EP3381303A1 - Method for producing at least double-layer tubular strands in the tobacco processing industry and device for producing at least double-layer strands of tobacco - Google Patents

Abstract

The invention relates to a method for producing at least two-ply tubular strands of the tobacco-processing industry and to an apparatus for producing at least two-ply strands of the tobacco-processing industry. To produce a strand (31), a base material strip (24) is cut into a first strip of material (25) having a first width and a second strip of material (26) having a second width, wherein the width of the first or second strip of material (25, 26 ) is measured and the cutting operation is controlled so that the width of this material strip is regulated to a predetermined value.

Description

The invention relates to a method for producing at least two-ply tubular strands of the tobacco processing industry.

The invention also relates to an apparatus for producing at least two-ply tubular strands of the tobacco processing industry.

In the tobacco processing industry strands, such as tobacco strands, filter strands or hollow tubes, made to cut these into sections, which are then further processed, for example, to filter cigarettes.

In addition, tubes, such as cardboard tubes or paper tubes, used to provide, for example, special filters, such as a recess filter or a hollow filter available. In addition, serve such Tubes also as spacers in heat-not-burn products. A corresponding tube should have a certain stability, which is why it is known to produce multi-walled paper tubes. Such tubes are cut to length from hollow tube strands.

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a continuous strip of paper whose width is at least twice the circumference of the tube to be produced, is continuously withdrawn from a roll, the strip in the longitudinal direction by weaknesses with a Folding line is provided, by which the strip is divided into two strip portions,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.

EP 3 033 952 A2 discloses a double-layered tube of the tobacco processing industry and an apparatus and method for making such a tube.

In order to improve the quality of strands or tubes based on two strips of material, devices are used for separating the strips of base material, as used, for example, in US Pat EP 1 186 247 B1 are disclosed. This device comprises a longitudinal cutting device for separating a base material strip, measuring devices for monitoring the width of the partial webs which arise after the separation of the base material strip, and an actuator. The measuring organs monitor whether there is a deviation of the width, ie the extent of the material strips transverse to the cutting direction, between the two partial webs. If such a width deviation is detected, the actuator brings the relative transverse displacement of the center line of the base material strip with the position of the longitudinal section of the slitter in coincidence. On This ensures that the partial webs always have the same width.

However, after being formed into a tubular strand, the circumference of the circle defined by the inner strip of material in the strand section differs from the circumference of the circle defined by the outer strip of material in the strand section. When using two strips of material having the same width, therefore, the edges defining the width of the outer strip of material have a spacing after forming the strips of material into a tubular strand and / or an overlap or underlapping occurs at the edges defining the width of the inner strip of material inner material strip. Such impact areas, overlaps and underlaps reduce the quality and stability of such manufactured strands or tubes.

In addition, the outer diameter of a strand or tube made using two strips of material of equal width depends on the width of the base material strip. If the width of the base material strip changes, for example due to production defects, the outer diameter of the tubular strands or tubes produced from these base material strips also changes. This has the consequence that the outer diameter and thus the quality of the produced strands or tubes depend in particular on the width variance of the base material strip.

It is the object of the present invention to provide a method and a device by means of which the quality of strands or tubes produced in this way can be improved, this improved quality having a lower dependence on a width variance of the base material strip.

• 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, wobei die Breite des ersten und/oder des zweiten Materialstreifens gemessen und das Schneiden so gesteuert wird, dass die Breite des gemessenen Materialstreifens auf einen vorgegebenen Wert gestellt wird,
• Beleimen wenigstens des zweiten Materialstreifens, wobei insbesondere das Beleimen vollflächig oder annähernd vollflächig geschieht,
• versetztes Zusammenführen des ersten und des zweiten Materialstreifens, so dass der erste und der zweite Materialstreifen übereinander gelegt und miteinander verklebt werden, und
• Formen der miteinander verklebten Materialstreifen in einen rohrförmigen Strang.

This object is achieved by a method for producing at least two-ply tubular strands of tobacco processing Industry with the following process steps:

• Conveying a base material strip in the longitudinal axial conveying direction,
• longitudinally 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, wherein the width of the first and / or the second strip of material is measured and the cutting is controlled so that the width of the measured strip of material to a predetermined value is provided,
• Gluing at least the second strip of material, wherein in particular the gluing is done over the entire surface or approximately over the entire surface,
• staggered merging of the first and the second strip of material, so that the first and the second strip of material are superimposed and glued together, and
• Form the glued together strips of material in a tubular strand.

