DE102007016352A1 - Multi-shaft extruder apparatus and method of operating the same - Google Patents

Abstract

The invention is based on a multi-shaft extruder device with a fiber strand feed unit (32b, 32c, 32d). It is proposed that the fiber strand feed unit (32b, 32c, 32d) has at least two fiber strand feeds (128, 130, 160-166, 252).

Description

State of the art

The The invention is based on a multi-shaft extruder device The preamble of claim 1. Furthermore, the invention is based on a method of operating a multi-shaft extruder device according to the preamble of claim 24.

From the publication DE 40 16 784 A1 an extruder device with a fiber strand feed is known, in which at one point of a housing, a fiber strand is fed via an insertion channel in an impregnating channel.

Of the The invention is in particular based on the object of providing a multi-shaft extruder device, the one very space-saving fiber strand feeder having. It is according to the invention by the Characteristics of claim 1 solved. Further embodiments result from the secondary and dependent claims.

Advantages of the invention

The The invention is based on a multi-shaft extruder device with a Faserstrangzuführeinheit.

It it is proposed that the Faserstrangzuführeinheit at least has two fiber strand feeds. This can be constructive simply an effective feed path of a fiber strand in shorten the multi-shaft extruder. Under a multi-screw extruder device here is an extruder device with two or more conveyor elements be understood. There may also be several fiber strands per fiber strand feed as fiber strand bundle be supplied. A fiber strand here either a single fiber such as a short glass fiber, a roving or a Endless fiber strand and / or another, the expert as meaningful appearing fiber strand.

Of It is further suggested that each fiber strand feed at least one transfer area is assigned. It can be beneficial a feed of each fiber strand via a separate one Faserstrangzuführöffnung in the extruder housing respectively. Here, a transfer area defines an area the Faserstrangzuführeinheit, directly into a Housing interior of the extruder housing opens.

advantageously, the transfer area is intended, at least one Supply fiber strand to a process room. This should be under a process room, the space of the multi-shaft extruder device be understood in which the fiber strands and / or a Are filled additive or can be mixed ge. An additive is either a thermoset or thermoplastic, a resin and / or another, the Professional appears to be useful additive. By this direct supply can be advantageously achieved that the fiber strand is supplied directly to the room, in it is mixed and / or coated with an additive. Of the Additive is preferably viscous and / or liquid in this area in front. It can be advantageous space, installation costs and Cost savings.

Further it is advantageous if the fiber strand feeds in a circumferential direction are arranged one after the other. This can the arrangement of fiber strand feeders especially place be carried out sparingly. Furthermore, the entire length of the multi-screw extruder are reduced because, for example, in Compared to a in a longitudinal extension of a Double extruder extending feed slot a reduction of a Feed area by the factor of the arranged fiber strand feed results. Generally, however, would be the arrangement of the fiber strand feeders along an axial longitudinal extent of the extruder housing possible.

Of Furthermore, it may be advantageous if the fiber strand feeds with a distance of at least ≥ 20 ° in the circumferential direction are arranged on an extruder housing, whereby the fiber strand feeds structurally simple around the circumference of the extruder housing can be arranged, as there is sufficient space given is. Particularly advantageous is the space, if the Fiber strand feeders with a distance of at least ≥ 30 ° in the circumferential direction arranged on an extruder housing are.

Further It is suggested that at least three, at least in the circumferential direction arranged conveying elements are provided. Through this Arrangement can high speeds of multi-shaft extruder device be achieved, the constructively simply a higher Material transport and a higher heat tolerance compared ensure a single screw. Under a conveyor element in particular, an element with a compression and / or Relaxation function with task to be understood. Advantageously, the arrangement of more than five and especially advantageous the arrangement of 12 conveyor elements, the like a ring assembly including a central region, can form.

If at least two conveying elements arranged in the circumferential direction are rotatably driven by the same direction of rotation with a motor, this can occur Part of a funding direction are set and maintained.

In a further embodiment of the invention is a core of enclosed in the circumferential direction of conveying elements is arranged. This can be structurally simple a good fixation and positioning of the conveying elements can be achieved. Furthermore, the core may be formed as a solid part and / or there can be channels for a temperature control in the Core may be introduced, which cool the multi-shaft extruder device if necessary. Furthermore, the core can also consist of several components.

moreover It is proposed that at least one conveying element at least partially enclosing extruder housing is arranged, wherein the extruder housing in the radial direction to the conveyor element to a guide clearance having a guide at least one fiber strand. By the Disposition of this area can be a defined channel of the fiber strand can be achieved. Here is the case preferably a cylinder, which is the conveying elements completely encloses radially.

