DE102008012839B3 - Device for producing strand shaped composite material from roving, has outlet channel with funnel inlet into which nozzle protrudes to form ring gap, where roving is saturated with homogeneous mixture of reaction components - Google Patents

Abstract

The device has a mixing head (40) with a mixing chamber (430f), and a channel (418) for a roving (50) fed through an outlet of the mixing chamber over an injection nozzle (423c). One of another two channels (420d, 430d) for reaction components (60, 70) such as isocyanate and polyol, has outlets (420e, 430e), which are arranged such that the components are turbulently swirled in the chamber. An outlet channel (443b) has a funnel inlet (443a) into which the nozzle protrudes to form a ring gap (443c). The roving is saturated with a homogeneous mixture of the reaction components. An independent claim is also included for a method for operating a device for producing a strand shaped composite material from a roving.

Description

The The invention relates to a device for producing a strand-like composite material a roving formed with one of two reaction components Reinforced plastic is, in particular with polyurethane, which has a mixing head with a Having mixing chamber.

at Devices of this kind must the two, the reactive plastic forming reaction components be dosed and mixed in a suitable manner. It occurs the problem is that the reaction of the two components is relative can occur quickly and thus only a short process time available is accurate to the components in a desired concentration to dose and if possible to mix homogeneously. This problem is especially noticeable if the two reaction components in a continuous, processed quickly running process and z. B. for impregnation of fibrous Starting materials are used. Such starting materials are also known as roving and consist of a bunch of endless stretched fibers. The fibers in such a bundle can z. Example of glass, aramid or carbon.

A device of this kind is z. B. from the EP 1 702 737 A1 known. The reactive components are fed from storage tanks via dosing a mixer. At least one of these metering units consists of a piston metering unit. This has a metering piston and a spindle unit acting thereon with a spindle and a spindle nut driven by a torque motor. The pressure lines at the outlet of the metering units are brought together in a mixer in which the actual reactive mixture of the two reaction components is formed. The reactive mixture is finally removed from the mixer z. B. introduced into a mold and cured there.

From the DE 196 18 393 A1 discloses a method and an apparatus for the production of interspersed with reinforcing fibers plastic parts. For this purpose, a stream of flowable plastic is produced, which is combined outside of a mixing chamber to produce reactive plastic mixture or outside a plasticizing unit for producing thermoplastic resin melt with a stream of reinforcing fibers.

From the US 3,042,567 A For example, a method and apparatus for making a continuous fiber strand wetted with liquefied plastic is known. This is to improve the distribution of liquefied plastic on the fibers of the strand. For this purpose, the fiber strand is surrounded at the outlet from a feed from a device for swirling the liquid plastic.

From the DE 195 23 490 A1 a device and a method for impregnating fiber strands with plastic material is known. A device for impregnating fiber strands with plastic material as a matrix material has an impregnating channel formed in the conveying direction on both sides by boundary surfaces. The boundary surfaces surround the impregnation along a common axis of symmetry concentrically to form an annular gap. The impregnation channel is formed with spacing elements at successive intervals. The outer dimensions of the impregnation channel taper stepwise in the foot direction. The spreading elements are executed on the steps in the form of expanding rings.

Of the Invention is the object of a device of this kind continue to improve so that so that a particularly good dosage and mixing the reaction components, and an improvement the impregnation Roving with the reaction components is possible.

to solution This task is the mixing chamber in the mixing head of the device according to the invention characterized by a first channel for the roving, which has a injection nozzle with a first exit opening supplied to the mixing chamber and a second or third channel for the first or second reaction component with a second or third outlet opening. These second and third exit openings are arranged that the reaction components in the mixing chamber preferably turbulent be swirled. After all is an exit channel for the roving with an inlet funnel into which the injection nozzle under Forming an annular gap protrudes, and the roving in it with a homogeneous mixture of the reaction components is soaked.

