DE102018110762A1 - Production of strands of the tobacco processing industry, in particular of hollow strands - Google Patents

Abstract

The invention is a device for producing a first and a second strand (20, 21) of the tobacco-processing industry, wherein the strands (20, 21) in each case at least two layers of a wound sheet material (1a, 1b, 8a, 8b), in particular a material withdrawn from at least one bobbin-type device (1, 8), wherein in a first mode of operation of the device, the sheet material (1a, 1b) for the first strand (20) is removable from a first bobbin device (1) and via a first bobbin device (1) Material run to a first strand forming device (14) is conveyed and the sheet material (8a, 8b) for the second strand (21) from a second Bobinenvorrichtung (8) is removable and via a second material run to a second strand forming device (7) is conveyed, wherein, in a second mode of operation of the device, the sheet material (1a, 8a) for the first strand (20) consists of the first and the second bobbin device (1, 8) is removable and via a third material run to the first strand forming device (14) can be conveyed and the sheet material (1b, 8b) for the second strand (21) from the first and the second Bobinenvorrichtung (1, 8) is removable and via a fourth material run to the second strand forming device (7) is conveyed.

Description

The invention relates to a device for producing a first and a second strand of the tobacco-processing industry, wherein the strands each have at least two layers of a wound sheet material. The invention further relates to the use of such a device.

In the prior art there are devices for the production of two strands of the tobacco processing industry, in which the strands have a double-layered wrapping material or hollow strands are made of double-layered material. Here, the strip of material and the relative positioning to each other and to a formatting device in which the strand is formed or formed, important.

For example, from the EP 2 574 244 B1 a device known in the band or strip-shaped material, here paper, is unwound from a reel. In a manufacturing machine, the paper is wrapped around a tobacco or filter rod and glued. In this document, a device is shown in which the paper is fed into two double-width paper strips, cut into two parallel strands, superimposed and then fed one above the other to a subsequent production machine. Here, the wrapping material runs in different material runs.

Heretofore, such devices have been designed to produce a particular type of strand, i. that the wrapping material is the same. In particular, in the production of hollow strands of double-layered material, known devices are relatively inflexible in the change of the material layers, in particular when the layers of the wrapping material strips or the hollow strands are to be varied.

It is an object of the present invention to provide a variable device for producing a first and a second strand of the tobacco processing industry, with different strands can be produced with only a very few conversion measures.

This object is achieved by a device for producing a first and a second strand of the tobacco-processing industry, wherein the strands each have at least two layers of a wound sheet material, in particular a withdrawn from at least one bobbin device material, wherein in a first mode of operation of the device the sheet material for the first strand is removable from a first bobbin device and can be conveyed to a first strand forming device via a first material run and the flat material for the second strand is removable from a second bobbin device and can be conveyed to a second strand forming device via a second material run, wherein in a second mode of operation of the device, the sheet material for the first strand of the first and the second bobbin device is removable and via a third material run to the first strand forming device f is rderbar and the sheet material for the second strand from the first and second Bobinenvorrichtung is removable and can be conveyed via a fourth material travel to the second rope-forming device.

By providing different material runs in the two operating modes, a very efficient change of the layers in the produced strands with little conversion time is possible.

If preferably in the second mode of operation, the third and fourth material run at least partially intersect in the operation of the device, different operating modes can be realized with few structural parts. In particular, the first and second material runs preferably do not intersect in the first operating mode. In particular, a crossing of the third and fourth material run is to be understood as meaning that the sheet material located in the material run, or a part thereof, intersects, in particular at a distance from one another.

Preferably, when the first strand forming device is associated with a first pivotable guide device which guides the sheet material in the first mode in the first material run and in the second mode in the third material run, wherein a change of a pivot angle of the guide device rotation of the means of the first strand forming device formed strand around its longitudinal axis, a very efficient guidance of the sheet material in the first material run and the third material run is possible. In addition, the same guide device can be used for both modes, so that the expenditure on equipment is minimized.

