DE102013223076A1 - 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 roll (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 roller is provided which has differently 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, the determined value being determined by a second degree polynomial and wherein the polynomial has a variable which is a consecutive number of a number of juxtaposed grooves and / or surveys corresponds. 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 not completely retained by the lateral flanks or the lateral embossing geometry, 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 expands back after leaving the embossing device in the edge region. 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 prevented very reliably pulling in transversely to the transport of the wrapping material strip in the embossing roller or the embossing geometry. 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, which are arranged circumferentially 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 a kind sinudiale or Sinusoidal configuration, ie, for example, are circular section-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 clamped between the flanks, so that plastic deformation of the wrapping material strip is made possible by the shape complementarily provided grooves and elevations in the radial direction of the embossing rolls ,

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 and retain the strand material.

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 dried or substantially dried in contact with the strand material.

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. Furthermore, another wrapping material can be processed accordingly or the wrapping material can be easily processed or processed with another liquid even 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 with an accordion, the individual lamellae or elevations and grooves of the embossing are displaced differently or provided with a different tensile force or compressive 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 even. 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 creates a predistortion of the embossing, which is repealed in a subsequent further processing process so that a homogeneous with respect to the elevations and grooves distributed product. 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 a device 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 roll, 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 spacings between two elevations in the embossing pattern are increased, for example by stretching the wrapping material strip during further processing after embossing, provision of smaller spacings between the elevations of the embossing geometry of the second embossing roll ensures that a wrapping material strip , which was embossed with the second embossing roll, after further processing, ie the stretching, at this location has a distance between the surveys, 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.

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

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

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

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

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

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

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

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

8th a schematic representation of a developed wrapping material strip compared to a stamping geometry,

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

10 a schematic diagram for calculating a distance distortion of protrusions or grooves of the embossing roller.

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 schematically shows a filter manufacturing machine of the tobacco processing industry according to the invention with a very schematically illustrated filter tow preparation machine 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 recycled filter tow 11 from the filter tuyer preparation machine 20 is about roles 61 above the path of the wrapping material strip 33 the wrapping material strip processing device according to the invention and then into an inlet funnel 41 threaded or introduced the filter rod machine.

A serving strip of material 33 is from outside the insertion device or alternatively from a supply in the insertion device 30 which is not illustrated and may be, for example, a reel or a reel changer, via rollers 60 first to a wrapping material strip tensioning device 55 , which ensures that the wrapping material strip is conveyed with the most constant predetermined tensile force, steered. This is followed downstream of the wrapping material strip tensioning device 55 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 humidifier 50 For example, 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 a moisture content of 5 to 13 mass%, particularly preferably 7 to 9 mass% and especially 8 mass%, when embossing. Humidification happens in 1 one-sided from below. Particularly preferred is an embodiment in which the humidification from both sides, ie in addition to the embodiment of 1 , also happens from above.

The moistened wrapping material strip is then in the conveying direction 90 over pulleys 60 to an embossing device 36 promoted. The embossing device 36 includes an embossing roll 34 and an embossing roll 35 , which will be explained in more detail below. As a result, preferably a longitudinal axial embossing of the wrapping material strip is achieved, ie an embossing, which shows a waveform in a section transverse to the longitudinal axis of the wrapping material strip.

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

At least one embossing roll, in 1 the first embossing roll 34 , is with a swivel device 64 provided, which allows in the case of a winder pivoting an embossing roll from the other embossing roll. Preference is given to two pivoting devices, ie a swiveling device for each embossing roller 64 , intended. The embossing rollers 34 and 35 can also be arranged linearly displaceable. Immediately following the embossing device 36 downstream is a drying device 51 provided by means of the embossed wrapping material strip 33 is dried. This is followed by a guide downstream 63 by means of which, in particular, a lateral guidance of the wrapping material strip is made possible, in order thus to ensure the lateral position of the wrapping material strip, in particular relative to the lateral position of another Wrapping material strip 52 to regulate or control.

