EP1929075B1 - Device for processing fibres at the drum of a card - Google Patents

Description

The present invention relates to apparatus for processing fibers on the drum of a card, in particular for the removal of impurities on the drum of a revolving flat card. The term "contaminant" in this application encompasses all materials that have a significantly higher specific gravity compared to dissolved (opened) cotton fibers so that they behave differently from cotton fibers under the effect of centrifugal force, for example, trash particles, leaf debris, seed husks, stem remnants , Sand and not opened nits.

State of the art

In the blowroom and carding the cotton is prepared for further processing into a yarn. The cotton flakes are taken from bales, cleaned and pre-dissolved. The card as the final cleaning step is the heart. Here, the cotton is not only cleaned, but dissolved in individual fibers and combined into a single volume. Since the process steps after the carding machine no longer contain any cleaning steps, the quality of the tape is of great importance for the quality of the yarn spun therefrom. Especially dirt particles and nits, which should have been eliminated at the latest on the card, can be recognized directly in the yarn as impurities or thick areas.

The card has a rotatable drum fitted with a garnish which can be divided into three carding zones: the main carding zone, the pre-carding zone and the post-carding zone. Although the main carding zone may consist of hard covers, a traveling deck system is the preferred system at least for processing cotton fibers. Depending on the make of the card, the revolving system consists of 79 to 112 covers, which are combined by a chain or a belt to form a revolving endless belt. There are 20 to 50 lids constantly in working position. In working position, the lids are then when they are arranged with their clothing side opposite the drum set. For more than forty years now it has been state of the art in the design of cotton carding devices to provide for the elimination of impurities in the pre- and Nachkardierzone.

DE-C-3336323 proposes a device for eliminating impurities such as trash, shell parts u. Like. Before, wherein the device above the pickup, that is arranged in the Nachkardierzone. The device has a knife blade which is formed integrally with a suction chamber.

DE-A-3821771 shows a method for separating waste, wherein the drum of the cotton carda sucks through its rotation at the separator air from the environment through an air gap formed by the drum, which air flows directly into a waste collector.

EP-B-338 802 shows a complex arrangement of covers upstream of a separation gap, leaving an air supply gap between selected covers.

EP-B-848 091 the applicant itself shows a fiber-processing machine with a Ausscheidkante, wherein at least one measure is taken to limit a caused by the air discharge pressure drop downstream of the edge or compensate. The measure is preferably to air in the. To let space flow downstream from the edge.

DE-A-10207159 provides in the pre-and / or Nachkardierzone before a plurality of working elements such as Festkardierelemente, suction, Ausscheidemesser ago, wherein at least two working elements, a module is formed. The invention is characterized in that in the pre- and / or Nachkardierzone each have at least two modules are provided for the excretion of foreign bodies (contaminants) such as trash and / or for the excretion of Nissen. In the embodiment according to the FIG. 2 two modules are provided in the Vorkardierzone, each comprising a Festkardierelement, a suction hood and a pressure element. These modules are designed to improve the excretion of Foreign bodies such as trash, seed pieces, leaf debris and the like. Like. Allow. In a module for the excretion of Nissen apparently the order of the working elements to be changed, namely on the order pressure element, suction hood, Festkardierelement. Such modules are in the embodiment according to the FIG. 3 shown in the post carding zone. According to the doctrine of DE-A-10207159 Therefore, the flow conditions of the air / fiber flow in the so-called carding are influenced by means of backflow or release of the current. Although the air flows in the carding nip can be considerably disturbed by a plurality of immediately succeeding separation systems, influencing the sensitive flow conditions which are important for the carding effect, as disclosed in this document, can have a negative effect on the result of the entire carding zone rather than the sum of the individual Have partial zones.

The object of the invention is to improve the effect of the entire carding zone as the sum of the individual partial zones, and thus to improve the effect of the pre-carding zone and the post-carding zone.

The invention provides a device for processing fibers on the drum of a revolving flat card with a main carding zone, a pre-carding zone and a post-carding zone. In the Nachkardierzone several separation modules are provided for the elimination of impurities. A carding element is provided in the post-carding zone such that the fibers are processed by this element after passing the separation modules and before they reach the pick-up. The condition, especially the orientation, of the removed fibers is essentially determined by the processing of the last-mentioned carding element. In the preferred embodiment, an air supply is provided after the first excretion module and before the last excretion module.

Figur 1

Schematische Seitenansicht einer Karde.

