DE102014226019A1 - Doppellagiges tube of the tobacco processing industry and apparatus and method for producing such a tube - Google Patents

Abstract

The invention relates to a double-layered tube (10) of the tobacco-processing industry and to an apparatus for producing such a tube as well as a method for producing such a tube. The tube (10) according to the invention is produced from a first and a second material strip section (11, 12), the first material strip section (11) having a first width and the second material strip section (12) having a second width, the first and the second Material strip portion (11, 12) are wound around each other such that the first material strip portion (11) is formed in cross-section circular or oval and the first width defining edges (13, 14) are in abutment, wherein the second material strip portion (12) in Cross section is circular or oval shaped and the second width defining edges (15, 16) are in abutment, wherein the second material strip portion (12) on the outside around the first material strip portion (11) around, wherein between the first and the second strip of material strip ( 11, 12) an adhesive (17, 18) is provided.

Description

The invention relates to a double-layer tube of the tobacco-processing industry, a device for producing double-layered tubes of the tobacco-processing industry and a method for producing double-layered tubes of the tobacco-processing industry.

In the tobacco processing industry, tubes, such as paper tubes or paper tubes, are used to provide, for example, special filters such as a recess filter or a hollow filter. In addition, such tubes also serve as part of a diffuser which ensures that a nicotine-containing smoke is evened out. A corresponding tube should have a certain stability, which is why it is known to produce multi-walled paper tubes.

Out DE 25 56 332 A1 are a method and a machine for producing a multi-wall paper tube for smoking article mouth sleeves known in which a continuous strip of paper whose width is at least twice the circumference of the tube to be produced, is continuously withdrawn from a roll, the strip in the longitudinal direction by weaknesses with a Folding line is provided, by which the strip is divided into two strip portions, wherein the two strip portions are folded along the fold line, wherein the folded strip is formed into a double-walled tube. Here, the ends of the paper strip are connected by overlapping or underlapping the paper strip with the folded and bent edge.

It is an object of the present invention to increase the quality of correspondingly produced multilayer tubes and, in particular, to provide a device and a method by means of which the quality of a tube produced can be improved.

This object is achieved by a double-layered tube of the tobacco-processing industry, manufactured from a first and a second strip of material strip, the first strip of material having a first width and the second strip of material having a second width, wherein the first and the second strip of material wrapped around each other in that the first strip of material strip is circular or oval shaped in cross-section and the edges defining the first width are butted, the second strip of material section being circular or oval shaped in cross-section and the edges defining the second width being butt, the second strip of material strip is arranged outside around the first material strip portion, wherein between the first and the second material strip portion, an adhesive is provided.

Due to the double-layered tubes of the tobacco processing industry, the abutting edges of the first and second material strip sections have a very definable roundness at these transition points, whereby the quality of the produced double-layered tube is significantly improved compared to the prior art.

The adhesive may be, for example, polyvinyl acetate (PVA or PVAC). This is a thermoplastic material. Other adhesives or glues may be used.

Preferably, an adhesive is substantially completely or completely provided between the first and the second strip of material strip. The adhesive in this case preferably has a constant thickness over the circumference of the double-layered tube.

In the context of the invention, an abutment of edges of the respective material strip section means that these edges abut one another or are at a small distance from one another.

Preferably, adhesive is provided between at least two edges. In particular, adhesive may be provided to fill a gap between the edges.

It is particularly preferred if adhesive is provided between all edges. The possibly existing gap between the edges is thus preferably also filled with adhesive. The thickness of the filling is in this case such that the adhesive is preferably aligned with the surface of the material strip portion.

Preferably, the first width of the material strip portions is smaller than the second width. By this measure, it is possible to specify a double-layered tube, which has a small gap or no gap between the edges or the abutting edges, in particular in the outer layer.

Preferably, the first and / or the second strip of material strip is made of paper or cardboard.

A particularly stable double-layered tube of the tobacco-processing industry can be achieved if preferably the abutting edges of the first and second material strip sections are not radially aligned or radially out of alignment with each other. This means that the abutting edges of the first and second material strip section in Circumferentially offset from one another. The abutting edges or the corresponding gaps between the abutting edges are then at a radial angular distance from one another. The radial angular distance is preferably between 10 ° and 80 °, in particular between 10 ° and 45 °.

Preferably, the thickness of the first material strip portion corresponds to the thickness of the second material strip portion. In this case, the quality of the produced tube is particularly high.