With this version the mixing chamber of the device according to the invention is the particular advantage connected, on the one hand, the homogeneous mixing of the two reaction components and on the other hand the soaking of roving with this homogeneous mixture in different areas of the Mixing chamber take place. This spatial Separation has the advantage of having the roving over its entire length through one resulting from the chemical compound of the reaction components Plastic with uniform quality, d. H. without inhomogeneity zones, imbued can be. After curing the reaction component has a manufactured in this way restiform Composite no weak points.

A Device according to the invention is the first to process isocyanate and polyol and second reaction components to produce a polyurethane tempered Composite suitable.

In a preferred embodiment the turbulence of both reaction components is particularly effective, when the second or third outlet opening is arranged such that the first and second reaction components of the mixing chamber approximately axially or radially fed to the roving becomes.

According to one particularly advantageous embodiment of the device according to the invention the mixing head has a hollow needle with needle body, needle channel and needle tip on. The needle channel serves as the first channel for the roving and the needle tip with the first outlet opening as an injection nozzle. Farther is the needle body in a second channel for the first reaction component serving receiving channel arranged so that this reaction component of the mixing chamber axially around the needle tip supplied becomes.

These execution has the particular advantage that the receiving body surrounding the needle body at the same time as a kind of annular channel for supplying the first reaction component serves. This is thus virtually tangential around the injection nozzle and thus fed parallel to the direction of movement of the roving of the mixing chamber. This will on the one hand the mixing with the second, laterally to the Fed mixing chamber Promoted reaction component. About that In addition, the entire flow through the mixing chamber with the swirled reaction components in the direction of the annular gap, the the transition forms the outlet channel, and taking place in the outlet channel impregnation of the Rovings promoted.

at this version is it additional advantageous when serving as the injection nozzle for roving needle tip is formed as a bead.

This has the advantage that the flow of the over the annular receiving channel supplied first reaction component on entering the mixing chamber which impinges as a kind of obstacle acting bead. The inflow of this Reaction component is thus partially deflected radially laterally and thus swirled upon entry into the mixing chamber.

at this version it is advantageous if the bead around the injection nozzle a Has cross section which is not smaller than the cross section of the receiving channel is, and the needle body axially displaceable in the receiving channel, that the second outlet opening for the first Reaction component with the bead of the needle tip in the width adjustable or lockable.

Of the the injection nozzle for the Roving wearing surrounding bead in this case not only for swirling the first reaction component when entering the mixing chamber at. Rather, so is the incoming Quantity of this reaction component metered. Furthermore, the needle body can even be postponed, in particular, be withdrawn, that the Boss the second outlet at the end of the recording channel for the needle body Completely covering, and thus the inflow the first reaction component is interrupted. Wise z. B. here Bead and receiving channel coinciding Cross sections, so the bead at the head of the hollow needle for Shut off the second outlet also completely withdrawn into the receiving channel become.

With this version can be achieved in case of shutdown of the mixing head, that the liquid volume depleted in the mixing chamber on the first reaction component. The Mixing chamber will then only after a certain time with the filled second reaction component and flushed with it. The mixing chamber is then no longer with a reactive mixture filled, so no curing of residual plastic and unwanted Gluing in the interior of the mixing chamber are to be feared.

at another embodiment a displaceable piston is present, at the end of the injection nozzle with the first outlet for the roving is arranged. In this case, a wall of the mixing chamber is displaced by the End of the piston formed. To shut down the mixing flask is the piston over this end completely into the mixing chamber, so that the inlet funnel of the injection nozzle filled out and the first outlet for the Roving flows directly into the outlet channel.

These execution has the further advantage that for a shutdown of the device the mixing chamber completely can be closed, d. H. their volume is gradual Advancing the piston is reduced to zero. This can the mixing chamber is continuously emptied of reaction components become. In this state fills also the injection nozzle the exit opening for the Roving completely out, so that the roving then almost straight through the first Channel and the first outlet at the head of the injection nozzle running directly into the outlet channel. So can a drink of the roving be turned off with certainty.

