EP2888952A2 - Embossing roller - Google Patents

Abstract

The invention relates to an embossing roller (34, 35) for an embossing device (36) of a device (30) for processing a wrapping material strip (33) for a rod-shaped article of the tobacco processing industry, wherein by means of the embossing device (36) the wrapping material strip (33) during a longitudinal axial promotion of the wrapping material strip (33) is embossable or embossed, wherein the embossing roller (34, 35) has an at least partially circumferential embossing geometry (42, 42 '), wherein the embossing geometry (42, 42') in the direction of a rotation axis (31 , 32) of the embossing roller (34, 35) alternately grooves (43, 43 ') and elevations (44, 44'). The invention is characterized in that a first distance (82) from at least two adjacent grooves (43, 43 ') is different from a second distance (83) from at least two other adjacent grooves (43, 43') and / or a third distance (84) from at least two adjacent bumps (44, 44 ') is different than a fourth distance (85) from at least two other adjacent bumps (44, 44').

Description

The invention relates to an embossing roll for an embossing device of a device for processing a wrapping material strip for a rod-shaped article of the tobacco-processing industry, wherein by means of the embossing device the wrapping material strip is embossable or embossed during a longitudinal axial promotion of the wrapping material strip, wherein the embossing roll has an at least partially circumferential embossing geometry wherein the embossing geometry of the embossing roller alternately has grooves and protrusions extending in the circumferential direction of the embossing roller.

Corresponding embossing rollers or a corresponding embossing device and also a device for processing a wrapping material strip for a rod-shaped article of the tobacco-processing industry are in the German application DE 10 2012 201 279 A1 described.

Recently, so-called combined performance filters (CP filters) have become known, which are also referred to as CV filters, where CV is the abbreviation of "channel ventilated".

The Chinese patent application CN 258802 Y discloses a groove filter manufacturing machine for making cigarette filter rods with diagonal grooves. Here, a paper feed on another side of a machine frame is doubled and provided as a paper feed a Spezialbobine, on the upper part of an embossing device is mounted. The embossing device has a double roller pair with diagonal groove embossing, a Saugluft- / Papierführungsnut, paper guide rollers and a Papierführungsnut and an infrared switch. It can be produced groove filter rods of different imprints. The double roller pair for embossing is convex-concave.

By the method that in the DE 10 2012 201 279 A1 can be embossed very exactly wrapping material strips. This method and the device used therefor will also be discussed below.

It is an object of the present invention to provide an embossing roller, an embossing device and a device for processing a wrapping material strip for a rod-shaped article of the tobacco processing industry, by means of which in particular transversely to the longitudinal axis of the wrapping material strip uniform embossing is achieved, in particular after embossing and a subsequent further processing of the embossed wrapping material strip is provided a uniform spacing in the embossed structure.

This object is achieved by an embossing roll for an embossing device of a device for processing a wrapping material strip for a rod-shaped article of the tobacco-processing industry, wherein by means of the embossing device the wrapping material strip is embossable or embossed during a longitudinal axial promotion of the wrapping material strip, wherein the embossing roll at least partially circumferential Stamping geometry, wherein the embossing geometry of the embossing roller alternately has grooves and protrusions extending in the circumferential direction of the embossing roller, which is further developed by a first distance of at least two adjacent grooves being different from a second distance of at least two other adjacent grooves; or that a third distance from at least two adjacent protrusions is different than a fourth distance from at least two other adjacent protrusions.

This measure according to the invention takes into account that a distribution of an embossing pattern on a wrapping material strip does not take place uniformly in the entire process of producing corresponding CV filters. In particular, it is desired to obtain a uniform embossing pattern in which equidistant grooves and equal-sized grooves are provided in the finished product. It has been found according to the invention that this desire is not met, in particular, if the embossing rollers have equidistant elevations or grooves, as in the course of further processing of the embossed wrapping material strip uneven tension or uneven pressure on the wrapping material strip, for example in the formation of a Filter rod, prevails, so that the embossed wrapping material strip is stretched differently. To counteract this, an embossing roll is provided, the different Having spaced grooves or differently spaced elevations. In other words, the first to fourth distances are preferably adapted to the further processing steps of the wrapping material strip. The embossing roll is adapted in this sense to the further processing steps.

Preferably, the distances change continuously.

Further preferably, the distances are given by adding a determined value to a mean distance, wherein the determined value is determined by a second degree polynomial and wherein the polynomial has a variable comprising a consecutive number of a number of juxtaposed grooves and / or protrusions equivalent. By this measure, a uniform spacing of elevations or grooves in the finished product, such as a filter rod can be achieved very targeted. How the distances are determined in an example will be described in more detail below.

Preferably, at least one groove and / or elevation in an outer region of the embossing geometry is more pronounced than a groove and / or elevation in an inner region of the embossing geometry.

Herein, it has been recognized that a well-developed and uniform embossing pattern of a wrapping material strip is enabled when an embossing roller is used for an embossing device whose embossing geometry is more pronounced at least at an outer area than at an inner area. In the case of a uniform shape, the effect otherwise results that the wrapping material strip at the edges of the wrapping material strip is separated from the lateral flanks or the lateral embossing geometry is not completely held, but the wrapping material strip is drawn into the embossing geometry, so that a less pronounced plastic deformation is made possible and the wrapping material strip after leaving the embossing device in the edge area expands again. By embossing roller according to the invention, a retraction of the wrapping material strip is prevented in the embossing geometry of the embossing roll.

A stronger expression of the embossing geometry is understood in particular to mean that the grooves and / or elevations are more pronounced in the radial direction of the embossing roller. Thus, in particular, the radius of a more pronounced groove is smaller than the radius of a less pronounced groove. Thus, in particular, the radius of a more pronounced elevation is greater than the radius of a less pronounced elevation. Here, the radius of the respective embossing roll is meant, so the distance from the axis of rotation of the embossing roller to the groove or the survey.

