EP0704561A1 - Device for taking off and transporting, with a high speed, a fibre web at the exit of a carding machine - Google Patents

Device for taking off and transporting, with a high speed, a fibre web at the exit of a carding machine Download PDF

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Publication number
EP0704561A1
EP0704561A1 EP94490055A EP94490055A EP0704561A1 EP 0704561 A1 EP0704561 A1 EP 0704561A1 EP 94490055 A EP94490055 A EP 94490055A EP 94490055 A EP94490055 A EP 94490055A EP 0704561 A1 EP0704561 A1 EP 0704561A1
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EP
European Patent Office
Prior art keywords
web
cylinder
detaching
detaching cylinder
conveyor
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94490055A
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German (de)
French (fr)
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EP0704561B2 (en
EP0704561B1 (en
Inventor
Marc Brabant
Jean-Louis Dupont
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Thibeau SA
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Thibeau SA
Thibeau et Cie SA
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Application filed by Thibeau SA, Thibeau et Cie SA filed Critical Thibeau SA
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/465—Doffing arrangements for removing fibres using, or cooperating with, pneumatic means
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres

Definitions

  • the present invention relates to the recovery and transport of a fibrous veil at the outlet of the card. Its main object is a device which makes it possible to detach and transport at high speed a fibrous web at the outlet of the last working cylinder of a card, without causing any notable modification in the structure of the web and in particular of drawing of this web.
  • a detaching cylinder of small diameter which is adjacent to the last working cylinder of the card, and which is rotated at the same speed and in the same sense that the last worker cylinder.
  • the last working cylinder will for example be a doffer, whose function is to parallelize the fibers of the veil, or on the contrary a condenser having the function of blurring the fibers of the veil between them, so as to increase the cohesion of this veil in the direction transverse to the working direction of the card.
  • the external surface of the cylinder is designed so as to allow the fibrous web to be hooked over the entire periphery of the detaching cylinder, with however less adhesion than that of the web on the last working cylinder. It could for example be a cylinder equipped with an isosceles lining or even a cylinder having longitudinal grooves over its entire periphery.
  • the second known type of detaching cylinder consists of a perforated cylinder, comprising a fixed suction sector facing the last working cylinder.
  • a detaching cylinder has for example been described in French Patent No. 1,500,746.
  • the fibrous web arrives at the suction sector, it is pressed against the periphery of the detaching cylinder in rotation. Beyond this suction sector, the fibrous web theoretically no longer adheres to the periphery of the detaching cylinder.
  • the rotation of the detaching cylinder causes downstream of the suction sector a superficial peripheral suction flow which tends to maintain the fibrous web on this cylinder, which results, in the absence of additional means of recovery of the web, by a winding of the web to the periphery of the suction cylinder.
  • the first aforementioned type of detaching cylinder has the main advantage of allowing a more reliable recovery of the fibrous web at the periphery of the working cylinder.
  • the counterpart of this reliability results in an adhesion of the fibrous veil at the periphery of the detaching cylinder which is stronger than that of the fibrous veil at the periphery of the suction detaching cylinder, beyond the suction sector.
  • the object of the present invention is therefore to propose a device which makes it possible to detach and transport a fibrous web at the outlet of the card, without cause modification in the structure of the web, and in particular without causing this web to stretch, and thereby accelerate the rate of work of the card without harming the quality of the fibrous web produced.
  • the device of the invention which in known manner comprises a detaching cylinder which is adjacent to the last working cylinder of the card.
  • this device further comprises suction means and a belt conveyor, the band of which is breathable, and has, at least at this detaching cylinder, a rectilinear portion for receiving the web. , which passes near the detaching cylinder with substantially the same linear speed as the peripheral speed of the detaching cylinder, and in a direction orthogonal to the axis of rotation of the detaching cylinder, and which is interposed between the suction means and the cylinder detacher.
  • the web when the web arrives in the vacuum zone created by the suction means between the detaching cylinder and the rectilinear portion of the conveyor belt used to receive the web, under the combined effects of the gravity and suction, it is detached from the periphery of the detaching cylinder and is posed as it is on the surface and in the extension of the conveyor belt.
  • the latter being driven at substantially the same linear speed as the peripheral speed of the detaching cylinder, the web is not stretched in the direction of its length.
  • the distance between the rectilinear portion of reception of the veil and the periphery of the detaching cylinder must be sufficiently small, so that during its transfer, the veil does not undergo floating which could damage it or cause transverse fold lines in the veil .
  • this distance is equal to or slightly greater than the thickness of the veil.
  • This value of the distance is not, however, limiting of the invention, since it has been possible in practice to adjust this distance up to a value which can reach a hundred times the thickness of the web. product, without observing deterioration of the veil, which is visible to the naked eye. Furthermore, with regard to the lower limit of this distance, it was possible to test values less than the thickness of the uncompressed web, without this causing any change in the appearance of the web.
  • the suction flow created through the conveyor belt should be sufficient to compress the web sufficiently in the region of the detaching cylinder, so that the veil is no longer in contact with the periphery of the detaching cylinder, once laid on the straight portion of the conveyor belt.
  • the conveyor of the device of the invention can be used to convey the web from the last carding cylinder to a device for processing this web such as for example the rollers of a calender.
  • this belt conveyor can also be an integral part of a machine arranged at the card outlet. More particularly, this conveyor may constitute the entrance apron of a machine, such as for example a lapper spreader.
  • the distance separating the rectilinear portion for receiving the web and the periphery of the detaching cylinder will be adjustable so that it can be adapted to different thicknesses of web.
  • the suction flow that is created through the straight portion of the conveyor belt must be strong enough to compensate for the adhesion of the fibrous web to the periphery of the detaching cylinder. This power depends on several parameters, among which the grammage of the fibrous web produced, the inclination of the rectilinear portion of reception of the web relative to the horizontal, and the type of detaching cylinder used.
  • the vacuum zone created by the suction means has the following characteristics. It extends at least over the entire width of the web, which makes it possible to avoid any risk of folding of the longitudinal edges of the web during its transfer between the detaching cylinder and the conveyor belt; it starts at the line of quasi-tangency between the detaching cylinder and the portion rectilinear reception of the web, or upstream of this line of quasi-tangency, and extends downstream of the line of quasi-tangency over at least one radius of the detaching cylinder.
  • the terms upstream and downstream are here and in the rest of this text defined with respect to the direction of movement of the rectilinear portion for receiving the web.
  • the high speed rotation of the detaching cylinder creates downstream of the line of quasi-tangency between this cylinder and the rectilinear portion for receiving the veil, a suction flow which tends to keep the fibrous veil pressed against the periphery of the detaching cylinder. . Consequently, if the beginning of the depression zone is positioned downstream of this line of quasi-tangency, the fibrous web will tend, beyond this line of quasi-tangency, to continue its winding on the periphery of the detaching cylinder, and move away from the vacuum zone.
  • the veil becomes more difficult to detach from the periphery of the detaching cylinder, and on the other hand that the transfer of this veil on the conveyor belt, if it is carried out beyond this line.
  • quasi-tangency risk of causing the web to float between the detaching cylinder and the conveyor belt, which is detrimental to the cohesion of this web.
  • the effects of the turbulence created in particular by the rotation of the detaching cylinder downstream of the quasi-tangency line are mainly felt in the space located between the periphery of the detaching cylinder and the rectilinear portion for receiving the web, downstream of the line of quasi-tangency. For this reason, in order to avoid any risk of lifting the web on the surface of the conveyor belt, it is preferable to extend the vacuum zone from the quasi-tangency line, and over at least a distance equivalent to the radius of the detaching cylinder.
  • the distance separating the line of quasi-tangency, and the beginning of the vacuum zone located upstream of this line is less than the radius of the detaching cylinder.
  • the vacuum zone created by the suction means is not constant, and the vacuum increases continuously or almost continuously to a maximum of the vacuum zone, then decreases continuously until the end of the depression area.
  • the maximum of the vacuum zone is located at the level of the line of quasi-tangency, or downstream of this line, being distant from it by a maximum radius of the detaching cylinder.
  • a suction box whose suction face, located opposite the rectilinear portion of the portion of the web, is constituted by two converging inclined planes and separated by a slot suction, which is arranged substantially in a direction orthogonal to the direction of movement of said straight portion.
  • the suction slot corresponds to the maximum of the depression zone, the inclined planes making it possible to decrease this depression, with a gradient depending on the inclination of each plane.
