CN117265815A - Device for producing rolls of cotton fibre - Google Patents

Abstract

The invention relates to a device for producing a fleece (18) from a plurality of fiber strands (4). The device comprises a frame (30) and at least one drafting mechanism (6) with a pair of input rollers (7) and a pair of output rollers (9), as well as a calendaring process (17) and a winding assembly. At least one drawing mechanism (6) is designed to draw the fibrids (4) and form a pre-batt (10). The calendering process (17) is arranged downstream of the at least one drawing mechanism (6) in order to form a batt web (18). At least one drafting mechanism (6) and the calendaring process (17) and winding assembly are held in a frame (30). A travel path (A) for the pre-fleece web (10) is provided between a pair of output rollers (9) of at least one drafting mechanism (6) and an inlet into a clamping line (32) formed in the calendering process (17) of 200mm to 500mm.

Description

Device for producing rolls of cotton fibre

Background

The invention relates to a device for producing a batt from a plurality of fiber strands, comprising a frame and at least one drawing mechanism having a pair of inlet rollers and a pair of outlet rollers, as well as a calendering process and a winding assembly. At least one drawing mechanism is configured to draw the sliver and form a pre-batt. The calendering process is arranged downstream of the at least one drafting mechanism so as to form a batt web.

After its production is completed, the batt is fed to a combing machine and used as a template for combed yarn production. Thus, the quality and uniformity of the produced batt roll directly affects the quality of the fiber bundles produced by the combing process.

A device of the type in question for producing rolls of batting is known, for example, from EP 0 718 422 A1. Wherein a plurality of fiber strands are fed into the device. The fiber sliver is removed from the provided container and fed as a fiber sliver to a drawing mechanism. In the disclosed device, the fibre strips are processed in each case in two drafting mechanisms and converted into a pre-batt web. A fiber ribbon is understood to mean an arrangement of fiber strands upstream of the drawing mechanism, which are placed next to one another and fed into the input rollers of the drawing mechanism. The pre-batting webs from the two drafting mechanisms are then placed on top of each other and fed to the third drafting mechanism. Downstream of the third drafting mechanism, the pre-batt web, which is combined to form the pre-batt web, reaches the calendering process. The calendering process is performed as multiple calenders. During calendering, the pre-batt web is pressed between the various calender rolls and directed to a winding assembly by several nip points. The winding assembly is designed as a roll winder, in which case a roll of batt is formed between two winding rolls on the core. A disadvantage of the disclosed device is that the distance that a single pre-batt web travels before reaching the calendering process is long. This also necessitates a third drawing mechanism to achieve good quality of the pre-batt and homogenization of the fibre layers in the pre-batt by combining the drawing processes of the pre-batt. IN 201514024A also discloses an apparatus for making rolls of batting having a winding assembly and two drafting mechanisms for forming a pre-batting web. The drafting mechanism is arranged upstream of the winding assembly, as a result of which the superimposed pre-batt web has to travel a longer distance before entering the calender. The transport of the pre-batt after the drafting mechanism is achieved by calendering. Calendering causes the pre-batt web to be pulled, which will result in a loss of quality with a longer conveying path and thus a higher weight of the mass of the pre-batt web to be pulled. The pre-batting web may also be stretched by a pulling force, which may result in defective pulling. The result of this defective pulling is the introduction of unevenly pulled pre-batt into the calendering process. In the case of non-ideal transport supports on which the pre-fleece has to be guided, the uppermost fibres of the pre-fleece can also be damaged due to the transport path.

IN 2012che 2812A, furthermore, discloses an apparatus for producing rolls of cotton fibre with a winding assembly and multiple calendering without an upstream drafting mechanism. The fiber strands previously drawn in a separate process are fed directly from the vessel to the calendering process. In this case too, it is disadvantageous that the individual fiber strands cover transport paths of different lengths, which can lead to defective drawing.

Disclosure of Invention

The object of the invention is therefore to design the supply of pre-batting web so that high quality windings can be formed and defective pulling avoided.

