EP1285982B1 - Process and apparatus for producing a fibre web - Google Patents

Abstract

A single or multilayered non-woven web is longitudinally drawn by a drawing equipment (3) and buffered in a temporary storage (4) so as to adapt to speed fluctuations caused during drawing. The non-woven web is continuously discharged at a constant speed to generate a cross-lapped fleece web in the fleece laying machine (5). Independent claims are also included for the following: (1) device for manufacturing fiber fleece; and (2) drawing equipment.

Description

The invention relates to a method and an apparatus for producing a Nonwoven fabric having a pile producer and a nonwoven fabric layer formed from one of the pile fabricator continuously discharged single or multi-ply card web a nonwoven web with a generated over the laying width variable thickness.

Method and device of this type are known from DE 43 04 988 C1. They have to the goal, in the laid nonwoven web a transverse to the nonwoven web direction thickness profile to produce, which is lower in the edge areas than in the middle. The reason for that is that when solidifying the nonwoven web in a needle machine, the nonwoven web through the Needling process inserts laterally, i. becomes narrower, at the same time the thickness profile changed. From a needle machine fed nonwoven web of uniform thickness The needle machine produces a felt web which is thicker in its edge regions than in the middle is. To eliminate this unevenness, the needle machine is fed with a nonwoven web to, in their thickness from the center, starting in the direction of their edge areas accordingly gets thinner.

There are different methods, such as from a card made by a card may produce a nonwoven web which, viewed in cross section, has an uneven denier profile having. DE 40 10 174 A1 describes this purpose a nonwoven, in which by Decoupling the movement of the laying carriage against the Florzuführem a temporary Memory is formed, which has a variable pile storage at the outlet of the web laying on the Discharge tape allows. Within a cycle of movement of the nonwoven layer with pre-and Return of the laying carriage is always stored by the fleece layer just as much pile, as supplied at the same time by the pile generator ago. Within the lay cycle However, it is possible to let more or less Flor leak on the carriage. The mechanical and control technical effort of such a nonwoven layer is but considerably.

DE 43 04 988 C1 describes a method according to the preamble of claim 1, at by controlling the raising or lowering of the speed level uniformly the florführenden drives the fleece layer with respect to the delivery speed the pile producer of the pile is stretched or compressed. The pile runs with one of them constant speed running clutter over a constant speed running feed belt to the nonwoven, the Florentuecknahme speed depending is changed by the movements of the laying carriage. It comes to it cyclic train and cyclical compression of the incoming in the nonwoven layer card web with resulting thinning and thickening of the pile. However, only the temporal cycle of thickening and thinning in the pile with the movement rigidly coupled to the laying carriage. The local cycle or rapport of the thickenings and dilutions in the pile is not fixed in the same way because the bodies where thickening and dilution are produced by the type of device are not clearly defined. Tensile acts throughout the area of between the nonwoven layer and the clutter on the conveyor belt lying Flors and affects him in there especially from where thin sites already exist. So it is not guaranteed that the thin spots are laid by the leveler just where they are to be stored.

A similar procedure is described in US-A-5 590 442, according to which a nonwoven layer is operated with constant kinematics and by controlled emptying and filling a between a clutter and the nonwoven laying intermediate storage, in which the Flor is guided between adjacent bands, thin and thick spots in the card web be generated, which then moves through the nonwoven, the thin and thick places taking into account the transport speed at the desired locations the laying width of the nonwoven layer deposits. Again, the stretching takes place between the Cache and the nonwoven layer.

From FR 2 794 475 A1 a method is known in which, depending on the Cross-sectional profile of a laid nonwoven web or a felt made therefrom on the In front of the nonwoven laying arranged card is acted to a card web with distributed To create thin and thick places. A disadvantage of this procedure is; that on relative large moving masses must be acted, which is very powerful control and Drive equipment requires.

