JP2006529006A - Method and fiber distribution device for spreading fibers by air - Google Patents

Abstract

The fiber distributor is used in plants for producing nonwoven webs to lay the fibers (4; 6) with air on a seamless air permeable forming wire (9). The fiber distribution device comprises a forming head (2) having a perforated bottom (7) and a row (14) of rotatable wings (15), the rows of rotatable wings being fed during manufacture. (4; 6) are mounted at a fixed distance on the bottom (7) for sweeping along the row (14) of wings (15) in the air flow, after which they are formed wire (2) The forming head (2) is placed in series through the opening (8) in the perforated bottom (7) for deposition in the layer (16) on the upper part (17) of the. With the method and fiber distribution device according to the invention, it is possible to minimize the loss of fibers in the form of knits and at the same time to produce nonwoven webs at very high production rates.

Description

The present invention relates to a method and a fiber distribution device for laying fibers with air over a seamless air permeable forming wire in a plant for producing a nonwoven web, the nonwoven web comprising, for example: Is for uses like:
-Absorbent core material for feminine hygiene articles-Incontinence articles-Diapers-Tabletop napkins-Hospital products such as bed protection sheets-Tissues and-Towels.

  The fluffs commonly used for products of this nature are fluffs of relatively short cellulose fibers, fluffs of relatively long synthetic fibers, or fluffs of such fibers. For example, other materials such as SAP (Super Absorbent Powder) can be mixed in the fluff.

  The fiber dispensing device comprises a forming head placed on a forming wire and has a perforated bottom and at least one row of rotatable wings mounted at a distance above the bottom.

  The fibers fed to the forming head are swept by the row of wings in the air stream so that they are evenly distributed throughout the bottom during manufacture. Suction agglomerates placed under the forming wire simultaneously pass through openings in the perforated bottom of the fiber distribution device to produce a second air flow through the forming wire, thereby synchronizing the air flow. Are continuously deposited on the layer of the upper portion of the forming wire.

  Such a fiber dispensing device is known from Applicants' US Pat. No. 5,527,171, incorporated herein by reference.

  However, relatively long synthetic fibers tend to form knits with other similar or different types of fibers while being swept in the air stream, particularly by the rows of wings in the fiber distributor.

  A knit is a small entangled bundle of fibers, which can be quite stiff and difficult to open, even when recirculated to, for example, a hammer mill. This knit does not contribute to the volume, quality or strength of the nonwoven web. During the production of the web, the production of the knit should therefore be maintained at the lowest possible level.

  In practice, however, up to about 25% of the synthetic fibers supplied can be reduced to useless knits. Such knit loss needs to be replaced by the same quality of good fiber. Since synthetic fibers are particularly expensive, finished fiber products are also expensive.

  Previous experiments conducted to find a solution to this problem showed that the fiber content per unit area of the finished nonwoven web (decreased to knit) increased as a function of air flow velocity, In this air flow, the fibers were shown to be swept by the row of wings.

  This experiment also revealed that the capacity of the fiber distribution device, and thereby the overall capacity of the plant to produce the nonwoven web, also increased as a function of the speed.

  Therefore, the financial investment in such a plant is so expensive that the plant should be operated by air flow along the row of wings as fast as possible. This speed should, on the other hand, also be very slow to the lowest possible level in order to maintain the fiber content per unit area of the finished nonwoven web (reduced to knit).

  Thus, in practice, it is necessary to reach a compromise that the plant is operated with a relatively slow air flow along the wing row, and therefore the capacity of the plant is far from being fully utilized. .

  It is an object of the present invention to remedy the above-mentioned drawbacks of the known techniques.

  In a first aspect of the invention, there is provided a fiber dispensing device of the type specified in the introduction, which has a higher production capacity than previously known.

  In a second aspect of the present invention, there is provided a fiber dispensing device of the type specified in the introduction that produces fewer knits than ever known during operation.

  In a third aspect of the invention, a fiber distribution of the type specified in the introduction that produces fewer knits than previously known during operation and has a higher production rate than previously known. An apparatus is provided.

  In a fourth aspect of the present invention, there is provided a fiber dispensing device of the type specified in the introduction, arranged to regulate the process in which minimal knits are produced during operation.

  In a fifth aspect of the present invention, there is provided a fiber dispensing device of the type specified in the introduction, capable of obtaining a higher fiber dispensing device manufacturing capacity than previously known.

