ES2371717T3 - FIBER FEEDING DEVICE. - Google Patents

Abstract

Fiber delivery device comprising fiber feeding means, feeding fiber material via a carding or opening roll to fiber distribution means characterized in that the fiber distribution means are perpendicular to the collection means divided in a plurality of small fiber distribution means, which are build such that a continuous flow of fiber material can be directed either in the direction of the collection means or in a direction away from the collection means.

Description

Fiber feeding device

The invention relates to a feeding device for advancing fiber material towards a collection device, such as a rotating drum, a collecting belt or product molds. 5

In the automotive industry, fiber felt materials are used in a wide range of products for sound insulation, for example in laying, roof lining and particularly in the floor area. These products are formed and cut to fit the space. In addition, certain areas of the product with have a greater amount of material to obtain greater sound insulation. For example, at the bottom of the

10 dashboard additional material is used to reduce vehicle engine noise. The added material is also needed in certain areas of the lower carpet or floors to improve the acoustic insulation locally. Felt products can be combined with a heavy layered material to form an elastic mass system or with a layer resistant to air flow to form an acoustic absorbent system.

15 These products need to have fiber-free areas, for example for fastening means, or to pass around devices in a vehicle and have to follow a certain contour, such as the door or the floor to be placed exactly in the vehicle. Therefore, the products are cut after the step of stiffening them. The cuts or residues, which remain after cutting, are of mixed material already consolidated by a heating step. Most of these materials are therefore difficult to recycle. This is a real problem in the

20 modern car industry. Fiber felt products are usually produced from previously formed fiber mats containing binder fibers, which are pressed into a hot mold and cut to obtain the desired shape and stiffness. A disadvantage of this method is that the weight of the product depends on the fiber mat

25 and is therefore limited. The areas with greater weight can be achieved only by additional supply of the material by hand. This is time consuming and very expensive. In addition, because the fiber mats are supplied as a roll product or as previously cut mats, the production process is linked to producing a large amount of waste material. Another disadvantage of using previously formed fiber mats is that they tear or break easily when pressed into profiled molds.

30 extremes Schlichter, in the article "Alternative Anwendungen fUr Flockenspeiser" in Melliand Textilberichte (7-8 / 2001) suggested using a sheet forming machine that is capable of producing a profiled sheet, in which the profile is located in the direction of the width of the formed band. The sheet is collected on a mobile collection belt and

Therefore, profiling is only evident in the width and not in the length of the formed band. To obtain such a width profile, the feed tray comprises a plurality of small feed trays that are adjustable separately in their distance from pressure space to obtain a height profile in the formed sheet. The disadvantage of this system is that it can only be adjusted before production and not during production. In addition, the same only allows a profile in the width of the sheet, giving rise to a profile listed in the

40 final laminate produced. It is not possible to obtain a different weight in a local area or to obtain material-free zones. Another method of production is to directly blow fibers into a mold. US3697208 6 US20070007695 describes a method in which the mold is completely filled with the fibrous material. Too

45 the disadvantage here is that the amount of the different fiber weight locally can only be adjusted by the manufacture of the molds and by the way in which the molds are pressed together to obtain the final product. It is not possible to obtain open areas or separation spaces in the product. EP 770154 discloses a system of at least one filling hose located above the

50 mold for loading molds with fiber material. The mold is located at the top of an air vacuum duct to confine the fibers in the mold. Fiber clusters are fed to each hose. Air tubes allow an air flow to be used to drive the clusters out of the hose or to the next section with a door. To obtain zones of different densities in a molded product,

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You can use a programmable positioning device to handle the mold fill hose. It can then be placed in different areas of the mold and the amount of fibers can be regulated over time in each zone. This can also be done with more than one hose per mold. The disadvantage of this system is an expensive and complex machine that does not leave much space for a flexible process.

It is therefore an object of the invention to obtain a fiber supply device that is capable of supplying fiber material in the precise amount and area. The fiber delivery device can be used to produce nonwoven web or sheets, to fill molds or to produce nonwoven fibrous product with a three-dimensional shape.

The object is achieved by the fiber delivery device according to claim 1, particularly by means of the deflection of the fiber flow in the direction of the collection device or in the direction of a recycling device, the fibers not being placed in block or condensed in any state before final collection in the collection device or collector. In addition, dividing the width of the machine into small sectors each of which has means to direct the flow of fibers either in the direction of the fiber collecting device for the final producer or in the direction of a recycling device for later use. again of the material "discarded", it is possible to supply fiber material in specific areas of the final product, in specified weight or even to omit certain areas of the product. The product is not fixed to a mold, but can be in the form of a sheet, a three-dimensional mat or product. And it can be either a band of continuous fiber material with a three-dimensional structure or they can be discrete products.

