EP2327648A2 - Method and device for creating a UD layer - Google Patents

Abstract

The device for producing uni-directional layer (7) from a predetermination number of filament strands (10), comprises a dispenser arrangement (8) for issuing the filament strands, a storage system (16) for intermediate storage of the filament strands, a spreader arrangement, and an output. The storage system comprises a storage for each filament strands. The storage is relatively arranged to each other adjacent to movable filament strands. The storage system comprises a fault sensor. A supply work is arranged between the dispenser arrangement and the storage system. The device for producing uni-directional layer (7) from a predetermination number of filament strands (10), comprises a dispenser arrangement (8) for issuing the filament strands, a storage system (16) for intermediate storage of the filament strands, a spreader arrangement, and an output. The storage system comprises a storage for each filament strands. The storage is relatively arranged to each other adjacent to movable filament strands. The storage system comprises a fault sensor. A supply work is arranged between the dispenser arrangement and the storage system. A filament strand-drive arrangement is arranged in running direction behind the spreader arrangement, which comprises a spreading device, which is arranged at different positions, where the adjacent filament strands run through different spreading device. The spreader arrangement is arranged downstream to a calibration device, which forms a breadth reduction device for each filament strands. The calibration device comprises a bandwidth variation device. A dividing device (24) is arranged before the spreader arrangement, which comprises a guide body with a groove for each filament strands. The filament strand-drive device comprises a nip in which the spread filament strands are impinged with a pressure. An independent claim is included for a method for producing uni-directional layer.

Description

The invention relates to a device for producing a UD layer of a predetermined number of filament strands with a dispenser arrangement for dispensing the filament strands, a memory arrangement for temporarily storing the filament strands, a Aufspreizanordnung and an output.

Furthermore, the invention relates to a method for producing a UD layer of a predetermined number of filament strands, which are withdrawn from a dispenser assembly in which one spreads the filament strands into strips, wherein the filament strands between the stripping and the spreading by a storage arrangement and after the spreading leads to an exit.

Such a device and such a method are for example out DE 698 19 699 T2 known.

DE 10 2005 008 705 B3 shows a device for feeding tapes to a knitting machine in which tapes are withdrawn from bobbins at a uniform speed, but further processed with predetermined downtimes. During downtime, the tapes are cached in a controlled memory.

Out. DE 10 2005 052 660 B3 For example, an apparatus and method for spreading a carbon fiber strand are known. To better spread the fiber strand, it is heated by passing an electric current through it.

DE 197 07 125 A1 describes a method for producing unidirectional ply, in which the spread fibers are joined together by cross-link yarns to form a web.

In the production of fiber-reinforced plastics, it is endeavored to give these plastics a certain tensile strength. This tensile strength is caused by the reinforcing fibers. The tensile strength is greatest in the direction in which the reinforcing fibers run. Accordingly, it is advantageous to align the reinforcing fibers of one ply all in one direction. Such a layer is then referred to as a "unidirectional layer" or "UD layer". In a UD layer, a plurality of fibers or filaments lie practically parallel to each other in one direction. Such UD layers serve to produce a mono-, bi- or multiaxial layer. In a multiaxial clutch several such UD layers are with different directions placed on each other and connected.

The fibers or filaments needed to reinforce the fiber reinforced plastic are in the form of filament strands or bundles. In carbon filaments, such a filament strand often contains several thousand individual. There are usually 12,000, 24,000, 50,000 or even 4,000,000 fibers or filaments per strand. The filaments of a filament strand must be handled together.

The filament strands are wound on spools, for example. Before processing, the filament strands must then be removed from the spools. Although it can be assumed that the filament strands are all wound with about the same tension on the spools. However, there are local differences that lead to corresponding local changes of the filament strands. If one then spreads the individual filament strands into ribbons and arranges them next to one another, then the problem often arises that the UD layer thus produced is not plane, but that distortions result which make subsequent processability more difficult. For example, it is more difficult to drape a cut UD layer into a mold before pouring a plastic matrix.

At the DE 698 19 699 T2 or DE 197 07 125 A1 Known procedure, the bands are provided after the spreading of the filament strands with a transverse cohesion, so that there is a transversely continuous UD layer. This situation is then on one Tree wrapped up. To produce a Multiaxialgeleges this UD layer can then be deducted from the tree and processed. The cross-cohesion should minimize the effects of ribbon differences.