The pivotable guide device, which is preferably arranged on a pivot plate guide device is, for example, in the EP 3 056 097 A1 the applicant discloses. This serves, in particular, to precisely adjust the position of the guided material web. Corresponding sensors, which sense the position of the edges of the material web, are preferably provided for this purpose.

Preferably, the second strand-forming device is associated with a second pivotable guide device, which the flat Material in the first mode leads in the second material run and leads in the second mode in the fourth material run, wherein a change in a pivot angle of the guide device causes rotation of the strand formed by the second strand forming device about its longitudinal axis. The second pivotable guide device can thus also be used in both modes, which minimizes the expenditure on equipment of the device according to the invention. Also, the second pivotable guide device is preferably a guide device which is arranged on a second pivot plate and a in EP 3 056 097 A1 corresponds to described guide device.

Preferably, the first guide device is arranged horizontally offset from the second guide device, wherein in particular the first guide device is arranged vertically offset from the second guide device. This ensures that a corresponding efficient position control of the material strips is made possible both for a first strand and for a second strand. Preferably, in this case, the first guide device and the second guide device are pivotable independently of each other, so that for each strand produced independent controllability or controllability of the position of the material webs is possible.

If a first material-cutting device is provided downstream of the first bobbin device, and a second material-cutting device is formed downstream of the second bobbin device, wherein the material-cutting devices are designed to pull the planar material out of the respective bobbin devices and to cut the planar material longitudinally in two paths, with two bobbin devices each having a bobbin, very efficiently two two-ply strands are produced. A material cutting device has the function of withdrawing a material, for example a wrapping material or a paper web, from a bobbin device and cutting this material centrally or substantially in the middle in the longitudinal direction to produce two material webs, which then serve to form a strand of the To envelop tobacco processing industry or alternatively to be formed into a hollow strand. If, for example, a bobbin-type device has two bobbins which already have a corresponding width of the material needed for further processing, the material-cutting device can also be designed as a material-pulling device. In this case, therefore, the cutting function can be omitted. In the context of the invention, the term "Materialzugschneidvorrichtung" thus also includes a Materialzugvorrichtung. Furthermore, in the context of the invention, a bobbin device can accommodate both one and two bobbins, from which then material is / are removed.

When cutting the material that has been peeled off from the reel, a central cut can be made, for example when the cut material webs are to form the same layer in the strands formed, for example the outer layer or the inner layer. If the material of only one strand is cut from a material web that is pulled off a reel, it makes sense not to set the cut completely in the middle, but so that the outer web or the web from which the outer layer of the Stangs is formed, has a slightly larger width than the inner track of the strand or the web, from which the inner layer of the strand is formed.

Preferably, in the first mode of operation, when the first material-cutting device is provided in the first material run, the device is configured to form an outer and an inner layer for the first strand from the sheet material cut into two webs by the first material-cutting device, in particular one Control device is provided, by means of which a tension of the two webs between the first Materialzugschneidvorrichtung and the first strand forming device is controlled together, in particular to an equal value, a particularly efficient operation of the device is possible. In this case, the control device can, for example, have a so-called dancer, around which the cut sheet material is deflected or around which this material runs, wherein a corresponding tension of the material webs between the first material cutting device and the first strand forming device can be set by the dancer or the control device.

A further particularly efficient operation is given when, in the first operating mode, the second material-cutting device is provided in the second material run, wherein the device is designed to make an outer and an inner layer for the second cut from the second material-cutting device in two webs Strand to form, in particular, a control device is provided by means of a Tensile stress of the two webs between the second Materialzugschneidvorrichtung and the second strand forming device together, in particular to an equal value, is controlled.

Again, the control device preferably comprises a so-called dancer, around which the webs are directed and which serves to control a tension of the two webs between the second material-cutting device and the second strand-forming device.

It is preferably provided that in the second mode of operation, the webs which are cut from the first material-cutting device of sheet material are conveyed in the third and fourth material run so that they serve as outer layers of the first and second strand, wherein in particular in first pivotable guide device which are deflected one track and in the second pivotable guide device, the other track.

