WO2011101292A1

WO2011101292A1 - Method for producing a body having rigid angles

Info

Publication number: WO2011101292A1
Application number: PCT/EP2011/052029
Authority: WO
Inventors: Oliver Dohnke; Jens GRÜTZMACHER; Jens Ringel; Gernot Swiatkowski
Original assignee: Siemens Aktiengesellschaft
Priority date: 2010-02-16
Filing date: 2011-02-11
Publication date: 2011-08-25
Also published as: DE102010008633A1

Abstract

The invention relates to a method for producing a body (15) having rigid angles, which uses a sized elongate fiber (1, 2, 3) embedded in a fluid to be cured. The sizing of the fiber (1, 2, 3) is first dissolved by means of heat and the fiber is heated. The heated fiber is impregnated by the fluid and then the fluid having a web made of the fibers (1, 2, 3) placed therein is cured.

Description

description

The invention relates to a production method of a rigid-angle body using an elongated, sized fiber which is embedded in a liquid to be cured. It is known to coat fibers at the surface thereof with a Schlich ^¬ te. The sizing smoothes the surface of the fiber, making the fiber smoother and more resistant to mechanical stress. The size makes it difficult to prepare a solid Verbun ^¬ of between the fiber and the cured liquid. The bond between the fiber and the liquid to be cured is adversely affected by the size such that, after the liquid has cured, individual fibers are easily leachable out of the rigid-angle body or the stability of the rigid-angle body is impaired.

The object of the invention is therefore to provide a manufacturing method, in which an improved embedding the fiber allows trainees to dimensionally stable rigid angular body ^¬.

According to the invention the object is achieved in a manufacturing method of the type mentioned in that

- The sizing of the fiber is dissolved by thermal action and the fiber is heated, that

- The heated fiber is wetted with the liquid and that - The liquid cures rigidly with an embedded web of fiber.

A thermal desizing of the fiber makes it possible to remove the sizing from the fibers so far that a UNMIT ^¬ nent contacting major surface portions of the fiber with the cured liquid can take place. As a result, a cohesive bond between the hardened liquid and the fiber can be produced, as a result of which dissolution of the two is only possible with difficulty. A thermal desizing has the advantage that the sizing can be released relatively quickly from the fiber, wherein optionally also the use of chemicals such as acids, sulfates, enzymes o. Ä. Substances can be dispensed with. The sizing can be easily removed from the fiber. The sizing typically has nonvolatile components under standard conditions. These non-volatile Be ^¬ constituents are solved by the thermal desizing or removed. This avoids the emergence of process byproducts which have to be treated accordingly or further processed. Furthermore, it is advantageous to remove any moisture present in the fiber by means of a thermal desizing. Thus, on the one hand, the sizing is thermally removed and, on the other hand, the fiber is dried in the same section. Any moisture present in the fiber can be removed from the fiber. Thus, an angularly rigid body containing the fiber is nearly free of moisture inclusions after the liquid has cured. This can be done cost-effective production of the rigid-angle body. In the case of a thermal action on the size, the fiber also heats up, since this carrier material is the size. By heating the fiber can be wetted in an improved manner with the liquid, so that a possible all-sided and complete embedding or sheathing the fiber with the liquid can be done. When wetted, the tempering of the fiber favors adhesion of the liquid to the fiber. Until a final deposition of the fiber, a sufficient amount of liquid remains on / in the fiber.

In this case, a fiber is understood to mean an elongate thread-like body which is cross-sectionally small in comparison to its length and which is reversibly deformable. For example, a fiber may have a single strand or a composite of multiple strands.

After impregnation and wetting of the fiber with the liquid-sigkeit is carried out, this association of fiber and flues ^¬ sigkeit can be assembled into a web. The Ausges ^¬ taltung of the web can be done differently. For example, relatively short fibers can be made by overlapping, entangling and crossing the individual short fibers to a mat-like or felt-like webs, which is impregnated by the liquid. However, it can also be provided that an entanglement in the manner of a knitted or woven fabric with warp and Schussfä ^¬ of the fibers is provided, whereby a web is formed in the form of a sheet-like fiber mat, which due to the

Impregnation solidified with the liquid and a corresponding shaping and subsequent curing to a rigid body. In addition, it can also be provided that the fiber is designed in the manner of an endless fiber, ie, a fiber which is laid continuously for the production of the rigid body in the shape of the future molded body. In this case, a web can be formed, for example by winding the fiber onto a winding body. Advantageously, several layers of the fiber should match. be wound on the other, to obtain a stable wall of the angle ^¬ rigid body. Depending on the requirements of the auszuformenden body, a web may also be present before a final sizing and impregnation. This has the advantage that after a wetting of the fiber with the liquid mechanical loads on the fiber are limited.