Usually, the base material strip has a fixed width with a width variance indicated by the manufacturer of the base material strip. Such a width may for example be 31.30 mm with a width variance of 0.05 mm. In the context of the invention, a job is in particular a tax or rules.

By setting, controlling or controlling the cutting process to the width of a strip of material, the width of this strip of material has a predetermined fixed size. This width is independent of the width of the base material strip. In this way, a consistently high quality of the molded from this strip of material interior or Outer strand wall, reached. Since in this way at least one strand wall has a constant quality, the quality of the strands or tubes produced in this way also has a lower dependence on the width variance of the base material strip.

Preferably, the base material strip is conveyed for cutting in its longitudinal axis. Preferably, the at least one knife, in particular circular blade, stationary during cutting, so it is not moved linearly. For this purpose, in the case of a knife designed as a circular knife, the axis of rotation of the circular knife is stationary.

Preferably, the strip of material whose width is set to a predetermined value, the first strip of material, wherein the first strip of material, the radially inner layer and the second strip of material forms the radially outer layer of the tubular strand.

By adjusting, controlling or regulating the width of the first strip of material, the quality of the strands produced is increased since the width of the first strip of material determines the diameter, in particular the outer diameter, of the strand produced. Thus, by defining a first width, strands having a constant outer diameter can be made, even if there is a change in the width of the base material strip.

It is particularly preferred if the first strip of material is formed in a tubular strand during the molding of the strips of material bonded together so that the edges defining the first width are in abutment.

The inner material strip is crucial for the stability of the manufactured strand. The stability and the quality is improved in particular in strands in which the edges defining the first width are in abutment with respect to strands in which a distance between These edges are present or there is an overlap or underlapping of these edges.

Preferably, the outer diameter of the tubular strand is calculated by means of the predetermined first width, wherein it is determined whether the calculated outer diameter lies within a, in particular predefinable, tolerance range.

By specifying such a tolerance range of the outer diameter of the tubular strand is checked whether the produced strands or tubes produced after cutting the strand for the intended use, for example as a filter strand, are suitable. Since the outer diameter of the strand produced is determined solely by the first width and the known thickness of the strips of material, the outer diameter can be calculated using simple geometrical considerations. In a first approximation, the diameter is equal to the first width divided by the number Pi (3.14159265359), wherein twice the thickness of the strip of material is added up. With a thickness of the material strip of 0.125 mm and a first width of 15.250 mm, for example, results in an outer diameter of 5.229 mm.

Preferably, the first width, as a function of the determined by a measurement width of the base material strip, so specified that the outer diameter of the tubular strand within the, in particular predeterminable, tolerance range is varied so that the distance of the second width defining edges after molding in a tubular strand is minimized, in particular minimized so that the edges defining the second width are in abutment.

Thus it is exploited that for the outer diameter of the strands no fixed value, but a tolerance range is specified. By varying the outer diameter within the limits of this tolerance range is achieved that the distance of the second width defining edges is minimized and continue to be the first width defining edges on impact. The variation of the outer diameter is made solely by a variation of the first width.

In particular, strands are produced by this approach, which have inner and outer joint areas with a width of 0.0 mm, so the width of the first and the second strip of material defining edges are in abutment, and thus have a high stability and quality. Even if the base material strip has a width variance, ie the width of the base material strip changes during the continuous execution of this method, strands are still produced in which the edges defining the width of the first and the second strip of material are in abutment and the outer diameter of the strands is only changed within the tolerance range.

Preferably, when calculating an outside of the, in particular predeterminable, tolerance range lying outside diameter and / or lying outside of another, in particular specifiable, tolerance range distance of the second width defining edges issued a warning, in particular the process stopped.

This is advantageous in order to ensure the production of strands suitable for the field of application and thus to avoid waste of material.

Preferably, a height adjustment of an upper format of a format device is performed depending on the outer diameter of the tubular strand.

The format device serves to form the bonded together strips of material in a tubular strand. In order to improve the quality of the strands produced, it is therefore advantageous to adapt the formatting device to the calculated outside diameter of the strand.

Preferably, the position of the strips of material in the direction transverse to the conveying direction is further regulated such that after shaping into a tubular strand, the outer joint region, preferably the outer joint region and the inner joint region, are aligned in the circumferential direction of the strand with respect to an upper format of a format device, preferably the outer impact area is centered under the upper format.

With a device according to EP 3 056 097 A1 The position of the material strip can be adjusted with a very high accuracy. This device may preferably be arranged in the conveying direction shortly before the format device.