From US 5 590 442 an apparatus for producing a nonwoven fabric is known, comprising a card that makes a carded web, and a fleece layer. The fleece layer has one Set of bandages for receiving the card web and a movable laying carriage that transversely is movable above a drawstring and fed from the Legebändem card web zigzagging and overlapping on the drawstring. Because of the movement of the Legewagens is in the fleece layer also a so-called. Uppercarriage available, the changes compensated for the run length of the held by the ribbon tapes. Between the card and the fleece layer is arranged a pile store, which serves, Florüberschuß when the take-up speed of the nonwoven layer is less than the delivery speed of the card is to give off and Florüberschuss when the take-up speed of the battlegder greater than the delivery speed of the carding is.

From DE 22 59 919 A is an apparatus for warping confused, cross or longitudinal Nonwoven fabrics known consisting of pairs of rolls or Walzentrios, in which the distance between the pairs of rolls or Walzentrios smaller than the diameter the rollers is, whereby the clamping point of the pair of rollers to pair of rollers are made small can. The warping of random, cross or longitudinal fiber webs has the goal the stretching properties of a felt produced therefrom in the different stretching directions to match each other.

The invention is based on the object, a method of the type mentioned and specify a device suitable for the execution of the same, the storage of a Nonwoven web allow desired cross-sectional profile.

To solve this problem, the invention provides a method whose features in the claim 1 are included. Alternative embodiments of the same inventive concept spring, are objects of claims 2 and 3. Two devices to solve The object set are described in claims 11 and 12. Advantageous developments The invention are the subject of the respective dependent claims.

The invention thus provides, between the production of the pile and the transfer of the card web to the nonwoven a stretching operation at a defined point of the transport path of the Florbahn, so in practical execution in a separate drafting, which is not only the production of thick and thin places in the card web in predetermined

Rapport has, but it also allows both adjacent to the drafting system To run aggregates at constant speeds. In this case, the Velocity modulation, which generates the cyclic drafting system in the card web, by buffering means opposite the adjacent aggregates buffered.

If the intake side roller in the drafting system at a constant speed accordingly the constant discharge speed of the pile generator rotates and the cyclic stretching by cyclically accelerating and decelerating the rotational speed of the Outflow side roller of the drafting system is a buffer on the discharge side provided the drafting, which cyclically variable a portion of the card web Length absorbs. On the other hand, the outlet side roller of the drafting system with constant speed according to the constant pile take-up speed driven by the nonwoven layer and is the stretching process by cyclic braking and Re-accelerate the inlet side roller of the drafting executed, is a cache provided between the pile generator and the drafting system. A combination from both is also possible.

According to an alternative embodiment, it is also possible to use a buffer be dispensed with if the adjacent to the drafting units with The same speeds are driven, as their respective adjacent rolls of the drafting system. This then requires a corresponding modulation of the delivery rate the carding or take-up speed of the nonwoven layer.

According to a further variant of the invention is between the drafting system and the Fleece layer provided a temporary storage and works the nonwoven with one of the Legebewegungen his laying carriage dependent filing speed. The goal This measure will be briefly explained here.

The laying carriage of a fleece layer leads across the laying belt on which the nonwoven web travels generated by depositing the pile, running, reciprocating motion. The reversal of the movement at the end of the movement path, however, takes place not abrupt, but has forced braking and acceleration phases. If now the card web is fed at a constant speed, resulting due these deceleration and acceleration phases thickening in the deposited nonwoven web at exactly those places where the nonwoven web should actually be thinner. Therefore are known fleece layers constructed so that the laying carriage a variable Flortransportgeschwindigkeit has, which makes the use of a cache necessary to the uniform pile take-up speed of the feed belt of the nonwoven fabric nonuniform To match the pile transport speed of his laying trolley.