Finally, the third outlet be placed for supplying the second reaction component in the mixing chamber so that it is released or shut off when the piston is returned or advanced. With this design, it is possible in a simple manner, for. B. during a gradual emptying of the mixing chamber at the same time to cause an interruption of the supply of the second reaction component.

at A method for operating the device according to the invention is for stopping the mixing head in a first step, the supply of the first reaction component shut off in the mixing chamber. In a second step, the mixing chamber by sole supply the second reaction component rinsed. In a third step then also the feeder shut off the second reaction component and the mixing chamber completely closed. Then, in a fourth step, at least the fourth outlet opening feed cleaned the roving, and finally in a fifth step the feeder locked off the roving.

This Method is good for processing z. B. of isocyanate as the first Reaction component and of polyol as a second reaction component with a device according to the invention suitable. In this case, the mixing head can be shut down safely, so that This again without any costly chemical cleaning measures can be put into operation. The staggered interruption of the feed The reaction components thus not only terminate the formation of Polyurethane as a plastic, but also allows a rinse of Mixing chamber with the only non-reactive second reaction component. The after complete closure The mixing chamber remaining in the mixing head cavities can finally by a caster be cleaned with fresh roving. To avoid unnecessary waste finally becomes after expiration of a certain shutdown time, the supply of Roving final switched off.

The Principle of the invention and advantageous embodiments thereof are hereinafter closer to the figures explained. Show

1a - 1b the mixing chamber in the mixing head of a device designed according to the invention, wherein the mixing chamber is shown in working position or in the closed state,

2a - 2c an advantageous embodiment for a mixing chamber, which is shown in working position, with shut off the first reaction component or in the closed state,

3 a section through an advantageous embodiment for the mixing head of a device designed according to the invention,

4 a detailed view of a hollow needle in the mixing head of 3 .

5 a detailed view of a displaceable piston in the mixing head of 3 .

6a . 6b a detailed view and section of a nozzle sleeve in the mixing head of 3 .

7 a detailed view of a nozzle head in the mixing head of 3 .

8th a detailed view of the mixing head of 3 in working position,

9 a detailed view of the mixing head of 3 with shut off the first reaction component, and

10 a detailed view of the mixing head of 3 in the closed state of the mixing chamber.

The 1a and 1b show in the form of a schematic representation of a designed according to the invention mixing head 40 with a preferably cylindrical mixing chamber 430f , The mixing head 40 becomes an endless plastic fiber strand 50 also called roving, as nuclear material via a first channel 418 fed, and into the mixing chamber 430f by means of a first outlet opening 419 at an injection nozzle 423c brought in. Furthermore, the mixing head 40 the first and second reaction components 60 . 70 , in particular isocyanate or polyol, for the plastic via a second and third channel 420d . 430d fed, and into the mixing chamber 430f via second and third outlet openings 420e . 430e brought in. Nuclear material impregnated with the two reaction components 90 gets out of the mixing chamber 430f finally via an exit channel 443b dissipated.

According to the invention, the second and third outlet openings 420e . 430e placed and / or aligned so that the two reaction components 60 . 70 in the mixing chamber 430f preferably turbulently swirled. In the in the 1a and 1b illustrated embodiment, this is the outlet openings 420e . 430e exemplarily arranged such that first or second reaction component 60 . 70 the mixing chamber 430f approximately axially or radially to the inlet direction of the roving 50 be supplied. This allows a particularly homogeneous mixing of the two reaction components to form a reactive mixture 80 be achieved.

According to the invention further comprises the off enters channel 443b at the transition from the interior of the mixing chamber an inlet funnel 443a on. In these projects the injection nozzle 423c forming an annular gap 443c into it. In the example of 1a . 1b The roving is thus the mixing head 40 over the first channel 418 supplied, occurs in the region of the annular gap 443c into the mixing chamber 430f a, goes through the inlet funnel 443a and enters via the exit channel 443b again from the mixing head. It is done while passing through the inlet funnel 443a a radially comprehensive wetting with the over the annular gap 443c usually supplied under pressure reactive mixture 80 the reaction components. This finally causes on the way through the in the 1a . 1b only partially shown outlet channel 443b a complete impregnation of the roving with the reaction components. The roving then emerges from a nozzle, also not shown, from the mixing head 40 so that the reactive mixture without the risk of bonding with surrounding components free to cure the desired plastic and thus can bake the first fibrous roving to the desired strand-shaped composite material.