Such an orientation of the impact areas is useful if an adhesive or glue is used for gluing, which hardens by heating or cooling. In this case, the upper format of the format device used to form the strips of material in a tubular strand may be formed as a heated or cooled top format to accelerate the curing of the adhesive. A detachment of an edge region can be prevented so efficiently. Thorough curing of the adhesive to bond the joint areas, particularly the outer joint area, results in production of strands having high stability and quality.

In order to accelerate the curing of the adhesive or glue for bonding the impact areas, the outer impact area can be aligned with respect to the circumference of the strand by aligning the position of the material strips in the direction transverse to the conveying direction, that it centrally and directly below the heated or cooled upper format, that is in a 12 o'clock position at a centrally located above the strand upper format is arranged.

In order to achieve a high stability of the tubular strand, the inner impact area in the circumferential direction of the strand should be arranged offset relative to the outer joint area. Preferably, the distance in the circumferential direction between the outer joint area and the inner joint area is controlled so that the inner joint area for curing the adhesive is heated or cooled by the upper size as much as possible, but still a sufficiently large distance in the circumferential direction to to achieve a high stability of the strand.

Preferably, when staggered merging of the first and second strips of material, an overlap area of the first and second strips of material is created while maintaining the width of the overlapping area at a constant value.

• eine Materialstreifenzuführvorrichtung,
• eine Schneidvorrichtung, umfassend wenigstens ein Messer, insbesondere wenigstens ein rotierendes Kreismesser, zum längsaxialen Schneiden eines Basismaterialstreifens in einen ersten Materialstreifen mit einer ersten Breite und einen zweiten Materialstreifen mit einer zweiten Breite,
• ein Stellorgan zur Ausrichtung der relativen Querverstellung, also der Ausrichtung in Querrichtung, des Basismaterialstreifens bezüglich der Position des wenigstens einen Messers, wodurch die Schnittposition und hierdurch die erste und zweite Breite festgelegt wird,
• eine Messvorrichtung zur Messung der Breite des ersten Materialstreifens und/oder des zweiten Materialstreifens,
• eine Steuerungs- oder Regelungsvorrichtung, der die Daten der Messvorrichtung zugeführt werden oder zuführbar sind und die so eingerichtet ist, dass sie das Stellorgan so steuert, dass die Breite des vermessenen Materialstreifens auf einen vorgegebenen oder vorgebbaren Wert gesteuert, insbesondere geregelt, wird,
• eine Beleimvorrichtung, mittels der der erste Materialstreifen oder der zweite Materialstreifen beleimbar ist,
• eine Zusammenführvorrichtung, mittels der die Materialstreifen zum Verkleben miteinander so zusammen geführt werden, dass die Materialstreifen versetzt zueinander übereinander liegen, und
• eine Formatvorrichtung, in der aus den zusammengeführten Materialstreifen ein rohrförmiger Strang gebildet wird oder herstellbar ist.

The object is further achieved by a device for producing at least two-ply tubular strands of the tobacco-processing industry comprising:

• a strip material feeder,
• a cutting device comprising at least one knife, in particular at least one rotating circular knife, for the longitudinal axial cutting of a base material strip into a first strip of material having a first width and a second strip of material having a second width,
• an actuator for aligning the relative transverse displacement, ie the orientation in the transverse direction, of the base material strip with respect to the position of the at least one blade, whereby the cutting position and thereby the first and second widths is determined,
• a measuring device for measuring the width of the first strip of material and / or the second material strip,
• a control or regulating device to which the data of the measuring device are supplied or can be supplied and which is set up so that it controls the actuator so that the width of the measured strip of material controlled to a predetermined or predetermined value, in particular regulated,
• a gluing device by means of which the first strip of material or the second strip of material can be glued,
• a merging device, by means of which the strips of material for gluing together are guided together so that the strips of material offset from each other superimposed, and
• a formatting device in which a tubular strand is formed or can be produced from the merged strips of material.

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. The promotion of the material strip happens in this case in a direction along the longitudinal axis of the strip of material.

The actuator may be, for example, a pair of rollers contacting the base material strip on top and bottom sides, which can be pivoted by a motor about a common axis of rotation perpendicular to the roll axes and perpendicular to the conveying direction of the base material strip. The actuator is arranged in the conveying direction behind the Materialstreifenzuführvorrichtung.

In the cutting device, preferably in the conveying direction of the material strip is arranged downstream of the actuator, it is a slitter, which cuts in the strip of material in the longitudinal axial direction.

Preferably, a knife, in particular circular blade, stationary during cutting, so is not moved linearly. For this purpose, in the case of a knife designed as a circular knife, the axis of rotation of the circular knife is stationary.