Figur 2

Schematische Seitenansicht der Nachkardierzone einer Karde mit einer Vorrichtung gemäss der vorliegenden Erfindung.

Figur 3

Darstellung im Querschnitt eines Ausscheidemoduls zur Verwendung in einer Vorrichtung gemäss der Figur 2.

Figur 4

Prinzipskizze zur Darlegung der Strömungsverhältnisse im Kardierspalt zwischen einem Kardierelement und der Trommelgarnitur in der Figur 3.

Figur 5

Detail einer Befestigung für ein Kardierelement zur Verwendung in einem Modul gemäss der Figur 3.

Figur 6

Prinzipskizze zur Darlegung der Strömungsverhältnisse im Kardierspalt zwischen dem Leitelement und der Trommelgarnitur in der Figur 3.

With reference to the figures and examples further features of the invention will be explained.

FIG. 1

Schematic side view of a card.

FIG. 2

Schematic side view of Nachkardierzone a card with a device according to the present invention.

FIG. 3

Representation in cross section of a separation module for use in a device according to the FIG. 2 ,

FIG. 4

Schematic diagram to illustrate the flow conditions in the carding gap between a carding and the drum set in the FIG. 3 ,

FIG. 5

Detail of a fastening for a carding element for use in a module according to the FIG. 3 ,

FIG. 6

Schematic diagram to illustrate the flow conditions in the carding gap between the guide element and the drum set in the FIG. 3 ,

FIG. 1 shows a revolving flat card, for example the Rieter card C60 with a working width of 1.5 m. Fiber flakes are transported through transport channels through the various Putzereiprozessstufen (not shown) and finally fed to the hopper 16 of the card. The shaft 16 in FIG. 1 is designed as a so-called "cleaner shaft" with a cleaning module between the shaft top and the manhole base. However, this is not essential for the present invention, instead of a cleaner shaft and a normal hopper can be provided. The shaft then passes the fiber flakes to the card as cotton wool, namely to a known feed device, which feeds the cotton into the card at a predetermined speed.

The feeder feeds the fiber flakes to a licker-in module 3, which in the illustrated embodiment has three lickerins. The lickerins open the fiber flakes and remove some of the dirt particles. The last licker-in roller passes the carding drum 1. The carding drum cooperates with the covers 7 of a revolving flat-top aggregate 2, thereby further parallelizing the fibers. The covers are cleaned by a cover cleaning 14 and possibly ground with a grinding device. After the fibers have partially carried out several cycles on the card drum, they are removed by the pickup 4 of the card drum, fed to the discharge area (5) and finally deposited as a card sliver in a can in a pot (not shown).

The traveling lid unit 2 has, together with the drum 1, the function, the dissolution of the flakes into individual fibers, removal of impurities and dust, elimination of very short fibers, the dissolution of nits and the parallelization of the fibers. The region 8 of the main carding zone can be defined with an angle α. This area extends from the point where the first lid is placed in working position to the point where the last lid leaves the working position. Viewed in the direction of rotation of the drum, the pre-carding zone is located before the main carding zone and the post-carding zone is after the main carding zone.

The cover 7 are moved with an endless belt or a chain over pulleys 6 with a drive on the drum surface, mostly against the direction of rotation of the drum. The underside of the lid is provided with a set, for example with a sawtooth or flexible sets in the form of check mark, with alternative forms of trimmings come into question. The drum also has a set that works with the lid. Between the drum and the flat set is a gap called the carding nip. The lids run over two flexible bows, which are arranged on each side of the drum. The flexible sheet can be provided with means (not shown) for adjusting the sheets, so that an accurate adjustment of the carding gap can be made. This carding nip is normally selected over almost the entire main carding zone so that the lids are set at a constant distance from the drum. However, the gap can also open - the carding gap is greater - or closing - the carding gap is smaller - to be set. The size of the carding nip is, for example, between 0.10 to 0.30 mm for cotton or to 0.40 mm for chemical fibers in the case of a revolving flat card.

The carding drum has a diameter D and a working width A (not shown in FIG FIG. 1 ), wherein the working width A is given by the axial length of the garnished surface of the drum. In the latest generation of high-performance carding machines, for example the C60 carding machine from Rieter, the working width of the drum has been increased from the usual value in the range of 1 m to 1.5 m. In addition, the diameter of the drum is reduced from the usual 1.3 m to about 0.814 m. A card with a reduced drum diameter is preferably driven at a speed such that the peripheral speed of the drum set is equal to the peripheral speed of the drum set of a conventional card. The resulting centrifugal force at the circumference of the drum of a "small" card, however, is significantly higher. Due to the changed geometry and the corresponding changed processing parameters, the card can process more than 200 kg / h of cotton today.