To achieve this object, an apparatus for producing a batt roll from a plurality of fiber strands is proposed, the apparatus having a frame, wherein the apparatus comprises at least one drafting mechanism having a pair of input rollers and a pair of output rollers, and an calendaring process and a winding assembly. The at least one drawing mechanism is designed to draw the sliver and form a pre-batt web. Calendering is arranged downstream of the at least one drafting mechanism to form a batt web. At least one drafting mechanism and a calendaring and winding assembly are held in the frame. By combining the individual components of the device into a single chassis, a compact design of the entire device is possible. This also results in a smaller footprint for the spinning preparation or fiber preparation device in the spinning mill. The travel path provided for the pre-batt web between the pair of output rollers of at least one drafting mechanism and the entrance into the nip line formed in the calendering is 200mm to 500mm. It has been found that the best results of the quality of the batt roll are achieved in the case of a travel path of the batt web from the start roller to the calendering process of 200mm to 400mm, in particular 300 mm. In the case of an excessively large travel path exceeding 500mm, the disadvantages of the prior art are only slightly alleviated. If a smaller travel path is selected, the structural complexity of the device may increase. Due to the small travel path that creates the pre-batt web, a defective pull between a pair of starting rollers of the drafting mechanism and the entrance of the first nip line into the calendering process is avoided. Between the pair of start rollers of the drafting mechanism and the inlet of the first clamping line into the calendering process, the pre-web also has only minimal contact with the guiding element, thus minimizing damage to the surface of the pre-web.

The calendering process consists of at least two rolls that are pressed against each other to form a web of as tight as possible, which is then fed into a winding assembly. At least two calender rolls form a nip line therebetween into which the pre-batt is inserted and form a batt. Today, in most cases, two different winding machines are used as winding assemblies. On the one hand, so-called roll winders are used, in which the lap is formed on a winding reel. In a second embodiment, in a so-called tape winder, the rolls are formed in a circumferential tape. In both the belt and roll winders, one or more pairs of calender rolls are installed upstream of the actual winding process. The calendering process compresses and compresses the web before it enters the winding assembly.

Advantageously, the drafting mechanism has at least one pair of central rollers between a pair of input rollers and a pair of output rollers. By inserting a pair of center rollers between a pair of input rollers and a pair of output rollers, the pulling action on the fiber ribbon by the draft mechanism is divided into two regions. As a result, a preliminary pulling is performed between the pair of input rollers and the pair of center rollers, and a main pulling is performed between the pair of center rollers and the pair of output rollers. Thus, higher pulls or the same overall pull can be achieved in smaller steps. By creating multiple pulling domains, the fibrids can be gently pulled.

Preferably, two drafting mechanisms are provided. By using two drafting mechanisms, two pre-batting webs can be stacked on top of each other to produce a batting web. The individual pre-batting webs are formed from thinner fiber strands or the fiber strands can be drawn more in a drawing mechanism. Both measures improve the quality of the pre-batt and thus the overall improvement of the batt. The pre-batting webs are stacked on top of each other and joined by a calendaring process to form a batting web.

Advantageously, the drafting mechanisms are arranged at an inclination in opposite directions. An advantage of this arrangement is that the pre-batt web formed by the drafting mechanism is subjected to the same conveying conditions before they are combined. In this case, it is advantageous if the travel path provided for the second pre-batt web between the pair of output rollers of the second drafting mechanism and the inlet into the calendering process is also 200mm to 500mm. Thus, it is preferred that the travel path provided for the first pre-batt web between the pair of output rollers of the first drafting mechanism and the inlet into the calendering process is identical to the travel path provided for the second pre-batt web between the pair of output rollers of the second drafting mechanism and the inlet into the calendering process. This has the advantage that: both pre-batting webs were subjected to the same conditions. Due to the short travel path, a defective pulling is largely avoided, wherein the stresses of the two pre-batting webs are at least identical, which counteracts possible irregularities in the batting web to be formed.