According to the invention, therefore, the homogenization of the two reaction components to the reactive mixture 80 in an area of the mixing chamber separate from impregnation of the roving with this reactive mixture 430f instead of. In the in the 1a . 1b The example shown is the reactive mixture 80 by swirling the approximately orthogonal to each other in the mixing chamber 430f injected reaction components 60 . 70 educated. This area is located approximately around the injection nozzle 423c and is roving through these 50 separated. Only then and in particular spatially separated from it begins the phase of wetting and impregnation of the out of the outlet 419 exiting rovings 50 in the annular gap 443c and the inlet funnel 443a , and is completed with the complete run of the roving 90 through the exit channel 443b , Hereby, an intensive saturation of the roving can be achieved with a homogeneous homogeneous mixture of the reaction components.

In another, in the 1a . 1b already illustrated embodiment of the invention, the mixing head 40 a sliding piston 42 on. At its lower end 423b are the injection nozzle 423c with the first outlet 419 for the roving 50 arranged. In the example of 1a . 1b is in the piston 42 also the second channel 420d for the first reaction component 60 guided. This opens via the outlet opening 420e also at the bottom 423b of the piston 42 into the mixing chamber. Preferably, mixing chamber 430f , Injection nozzle 423c and inlet funnel 443a rotationally symmetric about the axially located in the center channels 418 and 443b be executed. In this case, it is advantageous if the channel 420d is designed in the form of sub-channels, which also open radially around the injection nozzle located around the center in the mixing chamber.

The in the 1a . 1b upper wall of the mixing chamber 430f becomes so through the protruding lower end 423b of the piston 42 formed, and is in a trough-shaped nozzle in the vertical direction 40a displaceable. 1a shows the active state of the mixing head 40 with opened mixing chamber 430f and retracted piston 42 , and 1b the blocking state of the mixing head 40 with closed mixing chamber 430f and advanced piston. To stop the mixing flask 40 is the piston 42 over the end 423b completely into the mixing chamber 430f insertable.

The inlet funnel 443a is then from the injection nozzle 423c Completely filled in and the first outlet 419 for the roving 50 flows directly into the outlet channel 443b , Since the volumes of mixing chamber, annular gap and inlet funnel are reduced to the value zero in this state, no reactive mixture can 80 be formed from the two reaction components more. Thus, the impregnation of the roving and the formation of plastic come to a standstill. Advantageously, in such a shutdown, first the supply of the first reaction component can be interrupted. The residual volume of the mixing chamber 430f is then rinsed with the second reaction component, and the roving 50 goes through the channels untreated 418 . 443b , This will be explained in more detail below.

Finally, that for supplying the second reaction component 70 serving third outlet opening 430e inside the mixing chamber 430f be placed so that these with zurück- or advanced piston 42 is released or locked. Such an embodiment is in the example of 1a . 1b already shown. Due to the local side mouth of the channel 430d becomes its outlet opening 430e with retracted piston 42 - as in 1a shown - released, or with advanced piston 42 - as in 1b shown - locked.

Based on 2a . 2 B and 2c Below, further, particularly advantageous embodiments of the invention are explained in more detail:
In this particularly advantageous embodiment of the device according to the invention, the mixing head 40 a hollow needle 41 with a needle body 410 , a needle channel and a needle tip. The needle channel serves as the first channel 418 for feeding the roving 50 , and the needle tip as injection nozzle 423c with the first outlet 419 , Furthermore, the needle body 410 in one as a second channel 420d for the supply of the first reaction component 60 serving receiving channel 420d arranged.

The receiving channel 420d surrounds the needle body 410 in the manner of an annular channel, so that therein the first reaction component 60 the mixing chamber 430f axially around the needle point 423c is supplied around.