A preferred development is that between a core and Conveying element arranged filling gap provided is, wherein in the filling gap an additive can be introduced is. This can be structurally simple a space to transport the Additive are formed.

It is also proposed that at least one conveying element by a rotational movement of the additive in the radial direction to Extruder housing transported, making constructively simple and space saving a removal of the additive from the Füllspalt in the guide clearance for coating the fiber strand can be achieved. Under radial direction should here the direction starting from a center point to an outer diameter be understood of the extruder housing.

Further it is advantageous if the conveying element as a return conveyor element is trained. This can be the Austransport of the additive from the filling gap in the guide clearance with a same drive, such as, the other conveyor elements in an axial conveying direction drives.

Under Return conveyor elements are here conveying elements be understood, the opposite slope in relation on the arranged for example in the conveying area conveyor elements exhibit.

Of Further, it is suggested that an axis along which an input area and a wetting area are provided, whereby a simple and inexpensive construction can be realized can. Conveying elements of these two areas are hereby operated with the same drive.

advantageously, a preimpregnating device is arranged to do this is provided, fiber strands before a feeder the fiber strands in at least one Faserstrangzuführeinheit to impregnate. This can be structurally simple and inexpensive an efficient pre-coating can be realized.

Further it is advantageous if the multi-shaft extruder device a has widened extruder housing section, the one widened radial distance to the extruder housing between at least one delivery element outer diameter and an inner wall of an extruder housing opposite to one further extruder housing section has. Through this widened area can provide optimal coating of the fiber strands achieved at the same time remaining intact fiber strands become.

Further It is suggested that the widened extruder housing section is arranged in the region of the fiber feed unit. Thereby can even fiber strands, which are fed on top of each other, be efficiently and completely coated.

In Another embodiment of the invention proposes that the widened extruder housing section after the Fiber strand feeding unit by a distance 3 to 6 times corresponds to a delivery element outer diameter, extends in an axial conveying direction. Thus, too a last fed fiber over a sufficient long area to be coated.

Of Further, it may be advantageous if a Radialabstandsreduzierung is provided, which is stepped or conical. Is this between the extruder housing and one inside arranged conveying element running, can a Gentle transition between two extruder housing sections be achieved, the fiber strands damage can happen. Under a radial distance reduction should in this case in a cylindrical extruder housing a narrowing of the diameter can be understood.

A structurally simple division of the fiber strands can advantageously be achieved if at least one conveying element arranged in a discharge and conveying region is provided which divides the fiber strands at least into predetermined lengths. As a result, the configuration of a geometry specially shaped for a base process, for example in the form of a sharp cutting edge, on an inner wall of the extruder housing It is arranged, cost-saving avoided.

moreover it is proposed that a loading unit be provided, the preimpregnated cut fibers prior to feeding a fiber strand in the Faserstrangzuführeinheit at least one fiber strand applies, and further that the pre-impregnated Cut fibers with the fiber strand in the Faserstrangzuführeinheit can be introduced. A built by the conveyor elements Pull acting on the fiber strands can be so constructively simple, Space and components saving for easier transport the cut fibers are used in the multi-shaft extruder device.

A preferred development is that at least one conveyor element unit is provided by the at least two conveying elements can be summarized to a functional unit. Thereby can the conveying elements are grouped together, the perform different functions in the same cross-sectional area can. Furthermore, each group may have a fiber strand feed be associated with, here, for example, the speeds and / or Temperature tolerances of the conveyor element unit to the supplied Fiber strand can be tuned. Thereby no one use spectrum of the multi-shaft extruder device.

It is also proposed that at least one conveying element position is arranged, which is intended to be as conveyor elementless Empty positions to be executed. By this configuration the range of applications is further increased. The empty positions For example, other functional parts, such as Cooling elements, Trennfüllstücken and / or from other functional parts that appear to the person skilled in the art, filled out.

Of Furthermore, the invention of a method for operating a Multi-shaft extruder device with a fiber strand feed unit out.

It It is suggested that at least two locations of an extruder housing Fiber strands fed into a process room become. This can structurally simple an effective feed of a Fiber strand are shortened in the multi-shaft extruder.

advantageously, The fiber strands are in a guide clearance one at least one conveying element at least partially enclosing extruder housing extending in radial Direction extends to the conveyor element, guided.

Further It is advantageous if an additive in one between a Core and at least one conveying element arranged Füllspalt is introduced.

In In a further embodiment of the invention, the fiber strands in at least one conveying element of a discharge and conveying area divided into predetermined lengths.

drawing

Further Advantages are shown in the following description of the drawing. In the drawing is an embodiment of the invention shown. The drawing, the description and the claims contain numerous features in combination.