Preferably, the outermost groove and / or the outermost elevation of the embossing geometry of the embossing roll is more pronounced. In particular, the embossing geometry is correspondingly more pronounced at one edge of the embossing roll. The embossing geometry is preferably groove-shaped. Preferably, in each case the outermost groove and / or the outermost elevation is more pronounced on both sides of the embossing geometry. Thus, the embossing geometry is more pronounced on both outer edges or on both outer regions of the embossing roll.

It is particularly preferred if a plurality of grooves and / or elevations in the outer region of the embossing geometry are more pronounced. This can be very reliable pulling in across the Transport of the wrapping material strip in the embossing roller or the embossing geometry can be prevented. This happens because just in the outer area by the several grooves and / or elevations, which are more pronounced, a kind of clamping the wrapping material strip happens.

Preferably, at least two grooves and / or elevations, which are arranged side by side in the outer region, equally pronounced. This results in a very uniform embossed image of the wrapping material strip. Alternatively, a first enveloping curve for the grooves and / or a second enveloping curve for the elevations may be provided, which is at least partially parabolic. As a result, the projections of the embossing roller and / or the grooves of the embossing roller receive a kind of concave shape, with respect to the enveloping curve, i. an imaginary curve that connects the elevations or the uppermost part of the elevations and / or connects the grooves accordingly. Preferably, a stepwise enlargement of the expression of the grooves and / or the elevations in the outer region is provided to the outside, wherein at least two stages are provided.

Preferably, the grooves and / or the elevations are at least partially circular in section. As a result, the tension exerted on the wrapping material strip is evenly distributed. Preferably, the flanks between the grooves and the respective adjacent elevations are arranged radially. This results in a good clamping and thereby caused plastic deformation of the wrapping material strip. In particular, radial means that the flanks are arranged radially relative to the corresponding embossing roller or the axis of rotation of the embossing roller. The corresponding elevations and / or grooves surrounding are arranged around the embossing roller, thus have circumferential flanks between the respective elevations and the adjacent grooves, which are perpendicular to the axis of rotation.

Preferably, the groove and / or elevation are formed in the outer region of the embossing geometry between the flanks with a plateau, wherein between the plateau and the flanks a rounded edge is provided. Here a more intensive deformation of the wrapping material strip in the outer region of the embossing geometry is possible. Preferably, the embossing geometry is wavy in section, wherein in the inner region, the elevations and grooves have a kind of sinudial or sinusoidal configuration, that is, for example, circular segment-shaped and preferably formed in the outer region of a stump. This blunt formation may be understood to mean that the waveform is there in the manner of a rectangular waveform, but with rounded edges.

Preferably, an embossing device is provided with a first embossing roll, which is formed as described above, wherein a counter-roller is provided, which is complementary to the first embossing roll, wherein a gap of the flanks between the grooves and protrusions is provided, which is smaller than a thickness of wrapping material strip. This is the gap of the flanks between the grooves of an embossing roll and the elevations of the counter roll and vice versa. The axes of rotation of the two embossing rollers are preferably parallel to one another.

By providing a gap of the flanks between grooves and protrusions which is smaller than a thickness of the wrapping material strip, the wrapping material strip is interposed accordingly clamped the flanks, so that a plastic deformation of the wrapping material strip is made possible by the complementary shape provided grooves and projections in the radial direction of the embossing rollers.

Complementary in the sense of the invention is understood in particular that the grooves and elevations of the embossing roll and the grooves and elevations of the counter roll interlock, the gap dimensions, and in particular the horizontal gap dimensions, not necessarily the same size at each location or each survey or groove have to be. Rather, it is preferable if the horizontal gap between one side of a protrusion of the first embossing roll and a groove of the counter roll is different than on the other side of the elevation of the first embossing roll and the groove of the counter roll. Preferably, this ensures that a sufficient asymmetry is impressed into the wrapping material strip, which leads to a homogenization of the distances of the elevations or grooves which are embossed into the wrapping material strip by the further processing. This asymmetry in the gap dimension may preferably be provided only at some or a few locations or areas of the embossing roll or embossing rolls.

It is particularly preferred if, in a first outer region, a horizontal gap between one side of a protrusion of the first embossing roll and a groove of the counter-roller corresponds to a gap between an opposite side of a protrusion of the embossing roll and a groove of the counter-roll in the second outer region.

Preferably, the distance of the embossing rollers is adjustable.

Further preferably, an apparatus for processing a wrapping material strip for a rod-shaped article of the tobacco-processing industry comprises an embossing device described above and preferred by means of which the wrapping material strip is embossable or embossed during a longitudinal axial conveying of the wrapping material strip.

Embossing of the wrapping material strip now takes place in such a way that the wrapping material strip is conveyed between the embossing rolls of the embossing device in the longitudinal axial direction, while the embossing rolls, ie the first embossing roll and the counter-roll, which can also be an embossing roll according to the invention, rotate. As a result, a groove-shaped embossing is impressed on the wrapping material strip, wherein the grooves are formed in the conveying direction of the wrapping material strip.

In order to produce a rod-shaped article of the tobacco processing industry, a strand material, such as tobacco or filter material, such as filter tow, may be provided, which is processed accordingly in a stranding machine. In addition, then the embossed wrapping material strip can be wound around the strand, preferably on impact. In order to allow the strand to be wound up on impact, a very precisely defined width of the wrapping material strip has to be set. This is possible with the embossing roll according to the invention and the embossing device according to the invention in a simple manner. Another wrapping material strip may then be wrapped around the embossed wrapping material strip and appropriately glued. The further wrapping material strip may be the otherwise usual wrapping material strip which is wrapped around strand material in a formatting device and sealed accordingly to shape the strand material and keep it in shape.