  In a sixth aspect of the present invention, there is provided a fiber dispensing device of the type specified in the introduction capable of operating the fiber dispensing device such that fewer knits than previously known are produced. The

  In a seventh aspect of the present invention, there is provided a fiber dispensing device of the type specified in the introduction, wherein fewer knits than previously known are produced at a higher production rate than previously known. The

  In an eighth aspect of the present invention, there is provided a fiber dispensing device of the type specified in the introduction, wherein the process can be adjusted in a manner that produces a minimum knit.

  According to the present invention, this fiber distribution device is arranged to adjust the rotational speed of the wings at a speed interval around the optimal speed, and the tendency of the fibers to form a knit increases the rotational speed of the wings. As it moves from less to higher.

  This speed interval is much higher than what the person skilled in the art previously thought would yield favorable results. This is because experiments conducted to solve the problem of fiber loss due to knit formation showed that fiber loss increased as the wing rotation speed increased.

  At the optimum speed, the production rate at the same time is also increased, so that the capacity of the fiber distribution device, and therefore the capacity of the whole plant, is better and more advantageous than previously known. Used for

  The optimum rotational speed of the wing can actually vary depending on the general conditions of the fiber structure and fiber composition, and also the general conditions of the manufacturing parameters of the fiber distribution device.

  This fiber distributor can therefore be arranged to adjust the rotational speed of the wings to an interval of rotational speeds that can include multiple speeds, and therefore certain conditions are not perfectly optimal.

  This spacing can be around the average rotational speed, and this adjustment can only be performed according to the fiber composition and the actual fiber distributor arrangement. This means that the rotational speed of the wing need not be optimal at every point in time, as the optimal speed can vary as explained above.

  The rotational speed of the wing can be optimal at all points in time, in other embodiments according to the invention, by continuously adjusting for each speed, in this case optimal at a given moment. This advantageously provides the lowest possible fiber loss due to knit formation.

  This embodiment comprises the steps of detecting the amount of knit per unit area of the fibrous layer on the forming wire or of the resulting nonwoven web; sending a signal representing the detection result as an input to a computer; Using a computer program to calculate a value representing an optimum rotational speed at which the number of knits at a given moment is small or minimal; and sending a signal representing this value from the computer as an output; Instructing the wing to rotate at the rotational speed represented by the above value.

  The fiber dispensing device according to the invention is self-controlled in this way, thus minimizing fiber loss during operation and at the same time automatically producing a nonwoven web at a very high production rate.

  In order to keep costs down by reducing the amount of material used to form the nonwoven web, it is important that the fiber loss due to knit formation is low. This loss is of course minimal at the optimum rotational speed of the wing.

  However, the benefits gained from operating the fiber distribution device with higher capabilities than the wing's optimal rotational speed are approximately the same as the costs due to fiber loss in the formation of the knit, and the benefits are Instead of a minimum knit content per unit area of the finished web, it can be used to control the process.

  The invention is explained in more detail below, in which further advantageous properties and only exemplary embodiments are described with reference to the drawings.

  The following detailed description is based on the assumption that the fibers are composed of a blend of relatively short cellulose fibers and relatively long synthetic fibers.

  The fiber distribution device 1 comprises a forming head 2 having an inlet 3 for cellulose fibers 4 and another inlet 5 for synthetic fibers 6. These inlets 3, 5 allow each fiber 4, 6 to enter the forming head into the air stream in the direction indicated by the arrow.

  The forming head has a perforated bottom 7 with an opening 8. During operation, a seamless air permeable forming wire 9 is placed on the roll 10 below the bottom in the direction indicated by the arrows. Only a portion of the forming wire is shown in FIGS.

  A suction box 11 is arranged under the forming wire. The evacuation pump 12 works to generate a suction pressure in the suction box via the air passage 13.

  In this example, five rows 14 are placed at a fixed distance above the perforated bottom, each having three rotatable wings 15.

  The wing rotates at a rotational speed such that during operation of the fiber distributor, the supplied fiber is swept along the row of wings in the first air stream, the fiber being driven by the rotating wing. Produced, thereby distributing the fiber over the bottom as illustrated by the arrows in FIG.

  The fibers in the first air stream are continuously sucked by the suction box and the evacuation pump through the openings 8 in the perforated bottom 7 that are tuned in the generated second air stream, thereby forming the upper part 17 of the forming wire. The fibers are deposited in a layer 16 on the top.