If a control device is preferably provided which controls the tension of the two webs which can be conveyed in the third and fourth material run and in particular serve as outer layers of the first and second strand, separated from each other, in particular temporarily with different values, can be very efficient operated in the second mode of operation, the device. In particular, the outer layers of the first and second strand come into contact with a respective one of the format strip of the first and the second strand forming device, so that over the control of the tension of the two webs forming the outer layers in the strand, also very specifically the strand conveying speed of the strand forming device can be adjusted.

Preferably, the webs which are cut in the second mode by the second Materialzugschneidvorrichtung of sheet material, in the third and fourth material run conveyed so that they rest directly on the size bands of the first strand forming device and the second strand forming device, in particular in the first pivotable Guide device which a track and in the second pivotable guide device, the other track are deflected.

When a control device is preferably provided, by means of which the tension of the two webs serving as inner layers of the first and second strand, between the second Materialzugschneidvorrichtung and the first and the second strand forming device together, in particular to an equal value, can be controlled The device can also be operated very efficiently and with few mechanical components.

Preferably, only one spreading device is provided upstream of the first strand forming device and the second strand forming device, by means of which in each material run a web of the cut sheet material is displaceable in a plane of the respective web transversely to the conveying direction of the web, so that an overlapping connection in each case an outer web with an inner track is possible. Under the overlapping connection of the webs is to be understood in the context of the invention in particular that the webs overlap so that they are wound in the strand as an outer layer to an inner layer, the outer layer and the inner layer by previous overlap forming this layer Webs are glued together. As a result, with very few components of the device, an efficient overlapping of the respective webs with each other and a corresponding efficient gluing of the webs to double webs or to double layers can be provided.

The object is further achieved by the use of a device according to the invention or preferably designed for producing double-layered hollow strands, in particular paper hollow tubes, of the tobacco-processing industry.

Preferably, the two layers of the hollow strands are made of the same material.

Further preferably, the two layers of the hollow strands of different material, in particular the outer layers of the two hollow strands are made of the same material. In this case, then the inner layers of the two hollow strands of another, but also the same, be material in comparison to the outer layers.

Preferably, the first material run of the invention in the conveying direction of the material web has the following device features: first bobbin device, first material cutting device, control device to adjust the tension of the cut two webs, a region in which one cut web is conveyed and the other cut web by means a spreading device in the web plane is moved transversely to the conveying direction, a first pivotable guide device and a first strand forming device.

Accordingly, the second material run preferably comprises the following components: second bobbin device, second material cutting device, control device for adjusting the tension of the cut two webs, a region in which the one cut web is conveyed and the other cut web by means of a spreading device in the web plane is moved transversely to the conveying direction, a second pivotable guide device and a second strand forming device.

• - für die äußere Bahn des ersten zu bildenden Strangs: eine erste Bobinenvorrichtung, eine erste Materialzugschneidvorrichtung, eine erste Steuervorrichtung zur Einstellung der Zugspannung dieser Bahn, ein Lauf der Bahn über eine erste Schwenkvorrichtung zu der ersten Strangformungsvorrichtung,
• - für die innere Bahn des ersten zu bildenden Strangs: eine zweite Bobinenvorrichtung, eine zweite Materialzugschneidvorrichtung, eine zweite Steuervorrichtung zur Steuerung der Zugspannung der zweiten Bahn, eine Spreizvorrichtung, die dafür sorgt, dass die Bahn in der Bahnebene quer zur Förderrichtung in einem Überlapp zur äußeren Bahn gebracht wird, und die erste Schwenkvorrichtung sowie die erste Strangformungsvorrichtung.

