FR2832737A1 - Card used in textile field for producing nonwoven web comprises accumulator transfer cylinder between carding drum and first cylinder - Google Patents

Abstract

A card (3) comprises a carding drum (3h), carding members (3e, 3f) mounted at the periphery of the carding drum, and card outlet(s) having first cylinder (3d) for forming a nonwoven web. The card includes an accumulator transfer cylinder (3i) between the carding drum and the first cylinder for forming a nonwoven web (W1, W2).

Description

CARD HAVING AN ACCUMULATING TRANSFER CYLINDER

  AND METHOD FOR PRODUCING A NONWOVEN

  The present invention relates to the textile field, and more particularly the field of the production of nonwovens by means of a card. Its main objects are a new card, the output of which has been perfected, as well as a new process for producing a carded nonwoven. The invention preferably, but not exclusively, finds its application in the production at high speed 0 (typically production speeds greater than or equal to 150 m / min), of carded nonwovens composed of fibers of the type

  Polypropylene, Polyethylene, cotton, viscose, etc ...

  A card for the production of a nonwoven comprises in an essential manner the to me ns a rotary carding drum, still commonly called main drum or large drum, at the periphery of which are mounted carding members. In operation, the fibers transported at the periphery of the carding drum are individualized (fiber carding operation) by the combined actions of the carding members and of the peripheral lining of the carding drum. Generally, and by way of nonlimiting example, these carding members are composed by one or more successive carding groups, each carding group being composed of a roller commonly called "worker" associated with a roller "deLourreur", still called "sweeper". In another embodiment, these carding members may be fixed and be in the form of a fixed fairing (also commonly called "carding plate") comprising a plurality

  carding points fixed at the periphery of the carding drum.

  Usually in a conventional carding structure, during operation, each rotation of the carding drum, a more or less small portion of the fibers at the periphery of the carding drum is taken up, at a point located downstream of the carding members. , while the residual part of the fibers at the periphery of the carding drum is recycled by this carding drum to the carding members. The recovery of the fibers at the periphery of the carding drum is ensured by one or more successive cylinders, which form a carding outlet, and which generally work the fibers and have the function of forming on their periphery a non-woven web. woven from these fibers. In the remainder of this text, these cylinders will be generally designated by "cylinders forming a non-veil

0 woven>.

  Several card outlet configurations using a plurality of successive cylinders for forming a nonwoven web are known to date. As non-exhaustive examples are given below

  after the four most common card outlet configurations.

  A first known carding outlet configuration, allowing the production of a parallel nonwoven, employs one or more, as cylinders for forming the nonwoven web.

successive combing cylinders.

  A second known carding outlet configuration, allowing the production of a scrambled nonwoven, implements, by way of cylinders for forming the nonwoven web, a cylinder commonly known as "counter drum" followed by a combing cylinder. A third known carding outlet configuration, allowing the production of a condensed nonwoven, implements, by way of cylinders for forming the nonwoven web, a combing cylinder, followed by at least one condensing cylinder; most of the time the comb cylinder is followed by two successive condenser cylinders. A fourth known carding outlet configuration employs, as cylinders for forming the nonwoven web, a counter-drum cylinder followed by a combing cylinder and a condensing cylinder. In the aforementioned conventional carding configurations, the carding drum plays a role both in the function of individualization of the fibers (carding of the fibers by the carding members in cooperation with the carding drum), and in the formation of the veil not -woven at the outlet of the card by the web forming cylinders, from individualized fibers transported around the periphery of the carding drum. As a result, the speed of rotation of the carding drum 0 is an adjustment parameter which predominantly conditions both the quality of carding of the fibers at the periphery of the carding drum by the carding members, and the properties

  mechanics of the nonwoven produced (isotropy, grammage, ...).

  The adjustment of this speed of rotation of the carding drum must therefore be carried out so as to comply with two distinct constraints (quality of carding on the one hand and obtaining the mechanical properties required for the nonwoven produced on the other hand), requiring

  thus the designer of the card to choose a compromise in this adjustment.