• eine Leitplatte bzw. Verdeckelement 20, welche(s) in den Zwickel hineinragt, wo sich die Deckel 7 des Wanderdeckelaggregates 2 der Trommel 1: annähern oder bei umgekehrter Laufrichtung der Deckel, sich von der Trommel wegbewegen würden;
• eine Absaughaube 22 eventuell mit einem Messer 23 bestückt, welche sich unmittelbar an der Leitplatte 22 anschliesst;
• ein Ausscheidemodul 24;
• ein Kardiersegment 26, und
• eine Absaugeinheit 28, welche dem Zwickelbereich zwischen der Trommel 1 und dem Abnehmer 4 zugeordnet ist und ausserdem eine Leitfläche an der Trommel bildet.

Obwohl sie in der Figur 1 nicht gezeigt sind, ist es dem Fachmann bekannt, dass zwischen der Haube 22 und dem Modul 24, dem Modul 24 und dem Segment 26 sowie zwischen dem Segment 26 und der Einheit 28 Dichtungen vorgesehen sind. Der "Lufthaushalt" im Kardierspalt und die Umgebung der Trommel werden somit weitgehend von gegenseitig störenden Einflüssen abgeschirmt.In the card according to the FIG. 1 are, viewed in the direction of rotation of the drum, the following working elements in the Nachkardierzone between the moving lid unit 2 and the pickup 4:

• a guide plate or cover element 20, which (s) protrudes into the gusset, where the cover 7 of the traveling lid unit 2 of the drum 1: approach or in the reverse direction of the lid would move away from the drum;
• a suction hood 22 may be equipped with a knife 23, which adjoins directly to the guide plate 22;
• a separation module 24;
• a carding segment 26, and
• a suction unit 28, which is associated with the gusset area between the drum 1 and the pickup 4 and also forms a guide surface on the drum.

Although she is in the FIG. 1 are not shown, it is known in the art that between the hood 22 and the module 24, the module 24 and the segment 26 and between the segment 26 and the unit 28 seals are provided. The "air balance" in the carding nip and the environment of the drum are thus largely shielded from each other interfering influences.

The FIG. 2 now shows a schematic opposite to the FIG. 1 modified arrangement according to the present invention. But since the guide plate 20 and the suction hood 22, also functional, compared to the FIG. 1 have remained unchanged, they are indicated in both figures with the same reference numerals. This element is mainly used to catch the dirt particles that have been released by the revolving lids. By the use of the blade 23 dirt particles from the environment of the drum 1 can be additionally dissipated, this function of the suction hood is of no great importance and the suction hood 22 is therefore not counted among the separation modules.

• eine Absaughaube 22
• ein erstes Ausscheidemodul 30;
• ein zweites Ausscheidemodul 32;
• ein Kardiersegment 34, und
• ein Leitelement 36, welches in den vorerwähnten Zwickel zwischen Trommel 1 und Abnehmer 4 hineinragt.

The arrangement according to the FIG. 2 includes viewed in the direction of rotation of the drum:

• a suction hood 22
• a first separation module 30;
• a second separation module 32;
• a carding segment 34, and
• a guide element 36 which projects into the aforementioned gusset between the drum 1 and the pickup 4.

The separation modules 30 and 32, the carding segment 34 and the guide element 36 each form a structural unit, which are fastened at their ends to a respective arch 40 (only a sheet 40 in the FIG. 2 visible). The bows 40 are fastened in the carding frame (not shown) by means of bolts (not shown) which cooperate with receptacles 42 on the respective bows. Since the general structure of module 30 is substantially the same as the general structure of module 32, only module 30 will be described below. The description also applies to the module 32.

• ein erstes Teilprofil 54 und ein zweites Teilprofil 56, die zusammen ein Schmutzabfuhrrohr mit einem kanalförmigen Hohlraum 58 bilden;
• ein elastisches Befestigungselement 60, welches dazu dient die Teilprofile 54, 56 zusammenzuhalten und dadurch den Hohlraum 58 zu bilden;
• ein Ausscheidespalt 62, welcher den Kardierspalt K für Luftströmungen mit dem Hohlraum 58 verbindet;
• eine Messerklinge 64, die in einer dafür gebildeten Aufnahme in einer Fusspartie 66 des Teilprofils 54 befestigt ist;
• eine Leitfläche 68, welche der Trommelgarnitur gegenübersteht, und
• ein Element 70 mit einer strukturierten Fläche 71, wobei das Element 70 derart an einer Fusspartie 72 des Wandelements 56 angebracht ist, dass die Fläche 71 der Trommelgarnitur gegenübersteht.