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

The wrapping material strip 52 gets on the glue side 53 by means of a gluing device 54 glued. 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 by means of the pulley 62 redirected accordingly.

By providing a wrapper strip tension control, which is exemplified in FIG 1 as tensile force adjuster 65 is designated before the Forminlauf the wrapping material strip tension of the processed wrapping material strip 33 set. 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 be provided. Preferably, a wrapping material strip tension of from 1 to 20 N, more preferably from 2 to 15 N, further preferably from 3 to 10 N, in the region upstream of the embossing device 36 respected. In the area between the format inlet of the strand device 40 and the embossing device 36 is by means of the tension adjuster 65 the embossed wrapping material strips kept as free of tension as possible.

Alternatively, it can also be provided that no moistening takes place. The moistening device 50 and also the heater or heaters may then be eliminated. This can 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.

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

The embossing roller 34 has intermittent embossed areas 72 to 75 on. This will be on the wrapping material strip 33 shaped corresponding areas and did not shape corresponding areas. These are each arranged alternately in the conveying direction.

The arrangement of embossing rollers 34 and 35 is preferably reversed to the in 2 represented, ie the embossing roll 34 is then below the embossing roll 35 arranged. The embossing roller 34 is thus arranged below the wrapping material strip run.

3 shows a section of the two embossing rollers 34 and 35 out 2 in a representation from another side, in this case in 2 from the left looking at the two embossing rollers. From the first embossing roll 34 is the stamping area 75 good to recognize and another area 71 that does not contribute to the imprint. In the stamping area 75 the embossing roll is provided with a contour or embossing geometry, which has alternately elevations and grooves. 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 this is the second embossing roll 35 , which, however, has a full embossing area, ie no intermittent embossed areas, which are integrated with other areas 71 alternate. 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 roll 34 engage in the grooves of the embossing roller 35 One and the other way round, the inner elevations of the embossing roller grip 35 into the grooves of the embossing roll 34 one.

The outer elevations of the embossing roll 35 frame in this embodiment, the outer elevations of the embossing roll 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 roll 35 , Characterized in that the lateral distance of the elevations of the embossing roll 34 to the embossing roll 35 such that there is less spacing between the flanks of the protuberances than the thickness of the wrapping material strip to be embossed, the wrapping material strip jams between these flanks, preventing retraction of the wrapping material strip at the edge of the wrapping material strip into the inner region of the embossing rolls. This results in a more uniform embossing. In the context of the invention, the embossing roll 35 be considered as the first embossing roll and the embossing roll 34 as a counter roll.

It should be noted that the embossing roller 34 and the embossing roll 35 are spaced so that they do not 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 be. It should also be noted that the radii used have no common divisors to minimize wear of the embossing rolls.

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 area, ie the area remote from the axis of rotation. In this embodiment, the surveys have 44 such as 44 ' and the grooves 43 and 43 ' each semicircular sections. The grooves 43 go over flanks 47 in the surveys 44 over and the elevations 44 ' go into the grooves 43 ' over flanks 47 ' above. The flanks 47 and 47 ' are arranged radially, ie perpendicular to the axes of rotation shown schematically 31 respectively. 32 , The axes of rotation are, for example, also in 2 shown.