Advantageously, the drafting mechanisms are arranged one above the other and a superposition of the pre-batt web formed by the drafting mechanisms is provided before the calendering process. By means of the vertical stacking arrangement of the drafting devices, a compact and space-saving design is possible and the drafting devices can be accommodated in the machine frame. No separate support of the drafting mechanism is required as today. Furthermore, by this geometrical arrangement of the drafting mechanism, the pre-fleece webs can be stacked on top of each other before calendering without the presence of different travel paths for the individual pre-fleece webs. Combining the pre-batt prior to calendering causes the pre-batt to be accurately introduced into the calendering process. Thus, deformation or clogging of the surface of the pre-batt as it enters the calendering process, as well as damage, can be minimized.

Preferably, the calendering process is provided by a single pair of calender rolls forming a nip line. An advantage compared to calendering with a plurality of nip lines is that the surface of the web is not disturbed by the transport over several roll surfaces, thereby avoiding damage to the surface of the web or to the fibres located on the surface. It has also been shown that a sufficiently high pressure between a pair of calender rolls is sufficient to achieve a high quality batt roll with a single press of the batt web. Depending on the characteristics of the pre-batt before a pair of calender rolls and the requirements for the pressed batt after passing through the nip line, a nip force of 8kN to 30kN is sufficient.

Preferably, the element for guiding the pre-batting web is arranged upstream of the clamping line. The element is used to achieve a clamping line for the precise introduction of the pre-batt into the calendering process. Guide bars, tables or surfaces may be used as elements for guiding the pre-batt. These can be designed as sheet metal structures or correspondingly shaped or machined profiles. The pre-batting web may be guided by or between the guide surfaces. Rolls or rollers may also be used if the pre-batting web is directed on both sides. The guiding surfaces may accordingly move vertically together or, in the case of rolls, with the pre-batt web. In this case, it is advantageous if the distance between the respective outlet of the drafting mechanism and the element for guiding the pre-fleece is the same. Here, too, this principle applies: only the uniform treatment of the pre-batt results in the desired high quality batt.

For further processing of the web, the winding assembly has a circumferential belt for winding the web onto the core, wherein in the frame at least five rollers are rotatably mounted around which the belt rotates. In an alternative embodiment, the winding assembly has first and second winding rollers for winding the web onto the core and a housing, wherein the winding rollers are rotatably mounted in the frame. These alternative designs of winding assemblies are known, both of which are suitable for winding a web of batting formed by the device according to the present invention. For a more detailed description of the winding assembly, please refer to the accompanying figures.

Drawings

Further advantages of the invention are shown and described in more detail in the following examples. In the drawings:

fig. 1 is a schematic view of an apparatus for manufacturing a cotton web according to the prior art;

FIG. 2 is a schematic view of a first embodiment of an apparatus according to the present invention;

FIG. 3 is a schematic view of a second embodiment of an apparatus according to the present invention; and

fig. 4 is a schematic view of a third embodiment of the device according to the invention.

Detailed Description

Fig. 1 is a purely schematic view of an apparatus for manufacturing a web 18 of batting according to the prior art. The device comprises a first drafting mechanism 6, a second drafting mechanism 11 and a calendaring process 17. The fibre sliver 5, which consists of individual fibre slivers, is fed to a first drawing frame 6. The pairs of drafting mechanism rollers of the first drafting mechanism 6 form a first pre-batt web 10 from the fibre strip 5, which is guided away from the first drafting mechanism 6 in the direction of the second drafting mechanism 11 (shown by the arrow). The fibre sliver 5 consisting of individual fibre slivers is likewise fed to the second drawing frame 11. A second pre-batt web 15 is formed from the fiber ribbon 5 by a plurality of pairs of drawing mechanism rollers of the second drawing mechanism 11. The second pre-cotton web 15 is then placed on the first pre-cotton web 10. The superimposed pre-batting webs 15 and 10 are then fed together in the running direction 16 into a calendering process 17. By way of example, the calendering process 17 is shown as a quad calender in which the pre-batt web is directed through three nip lines formed by four calender rolls. Calendering process 17 forms batt web 18 from pre-batt webs 15 and 10. Due to the arrangement of the drafting mechanisms 6 and 11, the travel paths of the pre-batting webs 15 and 10 are different and therefore also subject to different tensions caused by the transport.