  • the present invention therefore also has another object as a card equipped at the outlet with at least two devices of the invention, and which are arranged to allow the superposition of the sails from their two detaching cylinders.
  • the card is equipped at the outlet with a single conveyor belt which is common to the two devices.
  • each device having its own conveyor belt, a first conveyor routes a first veil to the belt of the second conveyor, so as to position this first veil above and in the extension of the belt from this second transporter; the second conveyor is equipped, at the junction zone between the two bands, with suction means which allow the first veil to be placed on the veil carried by the second conveyor.
  • Figure 1 There is shown in Figure 1 the last working cylinder 1 of a card, and a device 3 for detaching the fibrous web 2 which is wound at the periphery of the working cylinder 1, and subsequently transport this web at high speed.
  • This device 3 consists of a detaching cylinder 4, a conveyor belt 5 and a suction box 6.
  • the detaching cylinder 4 is adjacent to the working cylinder 1, and is driven in the same direction of rotation and with the same speed around of its axis of rotation 7.
  • the periphery of this cylinder is fitted with a gasket 8 with isosceles points.
  • the conveyor 5 comprises a strip with multiple perforations, and which is therefore permeable to air.
  • the portion 9 of this strip shown in FIG. 1 is rectilinear, and passes close to the periphery of the detaching cylinder 4, in a direction orthogonal to the axis of rotation 7 of this detaching cylinder. It is also driven with the same linear speed as the peripheral speed of the detaching cylinder 4.
  • the straight portion 9 of the conveyor belt 5 is inclined upward relative to the horizontal at an angle ⁇ .
  • This inclination is mainly conditioned by problems of space of the conveyor 5 relative to the main drum (not shown) of the card, and is linked to the position of the working cylinder 1 relative to this drum, as well as to the position of the detaching cylinder with respect to the working cylinder 1. It is therefore conceivable that this angle ⁇ is zero, which is illustrated in the example of a card in FIG. 2C.
  • the distance between the rectilinear portion 9 for receiving the web and the periphery of the detaching cylinder, that is to say in this case the tips of the lining 8, is represented in FIG. 1 by the distance e .
  • the position of the axis of rotation 7 of the detaching cylinder 4 was adjustable in a direction orthogonal to the rectilinear portion 9 for receiving the web, so that the distance e is adjustable as a function of the thickness of the web.
  • the suction box 6 is positioned opposite the detaching cylinder 4, on the other side of the straight portion 9 of the conveyor belt, and creates a vacuum zone 10 of width L between the detaching cylinder 4 and the straight portion 9 of the conveyor belt 5, which straight portion 9 comes almost to the tangent of the detaching cylinder, along a line T called the line of quasi-tangency.
  • the vacuum zone 10 begins upstream and at a distance d from the line of quasi-tangency T, relative to the direction of movement D of the strip 9, and extends in downstream of this quasi-tangency line, over a distance of .
  • detaching cylinder a smooth cylinder.
  • the adhesion would be mainly due to this surface air flow.
  • a perforated suction cylinder as a detaching cylinder.
  • the advantage of using a detaching cylinder with isosceles lining or the like is to increase the reliability of the recovery of the web by this cylinder. It should be noted that a comparable degree of reliability would be obtained with a detaching cylinder having longitudinal grooves over its entire periphery.
  • the web 2 When the web 2 arrives at the start of the vacuum zone 10, it begins to detach from the periphery of the detaching cylinder 4, at point B, under the combined effects of gravity and the suction flow created by the box 6 to through the strip 9. As a result, the web 2 is placed on the strip 9 at the level of the quasi-tangency line T and is held on the surface of this strip 9 until the exit from the vacuum zone 10.
  • the distance e must be sufficiently small so that the web 2 does not undergo deformation, in particular under the effect of its own weight or of the air flow generated by the rotation of the detaching cylinder 4, when it passes from the periphery of the cylinder detacher 4 to the conveyor belt 5.
  • the zone of depression extends until the effects of this zone of turbulence are no longer felt, and that it is preferable that the distance from which separates the end of the zone of depression 10 of the line of quasi-tangency T is in practice at least equal to the radius r of the detaching cylinder 4.
  • the fibrous web is entrained without sliding on the surface of the belt 9 of the conveyor, by the thin layer of air which is generated by the movement of this band.
  • the speed of the web is therefore identical to the speed of the conveyor belt.
  • This being also identical to the peripheral speed of the detaching cylinder 4, it follows that the fibrous web does not undergo any stretching. It should be noted that in practice, it is possible to tolerate a speed variation of up to 2% between the linear speed of the conveyor and the peripheral speed of the detaching cylinder, without this variation causing a change in the structure of the web. which is detrimental to the quality and cohesion of the veil produced.
  • the suction box 6 comprises a suction face constituted by two converging inclined planes 11 a , 11 b , substantially forming a V and separated by a suction slot 12, which is arranged in a direction orthogonal to the direction of movement D of the straight portion 9 of the conveyor belt 5.
  • This suction face preferably extends over the entire width of the web 2 so that the vacuum zone between the conveyor belt and the detaching cylinder 4 reaches the edges of this sail.
  • This suction box 6 creates a variable vacuum zone, which increases from point B to a maximum at the suction slot 12, then decreases until the end of the vacuum zone. The speed of the suction flow generated by this suction box through the straight portion 9 of the conveyor belt 5 is therefore maximum. at the suction slot 12.
  • the vacuum zone 10 must make it possible to at least compensate for the adhesion of the fibrous web to the periphery of the detaching cylinder 4, as well as the effects of the turbulence created downstream of the quasi-tangency line T.
  • the characteristics of this depression zone depend mainly on the type of detaching cylinder used, the grammage of the fibrous web produced and of the angle of inclination ⁇ of the straight portion 9.
  • the radius r of the cylinder with isosceles lining was approximately 80 mm; the suction box 6 was positioned so that the distance d was about 20 mm, and the distance d was substantially equal to the radius r ; the speed of the suction flow, measured between the detaching cylinder 4 and the straight portion 9, at the level of the suction slot 12, was between 1 and 2 m / second; the angle ⁇ could vary in absolute value between 0 and 90 ° and the distance e was adjustable in O and 50 mm.
  • suction box 6 which has been described by any type of suitable suction means. More particularly, it is conceivable to use a suction box creating a vacuum zone with vacuum gradients which are different upstream or downstream of the suction slot 12, which results in a different inclination of the two. convergent planes 11 a , 11 b .
  • the fibrous web produced has a reduced thickness and lower grammage. Consequently, in order to avoid any risk of winding the fibrous web at the periphery of the detaching cylinder 4, when the card starts, it is possible within the framework of the invention to increase the suction flow generated by the box 6, until the card has reached its normal speed and the veil produced has the required characteristics of weight and thickness.
  • FIGS. 2A, 2B and 2C show three possible examples of configuration at the output of the card, allowing the parallel production of two fibrous webs, and their superposition.
  • the main drum of the card is referenced 13.
  • the first upper outlet channel consists of a counter-drum 14, a doffer 15, and two successive condensers 16 and 17; the second lower outlet channel is constituted by a counter-drum 18 and a comber 19.
  • These two outlet channels are respectively equipped with a device 20, 21, which is similar to that of FIG. 1.
  • the detaching cylinder and the suction box of each device are respectively referenced 22 and 23; the last condenser cylinder 17 for the upper track and the comb cylinder 19 for the lower track correspond to the working cylinder 1 of the device of FIG. 1.
  • this belt conveyor comprises a rectilinear portion 24, which is used for the reception of the two fibrous webs at the level of the two devices 20 and 21.
  • this rectilinear portion 24 is conveyed by this rectilinear portion 24 to the entrance to the vacuum zone created by the suction box 23 of the device 20 of the upper channel.
  • the second fibrous web coming from the upper track is superimposed on the first fibrous web, the suction flow created by the suction box making it possible both to maintain the first fibrous web coming from the lower track to the surface of the rectilinear portion 24 and detach the second fibrous web from the upper track to superimpose it on the first fibrous web.
  • the detaching cylinder 22 and the suction box 23 of the device 20 of the upper outlet channel are positioned on either side of the straight portion 25 of the belt conveyor, just downstream the change of direction of the conveyor belt.
  • This alternative embodiment has the advantage of avoiding the risks of detachment of the fibrous web during the change of direction of the conveyor. In fact, when the first fibrous web coming from the lower track arrives at this change of direction, it is kept on the surface of the conveyor due to the presence of the suction box 23 just downstream of this change of direction.
  • each device 20, 21 has its own conveyor belt 26, 27.
  • the detaching cylinder 22 of each device 20, 21 is situated substantially directly above the condenser 17 and the comber 19 respectively.
  • the conveyor 25 is horizontal.
  • the conveyor 27 is inclined downward and allows the routing of the fibrous web coming from the upper track to the surface and in the extension of the transporter 27. The superposition of the two fibrous webs coming from the card is therefore carried out at the level of the zone. junction 28 between the two conveyors 26 and 27.
  • suction means whose function is on the one hand to maintain the first fibrous web from the lower path to the surface of the conveyor 27 during the superposition of the two webs and on the other hand to place, on this conveyor 27, the fibrous web conveyed by the conveyor 26.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Laminated Bodies (AREA)
  • Vending Machines For Individual Products (AREA)