  The forming wire moves this layer in the direction of the arrow to be further processed in the part following the associated plant (not shown) in the manner in which the desired nonwoven web is formed.

  The synthetic fiber 6 is usually supplied as a main fiber, but the cellulose fiber 4 is supplied in the form of a fiber roll (not shown), which is separated into fluffs by a hammer mill (not shown). The

  FIG. 3 schematically illustrates a fragment of the nonwoven web 18 on a larger scale, which includes synthetic fibers 6 and cellulose fibers 4. As can be seen from this figure, this is a cellulose fiber formed by the ridges 19. The nonwoven web also includes a cellulose knit 20 composed of cellulose fibers alone and a composite fiber 21 composed of both cellulose fibers 4 and synthetic fibers 6.

  A knit is a bundle of small tangled fibers, which reduces the quality of the nonwoven web. Another disadvantage is that the knit is present in a very dense form. Therefore, there is a need to increase the fiber supply due to the quality of the fibers, which roughly corresponds to the mass of fibers constrained within the knit, thereby increasing the cost of manufacturing the web.

  The fiber roll already contains several knits from the beginning. During the disaggregation of the fibers, some processes of these fibers are released and form good fibers. At the same time, however, some other fibers are formed into a knit of a scale that is usually larger than the amount of fibers constrained in the knit, which is released. The percentage of knit in the disaggregated fluff also increases from about 1% to about 1.4% with the rate of disaggregating the fibers.

  On the way to the fluff layer 16 on the forming wire 17 from the hammer mill, more cellulose knit 20 can be produced in the fluff. The cellulose fiber 20 functions as a kind of core for forming the composite knit 21. The ridge 19 plays an important role in this respect in that it can capture synthetic fibers.

  This knit shows an increasing tendency during the air laying process. When a certain size is reached, the knit is then divided into two or more knits and then serves as a new core to form more knits.

  Experience has shown that the content of fibers per unit area of the finished nonwoven web confined within the knit increases with the speed of the first air flow, similar to the process in a hammer mill, and the proportion of knit is also It has been shown to increase with fiber disaggregation at the feed rate.

  If a good quality nonwoven web is desired, which means a low knit content, the production plant is therefore operated at a low production rate, thereby also reducing the cost to this fiber. is required.

  However, the overall manufacturing cost also depends on a typically fairly large investment in the entire plant. In order to pay sufficient attention to these large investments, plants need to be operated at high production rates.

  In practice, therefore, such a plant is operated at a production rate where the web produced has a relatively poor quality and the entire plant is operated at a relatively low capacity, and as a result is used in production. Due to the size of the fiber consumed, the production costs of the web are relatively high and the interest paid to the plant investment is low.

  Web manufacturers thus compromise where product quality and price, and also utilization of plant potential, is far from optimal.

This inappropriate situation is overcome by the present invention, which is described more decisively below with reference to FIG. 4 (illustrating an exemplary embodiment of the present invention). This figure shows the number of knits per m ² of the finished web (n / m ² ) as a function of the first air flow velocity v (m / sec) as a solid line. Is the air flow generated by the wings for sweeping the fibers along the perforated bottom of the forming head. Only knits having a cross-sectional size greater than 1 mm ² are counted in this example.

  In the same drawing, the power per wing (kg / w / hour) of the plant as a nearly linear function of the speed v (m / sec) is also shown in dotted lines.

The web produced in this example had a weight of 0.120 kg / m ² and was composed of 80% cellulose fibers and 20% synthetic fibers. The average length of cellulose fibers was about 2 mm, while the average length of synthetic fibers was about 6 mm.

  A row of wings rotated in the same direction as indicated by the arrows in FIG. 2, but two adjacent rows of wings rotated in opposite directions, thereby sweeping the fibers along the perforated bottom. Evenly distributed throughout this area.

  The perforated bottom was of the type described in Applicants' patent application WO 99/54537, “a shifting net for a fiber distributor”. The mesh size of the net was 4.

The above specification is common, for example, to non-woven webs used for incontinence articles and to existing manufacturing plants. The normal velocity of the first air stream used to produce the nonwoven web was 3 m / sec. At this speed, the number of knits per m ² was found to be 500 n / m ² with an output per wing per hour of 12 kg / w / h.