The third material run preferably comprises the following components of the device:

• for the outer web of the first strand to be formed: a first bobbin-winding device, a first material-cutting device, a first control device for adjusting the tension of this web, a run of the web via a first pivoting device to the first strand-forming device,
• for the inner web of the first strand to be formed: a second bobbin device, a second material cutting device, a second control device for controlling the tension of the second web, a spreading device which ensures that the web in the web plane transversely to the conveying direction in an overlap with outer web, and the first pivoting device and the first strand forming device.

• - für die äußere Bahn: die erste Bobinenvorrichtung, die erste Materialzugschneidvorrichtung, eine weitere Steuervorrichtung zum Einstellen der Zugspannung zwischen der ersten Materialzugschneidvorrichtung und der zweiten Strangformungsvorrichtung, wobei diese Steuervorrichtung unabhängig ist von der Steuervorrichtung der äußeren Bahn des dritten Materiallaufs, eine Spreizvorrichtung, die dafür sorgt, dass diese äußere Bahn mit der inneren Bahn in Überlapp gebracht werden kann, eine zweite Schwenkvorrichtung sowie die zweite Strangformungsvorrichtung,
• - für die innere Bahn: die zweite Bobinenvorrichtung, die zweite Materialzugschneidvorrichtung, eine Steuervorrichtung, die der Steuervorrichtung aus dem dritten Materiallauf für die innere Bahn entspricht, eine weitere Förderung zu der zweiten Schwenkvorrichtung und die zweite Strangformu ngsvorrichtung.

The fourth material run comprises the following components of the device:

• for the outer web: the first bobbin device, the first material cutting device, a further control device for adjusting the tension between the first material cutting device and the second strand forming device, this control device being independent of the outer material control device of the third material run, a spreading device therefor ensures that this outer web can be overlapped with the inner web, a second pivoting device and the second strand forming device,
• for the inner web: the second bobbin device, the second material cutting device, a control device corresponding to the control device of the third material run for the inner web, a further conveying to the second pivoting device and the second strand forming device.

On the pivoting device or elsewhere, a Beleimvorrichtung may be provided in each case to provide a glue on the inner surface of the respective outer material web, so that the outer and the inner material web of a strand together when they are placed on one another, can be glued. This makes it possible that in the strand forming not only the outer web or the outer material or the outer layer is formed, but that the inner material web or layer is formed with.

Further features of the invention will become apparent from the description of embodiments according to the invention together with the claims and the accompanying drawings. Embodiments of the invention may satisfy individual features or a combination of several features.

• 1 eine schematische Ansicht einer erfindungsgemäßen Maschine, die gemäß der ersten Betriebsart betrieben wird,
• 2 eine schematische dreidimensionale Darstellung von zwei Materialbahnen,
• 3 eine schematische Darstellung von zwei Strangformungsvorrichtungen mit entsprechend gebildeten Strängen, die gemäß der ersten Betriebsart hergestellt wurden,
• 4 eine schematische Darstellung der erfindungsgemäßen Maschine in der zweiten Betriebsart,
• 5 eine schematische dreidimensionale Darstellung der Materialbahnen und
• 6 eine schematische Darstellung der Strangformungsvorrichtung mit entsprechend gebildeten Strängen nach der zweiten Betriebsart.

The invention will be described below without limiting the general inventive idea by means of embodiments with reference to the drawings, reference being expressly made to the drawings with respect to all in the text unspecified details of the invention. Show it:

• 1 a schematic view of a machine according to the invention, which is operated according to the first mode,
• 2 a schematic three-dimensional representation of two material webs,
• 3 a schematic representation of two strand forming devices with correspondingly formed strands, which were produced according to the first mode,
• 4 a schematic representation of the machine according to the invention in the second mode,
• 5 a schematic three-dimensional representation of the webs and
• 6 a schematic representation of the strand forming device with correspondingly formed strands after the second mode.

In the drawings, the same or similar elements and / or parts are provided with the same reference numerals, so that apart from a new idea each.

1 shows a schematic representation of a device according to the invention in a first mode. Here, a first material run and a second material run are shown. The first material run contains the material, for example a paper web, that comes from a reel 1 mounted on a first bobbin device to a front strand forming device 14 to be led. The term "front or back" is in relation to the 1 meant in relation to the drawing plane.