However, a scrim that has been cross-cohesively has certain disadvantages in further processing. In extreme cases, a UD layer with transverse cohesion can only be deformed in one direction, namely in such a way that the filaments are bent. Due to the transverse cohesion, displacement of the filaments longitudinally relative to one another is practically impossible or no longer possible to a satisfactory extent.

The invention has for its object to produce a UD layer with good processability.

This object is achieved in a device of the type mentioned above in that the storage arrangement has a separate memory for each filament strand.

This takes into account the fact that the filament strands have on average all the same elongation and thus the same local length. In fact, however, local deviations may result. These deviations can now be compensated by the storage device. Length differences are thus averaged out over time. This makes it possible to wind the adjacent ribbon as a UD layer without a transverse cohesion on the tree and still for it to make sure that the individual ribbons are the same length. The same length can be achieved simply by setting the same voltage. Among other things, this tension is defined by a clamping force prevailing in the storage.

Preferably, the storages of adjacent filament strands are arranged offset relative to each other. This means that there is enough space available for each storage unit. For example, if the store has a roll over which the filament strand passes, then one can sufficiently store that roll, for example attach it to a lever arm, so that that roll can change position to provide a variable storage path. You can also store the role in a linear guide. In both cases, one can apply a predetermined tension to the roller (or other deflector) to introduce a given tension into the filament strand. This may be the weight of the roller or an additional force, such as a spring. For all elements of the memory is due to the staggered arrangement of adjacent memory sufficient space available.

The memory arrangement preferably has at least one fault sensor. In this case, an error sensor for all memory can be provided together. One can also provide each memory with its own error sensor or one uses a fault sensor for each group of memories. Since the bands are theoretically all the same and only local differences can be expected, it can be assumed that the memory Although the individual filament strands are filled differently during the generation of the UD layer, the filling levels of the individual storages will generally differ from one another. However, it can not be assumed that a memory overflows or runs idle. When this occurs, it is detected by the fault sensor and the device can be stopped and an error signal output. An operator can then check the situation and remedy if necessary.

Preferably, a delivery mechanism is disposed between the dispenser assembly and the storage assembly. The delivery mechanism pulls the filament strands out of the dispenser assembly and feeds them to the storage assembly. Thus, the memory array is not burdened with the forces that are necessary to strip the filament strands from the dispenser assembly.

Preferably, a Filamentstrangantriebsanordnung is arranged in the direction behind the Aufspreizanordnung. The filament strand drive arrangement can be formed, for example, by a second delivery mechanism. This Filamentstrangantriebsanordnung ensures that the forces that are necessary for spreading the filament strands into ribbons, are decoupled from the forces prevailing at the output. This makes it possible to spread the filament strands with a tensile stress that is, for example, much higher than the tensile stress with which the UD layer is wound up.

Preferably, the Aufspreizanordnung a plurality Aufspreizeinrichtungen on at different Positions are arranged, wherein adjacent filament strands run through different Aufspreizeinrichtungen. This makes it possible to spread the individual filament strands over a width that corresponds to a pitch width. The pitch width is given by the width of the UD layer divided by the number of filament strands used. It can be observed that the spreading of the filament strands into ribbons in many cases results in a thickness distribution in the ribbon which is not constant. Rather, this thickness distribution follows the shape of a bell curve. If you increase the filament strands beyond the pitch beyond, then you can make the thickness of the UD layer to a greater extent than before uniform, for example, by allowing the ribbon to overlap each other in the transverse direction. In this case, two thinner edge sections overlap one another, so that the sum of the thickness of the edge sections results in approximately the thickness of the tapes in their middle. An absolutely constant thickness is not achieved. The thickness is much more uniform.

It is preferred that the Aufspreizanordnung a calibration device is connected downstream, which forms a width reduction device for each filament strand. The calibration device pushes the ribbon, so the spread filament strands, transverse to the direction of something again together. In this case, the calibration device mainly acts on the filaments which are arranged in the edge regions. The center of the bands remains essentially unchanged by the calibration device. If filaments on the edges something are pushed together, then there is an increase in thickness, which is desired to make the thickness of the ribbon again uniform. When using the calibration device, one often gets by without overlapping the ribbon. The tapes then have no cross-cohesion with each other, so that a good deformability of the UD layer is ensured in several directions.