It is also a vertical gap 76 in 4 shown, the distance between the two embossing rollers 34 and 35 represents and a horizontal gap 76 ' that the distance of the flanks 47 and 47 ' equivalent. The horizontal gap 76 ' should be less than the thickness of the wrapping material strip to be embossed. The stamping geometry 42 the embossing roll 35 and the embossing geometry 42 ' the embossing roll 34 , which can also be generally referred to as embossing contour, looks like that in an interior area 45 the embossing rollers 34 and 35 comparatively small elevations and grooves are provided in the vertical direction. In addition, each outer areas 46 and 46 ' provided that the formations of the elevations and grooves are more pronounced. The base of the grooves 43 is at a same radius r3. The radius r3 is therefore the same over all areas. The surveys 44 however, have in the outer areas 46 and 46 ' a greater extent than the surveys 44 indoor 45 the roller 35 , So are the outermost four elevations 44 each more pronounced than the next two surveys, which in turn are more pronounced than the elevations of the inner area 45 the embossing roll 35 , The embossing roller behaves correspondingly in a complementary shape 34 whose grooves 43 ' to the surveys 44 the embossing roll 35 are more pronounced. Because the grooves 43 the embossing roll 35 Equally strong are the surveys 44 ' the embossing roll 34 equally pronounced, ie the radius r1 of the elevations of the embossing roll 34 is over the entire embossing roll 34 constant, while the radius r2 of the embossing roll 34 in the 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 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 in 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 forced into the embossing mold or embossing geometry and the fiber structure is 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.

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 on impact, creating a joint area 111 results. Wrapped around this and with the wrapping material strip 33 glued is a wrapping material strip 52 which corresponds 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.

6 schematically shows a side view of a first embossing roll 34 ' and a second embossing roll 35 ' the embossing device 36 ' in a something other embodiment compared with 2 , Again, the wrapping material strip 33 in the effective range of the two embossing rollers 34 and 35 brought. In contrast to the embossing rollers of the 2 the embossing rollers 34 ' and 35 ' of the 6 both intermittent stamping areas 72 ' to 75 ' on. 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.

7 shows in a schematic sectional view in each case a part of the embossing rollers 34 and 35 , which are designed something different than that of the 4 , It can also be the embossing rollers 34 ' and 35 ' here in 7 be shown.

It is here in each case a stamping geometry 42 respectively. 42 ' shown, which may be referred to as wavy, for example. In the inner area 45 the grooves and elevations correspond to those of the 4 , Thus, partial circular elevations and grooves are also provided here. The stamping geometry 42 respectively. 42 ' is different now from the 4 known embossing geometry in that the two outermost grooves and the two outermost elevations are configured differently on average. These are in the outer area 46 to 46 ' with plateaus 48 . 48 ' formed, 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 flank to the other flank in 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 That is, 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 at the grooves smaller compared to those of the inner area.

8th schematically shows a developed wrapping material strip 52 and in comparison, a stamping geometry 42 an equidistant embossing roll. The wrapping material strip 52 is from an equidistant embossing roll 42 been embossed. They are surveys 94 and un-referenced grooves in the wrapping material strip 52 to recognize as a dashed line. These have a different spacing than the elevations and grooves of the embossing geometry 42 the embossing roll. In particular, the centers of the elevations of the embossing geometry are denoted by the reference numeral 81 and corresponding center lines of the elevations of the wrapping material strip with the reference numeral 80 characterized. These are approximately in the middle of the embossing geometry 42 consistent and as a reference 91 characterized. The distances between the respective center lines change to the left and right 80 and 81 , This is due to a distortion in the further processing process. The wrapping material strip 52 , which is stamped here, is one which is wrapped around a filter material in a finished filter and correspondingly in 8th is shown completed. It is thus a wrapping material strip of a manufactured filter, in which the distances between the center lines 80 through the manufacturing process of the filter compared to the surveys 81 the stamping geometry 42 distort.

In order to counteract this or to obtain a uniform embossed structure, an altered embossing geometry is now provided according to the invention. 9 shows only as an example a possible embossing geometry. There is an embossing roll there 34 shown the appropriate surveys 44 and grooves. The distances of the surveys 44 preferably from the centers 81 the elevations to the centers 81 are measured by adjacent surveys are different. In particular, corresponding distances 84 and 85 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, for example 82 and 83 characterized. These too can be different from each other. In the case of the produced wrapping material strip or groove structure of the wrapping material strip 52 out 8th However, the embossing geometry should be different than the in 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.