Here is the first bobbin 1 closer to the viewer 1 be arranged as the second bobbin 8th , This is in 2 again shown schematically. The first bobbin 1 lies in the viewing direction before the second reel 8th , Accordingly, the first strand forming device 14 comprising the front format tape 14a in front of the second strand forming device 7 comprising the rear format tape 7a arranged. This is to be explained schematically by the three-dimensional representations of the 2 and 3 be explained.

The first material run is thus in the viewing direction before the second material run in 1 arranged. Accordingly, the first shown there swivel plate 6 in the viewing direction in front of the second pivot plate 13 arranged, ie spaced horizontally from each other. Thus, a supply of the material webs to the first strand-forming device and the second strand-forming device is much more efficient and easier.

In the first material run is by a Bobinenvorrichtung or first Bobine 1 a paper web having substantially twice the useful width of a material-cutting device 3 withdrawn, via a role without reference. The material cutter 3 pulls the material off the bobbin 1 from and cuts the peeled material web in two lanes 1a . 1b as shown schematically in 2 is shown. These two tracks 1a . 1b become a dancer together 2 led and further promoted by other roles on their funding. This happens in the embodiment of 2 after two rollers in the conveying direction behind the dancer 2 , The dancer 2 is part of a control device that ensures that the tension of the paper webs 1a . 1b can be set or controlled to a predetermined or a predetermined value.

The paper web 1a which forms the outer web in the formed strand, then passes to a first pivot plate 6 , On this swing plate 6 is by means of a glue application device 5 Glue applied.

The paper web 1b arrives at a spreading device 4 , which is formed, the position of the paper web 1b in viewing direction of 1 the location of the paper web 1a so that they almost completely overlap. Then the paper web arrives 1b over other roles also to the first swivel plate 6 and from there both paper webs arrive 1a . 1b each have a role in the strand forming device 14 which may be a common format device and, for example, a format tape 14a having. In the format device, the two paper webs 1a . 1b formed into a hollow strand. This can then be cut to length in hollow tubes.

The second material run is the lower one in this case. This is arranged symmetrically to the first material run. It is done by means of a Materialzugschneidvorrichtung 9 deducted a sheet material, and deducted over a roller deducted to this sheet material in two paper webs 8a . 8b to cut. The paper web 8a serves to form the outer paper web or paper layer in the second strand forming device, and the paper web 8b to, in the second strand forming device 7 to form the inner paper web or paper layer.

The two paper webs 8a . 8b become a dancer together 10 guided.

The inner paper web 8b then passes through some rollers to the second pivot plate 13 and from there via a corresponding role to the second strand forming device 7 ,

The outer paper web 8a passes over some rollers to a spreading device 11 that like the spreader 4 acts, and from there via rollers to the second pivoting device 13 on which a glue passes through a glue application device 12 is applied, so that the paper webs 8a . 8b can be glued together.

It forms two strands 20 . 21 which have an outer and an inner layer made of the same material. The material of the respective bobbins can be different here but also be the same. It can thus be formed two equal strands or two strands of two different materials. With the pivoting of the swivel plates 6 . 13 The seams of the strands formed can be changed in the direction of rotation of the strands.

The second mode of operation of the device according to the invention is in the 4 to 6 shown schematically. In contrast to the first operating mode, in the second operating mode, the material or the paper webs 1a . 1b that of the first bobbin device 1 be deducted by the first Materialzugschneidvorrichtung 3 deducted accordingly and in the paper webs 1a . 1b and then conveyed as outer paper webs to form the front and back strand in the first and second strand forming apparatus in the third material run and the fourth material run.

