EP1589132A1 - Carding machine with a rotating suction transfer device - Google Patents

Abstract

The carding machine for making at least one fibre web (V1, V2) consists of a carding drum (1), doffing cylinders (2), condensing rollers (3), lifting cylinders (4) and transporting surfaces (6), with the lifting cylinders rotating at a speed of at least 130 m/min, and preferably 150 m/min or more. Between each lifting cylinder and transporting surface there is a rotary suction transfer roller (5) designed to transfer the fibre web between the two while holding it in place by suction. In a variant of the design each of the cylindrical transfer rollers can be replaced by a belt.

Description

TECHNICAL AREA

The present invention relates to the production of nonwovens by means of a card of the type comprising at least one detaching cylinder ensuring the recovery of a fiber web at the exit of the card with a point of turn back up. Her main objects are a new card whose output has been perfected so as to improve the quality of the veil of fibers produced. The invention preferably, but not exclusively, its application to high-speed production of nonwovens composed of synthetic fibers of the polypropylene, polyethylene, ... fiber type natural cotton type, ..., or viscose-type artificial fibers, ...

PRIOR ART

• au moins un tambour de cardage rotatif, encore communément désigné « tambour principal » ou « grand tambour », à la périphérie duquel sont montés des organes cardants,
• et un ou plusieurs cylindres successifs (notamment cylindre contre-tambour et/ou cylindre(s) peigneur(s) et/ou cylindre(s) condenseur(s)), qui d'une manière générale ont pour fonction de former sur leur périphérie un voile de fibres non-tissé à partir des fibres délivrées par le tambour de cardage ; dans la suite du présent texte, ces cylindres seront désignés généralement par « cylindres de formation d'un voile de fibres».

A card for the production of a nonwoven comprises in the usual manner:

• at least one rotary carding drum, still commonly referred to as a "main drum" or "large drum", on the periphery of which carding members are mounted,
• and one or more successive cylinders (in particular counter-drum cylinder and / or doffer cylinder (s) and / or condenser cylinder (s)), which in general have the function of forming on their periphery a web of nonwoven fibers from the fibers delivered by the carding drum; in the rest of this text, these cylinders will be generally referred to as "rolls of formation of a fiber web".

Several card output configurations implementing one or several successive cylinders for forming a fiber web are known nowadays. By way of non-exhaustive examples are given below the four most popular card output configurations.

A first known card output configuration, allowing the production of a parallel fiber web, implements in, for cylinders for forming the fiber web, one or more rollers successive.

A second known card output configuration, allowing the production of a scrambled fiber veil, uses, as cylinders formation of the fiber web, a cylinder commonly referred to as "counter-drum Followed by a doffer cylinder.

A third known card output configuration, allowing the production of a condensed fiber web, uses, as a cylinders forming the fiber veil, a doffer cylinder, followed by less a condenser cylinder.

A fourth known card output configuration implements, as cylinders forming the fiber web, a counter-drum cylinder followed by a doffer cylinder and a condenser cylinder.

The fiber web produced by the card is then to be consolidated by any appropriate means (calendering, needling, ...) in order to forming a consolidated nonwoven having a greater mechanical strength. More particularly, in the case of forming multi-layer nonwovens, this fiber veil is superimposed before consolidation with one or more fiber sails which may, depending on the case, be produced in parallel with the means of the same card (frame with several outputs) or cards different. Also in the case of the formation of nonwovens composites, this fiber web can be superimposed with one or more other layers of fibers obtained by different techniques ( fiber type "melt-blown," spun ", ...)

To take again the veil of fibers formed at the exit of card, and forward it to the subsequent processing steps (in particular step consolidation), it is customary to use a detaching cylinder associated with a conveyor belt, the detaching cylinder having the function of taking the fiber sail from the periphery of the last sail forming cylinder of the out of the card, and to transfer this veil of fibers on the conveyor belt. This type of solution is for example described in the patent applications EP 0704561, EP 1 300 492 and EP 1318 217 of the Applicant or in the European patent application EP 1046731.

In the present text, the term "detacher" is used to designate a Cylinder whose peripheral seal is neutral (ie, unoriented) in contrast with the oriented lining of the sail forming cylinders (condenser, doffer, counter-drum). Most of the time, this is a cylinder having an isosceles tip seal. It can also be of a cylinder having longitudinal grooves all over its periphery, a smooth cylinder, or a perforated cylinder with a fixed suction sector such as for example that described in the patent French No. 1,500,746.

