EP2349705A1

EP2349705A1 - Apparatus and method for producing bags from tubular pieces, which preferably comprise woven fabrics made of small stretched plastic tapes and are composed of two walls lying one on top of the other

Info

Publication number: EP2349705A1
Application number: EP09745052A
Authority: EP
Inventors: Christian HÄGER; Carsten Tausch; Klaus Ullmann
Original assignee: Windmoeller and Hoelscher KG
Current assignee: Windmoeller and Hoelscher KG
Priority date: 2008-11-14
Filing date: 2009-11-03
Publication date: 2011-08-03
Anticipated expiration: 2029-11-03
Also published as: CN102216066B; HUE028173T2; CN102216066A; WO2010054955A1; DE102008043758A1; EP2349705B1

Abstract

The invention relates to an apparatus (1) for producing bags from tubular pieces (13), which preferably comprise woven fabrics made of small stretched plastic tapes and are composed of two walls lying one on top of the other. Said apparatus comprises at least one transport device by means of which the tubular pieces (13) can be transported to the individual processing stations (8, 9, 10, 11) in a transport direction (x) that extends transversely to the extension direction (z) of the tubular pieces (13), at least one bottom opening station (8) by means of which open end sections can be produced at at least one end of a tubular piece (15, 15') by folding areas of at least one wall of the tubular piece about folded edges (36), and at least one closing station (10, 10') by means of which the open bottom squares can be laid and closed into bottoms by folding parts of the walls and/or tabs about further folded edges (36), and at least one embossing device by means of which at least one part of the later folded edges (36) can be embossed into the tubular pieces (13).

Description

Apparatus and method for producing sacks of pieces of hose, which preferably comprise woven fabric of stretched plastic tapes and consist of two superimposed walls

The invention relates to an apparatus and a method for producing sacks of pieces of hose, which preferably comprise woven fabric of stretched plastic tapes according to the preambles of claims 1 and 17.

Devices and methods for making sacks from pieces of tubing are known. In the present application, such hose pieces or sacks are considered, which comprise woven fabric stretched fabrics.

As a rule, the required material is provided in the form of a flattened fabric tube. In a separating device, which is often part of a device mentioned, are

Separation tools available with which individual pieces of hose are separated from the hose. These pieces of hose are now one

Transfer device passed with which the pieces of hose to the individual processing stations and processed there to bags. The processing into sacks consists essentially in the molding of

Floors, in which a valve is incorporated for later filling of the bag. The transport device can be in different

Subdivide sections, so that one could also speak of several transport facilities. The pieces of tubing are transverse to their

Extension direction (z) transported in a transport direction (x) and usually remain within one transport level. In this configuration, the individual processing stations can be arranged laterally on the transport device and in each case process one end of the hose section independently of the other end of the hose section. Nevertheless, both ends can be edited at the same time.

In a first processing station, the bottom opening station, an open bottom is formed on at least one end. For this purpose, the upper wall of the hose piece is folded back on itself about a folded edge, while the lower wall is after folding back into the transport plane of the hose piece. In the processing steps required for this purpose, so-called triangular pockets are formed laterally between the upper and lower walls. The aforementioned folded edge runs in a direction parallel to the transport direction. The now exposed walls of the hose piece are also referred to as tabs.

In a further processing station, the feeder station, areas of said flaps are folded along further folded edges which run parallel to the first folded edge, so that a closed bottom is formed. The soil is fixed in a suitable manner, for example by the already known for this purpose hot air welding. Here, the two tabs are often permanently connected to each other and / or with a ground cover sheet. Before laying a floor, a valve sheet can be inserted, which represents a valve for filling the bag after laying.