  In practice, obtaining the required carding quality of the fibers means that the speed of rotation of the carding drum has to be adjusted within a relatively narrow speed range, and from this speed adjustment of the carding drum, the designer of the carded deduces the speed settings of the sail forming cylinders, so as to obtain a nonwoven having the mechanical properties

required (grammage, isotropy, ...).

  Since the speed adjustment range of the carding drum is narrow compared to the fiber carding function which must be ensured by this drum, the designer of the carding machine is in practice restricted in his choice for the rotation speeds of the 3 o cylinders for forming the non-woven veil, and thereby regulating the production speed of the non-woven fabric leaving the card. In addition, it is difficult to increase the speed of production of the nonwoven fabric coming out of the card, without damaging the

mechanical properties of the web.

  The present invention aims to provide a new card structure which pal li the above drawback, in that it offers greater flexibility in the speed control of the nonwoven forming cylinders. Another object of the invention is to be able to increase the speed of production of the card, without damaging the

  mechanical properties of the nonwoven produced.

  0 The card of the invention is known in that it comprises a carding drum, carding members mounted on the periphery of the carding drum and at least one card outlet comprising at

  minus a first cylinder for forming a nonwoven veil.

  According to a first characteristic of the invention, the card comprises a transTert accumulator cylinder between the drum

  carding and the first cylinder for forming a nonwoven web.

  The function of the transTert accumulator cylinder of the carding machine of the invention is to simply take up the fibers transported at the periphery of the carding drum without working them during their transfer from the carding drum, and to supply the first cylinder with fibers. formation of haze, by forming an accumulator buffer between the carding drum and the first haze-forming cylinder, due to the recycling of the fibers at the periphery of the

transfer cylinder.

  The fiber recovery function which must be provided by the accumulator transfer cylinder is not very restrictive in terms of adjusting the speed of rotation of this cylinder, and can advantageously be obtained by adjusting the speed of rotation of the accumulator transTert cylinder within a range of speeds. very large; In practice, it will suffice that the speed of rotation of the transfer cylinder is adjusted so that its circumferential speed is greater than the circumferential speed of the carding drum. It thus becomes easy to regulate the speed of rotation of this transfer cylinder within this very wide range, so as to optimally regulate the supply of fibers to the first non-woven fly forming cylinder, and so that this speed is adapted to the desired production characteristics (production speed, mechanical properties required for the nonwoven product (grammage, isotropy, etc.). Thus, compared to the abovementioned traditional solutions, this accumulator transfer cylinder advantageously allows 0 to obtain better decoupling on the one hand between the carding function (individualization of the fibers by carding between the carding drum and the carding members of the card) and the function of forming the nonwoven web provided by the successive cylinder or cylinders downstream of the

accumulator transfer cylinder.

  Another subject of the present invention is also a method

  for producing a nonwoven using a card of the invention.

  According to this method, at each rotation of the carding carding drum, more than 90%, and preferably 100% of the fibers transported to the periphery are taken up by means of the accumulator transfer cylinder.

carding drum.

  Other characteristics and advantages of the invention

  will appear more clearly on reading the description below of a

  preferred example of embodiment of a card of the invention, which

  description is given by way of nonlimiting example and in reference

  in the appended drawings in which: - Figure 1 schematically shows a production line for a nonwoven using a card of the invention with double outlet, - Figures 2 and 3 are detailed views of an example of teeth of the accumulator transfer cylinder lining of the card in FIG. 1, and FIG. 4 is an enlarged view of the transfer zone between the carding drum and the transTert cylinder

  accumulator of the card of figure 1.

  The production line shown in Figure 1 allows the parallel production of two nonwoven webs W1 and W2, which are deposited and transported on two conveyor belts B. At a later stage of production, these two nonwoven W1 and W2 are either consolidated separately by any known consolidation means, or are for example superimposed so as to form a nonwoven more

  thick, which is subsequently consolidated.