In the aforementioned European patent applications EP 0704561, EP 1300492 and EP 1318217 of the Applicant, the detaching cylinder [EP 0704561: cylinder (4) or (22) / EP 1300492: cylinder (15a) or (15b) / EP 1318217: cylinder (31)] takes up the fiber web at the periphery of the last sail formation cylinder of the card with a cusp down, the veil of fibers thus being taken up in the lower part by the detacher cylinder. It is the same with regard to the solution of the FIG. 1 of the European patent application EP 1046731 [release cylinder (4)].

Conversely, in the solution of Figure 2 of the patent application EP 1046731, the detaching cylinder [EP 1046731: FIG. - cylinder (4) or (4a)] takes up the veil of fibers at the periphery of the last sail formation cylinder of the card with a cusp upwards, the veil of fibers being thus taken up in the upper part by the cylinder spotter.

Carding configuration for the formation of a fiber web condensed illustrated in Figure 2 of the European patent application EP 1046731 has the advantage of implementing a single cylinder condenser [cylinder (22) or (24)] at the end of the card, and is therefore more advantageous for example that the card configuration of the request for European patent EP 1 300492 which implements two cylinders successive condensers [figure 1 - successive condenser cylinders (12a) / 13 (a) or condenser cylinders (12b) / 13b)].

On the other hand, the plaintiff found that a configuration of Card output of the type shown in Figure 2 of the application for the application European patent EP 1046731, that is to say with detaching cylinder ensuring the recovery of the fibrous veil with a cusp to the high, had the disadvantage of causing formation in the veil of bubbles visible to the naked eye, and detrimental to the quality of the fibrous veil produced. A bubble is a point area of the veil in which the fibers are locally loosened and form a kind of blister on the surface of the sail. This phenomenon of bubble formation is particularly preponderant in the case of the formation of condensed sails, but is also likely to occur with parallel sails or with scrambled sails. The increase in production speed is accompanied by also an increase in the presence of bubbles in the veil.

OBJECTIVE OF THE INVENTION

The present invention aims to improve the quality of a fiber web produced by means of a card, and taken out of the card by a cylinder detacher with a cusp up, and more particularly aims to reduce the risk of bubble formation in such a sail.

SUMMARY OF THE INVENTION

The aforementioned objective is achieved by the invention which has for its first object a card for the formation of at least one veil of fibers, which is of the type of of FIG. 2 of the European patent application EP 1 046 731 in that it comprises on the one hand a detaching cylinder whose function is to collect on its periphery and with a cusp up, the veil of fibers previously formed, and on the other hand a conveying surface of the veil of fibers, positioned downstream of the detaching cylinder.

Characteristically according to the invention, between the cylinder detacher and the transport surface is interposed a transfer member rotating rotor with the function of transferring the fiber webs between the detaching cylinder and the transport surface while maintaining by suction the fiber veil.

The suction of the transfer member is adjusted so as to reduce, and preferably so as to avoid the formation of bubbles in the fiber web.

• la carde comprend un cylindre condenseur positionné immédiatement en amont du cylindre détacheur ;
• la carde comporte un cylindre peigneur positionné immédiatement en amont du cylindre condenseur ;
• la carde comporte un tambour de cardage principal, et entre le tambour de cardage et le cylindre détacheur, un ou plusieurs cylindres successifs de formation de voile, dont un unique cylindre condenseur ;
• la carde comporte un tambour de cardage principal, et une succession de cylindres qui est interposée entre le tambour de cardage principal et le cylindre détacheur, et qui est choisie parmi le groupe suivant : cylindre peigneur/cylindre condenseur, ou cylindre transfert accumulateur/cylindre peigneur /premier cylindre condenseur/deuxième cylindre condenseur, ou cylindre transfert accumulateur/cylindre peigneur ;
• l'organe de transfert aspirant est un cylindre ;
• l'organe de transfert aspirant est une bande de transport ;
• le cylindre détacheur est un cylindre aspirant.

More particularly, and in a nonlimiting and non-exhaustive manner of the invention, the card has the following additional technical characteristics, taken separately or in combination:

• the card comprises a condenser cylinder positioned immediately upstream of the detaching cylinder;
• the card has a doffer cylinder positioned immediately upstream of the condenser cylinder;
• the card has a main carding drum, and between the carding drum and the detaching cylinder, one or more successive formation cylinders, including a single condenser cylinder;
• the card has a main carding drum, and a series of cylinders which is interposed between the main carding drum and the detaching cylinder, and which is selected from the following group: dancer cylinder / condenser cylinder, or accumulator transfer cylinder / dancer cylinder / first condenser cylinder / second condenser cylinder, or accumulator transfer cylinder / doffer cylinder;
• the suction transfer member is a cylinder;
• the suction transfer member is a conveyor belt;
• the detaching cylinder is a suction cylinder.