Now, if the pile take-up speed of the feed belt to the pile transport speed the laying carriage can be adapted to a buffer in the nonwoven be waived. The necessary temporary storage takes over according to this Embodiment of the invention existing between the drafting and the nonwoven Latch, which is for the compensation of the cyclically variable delivery speed the drafting system is necessary anyway. Works the cache with a moving storage roll or a reciprocating, continuously encircling Florspeicherband, whose or its movement drive in response to the Requirements of the fleece layer and those of the drafting system are controlled.

The drafting system can be multi-level, with a choice between each step each buffer may be arranged, which allow a relaxation of the pile fibers, which is advantageous in some applications.

It is also advantageous if the work result is measured and, based on this, a feedback control of the drafting system is performed. For this purpose, the Nonwoven web thickness detected transversely to the longitudinal extent of the nonwoven web, for example with the help radiometric, acoustic, optical or mechanical measuring devices, and the output signals These measuring devices are used to influence the extent of travel and Length of stretching zones used within the card web.

Fig. 1

eine Schemazeichnung einer ersten Ausführungsform einer Vorrichtung gemäß der Erfindung,

Fig. 2

eine Schemazeichnung ähnlich Fig. 1 mit einem modifizierten Streckwerk,

Fig. 3

eine Schemazeichnung ähnlich Fig. 2 mit einem modifizierten Streckwerk, und

Fig. 4

eine Schemazeichnung ähnlich Fig. 1 mit einer alternativen Ausführungsform eines Zwischenspeichers.

The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawings. It shows:

Fig. 1

a schematic drawing of a first embodiment of a device according to the invention,

Fig. 2

a schematic drawing similar to Figure 1 with a modified drafting system,

Fig. 3

a schematic drawing similar to Figure 2 with a modified drafting, and

Fig. 4

a schematic drawing similar to FIG. 1 with an alternative embodiment of a buffer.

The drawings show on the right side the tambour 1 of a card, from which two transfer belts 2a and 2b to a two disc rollers drafting system 3 extend, downstream of which the first intermediate band 10 of a pile memory 4 connects, which leads to the feed belt of a webbed 5. The drive devices (Engines) for carded roll, taker, deduction, drafting system, storage tank and Nonwoven layers are not shown here for reasons of clarity.

The use of two transfer bands 2a and 2b is justified that the card roll 1 two customers are assigned, namely an upper customer 6a with deduction 7a and a lower pickup 6b with deduction 7b. From the card will thus two Florbahnen delivered, which are relined before stretching. Customer and deduction are conventional and require no further explanation.

A special feature is the drafting system 3 for the supplied double-layered card web. The Drawframe 3 consists of a pair of disk rolls 8a and 8b, each consisting of a Variety of mutually parallel discs, the axes 9a and 9b of the disc rollers 8a and 8b have a distance from each other which is smaller than the sum of the Radii of the discs. The disks of the disk rollers 8a and 8b are each "gap" provided, i. the discs of a disc roller engage in the disc spaces the other disk roll in, so that the disk rolls 8a and 8b mutually penetrate. This measure makes it possible to make the draw zone short.

The mutual center distance of the disk rollers 8a and 8b is preferably adjustable, the length of the draw zone to the properties of the respective processed pile material, in particular the staple length of the pile fibers, adapt.

Part of the drafting system 3 are also the disk rollers 8a and 8b opposite Documents that in the example of FIG. 1 of the lower transfer conveyor 2b and the first intermediate band 10 of the storage tank 4 are formed. Both bands have a possible non-slip surface, so between the disk rollers 8a and 8b and the documents formed by the bands 10 and 2b have sufficient friction, in that due to a peripheral speed difference between the peripheral speeds the disk rolls 8a and 8b of the web between the disk rolls 8a and 8b can be longitudinally stretched.

As support for the card web in the area of the drafting rollers, there are also disk rolls and screen rolls and screen belts into consideration.

