Carding machine

Abstract

The invention relates to a carding machine with an admission side for fibre tufts, wherein the carding machine is designed to feed the fibre tufts to a rotating drum (4) by means of at least one taker-in (3a, 3b, 3c), wherein the fibre tufts are broken down to the individual fibre, oriented and cleaned between fixed carding elements and circulating carding bars (17) and the drum (4), and the resulting fibrous web can be transferred from the drum (4) onto a doffer (5), downstream from which there is arranged a device for converting the fibrous web to a sliver. The invention is characterized in that the diameter of the drum (4) is at least 1,300 mm and the difference in distance between the front and rear heel (Fv-Fh) of a flat 20 mm wide clothing (17a) of a carding bar (17) and the clothing of the drum (4) is less than 12 / 1000 inch.

Description

[0001] Title: Teasel

[0002] Description

[0003] The present invention relates to a carding machine with an inlet side for fiber tufts, wherein the carding machine is designed to feed the fiber tufts to a rotating drum by means of at least one licker-in. On the drum, the fiber tufts are opened down to the individual fibers between fixed carding elements and rotating flat bars, aligned, and cleaned. The resulting fiber web is transferred from the drum to a doffer, which is followed by a device for converting the fiber web into a fiber sliver.

[0004] State-of-the-art revolving flat cards are known, which essentially consist of a large main cylinder, the drum or tambour, on which fibers are carded by a specific number of revolving flats and fixed carding elements. The material-feeding working element is the licker-in, and the material-removing working element is the doffer. The carding length and, in particular, the number of rotating flat bars of the revolving flat engaged have a significant influence on carding quality. The carding area and the speed of the drum, in turn, are crucial for carding machine productivity. Increasing the drum speed is possible, although this results in very high centrifugal forces that lead to convex deformation of the drum. This increases the carding gap towards the drum edges if a constant carding gap is assumed for the drum center.A further disadvantage of increased drum speed is the associated heating and thermal expansion of the drum, as the speed of the fibers between the drum and the carding elements increases, leading to increased friction. For revolving flat cards, a drum diameter of less than D=1300mm is generally used. To increase the carding length around this drum, the common method is to move the licker-in and / or doffer further under the drum. This increases the usable circumferential length to accommodate the desired number of additional revolving flats.

[0005] This method is limited when these rollers are offset so far that their attachments almost touch each other. This method inevitably leads to two mutually interacting disadvantages:

[0006] The drum must be positioned very high in the machine, at least high enough to be above the pickup. This pickup typically has a fairly large diameter, around 700mm, so the large drum must be positioned very high. The higher the heavy, high-speed drum is positioned at approximately 600 rpm, the worse the running stability and vibration stiffness become. The supporting frame structure must be correspondingly large and strong and must not be too slim.

[0007] Accessibility for frequent (sometimes daily) cleaning and maintenance is severely limited. Depending on the design, this may even require a complex, rail-guided movement of the licker-in unit.

[0008] Both disadvantages increase manufacturing costs and make maintenance more difficult.

[0009] EP 3162927 A1 discloses a carding machine with a carding length of more than 3000 mm, with a drum diameter between 1150 mm and 1250 mm. The increased carding length is achieved by relocating the licker-in and doffer beneath the drum. The drum speed is specified to be between 500 and 600 revolutions per minute. This allows for an increase in the number of fixed carding elements and flat bars used in the carding process. The disadvantage is the increased overall height.

[0010] EP 2527505 discloses a revolving flat carding machine that proposes a specific geometric arrangement of the licker-in and doffer to achieve high productivity. The entire geometry is aligned with a horizontal carding orientation. A disadvantage of this device is that the arrangement of the licker-in and doffer results in a large overall height for the carding machine, thus unutilizing a possible transport path on the drum. The drum diameter is up to 1200 mm.

[0011] Document IN351271 B also describes a "high-set" carding machine with a drum diameter of up to 1100 mm and in which at least 36 rotating flat bars are always engaged. This document clearly highlights the relationships between drum size, thermal expansion, and centrifugal forces at constant speed, so that from a drum diameter of 1287 mm, more disadvantages than advantages arise.