  This production line of FIG. 1 comprises a traditional loader-weigher 1 which feeds, via

  a conveyor 2, a card 3 with double outlet.

  Card 3 includes a traditional card entry, consisting of a trough 3a, a food roller 3b and a breaker cylinder 3c. The breaker cylinder 3c feeds a first rotary 3d carding cylinder, which is commonly called the front end, and the surface of which is usually coated with a card lining or any other equivalent means enabling it to take up the fibers.

  from the periphery of the breaker cylinder 3c. Usually, the

  train 3d is also provided on its periphery with several carding members, which make it possible to work the fibers taken from the lining of the card of this 3d cylinder, so as to individualize them. In the particular example illustrated, these carding members consist of several successive pairs of a sweeping roller 3e and a working roller 3f. Downstream of these carding members, the fibers are taken from the periphery of the first carding cylinder 3d, and transferred in the state to a second carding cylinder 3 h rotary, by a cylinder of

  transTert 3g, also commonly known as "communicator".

  The second 3h carding cylinder, also commonly known as the "big drum" or "main drum" will be designated below.

  of the present description by the terms "carding drum". This

  carding drum 3h is usually coated on its periphery with a card lining allowing it to take up the fibers at the periphery of the communicator 3g. Also, this 3h carding drum is equipped on its periphery with carding members (3e, 3f) identical to

  those fitted to the first 3d carding cylinder.

  The invention is not limited to a card having the particular configuration of card 3 with two carding cylinders of FIG. 1. In particular, depending on the type of fibers to be opened, and the desired degree of opening 0 of these fibers, it is conceivable to use a longer card implementing at least three successive carding cylinders, or on the contrary a shorter card implementing a single carding cylinder. Furthermore, the rollers 3e and 3f could be arranged by being juxtaposed one behind the other in an alternating manner, according to a configuration commonly called "Garnett". The sweeping and worker rollers (3e, 3f) at <, at the periphery of each carding cylinder could also be replaced by any means of different structure, but fulfilling the same function, that is to say having the function, in combination with the carding cylinder, of individualizing the fibers on the periphery of the cylinder In particular, these rollers could be replaced by static plates, commonly called "carding plates" mounted at the periphery of the carding cylinder and comprising a plurality of fixed carding points in the form of

example of grooves or grooves.

  The card 3 of FIG. 1 has two respectively upper and lower ends, each outlet comprising in the usual way the webs for forming webs 3j, 3k. In the preferred embodiment illustrated, the first sail forming cylinder 3j is a combing cylinder; the second sail forming cylinder 3k is a condensing cylinder. These two cylinders usually make it possible to form a condensed nonwoven web, from the fibers which are conveyed to the periphery of the comb cylinder 3j. Each nonwoven (W1, W2) is detached from the periphery of the condensing cylinder 3k by a detaching device, in accordance with the device described in European patent application EP-A-0 704 561. This detaching device essentially comprises a detaching cylinder 31, which makes it possible to detach the fiber from the periphery of the condensing cylinder 3k and to deposit it on the conveyor belt B. This conveyor belt is permeable to air, and a suction box S is provided at the level of the spotting area, so as to press the nonwoven by suction onto the surface of the conveyor belt B. In FIG. 1, the element

  additional 3m is a rotating brush.

  In a conventional carding configuration, the first nonwoven web forming cylinder, such as the combing cylinder 3j, is mounted directly on the periphery of the carding drum 3h. This arrangement makes it difficult and restrictive to regulate the cylinder speed of the 3h carding drum and the sail-forming cylinders. In fact, the speed of rotation of the carding drum 3h must be adjusted so as to allow both efficient carding with carding members 3e and 3f, and to allow efficient combing of the fibers during their transfer between the cylinder 3h and ie first cylinder

sail training 3d.

