EP0704561B1 - 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
EP0704561B1
EP0704561B1 EP19940490055 EP94490055A EP0704561B1 EP 0704561 B1 EP0704561 B1 EP 0704561B1 EP 19940490055 EP19940490055 EP 19940490055 EP 94490055 A EP94490055 A EP 94490055A EP 0704561 B1 EP0704561 B1 EP 0704561B1
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EP
European Patent Office
Prior art keywords
web
suction
cylinder
veil
rectilinear
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Expired - Lifetime
Application number
EP19940490055
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German (de)
French (fr)
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EP0704561A1 (en
EP0704561B2 (en
Inventor
Marc Brabant
Jean-Louis Dupont
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Thibeau
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Thibeau
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Family has litigation
Priority to FR9411920 priority Critical
Priority to FR9411920A priority patent/FR2725216B1/en
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Publication of EP0704561B2 publication Critical patent/EP0704561B2/en
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    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70Non-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
    • D04H1/74Non-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)
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01GPRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02Carding machines
    • D01G15/12Details
    • D01G15/46Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/465Doffing arrangements for removing fibres using, or cooperating with, pneumatic means
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70Non-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

Description

The present invention relates to the recovery and transport of a fibrous veil at the outlet of carding. Its main purpose is a device that detaches and transport at high speed a fibrous web leaving the last cylinder worker with a card, without causing any significant change in the structure of the veil and in particular of stretching this veil.

Currently, to detach a fibrous veil at the end of the card, it is known to use a small diameter detaching cylinder, which is adjacent to the last working cylinder of the card, and which is rotated at the same speed and in the same direction as the last working cylinder. The last cylinder worker will be for example a painter, 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 together, so as to increase the cohesion of this veil in the direction transverse to the working direction of the card.

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 attachment of the fibrous web over the entire periphery of the detaching cylinder, with however less adhesion than that of the veil on the last cylinder worker. It could for example be a cylinder equipped with an isosceles lining or of a cylinder having longitudinal grooves over its entire periphery.

The second known type of detaching cylinder consists of a cylinder perforated, with a fixed suction sector opposite the last cylinder worker. Such a detaching cylinder has for example been described in the patent French N ° 1,500,746. When the fibrous veil reaches the sector level suction, it is placed on the periphery of the detaching cylinder in rotation. Beyond this suction sector, the fibrous veil 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 peripheral suction flow superficial which tends to maintain the fibrous veil on this cylinder, which translated, in the absence of additional means of recovery of the veil, by a winding of the web at the periphery of the suction cylinder.

Compared to the suction detaching cylinder, the first type mentioned above of detaching cylinder has the main advantage of allowing more recovery reliable fibrous web at the periphery of the working cylinder. However, the the counterpart of this reliability results in an adhesion of the fibrous veil to the periphery of the detaching cylinder which is stronger than that of the fibrous web at the periphery of the suction detaching cylinder, beyond the suction sector.

With the two known types of detaching cylinders, it is necessary to use additional means of recovery of the fibrous veil, in order to route this veil to its next processing operation; it will be by example of a fibrous veil consolidation operation, by passing between two calenders.

So far, to resume this veil at the periphery of the cylinder detacher, it is passed between two rotating cylinders, or between the conveyor belt and a rotating cylinder positioned just above the carrier. With such means, the recovery of the veil is accompanied necessarily a stretching of the veil in the direction of its length. The veil fibrous at the end of the card has very low cohesion, with resistance very low at a transverse tensile force. Therefore, when we provoke stretching the veil lengthwise, the cohesion of this veil. As a result, beyond a maximum working speed of the carding machine, which is currently around 120 m / minute, the stretching of the web becomes too large and a poor quality veil is obtained appearance, its regularity of weight and the isotropy of its mechanical properties.