Another object of the invention is a training method a carded fiber web. This process is known, in particular by FIG. of the European Patent Application EP 1046731, in that a veil is formed fibers by means of one or more successive cylinders of a card, detach this fiber web from the periphery of the last formation cylinder of sail by means of a detaching cylinder and with a point of curl upward, and the fiber web is deposited on a surface transport.

In a characteristic manner according to the invention, the veil of fibers between the detaching cylinder and the transport surface by keeping it by suction against the surface of a rotary transfer member.

Preferably, the detaching cylinder is rotated with a circumferential speed of at least 130 m / min and more preferably still greater than or equal to 150 m / min.

BRIEF DESCRIPTION OF THE FIGURES

• la figure 1 représente une première variante de réalisation d'une carde de l'invention à deux sorties, chaque sortie de la carde comportant successivement comme cylindres de formation de voile : un cylindre peigneur et un unique cylindre condenseur ;
• la figure 2 représente une deuxième variante de réalisation d'une carde de l'invention à deux sorties, chaque sortie de la carde comportant successivement comme cylindres de formation de voile : un cylindre transfert accumulateur (commun aux deux sorties), un cylindre peigneur et deux cylindres condenseur ;
• la figure 3 représente une troisième variante de réalisation d'une carde de l'invention à deux sorties, chaque sortie de la carde comportant en guise de cylindres de formation de voile : un cylindre transfert accumulateur (commun aux deux sorties), et un cylindre peigneur ;
• la figure 4 représente une quatrième variante de réalisation d'une carde de l'invention, dont la sortie comporte les mêmes cylindres que la variante de la figure 1, mais pour laquelle la position du cylindre de transfert aspirant a été optimisée, dans le but de réduire le trajet du voile de fibres à la périphérie du cylindre détacheur ;
• la figure 5 représente une cinquième variante de réalisation d'une carde de l'invention mettant en oeuvre un cylindre détacheur aspirant, et
• les figures 6 et 7 représentent respectivement une sixième et une septième variante de réalisation d'une carde de l'invention, mettant en oeuvre une bande transport aspirante en guise d'organe de transfert rotatif.

Other features and advantages of the invention will appear more clearly on reading the following detailed description of several preferred examples of card reclasation according to the invention, which detailed description is given by way of non-limiting example and non-exhaustive of the invention, and with reference to the accompanying drawings in which:

• 1 shows a first embodiment of a card of the invention with two outputs, each output of the card having successively as forming sail cylinders: a doffer cylinder and a single condenser cylinder;
• FIG. 2 represents a second variant embodiment of a card of the invention with two outputs, each output of the card comprising successively as sail formation cylinders: an accumulator transfer cylinder (common to the two outputs), a doffer cylinder and two condenser cylinders;
• 3 shows a third embodiment of a card of the invention with two outputs, each output of the card comprising by way of sail forming cylinders: a transfer cylinder accumulator (common to both outputs), and a cylinder doffer;
• FIG. 4 represents a fourth variant embodiment of a card of the invention, the output of which has the same cylinders as the variant of FIG. 1, but for which the position of the suction transfer cylinder has been optimized for the purpose to reduce the path of the fiber web at the periphery of the detaching roll;
• FIG. 5 represents a fifth variant embodiment of a card of the invention implementing a suction detaching cylinder, and
• Figures 6 and 7 show respectively a sixth and a seventh embodiment of a card of the invention, implementing a suction conveyor belt as a rotary transfer member.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a first variant embodiment of a card which conforms to the invention and which, in the particular example illustrated, has two upper and lower outputs for production in parallel of two fibrous webs V1 and V2. In a simplified variant, the card could only have one exit. This card features usual way a main carding drum 1 (commonly called "big drum") which allows the parallelization of fibers in cooperating in a manner known per se with carding members mounted to the periphery of the carding drum. In Figure 1, for the sake of simplification, these carding organs, as well as all the other elements of the which are positioned upstream of the carding drum 1 and which are usual, have not been represented. For a complete description of these elements (carding members and card elements upstream of the drum of carding 1), reference should be made to the description of the application for European patent EP 1318217 of the applicant.