The device for processing a wrapping material strip for a rod-shaped article of the tobacco processing industry accordingly provides an embossing device comprising one or two embossing roller (s) according to the invention, by means of which the wrapping material strip is embossed or embossed during a longitudinal axial conveying of the wrapping material strip, wherein upstream of the embossing device Moistening device for moistening the wrapping material strip may be provided.

Preferably, the moistening device is provided between a wrapping material strip tension control device and the embossing device. This development enables a very precise moistening of the wrapping material strip.

Preferably, a heating device is provided. The heating device is preferably arranged in the region of the embossing device and / or integrated in the embossing device. The heating device can be arranged for example in an embossing roll of the embossing device. Further preferably, a heater is provided upstream of the humidifier and / or integrated in the humidifier. Preferably, the moistening device sprays heated water or liquid onto the wrapper strip. Thus, a heating device is provided which heats the liquid to be sprayed onto the wrapping material strip.

Preferably, a drying device is provided immediately downstream of the embossing device, thereby allowing the wrapping material strip to be in contact with the strand material is dried or dried substantially.

Particularly preferred is a variant in which the device according to the invention is designed as a slide-in device or process unit of a slide-in device, the slide-in device being mounted or mountable between a filter rod machine and a filter tow preparation machine or a filter segment assembling machine for multi-segment filters, wherein the slide-in device comprises in particular a supply unit which cooperates with the process unit is releasably connectable.

With regard to this preferred embodiment of the device according to the invention is in particular on EP 2 591 686 A1 directed.

As a result of this preferred measure, the filter production is more flexible than hitherto possible, since the filter material and / or the wrapping material strip can be processed or processed very variably by the insertion device. By providing one or more slide-in devices, different processing or conditioning processes can also be provided, whereby a different type of processing or processing is made possible by exchanging the respective process unit with another process unit. Thus, it is also possible to change very quickly from the production of one type of filter to another type of filter, as a result of which the filter change can be designed very efficiently. For example, this measure can very quickly provide a different type of embossing on the wrapping material strip. According to the invention, for example, a longitudinal axial embossing is provided. However, other types of embossing could be provided, which are then possible on the corresponding insertion device or the process unit of a slide-in device. Further, another wrapping material may also be used be processed accordingly or the wrapping material easily processed or processed with another liquid at other process temperatures. For this purpose, for example, only the process unit must be replaced, which is then connected to the supply unit.

According to the invention, a filter manufacturing machine of the tobacco processing industry comprises an aforementioned device according to the invention with the corresponding aforementioned features.

The problem that the invention solves in particular is that the embossing pattern in a wrapping material strip is not distributed harmonically and evenly throughout embossing rolls having equidistant pitches of protrusions and grooves. This makes the finished product, such as a filter rod, optically not optimally appear to the outside, even if the parameters such as a mean groove surface or groove surface and a mean groove depth or groove depth, are met and they are also subject to only a slight variation.

The process of embossing and further processing the embossed wrapping material strip provides for uneven tension and uneven pressure on the paper in forming the wrapping material strip and the finished product, such as a filter rod. In addition, for example, the production of a filter rod by wrapping with the embossed wrapping material strip and another wrapping material strips in a format device. In particular, as in the case of an accordion, the individual lamellae or elevations and grooves of the embossing are displaced differently or provided with a different tensile force or pressure force, so that the distribution of the elevations and grooves on the circumference of the filter rod, which is provided with an embossed wrapping material strip is not uniform. To counter this problem, the distance of the embossing grooves or embossing grooves and embossing elevations of the embossing roller is not provided equidistant as previously, but there are some surveys or grooves of the distance to each other wider or larger or smaller provided. In particular, towards the edge of the embossing rollers, it is preferred if the distances become smaller. This results in a predistortion of the embossing, which is canceled out in a later further processing process so that a product which is homogeneously distributed in relation to the elevations and grooves arises. Thus, an embossing roll or embossing device adapted to the further process is specified, in which the grooves have a non-linear distance profile from the center of the embossing to the left and to the right. This distance course is preferably square.

The object is further achieved by a method of designing or manufacturing a second embossing roll corresponding to the embossing roll according to the invention described above, an embossing device of an apparatus for processing a wrapping material strip for a rod-shaped article of the tobacco processing industry, comprising the following steps: embossing the wrapping material strip with a first embossing roller, further processing the embossed wrapping material strip into a rod-shaped article of the tobacco processing industry, comparing an embossing pattern of the wrapping material strip after producing the rod-shaped article with a embossing geometry of the first embossing roll, based on deviations of the embossing pattern of the wrapping material strip from the embossing geometry of the first embossing roll Embossing geometry of a second embossing roll is adjusted.

The method according to the invention efficiently takes into account the change in the embossing pattern of the wrapping material strip during the further processing of the wrapping material strip after embossing, so that the further processing of the wrapping material strip by comparing the finished rod-shaped article and the then present embossing pattern in the wrapping material strip with the first embossing roll resulting deviations of the embossing pattern can be taken into account such that a second embossing roll is produced, which ensures that an embossed by the second embossing roll wrapping material strip after further processing into the finished product, such as a rod-shaped article in the tobacco processing industry desired embossed structure has, for example, equidistant distances between elevations and grooves.

It is thus preferably an adaptive method for constructing or producing a second embossing roller of an embossing device of an apparatus for processing a wrapping material strip for a rod-shaped article of the tobacco processing industry.