In the case that the thickness of the second material strip portion is smaller than the thickness of the first material strip portion, it can be ensured that the adhesive used sets faster, so that the production speed can be increased.

• – eine Materialstreifenzuführvorrichtung,
• – eine Schneidvorrichtung zum längsaxialen Schneiden eines Basismaterialstreifens in einen ersten Materialstreifen mit einer ersten Breite und einen zweiten Materialstreifen mit einer zweiten Breite,
• – eine Beleimvorrichtung, mittels der der erste und/oder zweite Materialstreifen beleimbar ist,
• – eine Zusammenführvorrichtung, mittels der der erste und der zweite Materialstreifen zum Verkleben miteinander so zusammen geführt werden, so dass der erste und der zweite Materialstreifen versetzt zueinander übereinander liegen, und
• – eine Formatvorrichtung, in der aus den zusammengeführten ersten und zweiten Materialstreifen ein rohrförmiger Strang hergestellt wird.

The object is further achieved by a device for producing double-layered tubes of the tobacco-processing industry, which comprises the following features:

• A strip material feeder,
• A cutting device for longitudinally cutting a base material strip into a first strip of material having a first width and a second strip of material having a second width,
• A gluing device by means of which the first and / or second strip of material can be glued,
• - A merging device, by means of which the first and the second strip of material for bonding together so are performed together, so that the first and the second strip of material offset from each other superimposed, and
• - A format device in which from the merged first and second strips of material, a tubular strand is produced.

The material strip feeding device can be feeding rollers, via which a strip of material of a corresponding width can be conveyed. Usually, such a strip of material is attracted by a strip of material strip and conveyed into the corresponding device.

In the cutting device, which adjoins in the conveying direction of the material strip, it is preferably a longitudinal cutter which cuts the strip of material in the longitudinal axial direction.

The gluing device adjoining the cutting device glues essentially at least one of the two strips of material, that is, over the entire surface. the first and / or the second strip of material, wherein at this point also an area can be glued, which can serve as seam, i. in which, in a later formatting device, an end portion of the second strip of material for closing a seam is pressed onto the first strip of material. However, this area can also be glued in a subsequent step or provided with adhesive.

In the conveying direction, the joining device is followed by a joining device, which in the context of the invention preferably comprises a paper position adjusting device by means of which the lateral position, i. a relative position of the first and the second strip of material relative to one another, transversely to the conveying direction, can be adjusted to provide only a partial overlap of the first and second strip of material, so that viewed from the width of these strips of material a part to the left and a part to the right survives.

The apparatus for producing double-layered tubes of the tobacco-processing industry first of all firstly produces a tubular strand from at least two layers of a material strip. This tubular strand can then be cut to length, for example by a conventional knife device. It may also initially be provided to supply the manufactured tubular strand to another machine, for example a filter rod machine or a tobacco rod machine, in order to introduce a filter material and / or a tobacco material around the tubular strand and / or into the tubular strand. At the end, a wrapping material strip can then be wrapped around the strand then formed, and finally cut to length corresponding rods with the double-layered tubes contained therein.

Preferably, a separating device is provided, which spatially separates the first material strip or the second material strip from the respective other material strip in the conveying direction after the cutting device. In this way, a very accurate positioning and merging of the first and the second strip of material can take place, so that the relative lateral position can be adjusted to each other exactly. In addition, a clean gluing only a strip of material is made possible for this case.

In this case, it is particularly preferred if a first surface of the first and a first surface of the second material strip pointing in the same direction still point in the same direction after joining the first and second material strips. Alternatively, it can also be provided to rotate the first and second strips of material after cutting relative to each other by 180 °, so that one before cutting present first surface, which is cut into two first surfaces with the same orientation, is assembled so that the first surfaces of the first and second strips of material are arranged to each other.

Preferably, a first heating device is provided between the merging device and the format device. By means of the first heating device, the adhesive can be pre-cured so that the first and second strips of material are held together and still deformable, preferably so that the shape substantially already holds after being bent by itself.

Preferably, a Nahtbeleimungsvorrichtung is provided between the Zusammenführvorrichtung and the format device, in particular between the first heater and the format device. The seam-gluing device is used when the previous gluing device does not provide full-surface gluing. This refers to the gluing, which was not made in the cross-axial direction over the entire surface and thus only by means of the seam gluing device a glue or an adhesive is applied, which serves to close the seam. Preferably, a complete gluing through the gluing device and also the seam gluing device should be carried out transversely to the longitudinal axis.