According to another, in the 2a to 2c already shown embodiment, it is advantageous if the injection nozzle 423c for the roving 50 Serving needle tip additionally in the form of a bead 417 is trained. The current of the first reaction component 60 , which via an annular outlet opening 420e at the end of the recording channel 420d is supplied, meets when entering the mixing chamber 430f on the bead 417 and is thus deflected radially outwards. As a result, an intensive turbulence of the reaction component 60 with the over the laterally opposite outlet openings 430e fed second reaction component 70 achieved. The resulting reactive mixture 80 then wets over the annular gap in the manner already described above 443c the roving 50 ,

The 2a respectively. 2c in turn show the shared active or locked disengaged state of the mixing head 40 , and thus correspond in principle to the 1a respectively. 1b ,

According to another, in the 2a to 2c also already shown embodiment, it is advantageous if the bead 417 has a cross section which is not smaller than the cross section of the receiving channel 420d is. Furthermore, the needle body 410 in the receiving channel 420 axially displaceable so that the second outlet opening 420e for the first reaction component 60 with the bead 417 in the width adjustable or lockable. Hereby, on the one hand, a precise dosage of the deliverable amount of the first reaction component can be achieved. Furthermore, but if the needle body 410 is completely withdrawn, including a complete shut-off of the first reaction component 60 be achieved. Such a condition is in the example of 2 B represented, in which in a particularly advantageous manner additionally the cross sections of bead 417 and recording channel 420d approximately agree. When retracting the hollow needle 41 then closes the bead 417 in the manner of a plug the receiving channel 420d Completely. The mixing chamber 430f can then with the only non-reactive second reaction component 70 be rinsed.

Based on 3 to 7 Below is an advantageous embodiment of a mixing head 40 explained in more detail. It shows 3 the cut through the entire mixing head while in the 4 to 7 the cooperating items of the mixing head are shown in detail. So shows 4 an advantageous embodiment of a hollow needle 41 which is inside a sliding piston 42 as shown by 5 is stored. The sliding piston 42 again engages in a 6a exemplified nozzle sleeve 43 forming a variable mixing chamber 430f one. A cross section through the nozzle sleeve 43 in the area of the mixing chamber 430f and the channels 430d for the second reaction component is in 6b shown. 7 finally shows a removable nozzle head 44 at the bottom of the mixing head 40 on the nozzle sleeve 43 is pluggable.

So shows 4 on average, a preferred embodiment of a hollow needle 41 , This hollow needle 41 The roving is via a supply line 141 on an annular head piece 411 supplied, and inside via the first channel serving as a needle channel 418 to the outlet 419 directed. In this area, the needle body 410 - As already described above - a thickened bead 417 on. At the in 4 illustrated embodiment, the needle body 410 also three areas 412 . 414 and 416 with decreasing cross sections, with the regions around the areas 414 and 416 at the same time as a second channel 420d serves for the first reaction component. This channel forms are off when the hollow needle 41 into a canal 420 inside the sliding piston 42 is inserted. A preferred embodiment of such a piston 42 is in 5 shown.

5 can be seen that the channel 420 in the axis of the piston 42 also advantageously has different channel areas with different cross-sections. So is a first channel area 420a with sealing rings 421c present, which is the upper area 412 of the needle body 410 caulk. The cross sections of the adjoining channel areas 420c . 420d are larger than the cross sections of the areas 414 . 416 of the needle body. It thus forms between the hollow needle 41 and the sliding piston 42 in these areas of an annular channel, which in section the 3 is clearly visible. This is used for the supply of the first reaction component, in particular of isocyanate. This becomes the channel area 420c of the piston 42 over a line 142 and a side introduction 421d supplied with sealing plugs. Another line 144 with lateral introduction 421f with sealing plugs can be used for recirculation of the first reaction component. The first reaction component is in the manner already described above in this channel to the outlet opening 420e at the bottom 423b of sliding piston 42 directed. As already with the example of the 2c explains, the hollow needle 41 from 4 be withdrawn so far that the bead 417 the channel area 420d completely fills and in this way the supply of the first reaction component is interrupted. Furthermore, by a position control of the hollow needle and the gap width of the outlet opening 420e predetermined, and thus the supply amount of the first reaction component can be adjusted.