Preferably, larger distances between elevations in the embossing pattern in comparison to the distances between elevations of the embossing geometry of the first embossing roll lead to smaller distances between the elevations of the embossing geometry of the second embossing roll. If, for example, in the further processing of the wrapping material strip, distances between two elevations in the embossing pattern are increased, for example by a stretching of the wrapping material strip during further processing after embossing, by providing smaller distances between the elevations of the embossing geometry of the second embossing roll ensured that a wrapping material strip, which was embossed with the second embossing roll, after further processing, ie stretching, at this location has a distance between the elevations, which corresponds to a predetermined and desired distance.

Correspondingly, smaller distances between elevations in the embossing pattern compared to the distances between elevations of the embossing geometry of the first embossing roller can lead to larger distances between the elevations of the embossing geometry of the second embossing roller. This angle can also be used for grooves instead of the elevations.

Preferably, a fit is formed by the deviation or deviations, wherein the fit is preferably a second order polynomial dependent on a variable, the variable being a consecutive number of a number of juxtaposed grooves and / or protrusions, or wherein the variable is a distance of Grooves and / or elevations to a reference groove and / or a reference survey is.

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 Ansicht einer Filterherstellmaschine mit einer Vorrichtung zur Bearbeitung eines Umhüllungsmaterialstreifens,

Fig. 2

einen Ausschnitt aus einer erfindungsgemäßen Prägevorrichtung in einer schematischen Darstellung,

Fig. 3

einen schematischen Ausschnitt aus einer anderen Ansicht der beiden Prägewalzen aus Fig. 2,

Fig. 4

eine Schnittdarstellung eines Teils zweier erfindungsgemäßer Prägewalzen,

Fig. 5

einen Schnitt durch einen erfindungsgemäß hergestellten Filterstrang in schematischer Darstellung,

Fig. 6

einen Ausschnitt aus einer weiteren erfindungsgemäßen Prägevorrichtung in einer schematischen Darstellung,

Fig. 7

eine Schnittdarstellung eines Teils zweier weiterer erfindungsgemäßer Prägewalzen,

Fig. 8

eine schematische Darstellung eines abgewickelten Umhüllungsmaterialstreifens im Vergleich zu einer Prägegeometrie,

Fig. 9

eine schematische Schnittdarstellung eines Teils einer Prägewalze zur Veranschaulichung der Erfindung und

Fig. 10

ein schematisches Diagramm zur Berechnung einer Abstandsverzerrung von Erhebungen bzw. Nuten der Prägewalze.

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 view of a filter manufacturing machine with a device for processing a wrapping material strip,

Fig. 2

a detail of an embossing device according to the invention in a schematic representation,

Fig. 3

a schematic section of another view of the two embossing rollers Fig. 2 .

Fig. 4

a sectional view of part of two embossing rollers according to the invention,

Fig. 5

a section through a filter strand according to the invention in a schematic representation,

Fig. 6

a section of a further embossing device according to the invention in a schematic representation,

Fig. 7

a sectional view of part of two further embossing rollers according to the invention,

Fig. 8

a schematic representation of a developed wrapping material strip compared to a stamping geometry,

Fig. 9

a schematic sectional view of a portion of an embossing roller for illustrating the invention and

Fig. 10

a schematic diagram for calculating a distance distortion of elevations or grooves of the embossing roll.

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 schematically shows a filter manufacturing machine according to the invention of the tobacco processing industry with a very schematically illustrated Filtertowaufbereitungsmaschine 20, a device according to the invention for processing a wrapping material strip, for example in the form of the insertion device 30 and a filter rod machine 40, which is also shown very schematically. The processed filter tow 11 from the filter wire processing machine 20 is directed over rollers 61 above the web of wrapping material strip 33 of the wrapping material strip processing apparatus according to the invention and then threaded into an inlet hopper 41 of the filter rod machine.

A wrapping material strip 33 is fed from outside the insertion device or alternatively from a supply in the insertion device 30, which is not shown and may for example be a bobbin or a bobbin changer, via rolls 60 first to a wrapping material strip tensioning device 55, which ensures that the wrapping material strip as constant as possible predetermined tensile force is encouraged, steered. This is followed downstream of the wrapping material strip tensioning device 55 by a moistening device 50 in which the wrapping material strip 33 is moistened, for example with water, which is preferably mixed with a stabilizing agent, for example methyl cellulose. Upstream and / or downstream of the moistening device 50, a heater may be provided to heat the wrap strip of material. The heater can exploit heat radiation, for example, or hot air can be used here. When using methylcellulose as an additive, for example to water, the subsequent embossing is more stable. The moistening is preferably done so that the wrapping material strip 33 has a moisture content of 5 to 13 percent by mass, especially preferably 7 to 9 percent by mass and in particular 8 percent by mass, during embossing. Humidification happens in Fig. 1 one-sided from below. Particularly preferred is an embodiment in which the humidification from both sides, ie in addition to the embodiment of Fig. 1 , also happens from above.

The moistened wrapping material strip is then conveyed in the conveying direction 90 via deflecting rollers 60 to an embossing device 36. The embossing device 36 comprises an embossing roller 34 and an embossing roller 35, which will be explained in more detail below. As a result, preferably a longitudinal axial embossing of the wrapping material strip is achieved, i. an embossing, which shows a waveform in a section transverse to the longitudinal axis of the wrapping material strip.

In Fig. 1 In the embossing device 36, a heating device 56 is integrated, which heats the wrapping material strip, in particular further, by means of heat radiation, for example infrared radiation. It can also be a heater in one or both embossing rollers 34, 35 may be provided.