The fiber should be wetted with the liquid after heating the sizing and fiber in a step immediately following heating. Thus, the generation of soils on the surface of the fiber can be prevented, which, like a size, would adversely affect the adhesion of the liquid to the fiber. It is particularly advantageous if the process of heating and desizing, the wetting and the shaping of the angle ^¬ rigid body is continuous. A continuous flow is particularly advantageous in the use of continuous fibers continuously pass through the individual process steps ^¬.

An advantageous embodiment may provide that the sizing is exposed to a temperature of about 250 ° C to 400 ° C, in particular 300 ° C. A temperature control of the size to about 250 ° C to 400 ° C ges ^¬ tattet to solve the sizing to a sufficient extent by the fiber. Such a temperature can be generated with a reasonable energy expenditure, wherein a destruction of the fiber, for example by charring the fiber in this temperature range is not expected. In particular, at a control temperature of 300 ° C., a particularly energy-efficient release of the size can be effected and the fiber is heated to a sufficient extent by the temperature of the sizing in order to be followed directly by a ner impregnation or wetting with the still to be cured liquid to be subjected.

An advantageous embodiment may provide that the fiber is washed around by a heated fluid to solve the sizing.

A flowing around the fiber with a fluid makes it possible to temper the Fa ^¬ ser all sides evenly on the circumference. The heat can penetrate all sides in the size and reach the top ^¬ surface of the fiber. This allows rapid soaking of the sizing and enables the largest possible release of sizing and fiber. Suitable fluids are, for example, liquids which flow around the fiber. Liquids have the advantage that in addition to a good heat transfer to the fiber and the sizing and a removal of the sizing of the spilled fiber can be done via the fluid flow. From the liquid medium, such as a water or an oil, an acid o. Ä., The sizing can be easily separated, so that the tempered fluid can be reused often.

Furthermore, it can be advantageously provided that the heated fluid is a gas.

A heated gas can attack the fiber in an improved manner due to the reduced molecular size compared to liquid fluids and also penetrate into small spaces between the fiber and the sizing and thus effect an intensive and rapid solution of the sizing of the fiber. Furthermore, due to the gaseous structure, the fiber remains free of buildup of the fluid. The detached sizing can, for example, be gravity-driven independently from the gas segregated fluid, so that the fluid is protected from contamination.

A further advantageous embodiment can provide that the fluid has a temperature of about 250 ° C to 400 ° C, ^{insbesond ¬} re 300 ° C.

As described above, it is advantageous to expose the sizing and the fiber to a specific temperature. In order to maintain this temperature, it is advantageous to apply a corresponding temperature to the fluid flowing around the fiber and to cause a certain heating of the sizing or of the fiber over the duration of the contacting of fluid and fiber. If the temperature of the fluid is set at the limits of the intended heating of sizing or fiber, overheating of the fiber and sizing is virtually eliminated. Thus, damage to the fiber or to the surface of the fiber can be avoided even with a longer retention of the fiber in the fluid.

Furthermore, it can be advantageously provided that the fiber is passed through a heating channel. A heating duct may comprise for example a specific abgeschlos ^¬ senes volume in which the fluid is maintained, by which the fiber is passed. Inner ^¬ half of the heating channel, a corresponding fluid flow he be ^¬ testifies. By the length of the heating channel and the throughput of the fiber occurs speed, ie the duration of the Verblei ^¬ bes the fiber with the sizing thereon and to be solved within the heating channel, a control is made of the thermal charge of the fiber and sizing. The heating channel may for example be a channel in which the gaseous fluid is present in a heated state. However, it may also be that the heating channel is designed in the manner of a tank, which is filled with a liquid fluid, wherein the fiber is passed through the tank. The fluid is there ^¬ tempered accordingly. An additional forced Stö ^¬ tion of the fluid supports a uniform temperature.