The calibration device preferably has a bandwidth variation device. When pushing the ribbon transverse to its direction of rotation, one can thereby produce portions of the bands which have a greater width and portions which have a smaller width. If the individual ribbons are then arranged next to one another, gaps are created in the sheet formed thereby, through which plastic can later pass. This makes it easier to realize a penetration of the gel with plastic. The bandwidth variation device may be formed in different ways. If the calibration device has a rotating shaft with grooves that ultimately define the width of the ribbons, then one can easily change the width of the ribbons by using grooves having a varying width in the circumferential direction. In this case, the width of the ribbons thus produced varies periodically. Another possibility is to form the calibration device by flanges located on a shaft, between which the tapes are passed. By changing the axial position of the flanged wheels can be a change in the width of the Ribbon effect. One can tune the width variation of adjacent bands to one another such that the bands with their larger widths abut each other when they are arranged next to each other, so that larger gaps are formed at the areas with smaller width.

Preferably, a dividing device is arranged in front of the spreading arrangement, which has at least one guide body with a groove for each filament strand. The groove determines the position of the ribbon. This allows the individual ribbons to be positioned with relatively high accuracy where they are needed later in the UD position. This is true even if the tapes are withdrawn from spools having a cross winding appearance.

Preferably, the Filamentstrangantriebsanordnung has a nip, in which the spread filament strands are subjected to a pressure. The nip, which may also be referred to as a nip, is formed for example by a pressure roller and a counter-element. The pressure roller ensures that the tapes in the filament strand drive arrangement can be taken without slip, so that they can be fed to the output, for example a winding, with defined tension conditions.

The object is achieved in a method of the type mentioned above by storing each filament strand in the memory array individually. As explained above in connection with the device, it is possible in this way to compensate for the locally occurring differences in length in the ribbon by the individual memory, so that the UD layer can be generated from bands that have locally the same location. The starting point is the idea that the filament strands wound up on the coils basically have the same properties. However, differences may arise over the unwind length of a single reel that can be compensated for by individual caching of the individual filament strands.

Preferably, the filament strands are drawn from the dispenser assembly by means of a delivery mechanism and fed to the storage assembly. Thus, one can decouple the forces necessary to strip the filament strands from the dispenser assembly from the forces in the memory assembly.

Preferably, a voltage at which the filament strands are spread is decoupled from a voltage at the output. This makes it possible to spread the filament strands with a relatively high voltage, so that you can produce very thin ribbon.

Preferably, the filament strands are spread out over a pitch width into ribbons, the pitch width corresponding to the width of the UD layer divided by the number of filament strands. The usual spreading of the filament strands takes place in that the filament strands via a rod with a relative small diameter pulls. In many cases you also use two or more rods. The filament strand is then subjected to a certain tensile stress. The filaments of the filament strand farther from the rod then attempt to approach the rod, trying to displace the filaments between themselves and the rod. In the middle of the filament strands, this displacement can not proceed as well as in the edge regions. Accordingly, a somewhat greater thickness remains in the middle of the filament strands. The edge regions, however, are thinner, so that the thickness distribution follows approximately the shape of a bell curve. If you increase the filament strands beyond the pitch width, then you have several options to make the thickness of the UD layer a little more uniform. One way is to let adjacent bands overlap one another. In this case, the sum of the thinner edge regions results in approximately the thickness in the middle of the ribbons. An absolute uniformity of the thickness will not be achieved thereby. The thickness is much more uniform than before.

Another possibility is that the bands are laterally pushed together after spreading. By pushing together only the filaments in the edge regions are applied. By contrast, the filaments in the middle of the ribbons are normally unaffected by the collapse. By pushing together so only the thickness of the ribbon is increased in the edge regions. In the middle it remains unchanged.

Preferably, when pushed together, ribbons of varying width are produced. As stated above in connection with the device, in this way, when the strips are brought together into a sheet, it is possible to create gaps between adjacent strips, through which a plastic can later pass to form a fiber-reinforced plastic part. The width change can be done periodically, for example. Adjacent tapes can then be arranged next to one another in such a way that they hit one another with their larger widths, so that a gap remains in the flat material in the areas of smaller width.