The separation module 30, 32 is in the FIG. 3 shown in cross-section, wherein the lateral surface of the drum set is indicated by the reference numeral 1A. The module 30 comprises

• a first sub-profile 54 and a second sub-profile 56, which together form a dirt removal tube with a channel-shaped cavity 58;
• an elastic fastener 60 which serves to hold the sub-profiles 54, 56 together and thereby form the cavity 58;
• a separation gap 62 connecting the carding gap K for airflows to the cavity 58;
• a knife blade 64 secured in a receptacle formed therefor in a foot portion 66 of the sub-profile 54;
• a guide surface 68, which faces the drum set, and
• a member 70 having a textured surface 71, the member 70 being attached to a foot portion 72 of the wall member 56 such that the surface 71 faces the drum assembly.

It should be noted that the element 70 is immediately adjacent to the separating slit 62. The wall elements 54, 56 are independent of each other, via their respective foot sections 66, 72 on the arc 40 (FIG. Fig. 2 ), in each case such that the distance between the foot section and the drum set can be set selectable. Many fastening methods are known to those skilled in the art, which allow the required adjustability. No specific variant is shown or described here, since the selection in and of itself makes no contribution to the invention. It should be noted, however, that the elastic connection 60 is the mutual one Adjustment of the two wall parts 54, 56 must allow for ensuring a tight connection between these parts at their mutual points of contact.

For the sake of simplicity, it is assumed for the time being that the element 70 is a carding strip. The structuring of the surface 71 is thus given by the teeth of the carding strip 70. The function of this element in the separation module can be explained relatively easily on the basis of the known structure of a carding strip. Subsequently, alternative structures for the surface 71 will be discussed.

The FIG. 4 shows schematically (in principle) the flow conditions in the carding nip K between the carding strip 70 and the drum set with lateral surface 1A. The FIG. 4 also shows examples of setting parameters that can be used for a carding machine with a drum diameter of 814 mm, especially when choosing a conventional carding strip with a width B of the clothing strip of 30 mm. The operating direction of rotation of the drum is indicated by a curved arrow. The carding position of the clothing teeth of the carding strip is indicated schematically in that the tip of each tooth is directed against the drum rotation direction.

Assuming now that the Gamitur tip of the strip form a lateral surface lying in a plane 74, and the central longitudinal axis of this lateral surface in a circle 75, which is concentric with the drum 1, one can, for example, a gap width of 0.35 mm in between adjust this longitudinal axis and the lateral surface of the drum set. This results in the edge regions of the strip a larger gap width, as from FIG. 4 can be seen. In the main carding zone 8, the flakes have been largely dissolved, with the covers 7 being unable to pick up any trash particles and impurities and remove them from the card. By dissolving the flakes impurities ("particles") were released. Since the specific gravity of these particles is higher than the specific gravity of the fibers, both materials (impurities and Fibers) are subjected to a high centrifugal force, the released particles tend to move radially outward in the carding nip. The lanes between the clothing tips of the carding strip 70 allow this radial displacement of the particles, while the fibers of the flakes tend to catch on the clothing surfaces, so that they are prevented from free radial displacement. Many particles therefore pass directly from the lanes of the clothing strip into the separation gap 62.

It follows that the structuring of the surface 71 should be chosen such that it tends to allow the particles to "bleed" (with relatively high specific gravity) and make it difficult to fiber out. It can only be spoken of tendencies, because the exact selectivity is not possible. Some of the fairies will still be associated with the good fibers to remain in the drum set while some fibers will penetrate the set of the strip 70 with the particles, with the shorter (less valuable) fibers being able to with the particles to fly outside. It will therefore be clear that a strip of teeth could be used "inverted" with respect to the carding position and nevertheless function similarly in terms of precipitation selectivity. Under these circumstances, however, the strip would not contribute to the degree of resolution or parallelization of the processed fibers. If no further resolution (eg of neps) or parallelization is necessary in the module 30, a non-carding, structured area 71 can be used. Suggestions for such areas are in EP-A-388 791 listed.