A particular problem arises when the components of the hose piece or tabs are folded around the different folding edges. In order to be able to accomplish in particular the opening of an end of the hose piece along a defined folded edge, is folded in known devices along edges such as rails or sheets. These edges should therefore define the folded edges. Since, however, the fabric material used, which often consists of stretched and woven plastic tapes and which then one or both sides has been coated, is quite rigid, it comes in folding or folding partly to the fact that the tube material, the rail or the sheet, which is or which is designed very thin, high. Therefore, in part, the wall to be folded is not folded along the desired folded edge. This is especially the case when the wall is folded back on itself, ie when the folding angle is 180 degrees. Therefore, the opened end portion of the tube piece is not processed correctly, so eventually it comes to unusable bags to be treated as broke. At least, however, the quality of such bags is considered inferior.

The object of the present invention is thus to improve a known device and a method such that the quality of the bags is improved, but at least the number of manufactured, useless bags is reduced.

The object is achieved by the characterizing features of claims 1 and 17. According to the characterizing part of claim 1, at least one embossing device is provided, with which at least a part of the later folding edges can be embossed into the tube pieces.

The embossing device thus leaves in the tubing an embossing line in which the restoring force is reduced. As a result, the material can be folded more easily and in particular controlled along the desired folding line. In contrast, the folding was relatively uncontrolled despite the rail or sheet metal edge, so that it often came to the errors described above. It should be noted in particular that the embossing or the embossing line takes place before folding around the fold edge defined by the embossing line. In contrast, in prior art devices, the folded edge in the material is not defined by the folding itself.

Described embossing devices may be provided at various positions in the device. So it may be helpful to provide such a stamping device before the Zulegestation. Is particularly advantageous to arrange at least one such embossing device in the direction of transport of the hose pieces in front of or in front of the bottom opening devices. This makes it possible to introduce imprints in the walls, before any folding occurs. At this point, all later required folding edges can be embossed, such as the folding edges, along which the laying of the soil takes place.

Particularly advantageous is a stamping device in a device in which the ends of the hose pieces are folded out of the transport plane before the actual bottom opening by means of Endabschnittumfalteinrichtung. Thus, guide plates can be provided, which are folded over these ends by a certain angle, for example 45 or 90 degrees. The actual bottom opening operation now takes place in the bottom opening station by returning the bottom wall back to the original level and continuing to unfold the top wall until it has been folded 180 degrees, i. H. folded back on itself. In such a device, the embossing device is particularly advantageously arranged between said end section folding device and the bottom opening station. Observations have shown that a folding of one end of a hose section by a maximum of 90 degrees does not cause any of the problems described, since the hose piece material is not yet heavily stressed. Only the further folding of the upper wall leads to the disadvantages mentioned, which is why the fold lines are embossed by means of the embossing device before further processing. In this way, it is especially possible to impress creasing lines in the hose piece without the hose piece slipping and thus causing new problems. This is often the case when the piece of tubing completely remains in the transport plane. This problem is to be seen above all in connection with the force-controlled embossing device described below.

In a first advantageous embodiment of the invention, the embossing device comprises at least two rotatable discs. A first disc carries in its outer peripheral surface a groove. This disc is therefore also referred to as grooved disc. In contrast, includes a second disc on her Outer circumferential surface a circumferential elevation. This second disc is also often referred to as a scoring disc. The two discs are arranged so that the elevation of the scoring disc engages in the groove of the grooved disc. The axes of rotation of the discs are advantageously arranged orthogonal to the transport direction of the tube pieces. Now, if the piece of tubing passes between the discs, the scoring disc presses the material into the groove, so that a folded edge is impressed. Particularly advantageously, the discs just described can be used if one end of the hose piece, as described, has already been folded over. Here, a folded edge is already approximately predetermined, which is finally determined by the discs. Sheaths are also advantageously used when the pieces of hose are transported through the entire device without stoppages, especially in a so-called continuous transport.

In this case, it is particularly advantageous if the axes of rotation with the plane which is spanned by the hose pieces, take an angle. This means that the axes of rotation do not run parallel to this plane. This angle is advantageously more than 0 degrees and less than 90 degrees. In particular, an angle between 30 and 60 degrees, preferably 45 degrees is provided. At the latter angle, the groove is introduced as evenly as possible in the material.