In the particular example of Figure 1, the two outputs lower and upper of the card are identical, the two fibrous webs V1 and V2 products being similar. In another variant, the two outputs could present different configurations.

Each output of the card of Figure 1 comprises successively from the carding drum 1: a doffer cylinder 2, a cylinder condenser 3, a detacher cylinder 4 with isosceles tips 4a, a cylinder of suction transfer 5, and a conveyor belt 6.

The comb cylinder 2 and the condenser cylinder 3 constitute the cylinders for forming the fibrous web (V1 or V2). In the usual way, these cylinders make it possible to form a condensed fibrous web (V1 or V2), presenting a better isotropy of its mechanical properties, comparatively for example to a parallel veil. For this purpose, the cylinders Comber 2 and condenser 3 comprise, in a known manner, a filling oriented device 2a, 3a whose teeth are inclined in the direction contrary to the rotation of these cylinders; the condenser cylinder 3 is driven rotation in the opposite direction of the doffer cylinder 2, and with a circumferential speed significantly lower than that of the doffer cylinder 2.

In operation of the card, the detaching cylinder 4 is driven by rotation in the same direction as the condenser cylinder 3 and with a circumferential speed at least equal to and preferably greater than of the condenser cylinder 3, and draws the condensed web (V1 or V2) from the periphery of the condenser cylinder 3. More precisely, the fibrous veil arrives in the sampling zone from above the condenser cylinder 3, and is picked up by the detaching cylinder 4 with a cusp P to the high ; in other words, the detaching cylinder 4, which is rotated in the same direction as the last sail forming cylinder (i.e. condenser cylinder 3 in the example of FIG. 1) takes up the fibrous veil on its periphery to route it up.

The fibrous web is conveyed to the periphery of the detaching cylinder 4 to the suction transfer cylinder 5.

The suction transfer cylinder has a cylindrical envelope 5a which is perforated over its entire surface and which is rotatable, and a chamber fixed suction defined by two fixed inner walls 5c. This room 5b suction extends over the entire length of the cylindrical casing 5a and on a limited sector of this envelope (suction sector AB). This chamber 5b is connected to a fan or equivalent allowing depressurize the suction chamber 5b, and thereby create through the cylindrical shell 5a and the suction sector AB, a sufficient suction to press the fibrous web to the surface of the cylinder of transfer 5.

In operation, the perforated cylindrical casing 5a of the cylinder of transfer 5 is rotated, for example by means of an engine individual, in the opposite direction of the detaching cylinder 4. The speed circumferential circumference of the cylindrical envelope 5a of the transfer cylinder 5 can as the case may be equal to or greater than the circumferential speed of the detaching cylinder 4, or being less than the circumferential speed of the detachment cylinder 4. The fibrous veil is removed, without cusp, from the periphery of the detaching cylinder by the cylinder of transfer 5, and is conveyed by the suction transfer cylinder 5 to the surface of the conveyor belt 6. Between the detacher cylinder 4 and the belt transport 6, the fibrous web is constantly maintained by suction against the cylindrical casing 5a of the transfer cylinder 5.

Downstream of the suction section (AB) of the transfer cylinder 5, the veil fibrous material is deposited on the surface of the conveyor belt 6. Preferably, but optionally according to the invention, the conveyor belt is permeable to the air, and to help the recovery of the fibrous veil by the transport 6, the fibrous web is aspirated locally through the web of transport 6, and over the entire width of this band, by means of a box 7. For a detailed description of this aspiration, the man of the trade will refer to the description of the European patent application EP 0 704 561 from the applicant. The fibrous veil is thus plated by suction against the conveyor belt 6. The conveyor belt 6 is driven at a linear speed which, depending on the case, may be greater or equal to the circumferential speed of the transfer cylinder 5, or on the contrary less than the circumferential speed of the transfer cylinder 5 (condensation of the veil during its transfer on the conveyor belt 6).