At least one embossing roll, in Fig. 1 the first embossing roll 34 is provided with a pivoting device 64, which in the case of a winder, a pivoting of an embossing roll from the other embossing roll allows. Preferably, two pivoting devices, ie for each embossing roller a pivoting device 64, are provided. The embossing rollers 34 and 35 may also be arranged linearly displaceable. Immediately following the embossing device 36, a drying device 51 is provided downstream, by means of which the embossed wrapping material strip 33 is dried. This is followed downstream by a guide 63, by means of which in particular a lateral guidance of the wrapping material strip is made possible so as to regulate the lateral position of the wrapping material strip, in particular relative to the lateral position of a further wrapping material strip 52.

The embossed wrapping material strip is then placed on a further wrapping material strip 52 in the stranding machine 40, and then wound in a format device, not shown, around the filter tow strip 11 in the format device.

The wrapping material strip 52 is glued on the adhesive side 53 by means of a gluing device 54. This results in a secure connection of the wrapping material strip 52 with the embossed wrapping material strip 33. The wrapping material strip 52 is correspondingly deflected by means of the deflecting roller 62.

By providing a wrapper strip tension control, which is exemplified in FIG Fig. 1 is referred to as Zugkrafteinstellvorrichtung 65, the wrapping material strip tension of the processed wrapping material strip 33 is set before the format infeed. In this embodiment, a force or spring-loaded emboss roller suspension is provided. Alternatively, a force or torque controlled dancer may be provided according to the configuration of the wrapping material strip tension control device 55 may be provided. Preferably, a wrapping material strip tension of 1 to 20 N, particularly preferably 2 to 15 N, further preferably 3 to 10 N, is maintained in the region upstream of the embossing device 36. In the area between the format inlet of the strand device 40 and the embossing device 36, the embossed wrapping material strip is kept as tension-free as possible by means of the tensile force adjusting device 65.

Alternatively, it can also be provided that no moistening takes place. The humidifying device 50 and also the heating device (s) may then be eliminated. This may be the case, for example, in the case of a wrapping material strip of cellulose fibers, which can be plastically and thus stably deformed without moistening by embossing.

Fig. 2 schematically shows in a side view, the first embossing roller 34 and the second embossing roller 35 of the embossing device 36. The wrapping material strip 33 is brought into the effective range of the two embossing rollers 34 and 35.

The embossing roller 34 has intermittently embossing areas 72 to 75. As a result, corresponding areas are stamped on the wrapping material strip 33 and corresponding areas are not embossed. These are each arranged alternately in the conveying direction.

The arrangement of the embossing rollers 34 and 35 is preferably reversed to that in Fig. 2 that is, the embossing roller 34 is then arranged below the embossing roll 35. The embossing roller 34 is thus disposed below the wrapping material strip barrel. Fig. 3 shows a section of the two embossing rollers 34 and 35 Fig. 2 in a representation from another side, in this case in Fig. 2 from the left looking at the two embossing rollers. Of the first embossing roller 34 of the embossing region 75 is clearly visible and another area 71, which does not contribute to the embossing. In the embossing area 75, the embossing roller is provided with a contour or stamping geometry which has elevations and grooves in alternation. The elevations have a radius r1 and the grooves have a radius r2. There are a total of five grooves shown and six surveys. Essentially complementary to the shape of the second embossing roller 35, which, however, has a full embossing area, so no intermittent embossed areas, which alternate with other areas 71. Again, corresponding grooves and projections are provided, wherein the elevations have a radius r4 and the grooves have a radius r3. The elevations of the embossing roller 34 engage in the grooves of the embossing roller 35 and vice versa engage the inner elevations of the embossing roller 35 in the grooves of the embossing roller 34 a.

The outer elevations of the embossing roller 35 frame in this embodiment, the outer elevations of the embossing roller 34 and are more pronounced, ie that the radius r4 of the outer elevations is greater than the radius r4 of the elevations in the inner region of the embossing roller 35. Due to the fact that the lateral distance the elevations of the embossing roll 34 to the embossing roll 35 is such that between the flanks of the protrusions less distance than the thickness of Umhüllungsmaterialstreifens that is to be embossed, the Umsüllungsstreifen strands between these flanks, which is why a retraction of the Umhüllungsmaterialstreifens at the edge of the wrapping material strip in the Inner area of the embossing rollers is prevented. This results in a more uniform embossing. In the context of the invention, the embossing roll 35 as the first Embossing roller can be understood and the embossing roll 34 as a counter roll.

It should be noted that the embossing roller 34 and the embossing roller 35 are spaced from each other so as not to contact each other so as to prevent damage to the wrapping material strip. Depending on the choice of wrapping material strip, this distance will be adjusted accordingly. It should also be noted that the radii used have no common divisors to minimize wear of the embossing rolls.

Fig. 4 schematically shows a sectional view in each case by a part of the embossing rollers 34 and 35. The embossing rollers 34 and 35 are shown only in the peripheral region, ie the area remote from the axis of rotation. In this embodiment, the projections 44 and 44 'and the grooves 43 and 43' each have semicircular portions. The grooves 43 pass over flanks 47 in the elevations 44 and the elevations 44 'go into the grooves 43' via flanks 47 'on. The flanks 47 and 47 'are arranged radially, ie perpendicular to the schematically illustrated axes of rotation 31 and 32, respectively. The axes of rotation are, for example, also in FIG Fig. 2 shown.