After the calendaring process 17, the batt web 18 is fed into the winding assembly of the belt winder and wound onto the core 21 to form a batt roll 19 rotatably mounted about a fixed winding axis 20. The core 21 is driven by an endless belt 23, by means of which a loop 26 is formed between a deflection roller 24 and a tapping roller 25, in which loop the core 21 or the fleece roll 19 is received. In this example, the fleece 19 is driven counter-clockwise in the direction of rotation 22 by the belt 23. The loop 26 of the tape 23 wound around the batt roll 19 becomes larger as the size of the batt roll 19 increases, wherein the tape 23 is tensioned by the tensioning roller 29 throughout the winding process. The belt 23 is further guided by an ejecting roller 27 and a guiding roller 28.

Fig. 2 is a schematic view of a first embodiment of the device according to the invention. The apparatus comprises a drafting mechanism 6, a calendaring process 17 and a winding assembly held in a common frame 30. The frame in turn stands on a foundation 31. The container 1 containing the fibre sliver 4 to be treated is also mounted on a foundation 31. Above the container 1 a creel 2 is arranged. The fibre sliver 4 is transported from the container 1 to the device by means of a creel roll 3 arranged on the creel 2 and fed as fibre sliver 5 to a drafting mechanism 6. In this case, a certain number of fiber strips 4 arranged next to each other is called a fiber strip 5. The draft mechanism 6 has a pair of input rollers 7 and a pair of output rollers 9. The fibre strip 5 is subjected to deformation and converted into a pre-batt 10 by means of a drafting mechanism 6 or drafting mechanism rollers 7 and 9 running at different speeds. The pre-cotton web 10 is fed into a calendering process 17. The pre-batt 10 is converted into a batt 18 by a calendering process 17. The calendering process 17 is represented by a pair of calender rolls forming a pinch line 32 therebetween. On its way from the drafting mechanism 6 to the calendering process 17, the pre-batting web 10 covers a travel path a between a pair of output rolls 9 and the entrance to the nip line 32 of the calendering process 17. The element 33 is provided for the undisturbed guiding of the pre-fleece 10 from the drafting mechanism 6 to the clamping line 32. In the case of a corresponding tight arrangement of the drawing mechanism 6 and the calendering process 17, the elements 33 for guiding the pre-fleece 10 can also be omitted. The element 33 is shown by way of example as a guide profile.

For example, the illustration shows a tape winder as a winding assembly. After the calendaring process 17, the batt web 18 is fed into a belt winder and wound onto a core 21 to form a batt roll 19 rotatably mounted about a fixed winding axis 20. The core 21 is driven by an endless belt 23, by means of which a loop 26 is formed between a deflection roller 24 and a tapping roller 25, in which the core 21 or the fleece roll 19 is received. In this example, the fleece 19 is driven counter-clockwise in the direction of rotation 22 by the belt 23. The loop 26 of the tape 23 wound around the batt roll 19 becomes larger as the size of the batt roll 19 increases, wherein the tape 23 is tensioned by the tensioning roller 29 throughout the winding process. The belt 23 is further guided by an ejecting roller 27 and a guiding roller 28.