[0012] Accordingly, the invention is based on the object of developing a carding machine in such a way that the carding length is increased without the aforementioned disadvantages occurring.

[0013] The invention solves the stated problem by a system having the features specified in claim 1. Advantageous developments of the invention are defined in the dependent claims. The invention relates to a carding machine with an inlet side for fiber tufts, wherein the carding machine is designed to feed the fiber tufts to a rotating drum by means of at least one licker-in. On the drum, the fiber tufts are opened up to the individual fibers between fixed carding elements and rotating flat bars, aligned, and cleaned. The resulting fiber web is transferred from the drum to a doffer, which is followed by a device for converting the fiber web into a fiber sliver.

[0014] The invention includes the technical teaching that the diameter of the drum is at least 1300 mm and the distance difference between the front and rear heel of a flat clothing of a flat bar over a width of 20 mm to the clothing of the drum is less than 12 / 1000" [inch], i.e. 0.30 mm. Due to the increased radius of curvature, which brings the carding surface between the flat bar and the drum closer to the ideal state of a straight carding surface, the carding gap becomes more constant across the width of the flat bar. This distance difference can also occur with a narrower or wider clothing, for example 25 mm or 30 mm wide. The distance difference is determined over a measured distance in the width of 20 mm, even if the clothing has a smaller or larger width. The carding intensity increases, regardless of the length of the carding surface.Contrary to the opinion of all experts who consider a carding drum size significantly below 1300 mm to be technically feasible and sensible, the invention makes the carding gap more constant across the width of the flat bar due to the increased radius of curvature of the drum, which brings the carding surface between the flat bar and the drum closer to the ideal state of a straight carding surface. By increasing the drum diameter to at least 1300 mm, the gap difference between the rear and front heel of the clothing of a flat bar can be reduced by at least 4 / 1000" (0.1 mm) compared to the state of the art, thereby increasing carding performance and carding quality without having to install a higher power.On the contrary, the carding machine can be operated with reduced drive power, since the increased diameter accelerates the drum mass to a lower speed and can be operated at this speed than with the current state of the art. A further advantage is the larger surface area of ​​the drum, which can thus dissipate more heat and deforms less when heated. The essential dimensions of the carding machine are determined by varying the drum diameter in conjunction with the carding length.

[0015] In combination with the previously stated drum diameter, the carding length, which is determined by a partial circumference of the drum between the contact point of the licker-in and drum and the contact point between the drum and doffer, can be at least 3170 mm. This increases the carding intensity without having to move the licker-in and doffer under the drum, which would make the card unstable in running behavior and require a larger design. The disadvantages of the prior art, namely the vibration associated with the increased overall height, are compensated for by the arrangement of the licker-in and doffer. Since these rollers are arranged in almost the same circumferential angular range as in the applicant's previous card, vibrations and thus uneven running do not occur, nor is the overall height of the card significantly increased.

[0016] Increasing the drum diameter while maintaining approximately the same carding length results in a more favorable arrangement of the licker-in and doffer, resulting in only a slight increase in card height. At the same time, the gap difference between the flat bar clothing and the drum clothing is reduced.

[0017] If the drum diameter is increased to at least 1400 mm, the gap difference at the flat bar clothing can be further reduced. The distance difference between the front and rear heel of a flat flat bar clothing over a width of 20 mm to the drum clothing is then a maximum of 11 / 1000" [inch], or 0.28 mm. This distance difference can also occur with a wider or narrower clothing, for example, 25 mm or 30 mm wide. The distance difference is determined over a measured distance in the width of 20 mm, even if the clothing has a smaller or larger width.

[0018] With an assigned carding length of at least 3190mm, the carding performance and carding quality are ensured with reduced drive power.

[0019] Another independent claim is based on a carding machine with an inlet side for fiber tufts, wherein the carding machine is designed to feed the fiber tufts to a rotating drum by means of at least one licker-in. The fiber tufts are opened up to the individual fibers, aligned, and cleaned between fixed carding elements and rotating flat bars and the drum. The resulting fiber web is transferred from the drum to a doffer, which is followed by a device for converting the fiber web into a fiber sliver. The invention provides that the diameter of the drum is at least 1300 mm and that the carding length, which is determined by a partial circumference of the drum between the contact point of the licker-in and the drum and the contact point between the drum and the doffer, is at least 3170 mm.