The use of disk rollers in the drafting system gives this particular advantages. On the one hand, the pile is compressed between the disk roll and the base. To It is necessary that the air contained in the Flor can escape from the pile. The intermediate trees between the discs of the disc rollers allow that largely unhindered escape of air from the card web. This escape can also be beneficial are when the lower transfer belt 2b and possibly also the intermediate belt 10 as Screen belts are formed. On the other hand, even with a relatively large disc diameter Achieve stretch zone lengths that are smaller than the wheel diameter.

Alternatively, screen rolls could be used instead of disk rolls, but Disk wheels are preferable because they have another advantage, namely the already mentioned that the distance between the nip lines, each from a disk roll and its counterpart is formed, as far as possible can be reduced. This distance between the nip lines determines the length the draw zone, which in turn depends on the fiber length in the pile and the fiber orientation should be chosen. Therefore, the distance between the axes of the two Disk rollers 8a and 8b also preferably adjustable.

If the draw zone is to be very short, rolls must be correspondingly small in diameter be selected so that the distance between the aforementioned clamping lines is small. In this case, it may be necessary for reasons of stability, the rollers at several To support their longitudinal extension at their side facing away from the drafting rollers.

If the pad is a screen belt, in the region of the associated draw roller to a guide roller is guided, it may be necessary, the guide roller on the draw roller To support the opposite side at several of its longitudinal extension to a bending to prevent.

Fig. 2 shows a construction in which each pad of a rotating screen belt 14th is formed, which runs over a support structure 15, which in the area of the associated Stretching roller 8a and 8b has a deflection small curvature radius'. These Support structure 15 is at least in the region of the draw roll opposite Support surface of several parallel juxtaposed ribs, the between form interspaces, or she has there a vented to the outside perforation on, in which when entering the gap between draw roller and pad from the Flor pushed out air can escape through the screen belt. As a result of the small one Curvature radii of the support structure 15 and the small diameter of the stretch rollers 8a, 8b results in a very short stretching zone, which is suitable for the processing of fibrous webs with short staple length of the fibers contained in the pile is suitable. It goes without saying that in front of and behind the documents corresponding supply and Abführbänder for Connect the felt web.

An alternative to this is shown in FIG. 3, according to which the pile conveyor belt 2 b and the intermediate belt 10 in the region of the drafting rollers shown here with a relatively small diameter 8b and 8a respectively over deflection edges 16 small radius of curvature ', comparable to Embodiment of FIG. 2, are performed. The support structure 15 for the deflection edges is similar to that of FIG. 2 constructed and preferably also has facilities for venting the card web on. Because of the necessary support of these deflection edges The bands mentioned must take a certain detour. In this solution are the separate screen belts of FIG. 2, which exclusively in the range of draw rolls circulate, dispensable, and it eliminates the additional spaces that the Must be bridged on their way in the field of drafting. The bands 2b and 10 are permeable to air, such as screen belts, to compress the card web to promote the escape of air from the card web. Both bands can be vacuumed be to assist the mechanical compression of the card web through a specially installable clamping device (not shown) and in any case inevitably caused by the drafting system.

Advantageously, the distance between the disk rolls 8a and 8b and theirs adjustable against documents to the heights of the column formed to adjust the thickness of the card web.

At the drafting a Florspeicher 4 connects, consisting of the already mentioned Intermediate belt 10, which leads out of the drafting system 3, a storage roller 11th and a second intermediate belt 12. The pile storage roller 11 is looped around by the card web. It gives the card web to the underside of the second intermediate belt 12, on which it is sucked by a negative pressure acting from above and thereby held. From the second intermediate belt 12, the card web passes to a feed belt 13 of the nonwoven webbing 5th

Within the pile store 4, the storage roll 11 is along the first intermediate belt 10 and the second intermediate belt 12 movable. The length of the way the Card web between the exit of the drafting system 3 and the entrance of the feed belt 13 must take, therefore, by the adjustment of the storage roller 11 along the intermediate ribbons 10 and 12 changeable. The variable caching of the stretched Card web is necessary to cycle in times in which the outgoing disk roll 8a of the drafting system 3 runs faster than in the other times to absorb the card web and to prevent them from being compressed in front of the feeding belt 13 of the nonwoven layer 5.