Fig. 1

eine schematische Gesamtansicht der Vorrichtung zum Erzeugen einer UD-Lage,

Fig. 2

eine vergrößerte Teildarstellung mit einem ersten Lieferwerk und einer Speichereinrichtung,

Fig. 3

eine vergrößerte Teildarstellung mit einer Ausbreiteinrichtung und einem zweiten Lieferwerk,

Fig. 4

eine vergrößerte Darstellung einer Spannungsmesseinrichtung,

Fig. 5

eine vergrößerte Darstellung einer Aufwickeleinrichtung und

Fig. 6

eine schematische Darstellung einer Aufspreizeinrichtung.

The invention will be described below with reference to a preferred embodiment in conjunction with the drawings. Herein show:

Fig. 1

a schematic overall view of the device for generating a UD layer,

Fig. 2

an enlarged partial view with a first delivery mechanism and a storage device,

Fig. 3

an enlarged partial view with a spreading device and a second delivery mechanism,

Fig. 4

an enlarged view of a tension measuring device,

Fig. 5

an enlarged view of a winding device and

Fig. 6

a schematic representation of a spreading device.

Fig. 1 shows a device 1 for generating a UD layer, which is wound on a tree 2. The tree 2 has side windows 3 and is arranged in a winding device 4. In the winding device 4 is a supply reel 5, from which a separating material 6 is withdrawn. The release material 6 is, for example, a paper or a foil made of plastic or a fabric or any other surface material which, during winding up of the UD layer 7 (FIG. Fig. 5 ) is wound together with the UD layer 7, so that the separating material 6 separates two successive turns of the wound on the tree 2 winding from each other.

In a gate 8, which forms a dispenser arrangement here, a plurality of coils 9 are arranged, of which in each case a filament strand 10 is pulled off tangentially. The filament strands 10 are wound onto the bobbins 9 in a cheese form. By the tangential deduction of the rotating coil 9 avoids that a rotation is entered into the filament strand 10. To achieve a certain tension in the filament strand 10, the coil 9 is braked. The band tension achieved should be as uniform as possible and constant over the entire course of the coil. If you are talking about filaments and filament strands then you should also fibers and fiber strands underneath to be understood.

The gate 8 has at its output guide elements 11, which prevent the filament strand 10 causes a lateral movement, which could be caused by the Kreuzspulaufbau. These guide elements 11 consist for example of flanged wheels at deflection points. If particularly high demands are made on the running quality and the lateral offset should be further minimized, so also not shown band pivot come into consideration. These bands pivot the filament strand 10, which is iridescent and unwound from the coil 9, in the vertical order. The lateral offset is thereby converted into a rotation about the longitudinal axis of the filament strand 10.

Instead of the gate, it is also possible to use a different dispensing arrangement, as long as it is ensured that the filament strands 10 can be pulled off untwisted.

The gate 8 is followed by a transition region 12, which bridges a distance to a first delivery mechanism 13. The plurality of filament strands 10 runs approximately parallel and with a distribution transversely to the running direction, which essentially corresponds to the width of the finished UD layer 7. The filament strands 10 are therefore evenly distributed over this width.

Due to the free length in the transition region 12, in which the filament strands 10 are not supported, it is it is possible that upon the occurrence of a wrong rotation, which could have occurred at the end of the coils 9, this rotation is retained so long that it can be reversed by a further rotation in the opposite direction.

In the first delivery 13 ( Fig. 2 ), each filament strand 10 is guided without slip over a plurality of drive rollers 14. The freedom from slippage results from a sufficiently large wrap around the drive rollers 14. The drive rollers 14 have the same peripheral speed. This is achieved in a simple manner in that they all have the same diameter and identical speeds. For this purpose, they are driven by a common servo motor 15 for the sake of simplicity. All filament strands 10 are transported at the same speed. All filament strands 10 lie parallel in a plane.