The in 5 shown sliding piston 42 has three piston areas 421 . 422 . 423 with decreasing cross sections. When assembled, the piston areas come 422 . 423 in channel areas 430a . 430c of the receiving channel 430 inside the in 6a shown nozzle sleeve 43 to lie. Here again is the channel area 430a the nozzle sleeve with sealing rings 431b provided, which sealing on the lateral surface 422a of the second area 422 of the piston 42 intervention. The leaner area 423 of the piston 42 will be in the second channel area 430c the nozzle sleeve 43 guided. In this case, depending on the state of displacement of the piston in the region of the lower end of the nozzle sleeve is formed 43 a volume adjustable mixing chamber 430f out. 6b shows a section through the nozzle sleeve 43 in the area of the variable mixing chamber 430f ,

The mixing chamber becomes the second reaction component 70 , especially polyol, via lateral guide channels 430d in the second channel area 430c the nozzle sleeve 43 and slit-like outlet openings 430e preferably supplied radially. This is in the 6a . 6b shown in detail. The nozzle sleeve 43 becomes the second reaction component 70 via a supply line 143 with feeder 431e and sealing plugs in the first area 431 supplied laterally. Again, another line 145 with lateral introduction 431e be used with sealing plug for recirculation of the second reaction component. Inside the nozzle sleeve 43 is the second reaction component via an annular channel the lateral guide channels 430d fed. This one is in 3 can be seen and forms in the retracted state of the displaceable piston 42 out. The annular channel is limited in this state, on the one hand by an annular surface 422c at the transition between the areas 422 . 423 of the piston 42 , and on the other hand by a ring seat 430b at the transition between the channel areas 430a . 430b in the nozzle sleeve 43 ,

With retracted piston 42 the feeder flows 142 for the second reaction component directly into this annular channel, and can via the guide channels 430d and outlet openings 430e get to the mixing chamber. Again, this forms only in the retracted state of the piston 43 at the lower end of the canal area 430c out. This condition of the mixing piston is in the 1a . 2a . 3 and 8th shown.

As already explained, the piston 42 in the nozzle sleeve 43 be advanced so far that on the one hand, the supply of the second reaction component by obstructing the feed 143 over the lateral surface 422a of the piston is interrupted. On the other hand, in this way, the mixing chamber 430f be completely closed. In this condition, the ring surface lies 422c of the piston 42 on the ring seat 430b the nozzle sleeve 43 on. This condition is in the 1c . 2 B and 10 shown.

7 finally shows a nozzle head 44 , which on the head 433 the nozzle sleeve 43 is put on. The nozzle head 44 has a coat 440 with a preferably cylindrical inner recess 441 on. From the bottom surface 441a goes over an inlet funnel 443a an exit channel 443b which one in the head 443 extends to an exit opening. In this exit channel 443b For example, the complete saturation of the roving with the reactive mixture of the reaction components occurs as described above. After placing the nozzle head 44 on the head 433 the nozzle sleeve 43 is the second channel area 430c down through the floor area 441a limited, and thus at the same time the volume of the mixing chamber 430f closed down. When stopping the mixing head, the piston 42 advanced so far that the annular surface 423b at the lower end of the third piston area 423 on the floor surface 441a of the nozzle head 44 rests, and thus the mixing chamber is completely closed. Furthermore, the bead attacks 417 at the bottom of the hollow needle 41 in the manner already described above completely in the inlet funnel 443a one.

Finally, on hand of the 8th . 9 and 10 advantageous modes of operation of the exemplary mixing head of 3 to 7 explained. In this case, the streams of the two reaction components and the roving inside the mixing head are shown hatched for better understanding, while drawing-technical cut surfaces by machine-mechanical components of the mixing head form only not hatched areas.

So shows 8th the mixing head 40 - comparable to the 3 respectively. 1a . 2a in a working position, ie with open mixing chamber 430f , That's the hollow needle 41 supplied nuclear material 50 until reaching the outlet opening in the annular gap 443c characterized by a wide hatching. Furthermore, the over the feeders 142 . 143 introduced into the mixing head reaction components 60 . 70 highlighted by broken hatching. Finally, the reactive mixture 80 at symbolizes the reaction components in the mixing chamber by a cross-hatching, and the roving in the impregnated state 90 through a narrow hatching.