In a particularly simple variant, the fluid is atmospheric air as examples game which he will hitzt ^¬ by heating elements, wherein due to convection phenomena, a flow of the fluid is generated. The fiber is brought into the flow. To support the flow, the heating channel may have an input and an output through which the fiber is supplied or from which the fiber is removed from the channel. The fiber can also be introduced continuously through the inlet, passed through the heating channel and removed via the output of the heating channel. In addition, a mechanical acceleration of the fluid, for example, by fans, pumps o. Ä., Her ^{¬ be called} forth.

A further advantageous embodiment can provide that the fiber is placed on a heating element.

A heating element is a device which serves to deliver thermal energy. The heating element has ^¬ example, a heating plate, on which the fiber is laid. On the one hand, a direct contacting of the fiber and an immediate transfer of heat from the heating element to the fiber or to the sizing can take place. On the other hand, in addition to the heating element, a fluid flow can be caused, so that also areas of the fiber, which are not in direct contact with the heating element are exposed to a heated fluid stream. Such a fluid flow can be effected for example by a heating element whose heating plate is only partially covered by the fiber. Uncovered areas of the heating plate also heat the surroundings of the fiber. As a rule, the heating plate of the heating element will be larger than the surface of the heating element covered by the applied fiber, so that sufficient portions of the heating plate remain around the fiber, which can cause fluid flow around the fiber. In a simple case, the fluid flow can be caused by convection. It can be provided that the heating element is free in space under atmospheric conditions and the fiber rests on the heating element. However, it can also be provided that the heating element, for example, forms a heating channel in tunneling form, through which the fiber is moved through. This causes a more intense heating of the fiber.

An immediate contacting of the fiber with the heating element has the advantage that a guide and steering of the fiber takes place on the heating element directly. Additional bearings, for example, to guide the fiber spaced apart to a heating element, so are not necessary. A compliance geous before ^¬ temperature ranges can be caused by a corresponding regulation of the heating element. The Heizele ^¬ ment may also have a heating channel through which the fiber is passed through the heating element contacting. A further advantageous embodiment can provide that the fiber is placed in an arc shape on the heating element.

An arcuate course of the fiber makes it possible to increase the length of the fiber on the heating element over short distances. assign and thus heat larger sections of the fiber simultaneously with one and the same heating element. For example, it may be provided that the fiber is arranged in a meandering manner on the heating element. With an appropriate dimensioning of the heating plate of the heating element an all ^¬ sided heating of the fiber is possible.

Another possibility of a bow-shaped resting of the fiber on the heating element is to provide a curved shape of the heating element. The fiber follows the curved one

Course of the heating element. Also in this case, a Ver ^¬ enlargement of the heatable fiber length compared to a linear route is possible. In this case, also a plurality of arc-shaped portions ^¬ one or more heating elements may be arranged one behind the other, so that in a rise and fall be ^¬ züglich a vertical line, the fiber course of the arcs of the / of the heating element (s) follows.

A further advantageous embodiment can provide that the fiber is towed over the heating element.

To a certain temperature of the fiber or of the sizing effect, it is advantageous to move the fiber through the Heizele ^¬ ment itself away, that is to drag the fiber through the heating element. The fiber should follow the course of the heating element. In particular, in the case of a curved configuration of the heating element or the heating plate, which is in direct contact with the sized fiber, the fiber should rest on the curvature in order to have direct contact with the surface over a possibly large area

Keep heating element. In a tow of the fiber through the heating element, the fiber is hinwegbe ^¬ moved over the heating element, wherein a constant, continuous orientation of the fiber and possible heating element Kontak- is preferred. That's the way it is For example, it is possible that a continuous heating of the fiber can take place, wherein over the duration of an immediate contacting of the fiber with the heating element, the degree of temperature control of the fiber can be influenced. With a correspondingly large heating plate of the heating element and a more or less strongly curved towing path of the fiber, the duration of the contact ^¬ handover can be reduced between the heating element and fiber and at a reduced speed of the fiber tow through the heating element, the duration of the contact by increasing the speed increases and thus the heating of fiber and sizing are enhanced.