It is proposed in European patent application EP-A-484,812 to resume a fibrous veil at the end of the card by receiving this veil on a conveyor belt passing near a detaching cylinder. However with this solution, it is not possible to train the conveyor belt to a high speed and in particular at a speed greater than 120m / minute. Indeed, when the speed increases, the veil tends to remain rolled up at the periphery of the last detaching cylinder. Therefore, when the speeds become too important, and in the event that the conveyor belt is trained to same speed as the last detaching cylinder, we observe in the best of If the veil floats, it could damage it or cause lines of transverse folds in the veil, and in the worst case a winding of the veil on the periphery of the detaching cylinder.

For this reason with a detaching device of the type of document EP-A-484 812, we are forced to work with relatively low speeds and less than 120m / min, and what's more, we prefer to avoid any risk of fluttering of the veil during its transfer, causing the conveyor belt to a speed very significantly higher than that of the detaching cylinders so to stretch the veil lengthwise during its transfer, which is however detrimental to the cohesion of the veil.

It has also already been proposed in US-A-3,787,930 to take up the fibrous veil at the periphery of the detaching cylinder by plating it with suction on the surface of the conveyor belt. The system described in this patent therefore implements a detaching cylinder, which in this case is a comb cylinder, suction means and a conveyor belt which is interposed between the suction means and the detaching cylinder, and the strip of which is breathable.

The goal of implementing this system is to redirect randomly the fibers of the veil during its transfer by aspiration of the detaching cylinder on the conveyor belt, and thereby obtain out of card a veil whose fibers are blurred. For this purpose, the suction is carried out in the area where the fibrous web is taken up by the detaching cylinder, area in which the veil is turned back. So the suction means create a zone of turbulence in the shrinkage zone of the web, which allows the fibers of said veil to be scrambled. In this system, it is necessary to pass the conveyor belt through the web recovery area at the outlet of carded by the detaching cylinder. Therefore, the portion of the band of transport used to receive the veil cannot be a straight portion and is necessarily a curved portion. In this case it is more particularly of a portion of cylinder. In addition, in the system of US-A-3787930, in order to obtain a consolidation of the veil, the peripheral speed of the detaching cylinder is preferably chosen to be at least 20% higher than the linear speed of the conveyor belt.

The purpose of the present invention is to provide a device which, unlike the aforementioned devices of the prior art, makes it possible to detach and transport a fibrous veil out of the card, without causing modification in the structure of the web, and in particular without causing stretching of this veil, and thereby accelerate the rate of work of the card without harming the quality of the fibrous veil produced.

This object is perfectly achieved by the device which is the subject of the claim 1, the characteristics of the preamble of which are known from the European patent application EP-A-484812, and which is characterized in that it puts using suction means, in that the conveyor belt is breathable, and is interposed between the suction means and the cylinder detacher, and in that the suction means are capable of creating a zone of vacuum between the detaching cylinder and the straight portion of the strip, at level of their line of quasi-tangency, so that by driving the strip of the conveyor with substantially the same linear speed as the speed device of the detaching cylinder the fibrous web can detach from the cylinder detacher at the level of the quasi-tangency line and land on the portion straight line of the conveyor belt at high speed, without undergoing any modification notable in its structure.

In the device of the invention, when the veil arrives in the area of vacuum created by the suction means between the detaching cylinder and the straight portion of the conveyor belt used to receive the web, under the combined effects of gravity and aspiration, it detaches from the periphery of the detaching cylinder and is posed as it is on the surface and in the extension of the conveyor belt. This being driven at substantially the same speed linear than the peripheral speed of the detaching cylinder, the web does not undergo lengthwise.

In the device of the invention, the distance separating the straight portion of reception of the web and the periphery of the detaching cylinder must be sufficiently weak, so that during its transfer, the veil does not undergo floating likely to damage it or cause transverse fold lines in the veil. It is therefore preferable that this distance is equal or slightly greater than the thickness of the veil. However, this distance value is not limitation of the invention, since it has been possible in practice to regulate this distance up to a value of up to a hundred times the thickness of the web product, without observing deterioration of the veil, which is visible to the naked eye. In in addition to the lower limit of this distance, it was possible to test values less than the thickness of the uncompressed web, without this changes the appearance of the veil. In this case, the suction flow created across the conveyor belt should be enough to compress the veil sufficiently in the region of the detaching cylinder, so that the veil does not either more in contact with the periphery of the detaching cylinder, once placed on the straight portion of the conveyor belt.