A fiber delivery device according to the invention comprises fiber feeding means, fiber feeding material through a carding roller or opening to fiber distribution means, whereby the fiber distribution means are perpendicular to the collection means divided into a plurality of small fiber distribution means, which are constructed such that a continuous flow of fiber material can be directed either in the direction of the collection means or in a direction that moves away from the means of collection.

The small means of fiber distribution can be either:

-

a movable ejector nozzle, whereby the ejector nozzle 230a extends fibers over the device

pick-up 208 in a first position and extend fibers out of pick-up device 208a in the

second position, or

-

a small downpipe separated from the smaller downstream ducts by a wall,

the small downpipe containing a pivoting fin located in such a way that it can direct the

fiber flow to the collection device or out of the collection device.

The fibers directed out of the collection device can be directed to a recycling device, preferably in the form of a conduit. The collection means may be a mobile perforated tape, or a mobile perforated plate or a mobile perforated mold or a mobile perforated drum.

The vacuum means may be located below the line collection means with the position in which the fiber material will be located by the distribution means. In case the small fiber distribution means are small downpipes, they can contain at least 2 outlets, one directed towards the collection device and the other outlet directed towards the recycle duct and the pivot fin is located in such a way. so that at least one of the outputs can be closed. Or the small downpipe may contain at least 2 outlets, one outlet directed towards the collection device and the other outlet directed towards the recycling duct and the pivot flap is positioned such that after opening one outlet the other exit closes simultaneously. Each of the small fiber distribution means can have pneumatic attenuation means and each can be individually controlled by a PLC.

A first device according to the invention contains a first main down duct with means for feeding fiber material to a second down duct feeding section. The second section of downpipe feed is divided into its width into sections. These sections are separated with

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walls to obtain a plurality of small downpipes. The feeding means are located just above these small downpipes and the material flow is automatically divided into smaller fiber flows due to these separation walls. Each of these small downpipes contains two channels, one directed towards the fiber collection device and the other directed towards a recycling device. At the junction of the two channels, where the two channels separate to follow different directions, a pivoting flap is located in such a way that it can close at least one of the channels. This pivoting fin can guide the flow of fibers either in the direction of the collection device or out of the collection device in the direction of the recycling device. Instead of channels, it is also possible to have at least 2 outputs.

The recycling device can be precisely a large bucket or box for discarding the fiber material, but it can also be a duct system with a fan, the duct system being preferably connected to the first main down duct. Although it could be an option a simple system of opening / closing the small downpipes with only one outlet that can be opened or closed with a valve. The system with at least two exits and a pivoting fin is more preferred, having the advantage that at no time during the process the fiber material is standing and is unnecessarily compressed. This has the additional advantage that the fins cannot be blocked by fiber plugs. Therefore, a more uniform density distribution of the material flow over the entire width of the product is ensured.

In order to control the direction of the flow of fiber material in each of the small downcomers, the pivoting fins are controlled. The pivoting movement can be carried out by hydraulic or pneumatic means known in the art. These means for pivoting movement can be controlled and regulated. Preferably, a computer control system is connected to each of the pivoting fins, to make it possible to control the position of the fins in the time regulation when the position is to be changed. By controlling each fin separately, it is possible to control the amount of fiber material and the position of the fiber material in relation to the fiber product or mat.

Due to the plurality of small downpipes, the width of the collection device is divided into small areas, the length and width of these areas being dependent on the width and length of the small downpipes. The total number of zones in the width direction, parallel to the main downpipe, is the same as the total number of small downpipes.

By controlling the pivoting fins and therefore the direction of the fiber flow, it is possible to feed through each small down conduit "non-fibers". or a certain amount of fiber material depending on the time in which the fiber flow is directed towards the collection device and the fiber flow rate of the fiber feeding means. The fiber flow rate is defined by the feeding means that supply the fiber material to all the small downspouts at the same time. Thus, for example, the collection device is a flat perforated tape that moves continuously and all the fins are adjusted such that the flow of fibers has the direction of this tape, whereby the result would be a normal sheet or band non-woven with a uniform distribution of fibers in the width and length of the band (the length is in the direction of the moving belt).