Abstract

The appts. to take a fibre web (2) from the delivery roller (4) of a carding machine has a suction system and permeable belt (5). A straight section (9) of the belt (5), at the level of the delivery roller (4), takes the web (2) at the same linear speed as the surface speed of the roller. It is on the same line as the roller axis (7), between the suction system and the roller. Also claimed is a carding machine with at least two delivery stations with delivery rollers to pass their webs to the permeable belt.

Description

La présente invention concerne la reprise et le transport d'un voile fibreux en sortie de carde. Elle a pour principal objet un dispositif qui permet de détacher et de transporter à grande vitesse un voile fibreux en sortie du dernier cylindre travailleur d'une carde, sans occasionner de modification notable dans la structure du voile et notamment d'étirage de ce voile.The present invention relates to the recovery and transport of a fibrous veil at the outlet of the card. Its main object is a device which makes it possible to detach and transport at high speed a fibrous web at the outlet of the last working cylinder of a card, without causing any notable modification in the structure of the web and in particular of drawing of this web.

Actuellement, pour détacher un voile fibreux en sortie de carde, il est connu d'utiliser un cylindre détacheur de faible diamètre, qui est adjacent au dernier cylindre travailleur de la carde, et qui est entraîné en rotation à la même vitesse et dans le même sens que le dernier cylindre travailleur. Le dernier cylindre travailleur sera par exemple un peigneur, dont la fonction est de paralléliser les fibres du voile, ou au contraire un condenseur ayant pour fonction de brouiller les fibres du voile entre elles, en sorte d'augmenter la cohésion de ce voile dans la direction transversale au sens de travail de la carde.Currently, to detach a fibrous web at the outlet of the card, it is known to use a detaching cylinder of small diameter, which is adjacent to the last working cylinder of the card, and which is rotated at the same speed and in the same sense that the last worker cylinder. The last working cylinder will for example be a doffer, whose function is to parallelize the fibers of the veil, or on the contrary a condenser having the function of blurring the fibers of the veil between them, so as to increase the cohesion of this veil in the direction transverse to the working direction of the card.

Il existe principalement deux types connus de cylindres détacheurs. Selon un premier type, la surface externe du cylindre est conçue en sorte de permettre l'accrochage du voile fibreux sur toute la périphérie du cylindre détacheur, avec toutefois une adhérence moindre que celle du voile sur le dernier cylindre travailleur. Il pourra par exemple s'agir d'un cylindre équipé d'une garniture isocèle ou encore d'un cylindre présentant des cannelures longitudinales sur toute sa périphérie.There are mainly two known types of detaching cylinders. According to a first type, the external surface of the cylinder is designed so as to allow the fibrous web to be hooked over the entire periphery of the detaching cylinder, with however less adhesion than that of the web on the last working cylinder. It could for example be a cylinder equipped with an isosceles lining or even a cylinder having longitudinal grooves over its entire periphery.

Le deuxième type connu de cylindre détacheur consiste en un cylindre perforé, comportant un secteur d'aspiration fixe en regard du dernier cylindre travailleur. Un tel cylindre détacheur a par exemple été décrit dans le brevet français N°1 500 746. Lorsque le voile fibreux arrive au niveau du secteur d'aspiration, il se trouve plaqué à la périphérie du cylindre détacheur en rotation. Au-delà de ce secteur d'aspiration, le voile fibreux n'adhère théoriquement plus à la périphérie du cylindre détacheur. En pratique, la rotation du cylindre détacheur occasionne en aval du secteur d'aspiration un flux d'aspiration périphérique superficiel qui a tendance à maintenir le voile fibreux sur ce cylindre, ce qui se traduit, en l'absence de moyens complémentaires de reprise du voile, par un enroulement du voile à la périphérie du cylindre aspirant.The second known type of detaching cylinder consists of a perforated cylinder, comprising a fixed suction sector facing the last working cylinder. Such a detaching cylinder has for example been described in French Patent No. 1,500,746. When the fibrous web arrives at the suction sector, it is pressed against the periphery of the detaching cylinder in rotation. Beyond this suction sector, the fibrous web theoretically no longer adheres to the periphery of the detaching cylinder. In practice, the rotation of the detaching cylinder causes downstream of the suction sector a superficial peripheral suction flow which tends to maintain the fibrous web on this cylinder, which results, in the absence of additional means of recovery of the web, by a winding of the web to the periphery of the suction cylinder.

Comparativement au cylindre détacheur aspirant, le premier type précité de cylindre détacheur présente le principal avantage de permettre une reprise plus fiable du voile fibreux à la périphérie du cylindre travailleur. Cependant, la contrepartie de cette fiabilité se traduit par une adhérence du voile fibreux à la périphérie du cylindre détacheur qui est plus forte que celle du voile fibreux à la périphérie du cylindre détacheur aspirant, au-delà du secteur d'aspiration.Compared to the suction detaching cylinder, the first aforementioned type of detaching cylinder has the main advantage of allowing a more reliable recovery of the fibrous web at the periphery of the working cylinder. However, the counterpart of this reliability results in an adhesion of the fibrous veil at the periphery of the detaching cylinder which is stronger than that of the fibrous veil at the periphery of the suction detaching cylinder, beyond the suction sector.

Avec les deux types de cylindres détacheurs connus, il est nécessaire d'utiliser des moyens complémentaires de reprise du voile fibreux, en vue d'acheminer ce voile jusqu'à son opération suivante de traitement ; il s'agira par exemple d'une opération de consolidation du voile fibreux, par passage entre deux calandres.With the two known types of detaching cylinders, it is necessary to use additional means for taking up the fibrous web, in order to route this web to its next treatment operation; it will be for example an operation of consolidation of the fibrous veil, by passage between two calenders.

Jusqu'à présent, pour reprendre ce voile à la périphérie du cylindre détacheur, on le fait passer entre deux cylindres en rotation, ou encore entre la bande d'un transporteur et un cylindre en rotation positionné juste au-dessus du transporteur. Avec de tels moyens, la reprise du voile s'accompagne nécessairement d'un étirage du voile dans le sens de sa longueur. Or, le voile fibreux en sortie de carde présente une cohésion très faible, avec une résistance très faible à un effort de traction transversale. Par conséquent, lorsqu'on provoque un étirement de ce voile dans le sens de sa longueur , on réduit d'autant la cohésion de ce voile. Il en résulte, qu'au-delà d'une vitesse maximale de travail de la carde, qui est actuellement de l'ordre de 120 m/minute, l'étirage du voile devient trop important et on obtient un voile de mauvaise qualité quant à son aspect, sa régularité de poids et l'isotropie de ses propriétés mécaniques.So far, to resume this veil at the periphery of the detaching cylinder, it is passed between two rotating cylinders, or between the belt of a conveyor and a rotating cylinder positioned just above the conveyor. With such means, the resumption of the veil is necessarily accompanied by a stretching of the veil in the direction of its length. However, the fibrous web on leaving the card has very low cohesion, with very low resistance to a transverse tensile force. Consequently, when this veil is stretched in the direction of its length, the cohesion of this veil is correspondingly reduced. As a result, beyond a maximum working speed of the carding machine, which is currently around 120 m / minute, the stretching of the veil becomes too great and a poor quality veil is obtained in to its appearance, its regularity of weight and the isotropy of its mechanical properties.

Le but de la présente invention est donc de proposer un dispositif qui permet de détacher et de transporter un voile fibreux en sortie de carde, sans occasionner de modification dans la structure du voile, et notamment sans provoquer d'étirage de ce voile, et par là même d'accélérer la cadence de travail de la carde sans nuire à la qualité du voile fibreux produit.The object of the present invention is therefore to propose a device which makes it possible to detach and transport a fibrous web at the outlet of the card, without cause modification in the structure of the web, and in particular without causing this web to stretch, and thereby accelerate the rate of work of the card without harming the quality of the fibrous web produced.

Ce but est parfaitement atteint par le dispositif de l'invention, qui de manière connue comporte un cylindre détacheur qui est adjacent au dernier cylindre travailleur de la carde.This object is perfectly achieved by the device of the invention, which in known manner comprises a detaching cylinder which is adjacent to the last working cylinder of the card.

De manière caractéristique, ce dispositif comprend en outre des moyens d'aspiration et un transporteur à bande, dont la bande est perméable à l'air, et possède, au moins au niveau de ce cylindre détacheur, une portion rectiligne pour la réception du voile, qui passe à proximité du cylindre détacheur avec sensiblement la même vitesse linéaire que la vitesse périphérique du cylindre détacheur, et dans une direction orthogonale à l'axe de rotation du cylindre détacheur, et qui est interposée entre les moyens d'aspiration et le cylindre détacheur.Typically, this device further comprises suction means and a belt conveyor, the band of which is breathable, and has, at least at this detaching cylinder, a rectilinear portion for receiving the web. , which passes near the detaching cylinder with substantially the same linear speed as the peripheral speed of the detaching cylinder, and in a direction orthogonal to the axis of rotation of the detaching cylinder, and which is interposed between the suction means and the cylinder detacher.

Dans le dispositif de l'invention, lorsque le voile arrive dans la zone de dépression créée par les moyens d'aspiration entre le cylindre détacheur et la portion rectiligne de la bande du transporteur servant à la réception du voile, sous les effets combinés de la gravité et de l'aspiration, il se détache de la périphérie du cylindre détacheur et se pose en l'état à la surface et dans le prolongement de la bande de transport. Celle-ci étant entraînée sensiblement à la même vitesse linéaire que la vitesse périphérique du cylindre détacheur, le voile ne subit pas d'étirement dans le sens de sa longueur. La distance séparant la portion rectiligne de réception du voile et la périphérie du cylindre détacheur doit être suffisamment faible, afin que pendant son transfert , le voile ne subisse pas de flottement susceptible de le détériorer ou d'occasionner des lignes de pliure transversales dans le voile. Il est donc préférable que cette distance soit égale ou légèrement supérieure à l'épaisseur du voile. Cette valeur de la distance n'est cependant pas limitative de l'invention , étant donné qu'il a été possible en pratique de régler cette distance jusqu'à une valeur pouvant atteindre cent fois l'épaisseur du voile produit, sans observer de détérioration du voile, qui soit visible à l'oeil nu. En outre s'agissant de la limite inférieure de cette distance, il a été possible de tester des valeurs inférieures à l'épaisseur du voile non compressé, sans que cela occasionne de modification de l'aspect du voile. Dans ce cas, le flux d'aspiration créé à travers la bande du transporteur devrait être suffisant pour comprimer suffisamment le voile dans la région du cylindre détacheur, afin que le voile ne soit plus en contact avec la périphérie du cylindre détacheur, une fois posé sur la portion rectiligne de la bande du transporteur.In the device of the invention, when the web arrives in the vacuum zone created by the suction means between the detaching cylinder and the rectilinear portion of the conveyor belt used to receive the web, under the combined effects of the gravity and suction, it is detached from the periphery of the detaching cylinder and is posed as it is on the surface and in the extension of the conveyor belt. The latter being driven at substantially the same linear speed as the peripheral speed of the detaching cylinder, the web is not stretched in the direction of its length. The distance between the rectilinear portion of reception of the veil and the periphery of the detaching cylinder must be sufficiently small, so that during its transfer, the veil does not undergo floating which could damage it or cause transverse fold lines in the veil . It is therefore preferable that this distance is equal to or slightly greater than the thickness of the veil. This value of the distance is not, however, limiting of the invention, since it has been possible in practice to adjust this distance up to a value which can reach a hundred times the thickness of the web. product, without observing deterioration of the veil, which is visible to the naked eye. Furthermore, with regard to the lower limit of this distance, it was possible to test values less than the thickness of the uncompressed web, without this causing any change in the appearance of the web. In this case, the suction flow created through the conveyor belt should be sufficient to compress the web sufficiently in the region of the detaching cylinder, so that the veil is no longer in contact with the periphery of the detaching cylinder, once laid on the straight portion of the conveyor belt.