  Also, when the combing cylinder 3j is juxtaposed with the carding drum 3h, in order to use a detaching device of the type of that of FIG. 1 with detaching cylinder 31 and conveyor belt B. we have hitherto been forced in practice to use successively two 3k condenser cylinders instead of a single cylinder in the configuration of the invention. However, the implementation of two successive condenser rolls has the drawback of causing a rolling of the nonwoven between the two condensing rolls, this rolling being detrimental

  source of bubble phenomena and fouling of condensers.

  With reference to FIG. 1, in accordance with the invention, the first sail-forming cylinder 3j is no longer disposed at the periphery of the carding drum 3h, but the card 3 comprises an accumulator transfer cylinder 3i between the drum of carding 3h and each first training cylinder 3d of a non-woven veil. In the illustrated embodiment, this accumulator transfer cylinder 3i is adjacent to each first sail forming cylinder 3j of

each of the two outputs.

  0 This accumulator transfer cylinder 3i generally has the function of taking up the fibers at the periphery of the carding drum 3h, and of transferring them as they are, without subjecting them to any particular work, in contrast for example with the reorientation of the fibers which is carried out by a veil forming cylinder such as a comb cylinder 3j or a condenser cylinder 3k. This transfer cylinder 3i therefore plays, on the one hand, the role of a simple communicator with respect to the carding drum 3h, and on the other hand fulfills a function of distributing the fibers and regulating the feed rate of these

  fibers vis-à-vis each first veil forming cylinder 3j.

  In order to perform these functions, the accumulator transfer cylinder 3i is equipped on its periphery with a metal lining G. an exemplary embodiment of which is illustrated in FIGS. 2 and 3. This lining G is composed of a plurality of teeth 4 In FIG. 2, the double arrow L represents the direction parallel to the longitudinal axis 25 of the accumulator transfer cylinder 3i, that is to say the direction orthogonal to the plane of FIG. 1. FIG. sectional view of the lining of the accumulator transfer cylinder 3i along a plane transverse to the longitudinal axis of the accumulator transfer cylinder 3i. Referring to Figure 2, the teeth 4 of the lining G are 3 o aligned in the form of adjacent rows parallel to the longitudinal axis of the cylinder transTert accumulator 3i; in Figure 2, only two adjacent rows of teeth 4 have been shown. With reference to FIG. 3, each tooth 4 of the lining G is inclined relative to the radius of the accumulator transfer cylinder 3i at an angle A and is oriented in the direction of rotation of said cylinder (circumferential speed V2). In Figure 4, the teeth 4 of the lining G of the transfer cylinder have been shown very schematically so as to mainly show their inclination and their orientation above. Also with reference to this FIG. 4, the carding drum 3h is in a known manner equipped with a carding lining G 'which is usual, and whose teeth 4' are inclined relative to the radius of the carding drum 3h, and are oriented in the direction of

rotation of the carding drum 3h.

  With reference to FIGS. 1 and 4, when the card 3 is operating, the accumulator transfer cylinder 3i is driven in a direction of rotation which is opposite to the direction of rotation of the carding drum 3 h. More particularly, the speed of rotation of the accumulator transfer drum 3i is adjusted so that its circumferential speed V2 (FIG. 4) is greater than the circumferential speed V1 of the carding drum 3h. In operation of the card, the fibers which are transported to the periphery of the carding drum 3h, after having been identified by the action of the carding members 3e, 3f, are taken up in the lining G of the accumulator transfer drum 3i. During its transfer between the carding drum 3h and the accumulator transfer cylinder 3i, each fiber is taken up by the teeth 4 of the lining G of the transfer cylinder 3i, without being retained by the teeth 4 'of the lining G' of the drum of carding 3h. As a result, the fibers are transferred as they are, without being worked, contrary to what occurs in a conventional carding structure, when the fibers are taken from the periphery of the carding drum by a web forming cylinder of the cylinder type

  comber or counter-drum cylinder.