It would also be possible to move the tape discontinuously in a step-by-step manner. The step can copy the length of the small downpipes. If the pivoting fins are then controlled to direct the flow of fibers to the collection device in a discontinuous flow, then that can be considered as formed in portions of the fiber material. In the case of a mobile tape this would mean that it is possible to place discrete portions of fiber material in discrete areas on the tape. Depending on the movement in the tape's step-by-step mode, these discrete potions are separated or overlap. To create an area without fiber material, it is only necessary to direct the fiber material for a certain period of time out of the collection device.

Using this it is possible to obtain areas without fiber material, the fiber flow is directed out of the collection device, or a defined amount of material, regulating in time the fiber flow directed to the collection device in relation to the movement of the device of collection below the fiber supply device.

A second alternative device according to the invention may have, instead of a small static descent duct with a pivoting fin each to direct the fiber material to or from the collection device, a plurality of ejector nozzles transversely distributed with with respect to the direction of travel of the collection device, in which each ejector nozzle is movable between a first position

5 in which said nozzle extends fibers over said collection device and a second position in which said nozzle extends fibers out of said collection device. In a particular embodiment, the device for producing a nonwoven fiber web comprises a recycling device for recycling fibers extended by the ejector nozzles that are in the second position.

The device for producing a band of nonwoven fibers advantageously comprises a new treatment device for returning the recycled fibers by the recycling device to the fiber feeding device.

The invention also provides a process for producing a web of nonwoven fibers, comprising:

15 - a step of moving a collection device beyond a fiber feeding device comprising a plurality of ejector nozzles distributed transversely with respect to the direction of travel of the collection device;

20 -a step of continuously extending fibers through said plurality of ejector nozzles; Y

-

for each ejector nozzle, movement steps between a first position in which the fibers are extended on said collection device and a second position in which the fibers are not extended on said collection device, and vice versa.

Advantageously, each step of the movement between the first position and the second position is followed by a fiber recycling step.

Advantageously, the recycled fibers in the fiber recycling step undergo a transport step to the fiber feeding device.

The invention also provides a band of nonwoven fibers produced by a production process according to one of the preceding variants.

Figure 1 is a schematic side view of the fiber distribution device according to the invention following the first alternative;

Figure 2 is an A-A 'front view of the fiber distribution device according to the invention;

Figure 3 is an alternative solution for the placement of the pivot fin;

Figure 4 shows an example of a band of nonwoven fibers according to the invention;

Figure 5 is a schematic view of a device for producing a band of nonwoven fibers according to the invention following the second alternative;

Figure 6 is a schematic drawing of the device for producing a band of nonwoven fibers according to the invention following the second alternative;

50 Figure 7 is a schematic diagram for the production of a three-dimensional complex product.

The fiber distribution device will now be explained with the help of the front and side view of Figures 1 and 2 following the first alternative.

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The fiber distribution device according to the invention comprises a main down conduit (1) for storing the fiber material. This downcomer can have the usual devices for obtaining a mass of homogeneous fibers, as is known in the art, such as a rear wall, which moves back and forth, or a perforated rear wall with an aeration system. (not shown). The homogeneous fiber mass is then fed to a carding roller (3) or opening by two feed rollers (2). Other feeding means can also be used to transport fiber material, known in the art, such as a roller-feed tray combination. The carding or opening roller is for the reduction of the final densification of the fiber mass. Normally the fibers are supplied in compacted fiber bullets. Therefore, the fibers are more in clusters than as loose fiber material. The opening roller opens these clusters, giving a more uniform fiber material. In addition, it is possible to mix binder fibers with the basic fiber material. Then the carding-opening roller functions additionally as a mixing device.

The loose fiber material is thrown from the carding roller to the lower lowering duct (10). This lower down conduit is in the width divided into smaller sections (9), each section being separated from the adjacent section by a wall, forming a plurality of small down ducts. Each of these downpipes (9) has at least two outlets, one that is connected to the recycling duct (5) and the second outlet (6) that is directed towards a collection device, here in the form of a belt perforated mobile

(8)

with a suction device (7) below the belt, located directly in opposition to the outlets (6) of the small downpipes. The collection device moves in a direction perpendicular to the width

(W)

of the fiber supply device, this direction being called the length of the fiber web or the product produced. Basically, the width W is limited to the width of the fiber delivery device, but the length L is not limited and depends on the product or band produced.