  These results are not very satisfactory. The quality of the product is poor and a fairly high speed of the fiber is used for the production of the web. This fact, combined with the fact that the output obtained is also quite low, results in higher manufacturing costs.

Those skilled in the art who are trying to obtain a better product, i.e. a product with a lower knit content, can reduce the speed v from the usual 3 m / sec to e.g. Although the content advantageously decreased from 500 n / m ² to a level of only 67 n / m ^2, it was derived from experiments that this improvement was at an output expenditure of only 1.0 kg / w / h.

  As a result, due to the high manufacturing costs and the desire to be able to supply customers with products of sufficient quality, those skilled in the art will soon have a low knit content even if the first air flow rate is reduced in this manner. Recognizing that no useful solution can be derived to the problem that high production rates are required simultaneously. When this conclusion is reached, the further experiment of reducing the velocity of the first air flow is stopped.

On the other hand, if one skilled in the art attempts to increase the output to reduce manufacturing costs in this manner, an improvement in output will soon be obtained at the expense of an unacceptable increase in the number of knits per m ^2. Notice, thereby again stopping further experiments.

  The person skilled in the art is therefore not led to the idea of conducting experiments at a speed far from that normally used. This was because, by performing the above experiments, we learned that changing the speed up or down from the normal speed that found the best compromise between manufacturing parameters did not mean any improvement.

  In accordance with the present invention, this technical prejudice is overcome by manipulating the wing with a high rotational speed that produces a velocity of the first air flow that is far from the normally used speed.

  In a preferred embodiment according to the invention, the wing is at a rotational speed such that the velocity of the first air flow is between 9 m / s and 16 m / s, in particular between 11 m / s and 14 m / s. It is rotated.

  In another embodiment according to the invention, the wing has a first air flow velocity between 5 m / sec and 26 m / sec, preferably between 8 m / sec and 17 m / sec, in particular 10 m / sec. Rotated at a rotational speed such as between 15 seconds and 15 m / second.

As is evident from FIG. 4, the number of knits per nonwoven web m ² is from 500 n / m ^{2 at} a speed of 3.0 m / sec to only 117 n / m ^{2+ at} a speed v of 12.7 m / sec. At the same time, the output increased to 60 kg / w / h.

  By using the technique according to the present invention, the surprising result is that the knit content in the finished nonwoven web is only about 24% of the normal, while the output is about 5 times the normal. It was.

Figure 4 also the content of knit in the finished nonwoven web, increases from 67n / ^{m 2} at a rate of 1.0 m / sec to a maximum value of 583n / ^{m 2} at a rate of 4.4 m / sec Indicates. The knit content decreases again to a minimum value of 60 n / m ² at a speed of 12.7 m / sec and then increases again.

  In this case, the optimum speed at which the optimum lowest knit content is obtained at the same time as a very large output increase is a speed of 12.7 m / sec. For other plants and webs with other fiber compositions, there is an optimal speed that may have the same or different size as this example.

  In a preferred embodiment of the invention, the distance between each of two adjacent wing rows is between rows +50 mm and 135 mm, in particular between rows +75 mm and 105 mm.

  Manufacturing parameters such as fiber composition and structure can change during the manufacture of the nonwoven web, thereby simultaneously changing the optimum speed. Therefore, the fiber distribution device is equipped with a regulator for adjusting the speed of the first air flow at intervals around the average optimum speed.

  According to the present invention, the interval is between 0.5 and 1.5 times, preferably 0.75 and 1.25 times the rotational speed of the wing that produces the average optimum speed. In particular, it has a size between 0.9 times and 1.1 times.

  The adjustment of the velocity of the first air flow can be advantageously carried out automatically and advantageously by means of a control system according to the invention, which system is schematically illustrated by the block diagram shown in FIG.

  The system comprises a detector 22, which is connected to a computer 23, which in turn drives an actuator 24 to rotate the wing and also to drive other functions of the plant. Connected to the actuator. Other functions of the plant may change as the velocity of the first air flow changes.

  In FIG. 5, a roll of cellulose fibers is fed to a hammer mill, the cellulose fibers are fed from the hammer mill to the forming head, eg, synthetic fibers are fed to the forming head, the forming wire is driven, and other air Only actuators 25, 26, 27, 28 and 29 are shown for driving the function generating the flow, but other actuators (not shown) for driving other functions are also included in the system. Can be connected.