To calculate the deviations of the position or the distances of the elevations or grooves of the equidistant embossed structure 42 the reference 8th to allow now, the distances or the deviations of the distances of the actually produced wrapping material strip 52 out 8th measured. It will then be for the appropriate surveys 1 . 2 . 3 etc. in the example of 10 until the survey 8th the corresponding deviations through a measurement curve 87 applied and fitted by a second degree polynomial. 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. An appropriate fit 88 is in this Example in the 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 R = -0.0113 X ² + 0.0678 X results in a good fit 88 to those in there 10 shown measured values 87 , The deviations calculated as a result 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 10 It can be seen that initially the right and left of a central elevation of the embossing roller, the distance of the surveys 1 to 4 increases by about 0.1 of the equidistant distance. The assessment 6 has approximately the previously chosen distance, so the equidistant distance. The surveys 7 and 8th are arranged closer together.

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

1-10

 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

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 102012201279 A1 [0002, 0005]
• CN 258802 Y [0004]
• EP 2591686 A1 [0032]

Claims (18)

Embossing roll ( 34 . 35 ) for an embossing device ( 36 . 36 ' ) a device ( 30 ) for processing a wrapping material strip ( 33 . 52 ) for a rod-shaped article of the tobacco processing industry, wherein by means of the embossing device ( 36 . 36 ' ) of wrapping material strips ( 33 . 52 ) during a longitudinal axial conveying of the wrapping material strip ( 33 . 52 ) is embossed or embossed, the embossing roll ( 34 . 35 ) an at least partially circumferential embossing geometry ( 42 . 42 ' ), wherein the embossing geometry ( 42 . 42 ' ) of the embossing roll ( 34 . 35 ) alternately grooves ( 43 . 43 ' ) and surveys ( 44 . 44 ' ), which in the circumferential direction of the embossing roll ( 34 . 35 ), characterized in that a first distance ( 82 ) of 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 surveys ( 44 . 44 ' ) different from a fourth distance ( 85 ) of at least two other adjacent surveys ( 44 . 44 ' ). Embossing roll ( 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 having a variable having a consecutive number ( 1 - 10 ) of a number of juxtaposed grooves ( 43 . 43 ' ) and / or surveys ( 44 . 44 ' ) corresponds. Embossing roll ( 34 . 35 ) according to claim 1 or 2, characterized in that at least one groove ( 43 . 43 ' ) and / or survey ( 44 . 44 ' ) in an outer area ( 46 . 46 ' ) of the stamping geometry ( 42 . 42 ' ) is more pronounced than a groove ( 43 . 43 ' ) and / or survey ( 44 . 44 ' ) in an inner area ( 45 ) of the stamping geometry ( 42 . 42 ' ). Embossing roll ( 34 . 35 ) according to claim 3, characterized in that on both sides of the embossing geometry ( 42 . 42 ' ) the outermost groove ( 43 . 43 ' ) and / or extreme survey ( 44 . 44 ' ) are more pronounced. Embossing roll ( 34 . 35 ) according to claim 3 or 4, characterized in that a plurality of grooves ( 43 . 43 ' ) and / or surveys ( 44 . 44 ' ) in the outer area ( 46 . 46 ' ) of the stamping geometry ( 42 . 42 ' ) are more pronounced. Embossing roll ( 34 . 35 ) according to claim 5, characterized in that at least two grooves ( 43 . 43 ' ) and / or surveys ( 44 . 44 ' ), in the outer area ( 46 . 46 ' ) are arranged side by side, are equally pronounced. Embossing roll ( 34 . 35 ) according to claim 5, characterized in that a first enveloping curve for the grooves ( 43 . 43 ' ) and / or a second enveloping curve for the surveys ( 44 . 44 ' ) is provided, which is at least partially parabolic. Embossing roll ( 34 . 35 ) according to one of claims 1 to 7, characterized in that the grooves ( 43 . 