The FIG. 5 The carding element 70 comprises a support rod 80 with a dovetail-shaped receptacle for fittings 82. The rod 80, viewed in its longitudinal direction, extends over the entire working width of the drum and is over its entire length provided with spacers 84, 86, wherein the two middle spacers 86 are hook-shaped and together form a receptacle for a mounting rail 88. The rail 88 has distributed over its length openings 90, each with are threaded. After insertion of the rod 88 into the receptacle, the apertures 90 face the apertures 92 provided in the foot portion 72. Through each opening 92, a respective bolt 94 can be guided to cooperate with the thread of the corresponding opening 90. As a result, the rail 88 is pressed firmly against the hook-shaped spacers 86 and these are firmly clamped between the rail 88 and the foot section 72. Access to the bolts 94 can be ensured via holes 96 in the wall part 56, these holes preferably being closed by means of a suitable cover 98 during operation. As an alternative solution for the attachment threaded pins can be used, which are glued into the threaded hole 90 of the rail and ground down flush. Since this part can be guided from below through the openings 92, only one nut has to be guided through the opening 96 and fastened to the grub screws for the connection.

The conditions in the carding nip in the vicinity of the knife blade 64 are shown schematically in FIG FIG. 6 shown. The lateral surface of the drum set is again denoted by reference numeral 1A. It is assumed that the blade 64 is attached to the foot part 66, so that the distance y between the knife edge and the lateral surface 1A is predetermined, for example in the range 0.2 to 0.6 mm, preferably about 0.3 to 0.5 mm. The distance between the adjacent edge region of the strip 70 and the lateral surface 1A is denoted by z and is, for the reasons mentioned above, usually slightly larger than the distance y, for example in the range 0.5 to 1 mm.

The guide surface 76 forms a curved surface which is arranged approximately concentrically with the drum 1. This baffle has, in particular, an effect on the air flow in the carding nip, after a part of the air quantity has been peeled off from the separating gap 62 on the blade 64 upstream and in the cavity 58 (FIG. Fig. 3 ) was discharged. In order not to impair the setting of the important distance y, an increased distance between the guide surface 76 and the lateral surface is preferred 1A provided. On the other hand, to prevent the formation of a "dead space" or a vortex downstream of the blade 64 as possible, the distance between the guide surface 76 and lateral surface 1A should not be much larger than the distance y. The attachment of the guide element on the foot part 66 thus preferably results in a small enlargement x of the carding gap downstream of the blade 64, for example in the range 0.15 to 0.25 mm.

• durch eine Einstellung von y und z und/oder
• durch die Auswahl der Spitzendichte des Kardierstreifens 70 und/oder
• durch die Breite C des Ausscheidespaltes 62.

The excretion amount can be influenced in at least 3 ways:

• by setting y and z and / or
• by selecting the peak density of the carding strip 70 and / or
• by the width C of the separating slit 62.

The good fibers passing the knife blades of modules 30 and 32 have therefore twice been subjected to the turbulent flows near these blades. The baffles 68 of the modules are not designed to process the fibers to restore order to the batt on the drum surface, but rather to re-control the restless air currents. Even if in module 32 ( Fig. 2 ) the structured area 71 (FIG. Fig. 3 ) is formed by a carding strip, it must be expected that the fibers lose their order again during the excretion partially. Any loss of fiber order in the nonwoven to be processed results in an increase in the number of nits in the final product, especially when processing longer, finer (ie, more valuable) fibers. To counter this effect, the carding segment 34, viewed in the fiber flow or drum rotation direction, is located behind the (downstream of) the last separation module (in FIG Fig. 2 , after the module 32) is provided. The segment 34 is provided in the illustrated embodiment with a single carding element. This element preferably has a peak density greater than 300 ppsi (points per square inch), for example a peak density of 660 ppsi. If sufficient space is available, several carding elements can be used in the segment 34. Experiments have shown, however, that the required rearrangement of the fibers prior to entry into the take-off zone can be effected by a single carding element.

The guide member 36 contributes nothing to the processing of the fibers, but is designed to initiate the fiber / air flow clean in the gusset between the drum 1 and the pickup 4, if possible without disturbing the previously achieved order of fibers.