In the measuring device, which is arranged in the conveying direction behind the cutting device, it may be, for example, at least one photoelectric compact laser light barrier or laser light barrier.

The control device may be, for example, a computer system having input and output channels. It is arranged to record the data of the measuring device, perform the calculation necessary to determine the cutting position, and control or control the control member or rotation of the control member so that the measured strip of material is cut to the calculated width.

By using a control device adapted to control or regulate the width of a strip of material to a predetermined fixed size, it is preferred that the quality of the strip wall formed from this strip of material be consistent and thus less dependent on the width variance of the base strip reached.

The gluing device adjoining the measuring device glues substantially over the entire surface at least one of the two strips of material, ie the first and / or the second strips of material, at which point an area can also be glued which can serve as a seam, ie in a later one Formatvorrichtung an end portion of the second material strip is pressed to close a seam on the first strip of material. However, this area can also be glued in a subsequent step or provided with adhesive. The gluing device can be a gluing device which corresponds to a gluing device which is in the EP 2 974 798 A1 is described.

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 second strips of material relative to each other across the conveying direction can be adjusted to provide only a partial overlap of the first and second strips of material so that one portion to the left and one to the right seen from the width of this strip of material survives.

The apparatus for producing at least two-ply tubular strands of the tobacco processing industry can also be used for the production of double-layered tubes. For this purpose, the tubular strand is 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 arrange a filter material or a tobacco material around the tubular strand. At the end, a wrapping material strip can then be wrapped around the strand then formed, and then subsequently cut into rods with the double-layered tubes contained therein.

In addition, a separating device is preferably 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. This allows a very accurate positioning and merging the first and the second strip of material, 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 relative to each other by 180 ° after cutting, so that a first surface present before cutting, which is cut into two first surfaces with the same orientation, is brought together so that the first Surfaces of the first and second strips of material are arranged to each other.

In addition, a first heating device can be provided between the merging device of 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 by itself already substantially holds.

Preferably, the gluing device provides a full-surface or almost full-surface gluing of the first and / or the second strip of material.

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 carried out 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 can be arranged, for example, in the upper format of the format device and, in particular, preferably serves for complete setting of the seam adhesive.

It may also be provided an alternative variant, for example, the device shown upstream of 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 with a significantly improved running stability, a corresponding tubular strand or a corresponding double-layered tube of the tobacco-processing industry.

Preferably, the control device is arranged to control or regulate the first width, the first strip of material forming the radially inner layer and the second strip of material forming the radially outer layer of the multilayer tubular strip.

More preferably, the control device is arranged to control or regulate the first width such that the edges defining the first width are in abutment after being formed into a tubular strand.

Furthermore, the control or regulating device is preferably set up in such a way that it also calculates the outer diameter of the tubular strand for each first width set by it and determines whether the calculated outer diameter is within a, in particular specifiable, Tolerance range is.

Preferably, a further measuring device is provided, wherein this further measuring device is arranged in the conveying direction in front of the actuator and adapted to determine the width of the base material strip.

Preferably, the control device is arranged to control the first width, depending on the width of the base material strip, such that the outer diameter of the tubular strand is varied within the, in particular predeterminable, tolerance range such that the distance between the second width defining edges after molding in a tubular strand is minimized, in particular the second width defining edges put on impact.

In this way, in particular strands are produced during operation of the device, in which the edges defining the width of the first and second strips of material are in abutment and the outer diameter of the strands changes only within the, in particular predeterminable, tolerance range, even if the width of the base material strip, for example due to a width variance of the base material strip changed.

Preferably, the control or regulating device is also set up so that it outputs a warning message when calculating an outside of the, in particular specifiable, tolerance range lying outside diameter and / or outside of another, in particular specifiable, tolerance range defining the second width defining edges, in particular the device stops.

Preferably, the control device is adapted to adjust the height of an upper format of the pipe depending on the calculated outer diameter of the tubular strand Formatting device performs. As a result, the outer diameter can be changed in a simple manner.

In addition, at least one edge sensor for measuring the position of the material strips in the direction transverse to the conveying direction and at least one transverse displacement device for displacing the position of the material strips in the direction transverse to the conveying direction are additionally provided, wherein the at least one edge sensor and the at least one transverse displacement device between the cutting device and the format device , are preferably arranged between a cross conveyor and a Zugrollenpaar.

A suitable transverse displacement device is in EP 3 056 097 A1 shown.