The first delivery mechanism 13 is followed by a storage arrangement 16, which has a separate storage path for each filament strand 10. For this purpose, the memory arrangement 16 has three cylinders 17-19. There may also be more cylinders 17-19. The incoming filament strands 10 are then passed alternately in the transverse direction over the first cylinder 17 in the running direction or over the cylinder 18 in the running direction down. A filament strand 10, which is passed over the cylinder 17 down, is deflected by a roller 20 back up, the roller 20 is disposed on a pivotable lever 21. About the second cylinder 18, the corresponding filament strand 10 is deflected again in the direction of travel. The neighboring one Filament strand 10 is deflected via the second cylinder 18 down, then passed over a roller 22 which is fixed to a pivotable lever 23, and deflected over the third cylinder in the direction of rotation 19 again in the direction of travel. Accordingly, each filament strand 10 is assigned a separate roll 20, 22. The rollers 20, 22 form a storage path with a variable length and act on the corresponding filament strand 10 by its own mass or by other suitable means, such as a spring, a working cylinder or the like, with a tensile force. This creates a tension in the filament strand 10. In this case, each filament strand 10 is acted upon individually. The flock of filament strands 10 is divided into two groups or levels. If the passage of all filament strands 10 through the device 1 without interference or within low tolerance limits, then all rollers 20, 22 are located approximately in the same position. If one or more rollers 20, 22 take a significantly different position, then there is an unwanted deviation in the crowd of filament strands 10 before. By determining these role positions by means of error sensors not shown in detail (it can also be a common error sensor, be provided) conclusions about the causes of the deviation can be drawn and countermeasures are initiated.

The memory arrangement 16 is followed by a dividing device 24. The dividing device 24 has two deflection bars 25, which have two tasks. The deflection rods 25 have a plurality of ribs, so that grooves are formed, in each of which a filament strand 10 is guided becomes. The term "groove" is to be understood here generally as a geometric shape having two lateral boundary walls. The arrangement of the grooves results in a predetermined position for each filament strand 10 in the width direction. In addition, determine the ribs, so the lateral walls of the grooves, also how far each filament strand 10 can spread here. Characterized the basis weight of a ribbon 26 is defined, which later forms from the filament strand 10. The wider the corresponding filament strand 10 can spread, the lower the basis weight of the ribbon 26. The basis weight of the ribbon 26 corresponds to the basis weight of the UD layer 7. The ribbon 10 are suitably guided in S-shape over two or more deflection rods 25. Since this guidance already takes place under a certain tension, this already sets up a low spreading effect.

The dividing device 24 is followed by a spreading arrangement 27. In the spreading arrangement a plurality of deflection rods 28a, 28b are arranged, over which the group of filament strands 10 is pulled. By the deflection over the deflection rods 28a, 28b over a predetermined angle, for example 180 °, there is an increase in the tension in the individual filament strands 10 and in conjunction with the deflection to a spreading out of the filament strands 10. The filament strands 10 are thereby spread. The wrap around the deflecting rods 28 is adjustable. The values for the tension in the filament strands 10, processing speed and wrap angle are properly selected when, after the spreading arrangement 27, the widths of the then formed ribbon 26 correspond to a predetermined value.

Fig. 6 shows the Aufspreizanordnung 27 something clear in a schematic representation. It can be seen that two deflecting rods 28a, 28b are provided, which are arranged at different positions. About this deflecting rods 28a, 28b adjacent filament strands 10 are guided alternately. When numbering the filament strands 10 in the transverse direction, for example, the filament strands 10 with an odd ordinal number are guided over the deflection rods 28a and the filament strands with a straight ordinal number are guided over the deflection rods 28b. Auxiliary rollers 44-47 ensure the course of the filament strands 10.

Characterized in that adjacent filament strands 10 are guided over different Aufspreizeinrichtungen 28a, 28b in the Aufspreizanordnung 27, which are spatially separated from each other, the adjacent filament strands 10 do not hinder each other during spreading. It can therefore be spread over a pitch width, i. across the width of the UD layer 7 divided by the number of filament strands 10th

In such a spreading arise ribbon 26, which have a thickness profile in the transverse direction, which has approximately the shape of a bell curve. In other words, the bands 26 are somewhat thicker in their middle than in their edge regions. If one composes a UD layer 7 of such bands 26, then the UD layer 7 has a corresponding ripple.

To remedy this problem, one can overlap the adjacent bands 26 which have been spread beyond the pitch width. In this case, an addition of the thicknesses of the edge regions results in the overlapping region, which corresponds approximately to the thickness in the middle of the strips 26 when appropriately adjusted.

Another preferred embodiment, however, is to guide the bands 26 through a respective calibration device 48, 49. The calibrating device 48, 49 has, for example, for each ribbon 26 a groove, which ultimately defines the width of the ribbon 26 that has been passed through the groove. Since the ribbon 26 was previously wider than the groove, the ribbon 26 is slightly collapsed laterally in the groove, i. the calibration device 48, 49 forms a width reduction device. The width of the ribbons 26 can then be adjusted exactly to the pitch width, so that after joining the ribbons 26 in a nip 50, which is formed by two rollers 51, 52, a sheet is formed in which there are no longer any gaps. However, one can set the width of the ribbon 26 is also slightly less than the pitch width, so that gaps between adjacent bands 26 result, for example, have a width of 0.1 to 0.5 mm.