A further advantageous embodiment may provide that a heating element is moved synchronized with a movement of the fiber parallel thereto.

By synchronized movement of the heating element to a movement of the fiber, a relative speed between fiber and heating element is approximately 0 achievable. The friction between the moving fiber and the likewise moving heating element is reduced. The mechanical load of the Fa ^¬ ser is thereby low. By desizing the fiber, the fiber is initially adversely affected by its mechanical property. Moving the heating element in synchronization with movement of the fiber reduces the load on the fiber. In particular, in a time ^¬ point shortly before completion of the temperature control of the fiber and the sizing, to which the sizing has already been solved to a good part, it is advantageous to reduce the mechanical load on the fiber. In a continuous tempering and impregnation of the fiber, it is advantageous to use, for example, a drum-shaped heating element whose heating plate has the shape of a lateral surface of a circular cylindrical drum, wherein the drum rotates and at a sliding over the fiber over the drum, a temperature of the same takes place. It can also be provided that the fiber is exposed, for example, by one or more Um ^¬ wrap the lateral surface an increased residence time on the lateral surface and thus subjected to a correspondingly ^¬ tant tempering.

A further advantageous embodiment can provide that the desized and impregnated with the liquid fiber is applied to a mandrel and cures tubular.

Particularly in the case of continuous desizing and continuous impregnation of the fiber, the impregnated fiber can be applied continuously to a winding mandrel. In this case, depending on the shape of the fiber is possible to bring the same to the winding mandrel on a different ^¬. For example, when short fibers are used, it is possible to apply a multiplicity of comparatively short fibers to the mandrel in a disordered structure, resulting in a web of short fibers which harden on the mandrel embedded in the liquid to be cured. However, it can also be provided that the fiber is present in a knitted or woven fabric of warp and weft threads which have undergone a corresponding impregnation with the liquid, wherein application of this fabric to the winding mandrel leads to a tubular element. In this case, a plurality of layers of fibers can be applied to the mandrel, whereby a reinforcement of the wall of the tube thus formed can be carried out. Depending on the number of stacked

Layers can thus be formed more or less strong walls of tubular, angularly rigid body. Depending on the dimensions of the winding mandrel in terms of its axial and radial extent are rigid body with tubular structure with different axial dimensions, various cross-sections, wall thicknesses and profiles produced.

A further advantageous embodiment can provide that the fiber is an endless thread. A use of a fiber in the form of an endless thread has the advantage that a continuous transporting the Fa ^¬ ser can be carried out while continuously can take place in the mandrel, heating a continuous wetting and a continuous Aufbrin ^¬ gene of the endless fiber. By continuous treatment of a fiber it is thus understood that different sections of the fiber are simultaneously subjected to different successive process steps. The fiber is moved along its longitudinal extent. A winding of the fiber on the winding mandrel in different layers can thus lead to a rigid body, which has a large number of turns of the fiber, which are applied closely to each other lying on the winding mandrel. Thus, the required volume of liquid to be cured can be limited and the fiber acts in the manner of a reinforcing stabilizing in the final cured body. Depending on the manner of winding the fiber on the winding mandrel, various mechanical properties of the rigid body can be caused. Thus, for example, it is possible to make cross-windings of the fiber or to apply the fiber tightly wound helically on the mandrel. The wound fiber represents a web. Under an endless thread to the use of a fiber, it is meant herein that is continuously brought into a certain form of the future angularly rigid body in which one and the same thread itself is arranged to cross over within the angle rigid body, and thus a web bil ^¬ det. In this case, the thread may have a finite length, where ^¬ by but in the sense of this document, an endless thread is justified. In addition, more endless Fä ^¬ can be utilized together to form an angle rigid body overall. Thus, it is possible, for example, the fiber ge ^¬ rewinds provide and unwind said coil to heat the fiber continuously to wet and bring it into the final shape of the angle-rigid body. Furthermore, it can be advantageously provided that the fiber is a glass fiber. Advantageously, it can further be provided that the fiber is a polyamide fiber.