By the at least one edge sensor and the at least one transverse displacement device, the position of the material strips in the direction transverse to the conveying direction can be adjusted so that the position of the outer and the inner joint area in the circumferential direction after forming the strips of material in a tubular strand with respect to the position of heated or cooled upper format is controlled. If the position of, for example, the second material strip changes in the direction transverse to the conveying direction, the position of the outer impact region in the circumferential direction of the strand, which is formed from the material strips in the format device, also changes. In particular, the position of the outer joint region can be controlled such that the outer joint region in the format device is arranged centrally directly below the upper format. In this way, the curing of the adhesive or glue, with which the edges defining the second width, is accelerated.

In order to control the position of both the outer and inner abutment regions, it is preferable to use at least two pairs each consisting of an edge sensor and a transverse displacement device, which are arranged in the region of the device in which the first strip of material is conveyed separately from the second strip of material.

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.

Fig. 1

eine schematische Schnittdarstellung durch einen doppellagigen Materialstreifen in einer Schnittebene quer zur Längsachse der Materialstreifen,

Fig. 2

einen entsprechend hergestellten erfindungsgemäßen doppellagigen Strang in einer schematischen Schnittdarstellung,

Fig. 3

eine erfindungsgemäße Vorrichtung zur Herstellung eines Hohlfilterstrangs in schematischer Darstellung,

Fig. 4

einen schematischen Bahnverlauf zum Schneiden eines Basismaterialstreifens in zwei Materialstreifen.

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:

Fig. 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,

Fig. 2

a correspondingly produced two-ply strand according to the invention in a schematic sectional representation,

Fig. 3

a device according to the invention for producing a hollow filter strand in a schematic representation,

Fig. 4

a schematic path for cutting a base strip of material in two strips of material.

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.

Fig. 1 shows in a schematic sectional view transversely to the longitudinal axis of two strips of material 25 and 26, the state of the first strip of material 25 and the second strip of material 26, after they have been joined together. It can be seen here that the first material strip 25 has on its upper side a position adhesive 17, for example a glue. Positioned on the position adhesive 17 is the second material strip 26.

The first strip of material 25 has left and right edges 13 and 14 and the second strip of material 26 left and right edges 15 and 16th

It has also been made on the first material strip 25 a Nahtbeleimung 18, which serves to provide with the right above the first material strip 25 protruding part of the second strip of material 26, a bond. Seam gluing strips may also be provided, for example, a suture gluing strip 18 on one side of the first strip of material 25 and another suture gluing strip on the opposite side of the strip 26. The gluing 17 may be made at the same time as the gluing 18 or as previously indicated in hindsight, prior to the formation of the tube or tubular strand, in a format device.

After passing through the format device results in this constellation, a double-layered tubular strand 31, which in cross section in Fig. 2 is shown schematically. Here then lies the first material strip 25 in the interior, wherein the edges 13 and 14 are arranged at impact or with little distance from each other.

This inner joint region 21 is radially out of alignment with the outer joint region 20 of the second wrapping material strip 26. There are also the edges 15 and 16 are provided on impact or with a small distance from each other. The gaps of the butt portions 20 and 21 may also be provided with an adhesive. In the case of Fig. 2 but it is not Adhesive 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 26 just not provided, but an alignment or a substantially circular outer contour.

By displacing the impact regions 20 and 21 in the circumferential direction, a very secure closure of the produced tubular strand 31 or after cutting to length the double-layered tube is made possible. In addition, an increased stability of the tubular strands 31 and the double-layered tubes is thereby achieved, since the weak points of the individual layers are spaced apart.

The thicknesses of the first material strip 25 and the second material strip 26 are substantially the same size.

Fig. 3 shows schematically a device according to the invention for the production of at least two-ply tubular strands 31 or double-layered tubes of 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 wide base material strip 24 is withdrawn in the conveying direction 34 and directed over rollers 41. It is followed by a cutting device 23 to a Materialstreifenzuführvorrichtung 22 at. In the cutting device 23, the base material strip 24 is cut longitudinally. 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 are conveyed in parallel via a further deflection roller 41, in order then to be separated from each other by means of a transverse conveyor 32 in the form of a deflection roller. The second strip of material 26 is after a further deflection by means of a gluing device 27 substantially completely glued, at least over the entire length. For example, this gluing device 27 may omit the area of a seam, but need not necessarily do so.

The first material strip 25 is conveyed separately from the second material strip 26 and offset by means of the offset device 29 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 material strip 26, an offset Aufeinanderliegen the strips of material 25 and 26 is achieved. The strips of material are, for example, at this point as in Fig. 1 shown schematically.

