the film section, this may, due to variation of the suction pressure, however, lose contact with the driver either partially or completely, so that the container is not followed correct and must be sorted out to successor stations quasi.

The driver is preferably on both sides in each case on a conveying element, e.g. guided on a chain conveyor and has a rod-like configuration, so for example as a crossbar. Of course, the driver can also be guided only on one side. The transverse web is thereby, as the film section from below the transport plane through the relevant conveyor out. Of course, the gap between the two conveyors has a dimension adapted to the dimension of the driver. Following the exit side of the driver from below the transport plane of course an entry side for the driver from above the transport plane in the relevant conveyor is provided, which of course must also have a corresponding gap, so that the driver from above the transport plane through the gap get below the transport plane can.

In this case, the second end of the film section is taken, so that the container passes with his foot on this. Thus, the film portion of the driver, since the tensile force which is exerted on the moving portion on the film portion is greater than the suction force with which the film portion is held on the driver. In this case, an overlap of the first end with the second end may be possible. However, even in this case, faults can occur which can lead to a sorting out of an improper container. The conveyor thus has a rear, which is arranged above the transport plane. The return strand is arranged correspondingly below the transport plane. In this case, a certain number of drivers is also provided, which have a static, ie unchangeable distance from each other. However, this disadvantageously causes a very high number of drivers, which are located along the return strand, which are thus quasi the actual task for wrapping the container withdrawn.

Further, it may be possible that several containers are stacked on top of each other, wherein the superposed containers should then be wrapped together with the film section. For example, two or three or more containers arranged one above the other. With the wrapping unit, therefore, such a total package can be wrapped with the film section. Of course, corresponding dimensional changes of both the impact module with its entrainment members and also with respect to the necessarily extended film portion would have to be carried out.

Such a conversion is, even if prefabricated components are used tedious and very time-consuming, since the retrofitting also requires an adjustment of the necessary division. Also, the transport of the film sections from below the transport plane to the containers, but also above the container when the driver must overtake the container in question is more difficult to accomplish, since the film sections are much longer and possibly wider, which cause problems with respect to the necessary handling if not countermeasures can be taken.

The object of the invention is to provide a device for wrapping containers of the type mentioned, which is improved by simple means.

The solution of this problem is achieved with a device having the features of patent claim 1.

Further developments, advantages and applications of the invention will become apparent from the following description of exemplary embodiments. In this case, all the features described in themselves or in any combination in principle subject of the invention.

According to the invention, the wrapping unit has a linear conveyor with a closed path of movement, on which moving elements rotate in a common direction, wherein at least one gripping element is arranged on the respective moving element. At the movement elements a plurality of gripping elements can be arranged, which independently can be controlled by each other. The gripping elements can be designed as a rod element, and extend at least along a partial section of a Hintrums the trajectory transverse to the transport direction.

The fact that the movement elements essentially revolve in a common direction means in the sense of the invention that the movement elements may be occasionally moved and briefly moved in a direction other than the common, actually predetermined direction of rotation, if, for example, to change a distance according to the given circumstances makes sense to the following or previous movement element. But here is another advantage of the invention by the movement elements are independently controllable in the movement path in their respective movement.

The linear transporter ideally has a closed trajectory on which the individual movement elements are arranged, which rotate. The movement elements can also be referred to as movers. The trajectory has linearly oriented trajectory sections and deflecting regions arranged therebetween, so that a closed trajectory is formed. The linearly oriented trajectory sections, which are also referred to as the rear and as the return strand, may have curved or obliquely oriented sections, in order, for example, to be curved. compensate for a height difference, or to form, for example, a change in direction in the horizontal direction.

The movement elements are individually controllable, so that each movement element can have a respective speed. Thus, the movement elements are independently controllable so that the respective movement element at the respective movement path section in its speed is equal to other on the respective movement path section moving elements, said movement element relative to other on the same path of movement respectively on the same path of movement Movement elements but also accelerated, delayed or even in its direction of movement can be reversed for a short time. This is advantageous since a very small number of movement elements can be provided, since the movement elements moving along the return strand can overtake the movement elements moving along the rear. The trajectory can of course have a lock for discharging unneeded or verifiable motion elements. Of course, the lock can also be used for sluicing. The respective movement elements can be controlled, for example, such that they are moved with adapted speed when taking over the film sections, or are subsequently braked and subsequently undergo a speed build-up, so that a smooth takeover of the film sections occurs, which along eg an acceleration section of the movement path the following be spaced.