[0020] By increasing the drum diameter beyond the limit set by experts, the carding length, which is determined by a partial circumference of the drum between the contact point of the licker-in and drum and the contact point between the drum and doffer, can be increased. This increases the carding intensity without having to move the licker-in and doffer beneath the drum, which would make the card unstable in running behavior and require a larger design. The disadvantages of the prior art, namely the vibration associated with the increased overall height, are compensated for by the arrangement of the licker-in and doffer. Since these rollers are arranged in almost the same circumferential angular range as in the applicant's previous card, vibrations and thus uneven running do not occur, nor is the overall height of the card significantly increased.

[0021] A further improvement can be achieved by ensuring that the distance difference between a front and a rear heel of a flat clothing of a flat bar over a width of 20 mm to the clothing of the drum is less than 12 / 1000" [inch] (0.30 mm). Due to the increased radius of curvature of the drum, which brings the carding surface between the flat bar and the drum closer to the ideal state of a straight carding surface, the carding gap becomes more constant across the width of the flat bar. This distance difference can also occur with a narrower or wider clothing, for example 25 mm or 30 mm wide. The distance difference is determined over a measured distance in the width of 20 mm, even if the clothing has a smaller or larger width. The carding intensity increases, regardless of the length of the carding surface.

[0022] The carding intensity can be further increased by enlarging the drum to a diameter of at least 1400mm, so that with the same arrangement of licker-in and doffer the carding length is at least 3190mm.

[0023] If the distance difference between a front and a rear heel of a flat clothing of a flat bar over a width of 20 mm to the clothing of the drum of a maximum of 11 / 1000" [inch] (0.28 mm), the carding intensity is further increased. This distance difference can also occur with a wider or narrower clothing, which has a width of 25 mm or 30 mm, for example. The distance difference is determined over a measured distance in the width of 20 mm, even if the clothing has a smaller or larger width.

[0024] By enlarging the drum, at least 38 flat bars of a revolving flat can be permanently engaged with the drum. Increasing the number of engaged flats allows for better dissipation of the heat generated by carding. At the same time, carding performance and quality are increased.

[0025] The fact that the revolving flat is arranged symmetrically to a vertical centerline through the drum axis results in further advantages for the card's overall height, as the licker-in and doffer do not need to be positioned further below the drum despite the increased carding length. Heat is also dissipated more evenly due to the carding power generated.

[0026] Preferably, the circumferential angle formed by the carding length between the contact point of the licker-in and the drum and the contact point between the drum and the doffer is a maximum of 280°, preferably a maximum of 270°. Since, according to the invention, the increased carding length is achieved by increasing the drum diameter, the limited circumferential angle ensures a low overall height of the card, since the licker-in and doffer interact with the drum in almost the same position as before.

[0027] By arranging the licker-in and doffer at virtually the same position relative to the drum, the height between the underside of the frame and the drum axis is a maximum of 1230 mm. This advantageously allows the existing frame design with bearings to be continued with only minor adjustments.

[0028] Because the drum's maximum working width is 1300 mm, thermal stress has a less significant impact on carding gap changes than with the current technology. Especially in combination with the larger drum diameter, centrifugal force can be reduced, as the drum can be operated at a lower speed while maintaining the same productivity.

[0029] Preferably, the carding machine is designed to operate the drum at a maximum peripheral speed of 2450 m / min, whereby the drive power can be reduced and at the same time the centrifugal force is limited.

[0030] With the increase in drum diameter, the simultaneous symmetrical arrangement of the enlarged revolving flat and the previously almost unchanged position of the licker-in to the drum, the pre-carding area is enlarged, which can now accommodate an additional cleaning element of a suction hood with or without a knife, or an additional fixed carding element. Although the circumferential angle of the pre-carding area decreases due to the enlargement of the revolving flat, the larger drum diameter increases the circular arc of the pre-carding area to at least 900mm on the circumference of the drum. This allows the flat circuit of the revolving flat to be further relieved, which increases the service life of the flat bar clothings and improves carding quality. According to the state of the art, eight cleaning elements are arranged between the suction hood below the revolving flat and the licker-in.The pre-carding area expands in a circular arc to at least 900 mm, with the circular arc in the pre-carding area being defined from the center of the licker-in engaging the drum to the center of the revolving flat deflection roller. This allows the elements of the pre-carding area to be enlarged along the circumference of the angle, or an additional cleaning or fixed carding element can be used.