Subsequently, a heating device 35 is provided, by means of which the applied glue or the applied adhesive 17 is precured. In another embodiment, however, a cooling device, not shown here, can be used if the setting of the glue or the adhesive 17 requires a reduction in temperature. It is also a variant without heater or cooler possible. In the event that a seam gluing has already taken place, the superimposed strips of material 25 and 26 are fed to a formatting device 30. If the seam gluing has not yet taken place, this takes place by means of the seam gluing device 36, which is arranged between the heating device 35 and the format device 30.

In the format device, the inlet finger 44 presses the strips of material down onto the format strip 43, which is guided endlessly through the format device 30 via corresponding deflection rollers 41.

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 designed here as a heated upper format 37 in order to further bind off the glue or the adhesive 17. In another embodiment, however, a cooled upper format may also be used when setting the glue or the adhesive 17 is a temperature reduction is required.

Subsequently, correspondingly double-layered tubes in the desired length can be cut off from the strand 31 thus formed by means of the cutting device 38.

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

For this purpose, on the one hand, it may be provided simply to introduce the manufactured tubular strand into the stranding machine 40 and to place it there with an in Fig. 3 heater not shown to let the adhesive continue to harden. For this case, a very fast production of corresponding tubes 10, which are cut to length from the then finally cured strand in the stranding machine 40, is possible.

Alternatively, for example, a filter tow 46 may be formed from a filter trough processing apparatus disclosed in U.S. Pat Fig. 3 not shown, but in Fig. 3 would be arranged to the right of the device shown, are guided above the format 30 on the device according to the invention and fed by a Zugrollenpaar 42 in the conveying direction 47 of the stranding machine 40. The filter turr 46 may then be placed around the tubular strand 31, for example.

In order for the filter tow to rest on the tubular strand 31, an adhesive, for example also PVA, is applied to the tubular strand 31 by means of an anchoring seam device 45. In the stranding machine 40, a wrapping material strip may be correspondingly wound around the strand of an inner tubular strand and an outermost filter tow in a formatting device to produce a corresponding filter.

A matching filter has an inner tube about which a filter tow is placed on the outside, around which a wrapping material is placed.

The sizing device 27 and the seam sizing device 36 can be used as flat nozzles, spin-spray nozzles or according to FIG EP 2 974 798 A1 be educated. It is here preferably a two-dimensional application of adhesive or glue made.

The heater 35 may optionally be 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 after the slitter.

The tubular strand or the double-layered tube may have an inner diameter of, for example, 3 mm to 8 mm.

Fig. 3 also shows an edge sensor 59 and a transverse displacement device 60, which are arranged between Zugrollenpaar 28 and heater 35. However, this is only one possible arrangement of the edge sensor 59 and the transverse displacement device 60. According to the invention, both the edge sensor 59 and the transverse displacement device 60 can be arranged at any position between the cutting device 23 and the format device 30. Also, the invention is not limited to the use of only one edge sensor 59 and only one Transverse displacement device 60 limited.

In this embodiment, the edge sensor 59 measures the position of the bonded material strips 25, 26 transversely to the conveying direction 34 and transmits this measurement data to the transverse displacement device 60. The transverse displacement device 60 compares the measurement data with a predetermined value for the transverse position of the bonded material strips 25, 26 The value is such that, after forming the strips of material 25, 26 into a tubular strand 31, the circumferential position of the outer joint region 20 has a fixed position on the upper format, for example, the heated upper format 37, in particular the circumferential position of the outer joint region 20 a 12 o'clock position has at a central above the strand arranged upper format. The transverse adjustment device now controls the position of the bonded material strips 25, 26 transversely to the conveying direction 34 so that it coincides with the predetermined value.

In order to determine also the position of the inner abutment region 21 in the circumferential direction of the strand 31 with respect to the upper format, two edge sensors 59 and two transverse displacement devices 60 may be used, with a pair of edge sensor 59 and transverse displacement device 60 between cross conveyor 32 and traction roller pair 28 in the path of the first material strip 25 and another pair of edge sensor 59 and transverse displacement device 60 are arranged between transverse conveyor 32 and Zugrollenpaar 28 in the path of the second strip of material 26. In this way, the position of the individual material strips 25, 26 transversely to the conveying direction 34 and thus also the position of the abutting regions 20, 21 in the circumferential direction of the strand 31 can be adjusted individually.