The linear transporter is designed in the manner of an electromagnetic path, wherein the movement elements rotate gearless at this directly controllable. For this purpose, an interface of the movement path can be connected to a control unit. The linear transporter can therefore be an electromagnetic direct drive. The actual drive is effected by a dynamically controllable electromagnetic field along the rail or track, whereby the on the moving element, which can also be referred to as a mover arranged permanent magnet / -packung is moved by the magnetic force or the magnetic field controlled.

Another advantage of the invention is the fact that the movement elements can be controlled so that they are accelerated, and overtake the container. This ensures that the container can be transported at the maximum possible transport speed. Of course, this has an advantageous effect on increased output, as much more containers can be wrapped than before.

The gripping elements arranged on the movement elements can carry out any movement with respect to the linear transporter but also with respect to the movement element itself. So you are accordingly controlled in their degrees of freedom. An activation takes place in an ideal embodiment via a central unit, which can also cause the control of the movement elements.

By means of the movement elements, which rotate on the path of movement, which as already mentioned above is designed as a rail, the film sections can now be transported to the gripper elements, that is, held on the bar elements in a positionally secure manner.

The film sections are then placed in the required position under the container. The procedure is only similar to the conventional procedure. In other words, the film section is placed with one end under the container, the other end passes the container, and then also lays under the container. However, the advantage is that the foil section is merely held by the relevant gripping element, ie rod element. It is also expedient for the movement element to be accelerated in order to overtake the container, the gripping element, that is to say the rod element, being accelerated under the film in the running direction, ie being pulled away. In this respect, it can also be said that the gripping element, ie the rod element, virtually overtakes the film.

Alternatively, it is possible that a linear transporter is provided, which is arranged laterally to the transport plane. In this case, the linear transporter possibly has a trajectory section, which is arranged below the transport plane. At these the film sections could be taken and transported in the direction of the transport plane (takeover section). An adjoining trajectory section could extend away from the transport plane in an orientation-oriented manner. This riser section can be designed to be vertical or inclined. In a preferred embodiment, the rising trajectory section (riser section) extending in a direction parallel to the transport plane Pass over the end portion of the rear, to which one of the deflection followed. Here now begins the return strand, now followed by a falling trajectory section (case section) to put the second end of the film section under the container. In this case, the falling trajectory section preferably has an identical configuration as the rising trajectory section. Both do not have to be identical. This is possible because the respective movement elements can be controlled differently, which is why a predetermined division, which is required by rigidly arranged drivers, can be dispensed with. At the first deflection region, the return strand begins, which extends up to the other deflection region, to which in turn the transfer section adjoins. Between the fall portion and the second deflection region, in turn, an end portion of the return run extending parallel to the transport plane is preferably arranged. However, this end section is preferably arranged below the transport plane. For example, along the end portion of the return strand, the moving elements may preferably be accelerated so that the above-mentioned speed advantages can be utilized. As mentioned, the rear and the rear can be identical or different in their design.

The gripping elements, ie the rod elements can be movable relative to the movement elements, so that they could assume any position relative to the movement elements and relative to the transport route at any position along the movement path. Thus, it makes sense if the gripping, ie rod elements are arranged transversely to the transport path, and this virtually spanned, so that the film rest in the entire width of the rod element, so it can also rest. For example, along the return strand, the rod element could be moved to a different position relative to the transport path, which would require less space in the transverse direction. Of course, the rod element but also rigid, so immovably be arranged on the moving element.

It is ideal that several containers can run into the film wrapping module with the invention. This is possible since an originally necessary, fixed division is obsolete. Rather, the successive containers can run virtually arbitrarily narrow, since the movement elements, and the gripping element / rod element can be accelerated at the outlet of the film wrapping module. Thus, in the film wrapping unit two or more containers can be located at the same time, which are in the phase of the wrapping with a film section, in different stages of the wrapping.

In the embodiment described above, the gripping elements are designed as a rod element, wherein the rod elements are each assigned to a moving element. In this respect, only one side of the transport path, a single linear transporter can be arranged, which is quite sufficient. It is possible that the gripping elements grip the film mechanically at corner areas. A mechanical gripping is in the context of the invention, a suction.

In a possible embodiment, in each case a transport conveyor is arranged on both sides of the transport plane. The respective trajectory is identical in an ideal embodiment. It is also ideal if the movement elements along the parallel movement paths, ie at least along the rear and a section of the return strand adjoining the first deflection region, rotate at the same speed with respect to the respective opposite movement element. Thus, the foil section can be guided at its corner regions by the arranged on the parallel and correspondingly rotating movement elements gripping elements. This makes sense, since so the gap in the transport plane is adapted only to the dimension of the film section, which is dimensioned so wide that it is tangible at the corner, wherein the gripping elements outside of the transport route could be passed to this. Another advantage is the fact that the transport can also be carried out safely, since the film can be transported in a tensioned state. Because the gripping elements are relative to each other and movable relative to the moving elements.