Of the A person skilled in the art expediently also the features individually consider and summarize to meaningful further combinations.

It demonstrate:

1 a longitudinal section through a multi-screw extruder according to the invention,

2 a cross-section II-II 1 .

3 a schematic representation of a portion of the multi-screw extruder according to 1 .

4 a cross section through another inventive multi-screw extruder with 12 conveyor elements,

5 a cross section through a conveyor element,

6 a cross section through an alternative multi-shaft extruder according to the invention with 4 fiber strand feeders,

7 a cross section through another inventive multi-screw extruder with empty positions,

8th a schematic representation of a Vorimprägniervorrichtung,

9 a schematic representation of a portion of another multi-shaft extruder with a conically executed Radialabstandsreduzierung,

10 a schematic representation of a portion of another multi-shaft extruder with an endless fiber strand feed and

11 a detailed view of the Faserstrangzuführeinheit 10 in a plan view.

Description of the embodiment

In 1 is a multi-screw extruder 10a shown in the embodiment of a twin-screw extruder. The twin-screw extruder has an extruder housing 12a on, the two conveyor lines 44 . 46 each with several along an axis 18 of the extruder housing 12a one behind the other extending conveyor elements 14a . 48 . 50 . 52 . 54 . 56 . 62 . 218 , respectively. 16a . 64 . 68 . 98 . 100 . 106 . 112 . 220 and / or other conveying elements for melting, mixing, shearing, cutting and / or redirecting conveying materials, such as a kneading block 58 . 66 , encloses. The conveyor elements 14a . 16a . 48 . 50 . 52 . 54 . 56 . 62 . 64 . 68 . 98 . 100 . 106 . 112 . 218 . 220 the conveyor lines 44 . 46 are arranged in pairs combing, so that, for example, the vertically superposed conveyor elements 14a and 16a mesh with each other and with a same sense of rotation 60a from an unillustrated engine having a reduction and / or branching gear, with a specific engine torque of at least 20 Nm / cm ³ , preferably 40 Nm / cm ³ and more preferably 60 Nm / cm ^{3 are} operated (see 2 ). The conveyor elements 14a and 16a are preferably executed tightly combing, wherein the distance between a screw comb and a screw base is greater and / or equal to 4 mm.

Along the axis 18 include the conveyor lines 44 . 46 at least one input area 20a , a wetting area 22a and a discharge and conveying area 24a ,

At the input area 20a is an additive feed unit 26a arranged over which an additive 28a , such as a plastic, the conveyor elements 48 . 68 of the input area 20a is supplied. The additive 28a is by means of the conveying elements 48 . 68 the conveyor lines 44 . 46 in the direction of an axial conveying direction 74a to conveyor elements 62 . 64 transported. These serve to build up pressure in the axial conveying direction 74a and ensure a transition into kneading blocks 58 . 66 where the additive 28a is melted. In a viscous state is now the additive 28a along the axis 18 transported to an area in which each conveyor line 44 . 46 a return element 70a . 72 is arranged. The return elements 70a . 72 direct the additive 28a in the axial conveying direction 74a in a process room 76 a conveyor zone 30a that have a viscous workspace 78 and the beginning of the wetting area 22a represents.

In this viscous workspace 78 via a Faserstrangzuführeinheit 32a the feeding of a fiber strand 34a in which a fiber strand can be understood as meaning either a single fiber, such as a short glass fiber and / or an endless fiber, such as a roving. Shown here is a side dosing with two screw elements to a supply of chopped fibers. In general, a supply of endless fiber strands by means of a Zuführgatters would be possible here. The fiber strand feed unit 32a has a fiber strand addition opening 80a on, which has a longitudinal extent of about 1.5 times the length of Förderelementaußendurchmessers 82 Has. Here, the Förderelementaußendurchmesser refers 82 each on a arranged in the respective region of the conveying element and in the case of the fiber strand addition opening 80a on the conveyor elements 14a and 16a ,

In the area 84 the fiber strand addition opening 80a is a radial distance 86 between a conveyor element outer diameter 82 a conveying element 14a . 16b the conveyor zone 30a and an inner wall 88 of the extruder housing 12a towards at least one other area 90 enlarged (see 2 and 3 ). In the process room 76 the conveyor zone 30a become the fiber strand 34a and the additive 28a to a fiber strand additive mixture 92 mixed, the 30% to 80%, preferably 50% of the process space 76 fills. A remaining space becomes 70% to 20%, preferably 50%, with a gas volume 94 filled, which is entrained in the fiber strand feed and preferably consists of air. In 2 are the fiber strand additive mixture 92 and the gas volume 94 schematically for a partial section of the process space 76 shown. A volume ratio of fiber strand additive mixture 92 to gas volume 94 is by means of a unit 96 adjusted, either the amount of fiber strands supplied 34a and / or the amount of additive added 28a established.