Glass fibers or polyamide fibers have a high resistance to mechanical loads. On the basis of glass fibers or polyamide fibers manufactured bodies are still mechanically strong.

A further advantageous embodiment can provide that the fiber is an aramid fiber.

Aramids are long-chain synthetic polyamides that are an organic plastic. These aramids are characterized by high strength, ductility and resistance to chemicals and temperatures. Aramid fibers can be produced and purchased in large quantities. Depending on requirements, various configurations of the fiber, ie, as continuous filament, as a trade, as short fibers, as webs of short fibers, as tissue mats o. Ä. Used become. Aramids contain salts that can absorb moisture (H ₂ 0). In particular, after long storage of an aramid fiber, the thermal desizing can be used to dissolve the moisture and dry the aramid fiber. Thus, inclusions of H ₂ O in the fiber in the rigid-angle body after curing are unlikely. Especially with a continuous thermal desizing, subsequent impregnation or wetting of the fiber and subsequent winding, a re-storage of H ₂ O is avoided in the fiber.

If necessary, a mix of different fibers such as glass fibers, polyester fibers or aramid fibers can be used. A further advantageous embodiment can provide that the liquid is an electrically insulating liquid into ^¬ special one standing before a final curing epoxy resin. Epoxy resins, which have an electrically insulating effect after curing, are particularly suitable as the electrically insulating liquid. Epoxy resins have a high mechanical stability and resistance to order ^¬ on gebungseinflüssen.

Another object of the invention is to provide a body which is angularly rigid and electrically insulating. According to the invention the object is achieved in an electrical Iso ^¬ lator, that the electrical insulator is a hollow insulator, which is prepared by wet winding according to one of the claims 1 to 16. Such electrical insulators can be used, for example, as a carrying element in composite insulators. But it can also be prepared tubular insulators, which are used for example in the kinematic chains and create an electrical Iso ^¬ lierstelle within the kinematic chain. Such kinematic chains can be used for example for the actuation of electrical switching devices, whereby a movement of a switching contact ^¬ piece is effected.

In the following, an embodiment of the invention is sche ^¬ matically shown in a drawing and described in more detail below. It shows the

Figure 1 shows a manufacturing method of a rigid-angle body using a heating channel, the

Figure 2 shows a manufacturing method of a rigid body using bent heating elements, the

FIG. 3 shows a production method of a rigid-angle body using a rotating heating element, and FIGS

FIG. 4 shows a rigid-angle body according to the invention, which has an electrically insulating effect.

In the following, an implementation of the method according to the invention is described by way of example with reference to FIGS. In this case, in the figures 1 to 3 in each case in principle equal ^¬ acting devices for performing the method steps are shown, wherein for the thermal desizing ever ^¬ different constructions are used. By way of example, the overall profile will first be described with reference to FIG. zess a production of a rigid body to be described.

FIG. 1 shows an arrangement of various devices for a continuous implementation of a production method for a rigid-angle body. The use of a first, a second and a third fiber 1, 2, 3 is provided. The fibers 1, 2, 3 are in each case in the form of so-called coils, that is, the fibers are each elongated and wound up, the cross-section of the fibers being substantially smaller than their length. The fibers 1, 2, 3 are each reversibly deformable and each provided with a size. An endless fiber 1, 2, 3 is here understood to mean a fiber 1, 2, 3 which has such a length that a continuous winding of a web on a winding mandrel 4 can take place, the same fiber 1, 2, 3 itself crossed several times and covered. The three fibers 1, 2, 3 are ^{ausgestal ¬} tet such that upon consumption of a coil of the fibers 1, 2, 3 each have a further coil is used, wherein the end of the outgoing fiber with the beginning of the fiber 1, 2nd , 3 of the newly added coil is linked and so a further continuous production of a rigid body is he ^¬ allows.