The grooves of the calibration devices 48, 49 are arranged offset in the transverse direction to each other and that by the width of each groove, so that the ribbon 26 can later unite without further deflection in the transverse direction to the UD layer 7.

If one provides the grooves of the calibration means 48, 49 in the circumferential direction with a varying width, then also arise ribbons 26 with a width that varies continuously and periodically in the running direction. Later, when the ribbons 26 are combined to form a sheet, voids or recesses are formed between adjacent ribbons 26 in the regions of the ribbons that have a smaller width, through which a plastic can later pass when a fiber-reinforced plastic element is produced. Alternatively, it is also possible to use calibration devices 48, 49, in which the bands 26 are guided between flange discs whose axial position can be changed. When the flanges are pushed closer together, resulting band areas with a smaller width. As the flanges are moved farther apart, band areas with a greater thickness result. In all cases, the width variation is relatively small. It is sufficient if the bandwidth is changed by a few percent, for example 3.5% or 10%.

No transverse cohesion is created between adjacent ribbons 26, which is beyond cross-cohesion of fibers in a filament strand 10 or ribbon 26. The filaments are usually coated with a size, which can lead to an adhesion of the individual Fialmente each other in a warming, as for example, caused by friction during deflection. However, this clinging is so weak that it is not possible to use the so slightly heated sizing of the tapes 26 for a transverse cohesion between the tapes 26. The individual bands 26 can therefore still be separated easily from each other.

In Fig. 3 are at the output of Aufspreizanordnung 27 a plurality of tapes 26 gapless side by side to recognize, so that there is the impression of a sheet.

In the direction behind the Aufspreizanordnung 27, a voltage measuring device 29 is arranged, which determines the voltage of the individual bands 26 individually. The tension measuring device 29 is in Fig. 4 magnified. Here it can be seen that the individual ribbons 26 are each guided individually via a measuring cylinder 30, 31. Since the bands 26 have already reached their final width in this area, ie form a closed area, it is necessary to separate the bands 26 into two levels, so that each band can be measured individually. Since a transverse cohesion between two adjacent bands 26 is not present, such a separation is easily possible.

The measuring cylinder 30 is attached to a lever 32 which is supported by a roller 33 on a measuring sensor 34. The measuring sensor 34 may be a piezoelectric sensor. But he can also work according to another principle. The measuring cylinders 31 of the other group are mounted in a corresponding manner on levers which are supported on a measuring sensor 34 via rollers.

In order to keep the device complexity low, one can use a single measuring sensor for each group of measuring cylinders 30, 31, which measures the individual band tensions sequentially, for example at intervals of one second each time. For this purpose, the measuring sensor 34 is arranged on a support 35 which is displaceable on a rail 36 transversely to the direction of the ribbon 26 and can be moved oscillating under the levers 32 back and forth.

By measuring the belt tension in each individual belt, it is possible to determine friction coefficient anomalies, which can arise, for example, due to contamination, and to correct them by changing the belt tension of the storage arrangement 16 before spreading out. Upon exiting the tension measuring device 29, the ribbon 26 are brought together again to form a closed surface.

The tension measuring device 29 is followed by a second delivery mechanism 37 as a filament strand drive arrangement. The second delivery mechanism 37 has a plurality of rollers 38 over which the bands 26 are guided without slip. The rollers 38 have the same peripheral speed. They have expediently the same diameter and are driven by a servo motor 39 at the same speed. At the last of the rollers 38 may still be arranged in a manner not shown nor a pinch roller, so that there is a nip, through which the ribbon 26 to spread filament strands 10 are guided. That's one way to do it ensure that the bands 26 are guided without slip by the second delivery mechanism 37.

The second delivery mechanism 37, together with the band storage arrangement 16, generates the tension necessary for spreading or spreading the filament strands 10 into ribbons 26. This voltage can be relatively high. Depending on the fibers used, the tension necessary to spread or spread the filament strands 10 to ribbon 26 may be on the order of 100 to 400N.

In the winding device 4, the UD layer 7 is to be stored with a substantially lower voltage than winding. Accordingly, one may use the second delivery mechanism 37 to achieve decoupling between the tension used to spread the filament strands 10 and the winding tension.