[0031] Further measures improving the invention are described in more detail below together with the description of a preferred embodiment of the invention with reference to the figures.

[0032] They show:

[0033] Figure 1: a side view of a schematically illustrated carding machine according to the

[0034] State of the art;

[0035] Figures 2a - 2c: further schematically illustrated cards according to the state of the art;

[0036] Figure 2d: a schematically illustrated carding machine of the invention;

[0037] Figure 3: an enlarged view of a flat bar with the curvature of a

[0038] Drum;

[0039] Figure 4: an enlarged view of the pre-carding zone;

[0040] Figure 4a: an enlarged detail view in the area of ​​the licker-in.

[0041] Fig. 1 shows a prior art carding machine in which fiber flakes are guided via a chute to a feed roller 1, a feed table 2, via several licker-in rollers 3a, 3b, 3c, to the drum 4 or the reel tambour. On the drum 4, the fibers of the fiber flakes are parallelized and cleaned by means of stationary and rotating carding elements. The resulting fiber web is then conveyed via a doffer 5, a stripping roller 6 and several squeezing rollers 8, 9 to a web guide element 10, which forms the fiber web into a fiber sliver using a funnel 11. The sliver is then transferred to a downstream processing machine or a can 15 via take-off rollers 12, 13. The removal of the fibers from the doffer 5 is assisted by a web guide profile 7, which is arranged below the stripping roller 6.Above the stripping roller 6, a cleaning roller 6a is arranged, with which fiber residues are removed from the stripping roller 6 and fed to a suction device not further designated.

[0042] Figure 2a shows a schematic representation of a carding machine manufactured by the applicant and marketed under the product designation TC19. The carding machine has a drum diameter (without clothing) of 1287 mm and a working width of 1280 mm. The revolving flat 16 has a total of 84 flat bars 17, of which 28 flat bars are constantly engaged with the clothing of the drum 4. The carding length KL (=angled arc) is 2800 mm across the drum circumference, which corresponds to an active circumferential angle of 250° between the center of the licker-in 3c and the center of the doffer 5. At a maximum speed of approximately 600 rpm, the maximum peripheral speed is 2450 m / min. The carding length KL is made up of the pre-carding area VK, the main carding area HK, and the post-carding area NK. The pre-carding area VK is determined by the angular circumference on the drum 4 between the center of the licker-in 3c and the center of the first deflection roller 16a of the revolving flat.The main carding area HK ​​corresponds to the flat circulation area of ​​the revolving flats 16 with the revolving flats 17 on the drum 4, which is determined by the angular circumference between the center of the deflection rollers 16a and 16b on the drum circumference. The angular circumference of the post-carding area NK extends from the center of the deflection roller 16b to the center of the doffer 5 on the drum circumference.

[0043] Figure 2b shows a schematic card geometry of a prior art carding machine with a smaller drum diameter of 1180mm and a working width of 1500mm. The revolving flat 16 has a total of 116 flat bars 17, of which 40 flat bars are constantly engaged with the clothing of the drum 4. The carding length KL across the drum circumference (=angle arc) is 3160mm, which corresponds to an active circumferential angle of 307° between the center of the licker-in 3c and the center of the doffer 5. At a maximum speed of 600 rpm, the circumferential speed is approximately 2224 m / min. The increased working width of 1500mm compared to the prior art has the disadvantage that the thermal influence on the carding gap is greater, since the drum 4 assumes a convex shape as the temperature increases.Despite the smaller diameter of the drum 4, this card is very tall, as the licker-in 3c and the doffer 5 have been relocated beneath the drum 4 to increase the carding length. The frame 18 was designed accordingly, placing the drum 4 higher than in the prior art. The lower arrangement of the licker-in 3c and the doffer 5 created space to pull the revolving flat 16 down into the area of ​​the licker-in 3c. This peripheral area on the drum was previously used by fixed carding elements in combination with suction hoods and separating elements. This embodiment is described in EP 3162927 A1.