In the present case, the fibers 1, 2, 3 are each designed as aramid fibers, wherein a fiber 1, 2, 3 can certainly also be understood as a strand of a plurality of individual fibers, so that a more stable fiber 1, 2, 3 for winding a winch-rigid Body is available. Alternatively, however, the fibers 1, 2, 3 may also be formed as single strands. Each of the fibers 1, 2, 3 is first subjected to desizing. For desizing a heater 5 is provided. In the exemplary embodiment according to FIG. 1, the heating device 5 is designed as a heating channel 6, through which the fibers 1, 2, 3 are passed. In the present case, the heating channel 6 is designed such that in the heating channel 6, a heated fluid flows, which flows through the heating channel 6 through ^¬ . In the present case, it is provided that the fluid is a gas which flows through the heating channel 6. The gas is accelerated by blower 6a. However, it can also be provided that a heated liquid is introduced into the heating channel.

Within the heating channel 6, the fibers 1, 2, 3 are guided, wherein to increase the residence time, the fibers 1, 2, 3 are deflected several times within the heating channel 6 in its direction of movement and so even with a continuous passage of the first, second and third fibers 1, 2, 3 by the heating device 5 a sufficiently long flow around the heated fluid takes place, so that the sizing of the fibers 1, 2, 3 is released. In addition to an upright arrangement of the heating channel 6, as shown in the figure 1, alternative embodiments or configurations of the heating channel can be used.

After the sizing has been removed by thermal effects in the heating device 5 and the fibers 1, 2, 3 were heated by the heated fluid, the fibers 1, 2, 3 are fed directly to an impregnating device 7. The impregnation device 7 has a liquid through which the fibers 1, 2, 3 are passed. In the present case, it is provided that the watering device 7 has a trough-like shape, wherein in the trough a not yet hardened ^¬ tetes electrically insulating epoxy resin is located. By a hold-down 8, the fibers 1, 2, 3 are immersed in the liquid and soaked or wetted with the liquid. After impregnation of the fibers 1, 2, 3, the fibers are fed to the mandrel 4 via a distributor 9. The winding mandrel 4 is for example a body with egg ^¬ ner circular cylindrical structure, wherein the fibers 1, 2, 3 are placed on the outer surface of the winding mandrel. The spindle 4 rotates about its main axis 10. The fibers

1, 2, 3 are attached to the mandrel 4 and due to the rotation of the winding mandrel 4 is a continuous dragging of the fibers 1, 2, 3. The fibers 1, 2, 3 are starting from the respective coils of the fibers 1, 2, 3rd Immediately following introduced into the impregnating device 8 via the heating device 5 and fed to the winding mandrel 4 via the distributor 9. The rotational speed of Wi ^¬ ckeldorns 4 determines the time period of staying of the fibers 1, 2, 3 in the heater 5, and in the impregnating device. 7

In order to arrange the fibers 1, 2, 3 in the desired manner on the mandrel 4, the distributor 9 is equipped with a movable distributor 11. The distributor 11 moves this case substantially parallel to the main axis of the winding mandrel 10 transversely to the towing direction of the fibers 1, 2, 3. On the way of movement or the speed of the distributor 11 takes a certain storage and Anord ^¬ drying the impregnated fibers 1, 2, 3 on the winding mandrel 4. Thus, on the lateral surface of the winding mandrel 4 a Ge ^¬ spinst different layers of mutually overlapping fibers 1,

2, 3. Thus, a web of fibers 1, 2, 3 is formed, which adhere to one another due to the impregnation with the not yet cured epoxy resin. Depending on the control of the movement of the Distributor 11 is formed on the lateral surface of the winding mandrel 4, a more or less strong wall of a trainees rigid body. Preferably, the aim should be that over the entire length of the winding mandrel 4 as possible, a uniform wall thickness of fibers 1, 2, 3 and epoxy resin is formed.

After reaching the desired arrangement of the fibers 1, 2, 3 on the winding mandrel 4, the fibers 1, 2, 3 separated from the coils and the winding mandrel 4 are removed. On the removed mandrel 4 hardens the insulating resin. Another mandrel can now be clamped in the device, which ensures a rotation of the winding mandrel 4 and another angularly rigid body can be formed. In this case, the shape of the mandrel may vary, so that variously shaped rigid body can be Herge ^¬ provides.

For example, winding mandrels of different diameters of different cross-sections and different profilings along the axis of rotation can be used. Thus, for example, conical mandrels, concave or convex mandrels, etc., can be used to produce corresponding rolls of impregnated fibers 1, 2, 3.