Le transporteur du dispositif de l'invention peut être utilisé pour acheminer le voile depuis le dernier cylindre de carde, jusqu'à un dispositif de traitement de ce voile tel que par exemple les rouleaux d'une calandre. Dans le cadre de l'invention ce transporteur à bande peut également faire partie intégrante d'une machine disposée en sortie de carde. Plus particulièrement, ce transporteur pourra constituer le tablier d'entrée d'une machine, tel que par exemple un étaleur nappeur.The conveyor of the device of the invention can be used to convey the web from the last carding cylinder to a device for processing this web such as for example the rollers of a calender. In the context of the invention, this belt conveyor can also be an integral part of a machine arranged at the card outlet. More particularly, this conveyor may constitute the entrance apron of a machine, such as for example a lapper spreader.

Avantageusement la distance séparant la portion rectiligne de réception du voile et la périphérie du cylindre détacheur sera réglable en sorte de pouvoir être adaptée à différentes épaisseurs de voile.Advantageously, the distance separating the rectilinear portion for receiving the web and the periphery of the detaching cylinder will be adjustable so that it can be adapted to different thicknesses of web.

Le flux d'aspiration qui est créé à travers la portion rectiligne de la bande de transport doit être suffisamment puissant pour compenser l'adhérence du voile fibreux à la périphérie du cylindre détacheur. Cette puissance dépend de plusieurs paramètres, parmi lesquels le grammage du voile fibreux produit, l'inclinaison de la portion rectiligne de réception du voile par rapport à l'horizontale, et le type de cylindre détacheur utilisé.The suction flow that is created through the straight portion of the conveyor belt must be strong enough to compensate for the adhesion of the fibrous web to the periphery of the detaching cylinder. This power depends on several parameters, among which the grammage of the fibrous web produced, the inclination of the rectilinear portion of reception of the web relative to the horizontal, and the type of detaching cylinder used.

De préférence, la zone de dépression créée par les moyens d'aspiration présente les caractéristiques suivantes. Elle s'étend au moins sur toute la largeur du voile, ce qui permet d'éviter tout risque de repli des bords longitudinaux du voile lors de son transfert entre le cylindre détacheur et la bande du transporteur; elle démarre à la ligne de quasi-tangence entre le cylindre détacheur et la portion rectiligne de réception du voile, ou en amont de cette ligne de quasi-tangence, et s'étend en aval de la ligne de quasi-tangence sur au moins un rayon du cylindre détacheur. Les termes amont et aval sont ici et dans la suite du présent texte définis par rapport au sens de déplacement de la portion rectiligne de réception du voile. La rotation à grande vitesse du cylindre détacheur crée en aval de la ligne de quasi-tangence entre ce cylindre et la portion rectiligne de réception du voile, un flux d'aspiration qui a tendance à maintenir le voile fibreux plaqué contre la périphérie du cylindre détacheur. Par conséquent, si l'on positionne le début de la zone de dépression en aval de cette ligne de quasi-tangence, le voile fibreux aura tendance, au-delà de cette ligne de quasi-tangence, à poursuivre son enroulement sur la périphérie du cylindre détacheur, et à s'éloigner de la zone de dépression. Il en résulte d'une part que le voile devient plus difficile à détacher de la périphérie du cylindre détacheur, et d'autre part que le transfert de ce voile sur la bande du transporteur, s'il est effectué au - delà de cette ligne de quasi-tangence, risque d'occasionner un flottement du voile entre le cylindre détacheur et la bande du transporteur, qui est préjudiciable à la cohésion de ce voile. Les effets de la turbulence créée notamment par la rotation du cylindre détacheur en aval de la ligne de quasi-tangence se font principalement sentir dans l'espace situé entre la périphérie du cylindre détacheur et la portion rectiligne de réception du voile, en aval de la ligne de quasi-tangence. Pour cette raison, afin d'éviter tout risque de soulèvement du voile à la surface de la bande du transporteur, il est préférable de prolonger la zone de dépression depuis la ligne de quasi-tangence, et sur au moins une distance équivalente au rayon du cylindre détacheur.Preferably, the vacuum zone created by the suction means has the following characteristics. It extends at least over the entire width of the web, which makes it possible to avoid any risk of folding of the longitudinal edges of the web during its transfer between the detaching cylinder and the conveyor belt; it starts at the line of quasi-tangency between the detaching cylinder and the portion rectilinear reception of the web, or upstream of this line of quasi-tangency, and extends downstream of the line of quasi-tangency over at least one radius of the detaching cylinder. The terms upstream and downstream are here and in the rest of this text defined with respect to the direction of movement of the rectilinear portion for receiving the web. The high speed rotation of the detaching cylinder creates downstream of the line of quasi-tangency between this cylinder and the rectilinear portion for receiving the veil, a suction flow which tends to keep the fibrous veil pressed against the periphery of the detaching cylinder. . Consequently, if the beginning of the depression zone is positioned downstream of this line of quasi-tangency, the fibrous web will tend, beyond this line of quasi-tangency, to continue its winding on the periphery of the detaching cylinder, and move away from the vacuum zone. It follows on the one hand that the veil becomes more difficult to detach from the periphery of the detaching cylinder, and on the other hand that the transfer of this veil on the conveyor belt, if it is carried out beyond this line. quasi-tangency, risk of causing the web to float between the detaching cylinder and the conveyor belt, which is detrimental to the cohesion of this web. The effects of the turbulence created in particular by the rotation of the detaching cylinder downstream of the quasi-tangency line are mainly felt in the space located between the periphery of the detaching cylinder and the rectilinear portion for receiving the web, downstream of the line of quasi-tangency. For this reason, in order to avoid any risk of lifting the web on the surface of the conveyor belt, it is preferable to extend the vacuum zone from the quasi-tangency line, and over at least a distance equivalent to the radius of the detaching cylinder.

S'agissant du début de la zone de dépression, il est impératif, lorsque celui-ci est situé en amont de la ligne de quasi-tangence, que le flux d'aspiration ne puisse pas venir perturber la reprise du voile sur le cylindre travailleur par le cylindre détacheur. Plusieurs solutions sont envisageables. Il est possible de limiter la puissance du flux d'aspiration dans la portion de la zone de dépression située en amont de la ligne de quasi-tangence. Il est également possible d'interposer entre la bande de transport et la zone de reprise du voile par le cylindre détacheur, un déflecteur qui permet d'éviter que le flux d'aspiration n'atteigne le voile dans la zone de jonction entre le dernier cylindre travailleur de la carde et le cylindre détacheur. Cependant, afin d'éviter tout risque de perturbation de la reprise du voile par le cylindre détacheur sur le cylindre travailleur, il est préférable que la distance séparant la ligne de quasi-tangence, et le début de la zone de dépression située en amont de cette ligne, soit inférieure au rayon du cylindre détacheur.Regarding the start of the vacuum zone, it is imperative, when it is located upstream of the line of quasi-tangency, that the suction flow cannot disturb the recovery of the web on the working cylinder by the detaching cylinder. Several solutions are possible. It is possible to limit the power of the suction flow in the portion of the vacuum zone located upstream of the quasi-tangency line. It is also possible to interpose between the conveyor belt and the area where the veil is taken up by the detaching cylinder, a deflector which prevents the suction flow from reaching the veil in the junction zone between the last working carding cylinder and the cylinder detacher. However, in order to avoid any risk of disturbance of the recovery of the web by the detaching cylinder on the working cylinder, it is preferable that the distance separating the line of quasi-tangency, and the beginning of the vacuum zone located upstream of this line is less than the radius of the detaching cylinder.

Avantageusement la zone de dépression créée par les moyens d'aspiration n'est pas constante, et la dépression croît de façon continue ou quasi-continue jusqu'à un maximum de la zone de dépression, puis décroît de façon continue jusqu'à la fin de la zone de dépression. Dans ce cas, le maximum de la zone de dépression est situé au niveau de la ligne de quasi-tangence, ou en aval de cette ligne, en lui étant distant d'un rayon maximum du cylindre détacheur.Advantageously, the vacuum zone created by the suction means is not constant, and the vacuum increases continuously or almost continuously to a maximum of the vacuum zone, then decreases continuously until the end of the depression area. In this case, the maximum of the vacuum zone is located at the level of the line of quasi-tangency, or downstream of this line, being distant from it by a maximum radius of the detaching cylinder.