The systematic shutdown of the mixing head 40 in accordance with the method according to the invention is finally on hand of 9 . 10 explained.

So shows 9 the mixing head 40 in an intermediate state in which only the supply of the first reaction components is interrupted. 9 is thus in principle with 2 B comparable. According to the method according to the invention is for stopping the mixing head 40 in a first step, the supply of the first reaction component 60 , in particular isocyanate, in the mixing chamber 430f shut off. This is the hollow needle 41 inside the movable piston 42 pulled up so far that the outlet opening 420e is shut off. It can thus be formed in the mixing chamber no reactive mixture more. Instead, the mixing chamber 430f in a second step by sole supply of the second reaction component 70 , in particular polyol, rinsed. This is due to the broken hatching of the mixing chamber in 9 clearly visible. The supplied roving 50 Thus, it is impregnated only with polyol, and thus occurs in a only partially impregnated, no longer reusable condition 50a out of the nozzle head. This condition is in 9 characterized by a cross-hatching.

According to the method according to the invention, the supply of the second reaction component is now also in a third step 70 , in particular polyol, shut off and the mixing chamber 430f then completely closed. Now, in a fourth step, at least the fourth outlet opening 443b by temporary further supply of roving 50 getting cleaned. 10 shows the mixing head 40 in this almost silent state. 10 is thus in principle with the representations in 1b and 2c comparable. The supply of both reaction components is interrupted. The roving fed from above via the hollow needle 50 runs unchanged through the entire mixing head and thereby cleans the cavities. In a fifth and final step then the supply of the roving 50 finally be shut off.

1

mixing device

141

first feed for nuclear material (Roving)

142

second feed for first Reaction component especially isocyanate

143

third feed for second Reaction component esp. Polyol

144

first removal for first Reaction component especially isocyanate

145

second removal for second Reaction component esp. Polyol

40

mixing head

41

displaceable cannula

410

needle body

411

Headpiece, in particular annular

412

upper Area of the needle body

414

middle Area of the needle body

416

lower Area of the needle body

417

Needle point with bead around first exit opening 419

418

first Channel for Roving (needle channel)

419

first outlet opening for roving

42

shiftable piston

420

second Channel for Hollow needle and first reaction component

420a

first Channel area for upper portion of the needle body

420c

second Channel area for middle area of the needle body

420d

third Channel area for lower portion of the needle body

420e

second outlet opening for isocyanate

421

first piston area

421a

upper The End

421b

coupling recess

421c

seals

421d

first lateral introduction with sealing plugs

421e

first ring surface at the bottom

421f

second lateral introduction with sealing plugs

422

second piston area

422a

lateral surface

422b

first lateral introduction

422c

second ring surface at the bottom

422d

second lateral introduction

423

third piston area

423a

lateral surface

423b

lower End with third ring surface

423c

injection nozzle

40a

Nozzle from nozzle sleeve 43 and nozzle head 44

43

nozzle sleeve

430

receiving channel

430a

first channel region for the second piston region 422

430b

first ring seat for second ring surface 422c

430c

second channel area for third piston area 423

430d

lateral Guide channels for polyol

430e

third outlet opening or side slots for polyol

430f

variable mixing chamber

431

first sleeve region

431a

Ring seat for supporting the first ring surface 421e

431b

Sealing rings for engagement on lateral surface 422a

431c

lateral surface

431d

second lateral introduction with sealing plugs

431e

first lateral introduction with sealing plugs

432

second sleeve region

432a

Ring surface at the bottom The End

433

third sleeve region

433a

lateral surface

433b

Support ring

433c

Outlet opening for core material

44

nozzle head

440

coat

440a

Ring seat for supporting the ring surface 432a the nozzle sleeve 43

440b

Inner surface area

441

inner basin

441a

lower limit mixing chamber 430f , Pad ring surface 423b

443

head

443a

feed hopper

443c

annular gap

443b

outlet channel and impregnation zone

50

endless Plastic fiber strand as core material (roving)

50a

nuclear material impregnated with second reaction component (polyol)