Table I below corresponds to a nonlimiting example of operation of the card just described, for the parallel production of two substantially identical condensed fiber webs V1 and V2 formed from a fiber mixture. polypropylene and viscose fibers of average length of the order of 38mm. organs Large drum (1) Peindre Cylinder (2) Condenser Cylinder (3) Cylinder Detacher (4) Transfer Cylinder (5) Transport band (6) Weight of the veil (gr / m ² ) / 8.5 15.6 / 1 / Circumferential (or linear) speed (m / min) 1000-1560 220 120 130-200 130-200 150-200

The cylindrical envelope 5a of the transfer cylinder 5 was perforated a multitude of identical holes regularly distributed throughout the the surface of the envelope, and with a perforation rate (ie the ratio between the total area of the perforations and the total area of the envelope cylindrical) of between 25% and 35%. In operation, the air speeds through the perforations of the cylindrical envelope 5a were included between 0.5m / s and 3m / s. The invention is not limited to these parameters particular of the aspiration which are given only as an indication. he particularly those skilled in the art to adapt on a case-by-case basis parameters, and in particular to adjust the power of the suction of such so that it is sufficient for the veil of fibers to be transferred without bubble formation in the veil.

Comparative tests were carried out with the card of FIG. with implementation and without implementation of an aspiration at the level of sector AB of the transfer cylinder 5. These tests have shown, in the absence of suction, the fiber web (V1 or V2) contained bubbles visible to the naked eye and forming randomly in the veil. He has furthermore, it was found that bubble formation increased with speed of production. Typically, in the tests conducted, and in a non limiting of the invention, it was found that bubbles were formed systematically in the fibrous veil from production speeds greater than 150 m / min (circumferential speeds of the stripper cylinder and transfer cylinder).

Conversely, and surprisingly, by implementing a suction on the transfer cylinder 5 according to the invention, it is capable of producing, especially at high speed (typically greater than 150 m / min) a quality fibrous web, free of bubbles.

A plausible explanation (found a posteriori) of this result advantageous of the invention would be the following. In the absence of suction on the transfer cylinder 5, the fibers of the veil, during the course of the veil between the detacher cylinder 4 and conveyor belt 6, are not maintained mechanically, and so tend to relax and relax from uncontrolled way, which would cause the formation of bubbles. This loosening phenomenon would be increased in the case of a veil condensed, in which the fibers of the veil were compressed in the direction of their length during the operation of condensation by the cylinder condenser 3, and therefore naturally have a tendency to relax releases them mechanically. In the context of the invention, the aspiration to transfer cylinder level would physically maintain in place the fibers of the veil during its transfer to the strip of transport, and incidentally reduce the phenomenon of loosening of fibers sufficiently to prevent the formation of bubbles. The plaintiff however, is not bound by this explanation.

It was also found that the implementation of the aspiration to Transfer cylinder level advantageously allowed to increase the range setting of the operating speed of the detacher cylinder 4, for given operating speeds of the doffer rollers 2 and condenser 3.

• par la mise en oeuvre d'un cylindre transfert accumulateur T additionnel interposé entre le tambour de cardage 1, et les deux cylindres peigneurs ; pour une meilleure compréhension de la structure et de la fonction de ce cylindre transfert accumulateur T, on se référera à la demande de brevet européen EP 1 318 217 de la demanderesse, et en particulier aux explications données sur la structure et le fonctionnement du cylindre référencé (3i) sur la figure 1 de cette publication ;
• par la mise en oeuvre d'un cylindre condenseur additionnel 3' entre le cylindre peigneur 2 et le cylindre condenseur 3.

FIG. 2 shows another alternative embodiment of a card according to the invention, which differs from the variant of FIG. 1:

• by the implementation of an additional accumulator transfer cylinder T interposed between the carding drum 1, and the two combing rollers; for a better understanding of the structure and function of this accumulator transfer cylinder T, reference is made to the European patent application EP 1 318 217 of the applicant, and in particular to the explanations given on the structure and operation of the referenced cylinder. (3i) in Figure 1 of this publication;
• by the implementation of an additional condenser cylinder 3 'between the doffer cylinder 2 and the condenser cylinder 3.

FIG. 3 shows another variant embodiment of a card according to the invention, which differs from the variant of FIG. by the implementation on each output only of a doffer cylinder 2, the condenser cylinders having been removed. The detaching cylinder 4 takes directly the fibrous veil at the periphery of the doffer cylinder 2, with a cusp P upwards. This card allows output two parallel fiber veils.

The variant of Figure 4 is similar to that of Figure 1 (on this Figure 4 the carding drum 1 has not been shown), and differs from it by optimizing the position of the suction transfer cylinder 5 by relative to the detaching cylinder 4. Compared with FIG. aspirant of the variant of Figure 4 is closer to the last cylinder of formation of the veil (condenser cylinder 3), and the course of the veil between the last veil forming cylinder (condenser cylinder 3) and the transport 6 is shorter (especially at the periphery of the stripper cylinder 4), which further reduces the risk of loosening fibers.