The transporter of the device of the invention can be used to route the veil from the last carding cylinder to a treatment of this veil such as for example the rollers of a grille. In the framework of the invention this conveyor belt can also be an integral part a machine arranged at the card outlet. More specifically, this transporter could constitute the entrance apron of a machine, such as for example a spreader lapper.

Advantageously, the distance separating the straight receiving portion of the web and the periphery of the detaching cylinder will be adjustable so that be adapted to different wall thicknesses.

The suction flow which is created through the straight portion of the strip transport must be powerful enough to compensate for the adhesion of the veil fibrous at the periphery of the detaching cylinder. This power depends on several parameters, among which the grammage of the fibrous veil produced, the inclination of the rectilinear portion of reception of the veil with respect to the horizontal, and the type of detacher cylinder used.

Preferably, the vacuum zone created by the suction means has the following characteristics. It extends at least over the entire width of the veil, which avoids any risk of folding of the longitudinal edges of the veil 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 veil, or upstream of this line of quasi-tangency, and extends downstream of the line of quasi-tangency over at least one radius of the cylinder detacher. 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 sail. The high speed rotation of the detaching cylinder created downstream of the line of quasi-tangency between this cylinder and the rectilinear portion for receiving the web, a suction flow which tends to keep the fibrous veil pressed against the periphery of the detaching cylinder. Therefore, if we position the start of the depression zone downstream of this line of quasi-tangency, the fibrous veil will have tendency, beyond this line of quasi-tangency, to continue its winding on the periphery of the detaching cylinder, and 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 carried out beyond this line of quasi-tangency, risk of causing the web to float between the detaching cylinder and the strip carrier, which is detrimental to the cohesion of this veil. The effects of turbulence created in particular by the rotation of the detaching cylinder downstream of the line of quasi-tangency are mainly felt in the space between the periphery of the detaching cylinder and the rectilinear portion for receiving the web, in downstream of the quasi-tangency line. For this reason, in order to avoid any risk of lifting of the veil on the surface of the conveyor belt, it is preferable to extend the depression zone from the quasi-tangency line, and on at least a distance equivalent to the radius of the detaching cylinder.

Regarding the beginning of the depression zone, it is imperative, when this is located upstream of the line of quasi-tangency, that the suction flow cannot disturb the recovery of the veil 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 line of quasi-tangency. It is also possible to interpose between the conveyor belt and the area where the web is taken up by the detaching cylinder, a deflector which prevents the suction flow from reaching the web in the junction zone between the last working carding cylinder and the cylinder detacher. However, in order to avoid any risk of disruption of the recovery of the sail by the detaching cylinder on the working cylinder, it is preferable that the distance between the line of quasi-tangency, and the beginning of the depression zone located upstream of this line, ie less than the radius of the detaching cylinder.

Advantageously, the vacuum zone created by the suction means is not constant, and depression increases continuously or almost continuously to a maximum of the depression zone, then decreases continuously until the end of the depression zone. In this case, the maximum of the area of depression is located at or near the line of quasi-tangency line, being distant from it by a maximum radius of the detaching cylinder.

To obtain this zone of non-constant depression, we will use preferably a suction box whose suction face, located opposite the rectilinear portion of the portion of the web, consists of two inclined planes converging and separated by a suction slot, which is arranged substantially in a direction orthogonal to the direction of movement of said portion straight. The suction slot corresponds to the maximum of the vacuum zone, inclined planes to decrease this depression, with a gradient depending on the inclination of each plane.

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 fitted 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.