In a further advantageous embodiment of the invention, it is provided to act on at least one of the rotatable discs with a contact force caused by a force application device, which acts essentially in the radial direction of a further disc. The scoring through the discs is therefore force-controlled. Advantageously, the contact pressure is adjustable. Said force application device can be designed in different ways. This may for example comprise a compression spring. This could be adjustable with its end facing away from the disc in position, so that the contact force is finally adjustable. However, the use of a piston-cylinder unit that can be operated with compressed air is particularly advantageous. Instead of the compressed air, another fluid can be used. A further advantage is when the axis of rotation of the disc is rotatably mounted in a lever arm. For storage of the rotation axis, a known bearing can be used. The bearing remote from the end of said lever arm can with the machine frame or at one with the

Machine frame connected component connected. This with the

Machine frame connected component can also be movable relative to the frame, for example, be displaced. The lever arm can now be acted upon by said force application device with the mentioned contact force.

In a further, preferred embodiment of the invention it is provided that at least one of said disks is displaceable in a direction which comprises a component which extends orthogonal to the plane which is spanned by the hose pieces. For reasons of simpler construction, it is advantageous if the displacement direction extends along said orthogonal direction. Simply put, this is a height adjustment of the disc. This disc is preferably the scoring disc. Such a displacement possibility is provided to allow the processing of pieces of tubing with different thicknesses. In addition, can be done in this way a precise adjustment of the position of the folded edge. This is especially important if this disc occupies an angle with the plane that is spanned by the tube pieces. A displacement possibility could be realized in that the disc or its suspension is displaceable along rails and that a suitable adjustment means, for example a spindle, is provided.

It is also advantageous if at least one of the said disks is displaceable in a direction which comprises a component which extends parallel to the plane which is spanned by the hose pieces. Advantageously, this is the disc which is not displaced in a direction orthogonal to the plane of the tube pieces. Namely, if a first disc is adjustable in height, it may happen that the raised portion of the scoring disc is no longer completely in the groove of Grooved disc engages. Therefore, it is just advantageous to design a disk displaceable in the manner described. This disc is preferably the groove roller, which is preferably displaceable along a direction which is parallel to the hose piece axis.

In a further preferred embodiment of the invention it is provided that the at least two different materials, preferably made of two different steels are made. The scoring disc can be made of a hard steel, so that no significant wear occurs over a long period of operation. The grooved disc, however, can be made of a soft steel. By "softer steel" is meant a steel which is softer than the steel of the scoring disc, preferably considerably softer.The slotted disc can, in particular when it is suspended on a lever arm or a device of equivalent effect, be exchanged without much effort.

It is further preferred that the at least one second disc, the scoring disc, on its outer peripheral surface outside the circumferential elevation rings of elastic material, preferably Zellvulkolanringe includes. Thus, despite the force-controlled adjustment of the discs avoided that the material is damaged outside the fold edge. Furthermore, the inlet of the material in the gap between the two discs is better. In addition, the speed adjustment is better, which means that speed differences are compensated by the elastic material. Overall, a proper scoring or embossing is achieved by the use of the elastic material.

Another aspect of the invention relates to the drive device, which is advantageously provided and with which at least one disc can be driven. This drive device preferably comprises a drive and a torque transmission device, wherein the

Torque transmission device advantageously comprises a belt with a liner containing aramid fibers. Aramid is a sub-range of polymeric plastics, with "aramid" an abbreviation for aromatic Polyamides is. Certain aramids are known under the name "Kevlar." A belt is provided to ensure the above-described displaceability of the at least one disc, but on the other hand as rigid a drive as possible, so that the disc with its peripheral surface a desired peripheral speed A drive that is as rigid as possible under the described requirements can be realized particularly advantageously with straps comprising aramid fibers, since such straps do not show appreciable elongation The circumferential speed of the at least one disc can match the transport speed of the tube pieces If the speed does not coincide with the transport speed of the hose pieces, the choice of a suitable speed difference can be material-dependent, it is often advantageous if the peripheral speed of the at least one disk is greater it is considered to be the transport speed, in which case the tubing in the section where it is to be embossed is ideally smooth. The speed differences can be very small. Preferred is a relative to the transport speed by up to two percent different, in particular higher, peripheral speed of the disc. Particularly preferred is a peripheral speed which deviates by at most one percent, in particular by at most 0.5 percent, since here the folded edges are impressed optimally.