In the direction of the axial conveying direction 74a joins the conveyor zone 30a a first compression zone 36 with two vertically arranged double-flighted conveying elements 50 and 98 on, which has a longitudinal extent of about 0.5 times the length of the Förderelementaußendurchmessers 82 and have a Kompri mierungsfunktion. By means of the first compression zone 36 becomes the gas volume 94 about a cross-section reduction by a small selected screw pitch and thus an increase in pressure from the process room 76 squeezed out and the gas volume 94 is thus reduced by at least a quarter of its volume. The gas volume is preferred 94 reduced by half, and more preferably by its entire volume. Alternatively, the gas volume reduction can also be reduced by changing a pitch of a worm gear.

In the axial conveying direction 74a joins in the first compression zone 36 a degassing zone 38 with two vertically arranged double-flighted conveying elements 52 and 100 on, which has a longitudinal extent of about 2 times the length of the Förderelementaußendurchmessers 82 have and the opposite to the conveyor elements 50 and 98 have a higher pitch of the flights and thus have a relaxation function. At this degassing zone 38 is a housing degassing opening 102 arranged over which a vacuum source 104 to the extruder housing 12a for establishing and / or maintaining a vacuum for reducing the gas molecules in the process space 76 can be created. It would also be possible only to apply an atmospheric pressure for degassing.

For a complete squeezing of the gas volume 94 is in the direction of the axial conveying direction 74a another compression zone 40 with two vertically arranged single-action conveyor elements 54 and 106 arranged, which has a longitudinal extent of about 0.5 times the length of the Förderelementaußendurchmessers 82 have a compression function and fer ner have an influence on the fiber length. Again, the squeezing of the gas volume 94 achieved by a very strong cross-section reduction.

In the axial conveying direction 74a joins the further compression zone 40 another degassing zone 222 with two vertically arranged double-flighted conveying elements 218 and 220 on, which has a longitudinal extent of about 2 times the length of the Förderelementaußendurchmessers 82 have and the opposite to the conveyor elements 54 and 106 have a higher pitch of the flights and thus have a relaxation function. At this further degassing zone 222 is a housing degassing opening 224 arranged over which the vacuum source 104 to the extruder housing 12a can be created

In the direction of the axial conveying direction 74a after the further compression zone 40 is a homogenization zone 42 0.5 times the length of the outer diameter of the impeller 82 corresponds, arranged. The homogenization zone 42 may be at most 3 times the length of the outer diameter of the impeller 82 correspond. In conveyor element areas 108 . 110 the homogenization zone 42 , which are arranged vertically one above the other, are passage areas 114 . 116 formed, which is a mass transfer between at least two device areas 118 . 120 enable. Here are the conveyor element areas 108 . 110 in the passageways 114 . 116 a distance between the screw crest and the screw root, which is greater and / or equal to 4 mm. By the mass transfer is a uniform wetting of the fiber strand 34a through the additive 28a allows.

To the homogenization zone 42 that is also the end of the wetting area 22a represents, closes in the axial conveying direction 74a the discharge and conveying area 24a on, in the conveying elements 56 . 112 extend. The discharge and delivery area 24a but can still up to a maximum length of 6 times the length of Förderelementaußendurchmessers 82 extend.

Along a longitudinal extent of the multi-shaft extruder in the axial direction 74a is also the arrangement of several Faserstrangzuführeinheiten 32a for supplying different types of fiber strand, such as ductile, tough and / or brittle fiber strands 34a , possible. Here, the arrangement of the Faserstrangzuführeinheiten 32a targeted to the type of fiber strand 34a be matched. If a supply of brittle chopped fibers, a Seitendoosagaggregat, as in 1 shown to be used. If ductile cut fibers are fed, a side dosing unit can be used in the area of the kneading blocks 58 . 66 done because the ductile fiber strands 34a the load of the kneading block 58 . 66 can withstand and / or can be impregnated equally efficiently. Furthermore, the supply of ductile fiber strands via a Seitentosieraggregat 34a as cut fibers in the area of the kneading blocks 58 . 66 take place and then in the axial conveying direction, the supply of a brittle fiber strand 34g in the form of a continuous strand over a fiber strand feed unit 32g with a gate 190 (please refer 10 ).