[0044] Another state-of-the-art carding geometry is shown in Figure 2c, which features a drum 4 diameter of 1017 mm and a working width of 1500 mm. The revolving flat has a total of 101 flat bars, of which 36 flat bars are permanently engaged with the clothing of drum 4. The carding length KL (=angle arc) is 2620 mm, which corresponds to an active circumferential angle of 295° between the center of the licker-in 3c and the center of the doffer 5. This embodiment is described in document IN351271 B.

[0045] The invention avoids the previous disadvantages by using a card with a drum diameter of at least 1300 mm, preferably at least 1350 mm, with a constant working width of 1280 mm. Figure 2d shows a schematic embodiment of the card according to the invention with a drum diameter of 1400 mm. The carding length KL is 3190 mm, which corresponds to an active circumferential angle between the center of the licker-in 3c and the center of the doffer 5 of 261°. In this embodiment, the revolving flat 16 has a total of 105 flat bars 17, of which 38 flat bars are constantly engaged with the clothing of the drum 4. The engaged flat bars 17 are distributed symmetrically over the center line arranged perpendicular to the drum axis, so that the carding heat is also dissipated symmetrically over the drum circumference.The increase in carding length KL is achieved by increasing the drum diameter, whereby the arrangement of the licker-in 3c and the doffer remains virtually unchanged. The frame 18 can retain its wide support structure without restricting the installation space of the licker-in 3c and the doffer 5. Thus, with a drum diameter of at least 1300 mm, the height H of a maximum of 1230 mm from the underside of the frame to the drum axis can be maintained. Another significant advantage is the increased radius of curvature, which brings the carding surface between flat bar 17 and drum 4 closer to the ideal state of a straight carding surface. The carding gap across the width of flat bar 17 becomes more constant.

[0046] Figure 3 shows an enlarged view of a flat bar 17 with a clothing 17a, which is set at its rear heel Fh to a distance of 3 / 1000" [inch], i.e. 0.076 mm distance, from the clothing of the drum 4 (not shown). In this exemplary embodiment, for the following diagram, all flat bars 17 have a uniform flat dimension of 20 mm across the width of the clothing 17a. Due to the curvature of the drum 4, a dimension X results at the front heel Fv of the clothing 17a, which varies with the curvature of the drum 4.

[0047] Flat bar set to carding gap 3 / 1 OOO"[inch]

[0048] The first value according to the state of the art shows the example of a carding machine known on the market with a drum diameter of 800 mm and a gap X of 23 / 1000"[inch], i.e. 0.7 mm.

[0049] The further values ​​for the gap X relate to the examples in Figure 2c with 19 / 1000" [inch] (0.48mm) for a drum diameter of 1017mm, Figure 2b with X = 16 / 1000" [inch] (0.41mm) for a drum diameter of 1180mm, and Figure 2a with X = 15 / 1000" [inch] (0.38mm) for a drum diameter of 1287mm.

[0050] Finally, it can be seen that when the drum 4 is enlarged according to the invention to at least 1300 mm, the dimension X at the front heel Fv of the clothing 17a decreases even further, namely below 15 / 1000" [inch] (0.38 mm), and in the embodiment of 1400 mm to even 14 / 1000" [inch] (0.356 mm). This results in a distance difference between the front and rear heel (Fv-Fh) of a flat 20 mm wide clothing 17a of a flat bar 17 to the clothing of the drum 4, regardless of the setting of the carding gap (here 3 / 1000"), of less than 12 / 1000" [inch] (0.30 mm) for a drum 4 with a diameter of 1300 mm and a distance difference of 11 / 1000" [inch] (0.28 mm) for a drum 4 with a diameter of 1400 mm. The dimension X can also result for a narrower or wider clothing, which for example has a width of 25 mm or 30 mm.However, dimension X is determined over a measured distance of 20mm in width, even if the clothing has a smaller or larger width. Increasing the drum diameter can increase the peripheral speed at the same speed, which may impair the carding quality for some, but not all, fiber qualities. At the same time, the centrifugal force increases. For this reason, the drum speed is limited so that a peripheral speed of 2450 m / min is not exceeded. To achieve this, it can be advantageous to limit the speed of drum 4 to 560 rpm, for example with a drum diameter of 1400mm. This not only saves energy given the large mass, but also means the card runs more smoothly due to the reduced speed, as the centrifugal force is limited.