Pour obtenir cette zone de dépression non constante, on utilisera de préférence une boîte d'aspiration dont la face d'aspiration, située en regard de la portion rectiligne de la portion du voile, est constituée par deux plans inclinés convergents et séparés par une fente d'aspiration, qui est disposée sensiblement dans une direction orthogonale à la direction de déplacement de ladite portion rectiligne. La fente d'aspiration correspond au maximum de la zone de dépression, les plans inclinés permettant de faire décroître cette dépression, avec un gradient dépendant de l'inclinaison de chaque plan.To obtain this non-constant vacuum zone, it is preferable to use a suction box whose suction face, located opposite the rectilinear portion of the portion of the web, is constituted by two converging inclined planes and separated by a slot suction, which is arranged substantially in a direction orthogonal to the direction of movement of said straight portion. The suction slot corresponds to the maximum of the depression zone, the inclined planes making it possible to decrease this depression, with a gradient depending on the inclination of each plane.

Lorsqu'une carde comporte au moins deux voies de sortie équipées d'un dispositif de l'invention, il devient très facile d'effectuer la superposition de ces voiles sur une des bandes de transport de l'un des dispositifs. La présente invention a donc également pour autre objet une carde équipée en sortie d'au moins deux dispositifs de l'invention, et qui sont agencés pour permettre la superposition des voiles issus de leurs deux cylindres détacheurs.When a card has at least two exit channels equipped with a device of the invention, it becomes very easy to superimpose these sails on one of the conveyor belts of one of the devices. The present invention therefore also has another object as a card equipped at the outlet with at least two devices of the invention, and which are arranged to allow the superposition of the sails from their two detaching cylinders.

Dans un premier mode particulier de réalisation, la carde est équipée en sortie d'un unique transporteur à bande qui est commun aux deux dispositifs.In a first particular embodiment, the card is equipped at the outlet with a single conveyor belt which is common to the two devices.

Dans un deuxième mode particulier de réalisation, chaque dispositif possédant son propre transporteur à bande, un premier transporteur achemine un premier voile jusqu'à la bande du second transporteur, en sorte de positionner ce premier voile au-dessus et dans le prolongement de la bande de ce second transporteur ; le second transporteur est équipé, au niveau de la zone de jonction entre les deux bandes, de moyens d'aspiration qui permettent de poser le premier voile sur le voile véhiculé par le second transporteur.In a second particular embodiment, each device having its own conveyor belt, a first conveyor routes a first veil to the belt of the second conveyor, so as to position this first veil above and in the extension of the belt from this second transporter; the second conveyor is equipped, at the junction zone between the two bands, with suction means which allow the first veil to be placed on the veil carried by the second conveyor.

D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante de plusieurs modes particuliers de réalisation d'une carde équipée de deux dispositifs permettant de détacher et transporter à grande vitesse chaque voile fibreux en sortie de carde, laquelle description est donnée à titre d'exemple non limitatif, et en référence au dessin annexé sur lequel :

  • la figure 1 est une représentation schématique du dernier cylindre travailleur d'une carde et d'un dispositif de l'invention, qui permet la reprise d'un voile fibreux à la périphérie de ce cylindre travailleur,
  • les figures 2A et 2B sont des représentations schématiques d'une carde équipée de deux dispositifs de l'invention, partageant le même transporteur à bande,
  • et la figure 2C est une représentation schématique d'une carde équipée de deux dispositifs de l'invention possédant chacun leur propre transporteur à bande, lesquels transporteurs sont agencés de sorte de permettre la superposition des deux voiles issus de la carde.
Other characteristics and advantages of the invention will emerge from the following description of several particular embodiments of a card equipped with two devices making it possible to detach and transport at high speed each fibrous web leaving the card, which description is given in by way of nonlimiting example, and with reference to the appended drawing in which:
  • FIG. 1 is a schematic representation of the last working cylinder of a card and of a device of the invention, which allows the recovery of a fibrous web at the periphery of this working cylinder,
  • FIGS. 2A and 2B are schematic representations of a card equipped with two devices of the invention, sharing the same conveyor belt,
  • and FIG. 2C is a schematic representation of a card equipped with two devices of the invention each having their own conveyor belt, which conveyors are arranged so as to allow the superposition of the two webs coming from the card.

On a représenté à la figure 1 le dernier cylindre travailleur 1 d'une carde, et un dispositif 3 permettant de détacher le voile fibreux 2 qui est enroulé à la périphérie du cylindre travailleur 1, et de transporter ultérieurement ce voile à grande vitesse.There is shown in Figure 1 the last working cylinder 1 of a card, and a device 3 for detaching the fibrous web 2 which is wound at the periphery of the working cylinder 1, and subsequently transport this web at high speed.

Ce dispositif 3 est constitué par un cylindre détacheur 4, un transporteur à bande 5 et une boîte d'aspiration 6. Le cylindre détacheur 4 est adjacent au cylindre travailleur 1, et est entraîné dans le même sens de rotation et avec la même vitesse autour de son axe de rotation 7. La périphérie de ce cylindre est équipée d'une garniture 8 à pointes isocèles. Le transporteur 5 comporte une bande à perforations multiples, et qui de ce fait est perméable à l'air. La portion 9 de cette bande représentée à la figure 1 est rectiligne, et passe à proximité de la périphérie du cylindre détacheur 4, dans une direction orthogonale à l'axe de rotation 7 de ce cylindre détacheur. Elle est en outre entraînée avec la même vitesse linéaire que la vitesse périphérique du cylindre détacheur 4.This device 3 consists of a detaching cylinder 4, a conveyor belt 5 and a suction box 6. The detaching cylinder 4 is adjacent to the working cylinder 1, and is driven in the same direction of rotation and with the same speed around of its axis of rotation 7. The periphery of this cylinder is fitted with a gasket 8 with isosceles points. The conveyor 5 comprises a strip with multiple perforations, and which is therefore permeable to air. The portion 9 of this strip shown in FIG. 1 is rectilinear, and passes close to the periphery of the detaching cylinder 4, in a direction orthogonal to the axis of rotation 7 of this detaching cylinder. It is also driven with the same linear speed as the peripheral speed of the detaching cylinder 4.

Dans l'exemple particulier de la figure 1, la portion rectiligne 9 de la bande du transporteur 5 est incliné vers le haut par rapport à l'horizontal selon un angle α. Cette inclinaison est principalement conditionnée par des problèmes d'encombrement du transporteur 5 par rapport au tambour principal (non représenté) de la carde, et est liée à la position du cylindre travailleur 1 par rapport à ce tambour, ainsi qu'à la position du cylindre détacheur par rapport au cylindre travailleur 1. Il est donc envisageable que cette angle α soit nul, ce qui est illustré dans l'exemple de carde de la figure 2C.In the particular example of FIG. 1, the straight portion 9 of the conveyor belt 5 is inclined upward relative to the horizontal at an angle α . This inclination is mainly conditioned by problems of space of the conveyor 5 relative to the main drum (not shown) of the card, and is linked to the position of the working cylinder 1 relative to this drum, as well as to the position of the detaching cylinder with respect to the working cylinder 1. It is therefore conceivable that this angle α is zero, which is illustrated in the example of a card in FIG. 2C.

L'écartement entre la portion rectiligne 9 de réception du voile et la périphérie du cylindre détacheur, c'est à dire en l'occurrence les pointes de la garniture 8, est représentée sur la figure 1 par la distance e. Avantageusement, la position de l'axe de rotation 7 du cylindre détacheur 4 était ajustable dans une direction orthogonale à la portion rectiligne 9 de réception du voile, de telle sorte que la distance e soit réglable en fonction de l'épaisseur du voile. La boîte d'aspiration 6 est positionnée en regard du cylindre détacheur 4, de l'autre côté de la portion rectiligne 9 de la bande de transport, et crée une zone de dépression 10 de largeur L entre le cylindre détacheur 4 et la portion rectiligne 9 de la bande du transporteur 5, laquelle portion rectiligne 9 vient quasiment à la tangente du cylindre détacheur, selon une ligne T dite ligne de quasi-tangence.The distance between the rectilinear portion 9 for receiving the web and the periphery of the detaching cylinder, that is to say in this case the tips of the lining 8, is represented in FIG. 1 by the distance e . Advantageously, the position of the axis of rotation 7 of the detaching cylinder 4 was adjustable in a direction orthogonal to the rectilinear portion 9 for receiving the web, so that the distance e is adjustable as a function of the thickness of the web. The suction box 6 is positioned opposite the detaching cylinder 4, on the other side of the straight portion 9 of the conveyor belt, and creates a vacuum zone 10 of width L between the detaching cylinder 4 and the straight portion 9 of the conveyor belt 5, which straight portion 9 comes almost to the tangent of the detaching cylinder, along a line T called the line of quasi-tangency.

Dans l'exemple particulier illustré à la figure 1, la zone de dépression 10 débute en amont et à une distance d de la ligne de quasi-tangence T, par rapport au sens de déplacement D de la bande 9, et s'étend en aval de cette ligne de quasi-tangence , sur une distance d'.In the particular example illustrated in FIG. 1, the vacuum zone 10 begins upstream and at a distance d from the line of quasi-tangency T, relative to the direction of movement D of the strip 9, and extends in downstream of this quasi-tangency line, over a distance of .