Preferably, the format device comprises a second heating device. The second heating device may, for example, be arranged in the upper format of the format device and, in particular, preferably serves for complete setting of the adhesive.

It can also be provided an alternative variant, for example, the device according to the invention preceded by a conventional stranding machine and to use in the usual stranding machine a commonly used Nahtplätte as another heating device. In this preferred embodiment of a corresponding machine of the tobacco-processing industry can then be produced at a significantly higher speed, a corresponding tubular strand and thus corresponding double-layered tubes of the tobacco-processing industry. For example, this can be done at twice the speed.

Preferably, a cutting device is provided downstream of the formatting device for cutting tubes from the tubular strand.

As mentioned, a machine of the tobacco processing industry is preferably provided with a device according to the invention, wherein a strand machine of the device according to the invention is connected downstream.

• – Fördern eines Basismaterialstreifens in längsaxialer Förderrichtung,
• – längsaxiales Schneiden des Basismaterialstreifens in einen ersten Materialstreifen mit einer ersten Breite und einen zweiten Materialstreifen mit einer zweiten Breite,
• – Beleimen wenigstens des ersten oder des zweiten Materialstreifens,
• – versetztes Zusammenführen des ersten und des zweiten Materialstreifens, so dass der erste und der zweite Materialstreifen miteinander verklebt werden,
• – Formen der miteinander verklebten Materialstreifen in einen rohrförmigen Strang und
• – Ablängen des Strangs in doppellagige Röhrchen.

The object is further achieved by a method for producing double-layer tubes of the tobacco-processing industry, wherein the following method steps are provided:

• Conveying a base material strip in the longitudinal axial conveying direction,
• Longitudinal axial cutting of the base material strip into a first strip of material having a first width and a second strip of material having a second width,
• Gluing at least the first or the second material strip,
• Staggered merging of the first and second strips of material so that the first and second strips of material are glued together,
• - Forming the glued together strips of material in a tubular strand and
• - Cutting the strand into double-layered tubes.

Preferably, the gluing is done over the entire surface or approximately over the entire surface. An interruption of the gluing on the surface may be present, for example, where there is a seam of the other wrapping material strip. In particular, where there is a gap of the adjacent wrapping material strip or of the adjacent first or second material strip, namely between the edges or abutting edges of the respective material strip, there is a glue interruption. At this point, however, a gluing can be provided, so that in fact a full-surface gluing happens.

Preferably, a staggered merging means an offset in the width of the strip to each other adhesive bonding.

Preferably, the first strip of material is narrower than the second strip of material, wherein the second strip of material is arranged outside the first strip of material or is.

Preferably, the combined strips of material are heated prior to molding. As a result, the adhesive present between the strips of material hardens. However, the adhesive preferably does not cure completely in this process step, so that it still remains flexible in order to enable shaping, for example in a tubular strand.

Preferably, the merged strips of material are heated during and / or after molding. As a result, then the adhesive hardens in particular completely.

Preferably, seam gluing is provided during the gluing step, or seam gluing is provided after the merging. In the second variant, for example, different glues can be used to provide a needs-adapted gluing.

Preferably, multi-ply, especially double-ply, tubes are made from strip portions of material, preferably paperboard or paper, in which there are no overlapping seams. As a result, tubes are made or made available with a very constant thickness, which allows very high quality double-layered tubes of the tobacco processing industry. Due to the omission of the seam overlap a very good roundness is achieved. The double-layered tube is made of a preferably approximately twice as wide paper strip, compared to the circumference of the tube, wherein the paper strip is cut longitudinally into two slightly different widths strips, wherein the two produced paper strips are then guided in separate ways and preferably the wider and later outer strip is provided with a glue trace, the two paper strips are then placed one above the other and preferably pre-dried. Subsequently, a seam glue trace is preferably applied to the two-ply paper and the superimposed paper strips fed to the format of a formatting device to form a tubular strand and to close the seam.

Preferably, the device according to the invention is part of a modular slide-in device, which can be arranged, for example, preferably between an extrusion machine of the tobacco-processing industry and a filter wire preparation machine.

While the tubular strand is made from double-layered material strips, a correspondingly processed filter tow is conveyed through a corresponding insertion device and above the format device and introduced into an inlet region of the stranding machine. The tubular strand is also introduced into the inlet region, so that the filter tow can be introduced, for example, around or into the tubular strand so as to be able to produce filter rods.

