DE102017114910A1 - Method for producing hollow tubes of the tobacco processing industry and format device - Google Patents

Abstract

The invention relates to a method for producing hollow tubes (11) of the tobacco-processing industry with the following method steps: conveying at least one flat material strip (3), which has a longitudinal extent, in a longitudinal axial direction (10) to form a format device (14) - applying the at least one strip of material (3) to a format strip (4) of the format device (14), wherein the format strip (4) is moved in the longitudinal axial direction (10) and arranged on a format strip guide surface (15), - preforming the strip at least one strip of material (3) in an inlet region (16) of the format device (14) by means of a rotary device (2), the rotary device (2) exerting pressure on the at least one strip of material (3) and the format strip (4) Preforming a Vorrümmen the at least one strip of material (3) in a direction transverse to the longitudinal extent of the at least one strip of material (3) and forming the at least one strip of material (3) into a hollow tube (11). The invention further relates to a format device of the tobacco processing industry.

Description

The invention relates to a method for producing hollow tubes of the tobacco-processing industry and to a format device for an extrusion machine of the tobacco-processing industry, wherein the format device is adapted to form at least one flat-shaped strip of material, which is guided longitudinally through the format device to form a hollow tube, comprising a top format and a sub-format, the sub-format having a format tape guide surface, and comprising a format tape guided or guided along the format tape guide surface by the format device.

In the tobacco processing industry, tubes or hollow tubes, for example of cardboard or paper, are used to provide, for example, special filters, such as recessed filters or hollow filters. In addition, such tubes, which are cut to length from hollow tubes, also serve 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 or hollow 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a continuous strip of paper whose width is at least twice the circumference of the tube to be produced, is continuously withdrawn from a roll, the strip in the longitudinal direction by weaknesses with a Folding line is provided, by which the strip is divided into two strip portions,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. A connection of the ends of the paper strip is made by overlapping or underlapping the paper strip with the folded and bent edge.

DE 10 2014 226 019 A1 shows a double-layered tube of the tobacco processing industry, a device for producing such a tube and a method for producing double-layered tubes, wherein two staggered and bonded material strip portions are provided, which are conveyed by a format device, thereby formed into a hollow tube and be formed by overlapping side portions to a hollow tube, in which case the edges of the strips of material are in abutment. As a result, a very good roundness of the produced double-layered tube of the tobacco processing industry is possible.

To produce the tube, an endless hollow tube is first produced in a format device that is part of a stranding machine. For this purpose, a format tape is used, which is guided by a format device. The format strip serves as a means of transport for the material strip sections, which are stacked and glued together. Since there is no material in the hollow tube, such as a filter material that presses outward, only little internal pressure can be exerted on components of the format device such as an upper format or a lower format or the format band. As a result, a slip can arise, which can be problematic for a quality according to produced hollow tubes. In particular, when there is already a slip, problems may occur because, as is known, the static friction is usually greater than a sliding friction.

It is therefore an object of the present invention, in the production of hollow tubes of the tobacco-processing industry to provide a method and a device by means of which an improved quality of the hollow tubes is made possible. In particular, slippage during transport of the material strip to be formed into a hollow tube to form a format strip of a format device should be avoided.

• - Fördern wenigstens eines flächig ausgebildeten Materialstreifens, der eine Längserstreckung hat, in einer längsaxialen Richtung zu einer Formatvorrichtung,
• - Aufbringen des wenigstens einen Materialstreifens auf ein Formatband der Formatvorrichtung, wobei das Formatband in der längsaxialen Richtung bewegt wird und auf einer Formatbandführungsfläche angeordnet ist,
• - Vorformen des wenigstens einen Materialstreifens in einem Einlaufbereich der Formatvorrichtung mittels einer Drehvorrichtung, wobei die Drehvorrichtung einen Druck auf den wenigstens einen Materialstreifen und das Formatband ausübt, wobei das Vorformen ein Vorkrümmen des wenigstens einen Materialstreifens in einer Richtung quer zur Längserstreckung des wenigstens einen Materialstreifens umfasst, und
• - Formen des wenigstens einen Materialstreifens zu einem Hohlrohr.