Fig. 4 schematically shows the trajectory for cutting a base material strip in two strips of material. The base material strip 24 is conveyed in the conveying direction 34 by the material strip feeding device 22, not shown. By means of the at least one knife 57, which is disposed in the cutter 23, the base material strip 24 is cut into a first strip of material 25 and a second strip of material 26. By means of a transverse conveyor 32, the first material strip 25 and the second material strip 26 are separated from each other.

The measuring device 53, which is arranged in the conveying direction after the cross conveyor 32, measures the width of a strip of material, in particular of the first material strip 25, and transmits the measured data to the control device 55.

The control or regulating device 55 now compares the measured width of the strip of material with a predeterminable width for this strip of material, wherein in particular the predetermined width corresponds to a width which is suitable for the production of strands with a high quality. If the measured width deviates from the predetermined width, the control or regulating device 55 controls the actuator 52 so that the actuator 52 performs a relative transverse adjustment, ie an adjustment in the transverse direction 56, of the base material strip 24.

Due to the relative transverse adjustment of the base material strip 24, the orientation of the base material strip 24 with respect to the at least one knife 57 changes in the transverse direction 56, resulting in an altered first width and second width after the cutting operation.

The control device 55 calculates which relative lateral displacement is necessary to match the width measured by measuring members 53 with the predetermined width, and controls the actuator accordingly.

In the in Fig. 4 In the embodiment shown, a further measuring device 54 is additionally arranged in front of the actuator 52 in the conveying direction 34. This further measuring device 54 measures the width of the base material strip 24 and transmits it to the control or regulating device 55. The control device 55 determines now taking into account the width of the base material strip 24 an outer diameter 51 of the tubular strand 31 (see. Fig. 2 ), in which both the first width defining edges 13, 14 and the second width defining edges 15, 16 abut and controls the actuator 52 in a manner that the first width and the second width are controlled to a value which is necessary for the production of such a molded strand.

If the controller 55 calculates an outer diameter 51 of the tubular string 31 that is out of tolerance, and / or an outer joint region 20 that is outside of another tolerance range, then the controller 55 issues a warning. In the in Fig. 4 As shown, this is achieved by the control or regulating device activates a warning light 58. However, the invention is not limited to the use of a warning light 58. The warning message can also be issued in other ways, for example via a user interface of a control computer.

In another embodiment, the control device 55 is also arranged to stop the apparatus for producing at least two-ply tubular strands of the tobacco processing industry in addition to issuing the warning. For this purpose, the control or regulating device is set up so that it is at least connected to the material strip supply device 22 and stops it when a warning or a fault occurs. In this way it is ensured that only tubular strands are produced, which have a predetermined quality.

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 by single features or a combination of several features be fulfilled. 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

13

edge

14

edge

15

edge

16

edge

17

position adhesive

18

seam adhesive

20

outer joint area

21

inner shock area

22

Materialstreifenzuführvorrichtung

23

cutter

24

Base material strips

25

first strip of material

26

second strip of material

27, 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

51

outer diameter

52

actuator

53

measuring device

54

measuring device

55

Control or regulating device

56

transversely

57

knife

58

warning light

59

edge sensor

60

Transverse adjustment device

Claims (15)