Fig. 3 is a schematic view of a second embodiment of the device according to the invention. The device comprises a first drawing mechanism 6 and a second drawing mechanism 11 held in a common frame 30, a calendering process 17 and a winding assembly. The frame in turn stands on a foundation 31. The container 1 containing the fibre sliver 4 to be treated is also mounted on a foundation 31. Above the container 1 a creel 2 is arranged. The fibre sliver 4 is fed from the container 1 to the device by means of a creel roll 3 arranged on the creel 2 and fed as fibre sliver 5 to a first drafting mechanism 6 and as further fibre sliver 5 to a second drafting mechanism 11. The first drafting mechanism 6 has a pair of input rollers 7, a pair of center rollers 8, and a pair of output rollers 9. The fibre strip 5 is subjected to deformation and converted into a first pre-batt web 10 by a first drafting mechanism 6 or by running the drafting mechanism rollers 7, 8 and 9 at different speeds. The second drafting mechanism 11 has a pair of input rollers 12, a pair of center rollers 13, and a pair of output rollers 14. The fibre strip 5 is subjected to deformation and converted into a second pre-batt web 15 by means of a second drafting mechanism 11 or drafting mechanism rollers 12, 13 and 14 running at different speeds.

The first pre-cotton web 10 and the second pre-cotton web 15 are stacked on top of each other and fed into the calendering process 17. Calendering process 17 forms batt web 18 from pre-batt webs 10 and 15. The calendering process 17 is represented by a pair of calender rolls forming a pinch line 32 therebetween. On its way from the first drafting mechanism 6 to the calendering process 17, the first pre-batt web 10 covers the travelling path a between the pair of output rollers 9 and the entrance of the nip line 32 into the calendering process 17. On its way from the second drafting mechanism 11 to the calendering process 17, the second pre-batt web 15 covers the travelling path B between the pair of output rollers 14 and the entrance of the nip line 32 into the calendering process 17. In a preferred embodiment, travel paths a and B have the same length.

The elements 33 are provided to guide the pre-batting webs 10 and 15 from the drafting mechanisms 6 and 11 to the clamping line 32 without interference. Element 33 is provided, for example, at the location of the combination of the first pre-fleece 10 and the second pre-fleece 15 and is shown as a guide applied to both sides of the pre-fleece 10 and 15. In the case of a compact arrangement of the drawing units 6 and 11 in accordance with the calendering process 17, the elements 33 for guiding the pre-fleece webs 10 and 15 can also be omitted.

The first drafting mechanism 6 and the second drafting mechanism 11 are arranged at a tilt angle relative to each other. The first drafting mechanism 6 is arranged at a positive inclination angle α with respect to the symmetry axis 34 and the second drafting mechanism 11 is arranged at a negative inclination angle β with respect to the symmetry axis 34. The symmetry axis 34 is understood to be a line which is located between the drafting mechanisms 6 and 11 and which is at the same distance from the respective pairs of drafting mechanism rollers 7 to 9 and 12 to 14 of the two drafting mechanisms 6 and 11 when the inclination angles a and β are the same. In the illustrated arrangement of the drafting mechanisms 6 and 11, the symmetry axis 34 corresponds to a horizontal line.

For example, the illustration shows a tape reel as a winding assembly. After the calendaring process 17, the batt web 18 is fed to a belt winder and wound onto a core 21 to form a batt roll 19 rotatably mounted about a fixed winding axis 20. The core 21 is driven by an endless belt 23, by means of which a loop 26 is formed between a deflection roller 24 and a tapping roller 25, in which the core 21 or the fleece roll 19 is received. In this example, the fleece 19 is driven counter-clockwise in the direction of rotation 22 by the belt 23. The loop 26 of the tape 23 wound around the batt roll 19 becomes larger as the size of the batt roll 19 increases, wherein the tape 23 is tensioned by the tensioning roller 29 throughout the winding process. The belt 23 is further guided by an ejecting roller 27 and a guiding roller 28.