[0051] At the same time, increasing the number of engaged flat bars to 38 improves heat dissipation due to the carding performance. Increasing the drum diameter simultaneously limits the thermal load and thus the deformation of drum 4, as it has a larger surface area for heat dissipation and reduces convex deformation.

[0052] The measures according to the invention achieve improved carding quality and reduce the known negative side effects caused by the high drum speed and the associated high temperature difference. As a result, the carding and associated yarn quality improve. This can save raw material costs or increase productivity. Alternatively, the carding intensity can be reduced, and the potential quality gain can be converted into energy savings.

[0053] Figures 4 and 4a show the details of the pre-carding area VK, which has increased in size in the circular arc due to the increase in the drum diameter, since the symmetrical arrangement of the revolving flat 16 and the previously almost unchanged position of the licker-in 3c relative to the drum 4 remain unchanged. Although the angle or angular arc of the pre-carding area has decreased slightly, the larger drum diameter has increased the available circular arc of the pre-carding area VK to at least 900 mm on the drum circumference. On the two side plates 20 (only one is visible here) of the card, which hold the drum 4 between them, a flexible bend 21 is each mounted on the outside of the side plate 20, the radius of which can be adjusted relative to the drum 4 by means of fastening elements 22.Cleaning elements such as suction hoods 23, 27, fixed carding elements 24, gusset profiles 26, cover elements 25, or other cleaning elements are arranged on the flexible bend 21. By increasing the drum diameter, the pre-carding area in the angled bend on the drum circuit can be enlarged with the same arrangement of the licker-in and a simultaneous symmetrical arrangement of the enlarged revolving flat 16. The angled bend of the pre-carding area VK is thus enlarged and can accommodate an additional cleaning element of a suction hood 27 with or without a knife, or an additional fixed carding element 24. This additionally relieves the load on the flat circuit of the revolving flat 16, which increases the service life of the clothings of the flat bars 17 and improves carding quality. According to the state of the art, eight cleaning elements are arranged between the suction hood 23 below the revolving flat 16 and the licker-in 3c.The pre-carding area expands in an angular arc around the drum circumference to at least 900 mm, with the angular arc in the pre-carding area VK being determined from the center of the licker-in 3c engaging the drum 4 to the center of the deflection roller 16a of the revolving flat 16. This allows the elements of the pre-carding area to be enlarged along the angular circumference, or an additional cleaning or fixed carding element can be used. In Figure 4, the additional element has not yet been installed; instead, a simple cover element 25 has been inserted there. In Figure 4a, the cover element 25 has been replaced by a fixed carding element 24, which performs additional carding. Instead of the fixed carding element 24, an extraction hood with or without a knife or an additional cleaning element can also be used.