Method for producing at least two-ply tubular strands (31) of the tobacco-processing industry with the following method steps: Conveying a base material strip (24) in the longitudinal axial conveying direction (34), Longitudinally cutting the base material strip (24) into a first strip of material (25) having a first width and a second strip of material (26) having a second width, measuring the width of the first and / or second strip of material and controlling the cutting, that the width of the measured material strip is set to a predetermined value, - Gluing at least the second strip of material (26), wherein especially the gluing over the whole area or almost completely over the entire area, - Staggered 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 superimposed and glued together, and - Forming the glued together strips of material (25, 26) in a tubular strand (31). A method according to claim 1, characterized in that the strip of material whose width is set to a predetermined value, the first strip of material (25), wherein the first strip of material (25) the radially inner layer and the second strip of material (26) forms in the radial direction outer layer of the tubular strand (31). A method according to claim 2, characterized in that the first strip of material (25) is formed into a tubular strand (31) during the molding of the material strips (25, 26) bonded together so that the edges defining the first width (13, 14) lying on bump. A method according to claim 3, characterized in that by means of the predetermined first width of the outer diameter (51) of the tubular strand (31) is calculated, it being determined whether the calculated outer diameter (51) is within a, in particular predeterminable, tolerance range, in particular the first width, as a function of the width of the base material strip (24) determined by means of a measurement, is predetermined such that the outer diameter (51) of the tubular strand (31) is varied within the, in particular specifiable, tolerance range such that the distance between the second width defining edges (15, 16) is minimized after molding into a tubular strand (31), in particular minimized so that the edges (15, 16) defining the second width are in abutment. A method according to claim 4, characterized in that when calculating a lying outside of the, in particular predeterminable, tolerance range outer diameter (51) and / or lying outside of another, in particular specifiable, tolerance range of the second width defining edges (15, 16) a Warning message is issued, in particular the process is stopped. A method according to claim 4 or 5, characterized in that depending on the outer diameter (51) of the tubular strand (31) a height adjustment of an upper format of a format device (30) is performed. Method according to one of claims 1 to 6, characterized in that the position of the strips of material (25, 26) in the direction transverse to the conveying direction (34) is controlled so that after shaping into a tubular strand (31) of the outer joint region (20 ), preferably the outer joint region (20) and the inner joint region (21) are aligned in the circumferential direction of the strand (31) with respect to an upper format of a formatting device (30), preferably the outer joint region (20) is aligned centrally below the upper format. Method according to one of claims 1 to 7, characterized in that the staggered merging of the first and the second strip of material (25, 26) an overlap region of the first and the second strip of material (25, 26) is generated, wherein the width of the overlap region on a constant value is maintained. Apparatus for producing at least two-ply tubular strands (31) of the tobacco processing industry comprising: a material strip feeding device (22), - A cutting device (23) comprising at least one knife (57), in particular at least one rotating circular knife, for longitudinal axial cutting a base material strip (24) in a first strip of material (25) having a first width and a second strip of material (26) with a second Width, - An actuator (52) for aligning the relative transverse adjustment, ie the orientation in the transverse direction (56), of the base material strip (24) with respect to the position of the at least one blade (57) whereby the cutting position and thereby the first and second widths are set, a measuring device (53) for measuring the width of the first material strip and / or of the second material strip, - A control device (55) to which the data of the measuring device (53) are fed or supplied and which is arranged so that it controls the actuator (52) so that the width of the measured strip of material to a predetermined or predetermined Value is controlled, a gluing device (27) by means of which the first material strip (25) or the second material strip (26) can be glued, - A merging device (28, 29) by means of which the material strips (25, 26) are guided together for bonding together so that the strips of material (25, 26) offset from each other are superimposed, and - A format device (30), in which from the merged material strips (25, 26), a tubular strand (31) is formed or can be produced. Apparatus according to claim 9, characterized in that the control device (55) is arranged to control the first width, wherein the first strip of material (25) the radially inner layer and the second strip of material (26) in Radial direction outer layer of the multilayer tubular strand (31) forms. Apparatus according to claim 10, characterized in that the formatting device (30) is arranged to form a tubular strand (31) from the merged material strips (25, 26) such that the edges (13, 14) defining the first width in particular, the control device (55) is arranged so that it calculates the outer diameter (51) of the tubular strand (31) for each of its set first width, and determines whether the calculated outer diameter (51) within one, in particular predefinable, tolerance range is. Apparatus according to claim 11, characterized in that it comprises a further measuring device (54), wherein said further measuring device (54) is adapted to determine the width of the base material strip (24), wherein the further measuring device (54) in particular in the conveying direction (34). is arranged in front of the actuator (52), wherein in particular the control or regulating device (55) is arranged so that it controls the first width, depending on the width of the base material strip (24), that the outer diameter (51) of the tubular Strangs (31) within the, in particular predefinable, tolerance range is varied so that the distance of the second width defining Edges (15, 16) after molding into a tubular strand (31) is minimized, in particular minimized so that the second width defining edges (15, 16) are in abutment. Apparatus according to claim 12, characterized in that the control or regulating device (55) is set up such that it calculates an outside of the, in particular predeterminable, tolerance range outside diameter (51) and / or one outside of another, in particular predeterminable, tolerance range lying distance of the second width defining edges (15, 16) outputs a warning message, in particular stops the device. Apparatus according to claim 12 or 13, characterized in that the control device (55) is adapted to perform a height adjustment of an upper format of the format device (30) in dependence on the calculated outer diameter (51) of the tubular strand (31). Device according to one of claims 9 to 14, characterized in that it comprises at least one edge sensor (59) for measuring the position of the strips of material (25, 26) in the direction transverse to the conveying direction (34) and at least one transverse displacement device (60) for displacing the position the material strip (25, 26) in the direction transverse to the conveying direction (34), wherein the at least one edge sensor (59) and the at least one transverse displacement device (60) between the cutting device (23) and the formatting device (30) are arranged.

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