  As seen in FIG. 1, the detector is located downstream of the forming head and on the forming wire fluff, and can be of any suitable type (eg, a digital photo detector, a laser detector or an ultrasonic detector). ).

  This detector determines the number of knits per unit area of the wire or nonwoven web fluff, or the number of knits per unit area of the wire or nonwoven web fluff, and also the size of each of these knits. Arranged to count.

  The result of the detection is continually transmitted to the computer as input, which also accepts input (not shown) for simultaneously supplying different fibers to the forming head.

The computer is equipped with a program and is adapted to calculate the fiber content per m ^{2 of} the wire or finished nonwoven web fluff based on this information.

  This content is a function of the velocity of the first air flow, in this example as illustrated previously by the solid curve shown in FIG.

  The computer program is also adapted to calculate the derivative for each point of the curve and continuously adjust the actuator 24 until the derivative is zero at a point on the curve.

  Here, the plant operator understands the present invention and also expects to find the optimum speed of the first air flow so that the plant is actually started at a speed within this interval. And then the speed is constantly adjusted to the optimum speed. The optimum speed is a point on the curve where the differential coefficient at a predetermined moment becomes zero.

  The computer of the control system for the process for laying with air, in a preferred embodiment of the present invention, has a memory for storing relevant data, which is obtained during the production of a particular web. It is done. By using this data, the plant can be started up easily and quickly at the next opportunity that the same web is produced.

  Since the derivative is zero at both the maximum and minimum points of the knit content curve, in one embodiment of the invention, the program is adapted to reject the maximum zero point, whereby the first air Only the flow velocity is adjusted to the minimum zero point. This minimum zero point is also the optimum point of the curve.

  To do this, the computer is loaded with values for the velocity of the first air flow used by known techniques, and the computer program is higher than the velocity for a given product, 0 Adapted to reject points.

  In this way it is possible to start production at any point on the curve.

  The computer is also adapted to adjust other actuators (eg, actuators 25, 26, 27, 28 and 29) in response to adjusting the velocity of the first air flow.

  According to the present invention, the fiber dispensing device is self-adjusting in the manner described above, thus minimizing the loss of fibers in the form of knits during operation and at the same time at a very high production rate. Automatically produce a nonwoven web. This plant is also very easy to start up and operate.

FIG. 1 schematically shows, from the side, a fiber distribution device according to the invention for laying fibers with air on a seamless wire by means of a forming head. The forming head has a perforated bottom and a rotatable wing that sweeps fibers along the bottom during operation. FIG. 2 shows the fiber distribution device of FIG. 1 viewed from above. FIG. 3 shows an enlarged view of a fragment of the nonwoven web. FIG. 4 is a graph showing the output per wing per unit time as a function of the number of knits per unit area of the nonwoven web and also the speed at which the fibers are swept along the perforated bottom of the forming head. . FIG. 5 is a block diagram of a control system for the air laying process performed by the fiber distribution device shown in FIGS.

Claims (12)