The peripheral speed is therefore advantageously adjustable via peripheral speed adjustment devices. For this purpose, a separate, adjustable in its drive speed drive or a transmission between the drive and disc can be provided. Also advantageous is a clamping device with which the belt tension is variable. This tensioning device may comprise a deflecting roller displaceable relative to the machine frame. Another possibility is the provision of an adjustable in diameter drive disk. Such a drive pulley is the so-called spreader, on the circumference of the drive belt runs. A spreader plate is usually infinitely adjustable in its outer periphery, so that the speed of the creasing or grooved disc as desired is adjustable. A spreader is well known, so that can be dispensed with a more detailed description at this point.

An embodiment of the invention is based on the subject description. The individual figures show:

1 is a schematic diagram of an apparatus for producing tissue sacks. FIG. 2 is a perspective view of a bottom opening station in a device according to the invention. 3 View III - III from FIG. 2 FIG. 4 View IV - IV from FIG. 3

FIG. 1 schematically shows individual steps for processing a fabric tube into sacks, as they take place in sack making device 1.

First, the fabric tube 2 is fed to the sack manufacturing device 1. This is advantageously done by unwinding a fabric tube forming a roll 3 in a unwinding device 4. Subsequently, the tube 2 experiences the so-called opening in the opening station 5. The fabric tube is guided around an inner tool which separates the two layers, so that the layers, if they were glued together in one of the manufacturing steps of the tube, separate. Only with separate layers can it be ensured that the following production steps can be carried out properly. Afterwards, the separate material layers of the hose are put back on top of each other.

The fabric tube is now fed to the cross-cutting device 6, which separates the fabric tube into individual pieces of hose.

Subsequently, a change of the original transport direction z, in which the hose or the hose pieces were transported in the direction of their longitudinal axes, takes place in the new transport direction x, so that the Hose pieces are no longer transported in the direction z of their hose longitudinal axis, but transversely thereto, so that the ends of the hose pieces are laterally accessible for the purpose of Anformung the floors.

In the following station, the bottom opening station 8, both ends of each tube piece are opened and the so-called bottom squares are laid. In the following valve station 9, a valve is placed and secured on one of the two open ends. The open bottoms are now closed in the bottom closing station 10, wherein two tabs are placed on each other and each other permanently, for example by welding, are connected. The conclusion of the actual Sackherstellprozesses forms the application of a ground cover sheet on the floors in the cover sheet station 11. For this purpose, the cover sheets can also be welded. The finished bags are then placed on the bag stack 12 and transported away from there on unspecified manner.

FIG. 2 shows details of a floor opening station 8 in a device according to the invention. The tube pieces 13 are transported flat by means of a transport device indicated in FIG. 3 in the direction x on the surface of a support 14, for example on the surface of a table, that is to say substantially horizontally. The transport preferably takes place at a uniform speed, ie in a continuous transport. In order to open one end 15 of the hose piece according to the invention, this end is first brought from the horizontal position to a vertical position. To allow this folding, the hose piece must be counteracted.

For this purpose, the hose piece 13 is threaded under a folding belt 16. This folding tape can be relative to the hose pieces in peace and thus relative to the support in motion. However, the hose pieces can also move relative to the folding belt 16. This is the case, for example, when the seam is at rest. The rebate belt may consist of a flexible, but highly prestressed material. Preferably, however, these consist of steel sheets, which in a manner not shown with the support 14th or connected to the machine frame. Steel sheets have the advantage over other components of a smaller thickness with the same load capacity. If the hose piece 13 is threaded, it is then guided past a guide element 17, for example a baffle.