In a first particular embodiment, the card is equipped with exit from a single conveyor belt which is common to both devices.

In a second particular embodiment, each device having its own belt conveyor, a first conveyor conveys a first veil up to the belt of the second conveyor, so as to position this first veil above and in the extension of the strip of this second carrier ; the second transporter is equipped, at the junction area between the two strips, suction means which allow the first veil on the veil carried by the second transporter.

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.

FIG. 1 shows the last working cylinder 1 of a card, and a device 3 making it possible to detach the fibrous web 2 which is wound at the periphery of the worker cylinder 1, and subsequently transport this veil to great 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 worker cylinder 1, and is driven in the same direction of rotation and with the same speed around its axis of rotation 7. The periphery of this cylinder is fitted with a gasket 8 with isosceles points. The conveyor 5 has a band with multiple perforations, and which is therefore permeable to air. Portion 9 of this strip shown in Figure 1 is rectilinear, and passes near the periphery of the detaching cylinder 4, in a direction orthogonal to the axis of rotation 7 of this detaching cylinder. She is also trained with the same linear speed than the peripheral speed of the detaching cylinder 4.

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.

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.

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 .

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 points of the seal 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 case mainly present at 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 the line of quasi-tangency T by arrows F.

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 in the context of the invention, to use a suction cylinder perforated as a detaching cylinder. The advantage of using a detaching cylinder isosceles lining or similar, is to increase the reliability of the recovery of the veil by this cylinder. Note that a comparable degree of reliability would be obtained with a detaching cylinder having longitudinal grooves over its entire periphery.

When the web 2 arrives at the beginning 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 at 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 of their line T of quasi-tangency, a zone of turbulence which tends to peel off the web 2 from the surface of the strip 9. It is for this reason that it is preferable for the zone of depression to extend until the effects of this zone of turbulence are no longer felt. , and that it is preferable that the distance d 'which separates the end of the depression zone 10 from the line of quasi-tangency T is in practice at least equal to the radius r of the detaching cylinder 4.

Beyond this zone of turbulence, the fibrous veil is entrained without sliding on the surface of the conveyor belt 9, by the thin layer of air which is generated by the displacement of this strip. The speed of the veil 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 veil does not undergo any stretching. It should be noted that in practice it is possible speed tolerance of up to 2% between speed linear of the conveyor and the peripheral speed of the detaching cylinder, without this variation does not cause a modification of the structure of the veil which is detrimental to the quality and cohesion of the veil produced.

In the particular example of Figure 1, the suction box 6 has a suction face formed 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.

We understand in light of the description that has been made of the transfer of fibrous web from the detaching cylinder 4 to the straight portion 9 of the conveyor 5, that the vacuum zone 10 must at least compensate for the adhesion of the fibrous web on the periphery of the detaching cylinder 4, as well as the effects of turbulence created downstream of the quasi-tangency line T. The characteristics of this vacuum zone depends mainly on the type of detaching cylinder used, the grammage of the fibrous web produced and the angle of inclination α of the straight portion 9.

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 0 and 50mm. By implementing this precise example of implementation, it was possible to detach and transport at the outlet of the card a veil having a basis weight between 5g / m 2 and 100g / m 2 , 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 10 g / m 2 was of the order of 5 mm.

It is of course possible in the context of the invention to replace the suction box 6 which has been described by any type of suitable suction means. More particularly, it is possible to use a suction box creating a vacuum zone with vacuum gradients which are different upstream or downstream from the suction slot 12, which results in a different inclination of the two. convergent planes 11 a , 11 b .

When starting the card, as long as it has not reached its speed normal operation, the fibrous veil produced has a reduced thickness and lower grammage. Therefore, in order to avoid any risk of winding the fibrous web at the periphery of the detaching cylinder 4, at the start of the card, 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 that 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 veils, and their superposition. In these figures, the main drum of the carde is referenced 13. The first upper exit 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 exit routes 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 cylinder comb 19 for the lower track correspond to the working cylinder 1 of the Figure 1 device.