Alternatively, the pile storage 4 can be arranged on the intake side to the drafting system 3, namely then, when the stretching operation at a constant rotational speed of the drain side Disk roller 8a of the drafting system 3 by cyclically braking the disk roller 8b is performed and in this case a compression of the discharged from the carding drum 1 Florbahn before the drafting 3 must be prevented.

But it is also possible to completely dispense with a pile storage when the compression the card web by adjusting the speeds of the drafting adjacent Aggregates to those of the drafting system is prevented.

In operation of the embodiment of FIG. 1 of the device according to the invention passes through the two-ply card web delivered by the carding drum 1 the drafting system 3. When entering in the drafting system 3, the air contained in the card web is compressed by the compression the carded web is pushed out of this as far as possible, taking in the interstices between the discs of the drafting rollers and possibly through the pad escapes. From the drafting 3, the card web passes on the intermediate belt 10 of the pile memory 4, wraps around the Florspeicherwalze 11 and is to those in Fig. 1 right next to Storage roller 11 located portion of the lower run of the second intermediate band Sucked 12, which rotates counterclockwise at a constant speed. The upper run of the second intermediate belt 12 gives the card web to the feed belt 13 of the batt 5 from.

Depending on the movements of the laying carriage (not shown) of the nonwoven layer 5 controlled by a control device, not shown here, the drain side Stretching roller 8a of the drafting system and with it the first intermediate belt 10 cyclically on a higher peripheral speed than the constant peripheral speed of the upstream side Strechwalze 8b is, accelerates and then back to the original Braking peripheral speed. Simultaneously with this acceleration leads the Storage roller 11 moves to the left to the now increased speed, with which the card web is brought from the first intermediate belt 10, with the constant Circulation speed of the second intermediate belt 12 to reconcile, with In other words, to prevent a compression of the card web. If then then the Stretching roller 8a and with it the first intermediate belt 10 are braked again, moves the storage roller 11 again to the right to prevent stretching of the card web.

The tuning of the cyclic acceleration of the draw roll 8a and the first intermediate belt 10 with the laying motion of the fleece layer takes into account the length of the Running path of the card web between the drafting 3 and the delivery point of the batt and is set up in such a way that thin points generated by the drafting system in the card web in the Edge area of the nonwoven web produced from the card web are stored.

The speed with which the card web is received by the nonwoven layer 5 is constant, but larger than the constant speed according to the amount of stretch of the card web, with which the card web enters the drafting system 3.

If stretching of the pile as a whole should be desired, the circumferential ground speed the outlet-side draw roller, starting from the acceleration takes place to be set higher than the peripheral speed of the upstream side Stretching roll.

It should be emphasized at this point that arranged upstream of the drafting 3 a device which mechanically compresses the card web to those contained in it To push air out of her. This is especially indicated when the card web is very voluminous and therefore the venting effect in the drafting system may not be sufficient.

According to the drawings, the card web, which is fed to the drafting, consists of two layers that have been relined. Alternatively it is possible to only one of the layers through to pass the cyclically working drafting system, while the other position on this Draw frame is passed. However, it is then necessary to keep this other situation constant to stretch the mean extent with which the former position in the cyclic working drafting system is stretched, because the speeds of both layers must adapted to each other before the two layers are superimposed in front of the nonwoven layer become.