Here comes the paper web 1a over the first pivot plate 6 and the gluing device 5 to the first strand forming device 14 and the second paper web 1b over the spreading device 4 and the second pivot plate 13 to the second strand forming device 7 , The inner paper webs are by the second reel 8th withdrawn sheet material which is peeled off by the second material-cutting device and correspondingly in the paper webs 8a . 8b is cut, also on the third and fourth material run to the two strand forming devices 14 . 7 promoted. The paper web 8a passes over the spreading device 11 to the first pivot plate 6 and from there into the first strand forming device 14 , The second paper web 8b passes over the second pivoting device 13 to the second strand forming device 7 ,

The tensile stresses of the paper webs are controlled or regulated as follows. The two paper webs 8a . 8b be about the dancer 10 controlled or adjusted. The tension of the paper web 1a is about the dancer 2 controlled and the paper web 1b is about the dancer 15 set or controlled.

There are then two strands 20 . 21 , the outside paper webs from the bobbin 1 or Bobinenvorrichtung 1 have and inside paper webs from the bobbin 8th or Bobinenvorrichtung 8th , This is in 6 clearly visible.

To change from the first mode to the second mode, or vice versa, only the paper webs 1b and 8a be changed in their position. The paper web 1b must be around the dancer 15 be laid and placed around rollers so that this web engages the second pivot plate 13 arrives. The paper web 8a must be from the first mode to the second mode behind the spreader 11 so be placed around rolls that the paper web 8a with the first pivoting device 6 comes into operative connection. Thus, a very simple changeover from a first operating mode to a second operating mode and vice versa is possible.

All mentioned features, including the drawings alone to be taken as well as individual features that are disclosed in combination with other features are considered alone and in combination as essential to the invention. Embodiments of the invention may be accomplished by individual features or a combination of several features. In the context of the invention, features which are identified by "particular" or "preferably" are to be understood as optional features.

LIST OF REFERENCE NUMBERS

1

first bobbin

1a

paper web

1b

paper web

2

dancer

3

Materialzugschneidvorrichtung

4

spreading

5

glue application

6

first pivot plate

7

second strand forming device

7a

rear format tape

8th

second bobbin

8a

paper web

8b

paper web

9

Materialzugschneidvorrichtung

10

dancer

11

spreading

12

glue

13

second pivot plate

14

first strand forming device

14a

front format tape

15

dancer

20

strand

21

strand

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

• EP 2574244 B1 [0003]
• EP 3056097 A1 [0010, 0011]

Claims (17)