60

first Reaction component, in particular isocyanate

70

second Reaction component, in particular polyol

80

reactive Mixture of both reaction components

90

end product impregnated with reaction components nuclear material

Claims (8)

Device for producing a strand-like composite material ( 90 ) from a roving ( 50 ), which is reacted with one of two reaction components ( 60 . 70 ), in particular with polyurethane, which has a mixing head ( 40 ) with a mixing chamber ( 430f ), characterized by - a first channel ( 418 ) for roving ( 50 ) via an injection nozzle ( 423c ) with a first outlet opening ( 419 ) of the mixing chamber ( 430f ), - a second or third channel ( 420d . 430d ) for the first or second reaction component ( 60 . 70 ), in particular isocyanate or polyol, with a second or third outlet opening ( 420e . 430e ), which are arranged so that the reaction components ( 60 . 70 ) in the mixing chamber ( 430f ) are preferably turbulently swirled, and - an outlet channel ( 443b ) for roving ( 50 ) with an inlet funnel ( 443a ) into which the injection nozzle ( 423c ) to form an annular gap ( 443c ) and the roving ( 50 ) therein with a homogeneous mixture of the reaction components ( 60 . 70 ) is soaked. Apparatus according to claim 1, wherein the second and third outlet openings (16) 420e . 430e ) are arranged so that the first or second reaction component ( 60 . 70 ) of the mixing chamber ( 430f ) approximately axially or radially to the roving ( 50 ). Apparatus according to claim 1 or 2, wherein the mixing head ( 40 ) a hollow needle ( 41 ) with needle body, needle channel and needle tip, wherein - the needle channel as the first channel ( 418 ) for roving ( 50 ), - the needle tip with the first outlet opening ( 419 ) as injection nozzle ( 423c ), and - the needle body ( 410 ) in a second channel for the first reaction component ( 60 ) receiving channel ( 420d ) is arranged so that this reaction component of the mixing chamber ( 430f ) axially around the needle tip ( 423c ) is supplied. Apparatus according to claim 3, wherein the injection nozzle ( 423c ) for roving ( 50 ) needle tip as a bead ( 417 ) is trained. Device according to claim 4, wherein - the bead ( 417 ) has a cross section which is not smaller than the cross section of the receiving channel ( 420d ), and - the needle body ( 410 ) in the receiving channel ( 420d ) is axially displaceable so that the second outlet opening ( 420e ) for the first reaction component ( 60 ) with the bead ( 417 ) of the needle tip ( 423c ) in the width is adjustable or lockable. Device according to one of the preceding claims, comprising - a displaceable piston ( 42 ), at the end ( 423b ) the injection nozzle ( 423c ) with the first outlet opening ( 419 ) for roving ( 50 ) are arranged, - a wall of the mixing chamber ( 430f ) through the end ( 423b ) of the piston ( 42 ) is formed, and - to shut down the mixing piston ( 40 ) The piston ( 42 ) over the end ( 423b ) completely into the mixing chamber ( 430f ) is insertable, so that the inlet funnel ( 443a ) from the injection nozzle ( 423c ) and the first exit opening ( 419 ) for roving ( 50 ) directly into the outlet channel ( 443b ) opens. Apparatus according to claim 6, wherein the third outlet opening ( 430e ) for supplying the second reaction component ( 70 ) in the mixing chamber ( 430f ) is placed in such a way that with the piston (or 42 ) is enabled or locked. Method for operating a device according to one of the preceding claims, wherein for immobilizing the mixing head ( 40 ) - in a first step, the supply of the first reaction component ( 60 ), in particular isocyanate, in the mixing chamber ( 430f ) is shut off, - in a second step, the mixing chamber ( 430f ) by sole supply of the second reaction component ( 70 ), in particular polyol, is rinsed, - in a third step, the supply of the second reaction component ( 70 ), in particular polyol, shut off and the mixing chamber ( 430f ) is completely closed, - in a fourth step, at least the fourth outlet opening ( 442 ) by feeding the roving ( 50 ), and - in a fifth step, the feeding of the roving ( 50 ) is shut off.