Impregnation of the fibers 1, 2, 3 should in this case such SUC ^¬ gen that a sufficient volume of liquid epoxy resin to the fibers 1, 2, 3 remains adhered, wherein after winding onto the winding mandrel 4, the fibers 1, 2, 3 within embedded in the epoxy resin and in particular the Mantelflä ^¬ chen is formed on the outer periphery after completing the winding on the winding mandrel 4 of a continuous layer of epoxy resin, so that the fibers 1, 2, 3 are encapsulated within the epoxy resin. As a result, the fibers are present Protected against mechanical stress and after curing, a rigid-angle tubular body is given, which has an epoxy resin surface with embedded fibers 1, 2, 3 on ^¬ .

FIG. 2 essentially shows the structure as it is known from FIG. Only the configuration of the heating device 5 varies. Therefore, it is only entered into the construction of the heater 5 of Figure 2 in the following gene. In the present case, the heating device 5 is equipped with two Heizele ^¬ elements 12, 13. The heating elements 12, 13 are each ^¬ weils similarly constructed and have convexly curved heating ^¬ plates 12a, 13a. The fibers 1, 2, 3 are guided over the arched heating plates 12a, 13a, so that the fibers 1, 2, 3 rest on the heating elements 12, 13 and thereby have a curved arrangement. As is known from FIG. 1, the arcuately shaped fibers 1, 2, 3 are driven by a rotation of the winding mandrel 4 over the heating plates 12a, 13a, wherein a direct contact of the fibers 1, 2, 3 with the heating plates 12a , 13a takes place. When contacting the fibers 1, 2, 3 with the heating plates 12a, 13a of the heating elements 12, 13, the sizing and the fibers are heated to approximately 300 ° C. Under the thermal action, the sizing of the fibers 1, 2, 3 solved. Due to the spatial extent of the heating plates 12a, 13a, the fibers are not heated exclusively via the contact points by contact heat, but also by the heating elements 12, 13 in the surroundings of generated heat radiation. Starting from the heating elements 12, 13 is formed adjacent to the fibers 1, 2, 3, a fluid flow, for example, by

Convection driven the fibers 1, 2, 3 flows around and flows around.

The fibers 1, 2, 3 are placed on the heating elements 12, 13 and are towed over the heating elements 12, 13. 3 shows a further variant of an embodiment of a heater 5. The heater 5 of Figure 3 is configured as a rotating heating drum 14, wherein the Fa fibers 1, 2, resting on the designed as a heating surface Mantelflä ^¬ surface of the rotating heating drum 14. 3 The rotational speed of the rotating ^¬ heating drum 14 is synchronized to the speed of movement of the fibers 1, 2; 3. The laid fibers 1, 2, 3 remain relative to the surface shell of the rotating heating drum 14 at rest, so that interim ^¬ rule the heating drum 14 and the fibers 1, 2, 3 no additional drag friction. Depending on requirements, the fibers 1, 2, 3 can be wrapped around the axis of rotation of the heating drum 14 one or more times, so that the fibers 1, 2, 3 can stay longer or shorter on the heating device 5. It can also be provided that the fibers 1, 2, 3 rest only in one point on the rotating heating drum 14 or rest only in a small sector of the lateral surface of the rotating heating drum 14, whereby a correspondingly shortened action of the thermal ^¬ energy, which goes from the rotating heating drum 14 ^¬ takes place.

FIG. 4 shows, by way of example, an angle-resistant body 15, which has a stored web of fiber 1, 2, 3 in a cured epoxy resin. In an end ^¬ surface 16, the annular structure of the cross section of the angle-rigid body 15 is visible, is being indicated by a plurality of arcs, a plurality of layers of fibers 1, 2; 3. The rigid body has over its axial length to an approximately constant wall thickness and is designed as Hohlkreiszy ^¬ linder. In the lateral surface, a crosswise overlapping of the fibers 1, 2, 3 is symbolically indicated, wherein the fibers 1, 2, 3 on the outer surface of the angular rigid body 15 are covered by cured epoxy resin.