4 shows an alternative multi-screw extruder 10b in a cross section in the form of a ring extruder 122 with 12 in the circumferential direction 124 distributed conveying elements 14b . 16b . 126 of which only three have been provided with reference numerals for the sake of clarity. The arranged in a closed pitch conveying elements 14b . 16b . 126 are from an extruder housing 12b enclosed and all point the same direction 60b on. With regard to features and functions that remain the same, reference is made to the description of the exemplary embodiment in FIGS 1 to 3 directed. The following description is essentially limited to the differences from the exemplary embodiment in FIGS 1 to 3 , At the extruder housing 12b is a fiber strand feed unit 32b with two fiber strand feeders 128 . 130 in a circumferential direction 124 successively, arranged at an angular distance of 180 °. The fiber strand feeders 128 . 130 are at the same axial height of the extruder housing 12b arranged, but it would also be an axially offset arrangement possible. Every fiber strand feeder 128 . 130 has a fiber strand addition opening 80b and an over transfer area 132 . 134 in which by the fiber strand feeders 128 . 130 fed fiber strands 34b an outer process space 136 be supplied.

The process room 136 provides a leadership freedom 138 for guiding at least one fiber strand 34b where the guide clearance 138 in a radial direction 140 between the conveyor elements 14b . 16b . 126 and the extruder housing 12b is formed.

The conveyor elements 14b . 16b . 126 close a core 142b in and in the radial direction 140 between the core 142b and the conveyor elements 14b . 16b . 126 is a filling gap 144 arranged, which has an inner process space 146 forms. In the sen filling gap 144 is about the additive supply unit 26b an additive 28b , such as a plastic introduced. The core 142b can for a temperature of the system at least one cooling channel 210 have, at least partially in the axial direction 74b extends.

In 6 is an alternative multi-screw extruder 10c as a ring extruder 158 with a fiber strand feed unit 32c with four at an angular distance of 90 ° around the circumference of the extruder housing 12c distributed fiber strand feeders 160 . 162 . 164 . 166 each with a fiber strand addition opening 80c shown. With regard to features and functions that remain the same, reference is made to the description of the exemplary embodiment in FIGS 1 to 5 directed. The following description is essentially limited to the differences from the exemplary embodiment in FIGS 1 to 5 , On at least one fiber strand feeder 160 . 162 . 164 . 166 is a loading unit 168 arranged, the precoated cut fibers 170 before feeding a fiber strand 34c in the fiber strand feeder 160 of the fiber strand 34c applies. The cut fibers 170 be with the fiber strand 34c in the fiber strand feeder 160 brought in.

In 7 is another multi-screw extruder 10d as a ring extruder 172 shown. With regard to features and functions that remain the same, reference is made to the description of the exemplary embodiment in FIGS 1 to 6 directed. The following description is essentially limited to the differences from the exemplary embodiment in FIGS 1 to 6 , In the extruder housing 12d are radially around a core 142d 12 conveyor element positions 174 arranged, of which ten with conveyor elements 14d . 16d are filled and two empty elements as conveyor element empty 176 . 178 are executed. However, it can also be any number, combination and / or sequence of conveying element-carrying and conveyor element-free conveying element positions 174 be provided. The empty positions 176 . 178 extend at least from the area of the fiber supply unit 32d and preferably from the input area 20 up to the discharge and conveying area 24 and are filled with Trennfüllstücken. By arranging the Trennfüllstücke from the input area 20 can be an input of various additives 28 carried out, which can be transported separately by the Trennfüllstücke. If the Trennfüllstücke only in the axial direction of conveyance 74 after the fiber strand addition unit 32d arranged, the flow of the molten additive 28 proportionally directed into areas formed by the Trennfüllstücke. At least two conveying elements 14d . 16d can as a functional unit or as a conveying element unit 180 be summarized.

Furthermore, a fiber strand 34d and the additive 28 by the arrangement of Trennfüllstücken in the empty positions 176 . 178 in the circumferential direction 124 in separate conveyor element units 180 be transported.