This object is achieved by a method for producing hollow tubes of the tobacco-processing industry with the following method steps:

• Conveying at least one flat material strip, which has a longitudinal extent, in a longitudinal axial direction to a format device,
• Applying the at least one strip of material to a format strip of the format device, wherein the format strip is moved in the longitudinal axial direction and is arranged on a format strip guide surface,
• Preforming the at least one strip of material in a lead-in area of the format device by means of a rotary device, the rotary device exerting pressure on the at least one strip of material and the format strip, wherein the pre-forming comprises pre-blanking the at least one strip of material in a direction transverse to the longitudinal extent of the at least one strip of material , and
• - Forming the at least one strip of material to a hollow tube.

By preforming the at least one strip of material in the inlet region of the format device by means of a turning device, wherein the rotating device exerts a pressure on the at least one strip of material and the format strip, it is ensured that the format tape safely entrains the at least one strip of material so that no slippage or only minimal slippage occurs in the format device. Preforming the at least one strip of material ensures that a larger area of the strip of material comes into contact with the format strip so as to ensure that in the format device the at least one strip of material adheres to the strip by means of stiction.

Preferably, a distance of the rotary device to the format band guide surface, in particular as a function of a first thickness of the at least one strip of material and a second thickness of the format strip set. This ensures that sufficient pressure is exerted by the rotating device on the at least one strip of material and the format strip.

Preferably, the distance of the rotary device to the format band guide surface in the operation of a strand machine of the tobacco-processing industry, in particular automatically adjusted. As a result, it can be ensured even with wear, for example of the format band, that hollow tubes of high quality can be produced.

Preferably, the pressure which the rotary device exerts on the at least one strip of material and the format strip, in particular constant, is set.

Preferably, the first thickness of the at least one strip of material and / or the second thickness of the format strip is measured, wherein the distance of the rotary device is adjusted to the format band guide surface depending on the measured first thickness and / or second thickness. In this way, the distance of the rotary device to the format band guide surface can be adjusted automatically during operation of a stranding machine.

Preferably, two transverse to the longitudinal axis offset merged and bonded with an adhesive material strip are formed into a hollow tube. As a result, for example, a hollow tube or a double-layered tube of the tobacco-processing industry can be produced with very high quality. It can be provided that a strip of material as in DE 10 2014 226 019 A1 is first cut longitudinally axial, is provided with adhesive and is brought together offset in the direction transverse to the longitudinal axis, so that a double-layered material strip is fed to the format device. The hollow tube can then be designed so that the lateral edges of the material strips are arranged in abutment in the hollow tube or have only a small distance from each other. In this way, an improved roundness of the hollow tube produced is possible. The cross section of the hollow tube may be circular or oval at the end. Depending on which shape is desired, the format device is to be formed.

It is particularly preferred if the at least one strip of material is a rigid paper, in particular filter paper.

The object is further achieved by a format device for a strand machine of the tobacco-processing industry, wherein the format device is adapted to form at least one flat-shaped strip of material, which is guided longitudinally through the format device to form a hollow tube, comprising a top format and a sub-format, wherein the sub-format comprises a format tape guide surface, and comprising a format tape guided or guided along the format tape guide surface by the format device, which is further developed by providing a turning device in an inlet region of the format device, which is used to preform the at least one flat material strip into engagement with the standing at least one strip of material and the at least one strip of material is designed to be pressed against the format strip. The format device according to the invention ensures that a slip between the at least one flat material strip is minimized to the format band.

Preferably, the rotating device has a peripheral surface which has a curve. The rotating device is in this case for example designed as a cylinder, which is rounded at the radial peripheral surface, for example, is formed in a circular section.

Preferably, the rotating device is a roller.

Preferably, the distance of the rotary device to the format band guide surface is adjustable and / or a pressing device is provided, which presses the rotary device with a, in particular adjustable, compressive force against the format band guide surface. The pusher may be a device which, by spring loading, presses the rotating device against the size tape guide surface, the at least one strip of material, the size tape, and at the end the size tape guide surface. The distance of the rotary device to the format band guide surface is preferably such that it corresponds to the thickness of the at least one strip of material plus the thickness of the format strip or is slightly smaller.

Particularly preferably, the peripheral surface of the rotary device is complementary to the shape The size tape guide surface or the shape of the roller or the shape of the peripheral surface of the roller correspond to the negative shape of the size tape guide surface at the position where the rotary device is arranged in the format device.