It can also be provided that no further filter tow material is used, but the stranding machine is used to produce a manufactured tubular strand of double-layered material strip according to the invention faster by using a heating device of the stranding machine in addition to the at least one heating device of the device according to the invention to further cure the adhesive used. This allows the machine to be driven up to twice the conveying speed. This doubles the production rate of tubes cut to length in the stranding machine from the tubular strand.

It would also be possible to use a two-stranded filtration apparatus to produce a coaxial filter from the two-ply tubular tubing. One filter tow strand is then placed around the two-ply tubular strand and the other filter tow strand is inserted into the tubular strand. Thus, a coaxial filter can be produced after a corresponding cut to double-layered tubes. For this purpose, for example, an anchoring seam in the form of an adhesive is applied to the manufactured tubular strand of double-layered material strips, so that the filter tow also holds on the tubular strand. In the production of the coaxial filter, the first filter material and the second filter material may be different from each other.

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.

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 sectional view through a two-ply strip of material in a sectional plane transverse to the longitudinal axis of the strips of material,

2 a correspondingly produced inventive two-layered tube in a schematic sectional view,

3 a device according to the invention for the production of double-layered tubes in a schematic representation and

4 a schematic sectional view through a filter having a double-layered tube.

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 in a schematic sectional view transversely to the longitudinal axis of two strips of material 11 and 12 the condition of the first material strip 11 and the second strip of material 12 after they have been put together. It can be seen that the first strip of material 11 on its top an adhesive 17 , For example, a glue has. On the glue 17 The second strip of material is applied 12 ,

The first strip of material 11 has left and right edges 13 and 14 on and the second strip of material 12 left and right edges 15 and 16 ,

It is also on the first strip of material 11 a seam gluing 18 has been made, which serves with the right over the first strip of material 11 protruding part of the second strip of material 12 to provide a bond. The gluing 17 can at the same time as the gluing 18 be made or, as stated above, in retrospect, and prior to the formation of the tube or the tubular strand, in a format device.

After passing through the format device results in this constellation, a double-layered tubular strand or after the cutting of this strand a double-layered tube, which in cross section in 2 is shown schematically. Here then lies the first strip of material strip 11 inside, with the edges 13 and 14 are arranged on impact or with little distance from each other.

This push area 21 is not radially aligned with the joint area 20 of the second wrapping material strip 12 , There are also the edges 15 and 16 provided on impact or with a small distance from each other. The gaps of the shock areas 20 and 21 can also be provided with an adhesive. In the case of 2 However, no adhesive is provided. In contrast to the prior art results in a better roundness, since an overlap of the edge 16 for example, with the second wrapping material strip 12 just not provided, but an alignment or a substantially circular outer contour.

By moving the impact areas 20 and 21 in the circumferential direction is a very secure closure of the produced double-layered tube 10 allows. In addition, this results in an increased stability of the double-layered tubes 10 achieved because the vulnerabilities of the individual layers are spaced apart.

The thicknesses of the first material strip section 11 and the second material strip portion 12 each other may be different or substantially the same size. At different thicknesses, it is preferable if the outer material strip section, namely material strip section 12 , Thinner than the first strip of material strip 11 ,

3 shows schematically a device according to the invention for the production of double-layered tubes 10 the tobacco processing industry. In this embodiment, several variants of the device according to the invention are shown simultaneously.

From a reel, not shown, a correspondingly broad base material strip 24 in the conveying direction 34 deducted and over roles 41 directed. It closes a cutting device 23 to a stripper feeder 22 at. In the cutting device 23 becomes the base material strip 24 cut in the longitudinal direction. The cutting device 23 is a slitter.

The cut strips of material in the form of a first strip of material 25 and a second strip of material 26 will still be parallel over another pulley 41 promoted, then by means of a cross conveyor 32 to be separated from each other in the form of a pulley. The second strip of material 26 is after a further deflection by means of a gluing device 27 essentially completely glued, at least over the entire length. This glueing device 27 For example, if you omit the area of a seam, you do not necessarily have to.

The first strip of material 25 is separated from the second strip of material 26 promoted and by means of the offset device 29 offset in the transverse direction to the conveying direction, so that in the Zugrollenpaar 28 , by means of a union of the first material strip 25 with the second strip of material 26 happens, an offset Aufeinanderliegen the strips of material 25 and 26 is achieved. The strips of material are, for example, at this point as in 1 shown schematically.