Device for producing a first and a second strand (20, 21) of the tobacco-processing industry, wherein the strands (20, 21) each comprise at least two layers of a wound sheet material (1a, 1b, 8a, 8b), in particular one of at least one Bobinenvorrichtung (1, 8) of withdrawn material, wherein in a first mode of operation of the device, the sheet material (1a, 1b) for the first strand (20) from a first Bobinenvorrichtung (1) is removable and a first material run to a first Strand forming device (14) is conveyed and the sheet material (8a, 8b) for the second strand (21) from a second Bobinenvorrichtung (8) is removable and via a second material run to a second strand forming device (7) is conveyed, wherein in a second Operating mode of the device, the sheet material (1a, 8a) for the first strand (20) from the first and the second Bobinenvorrichtung (1, 8) is removable and over a third material run to the first strand forming device (14) is conveyed and the sheet material (1b, 8b) for the second strand (21) from the first and the second Bobinenvorrichtung (1, 8) is removable and a fourth material run to the second Strand forming device (7) is conveyed. Device after Claim 1 Characterized in that the third and fourth material travel during operation of the device intersect at least partially in the second mode. Device after Claim 1 or 2 characterized in that the first strand forming device (14) is associated with a first pivotable guide device (6) which guides the sheet material (1a, 1b, 8a, 8b) in the first mode in the first material run and in the second mode in the first run leads third material run, wherein a change of a pivot angle of the guide device (6) causes rotation of the strand formed by means of the first strand forming device (14) (20) about its longitudinal axis. Device according to one of Claims 1 to 3 characterized in that the second strand forming device (7) is associated with a second pivotable guide device (13) which guides the sheet material (1a, 1b, 8a, 8b) in the first mode in the second material run and in the second mode in the second performs a fourth material run, wherein a change of a pivot angle of the guide device (13) causes rotation of the strand formed by the second strand forming device (7) (21) about its longitudinal axis. Device after Claim 4 , characterized in that the first guide device (6) is arranged offset horizontally from the second guide device (13), wherein in particular the first guide device (6) is arranged vertically offset from the second guide device (13). Device after Claim 4 or 5 , characterized in that the first guide device (6) and the second guide device (13) are pivotable independently of each other. Device according to one of Claims 1 to 6 , Characterized in that downstream of the first Bobinenvorrichtung (1) a first Materialzugschneidvorrichtung (3) and downstream of the second Bobinenvorrichtung (8) a second Materialzugschneidvorrichtung (9) are provided, wherein the Materialzugschneidvorrichtungen (8, 9) are formed, the sheet material from the respective Bobinenvorrichtungen (1, 8) deduct and cut the sheet material longitudinally axially in each case two tracks (1a, 1b, 18a, 8b). Device after Claim 7 , characterized in that in the first mode of operation, the first material-cutting device (3) is provided in the first material run, wherein the device is formed from the sheet material cut by the first material-cutting device (3) in two webs (1a, 1b) to form an inner layer for the first strand (20), wherein in particular a control device (2) is provided, by means of which a tension of the two webs (1a, 1b) between the first material cutting device (3) and the first strand forming device (14) in common , in particular to an equal value, is controlled. Device after Claim 7 or 8th , characterized in that in the first mode of operation, the second material-cutting device (9) is provided in the second material run, the device being formed from the sheet material cut by the second material-cutting device (9) into two webs (8a, 8b) an inner layer for the second strand (21) to form, wherein in particular a control device (10) is provided by means of a tension of the two webs (8a, 8b) between the second Materialzugschneidvorrichtung (9) and the second strand forming device (7) in common , in particular to an equal value, is controlled. Device after Claim 9 characterized in that, in the second mode of operation, the webs (1a, 1b) cut from the sheet material of the first material cutting device (3) are conveyable in the third and fourth material runs so as to be directly onto the web Format strips (7a, 14a) of the first strand forming device (14) and the second strand forming device (7) rest, wherein in particular in the first pivotable guide device (6) one web (1a) and in the second pivotable guide device (13) the other web ( 1b) are deflectable. Device after Claim 10 , characterized in that a control device (2, 10) is provided which controls the tension of the two webs (1a, 1b) separated from each other, in particular temporarily with different values. Device according to one of Claims 9 to 11 characterized in that, in the second mode of operation, the webs (8a, 8b) cut from the sheet material by the second material cutting device (9) are conveyable in the third and fourth material runs so as to be inner layers of the first and fourth material runs second strand (20, 21) are used, wherein in particular in the first pivotable guide device (6) the one web (8a) and in the second pivotable guide device (13), the other web (8b) are deflected. Device after Claim 12 , characterized in that a control device (10) is provided, by means of which the tension of the two webs (8a, 8b) between the second Materialzugschneidvorrichtung (9) and the first and the second strand forming device (7, 14) together, in particular to a same Value, to be controlled. Device according to one of Claims 7 to 13 , characterized in that upstream of the first strand forming device (14) and the second strand forming device (7) only one spreading device (4, 11) are provided, by means of which in each material run a path of the cut sheet material in a plane of the respective web transversely to The conveying direction of the web is displaceable, so that an overlapping connection of an outer web is made possible with an inner web. Use of a device according to one of Claims 1 to 14 for producing double-layered hollow strands (20, 21), in particular hollow paper tubes, of the tobacco-processing industry. Use after Claim 15 , characterized in that the two layers of the hollow strands (20, 21) are made of the same material. Use after Claim 15 , characterized in that the two layers of the hollow strands (20, 21) are made of different material, wherein in particular the outer layers of the two hollow strands (20, 21) are made of the same material.

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