It is also a vertical gap 76 in Fig. 4 represented, which represents the distance between the two embossing rolls 34 and 35 and a horizontal gap 76 ', which corresponds to the spacing of the flanks 47 and 47'. The horizontal gap 76 'should be less than the thickness of the wrapping material strip to be embossed. The embossing geometry 42 of the embossing roll 35 and the embossing geometry 42 'of the embossing roll 34, which can also be generally referred to as embossing contour, provides that in an inner region 45 of the embossing rolls 34 and 35 comparatively small elevations and grooves are provided in the vertical direction. In addition, each are outer regions 46 and 46 'are provided, in which the formations of the elevations and grooves are more pronounced. The base of the grooves 43 is at an equal radius r3. The radius r3 is therefore the same over all areas. However, the elevations 44 have in the outer regions 46 and 46 'a greater expression than the elevations 44 in the inner region 45 of the roller 35. Thus, the outermost four elevations 44 are each more pronounced than the next two surveys, which in turn are more pronounced than the Elevations of the inner region 45 of the embossing roll 35. The embossing roll 34, whose grooves 43 'are more pronounced with respect to the elevations 44 of the embossing roll 35, behaves correspondingly in a complementary shape. Since the grooves 43 of the embossing roller 35 are equally pronounced, the elevations 44 'of the embossing roller 34 are equally pronounced, ie the radius r1 of the elevations of the embossing roller 34 is constant over the entire embossing roller 34, while the radius r2 of the embossing roller 34 in outer area is smaller than in the inner area.

In the manufacture of a so-called CV-filter, a wrapping material strip, for example a paper web, is embossed by an embossing roll with small contiguous grooves. The embossed paper or the embossed wrapping material strip is located in the later product, for example, between a filter tow and a filter wrapping paper, such as in Fig. 5 is shown. The edges of the embossed wrapping material strip lie next to each other and do not overlap. For this reason, the wrapping material strip should be embossed on the entire width. In the middle of the wrapping material strip this is held during the embossing process by the embossing teeth or stamping embossments located on both sides. Flow of the entire wrapping material strip is therefore not possible. The wrapping material strip is in the embossing mold or the embossing geometry forced and the fiber structure thereby plastically deformed. The result is a well-developed and solid embossed image. At the wrapping material strip edges, however, the wrapping material strip can not be held in place by lateral flanks in conventional embossing rolls. The consequence of this is a retraction of the wrapping material strip in the embossing or embossing rolls. As a result, the plastic deformation would be less pronounced, since the wrapping material strip expands back. To compensate for this effect, the embossing rollers are inventively shaped so that the embossing teeth or the embossing elevations or generally the elevations on both sides of the embossing roll or at least one embossing roll are higher, that is more pronounced than in the middle. The height change or the strength of the expression can be done in one, two or more steps. As a result, a concave shape can be formed in the overall picture of the embossing teeth or embossing elevations. The counter roller has correspondingly deeper grooves, so that the distances in the roll base to the counterparts remain the same.

According to the invention, therefore, an embossing roller or a pair of embossing rollers is indicated, which has an increasing embossing depth to the edge of the embossing roller.

Fig. 5 schematically shows a section through a manufactured filter strand. Filter material 110 is enclosed by the embossed wrapping material strip 33, which is wrapped around the filter material in abutment, resulting in a butting region 111. Wrapped around it and bonded to the wrapping material strip 33 is a wrapping material strip 52 corresponding to the usual wrapping material strip in a filter strand. Between the splices, ie the contact points of the two wrapping material strips 33 and 52 are provided corresponding longitudinal axial ventilation slots or ventilation areas.

Fig. 6 schematically shows in a side view a first embossing roller 34 'and a second embossing roller 35' of the embossing device 36 'in a slightly different embodiment compared with Fig. 2 , Again, the wrapping material strip 33 is brought into the effective range of the two embossing rollers 34 and 35. In contrast to the embossing rollers of the Fig. 2 the embossing rollers 34 'and 35' of Fig. 6 both intermittent imprinting areas 72 'to 75'. This has the advantage that a more defined embossing of the wrapping material strip is possible, in particular also in the transition region from an embossed region to an unembossed region.

Fig. 7 shows in a schematic sectional view in each case a part of the embossing rollers 34 and 35, which are designed somewhat different than that of Fig. 4 , The embossing rollers 34 'and 35' may also be used here Fig. 7 be shown.

In each case, an embossing geometry 42 or 42 'is shown, which may for example be referred to as wave-shaped. In the inner region 45, the grooves and elevations correspond to those of the Fig. 4 , Thus, partial circular elevations and grooves are also provided here. The stamping geometry 42 or 42 'now differs from that Fig. 4 known embossing geometry in that the two outermost grooves and the two outermost elevations are configured differently on average. These are namely formed in the outer region 46 to 46 'with plateaus 48, 48', wherein between the respective plateau 48, 48 'and the flanks 47, 47' a rounded edge 49, 49 'is provided. The radius of this rounded edge is smaller than the radius of the Transitions from one edge to the other flank at the elevations and grooves in the inner region 45. As a result, a more intense deformation of the wrapping material strip is achieved. In this embodiment, the two outer elevations and grooves are also more pronounced than in the inner region 45, ie the radii or extensions in the radial direction are larger here in the elevations compared to the radii or extensions in the radial direction of the elevations in the inner region 45 and in the grooves smaller compared to those of the inner area.

Fig. 8 schematically shows a unwound wrapping material strip 52 and in comparison an embossing geometry 42 of an equidistant embossing roll. The wrapping material strip 52 has been embossed by an equidistant embossing roller 42. There are raised portions 94 and not provided with reference numerals grooves or grooves in the wrapping material strip 52 as a dashed line to recognize. These have a different spacing than the elevations and grooves of the embossing geometry 42 of the embossing roll. In particular, the centers of the elevations of the embossing geometry are identified by the reference numeral 81 and corresponding center lines of the elevations of the wrapping material strip are identified by the reference numeral 80. These are approximately coincident in the middle of the stamping geometry 42 and identified as a reference elevation 91. The distances between the respective center lines 80 and 81 change to the left and to the right. This is due to a distortion in the further processing process. The wrapping material strip 52 embossed here is one wrapped in a finished filter around a filter material and correspondingly in FIG Fig. 8 is shown completed. It is thus a wrapping material strip of a manufactured filter in which the distances of the center lines 80 through the manufacturing process of the filter compared to the protrusions 81 of the embossing geometry 42nd distort.