Preferably, in the conveying direction of the at least one strip of material, downstream of the rotary device, a holding-down device acts from above on the at least one strip of material. As a result, the formation of the hollow tube is largely supported, for example, as far as the upper format of the format device is not closed up.

According to the invention, a stranding machine of the tobacco-processing industry is provided with a format device according to the invention. To allow rigid filter paper for tube base filters or hollow tubes to be taken without slippage from the format strip and preformed in the radius, a roll arranged in the format inlet of a format device is pressed directly onto the format strip in a format base. As a result, very high-quality hollow tubes, in particular filter hollow tubes or hollow filter tubes, can be produced. This is particularly efficient when an endless strand in the form of a hollow tube is to be produced, in which no or only little internal pressure can be generated on cover and support strips of a format device. The cover strips are hereby preferably part of an upper format of a format device and the support strips may be part of the upper format but also of the lower format.

By using a corresponding rotating device or roller, which presses on the strip of material, in an inlet region or an inlet chamber of the format device, a corresponding normal force is provided on the strip of material, so that it can be taken without slippage by a format of the format device.

The shape of the rotary device or the roller preferably corresponds to a negative mold of the inlet chamber or a format band guide surface of the format device, namely at the location where the rotary device is arranged. The distance of the tread of the rotating device which contacts the wrapping material strip should preferably be up to a thickness of the format strip plus the thickness of the strip or strips of material.

In order to ensure a take-along even with a wear of the format strip, the rotating device can be mounted so that a defined force acts on the format strip and the rotating device maintains a constant pressure, even if the format strip is narrower or decreases in thickness.

The inventive method and the format device according to the invention can be used in single-strand, two-strand or multi-strand machines.

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 zeigt schematisch eine Ansicht einer erfindungsgemäßen Formatvorrichtung,
• 2 zeigt eine schematische Schnittdarstellung durch die erfindungsgemäße Formatvorrichtung im Einlaufbereich,
• 3 zeigt ein entsprechendes Bild wie 2 ohne Materialstreifen und ohne Formatband,
• 4 zeigt schematisch eine dreidimensionale Darstellung eines vorderen Teils einer Formatvorrichtung.

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 shows schematically a view of a formatting device according to the invention,
• 2 shows a schematic sectional view through the inventive format device in the inlet region,
• 3 shows a corresponding picture like 2 without strips of material and without format tape,
• 4 schematically shows a three-dimensional representation of a front part of a formatting device.

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 formatting device according to the invention 14 comprising a sub-format 1 and an upper format 5 , The format device 14 also has a format tape 4 endlessly through the format device 14 is moved, in the lower area opposite to the conveying direction 10 of the material strip 3 in the format device 14 and in the upper area, ie between the lower and the upper format in the conveying direction 10 ,

A strip of material 3 , which may be, for example, a simple strip of material or a double strip of material, ie a strip of material having two strips of material, which are superimposed offset and glued with an adhesive, is in an inlet region 16 the format device 14 on the format tape 4 put on and with a turning device 2 , which may be formed as a roll, via a spring 12 or one Pressing device, which may be designed to be spring-loaded, on the format tape 4 pressed. This results in a preforming of the strips of material 3 ,

Subsequently, the strips of material 3 through the other part of the format device 14 guided and to a hollow tube 11 educated.

In the case of only one strip of material 3 can be used immediately after the format device 14 or at the end of the format device 14 an adhesive strip is applied to the seam or the hollow tube 11 be formed so that an overlap of the material strip 3 is provided, which is glued. In the provision of two transversely arranged one above the other superposed strips of material 3 like this example in the DE 10 2014 226 019 A1 discloses is a hollow tube 11 formed, which has a very good roundness.

2 shows a sectional view through the embodiment according to 1 , where the cut in the inlet area 16 the format device 14 , in particular by the rotating device 2 , was carried out.

The turning device 2 turns around the rotation axis 13 and press on the two strips of material shown there 3 extending in a direction transverse to the longitudinal axis of the strips of material 3 staggered to each other and on the format tape 4 are stored. The format tape 4 is passed through a format tape guide surface 15 , in the 3 is better shown, the sub-format 1 guided. The contact surface or peripheral surface 6 the turning device 2 , which may be formed as a roll, is complementary to the shape or substantially complementary to the format tape guide surface 15 To ensure efficient preforming of the material strip or strips 3 to enable.

Preferably, the distance X who in 3 is shown, from the peripheral surface 6 to the format tape guide surface 15 be set.