Lorsque le voile 2 arrive au contact du cylindre détacheur 4, il est détaché de la périphérie du cylindre travailleur 1 par les pointes isocèles de la garniture 8 du cylindre détacheur. A partir du point A, ce voile est donc transféré et adhère à la périphérie du cylindre détacheur 4. Cette adhérence est due dans le cas présent principalement à l'action des pointes isocèles de la garniture 8, mais également au flux d'air superficiel engendré par le cylindre détacheur 4 à sa périphérie lors de la rotation. Ce flux d'air est symbolisé sur la figure 1, en aval de la ligne de quasi-tangence T par des flèches F.When the web 2 comes into contact with the detaching cylinder 4, it is detached from the periphery of the working cylinder 1 by the isosceles tips of the lining 8 of the detaching cylinder. From point A, this veil is therefore transferred and adheres to the periphery of the detaching cylinder 4. This adhesion is due in the present case mainly to the action of the isosceles tips of the lining 8, but also to the surface air flow generated by the detaching cylinder 4 at its periphery during rotation. This air flow is symbolized in Figure 1, downstream of the line of quasi-tangency T by arrows F.

On pourrait utiliser en guise de cylindre détacheur , un cylindre lisse. Dans ce cas, l'adhérence serait due principalement à ce flux d'air superficiel. Il est également envisageable dans le cadre de l'invention, d'utiliser un cylindre aspirant perforé en guise de cylindre détacheur. L'intérêt d'utiliser un cylindre détacheur à garniture isocèle ou similaire, est d'accroître la fiabilité de la reprise du voile par ce cylindre. Il est à noter que l'on obtiendrait un degré de fiabilité comparable avec un cylindre détacheur présentant des cannelures longitudinales sur toute sa périphérie.One could use as a detaching cylinder, a smooth cylinder. In this case, the adhesion would be mainly due to this surface air flow. It is also conceivable within the framework of the invention, to use a perforated suction cylinder as a detaching cylinder. The advantage of using a detaching cylinder with isosceles lining or the like is to increase the reliability of the recovery of the web by this cylinder. It should be noted that a comparable degree of reliability would be obtained with a detaching cylinder having longitudinal grooves over its entire periphery.

Lorsque le voile 2 arrive au début de la zone de dépression 10, il commence à se détacher de la périphérie du cylindre détacheur 4, au point B, sous les effets conjugués de la gravité et du flux d'aspiration créé par la boîte 6 à travers la bande 9. Il en résulte que le voile 2 se pose sur la bande 9 au niveau de la ligne de quasi-tangence T et est maintenu à la surface de cette bande 9 jusqu'à la sortie de la zone de dépression 10. La distance e doit être suffisamment faible pour que le voile 2 ne subisse pas de déformation notamment sous l'effet de son propre poids ou du flux d'air engendré par la rotation du cylindre détacheur 4, lorsqu'il passe de la périphérie du cylindre détacheur 4 à la bande du transporteur 5. Il est important de souligner que le déplacement de la bande du transporteur 5 dans le sens D engendre également à la surface de cette bande une couche d'air mince se déplaçant à la même vitesse et dans le même sens. Cette couche d'air mince et le flux d'aspiration engendré par le cylindre détacheur 4 créent dans l'espace situé entre le cylindre détacheur 4 et la bande 9, en amont de leur ligne T de quasi-tangence, une zone de turbulence qui tend à décoller le voile 2 de la surface de la bande 9. C'est pour cette raison qu'il est préférable que la zone de dépression s'étende jusqu'à ce que les effets de cette zone de turbulence ne se fassent plus sentir, et qu'il est préférable que la distance d' qui sépare la fin de la zone de dépression 10 de la ligne de quasi-tangence T soit en pratique au moins égale au rayon r du cylindre détacheur 4.When the web 2 arrives at the start of the vacuum zone 10, it begins to detach from the periphery of the detaching cylinder 4, at point B, under the combined effects of gravity and the suction flow created by the box 6 to through the strip 9. As a result, the web 2 is placed on the strip 9 at the level of the quasi-tangency line T and is held on the surface of this strip 9 until the exit from the vacuum zone 10. The distance e must be sufficiently small so that the web 2 does not undergo deformation, in particular under the effect of its own weight or of the air flow generated by the rotation of the detaching cylinder 4, when it passes from the periphery of the cylinder detacher 4 to the conveyor belt 5. It is important to emphasize that the movement of the conveyor belt 5 in the direction D also generates on the surface of this band a thin layer of air moving at the same speed and in the Same direction. This thin layer of air and the suction flow generated by the detaching cylinder 4 create in the space between the detaching cylinder 4 and the strip 9, upstream from their line T of quasi-tangency, a zone of turbulence which tends to take off the web 2 from the surface of the strip 9. It is for this reason that it is preferable that the zone of depression extends until the effects of this zone of turbulence are no longer felt, and that it is preferable that the distance from which separates the end of the zone of depression 10 of the line of quasi-tangency T is in practice at least equal to the radius r of the detaching cylinder 4.

Au-delà de cette zone de turbulence, le voile fibreux est entraîné sans glissement à la surface de la bande 9 du transporteur, par la couche d'air mince qui est engendrée par le déplacement de cette bande. La vitesse du voile est donc identique à la vitesse de la bande du transporteur. Celle-ci étant par ailleurs identique à la vitesse périphérique du cylindre détacheur 4, il en résulte que le voile fibreux ne subit aucun étirage. Il convient de noter qu'en pratique, il est possible de tolérer une variation de vitesse pouvant atteindre 2% entre la vitesse linéaire du transporteur et la vitesse périphérique du cylindre détacheur, sans que cette variation n'occasionne une modification de la structure du voile qui soit préjudiciable à la qualité et à la cohésion du voile produit.Beyond this zone of turbulence, the fibrous web is entrained without sliding on the surface of the belt 9 of the conveyor, by the thin layer of air which is generated by the movement of this band. The speed of the web is therefore identical to the speed of the conveyor belt. This being also identical to the peripheral speed of the detaching cylinder 4, it follows that the fibrous web does not undergo any stretching. It should be noted that in practice, it is possible to tolerate a speed variation of up to 2% between the linear speed of the conveyor and the peripheral speed of the detaching cylinder, without this variation causing a change in the structure of the web. which is detrimental to the quality and cohesion of the veil produced.

Dans l'exemple particulier de la figure 1, la boîte d'aspiration 6 comporte une face d'aspiration constituée par deux plans inclinés convergents 11a, 11b, formant sensiblement un V et séparés par une fente d'aspiration 12, qui est disposée dans une direction orthogonale à la direction de déplacement D de la portion rectiligne 9 de la bande du transporteur 5. Cette face d'aspiration s'étend de préférence sur toute la largeur du voile 2 de telle sorte que la zone de dépression entre la bande du transporteur et le cylindre détacheur 4 atteigne les lisières de ce voile. Cette boîte d'aspiration 6 permet de créer une zone de dépression variable, qui augmente depuis le point B jusqu'à un maximum au niveau de la fente d'aspiration 12, puis qui décroît jusqu'à la fin de la zone de dépression. La vitesse du flux d'aspiration engendrée par cette boîte d'aspiration à travers la portion rectiligne 9 de la bande du transporteur 5 est donc maximale au niveau de la fente d'aspiration 12.In the particular example of FIG. 1, the suction box 6 comprises a suction face constituted by two converging inclined planes 11 a , 11 b , substantially forming a V and separated by a suction slot 12, which is arranged in a direction orthogonal to the direction of movement D of the straight portion 9 of the conveyor belt 5. This suction face preferably extends over the entire width of the web 2 so that the vacuum zone between the conveyor belt and the detaching cylinder 4 reaches the edges of this sail. This suction box 6 creates a variable vacuum zone, which increases from point B to a maximum at the suction slot 12, then decreases until the end of the vacuum zone. The speed of the suction flow generated by this suction box through the straight portion 9 of the conveyor belt 5 is therefore maximum. at the suction slot 12.

On comprend à la lumière de la description qui a été faite du transfert du voile fibreux du cylindre détacheur 4 à la portion rectiligne 9 du transporteur 5, que la zone de dépression 10 doit permettre d'au moins compenser l'adhérence du voile fibreux à la périphérie du cylindre détacheur 4, ainsi que les effets de la turbulence créée en aval de la ligne de quasi-tangence T. Les caractéristiques de cette zone de dépression dépendent principalement du type de cylindre détacheur utilisé, du grammage du voile fibreux produit et de l'angle d'inclinaison α de la portion rectiligne 9.It will be understood from the description which has been given of the transfer of the fibrous web from the detaching cylinder 4 to the rectilinear portion 9 of the conveyor 5, that the vacuum zone 10 must make it possible to at least compensate for the adhesion of the fibrous web to the periphery of the detaching cylinder 4, as well as the effects of the turbulence created downstream of the quasi-tangency line T. The characteristics of this depression zone depend mainly on the type of detaching cylinder used, the grammage of the fibrous web produced and of the angle of inclination α of the straight portion 9.