In order to counteract this or to obtain a uniform embossed structure, an altered embossing geometry is now provided according to the invention. Fig. 9 shows only as an example a possible embossing geometry. There is shown an embossing roller 34 having corresponding projections 44 and grooves. The distances of the bumps 44, which are preferably measured from the centers 81 of the bumps to the centers 81 of adjacent bumps, are different. In particular, respective distances 84 and 85 are shown which are different from each other. This concerns the distances from adjacent surveys. The distances from adjacent grooves are indicated by the reference numerals 82 and 83, for example. These too can be different from each other. In the case of the produced wrapping material strip or the generated groove structure of the wrapping material strip 52 Fig. 8 However, the embossing geometry should be different than the in Fig. 9 be shown. In this case, the embossing geometry should be such that the desired distance is present in the center of the embossing roll and the distances between the elevations and the grooves change correspondingly to the edges towards the outside. For better illustration, the surveys are numbered consecutively from 1 to 10, with the further numbering omitted for the sake of clarity.

ergibt sich ein guter Fit 88 zu den dort in Fig. 10 gezeigten Messwerten 87. Die hierdurch berechneten Abweichungen werden für die Fertigung der Prägewalzen übertragen, so dass sich entsprechende Rillenabstände ergeben. Hierdurch wird eine Vorverzerrung in der Prägung des Umhüllungsmaterialstreifens durch die Prägewalze bzw. die Prägevorrichtung erzielt, die durch die Weiterverarbeitung, beispielsweise bei der Fertigung von Filtern der Tabak verarbeitenden Industrie, entfernt werden, so dass eine gleichmäßige Verteilung von Erhebungen und Nuten am Umfang des Filters entsteht.In order to calculate the deviations of the position or the distances of the elevations or grooves from the equidistant embossing structure 42 of the reference Fig. 8 allow now, the distances or the deviations of the distances of the actually produced wrapping material strip 52 from Fig. 8 measured. It will then for the corresponding surveys 1, 2, 3, etc. in the example of Fig. 10 up to the survey 8 the corresponding deviations plotted by a measurement curve 87 and fitted by a polynomial of the second degree. In this case, for example, it is attempted to lay a polynomial of the second degree through the measured values and in this case to provide the least possible square of errors. A corresponding fit 88 is in this example in the Fig. 10 already shown. The deviation from an equidistant distance is shown here by R. X is the number of the survey, ie 1, 2, 3, 4, etc. With the formula $$\mathrm{R}=-\mathrm{0}.\mathrm{0113}{\mathrm{<figure-callout\; id="2"\; label="X"\; filenames="imgf0002.png,imgf0006.png"\; state="\{\{state\}\}">X</figure-callout>}}^{\mathrm{2}}+\mathrm{0}.\mathrm{0678}\mathrm{X}$$

results in a good fit 88 to those in there Fig. 10 The measured values 87 thus calculated are transmitted for the production of the embossing rollers, so that corresponding groove distances result. As a result, a predistortion in the embossing of the wrapping material strip by the embossing roll or the embossing device is achieved, which are removed by further processing, for example in the manufacture of filters of the tobacco processing industry, so that a uniform distribution of projections and grooves on the circumference of the filter arises.

Out Fig. 10 It can be seen that first of all the right and left of a central elevation of the embossing roller, the distance between the elevations 1 to 4 increases by about 0.1 of the equidistant distance. The survey 6 has approximately the previously selected distance, ie the equidistant distance. The elevations 7 and 8 are arranged closer to each other.

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 can be fulfilled 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

1-10

Number of the survey

11

filter tow

20

Filtertowaufbereitungsmaschine

30

insertion device

31

axis of rotation

32

axis of rotation

33

Wrapping material strip

34, 34 '

first embossing roll

35, 35 '

second embossing roll

36, 36 '

embosser

40

Filter rod machine

41

feed hopper

42, 42 '

embossing geometry

43, 43 '

groove

44, 44 '

survey

45

inner area

46, 46 '

outer area

47, 47 '

flank

48, 48 '

plateau

49, 49 '

rounded edge

50

humidifying

51

drying device

52

Wrapping material strip

53

adhesive side

54

gluing device

55

Umhüllungsmaterialstreifenzugregelungsvorrichtung

56

heater

60

idler pulley

61

idler pulley

62

idler pulley

63

guide

64

swivel device

65

tension adjuster

71

another area

72, 72 '

stamping area

73, 73 '

stamping area

74, 74 '

stamping area

75, 75 '

stamping area

76

vertical gap

76 '

horizontal gap

80

Centerline elevation of serving strip of material

81

Middle elevation

82

first distance

83

second distance

84

third distance

85

fourth distance

86

Middle groove

87

readings

88

Fit

90

longitudinal axial conveying direction

91

reference collection

94

Collection of wrapping material strip

100

conveying direction

110

filter material

111

joint area

r1, r2, r3, r4

radius

Claims (15)