The effect of the two separation modules 30 and 32 must now be assessed not in the total amount of precipitated material, but in the composition of a given discharge quantity, the higher the proportion of impurities in the outlet the more successful (selective) has worked the separation system. The amount of waste discharged in a module can be increased by increasing the width of the gap between the working element preceding the separating slit and the drum set. The selectivity is increased by reducing this width. By using two modules, it is possible to divide a desired output quantity between the two modules, but to reduce the gap widths (settings) of the working elements and thereby increase the selectivity. It follows, however, that the first module 30 removes a relatively large amount of air from the carding nip. It is then under certain circumstances for the second module 32 too little air available to ensure the optimal operation under the otherwise given conditions.

In order to prevent this unwanted interaction, in the preferred embodiment the casing seal between modules 30 and 32 is removed so that the space between these modules as the air supply channel 80 (FIG. Fig. 2 ): The air introduced via the duct is preferably evenly distributed over the working width. The amount of air that is introduced into the carding nip via this channel depends on the prevailing pressure conditions in the carding nip and is therefore largely "self-adjusting". As more air is peeled off by the blade in the module 30, the pressure in the subsequent section of the carding nip drops and it introduces more "false" air through the channel 80 into the carding nip. However, much of this newly introduced air is immediately peeled off again in module 32, helping to maintain stable flow conditions in this module. It will be clear to those skilled in the art that the weakening of the gasket is not an essential measure - the same technological effect could be achieved at the expense of additional technical expense by providing an active air supply while retaining the complete casing of the drum. However, the active air supply would be controllable and would thus represent an additional adjustment.

The benefits of the invention are not necessarily to be seen in maximizing the amount of waste but in improving (maximizing) the selectivity. This makes it possible to optimally utilize the limited space in the Nachkardierzone, especially when using a drum with a reduced diameter. However, it is important to realize that even with the use of a conventional drum of larger diameter, the precipitation of impurities at the expense of the fiber order is performed, and therefore measures must be taken to restore the required fiber order before the forwarded from the drum fleece for Customer arrives.

Claims (11)

1. A device for processing fibres on the cylinder (1) of a revolving flat card comprising a main carding zone, a pre-carding zone and a post-carding zone, wherein a plurality of separation modules (31, 32) for separating impurities are provided in the post-carding zone, wherein at least one carding element (34) is provided in the post-carding zone in such a manner that the fibres are processed by this element after they have passed the separation modules (30, 32) and before they reach the doffer (4) so that the alignment of the doffed fibres is substantially determined by the processing by the said carding element (34), characterised in that after the carding element (34) when viewed in the fibre flow direction, an element (36) comprising a guide surface for the fibre/air flow on the cylinder (1) projects in the lap between the cylinder (1) and the doffer (4).
2. The device according to claim 1, characterised in that an air supply (80) is provided after the first (30) and before the last separation module (32) in the post-carding zone.
3. The device according to claim 2, characterised in that the air supply (80) is achieved by forming a false air gap in the cylinder sheathing.
4. The device according to claim 3, characterised in that for forming the air supply (80), a gap in the cylinder sheathing is left at least partially open.
5. The device according to any one of claims 2 to 4, characterised in that two identically configured modules (30, 32) are provided in the post-carding zone, wherein the air supply (80) is provided between these two modules.
6. The device according to any one of the preceding claims, characterised in that at least one separation module (30, 32) comprises a profile affixed to the card frame, which forms a discharge tube (58) which is connected to the carding gap (K) via a separating gap (62), wherein the profile (54) is provided with a knife blade (64) after the separating gap (62), a working element (70) having a structured surface (71) before the separating gap (62) and a guide surface (68) after the knife blade (64).
7. The device according to claim 6, characterised in that the narrowest distance (z) between the structured surface (74) and the circumferential surface of the cylinder clothing (1A) is in the range of 0.2 to 0.5 mm.
8. The device according to claim 6 or 7, characterised in that the greatest distance (z) between the structured surface (74) and the circumferential surface of the cylinder clothing (1A) is in the range of 0.5 to 1 mm.
9. The device according to any one of claims 6 to 8, characterised in that the distance (y) between the knife edge and the circumferential surface of the cylinder clothing (1A) is in the range of 0.2 to 0.6 mm, preferably between 0.3 and 0.5 mm.
10. The device according to any one of claims 6 to 9, characterised in that the distance (x + y) between the guiding surface (68) of the module and the circumferential surface of the cylinder clothing (1A) is only slightly greater than the distance (y) between the blade edge and the circumferential surface of the cylinder clothing (1A).
11. The device according to any one of the preceding claims, characterised in that the cylinder diameter is between 750 and 900 mm, in particular between 800 and 850 mm.

Images