A pivoting flap (4) is located between the two outlets (5, 6) so that it can guide the flow of fibers either in the direction of the recycle duct (6) or in the direction of the collection device (5) . In a first embodiment, the fin is mounted on the upper wall of the duct and can be swung so that the channel to the recycle duct is open or closed. The recycling duct is connected to a fan to obtain a suction power uniformly extended over the total width of the channel. If the fin opens the channel to the recycling device, this suction power will be such that the fibers released from the carding roller are sucked into the channel instead of falling into the outlet duct directed towards the collection device. If the fin closes the channel to the recycling duct, the suction power is stopped and the fibers will fall / be directed to the duct or outlet directed to the collection device. Alternatively, the flap can be located in the corner between the outlet directed towards the recycling duct and the outlet directed towards the collection device (figure 3) and in this situation the pivot point is in the middle of the flap, opening to the same time a duct and closing the other duct.

In both cases, each of the fins is connected to its own pneumatic means to control and produce the pivoting movement of the fin.

The fibers will be grouped on a collection device (8). This can be a mobile perforated tape (as shown) or a rotating drum. The surface of the collection device can be either flat or have a surface in the form of molds. Below the collection surface, located directly below the fiber supply device, an vacuum duct (7) is located to keep the fiber material on the collection surface and prevent the fibers from being blown out.

Preferably, the carding roller has a sawtooth wire with a large tooth (11). In a preferred embodiment, the sawtooth is positioned in such a way that it functions as a screw and pushes the fiber material laterally, making possible easy and uniform access to the small downpipes.

The control of the direction of the fiber stream has the advantage that a discrete amount of the fiber material can be placed on a particular part of the surface of the collection device. A fiber distribution device divided into X smaller downpipes in the total width of the machine would be equal to X discrete areas in the pickup device below the exits, where quantities can be dropped

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discrete fiber material. Over the width, each of the fins can be fixed separately either to distribute the fibers to the collection device or to the recycling duct, whereby of the X positions there may be some that are empty or that receive a quantity of material.

Figure 7 shows a typical control plane for step production of a three-dimensional product. The total area of the collection device is divided into small squares, each square being equal to the width W 'and the length L' of the small downpipes. If a square is empty, this is to indicate that there is no fiber material, and corresponds to a signal to the analog fin of the small downpipe to direct the material out of the collection device, for example towards the recycling device. The amount of fiber material is given in each square where material is necessary, and this corresponds to the time in which the material flow is directed towards the collection belt.

In the direction of the mobile collection device perpendicular to the width of the fiber supply device, the length is divided into rows, each row being achieved by a step-by-step movement of the collection device. This step-by-step movement is dependent on the length of the small downpipes, the required amount of overlap of the rows. When a step-by-step movement occurs, it is dependent on the time required by a row, which is dependent on the time required by a small coffee duct to supply the largest amount of fibers needed in that row. By means of this flexible way of controlling the movement of the collection device and the direction of the fiber flow in time, it is possible to obtain a band of fibers in the shape of the desired product with varying densities throughout the product and even with areas without material of fibers. It is even possible to have these fiber-free zones in the middle of the product and not just at the edge.

Figure 4 shows an example of a nonwoven web 220 delimited by a contour 402 that includes a recessing portion 408, a hole 404 and a thickness reduction 406.

Figure 5 shows a second alternative device according to the invention for producing a band of nonwoven fibers 200.

The device for producing a band of nonwoven fibers 200 comprises:

-

a fiber feeding device 124;

-

a collection device 208;

-

a suction device.

The collection device 208 is fed with fibers by the fiber feeding device 124. It is movable with respect to the fiber feeding device 124 and contains perforations. The collection device 208 moves in the direction represented by the arrow 210. The movement of the collection device 208 distributes the fibers so that they do not accumulate in one place. In another embodiment, the pickup device 208 could be stationary, while the fiber feeding device 124 was moved. The suction device is designed to aspirate air through the perforations and thereby press the fibers against the collection device 208. This device may be the same for both alternative solutions.

The feeding device 124 comprises a plurality of ejector nozzles 230a, 230b distributed transversely, perpendicular to the direction of travel 210 of the collection device 208, and each ejector nozzle 230a, 230b is movable between a first position 230a and a second position 230b Each nozzle 230a, 230b can therefore be placed on its own either in the first position or in the second position and can do so independently of the others.

Each ejector nozzle 230a that is in the first position extends fibers over the collection device 208 and each ejector nozzle 230b that is in the second position extends fibers out of the collection device

208. In other words, only the fibers extended by the ejector nozzles 230a that are in the first position reach the collection device 208 and agglomerate to form the web of nonwoven fibers 220.