In the variant of FIG. 5, the detaching cylinder 4 is advantageously a suction cylinder so that the fiber web in output of the doffer cylinder is constantly maintained by suction at the periphery of the detacher cylinder 4, up to the area of recovery by the cylinder suction transfer 5. This avoids the risk of loosening fibers from the web to the periphery of the detaching cylinder 4.

In the variant of FIG. 6, the card has three outputs of Identical sail formation (doffer cylinder 2 / condenser cylinder 3 / cylinder detacher 4) and a single rotary 5 'suction transfer member common to the three cylinders detacher 4. This sucking transfer member 5 ' has a transport belt 5'a inclined and permeable to air, and a aspiration through and over the entire width of said strip is implemented by means of suction boxes 5'b. This aspiration is implemented on the entire area of the conveyor belt that extends from the cylinder detacher 4 up to the area of recovery by the conveyor belt 6. In operation, the three fiber webs V1, V2, V3 are superimposed on the surface of the suction belt 5'a, being constantly maintained by suction on the surface of this band 5'a, then are deposited on the strip of transport 6.

The variant of FIG. 7 differs from that of FIG. the orientation of the conveyor belt 6, and by the implementation of a suction cylinder 8, which is positioned in the junction zone between transport belts 5'a and 6, which is used to transfer the sails superimposed V1, V2 and V3 between the conveyor belt 5'a and the strip of transport 6.

In another variant (not shown), the conveyor belt 6 could be provided for two-way operation, and allow the transport of the fiber web or sails to two different consolidation according to the training direction of the band of transport.

The invention is not limited to particular embodiments have been described with reference to the appended figures. In particular, the invention may apply to any card output configuration in which the detaching cylinder takes from the periphery the veil of fibers previously formed, with a cusp (P) upward. The cylinders of formation of sail arranged upstream of the detacher cylinder are not limited to the types of cylinders of the appended figures (that is to say, doffer, condenser or transfer). The invention can also be applied to a card having a counter-drum cylinder as a formation cylinder sailing.

Claims (10)

Carde for the formation of at least one fiber web (V1, V2, or V3) and having a detaching cylinder (4) which has the function of taking, on its periphery and with a cusp (P) upwards , the fiber web previously formed, and a transport surface (6) of the fiber web positioned downstream of the detaching cylinder (4), characterized in that between the detaching cylinder (4) and the transport surface (6) a sucking rotary transfer member (5; 5 ') is arranged to transfer the fiber web between the detaching cylinder (4) and the conveying surface (6) by holding the fiber web by suction. Card according to Claim 1, characterized in that it comprises a condenser cylinder (3) positioned immediately upstream of the detaching cylinder (4). Card according to Claim 2, characterized in that it comprises a combing cylinder (2) positioned immediately upstream of the condenser cylinder (3). Card according to Claim 1, characterized in that it comprises a main carding drum (1), and between the carding drum (1) and the detaching cylinder (4), one or more successive cylinders for forming a sail, of which one single condenser cylinder (3). Card according to Claim 1, characterized in that it comprises a main carding drum (1) and a succession of rolls which is interposed between the main carding drum (1) and the detaching roll (4), and which is chosen from the following group: combo cylinder (2) / condenser cylinder (3), or accumulator transfer cylinder (T) / combo cylinder (2) / first condenser cylinder (3 ') / second condenser cylinder (3), or accumulator transfer cylinder ( T) / combing cylinder (2). Card according to one of claims 1 to 5 characterized in that the suction transfer member is a cylinder (5). Card according to one of claims 1 to 5 characterized in that the suction transfer member is a conveyor belt (5 '). Card according to any one of claims 1 to 7 characterized in that the detaching cylinder (4) is a suction cylinder. A process for forming a fiber web in which a web of fibers (V1, V2, or V3) is formed by means of one or more successive rolls of a card, is detached from the periphery of the fiber web last sail forming cylinder, by means of a detaching cylinder (4) and with a cusp (P) upwards, and the fiber web (V1, V2, or V3) is deposited on a transport surface (6), characterized in that the fiber web (V1, V2, or V3) is transferred between the detaching roll and the transport surface by holding it against the surface of a rotary transfer member (5; 5 '). Method according to claim 9 characterized in that the detaching cylinder (4) is rotated with a circumferential speed of at least 130 m / min, and preferably greater than or equal to 150 m / min.

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