In 8th is a pre-impregnation device 182 with a coating unit 184 for preimpregnating at least one fiber strand 34e by means of an additive supply unit 26e with an additive 28e and a feeder unit 186 that the fiber strand 34e a fiber strand feed unit 32e an extruder device not shown in detail, shown. Here, the coating takes place before feeding the fiber strand 34e in the extruder device. The additive 28e , preferably a plastic, is formed as a film by means of at least one applicator in the form of a nozzle 188 on the fiber strand 34e applied. An improvement of the coating is on the coating unit 184 at least one moving device in the form of a gate 190 arranged over which the fiber strand 34e before passing the nozzle 188 to be led. The gate 190 moves the fiber strand (s) supplied 34e oscillating in the process of applying the additive. The feeder unit 186 includes a first guide element 192 and a second guide element 194 both of which are the fiber strand 34e to lead. Because of the fiber strand 34e by a tension generated by the extruder device under tension on the guide elements 192 . 194 is passed and the additive 28e on the second guide element 194 between the fiber strand 34e and a workspace 196 of the second guide element 194 is located, the second guide element works 194 the additive 28e additionally in the fiber strand 34e one. Further, by this passing and the exercise of a sliding pressure on the fiber strand 34e , adhering to the fiber strand or in the additive 28e contained gas squeezed out. After the second guide element 194 is a diverter unit 216 arranged that the fiber strand 34e about another guide element 228 the fiber strand feed unit 32e supplies. On all guiding elements 194 . 196 . 228 or at the leading part 230 the deflecting element is a spoiler edge 226 molded, which ensures that the additive film with the fiber strand 34e is transported. Furthermore, a heat source 198 For example, in the form of at least one in the guide elements 194 . 196 . 228 . 230 introduced th heating jet, arranged, which is the supplied and coated fiber strand 34e before feeding into the Faserstrangzuführeinheit 32e heated.

In 9 is a schematic section of a conveyor line 200 with at least two conveying elements 202 . 204 another multi-screw extruder 10f shown. With regard to features and functions that remain the same, reference is made to the description of the exemplary embodiment in FIGS 1 to 7 directed. The following description is essentially limited to the differences from the exemplary embodiment in FIGS 1 to 7 , An extruder housing 12f has an extruder housing section 206 on top of the fiber strand feed unit 32f and their fiber strand addition opening 80f is arranged and extending by a distance 3 times a Förderelementnaußendurchmesser 82 corresponds, in an axial conveying direction 74f extends. Following this extruder barrel section 206 is another extruder housing area 208 arranged a transition 212 with a radial clearance reduction 256 has, which is conical. The further extruder housing area 208 turn goes into a discharge and promotion area 24f over, in which the one fragmentation unit 214 in the form of the conveying element 204 is arranged, which the fiber strands 34f divided into predetermined lengths.

In 10 is a schematic section of another multi-screw extruder 10g in the form of a ring extruder 232 shown. With regard to features and functions that remain the same, reference is made to the description of the exemplary embodiment in FIGS 1 to 9 directed. The following description will be limited essentially to the differences from the embodiment in the 1 to 9 ,

Along an axial conveying direction 74g is in an input area 20g a conveyor element 234 arranged, that of a promotion of an additive feed unit 26g introduced additive 28g serves. To the conveyor element 234 includes an area that has a filling gap 144 and an inner process area 146 forms. For this filling gap 144 becomes the additive 28g by means of a return element 70g , in the axial conveying direction 74g after the conveying element 234 is arranged, in the radial direction 140 to the extruder housing 12g in an outer process room 136 or management clearance 138 transported. In order to achieve a sufficient fiber strand feed, is in the range of a Faserstrangzuführeinheit 32g containing a fiber strand feeder 252 and a transfer area 254 a widened housing portion provided through which an extruder housing conveying element gap 152 is formed.

This extruder housing conveyor element gap 152 can additionally and / or alternatively by an embodiment of a conveying element 148 be formed. For this purpose, the conveying element 148 in one area, such as the fiber strand feed area, over another area, such as the wetting area 22g , a smaller ratio of the conveyor element outer diameter 82 (Da) to a conveyor element inner diameter 150 (Tues) (see 5 ).

Furthermore, a core segment 240 be provided, which has a widened diameter compared to the remaining part of the core 142g having.

Furthermore, an annular gap 154 , for example, arranged in the homogenization zone 42g and / or between two conveying elements 236 . 238 , which is designed without conveyor element, at least by a length of one third of the length of the Förderelementaußendurchmessers 82 extends and a radial channel height 156 of maximum (Da-Di) / 2.

The fiber strand feed unit serves to supply endless fiber strands and has at the fiber strand feed opening 80g a cylindrical insert 236 with a feed molding 244 and a retaining edge 246 on, wherein the feed molding 244 against the radial direction 140 in the case 12g extends. The use 242 also has a longitudinal slot 248 on, in which the fiber strands 34g be introduced. The use 236 can be at an angle of 0 ° to 45 ° to the conveying direction 74g staggered to be arranged. Vertically over the insert is a gate 190g arranged that the fiber strands 34g , each separated by gate webs 250 , the fiber feed unit 32g supplies. The gate 190 can be at an angle of 0 ° to 45 ° to the conveying direction 74g staggered, wherein a rotation of the gate 190 regardless of a rotation of the insert 242 can take place (see 11 ). Furthermore, the gate 190 in the vertical direction steplessly opposite the insert 242 be adjusted.