[0054] Reference symbol

[0055] 1 feed roller

[0056] 2 dining tables

[0057] 3a, b, c licker-ahead

[0058] 4 drums

[0059] 5 customers

[0060] 5a set

[0061] 6 scraper roller

[0062] 6a cleaning roller

[0063] 7 Fleece guide profile

[0064] 8 Squeeze roller

[0065] 9 Squeeze roller

[0066] 10 fleece guide element

[0067] 11 funnels

[0068] 12 Take-off roller

[0069] 13 Take-off roller

[0070] 14 Fixed carding element

[0071] 15 cans

[0072] 16 revolving lids

[0073] 17 Flat bar

[0074] 17a set

[0075] 18 frame

[0076] 20 Side plate

[0077] 21 flexible arches

[0078] 22 Fastening element

[0079] 23 Extractor hood

[0080] 24 fixed carding element

[0081] 25 Cover element

[0082] 26 gusset profile

[0083] 27 Extractor hood

[0084] Fh rear heel

[0085] Fv anterior heel

[0086] H Height

[0087] HK main carding area

[0088] NK post-carding area

[0089] VK pre-carding area

[0090] KL carding length

[0091] X gap

Claims

Patent claims 1. Carding machine with an inlet side for fiber flakes, wherein the carding machine is configured to feed the fiber flakes to a rotating drum (4) by means of at least one pre-tearer (3a, 3b, 3c), wherein the fiber flakes are broken down, aligned and cleaned between fixed carding elements and circulating cover bars (17) and the drum (4) down to the individual fiber, and the resulting fiber sliver can be transferred from the drum (4) to a receiver (5) to which a device for converting the fiber sliver into a fiber ribbon is arranged, characterized in that the diameter of the drum (4) is at least 1300 mm and the difference in distance between a front and a rear heel (Fv-Fh) of a flat set (17a) of a cover bar (17) over a width of 20 mm to the set of the drum (4) is less than 12 / 1000" [inch].

2. Carding machine according to claim 1, characterized in that the carding length (KL), which is determined by a partial circumference of the drum (4) between the contact point of pre-tearer (3c) and drum (4) and the contact point between drum (4) and take-up (5), is at least 3170mm.

3. Carding machine according to claim 1, characterized in that the diameter of the drum (4) is at least 1400mm and the difference in distance between the front and rear heel (Fv-Fh) of a flat set (17a) of a cover bar (17) over a width of 20mm to the set of the drum (4) is a maximum of 11 / 1000" [inch].

4. Carding machine according to claim 3, characterized in that the carding length (KL) is at least 3190mm.

5. Carding machine with an inlet side for fiber flakes, wherein the carding machine is configured to feed the fiber flakes to a rotating drum (4) by means of at least one pre-tearer (3a, 3b, 3c), wherein the fiber flakes are broken down, aligned and cleaned between fixed carding elements and circumferential cover bars (17) and the drum (4) down to the individual fiber, and the resulting fiber sliver can be transferred from the drum (4) to a take-up device (5) to which a device for converting the fiber sliver into a fiber ribbon is arranged, characterized in that the diameter of the drum (4) is at least 1300 mm and that the carding length (KL), which is determined by a partial circumference of the drum (4) between the contact point of pre-tearer (3c) and drum (4) and the contact point between drum (4) and take-up device (5), is at least 3170 mm.

6. Carding according to claim 5, characterized in that the difference in distance between a front and a rear heel (Fv-Fh) of a flat set (17a) of a lid rod (17) over a width of 20mm to the set of the drum (4) is less than 12 / 1000" [inch].

7. Carding machine according to claim 5, characterized in that the diameter of the drum (4) is at least 1400mm and that the carding length (KL) is at least 3190mm.

8. Carding according to claim 7, characterized in that the difference in distance between a front and a rear heel (Fv-Fh) of a flat set (17a) of a lid rod (17) over a width of 20mm to the set of the drum (4) is a maximum of 11 / 1000" [inch].

9. Carding machine according to one of the preceding claims, characterized in that at least 38 cover bars (17) of a circumferential traveling cover (16) are permanently engaged with the drum (4).

10. Carding machine according to claim 9, characterized in that the circumferential traveling cover (16) is arranged symmetrically to a vertical center line through the axis of the drum (4).

11. Carding machine according to one of the preceding claims, characterized in that the circumferential angle formed by the carding length (KL) between the contact point of pre-tearer (3c) and drum (4) and the contact point between drum (4) and take-up (5) is a maximum of 280°, preferably a maximum of 270°.

12. Carding machine according to one of the preceding claims, characterized in that the pre-carding area (VK) has at least one angular arc on the drum circumference of at least 900 mm.

13. Carding machine according to claim 12, characterized in that the pre-carding area is designed to accommodate at least nine cleaning elements.

14. Carding machine according to one of the preceding claims, characterized in that the height between the underside of the frame (18) and the axis of the drum (4) is a maximum of 1230mm.

15. Carding machine according to one of the preceding claims, characterized in that the working width of the drum (4) is a maximum of 1300mm. Carding machine according to one of the preceding claims, characterized in that the carding machine is designed to operate the drum (4) at a maximum peripheral speed of 2450m / min.

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