Figur 1

zeigt schematisch eine Gesamtanordnung in einer Seitenansicht,

Figur 2

zeigt eine alternative Ausführungsform zu Figur 1,

Figur 3

zeigt die Zuführung der Folie kurz vor dem Kontakt mit dem Gebinde nach Figur 2 und

Figur 4a und 4b

zeigen die Lage der Folie und des Gebindes unmittelbar nach dem Überfahren der Folie durch das Gebinde bei der Ausführungsform gem. Figur 2 in zwei Ansichten.

However, it is in any case ideal that, with the invention, a plurality of containers arranged one above the other can preferably be enveloped with a film section. Of course, individual containers can be wrapped, with several containers can enter the film wrapping module, which was previously not possible due to the predetermined, required division. A power supply of the gripping elements can be effected by means of energy supply along the movement path, wherein the movement elements have corresponding decrease elements. It is also possible if the moving element has an energy storage, which is to be recharged at times, which is why the optional lock can be provided for removal and infiltration. Thus, the system can continue to operate, although some movement elements are discharged for maintenance, inspection repair, or for recharging.

FIG. 1

shows schematically an overall arrangement in a side view,

FIG. 2

shows an alternative embodiment FIG. 1 .

FIG. 3

shows the feeding of the film shortly before contact with the container FIG. 2 and

FIGS. 4a and 4b

show the position of the film and the container immediately after passing the film through the container in the embodiment according to. FIG. 2 in two views.

The FIG. 1 shows a Folieneinschlagmodul with a wrapping unit 4 for container 1. This is arranged along a transport path or a transport unit 2, which consists of an inlet conveyor 2.1, a wrapping conveyor 2.2, one or more discharge conveyors 2.3. This is followed by a shrink tunnel 30. The film 3 or the film portion is coming from a supply and foil cutting unit 20 shown in dashed lines on wrapping unit 4 and provided. Between the inlet conveyor 2.1 and the wrapping conveyor 2.2 is a first feedthrough gap 9, through which the film 3 is guided in the transport plane and in front of the container to be wrapped 1 together with the required gripping and holding element. In the downward or return movement the gripping and holding element passes through the second feedthrough gap 10 at the end of the wrapping conveyor 2.2.

The wrapping unit 4 has a linear conveyor 5 with a closed trajectory 5.1, on which moving elements 6, also known as movers or rotors, which rotate in normal operation in a common direction B. The linear transporter 5 is only partially and very schematically indicated.

At the moving elements 6, at least one gripping element is arranged in each case according to the embodiment according to FIG. 1 a designed as a rod element guide rod 7 is on which the film 3 or the foil blank rests loosely. The linear transporter 5 is designed as an electromagnetic direct drive, so that the moving elements 6 can be controlled and moved independently of each other. The closed movement path 5.1 or the linear transporter 5 has a rear 5 a and a return strand 5 b, between which the deflection regions and return sections are arranged.

The guide rods 7, with their round, semicircular or polygonal cross-section, represent the gripping elements and extend transversely to the transport path of the container 1. As in FIG. 1 can be seen, are the three exemplified containers 1b, 1c and 1d in the region of the wrapping conveyor 2.2, after the implementation gap 9 and are all on the front end of the film 3.1, which are each comparable in size. The relative movement of the movement elements 6 and thus of the guide rod 7 to the respective container is ideally adapted, so that the rear end of the film 3.2 esp. Shortly before the end of the wrapping step always survives only as far as absolutely necessary that this is still held securely. In the downward movement, the moving element 6 moves past the foremost container 1d and releases the rear end of the film 3.2 so that this film end 3.2 can be overflowed by the container 1d.

As can further be seen, only a few movement elements 6 must be provided in the waiting position and passive return movement, since the movement elements 6 of the linear transporter 5 are freely accelerated and / or decelerated can be. In principle, a return movement is possible, but not useful in normal operation.

FIG. 2 is of the basic structure comparable to that of FIG. 1 , In this variant, however, movement elements 6 are used, in which the driven head 6.1 of the movement element 6 is connected via a coupling element with a guide rod 7. The head 6.1 comprises one or more own grippers, not shown, with which the film 3 or the film blank can be grasped at the front or at the front side. The rear end of the film lies loosely over the guide rod. 7

As in FIG. 3 to see the active guidance of the front end of the film 3.1 allows an absolutely safe and quasi arbitrary position for the moment of driving over with the container 1a, which is brought from the inlet conveyor 2.1. The release of the film from the grippers of the head 6.1 can thus take place simultaneously by the container 1a, the film 3 pulls out of the opening or just opened grippers.