10

Multi-screw extruder

12

extruder barrel

14

impeller

16

impeller

18

axis

20

input Panel

22

Wetting area

24

Discharge and funding area

26

addition agent

28

additive

30

conveying zone

32

Faserstrangzuführeinheit

34

tow

36

first compression zone

38

degassing

40

Further compression zone

42

homogenization

44

conveyor line

46

conveyor line

48

impeller

50

impeller

52

impeller

54

impeller

56

impeller

58

kneading block

60

rotation

62

impeller

64

impeller

66

kneading block

68

impeller

70

Return element

72

Return element

74

axial conveying direction

76

process chamber

78

viscous Workspace

80

Fiber strand feed opening

82

Impeller outer diameter

84

Area

86

radial distance

88

inner wall

90

another Area

92

Fiber strand additive mixture

94

gas volume

96

unit

98

impeller

100

impeller

102

Gehäuseentgasungsöffnung

104

vacuum source

106

impeller

108

Impeller area

110

Impeller area

112

impeller

114

Passage area

116

Passage area

118

device region

120

device region

122

RingExtruder

124

circumferentially

126

impeller

128

Fiber strand feeding

130

Fiber strand feeding

132

Transfer area

134

Transfer area

136

outer process chamber

138

Guide space

140

radial direction

142

core

144

filling gap

146

inner process chamber

148

impeller

150

Impeller inside diameter

152

Extruder housing-impeller gap

154

annular gap

156

channel height

158

RingExtruder

160

Fiber strand feeding

162

Fiber strand feeding

164

Fiber strand feeding

166

Fiber strand feeding

168

feeding unit

170

chopped fiber

172

RingExtruder

174

Impeller position

176

short position

178

short position

180

Impeller unit

182

Vorimprägniervorrichtung

184

coating unit

186

feed

188

jet

190

oscillating gate

192

first guide element

194

second guide element

196

working surface

198

heat source

200

conveyor line

202

impeller

204

impeller

206

Extruder housing section

208

Extruder barrel range

210

cooling channel

212

crossing

214

slicing unit

216

deflecting

218

impeller

220

impeller

222

degassing

224

Gehäuseentgasungsöffnung

226

tear-off edge

228

guide element

230

leading part

232

RingExtruder

234

impeller

236

impeller

238

impeller

240

core segment

242

commitment

244

Zuführformteil

246

retaining edge

248

longitudinal slot

250

gate bridge

252

Fiber strand feeding

254

Transfer area

256

Radial Distance Reduction

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4016784 A1 [0002]

Claims (27)