  According to another characteristic of the invention, with each rotation of the transfer drum 3h, it is sought to cause the accumulator transfer drum 3i to take up the maximum of fibers (at least 90/0) transported by the carding drum, and preferably 100 % of these fibers. To this end, the circumferential speed V2 of the transTert accumulator cylinder 3i is judiciously adjusted with respect to the circumferential speed V1 of the carding drum 3h. For this purpose, in practice, it is preferable that the speed ratio (V2N1) be

  greater than or equal to 1.2, and preferably greater than or equal to 1.3.

  Thus, and contrary to what was traditionally sought in a conventional card, there is no more recycling of fibers

  at the periphery of the 3h carding drum, all or almost all

  all fibers after carding being taken up by the transTert accumulator drum 3i. Up to this day, there was a prejudice to consider that it was preferable, if not essential, that recycling of the fibers at the periphery of the 3h carding drum take place. Until now, it was assumed that this recycling allowed a fiber to be advantageously carded several times. However, the Applicant was able to note first of all that in practice in a traditional carding machine, the fibers which are trapped in the lining of the carding drum are recycled, and the fibers located on the outer periphery of this lining tend mostly to be taken up directly by the sail forming cylinders, after a first and only passage between the carding members. This phenomenon is all the more preponderant as the working speed of the card is important. In other words, after the lining of the carding drum 3h is filled with fibers, the new fibers introduced at the entry of the carding drum are not recycled by this drum and leave the carding drum directly after a single and single passage between the carding organs. Consequently, the applicant has been able to demonstrate that this recycling is not in practice. necessalre. On the other hand, in the card of the invention, the absence of recycling of the fibers at the periphery of the 3h carding drum, advantageously makes it possible to avoid filling the card lining of the 3h carding drum. Thus, the new fibers which are presented at the entry of the carding drum 3h by the communicating cylinder 3g, are taken up by an empty lining, instead of a lining 0 filled in the traditional solution. The teeth of the carding lining of the drum 3h thus make it possible to obtain a better carding effect in cooperation with the peripheral carding members 3f, 3e, and thereby better carding of the fibers transported to the

periphery of the drum 3h.

  According to another advantage of the invention, the speed of rotation of the carding drum 3h can be adjusted so that it is independent from the speeds of rotation of the web forming cylinders 3j, 3k. In the context of the invention, the speed of rotation of the carding drum 3h is adjusted by only being concerned with the quality of carding of the fibers between this drum and the carding members 3f, 3e. Once the speed of rotation of the carding drum 3h has been carried out, the speed of rotation of the accumulator transfer drum 3i is adjusted, so as to meet the aforementioned speed criterion, which is not very restrictive (circumferential speed V2 of the accumulator transfer cylinder 3i greater than the circumferential speed V1 of the carding drum 3h). The respective rotational speeds of the web forming cylinders 3j and 3k will be adjusted so as to obtain the desired work for the fibers. In practice, the speed of rotation of the combing cylinder 3j will be adjusted so that its circumferential speed is less than the circumferential speed of the accumulator transfer drum 3i. Preferably, the circumferential speed of the combing cylinder 3j is less than or equal to 25% of the circumferential speed of the accumulator transTert drum 3i. The speed of rotation of the condenser cylinder 3k will be chosen such that its circumferential speed is less than about 80% of the circumferential speed of the combing cylinder 3j. In operation, the fibers which are taken up at the periphery of the accumulator transfer drum 3i are transported by this drum to the two combing cylinders 3j. Each combing cylinder 3j takes a part of these fibers, the other part being recycled to the periphery of the accumulator transfer drum 3i. In order to avoid a flight of these fibers transported to the periphery of the transTert accumulator cylinder 3i, this cylinder is preferably fitted on its

  periphery of fairings C1, C2 and C3 (Figure 1).