Then there is a heater 35 provided by means of the applied glue or the applied adhesive 17 is pre-cured. In the event that a seam gluing has already taken place, the superimposed strips of material 25 and 26 a format device 30 fed. If the seam gluing has not yet taken place, this takes place by means of the seam gluing device 36 instead, between the heater 35 and the format device 30 is arranged.

In the format device presses the inlet finger 44 the strips of material down on the format tape 43 , which has corresponding pulleys 41 endless through the format device 30 to be led.

In the format device, the strips of material are converted into a round shape or an oval shape in a known manner. The upper format is here as a heated upper format 37 formed to the glue or the adhesive 17 continue to bind.

Subsequently, from the strand thus formed 31 by means of the cutting device 38 according to double-layered tubes are cut in the desired length.

Alternatively, it may be provided at this point that not yet tubes are cut to length, but the tubular strand 31 in a stranding machine 40 is introduced.

This can be provided on the one hand, just the produced tubular strand in the stranding machine 40 bring in and there with a in 3 heater not shown to let the adhesive continue to harden. In this case, a very fast production of appropriate tubes 10 from the then finally cured strand in the stranding machine 40 be cut to length, possible.

Alternatively, for example, a filter tow 46 from a filter trough processing device, which in 3 not shown, but in 3 to the right of the illustrated device, above the format 30 be guided over the device according to the invention and by a Zugrollenpaar 42 in the conveying direction 47 the stranding machine 40 be supplied. The filter tow 46 can then, for example, to the tubular strand 31 be arranged around.

So that the filter tow to the tubular strand 31 is held by means of a Ankernahtvorrichtung 45 an adhesive, for example, PVA, on the tubular strand 31 applied. In the stranding machine 40 Accordingly, a wrapping material strip can be wound around the strand of an inner tubular strand and an outermost filter tow in a format device and so a corresponding filter can be produced.

A matching filter is in 4 For example, shown schematically. The filter is here with the reference number 50 Mistake. The tube 10 lies inside, outside is a filter tow 48 and around it is a wrapping material 49 arranged.

The glueing device 27 and the suture gluing device 36 may be formed as flat nozzles or Spinnsprühdüsen. It is here preferably a two-dimensional application of adhesive or glue made.

The heater 35 can be optionally provided. This essentially serves for pre-curing or pre-curing of the adhesive.

For precise alignment of the paper webs relative to one another, in particular in order to set the correct offset in the width, corresponding sensors can be provided which detect the position of the edges of the material strips. It can then be provided corresponding control mechanisms to regulate the position of the strips of material to each other.

For easier rounding, especially of thick papers or boards, a pre-bending of the strip of material can be done immediately before the format device or immediately before the slitter.

The double-layered tube may have an inner diameter of, for example, 3 mm to 8 mm. The process speed of the process can be at least 250 m / min. be. Preferred is a process speed of 350 m / min or higher.

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

10

 tube

11

 first strip of material strip

12

 second strip of material section

13

 edge

14

 edge

15

 edge

16

edge

17

adhesive

18

 seam adhesive

20

joint area

21

joint area

22

 Materialstreifenzuführvorrichtung

23

 cutter

24

 Base material strips

25

 first strip of material

26

second strip of material

27

 gluing device

28

 Zugrollenpaar

29

offset device

30

format device

31

strand

32

cross conveyor

34

 conveying direction

35

 heater

36

 Nahtbeleimungsvorrichtung

37

 heated upper format

38

 Cutting device

40

rod machine

41

idler pulley

42

 Zugrollenpaar

43

 format tape

44

 intake finger

45

 Anchor suture application device

46

 filter tow

47

conveying direction

48

filter tow

49

 wrapping material

50

 filter

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

• DE 2556332 A1 [0003]

Claims (20)