In the two examples of Figures 2A and 2B, a single belt conveyor for both exit routes. In the example in Figure 2A, this conveyor belt has a straight 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 veil, coming from the lower track, is conveyed by this portion straight 24 to the entrance of the vacuum zone created by the box suction 23 of the device 20 of the upper channel. In this area of depression, the second fibrous veil from the upper track is superimposed on the first fibrous web, the suction flow created by the suction box allowing both to maintain the first fibrous veil from the lower route on the surface of the straight portion 24 and detach the second fibrous web from the upper track to superimpose it on the first fibrous veil.

In the example of Figure 2B, the detaching cylinder 22 and the 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 variant of advantage has the advantage of avoiding the risks of separation of the fibrous veil when changing the direction of the carrier. Indeed, when the first veil fibrous from the lower track arrives at this change of direction, it is maintained on the surface of the carrier due to the presence of the box suction 23 just downstream of this change of direction.

In the third example of FIG. 2C, each device 20, 21 has its own belt conveyor 26, 27. The detaching cylinder 22 of each device 20, 21 is located substantially vertically respectively of the condenser 17 and the doffer 19. The conveyor 27 is horizontal. The carrier 26 is inclined downward and allows the routing of the fibrous web coming from the track above the surface and in line with the transporter 27. The superposition of the two fibrous webs coming from the card is therefore carried out at the level of the junction zone 28 between the two conveyors 26 and 27. At this level junction zone 28 are also provided with additional suction means whose function is on the one hand to maintain the first fibrous veil coming from the way less than the surface of the conveyor 27 during the superposition of the two sails and on the other hand to place, on this conveyor 27, the fibrous web conveyed by the carrier 26.

Claims (12)

  1. A device for removing and transporting a fiber web at the outlet of a carder, the device being of the type comprising a takeoff cylinder (4) which ensures the removal of the web on its periphery at the outlet of a carder, and a conveyor belt (5) which possesses a rectilinear portion (9) for receiving the web (2), which portion passes close to the takeoff cylinder (4) and in a direction that is orthogonal to the axis of rotation (7) of the takeoff cylinder, characterised in that it comprises suction means, in that the conveyor belt (5) is permeable to air, and is interposed between the suction means and the takeoff cylinder (4), and in that the suction means are capable of creating a suction zone between the takeoff cylinder (4) and the rectilinear portion (9) of the belt at the almost-tangential line (T) thereof, such that by driving the conveyor belt (5) with a linear speed that is substantially equal to the peripheral speed of the takeoff cylinder (4), the fiber web may be removed from the takeoff cylinder at the almost-tangential line (T) and be placed on the rectilinear portion (9) of the conveyor belt at high speed without being subjected to any significant alteration of its structure.
  2. A device according to claim 1, characterised in that the distance between the periphery of the takeoff cylinder (4) and the rectilinear web-receiving portion (9) is adjustable.
  3. A device according to one of claims 1 or 2, characterised in that the distance e between the rectilinear web-receiving portion (9) and the periphery of the takeoff cylinder (4) is preferably equal to or slightly greater than the thickness ε of the web.
  4. A device according to claim 1, characterised in that the suction means create a suction zone (10) between the takeoff cylinder (4) and the rectilinear web-receiving portion (9) in which the suction zone extends over at least the entire width of the web (2), begins at the almost-tangential line T between the takeoff cylinder (4) and the rectilinear web-receiving portion (9) or upstream from said almost-tangential line T relative to the displacement direction D of the rectilinear web-receiving portion (9), and extends downstream from the almost-tangential line T over at least the radius r of the takeoff cylinder.
  5. A device according to claim 4, characterised in that the distance d between the almost-tangential line T and the beginning of the suction zone is less than the radius r of the takeoff cylinder (4).
  6. A device according to claim 4 or 5, characterised in that the suction means are designed so as to create a zone (10) of non-constant suction in which the amount of suction increases continuously or substantially continuously from the beginning of the zone up to a maximum, and then deceases continuously or substantially continuously down to the end of the suction zone.
  7. A device according to claim 6, characterised in that the suction means comprise a suction box (6) whose suction face that is situated facing the rectilinear web-receiving portion (9) is constituted by two converging inclined planes (11a, 11b) that are separated from each other by a suction slot (12) which extends orthogonally to the displacement direction of said rectilinear portion (9).
  8. A device according to one of claims 1 to 7, characterised in that the takeoff cylinder (4) is fitted on its periphery with an isosceles cover (8) or includes longitudinal fluting at its periphery, whereby it enables the web (2) to be removed while using adhesion that is less than that of the web on the last working cylinder (1).
  9. A carder fitted at its outlet with one device according to one of claims 1 to 8.
  10. A carder according to claim 9, characterised in that it is fitted at its outlet with at least two devices (20, 21) referred to in one of claims 1 to 8, and organized to enable the two webs coming from their two takeoff cylinders (22) to be superposed.
  11. A carder according to claim 10, characterised in that it is fitted at its outlet with a single conveyor belt common to both devices.
  12. A carder according to claim 10, characterised in that each device possesses its own conveyor belt, namely a first conveyor (26) that conveys a first web to the belt of the second conveyor (27) so as to place the first web over and in line with the belt of the second conveyor (27), and in that the second conveyor (27) is fitted in the junction zone (28) between the two belts of the conveyors with suction means (29) enabling the first web to be placed on the web conveyed by the second conveyor (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)