4 shows a schematic three-dimensional representation of part of a formatting device according to the invention 14 , In the inlet area 16 is the turning device 2 represented in the form of a roll. This can be done by an operator in the effective area with one or more strips of material 3 and the format tape 4 be swung. Immediately following the turning device 2 is a hold-down 17 provided to the preforming of the material strip 3 to support. The hold down 17 can in 4 to the left in the format device 14 be continued to the shaping of the material strip 3 also in the area where the upper format 5 already closed up, continue to support. At least the hold-down serves 17 in the area where the upper format 5 not yet closed up, to hold down the strip of material 3 ,

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

under format

2

rotator

3

strips of material

4

format tape

5

upper format

6

peripheral surface

10

conveying direction

11

hollow tube

12

feather

13

axis of rotation

14

format device

15

Format ribbon guide surface

16

inlet region

17

Stripper plate

X

distance

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]
• DE 102014226019 A1 [0004, 0013, 0032]

Claims (13)

Method for producing hollow tubes (11) of the tobacco processing industry with the following method steps: Conveying at least one flat material strip (3), which has a longitudinal extent, in a longitudinal axial direction (10) to a formatting device (14), - applying the at least one strip of material (3) on a format strip (4) of the format device (14), wherein the format strip (4) in the longitudinal axial direction (10) is moved and arranged on a format band guide surface (15), - Preforming the at least one strip of material (3) in an inlet region (16) of the format device (14) by means of a rotating device (2), wherein the rotating device (2) exerts a pressure on the at least one strip of material (3) and the format strip (4) wherein the preforming comprises pre-crimping the at least one strip of material (3) in a direction transverse to the longitudinal extent of the at least one strip of material (3), and - Forming the at least one strip of material (3) to a hollow tube (11). Method according to Claim 1 , characterized in that a distance (X) of the rotary device (2) to the format band guide surface (15), in particular in dependence on a first thickness of the at least one strip of material (3) and a second thickness of the format strip (4) is adjusted. Method according to Claim 2 , characterized in that the distance (X) of the rotating device (2) to the format band guide surface (15) in the operation of a strand machine of the tobacco-processing industry, in particular automatically, is set. Method according to Claim 2 or 3 , characterized in that the first thickness of the at least one strip of material (3) and / or the second thickness of the format strip (4) is measured, wherein depending on the measured first and / or second thickness of the distance (X) of the rotary device (2) to the format tape guide surface (15) is set. Method according to one of Claims 1 to 4 , characterized in that two transverse to the longitudinal axis merged and bonded with an adhesive material strip (3) are formed into a hollow tube (11). Method according to one of Claims 1 to 5 , characterized in that the at least one strip of material (3) is a rigid paper, in particular filter paper. A format device (14) for an extrusion machine of the tobacco processing industry, wherein the formatting device (14) is adapted to form at least one flat material strip (3), which is guided longitudinally through the formatting device (14) to form a hollow tube (11), comprising an upper format (5) and a lower format (1), the lower format (1) comprising a format tape guide surface (15), and comprising a format tape (4) guided or guided along the format tape guide surface (15) by the format apparatus (14), characterized in that in an inlet region (16) of the format device (14) a rotating device (2) is provided for the preforming of the at least one flat material strip (3) in engagement with the at least one strip of material (3) standing and the at least one Material strip (3) to the format strip (4) is formed depressing. Format device (14) after Claim 7 , characterized in that the rotating device (2) has a peripheral surface (6) which has a rounding. Format device (14) after Claim 7 or 8th , characterized in that the distance (X) of the rotary device (2) to the format band guide surface (15) is adjustable and / or a pressing device (12) is provided which the rotating device (2) with a, in particular adjustable, compressive force against the format band guide surface (15) presses. Format device (14) after Claim 8 or 9 , characterized in that the peripheral surface (6) of the rotary device (2) is complementary to the format band guide surface (15). Format device (14) according to one of Claims 7 to 10 , characterized in that the rotating device (2) is a roller. Format device (14) according to one of Claims 7 to 11 , characterized in that in the conveying direction (10) of the at least one strip of material (3) downstream of the rotating device (2) from the top of the at least one strip of material (3) acting down device (17) immediately adjoins. Extrusion machine of the tobacco processing industry with a format device (14) according to one of Claims 7 to 12 ,

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