A method of laying fibers (4; 6) over air on a seamless air permeable forming wire (9), the method comprising:
Fibers (4; 6) in at least one row (14) of forming heads (2) having a perforated bottom (7) and rotatable wings (15) mounted at a fixed distance on the bottom (7). Supplying process,
At least one of the wings (15) in the first air flow by rotating the wing (15) while the fibers (4; 6) are tilted to form a knit (20; 21). Sweeping the fibers (4; 6) along row (14);
Adjusting the rotational speed of the wing (15) to a space around the optimum speed, wherein the tendency of the fibers (4; 6) to form a knit (20; 21) As the rotational speed increases, the fiber (4; 6) passes through the opening (8) in the perforated bottom (7) in the process of changing from lower to higher as the rotational speed increases, and in the second air flow. Continuously depositing the fibers (4; 6) on a layer (16) in the upper part (17) of the forming wire (9) by sucking the wire. The method according to claim 1, comprising adjusting the rotational speed of the wing (15) according to the composition of the fibers (4; 6). Selecting an interval of rotational speeds of the wings (15) around an average optimum rotational speed, wherein the number of knits (20; 21) is small or minimal; A size between 0.5 and 1.5 times the optimum rotational speed of the wing (15), preferably between 0.75 and 1.25 times, and in particular between 0.9 and 1.1 times A method according to claim 1 or 2, comprising a step having a size between. The method of claim 1, wherein the method comprises:
Detecting the proportion of knits (20; 21) in the fiber layer (16) on the forming wire (9) or in the resulting nonwoven web (18);
Transmitting a signal representing the result of the detecting step to the computer (23) as an input;
Using the input to calculate a value representing an optimum rotational speed by a program of the computer (23), wherein the number of knits (20; 21) at a given moment at the optimum rotational speed is: A process that is small or minimal, and a signal representing this value is sent as an output from the computer (23) and commands the wing (15) to rotate at the rotational speed represented by the value A method comprising the steps. A method for laying fibers (4; 6) with air on a seamless air permeable forming wire (9), the method comprising:
Fibers (4; 6) in at least one row (14) of forming heads (2) having a perforated bottom (7) and rotatable wings (15) mounted at a fixed distance on the bottom (7). Supplying process,
The fibers at a speed between 5 m / sec and 26 m / sec, preferably at a speed between 8 m / sec and 17 m / sec, in particular at a speed between 10 m / sec and 15 m / sec. Rotating the wing at a rotational speed such that it is swept along the bottom, and sucking the fibers (4; 6) through an opening (8) in the porous bottom (7) in a second air flow By continuously depositing the fibers (4; 6) on the layer (16) in the upper part (17) of the forming wire (9). A method for laying fibers (4; 6) over air on a seamless air permeable forming wire (9), the method comprising:
Fibers (4; 6) in at least one row (14) of forming heads (2) having a perforated bottom (7) and rotatable wings (15) mounted at a fixed distance on the bottom (7). Supplying process,
Rotating the wing at a rotational speed such that the fiber is swept along the bottom at a speed between 9 m / sec and 16 m / sec, in particular at a speed between 11 m / sec and 14 m / sec. In the upper part (17) of the forming wire (9) by sucking the fibers (4; 6) through the openings (8) in the porous bottom (7) in the process, as well as in the second air flow A method comprising continuously depositing the fibers (4; 6) on one layer (16). In a plant for producing a nonwoven web (18), a fiber distributor of the kind used to lay the fibers (4; 6) with air on a seamless air permeable forming wire (9). And the device is:
Comprising a forming head (2) having a perforated bottom (7) and at least one row (14) of rotatable wings (15) mounted at a fixed distance on the bottom (7);
The apparatus is for sweeping fibers (4; 6) fed along at least one row (14) of the wings (15) in an air stream during production, the fibers (4; 6) is then deposited through the opening (8) in the porous bottom (7) to be deposited on a layer (16) in the upper part (17) of the forming wire (2). 2) continuously away, so that the fibers (4; 6) are tilted while being swept in this way to form a knit (20; 21), the wings (15) being constant Rotated at the optimum rotational speed of the spacing, where the tendency to form a knit (20; 21) of the fibers (4; 6) from lower to higher as the wing rotational speed increases And change,
Fiber dispensing device. 8. The fiber distribution device according to claim 7, comprising a regulator for adjusting the optimum rotational speed according to the composition of the fibers (4; 6) and the actual arrangement of the fiber distribution device. The regulator is adapted to adjust the optimum rotational speed to an interval around the average optimum rotational speed, at which the number of knits (20; 21) is small or minimal , Whereby the spacing is between 0.5 and 1.5 times, preferably between 0.75 and 1.25 times the optimum rotational speed of the wing, and in particular 9. A fiber dispensing device according to claim 8, having a size between 9 and 1.1 times. 8. The fiber distribution device of claim 7, wherein the device is
The ratio of the knit (20; 21) in the fiber layer (16) on the forming wire (9) or the obtained nonwoven web (18) is detected, and a signal representing the detection result is input as a computer (23). Detector (22) for transmission to
A program of a computer (23) for calculating a value representing an optimum rotational speed with a small or minimum number of knits (20; 21) by means of the input and generating an output representing the value; One or more actuators (24, 25, 26, 27, 28, 29) for receiving and rotating the wing (15) at a rotational speed represented by such values
A fiber dispensing device. The mutual distance between each of two adjacent rows (14) of the wing (15) is between two wings (15), between rows +50 mm and 135 mm, in particular between rows +75 mm and 105 mm. The fiber distribution device according to claims 7 to 10, which is a mutual distance. The distance between the wing and the perforated bottom is between 1 mm and 12 mm, preferably between 2 mm and 7 mm, and in particular between 3 mm and 5 mm. Fiber distribution device.

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