Multi-shaft extruder device with a fiber strand feed unit ( 32b . 32c . 32d ), characterized in that the fiber strand feed unit ( 32b . 32c . 32d ) at least two fiber strand feeds ( 128 . 130 . 160 - 166 . 252 ) having. Multi-shaft extruder device according to claim 1, characterized in that each fiber strand feed ( 128 . 130 . 160 - 166 . 252 ) at least one transfer area ( 132 . 134 . 254 ) assigned. Multi-screw extruder device according to claim 2, characterized in that the transfer area ( 132 . 134 . 254 ) is provided, at least one fiber strand ( 34b . 34c . 34g ) a method room ( 136 ). Multi-shaft extruder device according to at least one of the preceding claims, characterized in that the fiber strand feeds ( 128 . 130 . 160 - 166 . 252 ) in a circumferential direction ( 124 ) are arranged one after the other. Multi-screw extruder device according to claim 4, characterized in that the fiber strand feeds ( 128 . 130 . 160 - 166 . 252 ) with a distance of at least ≥ 20 ° in the circumferential direction on an extruder housing ( 12b . 12c . 12g ) are arranged. Multi-shaft extruder device according to at least one of the preceding claims, characterized by at least three, at least in the circumferential direction ( 124 ) arranged conveying elements ( 14b . 16b . 126 ). Multi-shaft extruder device according to claim 6, characterized in that at least two in the circumferential direction ( 124 ) arranged conveying elements ( 14b . 16b . 126 ) with the same direction of rotation ( 60b ) are rotatable. Multi-shaft extruder device at least according to claim 6, characterized by a core ( 142b . 142d ), of the in the circumferential direction ( 124 ) arranged conveying elements ( 14b . 14d . 16b . 16d . 126 ) is included. Multi-screw extruder device at least according to claim 6, characterized by at least one conveying element ( 14b . 16b . 126 . 148 . 202 . 204 . 234 - 238 ) at least partially enclosing extruder housing ( 12b . 12f . 12g ), wherein the extruder housing ( 12b . 12f . 12g ) in the radial direction ( 140 ) to the conveying element ( 14b . 16b . 126 . 148 . 202 . 204 . 234 - 238 ) a guidance free space ( 138 ) to a guide of at least one fiber strand ( 34b . 34f . 34g ) having. Multi-shaft extruder device according to claims 6 to 9, characterized by an intermediate core ( 142b . 142d . 142f . 142g ) and conveying element ( 14b . 14d . 16b . 16d . 126 . 148 . 202 . 204 . 234 - 238 ) arranged filling gap ( 144 ), wherein in the filling gap ( 144 ) an additive ( 28b . 28d . 28g ) can be introduced. Multi-screw extruder device according to claim 10, characterized in that at least one conveying element ( 70g ) by a rotary movement the additive ( 28g ) in the radial direction ( 140 ) to the extruder housing ( 12g ). Multi-screw extruder device according to claim 11, characterized in that the conveying element as a return conveyor ( 70g ) is trained. Multi-shaft extruder device according to at least one of the preceding claims, characterized by an axis ( 18 ) along which an input area ( 20a . 20g ) and a wetting area ( 22a . 22b . 22g ) are arranged. Multi-screw extruder device according to at least one of the preceding claims, characterized by a pre-impregnation device ( 182 ), which is intended to 34e ) before feeding the fiber strands ( 34e ) in at least one fiber strand feed unit ( 32e ) to impregnate. Multi-screw extruder device according to at least one of the preceding claims, characterized by a widened extruder housing section ( 84 ), which has a widened radial distance ( 86 ) to the extruder housing ( 12a ) between at least one conveyor element outer diameter ( 82 ) and an inner wall ( 88 ) of an extruder housing ( 12a ) with respect to a further extruder housing section ( 90 ) having. Multi-screw extruder device according to claim 15, characterized in that the widened extruder housing section ( 84 ) in the area of the fiber strand feed unit ( 32a ) is arranged. Multi-screw extruder device according to claim 16, characterized in that the widened extruder housing section (FIG. 84 . 206 ) after the fiber strand feed unit ( 32b . 32f ) by a distance 3 to -6 times a Förderelementaußendurchmesser ( 82 ) corresponds, in an axial conveying direction ( 74b . 74f ). Multi-shaft extruder device according to at least one of the preceding claims, characterized in that a Radialabstandsreduzie tion ( 256 ) is provided, which is stepped or conical. Multi-screw extruder device according to at least one of the preceding claims, characterized by at least one in a discharge and delivery area ( 24f ) arranged conveying element ( 204 ), the fiber strands ( 34f ) at least divided into predetermined lengths. Multi-screw extruder device according to at least one of the preceding claims, characterized by a loading unit ( 168 ), the preimpregnated cut fibers ( 170 ) before feeding a fiber strand ( 34c ) into the fiber strand feed unit ( 32c ) on at least one fiber strand ( 34c ). Multi-screw extruder device according to claim 21, characterized in that the preimpregnated cut fibers ( 170 ) with the fiber strand ( 34c ) into the fiber strand feed unit ( 32c ) can be introduced. Multi-shaft extruder device at least according to claim 6, characterized by at least one conveyor element unit ( 180 ) by the at least two conveying elements ( 14d . 16d ) are summarized into a functional unit. Multi-shaft extruder device according to claim 22, characterized by at least one conveying element position ( 174 ), which is intended to be used as conveyor elementless empty positions ( 176 . 178 ) to be executed. Method for operating a multi-shaft extruder device with a fiber strand feed unit ( 32b . 32c . 32g ) according to at least one of the preceding claims, characterized in that at least two locations ( 128 . 130 . 160 - 166 . 252 ) of an extruder housing ( 12b . 12c . 12g ) Fiber strands ( 34b . 34c . 34g ) into a procedure room ( 136 ). A method according to claim 24, characterized in that the fiber strands ( 34b . 34f . 34g ) in a management space ( 138 ) of at least one conveying element ( 14b . 16b . 126 . 148 . 202 . 204 . 234 - 238 ) at least partially enclosing extruder housing ( 12b . 12f . 12g ) extending in the radial direction ( 140 ) to the conveying element ( 14b . 16 . 126 . 148 . 202 . 204 . 234 - 238 ). Multi-screw extruder device according to claims 24 and 25, characterized in that an additive ( 28b . 28f . 28g ) into one between a core ( 142b . 142d . 142f . 142g ) and at least one conveying element ( 14b . 14d . 16b . 16d . 126 . 148 . 202 . 204 . 234 - 238 ) arranged filling gap ( 144 ) is introduced. Method according to at least one of the preceding claims, characterized in that the fiber strands ( 34f ) in at least one conveying element ( 204 ) of a discharge and promotion area ( 24 ) are divided into predetermined lengths.