Priority Applications (2)

Application Number Priority Date Filing Date Title
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

Publications (3)

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

Family

ID=9467603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94490055A Expired - Lifetime EP0704561B2 (en) 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

Country Status (7)

Country Link
US (1) US5584101A (en)
EP (1) EP0704561B2 (en)
JP (1) JPH08209461A (en)
AT (1) AT165125T (en)
DE (2) DE69409648T3 (en)
DK (1) DK0704561T4 (en)
FR (1) FR2725216B1 (en)

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US6195842B1 (en) * 1995-12-08 2001-03-06 E. I. Du Pont De Nemours And Company Feeding carded fiber to an airlay
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US6061876A (en) * 1997-06-11 2000-05-16 John D. Hollingsworth On Wheels, Inc. Textile recycling machine
FR2777575B1 (en) 1998-04-17 2000-07-07 Thibeau Method and installation for forming a fibrous veil by air
ITTO980486A1 (en) * 1998-06-05 1999-12-06 Fonderie Officine Riunite F O Carda with doffer cylinder.
US5930871A (en) * 1998-07-09 1999-08-03 John D. Hollingsworth On Wheels, Inc. Air doffing system for a textile processing machine
DE19837182B4 (en) * 1998-08-17 2007-01-25 Stahlecker, Fritz Conveyor belt for transporting a fiber strand to be compacted
DE50108324D1 (en) * 2001-09-25 2006-01-12 Spinnbau Gmbh Plant and method for transporting textile fabrics
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
DE10234803A1 (en) * 2002-07-31 2004-02-12 Erko Textilmaschinen Gmbh Device for removing a nonwoven fabric from a card, with a suction roller
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Also Published As

Publication number Publication date
FR2725216A1 (en) 1996-04-05
DK704561T3 (en)
DE69409648D1 (en) 1998-05-20
DE704561T1 (en) 1997-06-05
DK704561T4 (en)
DK0704561T4 (en) 2004-09-06
US5584101A (en) 1996-12-17
AT165125T (en) 1998-05-15
FR2725216B1 (en) 1996-12-20
EP0704561A1 (en) 1996-04-03
DE69409648T2 (en) 1998-08-20
DK0704561T3 (en) 1998-06-02
DE69409648T3 (en) 2005-02-17
EP0704561B2 (en) 2004-07-28
JPH08209461A (en) 1996-08-13

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