The embodiment of the device according to FIG. 4 differs from that according to FIG. 1 by the construction of the memory storage 4. Demanded the embodiment of FIG. 1 a second intermediate band 12, on which the card web is held by negative pressure effect, can dispense with such vacuum devices in the embodiment of Fig. 4 become. Instead, both intermediate bands 10 and 12 each have a vertically guided one Section on, and between these sections extends as a substitute for the Storage roller 11 of FIG. 1, an endless circulating storage belt 11 a, parallel to the vertical portions of the intermediate bands 10 and 12 can be adjusted to store in the store 4 different lengths of the cardstock store. This storage tape 11a holds the card web on both Zwischenbändem 10 and 12 in Appendix. The adjustment of the storage tape 11a obeys the rest of the same laws that for the storage roller in the embodiment of FIG. 1 apply. On a related matter Explanation can therefore be omitted to avoid repetition.

Claims (22)

1. A method of manufacturing a fiber fleece by means of a nonwoven producing means (1) and a fleece laying machine (5), which receives a single or multi layer nonwoven, web which is continuously discharged by the nonwoven producing means, with a constant speed and forms therefrom a fleece web having a thickness variable across the laying width, characterized in that the nonwoven web is longitudinally drawn in a separate drawing process (in 3) on its path between the nonwoven producing means (1) and the fleece laying machine cyclically in adaptation to the laying movements of the fleece laying machine (5), wherein upstram and/or downstream of the drawing process a buffering (in 4) of the nonwoven web takes place to obtain an adaptation of the fluctuations of the speed of the nonwoven web caused by the drawings process to the constant discharge and reception speeds of the nonwoven producing means (1) and the fleece laying machine (5), respectively.
2. A method of manufacturing a fiber fleece by means of a nonwoven producing means (1) and a fleece laying machine (5), which forms from a single or multi layer nonwoven continuously discharged by the nonwoven producing means a fleece web having a thickness variable across the laying width, characterized in that the nonwoven web is longitudinally drawn in a separate drawing process (in 3) on its path between the nonwoven producing means (1) and the fleece laying machine cyclically in adaptation to the laying movements of the fleece laying machine (5), within said fleece laying machine (5) the nonwoven web is advanced with variable speed in adaptation to the laying movement, without buffering within the fleece laying machine (5), and that after the drawing process and before the supply of the nonwoven web to the fleece laying machine (5) a buffering (in 4) of the nonwoven web takes place to obtain an adaptation of the fluctuations of the speed of the nonwoven caused by the cyclic drawing process to the transport speed of the nonwoven web within said fleece laying machine (5) and to obtain a compenmsation of the changes of the transport speed of the nonwoven web within said fleece laying machine (5).
3. A method of manufacturing a fiber fleece by means of a nonwoven producing means (1) and a fleece laying machine (5), which forms from a single or multi layer nonwoven continuously discharged by the nonwoven producing means a fleece web having a thickness variable across the laying width, characterized in that the nonwoven web is longitudinally drawn in a separate drawing process (in 3) on its path between the nonwoven producing means (1) and the fleece laying machine cyclically in adaptation to the laying movements of the fleece laying machine (5), and that the speed at which the fleece laying machine (5) receives the nonwoven web is synchronized with the speed at which the nonwoven web leaves the drawing process (in 3).
4. A method as claimed in claim 3, characterized in that the nonwoven web is accelerated by the drawing process (in 3) on a section arranged downstream of the drawing process.
5. A method as claimed in one of the preceding claims, characterized in that the nonwoven web is drawn in a plurality of successively arranged steps.
6. A method as claimed in one of the preceding claims, characterized in that the nonwoven web is compressed before the drawing process (3) in order to reduce its thickness.
7. A method as claimed in one of the preceding claims, characterized in that the length of the drawing zone (in 3) is adjusted depending on the staple length and the orientation of the fibers forming the nonwoven web.
8. A method as claimed in one of the preceding claims, characterized in that the surface weight of the fleece web is measured in individual sections transversely to the laying width, and the drawing process (in 3) is controlled depending on the results of the measurement.