Fig. 4 is a schematic view of a third embodiment of the device according to the invention. The device comprises a first drawing frame 6 and a second drawing frame 11, a calendering process 17 and a winding assembly. The fibre strip 5 is fed to the first drawing frame 6 and the further fibre strip 5 is fed to the second drawing frame 11. The first draft mechanism 6 has a pair of input rollers 7 and a pair of output rollers 9. The fibre strip 5 is subjected to deformation and converted into a first pre-batt web 10 by a first drafting mechanism 6 or drafting mechanism rollers 7 and 9 running at different speeds. The second drafting mechanism 11 has a pair of input rollers 12 and a pair of output rollers 14. The fibre strip 5 is subjected to deformation and converted into a second pre-batt web 15 by means of a second drafting mechanism 11 or drafting mechanism rollers 12 and 14 running at different speeds.

The first pre-fleece 10 and the second pre-fleece 15 are guided out of the drafting mechanisms 6 and 11 in the direction of travel 16 and are stacked on top of each other in the region of the elements 33 for guiding the pre-fleece 10 and 15 and are subsequently fed into the calendering process 17. Calendering process 17 forms batt web 18 from pre-batt webs 10 and 15. The calendering process 17 is represented by a pair of calender rolls forming a pinch line 32 therebetween. On its way from the first drafting mechanism 6 to the calendering process 17, the first pre-batt web 10 covers the travelling path a between the pair of output rollers 9 and the entrance of the nip line 32 into the calendering process 17. On its way from the second drafting mechanism 11 to the calendering process 17, the second pre-batt web 15 covers the travelling path B between the pair of output rollers 14 and the entrance of the nip line 32 into the calendering process 17. In a preferred embodiment, travel paths a and B have the same length.

The first drafting mechanism 6 and the second drafting mechanism 11 are arranged at a tilt angle relative to each other. The first drafting mechanism 6 is arranged at a positive inclination angle α with respect to the symmetry axis 34 and the second drafting mechanism 11 is arranged at a negative inclination angle β with respect to the symmetry axis 34. The symmetry axis 34 is understood to be a line which is located between the drafting mechanisms 6 and 11 and which is at the same distance from the respective pairs of drafting mechanism rollers 7 to 9 and 12 to 14 of the two drafting mechanisms 6 and 11 when the inclination angles α and β are the same. In the illustrated arrangement of the drafting mechanisms 6 and 11, the symmetry axis 34 is arranged obliquely with respect to the horizontal. The arrangement of the symmetry axis 34 is determined by the position of the entrance into the calendering process 17. In contrast to the arrangement in fig. 3, in which the pre-batt paths 10 and 15 are provided directly into the clamping circuit 32, the arrangement according to fig. 4 provides for the pre-batt webs 10 and 15 to indirectly enter the clamping circuit 32. The pre-batting webs 10 and 15 are introduced into the nip line 32 by the surface of one of the calender rolls. In the embodiment shown, the travel paths of the pre-fleece paths 10 and 11 between the respective pairs of output rollers 9 and 14 and the element 33 for guiding, or the travel paths of the combination of pre-fleece paths 10 and 15, are also of the same length.

For example, the illustration shows a roll winder as the winding assembly. After the calendering process 17, the web 18 is transferred to a first winding roll 35. From the first winding roller 35, the web 18 is transferred onto the core 21 and wound thereon. The winding process is supported by a second winding roller 36, whereby the two winding rollers 35 and 36 rotate in the same direction and drive the core 21 and the resulting roll 19 of batting in the direction of rotation 22, respectively. The core 21 rotates about the winding axis 20. The core 21 is held with the winding axis 20 in the housing 37, and the bearings of the winding axis 20 are displaceably arranged in the housing 37, so that the core 21 gets farther from the winding rollers 35 and 36 as the size of the batt roll 19 increases.

The invention is not limited to the embodiments as shown and described. Modifications are possible within the scope of the claims and combinations of features are also possible, even if these features are shown and described in different embodiments.