  According to an additional characteristic of the invention, the card 3 comprises one or more carding members, which are mounted on the periphery of the accumulator transfer cylinder 3i. For example, with reference to Figure 1, the fairing C1 is replaced by one or more carding plates, which in operation of the card allow the fibers transported to the periphery of the accumulator transfer cylinder 3i to be worked. An additional disentangling of these fibers is thus obtained, which advantageously makes it possible to obtain a better quality nonwoven, and in particular a more regular nonwoven, at the output of the card. In another variant, the carding plates could be replaced by any carding member performing the same function, and for example by one or more pairs of worker and sweeper rollers. Preferably, these additional carding members are positioned in a region located upstream of the fiber transfer zone (in the case of a single output card) or upstream of the fiber transfer zones (in the case of a card with several outlets) between the accumulator transfer cylinder

  3i and each first cylinder 3j for forming a nonwoven web.

  In the particular example of FIG. 1, this preferential region for positioning the carding members corresponds to the zone of the periphery of the accumulator transfer drum 3i which is occupied by the fairing C1, and which extends between the carding drum 3h and the lower 3j combing cylinder. With reference to FIG. 1, it appears that the diameter d of the transfer drum 3i is less than the diameter D of the carding drum 3h. It advantageously follows that in the card of the invention, the fibers which are recycled to the periphery of the drum 0 transfer accumulator 3i are presented more frequently to the two combing cylinders 3j. Thus, if there is a periodic defect on the drum of Accumulator transTert, this higher frequency of recycling of the fibers, makes it possible to generate in the nonwoven product

  periodic defects which are more difficult to perceive.

  According to another advantage of the invention, in the preferred configuration illustrated in FIG. 1, each comber 3j advantageously collects the fibers from above, which allows gravity to act in the right direction on the combers. In addition, it is advantageously possible to use only a single condensing cylinder 3k after the combing cylinder 3j, the nonwoven formed at the periphery of the condensing cylinder presenting itself correctly so that it can be detached by the detaching cylinder 31 and be deposited on the conveyor belt B. In the light of the description which has just been made of card 3,

  it is understood that the transfer drum 3i of the invention advantageously allows better decoupling between on the one hand the carding function of the card, and on the other hand the function of forming a nonwoven, and thereby better independence in adjusting the speeds of the elements ensuring these two functions. The speed of rotation of the carding drum 3h will be adjusted so as to optimize the carding operation of the fibers by the carding members 3e, 3f; the speed of rotation of the accumulator transfer cylinder 3i will be adjusted so as to regulate the fiber feed rate at the inlet of each first sail-forming cylinder, and also to obtain the desired production speed for the sail at the output of the card, while being set at a speed sufficient for this accumulator transfer cylinder to be able to take up the fibers at the periphery of the carding drum; the speed of rotation of the sail-forming cylinders will be adjusted so as to optimize the work carried out on the fibers by these cylinders, and thereby optimize the

  0 quality of the nonwoven produced (isotropy, weight, etc.).

  In a specific embodiment given purely by way of indication, card 3 was used to manufacture in parallel two condensed nonwovens W1 and W2 from polypropylene fibers, of length approximately 40 mm, and of titration being worth approximately 2, 2 diex. The diameter D of the carding drum 3h was worth 1500 mm; the diameter d of the accumulator transfer drum 3i was 700 mm; the speed of rotation of the carding drum 3h was worth approximately 212 Vmn, which corresponded to a circumferential speed V1 of approximately 1000 m / min; the rotation speed of the accumulator transfer drum 3i was approximately 590 rpm, which corresponded to a circumferential speed V2 of approximately 1300 rpm; the speed of rotation of each comb cylinder 3j was approximately 91 Vmin, which corresponded to a circumferential speed of approximately 200 m / min; the speed of rotation of each condensing cylinder 3k was worth 162 timin, which corresponded to a circumferential speed of approximately 150 m / min. With reference to FIGS. 2 and 3, the angle (A) of the teeth 4 of the lining G of the accumulator transfer cylinder 3i was worth approximately 30; the height (H) of each tooth 4 was 3.1 mm; the pitch (p) between two rows of teeth 4 was 1.6mm; the distance (e) between two adjacent teeth 4 of the same

3 0 row was 3.3mm.