After the end 15 of the tube piece 13 has been brought into the vertical position, this comes to the actual bottom opening device 18, which is shown only schematically in this figure. On the way to the bottom opening station, the end 15 of the tube piece 13 is guided by one or more guide elements 25 (see FIG. 3), so that despite the inclination of the ends 15 to fold back into the starting plane, the ends are durable in the vertical direction. In front of the bottom opening device 18 and preferably in the region of the guide elements 25, an embossing device 26 is provided which will be explained in more detail with reference to FIGS. 3 and 4.

In the bottom opening device 18, two suction bars are provided, which engage on both sides of the folded-up end and are guided in or against the direction z, so that the material layers are separated from each other. The interior of the end 15 of the tube piece 13 is now accessible. Spreading elements now engage in this interior, which push the material layers further apart until they are horizontal again. This situation is illustrated by the open bottom 19.

The opening of the second end 15 'of the tube piece 13 takes place in the same way, but offset from the opening of the first end 15. The first end is already opened in the bottom opening device 18, while the second end 15' is guided under the folding band 16 '. By means of the guide element 17 'and the bottom opening device 18', the open bottom 19 'is generated in the manner described above. Before the tube piece 13 reaches the second bottom opening device 18 ', it passes through the embossing device 26'. An offset arrangement of the components is advantageous when bags are to be produced with very small floor center distances A. In this case, the embossing means 26, 26 'may be arranged offset from one another. A possible arrangement would be that the (second) embossing device 26 'is arranged opposite the (first) bottom opening device 18. In order to allow the embossing device 26 to act on the already formed folded edge, a recess 27 is provided in the support 14 through which a disk of the embossing device 26 engages. A disc of the embossing device 26 'engages by a further, not visible in Figure 2 recess in the support 14. Similarly, the folding bands 16, 16' are provided with recesses, of which in Figure 2, only the recess in the folding belt sixteenth 'can be seen to allow a disk to act on the tubing.

When leaving the bottom opening station 8, the piece of tubing with open bottoms 19, 19 'is present, wherein all components of the opened bottoms are located substantially in the plane of the support 14.

A particular aspect of the bottom opening station 8 is the fact that each bottom opening device 18, 18 'is supplied with torque by its own drive. This is illustrated by the motor 22 on the bottom opening device 18. The corresponding motor on the bottom opening device 18 'is not visible in the illustrated view. The motor of a bottom opening device 18, 18 'primarily supplies the suction bars with a drive torque, so that they can move the material layers away from one another. Also, the spreading elements are powered by this engine with torque.

The conclusion of the bottom opening devices 18, 18 'form the pressure rollers 23, 23', which serve the purpose of compressing the freshly opened soils and thus to fix in their position. The resulting in the context of the bottom opening creases are struck out and then form correct folding edges, so that the tendency of the soil decreases, straighten up again. As a counter-pressure element to the pressure rollers 23, 23 'serve either the support 14 or the counter-pressure rollers 24, 24'. The pressure rollers 23, 23 'are arranged in the transport direction x seen in Figure 2 at the same height. These rollers 23, 23 'can also be offset be arranged to each other, so that the open floors can be pressed immediately after the opening process in the manner described.

FIG. 3 shows the view III-III from FIG. 2, wherein in this view further details of the embossing device 26 'are shown. Although in the

Below the embossing device 26 'is described, the written applies analogously to the embossing device 26. Within the embossing device 26' is the

Hose section 13 by means of the transport elements 27 and 28, which may be configured for example as a per se known double belt conveyor, transported in the transport direction x. The end 15 'of the tube piece has already, as described above, folded into the vertical and in this

Position guided by the guide elements 25.