List of reference numerals

1. Container

2. Yarn rack

3. Creel roller

4. Fiber strip

5. Fiber strip

6. First drafting mechanism

7. A pair of input rollers

8. A pair of center rollers

9. A pair of output rollers

10. First pre-cotton web

11. Second drafting mechanism

12. A pair of input rollers

13. A pair of center rollers

14. A pair of output rollers

15. Second pre-batting web

16. Running direction of pre-cotton web

17. Calendering process

18. Cotton fibre web

19. Cotton roll

20. Winding axis

21. Core(s)

22. Direction of rotation of the batt roll

23. Belt with a belt body

24. Deflection roller

25. Open roll

26. Loop circuit

27. Ejecting roller

28. Guide roller

29. Tensioning roller

30. Rack

31. Foundation

32. Clamping circuit

33. Guide piece

34. Axis of symmetry

35. First winding roller

36. Second winding roller

37. Outer cover

A first Pre-batt travel path

B second Pre-batt travel path

Inclination angle of alpha first drafting mechanism

Inclination angle of beta second drafting mechanism

Claims (12)

1. An apparatus for manufacturing a batt roll (19) from a plurality of fibre strips (4), the apparatus having a frame (30), at least one drafting mechanism (6), a calendering process (17) and a winding assembly, wherein the at least one drafting mechanism (6) is designed to draw the fibre strips (4) and form a pre-batt web (10) and has a pair of input rollers (7) and a pair of output rollers (9), and wherein the calendering process (17) is arranged downstream of the at least one drafting mechanism (6) so as to form the batt web (18), characterized in that the at least one drafting mechanism (6) and the calendering process (17) and the winding assembly are held in the frame (30) and that a travel path (a) provided for the pre-batt web (10) between the pair of output rollers (9) of the at least one drafting mechanism (6) and an inlet into a clamping line (32) formed in the calendering process (17) is 200mm to 500mm.

2. The apparatus according to claim 1, characterized in that the drafting mechanism (6) has at least one pair of central rollers (8) between the pair of input rollers (7) and the pair of output rollers (9).

3. Device according to claim 1 or 2, characterized in that two drafting mechanisms (6, 11) are provided.

4. A device according to claim 3, characterized in that the drafting mechanisms (6, 11) are arranged obliquely in opposite directions.

5. An apparatus according to claim 3 or 4, characterized in that the travel path (B) provided for the second pre-wadded web (15) between a pair of output rolls (14) of the second drafting mechanism (11) and the inlet into the clamping line (32) formed in the calendering process (17) is 200mm to 500mm.

6. The device according to claim 5, characterized in that the travel path (a) provided for the first pre-wadding web (10) between the pair of output rollers (9) of the first drafting mechanism (6) and the inlet into the clamping line (32) formed in the calendering process (17) and the travel path (B) provided for the second pre-wadding web (15) between the pair of output rollers (14) of the second drafting mechanism (11) and the inlet into the clamping line (32) formed in the calendering process (17) are identical.

7. The device according to at least one of claims 3 to 6, characterized in that the drafting mechanisms (6, 11) are arranged one above the other and that the superposition of the pre-fleece webs (10, 15) formed by the drafting mechanisms (6, 11) is arranged upstream of the calendering process (17).

8. The apparatus according to at least one of the preceding claims, characterized in that the calendering process (17) is provided by a single pair of calender rolls, forming a clamping line (32).

9. The device according to at least one of the preceding claims, characterized in that a member (33) for guiding the pre-batting web (10, 15) is arranged upstream of the clamping line (32).

10. The device according to claim 9, characterized in that the distance between the respective pair of discharge rollers (9, 14) of the drafting mechanism (6, 11) and the element (33) for guiding the pre-wadding web (10, 15) is the same.

11. The device according to at least one of the preceding claims, characterized in that the winding assembly has a circumferential belt (23) for winding the fleece web (18) onto a core (21), wherein in the frame (30) at least five rollers (24, 25, 27, 28, 29) are rotatably mounted, about which the belt (23) rotates.

12. The device according to at least one of claims 1 to 10, characterized in that the winding assembly has a first winding roller (35) and a second winding roller (36) for winding the web (18) onto a core (21), wherein the winding rollers (35, 36) are rotatably mounted in the frame (30).