Dans un exemple précis de réalisation, le rayon r du cylindre à garniture isocèle était d'environ 80 mm ; la boîte d'aspiration 6 était positionnée de telle sorte que la distance d valait environ 20 mm, et la distance d'était sensiblement égale au rayon r ; la vitesse du flux d'aspiration, mesurée entre le cylindre détacheur 4 et la portion rectiligne 9, au niveau de la fente d'aspiration 12, était comprise entre 1 et 2 m/seconde ; l'angle α pouvait varier en valeur absolue entre 0 et 90° et la distance e était réglable en O et 5Omm .En mettant en oeuvre cet exemple précis de réalisation, il a été possible de détacher et transporter en sortie de carde un voile ayant un grammage compris entre 5g/m² et 100g/m² , et avec une vitesse pouvant atteindre 300 m/minute, tout en conservant l'isotropie des propriétés mécaniques de ce voile. A titre indicatif l'épaisseur e du voile pour un grammage de 1Og/m² était de l'ordre de 5mm.In a specific embodiment, the radius r of the cylinder with isosceles lining was approximately 80 mm; the suction box 6 was positioned so that the distance d was about 20 mm, and the distance d was substantially equal to the radius r ; the speed of the suction flow, measured between the detaching cylinder 4 and the straight portion 9, at the level of the suction slot 12, was between 1 and 2 m / second; the angle α could vary in absolute value between 0 and 90 ° and the distance e was adjustable in O and 50 mm. By implementing this specific embodiment, it was possible to detach and transport at the outlet of the card a veil having a grammage between 5g / m² and 100g / m², and with a speed of up to 300 m / minute, while retaining the isotropy of the mechanical properties of this veil. As an indication, the thickness e of the web for a grammage of 10g / m² was of the order of 5mm.

Il est bien entendu possible dans le cadre de l'invention de remplacer la boîte d'aspiration 6 qui a été décrite par tout type de moyens d'aspiration approprié. Plus particulièrement, il est envisageable d'utiliser une boîte d'aspiration créant une zone de dépression avec des gradients de dépression qui sont différents en amont ou en aval de la fente d'aspiration 12, ce qui se traduit par une inclinaison différente des deux plans convergents 11a, 11b.It is of course possible within the framework of the invention to replace the suction box 6 which has been described by any type of suitable suction means. More particularly, it is conceivable to use a suction box creating a vacuum zone with vacuum gradients which are different upstream or downstream of the suction slot 12, which results in a different inclination of the two. convergent planes 11 a , 11 b .

Au démarrage de la carde, tant que celle-ci n'a pas atteint son régime normal de fonctionnement, le voile fibreux produit présente une épaisseur moindre et un grammage plus faible. Par conséquent, afin d'éviter tout risque d'enroulement du voile fibreux à la périphérie du cylindre détacheur 4, au démarrage de la carde, il est possible dans le cadre de l'invention d'augmenter le flux d'aspiration engendré par la boîte 6, jusqu'à ce que la carde ait atteint son régime normal et que le voile produit présente les caractéristiques requises de poids et d'épaisseur.At the start of the card, as long as it has not reached its normal operating regime, the fibrous web produced has a reduced thickness and lower grammage. Consequently, in order to avoid any risk of winding the fibrous web at the periphery of the detaching cylinder 4, when the card starts, it is possible within the framework of the invention to increase the suction flow generated by the box 6, until the card has reached its normal speed and the veil produced has the required characteristics of weight and thickness.

On a représenté aux figures 2A, 2B et 2C trois exemples possibles de configuration en sortie de carde, permettant la production en parallèle de deux voiles fibreux, et leur superposition. Sur ces figures, le tambour principal de la carde est référencé 13. La première voie de sortie supérieure est constituée d'un contre-tambour 14, d'un peigneur 15, et de deux condenseurs successifs 16 et 17; la deuxième voie de sortie inférieure est constituée par un contre-tambour 18 et un peigneur 19. Ces deux voies de sortie sont équipées respectivement d'un dispositif 20,21, qui est semblable à celui de la figure 1. Le cylindre détacheur et la boîte d'aspiration de chaque dispositif sont respectivement référencés 22 et 23 ; le dernier cylindre condenseur 17 pour la voie supérieure et le cylindre peigneur 19 pour la voie inférieure correspondent au cylindre travailleur 1 du dispositif de la figure 1.FIGS. 2A, 2B and 2C show three possible examples of configuration at the output of the card, allowing the parallel production of two fibrous webs, and their superposition. In these figures, the main drum of the card is referenced 13. The first upper outlet channel consists of a counter-drum 14, a doffer 15, and two successive condensers 16 and 17; the second lower outlet channel is constituted by a counter-drum 18 and a comber 19. These two outlet channels are respectively equipped with a device 20, 21, which is similar to that of FIG. 1. The detaching cylinder and the suction box of each device are respectively referenced 22 and 23; the last condenser cylinder 17 for the upper track and the comb cylinder 19 for the lower track correspond to the working cylinder 1 of the device of FIG. 1.

Dans les deux exemples des figures 2A et 2B, on utilise un unique transporteur à bande pour les deux voies de sortie. Dans l'exemple de la figure 2A, ce transporteur à bande comporte une portion rectiligne 24, qui est utilisée pour la réception des deux voiles fibreux au niveau des deux dispositifs 20 et 21. Ainsi le premier voile fibreux, issu de la voie inférieure, est acheminé par cette portion rectiligne 24 jusqu'à l'entrée de la zone de dépression créée par la boîte d'aspiration 23 du dispositif 20 de la voie supérieure. Au niveau de cette zone de dépression, le deuxième voile fibreux issu de la voie supérieure vient se superposer sur le premier voile fibreux, le flux d'aspiration créé par la boîte d'aspiration permettant à la fois de maintenir le premier voile fibreux issu de la voie inférieure à la surface de la portion rectiligne 24 et de détacher le deuxième voile fibreux issu de la voie supérieure pour le superposer au premier voile fibreux.In the two examples of FIGS. 2A and 2B, a single belt conveyor is used for the two exit channels. In the example of FIG. 2A, this belt conveyor comprises a rectilinear portion 24, which is used for the reception of the two fibrous webs at the level of the two devices 20 and 21. Thus the first fibrous web, coming from the lower track, is conveyed by this rectilinear portion 24 to the entrance to the vacuum zone created by the suction box 23 of the device 20 of the upper channel. At this depression zone, the second fibrous web coming from the upper track is superimposed on the first fibrous web, the suction flow created by the suction box making it possible both to maintain the first fibrous web coming from the lower track to the surface of the rectilinear portion 24 and detach the second fibrous web from the upper track to superimpose it on the first fibrous web.

Dans l'exemple de la figure 2B, le cylindre détacheur 22 et la boîte d'aspiration 23 du dispositif 20 de la voie de sortie supérieure sont positionnés de part et d'autre de la portion rectiligne 25 du transporteur à bande, juste en aval du changement de direction de la bande de ce transporteur. Cette variante de réalisation présente l'avantage d'éviter les risques de décollement du voile fibreux lors du changement de direction du transporteur. En effet, lorsque le premier voile fibreux issu de la voie inférieure arrive au niveau de ce changement de direction, il se trouve maintenu à la surface du transporteur du fait de la présence de la boîte d'aspiration 23 juste en aval de ce changement de direction.In the example of FIG. 2B, the detaching cylinder 22 and the suction box 23 of the device 20 of the upper outlet channel are positioned on either side of the straight portion 25 of the belt conveyor, just downstream the change of direction of the conveyor belt. This alternative embodiment has the advantage of avoiding the risks of detachment of the fibrous web during the change of direction of the conveyor. In fact, when the first fibrous web coming from the lower track arrives at this change of direction, it is kept on the surface of the conveyor due to the presence of the suction box 23 just downstream of this change of direction.

Dans le troisième exemple de la figure 2C, chaque dispositif 20, 21 possède son propre transporteur à bande 26, 27. Le cylindre détacheur 22 de chaque dispositif 20, 21 est situé sensiblement à l'aplomb respectivement du condenseur 17 et du peigneur 19. Le transporteur 25 est horizontal. Le transporteur 27 est incliné vers le bas et permet l'acheminement du voile fibreux issu de la voie supérieure à la surface et dans le prolongement du transporteur 27. La superposition des deux voiles fibreux issus de la carde est donc réalisée au niveau de la zone de jonction 28 entre les deux transporteurs 26 et 27. Au niveau de cette zone de jonction 28 sont en outre prévus des moyens d'aspiration supplémentaires dont la fonction est d'une part de maintenir le premier voile fibreux issu de la voie inférieure à la surface du transporteur 27 lors de la superposition des deux voiles et d'autre part de poser, sur ce transporteur 27, le voile fibreux acheminé par le transporteur 26.In the third example of FIG. 2C, each device 20, 21 has its own conveyor belt 26, 27. The detaching cylinder 22 of each device 20, 21 is situated substantially directly above the condenser 17 and the comber 19 respectively. The conveyor 25 is horizontal. The conveyor 27 is inclined downward and allows the routing of the fibrous web coming from the upper track to the surface and in the extension of the transporter 27. The superposition of the two fibrous webs coming from the card is therefore carried out at the level of the zone. junction 28 between the two conveyors 26 and 27. At this junction zone 28 are further provided additional suction means whose function is on the one hand to maintain the first fibrous web from the lower path to the surface of the conveyor 27 during the superposition of the two webs and on the other hand to place, on this conveyor 27, the fibrous web conveyed by the conveyor 26.