The embossing device 26 'basically comprises a first disc 30 and a second disc 31. The disc 30 is freely rotatable with its shaft 34 in one

Support arm 32 mounted, wherein the support arm is again in a manner not shown in communication with the machine frame. However, this connection may also include a displacement device, so that the disc 30 along the double arrow V in the direction orthogonal to the tube piece 13 is displaceable. The plane spanned by the end face 33 closes with the plane which is spanned by the hose piece 13, an angle α, which is 45 degrees in the present example. In general, this angle α advantageously corresponds to the bisector of the angle between the tube piece 13 and its end 15 '. Also, the second disc 31 occupies this angle α.

The first disc 30 is designed as a scoring disc, which means that it carries on its outer peripheral surface a circumferential elevation 35. This circumferential increase 35 engages exactly in the already predefined fold edge 36 between the hose piece 13 and the end 15 'a. On both sides of the circumferential increase a ring 37 is provided made of an elastic material, for example Zellvulkolan. To some extent, this material may be in contact with the material of the piece of tubing Fall back, so that damage to the hose piece can be avoided.

The second disc 31 is rotatably mounted with its shaft 38 in a lever arm shown in Figure 4. The lever arm 43 is displaceable relative to the machine frame and also relative to the support surface in the direction of the double arrow H by a displacement device, not shown in more detail, so that the disk 31 can be adapted in its positioning to the first disk 30. The second disc 31 is designed as a grooved disc, d. h., It carries on its outer circumference a circumferential recess (groove) 39, in which the peripheral elevation 35 of the scoring disc can engage, or in which the grooved piece of hose piece material can be pressed. In this way, therefore, the already slightly pre-embossed folded edge 36 is further reinforced, so that in the bottom opening device, which is the embossing means 26 'downstream, the upper layer of the end 15' of the hose piece 13 can be easily folded over.

On the shaft 38, a pulley 40 is attached to the second disc 31 facing away from the end, via which the second disc can be supplied with a drive torque. The pulley 40 in turn is driven by a belt 41 that can be driven by its own drive motor, such as an electric motor. The belt 41 can also be driven by a drive, which also drives the two transport elements 27 and 28, so that at speed changes of the transport and the embossing means 26 'runs at a different speed in order to avoid damage to the hose pieces 13.

FIG. 4 shows a side view of the embossing device 26 '. For a better understanding, it is assumed that this view corresponds to the section IV-IV shown in FIG. In addition to the elements shown in FIG. 3, FIG. 4 shows above all that the second disc 31 is rotatably mounted in the lever arm 42, which is rotatably mounted with its one end 43 in a bearing component 44 connected to the machine frame. The lever arm is thus pivotally mounted about the arrow 45. When Swivel drive is a piston-cylinder unit 46 is provided, the lever arm 42 remote from the end of the machine frame is rotatably mounted. The piston rod 47 of the piston-cylinder unit 46 is in turn pivotally connected to the lever arm 42. For the operation of the embossing device 26 'is now the piston-cylinder unit 46 is acted upon by a pressurized fluid, so that ultimately the disc 31 is pressed with a substantially constant contact force against the first disc 30 and against the tube piece 13 to a sufficient grooving to ensure.

In addition, further elements of the drive of the second disc 31 can be seen in FIG. It is a drive 48, the drive wheel 49 is wrapped by the transport element 28 to a part. Another drive wheel 50 is looped by the belt 41. Both drive wheels are driven by the rotor of the drive 48, so they always have the same angular velocity.

In the figure 4 it is shown that the second disc 31 is driven. However, it is conceivable that instead or in addition, the first disc 30 is drivable.

Claims

claims

1. Device (1) for the production of sacks of hose pieces (13), which preferably comprise woven fabric of stretched plastic tapes and consist of two superimposed walls, wherein at least the following means are provided:

- At least one transport device, with which the hose pieces (13) in a transport direction (x) which extends transversely to the extension direction (z) of the hose pieces (13), to the individual processing stations (8, 9, 10, 11) is transportable,

- At least one bottom opening station (8), with which by folding over areas of at least one wall of the hose piece about folding edges (36) at at least one end of a hose piece (15, 15 ') open end portions can be generated, and

- At least one Zulegestation (10, 10 '), with which by folding parts of the walls and / or tabs to further folding edges (36), the open bottom squares are added to floors, characterized by at least one embossing device, with which at least a part of the later

Folding edges (36) in the hose pieces (13) can be embossed.