Double-layered tube ( 10 ) of the tobacco processing industry, made of a first and a second strip of material strip ( 11 . 12 ), wherein the first strip of material strip ( 11 ) has a first width and the second material strip portion ( 12 ) has a second width, wherein the first and the second strip of material strip ( 11 . 12 ) are wound around each other such that the first strip of material strip ( 11 ) is circular or oval shaped in cross-section and the edges defining the first width ( 13 . 14 ) are in abutment with the second strip of material strip ( 12 ) is circular or oval shaped in cross section and the edges defining the second width ( 15 . 16 ) are in abutment with the second strip of material strip ( 12 ) around the first strip of material strip ( 11 ) is arranged around, wherein between the first and the second strip of material strip ( 11 . 12 ) an adhesive ( 17 . 18 ) is provided. Tubes ( 10 ) according to claim 1, characterized in that the first width is smaller than the second width. Tubes ( 10 ) according to claim 1 or 2, characterized in that the first and / or the second strip of material strip ( 11 . 12 ) is made of paper. Tubes ( 10 ) according to one of claims 1 to 3, characterized in that adhesive ( 17 . 18 ) between at least two edges ( 13 - 16 ) is provided. Tubes ( 10 ) according to one of claims 1 to 4, characterized in that the abutting edges ( 13 - 16 ) of the first and second material strip sections ( 11 . 12 ) are offset in the circumferential direction to each other. Tubes ( 10 ) according to one of claims 1 to 5, characterized in that the thickness of the first material strip section ( 11 ) of the thickness of the second material strip section ( 12 ) corresponds. Tubes ( 10 ) according to one of claims 1 to 5, characterized in that the thickness of the second material strip portion ( 12 ) is smaller than the thickness of the first material strip section ( 11 ). Device for producing double-layered tubes ( 10 ) comprising the tobacco processing industry - a strip material feeder ( 22 ), - a cutting device ( 23 ) for the longitudinal axial cutting of a base material strip ( 24 ) in a first strip of material ( 25 ) having a first width and a second material strip ( 26 ) with a second width, - a gluing device ( 27 ), by means of which the first and / or second strip of material ( 25 . 26 ) is glued, - a merging device ( 28 . 29 ), by means of which the first and the second strip of material ( 25 . 26 ) are conducted together for bonding together, so that the first and the second strip of material ( 25 . 26 ) offset from one another, and - a format device in which from the merged first and second strips of material ( 25 . 26 ) a tubular strand ( 31 ) will be produced. Apparatus according to claim 8, characterized in that a separating device ( 32 ) is provided, which the first strip of material ( 25 ) or the second strip of material ( 26 ) of the respective other strip of material ( 25 . 26 ) in the conveying direction ( 34 ) after the cutting device ( 23 ) separates spatially. Apparatus according to claim 8 or 9, characterized in that between the merging device ( 28 . 29 ) and the format device ( 30 ) a first heating device ( 35 ) is provided. Device according to one of claims 8 to 10, characterized in that between the merging device ( 28 . 29 ) and the format device ( 30 ), in particular between the first heating device ( 35 ) and the format device ( 30 ), a seam gluing device ( 36 ) is provided. Device according to one of claims 8 to 11, characterized in that the format device ( 30 ) a second heating device ( 37 ). Device according to one of claims 8 to 12, characterized in that a cutting device ( 38 ) downstream of the format device ( 30 ) is provided. Machine of the tobacco processing industry, characterized in that a device according to one of claims 8 to 13 is provided, which is a stranding machine ( 40 ) is connected downstream. Method for producing double-layered tubes ( 10 ) of the tobacco processing industry with the following procedural steps: - conveying a base material strip ( 24 ) in the longitudinal axial conveying direction ( 34 ), - longitudinal axial cutting of the base material strip ( 24 ) in a first strip of material ( 25 ) having a first width and a second material strip ( 26 ) with a second width, Gluing at least the first or the second material strip ( 25 . 26 ), - offset merging of the first and the second strip of material ( 25 . 26 ), so that the first and the second strip of material ( 25 . 26 ) are glued together, - forms of the glued together strips of material ( 25 . 26 ) in a tubular strand ( 31 ), and - cutting the strand ( 31 ) in double-layered tubes ( 10 ). A method according to claim 15, characterized in that the gluing is done over the entire surface or approximately over the entire surface. Method according to claim 15 or 16, characterized in that the first strip of material ( 25 ) is narrower than the second strip of material ( 26 ) and that the second strip of material ( 26 ) outside around the first strip of material ( 25 ) is or is arranged. Method according to one of claims 15 to 17, characterized in that prior to molding the merged strips of material ( 25 . 26 ) are heated. Method according to one of claims 15 to 18, characterized in that the merged strips of material ( 25 . 26 ) are heated at and / or after molding. Method according to one of claims 15 to 19, characterized in that the gluing step a seam gluing is provided, or after merging a seam gluing is provided.

Images