Claims (11)

Dispositif pour détacher et transporter à grande vitesse un voile fibreux (2) en sortie de carde, sans occasionner de modification notable dans la structure du voile, et notamment d'étirage de ce voile, du type comportant un cylindre détacheur (4) qui est adjacent au dernier cylindre travailleur (1) de la carde, caractérisé en ce qu'il comprend en outre des moyens d'aspiration et un transporteur à bande (5), dont la bande est perméable à l'air, et possède, au moins au niveau de ce cylindre détacheur (4), une portion rectiligne (9) pour la réception du voile (2), qui passe à proximité du cylindre détacheur (4) avec sensiblement la même vitesse linéaire que la vitesse périphérique du cylindre détacheur (4), dans une direction orthogonale à l'axe de rotation (7) du cylindre détacheur, et qui est interposée entre les moyens d'aspiration et le cylindre détacheur.Device for detaching and transporting at high speed a fibrous web (2) at the outlet of the card, without causing any notable modification in the structure of the web, and in particular of drawing of this web, of the type comprising a detaching cylinder (4) which is adjacent to the last working cylinder (1) of the card, characterized in that it further comprises suction means and a belt conveyor (5), the band of which is breathable, and has, at least at this detaching cylinder (4), a rectilinear portion (9) for receiving the web (2), which passes near the detaching cylinder (4) with substantially the same linear speed as the peripheral speed of the detaching cylinder (4 ), in a direction orthogonal to the axis of rotation (7) of the detaching cylinder, and which is interposed between the suction means and the detaching cylinder. Dispositif selon la revendication 1 caractérisé en ce que la distance entre la périphérie du cylindre détacheur (4) et la portion rectiligne (9) de réception du voile est réglable.Device according to claim 1 characterized in that the distance between the periphery of the detaching cylinder (4) and the straight portion (9) for receiving the web is adjustable. Dispositif selon l'une des revendications 1 ou 2 caractérisé en ce que la distance e entre la portion rectiligne (9) de réception du voile et la périphérie du cylindre détacheur (4) est de préférence égale ou légèrement supérieure à l'épaisseur ε du voile.Device according to either of Claims 1 and 2, characterized in that the distance e between the rectilinear portion (9) for receiving the web and the periphery of the detaching cylinder (4) is preferably equal to or slightly greater than the thickness ε of the sail. Dispositif selon la revendication 1 caractérisé en ce que les moyens d'aspiration créent entre la portion rectiligne (9) de réception du voile (2) et le cylindre détacheur (4) une zone de dépression (10) qui s'étend au moins sur toute la largeur du voile (2), qui démarre à la ligne de quasi-tangence T entre le cylindre détacheur (4) et la portion rectiligne (9) de réception du voile, ou en amont de cette ligne de quasi-tangence T par rapport au sens de déplacement D de la portion rectiligne (9) de réception du voile, et qui s'étend en aval de la ligne de quasi-tangence T sur au moins un rayon r du cylindre détacheur.Device according to Claim 1, characterized in that the suction means create between the rectilinear portion (9) for receiving the web (2) and the detaching cylinder (4) a vacuum zone (10) which extends at least over the entire width of the web (2), which starts at the line of quasi-tangency T between the detaching cylinder (4) and the rectilinear portion (9) for receiving the web, or upstream of this line of quasi-tangency T by relative to the direction of movement D of the rectilinear portion (9) for receiving the web, and which extends downstream from the line of quasi-tangency T over at least one radius r of the detaching cylinder. Dispositif selon la revendication 4 caractérisé en ce que la distance d entre la ligne de quasi-tangence T et le début de la zone de dépression est inférieure au rayon r du cylindre détacheur (4).Device according to claim 4 characterized in that the distance d between the line of quasi-tangency T and the start of the depression zone is less than radius r of the detaching cylinder (4). Dispositif selon la revendication 4 ou 5 caractérisé en ce que les moyens d'aspiration sont conçus en sorte de créer une zone de dépression (10) non constante, avec une valeur de dépression qui croît de façon continue ou quasi continue jusqu'à un maximum depuis le début de la puis qui décroît de façon continue ou quasi continue jusqu'à la fin de la zone de dépression.Device according to claim 4 or 5 characterized in that the suction means are designed so as to create a non-constant depression zone (10), with a depression value which increases continuously or almost continuously to a maximum from the start of the then decreasing continuously or almost continuously until the end of the depression zone. Dispositif selon la revendication 6 caractérisé en ce que les moyens d'aspiration consistent en une boîte d'aspiration (6) dont la face d'aspiration, située en regard de la portion rectiligne (9) de réception du voile, est constituée par deux plans inclinés convergents (11a, 11b) et séparés par une fente d'aspiration (12) qui est disposée dans une direction orthogonale à la direction de déplacement de ladite portion rectiligne (9).Device according to Claim 6, characterized in that the suction means consist of a suction box (6) the suction face of which, located opposite the rectilinear portion (9) for receiving the web, consists of two converging inclined planes (11 a , 11 b ) and separated by a suction slot (12) which is arranged in a direction orthogonal to the direction of movement of said rectilinear portion (9). Dispositif selon l'une des revendications 1 à 7 caractérisé en ce que le cylindre détacheur (4) est équipé sur sa périphérie d'une garniture isocèle (8) ou comporte sur toute sa périphérie des cannelures longitudinales, de telle sorte qu'il permet une reprise du voile (2) avec une adhérence moindre que celle du voile sur le dernier cylindre travailleur (1).Device according to one of Claims 1 to 7, characterized in that the detaching cylinder (4) is equipped on its periphery with an isosceles lining (8) or has longitudinal grooves over its entire periphery, so that it allows a recovery of the veil (2) with less grip than that of the veil on the last working cylinder (1). Carde équipée en sortie d'au moins deux dispositifs (20,21) qui sont visés à l'une des revendications 1 à 8 et qui sont agencés pour permettre la superposition des deux voiles issus de leurs deux cylindres détacheurs (22).Card fitted at the outlet with at least two devices (20,21) which are referred to in one of claims 1 to 8 and which are arranged to allow the superimposition of the two sails from their two detaching cylinders (22). Carde selon la revendication 9 caractérisée en ce qu'elle est équipée en sortie d'un unique transporteur à bande qui est commun aux deux dispositifs.Card according to claim 9 characterized in that it is equipped at the outlet with a single conveyor belt which is common to the two devices. Carde selon la revendication 9 caractérisée en ce que chaque dispositif possédant son propre transporteur à bande, un premier transporteur (26) achemine un premier voile jusqu'à la bande du second transporteur (27), en sorte de positionner ce premier voile au-dessus et dans le prolongement de la bande de ce second transporteur (27), et en ce que le second transporteur (27) est équipé, au niveau de la zone de jonction (28) entre les deux bandes des transporteurs, de moyens d'aspiration (29) qui permettent de poser le premier voile au-dessus du voile véhiculé par le second transporteur (27).Card according to claim 9 characterized in that each device having its own conveyor belt, a first conveyor (26) routes a first web to the web of the second conveyor (27), so as to position this first web above and in the extension of the strip of this second conveyor (27), and in that the second conveyor (27) is equipped, at the junction zone (28) between the two conveyor belts, with suction means (29) which allow the first veil to be placed above the sail carried by the second transporter (27).
EP94490055A 1994-09-30 1994-11-16 Device for taking off and transporting, with a high speed, a fibre web at the exit of a carding machine Expired - Lifetime EP0704561B2 (en)

Applications Claiming Priority (2)

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FR9411920 1994-09-30
FR9411920A FR2725216B1 (en) 1994-09-30 1994-09-30 DEVICE FOR DETACHING AND TRANSPORTING AT HIGH SPEED A FIBROUS VEIL LEAVING A CARD

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EP0704561A1 true EP0704561A1 (en) 1996-04-03
EP0704561B1 EP0704561B1 (en) 1998-04-15
EP0704561B2 EP0704561B2 (en) 2004-07-28

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US (1) US5584101A (en)
EP (1) EP0704561B2 (en)
JP (1) JPH08209461A (en)
AT (1) ATE165125T1 (en)
DE (2) DE704561T1 (en)
DK (1) DK0704561T4 (en)
FR (1) FR2725216B1 (en)

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WO1998004765A1 (en) * 1996-07-30 1998-02-05 Maschinenfabrik Rieter Ag Fibre sorting facility
EP0950733A1 (en) * 1998-04-17 1999-10-20 Thibeau Method and installation for the forming of an airlay fiber web
EP0962561A1 (en) * 1998-06-05 1999-12-08 FONDERIE OFFICINE RIUNITE F.O.R. ING. GRAZIANO DI L. GRAZIANO & C. S.a.s. A carding machine with a doffer roller
EP1589132A1 (en) * 2004-04-22 2005-10-26 Thibeau Carding machine with a rotating suction transfer device
EP1672110A1 (en) 2004-12-16 2006-06-21 Asselin-Thibeau Method and device for the transport of carded or air-laid nonwovens
EP0817875B2 (en) † 1995-03-31 2006-08-16 Spinnbau GmbH Apparatus and device for the production of nonwovens
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EP1295973B1 (en) * 2001-09-25 2005-12-07 Spinnbau GmbH Apparatus and method for transporting a textile sheet
FR2830263B1 (en) * 2001-10-03 2004-08-06 Thibeau METHOD AND INSTALLATION FOR THE PRODUCTION OF A CONDENSED NONWOVEN, AND DEVICE FOR CONDENSING A NONWOVEN
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US9522111B2 (en) 2011-12-16 2016-12-20 Colgate-Palmolive Company Color changing compositions

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EP0704561B2 (en) 2004-07-28
DK0704561T3 (en) 1998-06-02
ATE165125T1 (en) 1998-05-15
JPH08209461A (en) 1996-08-13
DE69409648T3 (en) 2005-02-17
DE704561T1 (en) 1997-06-05
EP0704561B1 (en) 1998-04-15
FR2725216B1 (en) 1996-12-20
US5584101A (en) 1996-12-17
DE69409648T2 (en) 1998-08-20
DK0704561T4 (en) 2004-09-06
FR2725216A1 (en) 1996-04-05
DE69409648D1 (en) 1998-05-20

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