  The invention is not limited to a double output card, but can of course be applied to cards having a single output, or to cards having more than two outputs. Also, the invention is not limited to an outlet, the webs of which consist of a comb cylinder followed by a condenser cylinder, but can be implemented with any known type of web cylinder. In particular, we can

  make a card with one or more non-veil forming cylinders

  woven are only combing cylinders. Also, it is possible to envisage making a card, the first formation cylinder of which the sail is not a combing cylinder but, for example, a counter-drum cylinder. More particularly, it is possible, for example, to produce a card according to the invention, an output of which is constituted by a counter-drum cylinder followed by a combing cylinder, or even a card, an output of which is formed by a counter-drum cylinder, followed a combing cylinder and a condensing cylinder, in both cases, the counter-drum cylinder being adjacent to the transfer drum

accumulator 3i of the invention.

Claims (12)

  1. Card comprising a carding drum (3h), carding members (3e, 3f) mounted on the periphery of the carding drum, and at least one card outlet comprising at least a first cylinder (3j) for forming a non-woven web (W1), characterized in that it comprises a transTert 0 accumulator cylinder (3i) between the carding drum (3h) and the   first cylinder (3d) for forming a non-woven veil.   2. Card according to claim 1 characterized in that the accumulator transfer cylinder (3i) comprises, to ensure the recovery of the fibers at the periphery of the carding drum (3h), a lining (G) comprising a plurality of teeth inclined relative to to the radius of the accumulator transfer cylinder (3i) and oriented in the direction of rotation of said cylinder, and in that in operation of the card, the accumulator transfer cylinder (3i) is driven in a direction of rotation opposite to the direction of 2 o rotation of the carding drum and with a circumferential speed (V2) greater than the circumferential speed (V1) of the carding drum (3h).   3. Card according to claim 2 characterized in that the circumferential speeds (V1) of the carding drum (3h) and (V2) of the accumulator transfer cylinder (3i) are adjusted so that the speed ratio (V2N1) is greater or equal to 1.2,   and preferably greater than or equal to 1.3.   4. Card according to one of claims 1 to 4 characterized in that   the accumulator transfer cylinder (3i) has a lining (G), and the speed of rotation of the accumulator transfer cylinder (3i) is regulated in such a way that in operation of the card, the accumulator transfer cylinder (3i) resumes, at each rotation of the carding drum (3h), more than 90%, and preferably 100%, of the fibers transported to the periphery of the carding drum (3h).   5. Card according to one of claims 1 to 4 characterized in that   the diameter (d) of the accumulator transfer cylinder (3i) is   less than the diameter (D) of the carding drum (3h).   6. Card according to one of claims 1 to 6 characterized in that   that it has two outlets each comprising a first 0 sail-forming cylinder (3d) adjacent to the same cylinder accumulator transfer (3i).   7. Card according to one of claims 1 to 7 characterized in that   the first cylinder (3j) for forming a nonwoven web is a paint cylinder.   8. Card according to claim 8 characterized in that the cylinder   comber (3d) is followed by a single condenser cylinder (3k). = -   9. Card according to one of claims 1 to 8 characterized in that   that the first cylinder (3j) for forming a nonwoven web is a counter-drum cylinder.   10. Card according to one of claims 1 to 9 characterized in that   that it comprises one or more carding members (C1) which are mounted on the periphery of the accumulator transTert cylinder (3i), and which preferably are positioned in a region situated upstream of the zone or zones of transfer between the transfer cylinder accumulator (3i) and each first cylinder (3j) of formation of a non-woven veil.   11. Process for producing a nonwoven using a card   referred to in any one of claims 1 to 10.   12. The method of claim 11 characterized in that at each rotation of the carding drum (3h), is taken up by means of the accumulator transfer cylinder (3i) more than 90%, and preferably 100% of the fibers transported to the periphery of