An embossing roll (34, 35) for an embossing device (36, 36 ') of a device (30) for processing a wrapping material strip (33, 52) for a rod-shaped article of the tobacco processing industry, wherein the wrapping material strip is produced by means of the embossing device (36, 36') (33, 52) is embossable or embossed during a longitudinal axial conveying of the wrapping material strip (33, 52), wherein the embossing roll (34, 35) has an embossing geometry (42, 42 ') running around at least in portions, wherein the embossing geometry (42, 42 ') of the embossing roll (34, 35) alternately grooves (43, 43') and protrusions (44, 44 ') extending in the circumferential direction of the embossing roll (34, 35), characterized in that a first distance (82) is at least two adjacent grooves (43, 43 ') different from a second distance (83) of at least two other adjacent grooves (43, 43') and / or that a third distance (84) of at least two adjacent bumps (44, 44 ') is different from a fourth distance (85) from at least two other adjacent bumps (44, 44'). Embossing roller (34, 35) according to claim 1, characterized in that the distances (82-85) are given by addition of a determined value to a mean distance, the determined value being determined by a second degree polynomial, the polynomial being a variable having a consecutive number (1-10) of a number of juxtaposed grooves (43, 43 ') and / or protrusions (44, 44') corresponds. Embossing roller (34, 35) according to claim 1 or 2, characterized in that at least one groove (43, 43 ') and / or elevation (44, 44') in an outer region (46, 46 ') of the embossing geometry (42, 42 ') is more pronounced than a groove (43, 43') and / or elevation (44, 44 ') in an inner region (45) of the embossing geometry (42, 42'), wherein in particular on both sides of the embossing geometry ( 42, 42 ') in each case the outermost groove (43, 43') and / or outermost elevation (44, 44 ') are more pronounced. Embossing roller (34, 35) according to claim 3, characterized in that a plurality of grooves (43, 43 ') and / or elevations (44, 44') in the outer region (46, 46 ') of the embossing geometry (42, 42') stronger are pronounced, in particular at least two grooves (43, 43 ') and / or elevations (44, 44'), which are arranged side by side in the outer region (46, 46 ') are equally pronounced. Embossing roller (34, 35) according to claim 4, characterized in that in that a first enveloping curve is provided for the grooves (43, 43 ') and / or a second enveloping curve is provided for the elevations (44, 44') which is parabolic at least in sections. Embossing roll (34, 35) according to one of claims 1 to 5, characterized in that the grooves (43, 43 ') and / or the elevations (44, 44') are at least partially circular in section, in particular the flanks (47 , 47 ') between the grooves (43, 43') and each of the grooves (43, 43 ') adjacent elevations (44, 44') are arranged radially. Embossing roller (34, 35) according to one of claims 3 to 6, characterized in that the groove (43, 43 ') and / or elevation (44, 44') in the outer region of the embossing geometry (42, 42 ') between the flanks thereof (47, 47 ') are formed with a plateau (48, 48') or is, wherein between the plateau (48, 48 ') and the flanks (47, 47') has a rounded edge (49, 49 ') is provided , Embossing device (36) with a first embossing roller (35) according to one of claims 1 to 7, wherein a counter-roller (34) is provided which is complementary in shape to the first embossing roller (35), wherein a gap (76 ') of flanks (47, 47 ') between the grooves (43, 43') and protrusions (44, 44 ') is provided, which is smaller than a thickness of the wrapping material strip (33). Embossing device (36, 36 ') according to claim 8, characterized in that the horizontal gap (76') between one side of a protrusion (44) of the first embossing roller (35) and a Groove (43 ') of the counter roll (34) is different than on the other side of the elevation (44) of the first embossing roll (35) and the groove (43') of the counter roll (34). Embossing device (36, 36 ') according to claim 8 or 9, characterized in that in a first outer region (46) a horizontal gap (76') between one side of a protrusion (44) of the first embossing roller (35) and a groove ( 43 ') to the counter roll (34) has a horizontal gap (76') between an opposite side of a protrusion (44) of the embossing roll (35) and a groove (43 ') of the counter roll (34) in the second outer region (46'; ) corresponds. Embossing device (36, 36 ') according to one of claims 8 to 10, characterized in that the distance (76) of the embossing rollers (34, 35') is adjustable. An apparatus (30) for processing a wrapping material strip (33, 52) for a rod-shaped article of the tobacco processing industry, wherein an embossing device (36) according to any one of claims 8 to 11 is provided, by means of which the wrapping material strip (33, 52) during a longitudinal axial Promotion of the wrapping material strip (33, 52) is embossed or embossed. Method for constructing or producing a second embossing roll (34, 35), in particular according to one of claims 1 to 7, embossing device (36, 36 ') of an apparatus for processing a wrapping material strip (33, 52) for a rod-shaped article of the tobacco processing industry with the following process steps: Embossing the wrapping material strip (33, 52) with a first embossing roller (34, 35), Further processing the embossed wrapping material strip (33, 52) into a rod-shaped article of the tobacco processing industry, Comparing an embossing pattern of the wrapping material strip (33, 52) after producing the bar-shaped article with an embossing geometry (42, 42 ') of the first embossing roll (34, 35) based on deviations of the embossing pattern of the wrapping material strip (33, 52) from the embossing pattern Embossing geometry (42, 42 ') of the first embossing roll (34, 35) an embossing geometry (42, 42') of a second embossing roll (34, 35) is adjusted. A method according to claim 13, characterized in that larger distances between elevations (94) in the embossing pattern in comparison to the distances between elevations (44, 44 ') of the embossing geometry (42, 42') of the first embossing roller (34, 35) to smaller distances between the elevations (44, 44 ') of the embossing geometry (42, 42') of the second embossing roller (34, 35). Method according to claim 13 or 14, characterized in that a fit (88) is formed by the deviations, wherein in particular the fit (88) is a polynomial of the second degree as a function of a variable, the variable being a consecutive number (1-10) of a number of juxtaposed grooves (43, 43 ') and / or protrusions (44, 44'), or wherein the variable is spaced from grooves (43, 43 ') and / or protrusions (44, 44') a reference groove and / or a reference survey (91).

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