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The position of each ejector nozzle 230a, 230b is controlled by positioning means such as a pneumatic actuator or a servomotor. A control unit controls each of the positioning means according to the desired position of the ejector nozzle 230a, 230b to which it is connected.

By controlling the position of each ejector nozzle 230a, 230b, it is possible to modify the amount of extended fibers on the collection device 208 in front of each nozzle 230a, 230b, and thereby produce a band 220 of varying thickness. The face of the band 220 that is against the pick-up device 208 is flat, while the other side of the band 220 has height variations, each corresponding to a variation in the thickness of the band

220.

Figure 6 shows a band 220 comprising a thickness reduction 310 performed by positioning the corresponding ejector nozzle in the first position during a certain perforation and in the second position after the end of this period.

The travel speed of the collection device 208 and the flow rate of the fibers through the ejector nozzles 230a, 230b must be matched to each other in such a way that they produce the maximum desired thickness. The travel speed of the collection device 208 is made dependent on the flow of fibers in order to achieve a preferred fiber weight on the collection device 208.

Bands 220 of varying widths can also be produced by adjusting the outer ejector nozzles in the second position.

Thus, in the case of the band 220 of Figure 4, the thickness reduction 406 is achieved by extending fibers for a period less than that necessary to produce a greater thickness through the nozzles or ejector nozzles located approximately in the center of the collection device 208. The hole 404 is similarly produced by diverting all of the fibers extended by the relevant nozzle or ejector nozzles out of the collection device 208. The re-entering part 408 is created by diverting all of the fibers extended by the relevant nozzle or ejector nozzles out of the collection device 208. In order to ensure that the fibers ejected by the ejector nozzles 230b that are in the second position are not discarded, the production device 200 comprises a recycling device 302 to recycle said fibers. In the present case, the recycling device 302 is in the form of a funnel.

To re-inject the recycled fibers into the fiber feeding device 124, the production device 200 comprises a reprocessing device for returning the recycled fibers by the recycling device 302. The fibers thus follow arrow 304, which represents the device reprocessing

In a particular embodiment, the production device 200 comprises delimitation walls 232 located on the collection device 208. These delimitation walls 232 help to maintain the structure of the band 220 before it undergoes further treatment to give it mechanical strength. The delimitation walls 232 are approximately orthogonally fixed to the collection device 208 and preferably form a closed loop.

The post-treatment device may be a heating tunnel in which the hot air acts on the binder. Once it has been stiff, the nonwoven web 220 is molded using pressure and heat to give it its final shape.

The principle of operation (Figure 6) of the production device 200 of the invention will now be described. When leaving the fiber hopper 102, the fibers 120a are directed towards the two rollers 104 which rotate in the directions of the arrows 114, which form the distribution device or feeding means. The fibers 120b leaving the distribution device pass over the card roll 106, which opens them. Upon leaving the card roll 106, the fibers 120b are distributed to the various ejector nozzles 230a, 230b and are ejected by these ejector nozzles either to the collection device 208 or out of it. This distribution of fibers through all ejector nozzles 230a, 230b, even if some are directed out of the collection device 208, has another advantage over the practice of opening and closing each ejector nozzle according to demand. The problem with closing the ejector nozzles is that the pressure on the fibers within the closed ejector nozzles increases, and can cause clogging. In addition, each time the nozzle is opened again, a plug of condensed fiber material will be extended instead of loose fiber material.

As explained above, the process for producing the nonwoven web 220 comprises:

-

a step of moving the collection device 208 beyond the fiber feeding device 124 comprising a plurality of ejector nozzles 230a, 230b distributed transversely with respect to the direction of travel of the collection device 208;

-

a step of continuously extending fibers through the plurality of ejector nozzles 230a, 230b; Y

-

for each ejector nozzle 230a, 230b, movement steps between a first position in which the 15 fibers are extended on the collection device 208 and a second position in which the fibers are not extended on the collection device 208, and vice versa .

In a particular embodiment of the invention, each movement step between first position and second position is followed by a fiber recycling step.

Advantageously also, the fibers recycled in the fiber recycling step are subjected to a transport step to the fiber feeding device 124.

The process produces three-dimensional bands 220 by modulating the amount of fibers spread over

A particular place on the collection device 208. This production process can be followed by molding the band 220 by applying pressure and heat, in the course of which certain parts of the band 220 are compressed to a greater or lesser degree with in order to vary the density of certain places based on where the noise sources are.