Notwithstanding the hollow circular cylinder-like shape of the body 15 win- kelstarren variously profiled tubular angularly rigid body can be ausges ^¬ taltet by the choice verschiedenarti ^¬ ger mandrels and different wall thicknesses. The production of an angularly ^¬ rigid body shown in Figures 1, 2, 3 uses each endless elongated fibers, which are wound on a winding mandrel. 4 However, it can also be provided that, in order to produce a web on the mandrel 4, a large number of short, thermally desized fibers, which are subsequently impregnated in a liquid, are applied to the winding mandrel 4 in the impregnated state. By unstructured alignment of the short fibers 1, 2, 3 on the winding mandrel 4 thus creates a web of short fibers, which adhere to each other due to the impregnation and one above the other and also strengthen a rigid body after curing of the liquid. A further embodiment of the fiber can be provided for example in such a way that the fiber is in the manner of a fabric or a knitted fabric of individual fibers, wherein the fabric / knit fabric is present either before desizing the fiber and impregnating the fiber or only after one Desizing is produced.

In addition, a method according to the invention can also be used in that the desized and subsequently impregnated fiber is introduced into a negative mold and cured in ^¬ within the negative mold to form an arbitrarily shaped rigid-angle molded body.

Claims

claims

1. A manufacturing method of a rigid body (14) using an elongated, provided with a sizing fiber (1, 2, 3), which is embedded in a liquid to be cured ^¬ ,

d a d u r c h e c e n c i n e s that

-the size of the fiber (1, 2, 3) are dissolved by thermal Einwir ^¬ effect and the fiber (1, 2, 3) is heated that -the heated fiber (1, 2, 3) is wetted with the liquid and that

- The liquid with an embedded web of fiber (1, 2, 3) hardens rigid angle. 2. Production method according to claim 1,

d a d u r c h e c e n c i n e s that

the sizing is exposed to a temperature of about 250 ° C to 400 ° C, in ^¬ particular 300 ° C. 3. Production method according to claim 1 or 2,

d a d u r c h e c e n c i n e s that

the fiber (1,

2,

3) to solve the sizing of a heated fluid is washed.

4. Production method according to claim 3,

d a d u r c h e c e n c i n e s that

the heated fluid is a gas.

5. The manufacturing method according to claim 2, wherein:

the fluid has a temperature of about 250 ° C to 400 ° C, ^{insbesond ¬} re 300 ° C.

6. The manufacturing method according to claim 2, wherein:

the fiber (1, 2, 3) is passed through a heating channel (6).

7. The manufacturing method according to claim 1, wherein:

the fiber (1, 2, 3) of a heating element (12, 13, 14) positioned ^¬ is inserted.

8. Production method according to claim 7,

d a d u r c h e c e n c i n e s that

the fiber (1, 2, 3) arcuately on the heating element (12, 13,

14) is launched.

9. Production method according to claim 7 or 8,

d a d u r c h e c e n c i n e s that

the fiber (1, 2, 3) is towed over the heating element (12, 13).

10. A manufacturing method according to claim 7 or 8,

d a d u r c h e c e n c i n e s that

a heating element (14) synchronized with a movement of the Fa ^¬ ser (1, 2, 3) is moved parallel thereto.

11. The manufacturing method according to claim 1, wherein:

the desized and impregnated with the liquid fiber (1, 2, 3) is applied to a winding mandrel (4) and cures tubular.

12. Production method according to claim 1 to 11,

d a d u r c h e c e n c i n e s that

the fiber (1, 2, 3) is an endless thread.

13. The manufacturing method according to claim 1, wherein:

the fiber (1, 2, 3) is a glass fiber.

14. The manufacturing method according to claim 1, wherein:

the fiber (1, 2, 3) is a polyester fiber.

15. Manufacturing method according to claim 1 to 12,

d a d u r c h e c e n c i n e s that

the fiber (1, 2, 3) is an aramid fiber.

16. A manufacturing method according to any one of claims 1 to 15, wherein a

the liquid is an electrically insulating liquid, in particular a standing before a final curing Epo xidharz.

17. Electrical insulator

d a d u r c h e c e n c i n e s that

the electrical insulator is a hollow insulator, which is by wet winding according to one of the claims 1 to 16 Herge ^¬ is.