In order to set equal, defined tensile forces in all bands 26, a band storage device 40 is provided, which is arranged between the second delivery mechanism 37 and the winding device 4. The tape storage device 40 may be constructed exactly as the storage device 16. However, the adjustment of the pulling force on the levers 21, 23 may differ substantially from the values of the storage device 16. The size of the voltage is dependent on the demands on the end product, ie the UD layer 7, and the material properties of the filament strands 10.

In the tape storage device 40, it is again necessary to use the closed surface of the parallel spread To divide ribbon 26 into two or more groups. However, by merging both groups of ribbons 26 after passing the band storage device 40, the closed surface of the UD layer is restored.

After leaving the strip storage device 40, so to speak, the UD layer forms again automatically with a closed surface without gaps and without cross-cohesion between the individual strips 26. The transverse cohesion is at most as great as the transverse cohesion between filaments within a filament strand 10.

The UD layer is then wound up between the side windows 3 of the tree 2. The drive of the tree 2 is effected by a servomotor 41, which operates in conjunction with the motors 15, 39 of the two delivery mechanisms 13, 37. As the diameter of the tree 2 increases, the torque of the servomotor 41 increases. However, the speed may decrease.

All filaments of the superimposed turns of the UD layer are parallel. To avoid that these parallel filaments or fibers cling to each other, the release material 6 is wrapped during winding between the individual turns with.

The separating material 6 is unwound from the supply reel 5, which may be driven or braked by a servo drive 43. This ensures that also the separating material 6 is supplied with a constant tensile force over the entire winding process.

Claims (16)

Device for producing a UD layer (7) from a predetermined number of filament strands (10) with a dispenser arrangement (8) for dispensing the filament strands (10), a memory arrangement (16) for temporarily storing the filament strands (10, a spreading arrangement (27) and an output, characterized in that the memory arrangement (16) for each filament strand (10) has its own memory. Apparatus according to claim 1, characterized in that the memory of adjacent filament strands (10) are arranged offset relative to each other. Apparatus according to claim 1 or 2, characterized in that the memory arrangement (16) has at least one fault sensor. Device according to one of claims 1 to 3, characterized in that between the dispenser assembly (8) and the storage arrangement (16) a delivery mechanism (13) is arranged. Device according to one of claims 1 to 4, characterized in that in the running direction behind the Aufspreizanordnung (27) a Filamentstrangantriebsanordnung (37) is arranged. Device according to one of claims 1 to 5, characterized in that the Aufspreizanordnung (27) a plurality Aufspreizeinrichtungen (28a, 28b) which are arranged at different positions, wherein adjacent filament strands (10) by different Aufspreizeinrichtungen (28a, 28b) run. Apparatus according to claim 6, characterized in that the Aufspreizanordnung (27) a calibration device (48, 49) is connected downstream, which forms a width reduction device for each filament strand (10). Apparatus according to claim 7, characterized in that the calibration means (48, 49) comprises a Bandbreitenvariationseinrichtung. Device according to one of claims 1 to 8, characterized in that in front of the spreading arrangement (27) a dividing device (24) is arranged, the at least one guide body with a Groove for each filament strand (10). Device according to one of claims 5 to 8, characterized in that the Filamentstrangantriebseinrichtung (37) has a nip, in which the spread filament strands (10) are subjected to a pressure. Method for producing a UD layer (7) from a predetermined number of filament strands (10) which are drawn off from a dispenser arrangement (8) in which the filament strands (10) are spread out into strips (26), whereby the filament strands (10) 10) between the stripping and the spreading by a storage device (16) and after spreading leads to an output, characterized in that one stores each filament strand (10) in the memory array (16) individually. A method according to claim 12, characterized in that the filament strands (10) are removed from the dispenser assembly (8) by means of a delivery mechanism (13) and supplied to the storage device (16). A method according to claim 11 or 12, characterized in that a voltage at which the filament strands (10) are spread apart, decoupled from a voltage at the output. Method according to one of claims 11 to 13, characterized in that spreads the filament strands (10) over a pitch width out to tape (26), wherein the pitch width the UD layer (7) divided by the number of filament strands (10) corresponds. A method according to claim 14, characterized in that the strips (26) collapses laterally after spreading. A method according to claim 15, characterized in that one produces when pushing together ribbon (26) with varying width.

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