43 ' ) and / or the surveys ( 44 . 44 ' ) are at least partially circular in section. Embossing roll ( 34 . 35 ) according to one of claims 1 to 8, characterized in that the flanks ( 47 . 47 ' ) between the grooves ( 43 . 43 ' ) and each to the grooves ( 43 . 43 ' ) adjacent surveys ( 44 . 44 ' ) are arranged radially. Embossing roll ( 34 . 35 ) according to one of claims 3 to 8, characterized in that the groove ( 43 . 43 ' ) and / or survey ( 44 . 44 ' ) in the outer region of the embossing geometry ( 42 . 42 ' ) between their flanks ( 47 . 47 ' ) with a plateau ( 48 . 48 ' ) are formed, is between the plateau ( 48 . 48 ' ) and the flanks ( 47 . 47 ' ) a rounded edge ( 49 . 49 ' ) is provided. Embossing device ( 36 ) with a first embossing roll ( 35 ) according to one of claims 1 to 10, wherein a counter-roller ( 34 ) which is complementary in shape to the first embossing roll ( 35 ), wherein a gap ( 76 ' ) of flanks ( 47 . 47 ' ) between the grooves ( 43 . 43 ' ) and surveys ( 44 . 44 ' ) which is smaller than a thickness of the wrapping material strip ( 33 ). Embossing device ( 36 . 36 ' ) according to claim 11, characterized in that the horizontal gap ( 76 ' ) between one side of a survey ( 44 ) of the first embossing roll ( 35 ) and a groove ( 43 ' ) of the counter roll ( 34 ) is different than on the other side of the survey ( 44 ) of the first embossing roll ( 35 ) and the groove ( 43 ' ) of the counter roll ( 34 ). Embossing device ( 36 . 36 ' ) according to claim 11 or 12, characterized in that in a first outer region ( 46 ) a horizontal gap ( 76 ' ) between one side of a survey ( 44 ) of the first embossing roll ( 35 ) and a groove ( 43 ' ) to the counter roll ( 34 ) a horizontal gap ( 76 ' ) between an opposite side of a survey ( 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 11 to 13, characterized in that the distance ( 76 ) of the embossing rollers ( 34 . 35 ' ) is adjustable. Contraption ( 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 one of claims 11 to 14, by means of which the wrapping material strip ( 33 . 52 ) during a longitudinal axial conveying 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 10, of an embossing device ( 36 . 36 ' ) an apparatus for processing a wrapping material strip ( 33 . 52 ) for a rod-shaped article of the tobacco processing industry comprising the following steps: embossing of the wrapping material strip ( 33 . 52 ) with a first coining roller ( 34 . 35 ), Processing the embossed wrapping material strip ( 33 . 52 ) to a rod-shaped article of the tobacco processing industry, comparing an embossing pattern of the wrapping material strip ( 33 . 52 ) after producing the rod-shaped article with a stamping geometry ( 42 . 42 ' ) of the first embossing roll ( 34 . 35 ), based on deviations of the embossing pattern of the wrapping material strip ( 33 . 52 ) to the stamping geometry ( 42 . 42 ' ) of the first embossing roll ( 34 . 35 ) an embossing geometry ( 42 . 42 ' ) a second embossing roll ( 34 . 35 ) is adjusted. A method according to claim 16, characterized in that larger distances between elevations ( 94 ) in the embossing pattern compared to the intervals between surveys ( 44 . 44 ' ) of the stamping geometry ( 42 . 42 ' ) of the first embossing roll ( 34 . 35 ) to smaller distances between the surveys ( 44 . 44 ' ) of the stamping geometry ( 42 . 42 ' ) of the second embossing roll ( 34 . 35 ) to lead. Method according to claim 16 or 17, characterized in that the deviations cause a fit ( 88 ), wherein in particular the fit ( 88 ) is a second degree polynomial dependent on a variable, the variable being a sequential number ( 1 - 10 ) of a number of juxtaposed grooves ( 43 . 43 ' ) and / or surveys ( 44 . 44 ' ), or where the variable is a distance of grooves ( 43 . 43 ' ) and / or surveys ( 44 . 44 ' ) to a reference groove and / or a reference survey ( 91 ).

Images