Thus, the free, front end of the film can always be chosen so long that it rests securely on the rear of the wrapping conveyor 2.2 and does not reach the area of the front deflection and is guided under the transport plane. Thus, too, as in FIG. 4b shown, even with a wider implementation gap 9 avoids a fault. There, the discharge situation of the film 3 from the gripper of the head 6.1 is shown. Fig. 4a shows the same situation in a side view looking in the direction of transport. As a rule, it is sufficient that the driven head 6.1, the guide rod 7 and the coupling element 15 are provided only on one side. The coupling element 15 is articulated in a suitable manner, not shown, mounted on the head 6.1 and guided in the region of the linear transporter 5. The dash-dotted line indicates that a two-sided storage and / or motor drive depending on the desired power and load situation may be advantageous.

Because of the arbitrary degree of freedom in the control of the movement elements and thus the possibility quasi arbitrary relative speeds to adjust, it becomes possible to process a much wider range of product sizes with the same envelope unit in terms of external dimensions.

If a height adjustment or height change of the path is provided, this effect can be increased even more. In this case, it is useful to provide a vertical course of the movement path or the linear conveyor in the area of the lead-through gaps.

The device of the invention is part of a packaging machine, which may still have a shrink tunnel to shrink the film on the container. A component of the packaging machine upstream of the device according to the invention could be a stacking unit which places the containers one above the other.

LIST OF REFERENCE NUMBERS

1

Container (1a to 1e

2

transport means

2.1

infeed conveyor

2.2

wrapping conveyor

2.3

outfeed conveyor

3

Film / -zuschnitt

3.1

Foil end (front)

3.2

Foil end (rear)

4

wrapping unit

5

linear transporter

5.1

trajectory

5a

Hintrum

5b

return run

6

mover

6.1

Head of the movement element

7

guide rod

9

Implementing gap

10

Implementing gap

15

coupling element

20

Supply and foil cutting unit

30

shrink tunnel

Claims (13)

1. Device for wrapping containers (1) along a transport path, in particular a plurality of containers arranged one over the other, with a film (3) or a film segment, wherein the device comprises a wrapping unit (4) as a film wrapping module,
   characterised in that
   the wrapping unit comprises a linear drive (5) having a closed movement path (5.1), on which movement path movement elements (6) circulate in a common direction, wherein at least one gripping element is arranged on each respective movement element (6), and wherein the linear drive is configured as an electromagnetic direct drive.
2. Device according to claim 1, characterised in that the linear drive comprises a closed movement path, which in turn comprises an outgoing strand (5a) and a return strand (5b), between which are arranged deflection regions.
3. Device according to any one of the preceding claims, characterised in that the gripping elements are guide rods (7), which are configured as rod elements and extend at least along a part section of an outgoing strand (5a) of the movement path 5.1 transverse to the transport path.
4. Device according to any one of the preceding claims, characterised in that the gripping elements arranged on the movement elements are freely movable in relation to the linear drive, but also in relation to the movement element.
5. Device according to any one of the preceding claims, characterised in that a plurality of gripping elements are arranged at each respective movement element (6), which are controllable independently of one another.
6. Device according to any one of the preceding claims, characterised in that the movement elements (6) are individually controllable along the movement path (5.1).
7. Device according to any one of the preceding claims, characterised in that the linear drive with its movement path is arranged laterally to the transport path.
8. Device according to claim 2, characterised in that the movement path (5.1) of the linear drive (5) comprises a takeover section, which, rising from beneath a transport plane, transfers into an end section of an outgoing strand (5a), running parallel to the transport plane, wherein, connected to the said end section, is a deflection region, connected to which in turn is a descending movement section, which is guided from above the transport plane to beneath it and transfers into an end section of a return strand (5b), running parallel to the transport plane, to which a second deflection region connects, to which in turn the takeover section connects, which can have the same rising inclination as the rising section.
9. Device according to claim 2 or 8, characterised in that the linear drive (5) is adjustable in relation to its movement path (5.1) in respect of the distance interval between the outgoing strand (5a) and the return strand (5b).
10. Device according to any one of the preceding claims, characterised in that the movement element (6) comprises a driven head (6.1), a guide rod (7), and a coupling element connecting the head (6.1) and the guide rod (7).
11. Device according to any one of the preceding claims, characterised in that the linear drive (5) with its movement path (5.1) is adjustable in respect of the height above the transport plane, by raising and lowering of the entire movement path (5.1) of the linear drive (5).
12. Method for wrapping containers along a transport path, characterised in that a device is used according to any one of the preceding claims.
13. Method according to claim 12, characterised in that, in the region of a wrapping conveyor (2.2), simultaneously two or more containers (1 b, 1 c, 1 d) are in each case provided with a film segment, in continuous operation.

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