30 Figure 7 shows a schematic diagram of the control mode and the production of a discrete product with areas of different weight of the fiber material or fiber-free material. Dark areas are areas with high weight, gray areas are product areas with normal weight and white areas are fiber-free areas. In comparison with the product of Figure 4, the re-entering portion 408 and the contour 402 are aligned with white areas and the area with the thickness reduction 406 would be gray.

The width W of the product is equivalent to the width of the fiber distribution device (12), the small downcomers (9) being shown schematically to understand in principle the method of fiber distribution. The surface of the collection device is moving in the L direction. The following is an example for the step-by-step discontinuous procedure that the following steps may have. The surface of

The collection is moved by a distance L 'in the direction L. L' is approximately the same distance as the length of the small downpipes (9), to obtain a vacuum surface below the distribution device. The pivoting fins are adjusted to either direct the fiber material towards the collection surface or direct the fiber material out of the surface. After a certain amount of time, the small downpipes that supply the fiber material to the collection belt can be redirected

45 to stop the flow of fiber material towards the collection surface, while the adjacent downstream conduit still supplies. This will create local areas with a greater weight of material. Finally, all fiber flows are directed outward from the collection surface. The surface is moved again in a length of L '.

50 In practice, it may be useful to move the collection surface by a distance greater than L 'to create an interruption, for example, between products. Depending on the fiber material, the fibers will stick or fall in the form of a heap with a peak. Therefore, it may also be an advantage to move a distance slightly less than L 'to create a slight overlap and to compensate.

It is not always necessary to direct all fiber flows out of the collection surface. Continuous movement of the collection surface during the distribution of the fiber material on the surface may result in a more gradual weight profile.

5 A computer control panel may reflect the diagram in Figure 7 with a possibility to set the desired amount of fiber material in each individual zone in advance.

Using the device and the method according to the invention it is possible to obtain products with zones of different weights or fiber-free zones throughout the product, follow the desired outer contours of the product and therefore minimize the cutting step after formation. of the product. � Reduce the process steps during the procedure and the total amount of scrap material.

The invention is, of course, not limited to the examples and embodiments described and illustrated, but can be subjected to numerous variants accessible to a person skilled in the art. Aspects described only in combination with one variant can also be used with the other variant in accordance with the invention that falls within the general scope of the invention as such.

Claims (6)

1. Fiber supply device comprising fiber feeding means, which feed fiber material through a carding roller or opening to fiber distribution means, 5 characterized in that the fiber distribution means are perpendicular to the collection means and are divided into a plurality of small fiber distribution means, which are constructed such that a continuous flow of fiber material can be directed either in the direction of the collection means or in an outward direction of the collection means.

10 2. Fiber supply device according to claim 1, wherein the small fiber distribution means is a movable ejector nozzle, extending the ejector nozzle 230a fibers over the collection device 208 in a first position and extending fibers out of the pickup device 208a in the second position.

3. A fiber supply device according to claim 1, wherein the small fiber distribution means is a small downstream duct separated from small downstream ducts adjacent to a wall, the small downstream duct containing a fin pivot located in such a way that it directs the flow of fibers towards the collection device or out of the collection device.

The fiber delivery device according to one of the preceding claims, wherein the fibers directed out of the collection device are directed towards a recycling device, preferably in the form of a conduit.

5. Fiber supply device according to one of the preceding claims, wherein 25 collection means are a mobile perforated tape, or mobile perforated plate or mobile perforated mold or perforated rotary drum. 6. Fiber delivery device according to one of the preceding claims, wherein vacuum means are located below the online collection means with the position in which the fiber material will be located by the distribution means. 7. Fiber supply device according to claim 3, wherein the small downpipe contains at least two outlets, one directed towards the collection device and the other outlet directed towards a recycling duct and the pivoting fin is located in such a way that at least one of the 35 outputs can be closed. 8. Fiber supply device according to claim 3, wherein the small downcomer contains at least 2 outlets, one outlet directed towards the collection device and the other outlet directed towards a recycle duct and the pivoting fin is located in such a way that after opening 40 of one exit the other exit closes simultaneously. 9. Fiber supply device according to one of the preceding claims, wherein each of the small fiber distribution means has pneumatic attenuation means and each of them is individually controlled by a PLC:  FIGURE�    FIGURE�   FIGURE