9. A method as claimed in claim 8, characterized in that the surface weight is measured in radiometrically, optically, acoustically or mechanically.
10. A method as claimed in claim 9, characterized in that a measuring probe is moved back and forth in parallel to the laying direction of the fleece laying machine (5).
11. A device for manufacturing a fiber fleece from a nonwoven web, which is continuously discharged at a constant speed by a nonwoven producing means, and comprising a fleece laying machine (5) to which the nonwoven web is supplied, wherein the fleece laying machine is driven at a constant nonwoven transport speed, characterized in that a controllable drawing unit (3) is arranged between the nonwoven producing means (1) and the fleece laying machine (5) and through which the nonwoven web is passed, and which is adapted to draw the nonwoven web in a longitudinal direction, and that means are provided acting onto the drawing unit (3) in the sense of a change of the drawing effect exerted onto the nonwoven web depending on the laying movements of the fleece laying machine (5), and that buffer storage means (4) are provided, which are arranged between the drawing unit (3) on one hand and the fleece laying machine (5) or the nonwoven producing means (1) on the other hand, or between the drawing unit (3) on one hand and the nonwoven producing means (1) on the other hand.
12. A device for manufacturing a fiber fleece from a nonwoven web, which is continuously discharged at a constant speed by a nonwoven producing means (1), and a fleece laying machine (5) to which the nonwoven web is supplied, Characterized in that a controllable drawing unit (3) is arranged between the nonwoven producing means (1) and the fleece laying machine (5) through which the nonwoven web is passed and which is adapted to draw the nonwoven web in the longitudinal direction, that means are provided which act on the drawing unit (3) in a sense of acyclic change of a drawing effect exerted onto the nonwoven web depending on the laying movements of the fleece laying machine (5), and that means are provided which synchronize the speed at which the fleece laying machine (5) takes in the nonwoven with the speed at which the drawing equipment outputs the nonwoven web.
13. A device as claimed in claim 11 or 12, characterized in that the drawing unit (3) comprises a plurality of drawing zones.
14. A device as claimed in claim 13, characterized in that a buffer storage for a section of the nonwoven web is arranged between the individual drawing zones.
15. A device as claimed in one of claims 11 to 14, characterized in that means for measuring the surface weight of the fleece web in individual sections of the fleece web distributed transversely to a longitudinal extension of the fleece web are arranged above the fleece laid by the fleece laying machine (5).
16. A device as claimed in claim 16, characterized in that the measuring means are radiometric, acoustic, optical or mechanical measuring means.
17. A device as claimed in claim 16, characterized in that a measuring probe is provided which is movable on guide paths extending in parallel to the laying direction of the fleece laying machine (5).
18. A device as claimed in one of claims 11 to 17, characterized in that a clamping means for compressing the nonwoven web is arranged between the nonwoven producing means (1) and the drawing unit (3).
19. A drawing unit for a nonwoven web in an apparatus of any one of claims 11 to 18, characterized in that it comprises at least two disk rollers (8a, 8b) arranged in parallel to each other, the mutual distance of said rollers being adapted such that the disks of the one roller (8a) project into the gaps between the disks of the other roller (8b), wherein a support (2b, 10) confronts said disk rollers (8a, 8b), said support being selected from a group that comprises a rubber belt, a perforated belt, a perforated roller, and a disk roller, and that the disk rollers (8a, 8b) have circumferential speeds that cyclically have a difference in the nonwoven passing direction.
20. The drawing unit as claimed in claim 19 in a device as claimed in one of claims 11 to 18, characterized in that a control means is provided, which is adapted to cyclically change the difference of the circumferential speeds of the disk rollers (8a, 8b) in adaptation with the laying movement of the fleece laying machine (5).
21. The drawing unit as claimed in claim 19 or 20, characterized in that the distance between two neighboring, engaging disk rollers (8a, 8b) is adjustable.
22. The drawing unit as claimed in one of claims 20 and 21, characterized in that the distance between each disk roller (8a, 8b) and the support (2, 10) confronting same is adjustable.

Images