2. Apparatus according to claim 1, characterized in that the embossing device in the transport direction (x) of the hose pieces (13) in front of the at least one bottom opening station (8) is arranged.

3. Device according to one of the preceding claims, characterized

- That at least one Umklappeinrichtung is provided, with which at least one end portion (15, 15 ') of the hose piece along a fold line (16) from the original level, which is spanned by the hose piece (13) is folded into a second plane, wherein the folding device is arranged upstream of the at least one bottom opening station (8), and

- That the embossing device between the folding device and the bottom opening station (8) is arranged.

4. Device according to one of the preceding claims, characterized in that the embossing device comprises at least two rotatable discs (30, 31), of which a first disc (30) in its outer peripheral surface a groove (39) and a second disc (31) its outer circumferential surface comprises a peripheral elevation (35), wherein the hose piece (13) between the two discs (30, 31) is feasible.

5. Device according to the preceding claim, characterized in that the axes of rotation of the at least two rotatable discs (30, 31) form an angle (α) with the plane which is spanned by the hose pieces.

6. Device according to the preceding claim, characterized in that the angle (α) is between 0 and 90 degrees, in particular between 30 and 60 degrees and preferably 45 degrees.

7. Device according to one of the three preceding claims, characterized in that at least one of the rotatable discs (30, 31) can be acted upon by a force application device caused by a pressing force, which acts substantially in the radial direction of another disc.

8. Device according to one of the four preceding claims, characterized in that the axis of rotation of at least one disc (30, 31) is mounted in a lever arm (42), wherein the lever arm (42) can be acted upon by a force applying device with a force.

9. Device according to one of the five preceding claims, characterized in that one of said discs (30, 31) in a direction (y) is displaceable, comprising a component which is orthogonal to the plane through which the hose pieces (13) spanned becomes, runs.

10. Device according to one of the six preceding claims, characterized in that one of said discs (30, 31) in a direction (x, z) is displaceable, comprising a component which is parallel to the plane which is spanned by the tube pieces , runs.

11. Device according to one of the seven preceding claims, characterized in that the at least two discs (30, 31) are made of different materials.

12. Device according to one of the eight preceding claims, characterized in that

Discs are arranged on the outer circumference of a second Zellvulkolanringe.

13. Device according to one of the nine preceding claims, characterized in that at least one of the discs is drivable by means of a drive device.

14. Device according to the preceding claim, characterized in that the drive device comprises a drive and a torque transmission device.

15. Device according to the preceding claim, characterized in that the torque transmission device comprises a belt with an insert, the aramid fibers.

16. Device according to one of the preceding claims, characterized in that the at least one disc can be driven at a peripheral speed, the larger, preferably slightly larger, than the transport speed of the hose pieces.

17. A method for producing sacks of hose pieces, which preferably comprise woven fabric of stretched plastic tape and consist of two superimposed walls, wherein at least the following steps are provided:

- Transport of the hose pieces (13) in a transport direction (x) which extends transversely to the extension direction (z) of the hose pieces (13) by means of a transport device to the individual processing stations (8, 9, 10, 11),

- Producing open end portions (15, 15 ') by folding over areas of at least one wall of the hose piece (13) about folding edges on at least one end of a hose piece (13) by means of a bottom opening station (8), and

- Laying the open bottom squares to soils by means of a Zulegestation by moving parts of the walls and / or tabs for more Folded edges (36), characterized in that at least a part of the later folding edges (16) are embossed into the tube pieces (13).

18. Method according to the preceding claim, characterized in that

- That first by means of a folding device at least one end portion (15, 15 ') of the hose piece along a folding line (35) from the original plane, which is spanned by the hose piece (13) is folded into a second plane, wherein the folding before the Opening the floor is done, and

- That the stamping of the later folding edges after folding and before opening the soil takes place.