DE102011005323A1 - Process for the preparation of a tension-coated with a polymer layer tension carrier - Google Patents

Abstract

The present invention relates to a process, in particular a continuous process for the production of a polymer layer encased tensile carrier, which comprises the following steps: a) producing at least one tensile carrier by impregnating at least one carbon fiber-containing fiber structure with at least one polymer precursor and pultruding the impregnated fiber structure; at least partially sheathing the at least one tensile carrier produced in step a) with a layer of a polymer by means of extrusion. In addition, the present invention relates to a sheathed tensile carrier obtainable by the process according to the invention, its use and a device for producing, in particular continuous production of a sheathed tensile carrier.

Description

The present invention relates to a process, in particular a continuous process for the production of a coated with a polymer layer tension carrier, in which a fiber structure impregnated with at least one polymer precursor and the tensile support thus produced is then coated with a polymer layer. Furthermore, the present invention relates to a sheathed tensile carrier obtainable by the process according to the invention, its use and an apparatus for the continuous production of a sheathed tensile carrier.

Supporting means, such as conveyor belts, are coated with a layer, in particular a polymer layer. While the sheath protects the conveyor belt from mechanical damage, the tension member, which is usually designed as a composite material, serves to transmit the tensile forces arising in the conveyor belt and gives the conveyor belt the necessary carrying capacity and shock resistance.

From the WO 2009/026730 A1 For example, a suspension means for an elevator system is known, which comprises a plurality of each provided with a coating of a thermoplastic fiber-shaped tension members made of metal, wherein a plurality of these coated tension elements is coated with an outer sheath of a polymer material.

In the WO 2009/090299 A1 a suspension element for an elevator system is proposed, which is designed as a jacket coated by a polymer layer tension carrier. In this case, the tensile carrier is a fiber composite material which is formed from fibers impregnated with a polymer matrix. Such coated with a polymer layer tensile carriers have for use in a load application, such as a passenger elevator system, advantageous properties, namely in particular a high tensile strength and high wear resistance on.

However, the previously known methods for the production of such coated with a polymer layer tension members are very expensive and expensive. For the production of conventional suspension systems for elevator systems, it is known, for example, to strand steel strands and to wind the stranded steel strands over a mandrel and then to encase them. This process is only possible intermittently and also only partially automated. Furthermore, due to the mandrel radius, this method leads to pre-curved support means due to the mandrel radius, the length of the suspension element produced in this way being limited due to the pre-curvature. A suspension with ever higher heights, as they are increasingly required in the market for elevator systems, can not be produced by such a method.

Object of the present invention is therefore to provide a method for producing a coated with a polymer layer tension carrier, which is feasible in a continuous process with little time and cost, can be produced with the sheathed tensile carrier with an unlimited length and without pre-curvature, and with which sheathed tensile carriers are obtained which have the properties required for use as suspension elements in a truck-mounted system, namely in particular a high tensile strength and an excellent wear resistance.

• a) Herstellen wenigstens eines Zugträgers durch Imprägnieren wenigstens einer Carbonfasern enthaltenden Faserstruktur mit wenigstens einem Polymervorläufer sowie Pultrudieren der imprägnierten Faserstruktur und
• b) zumindest bereichsweises Ummanteln des wenigstens einen in dem Schritt a) hergestellten Zugträgers mit einer Schicht aus einem Polymer mittels Extrusion.

According to the invention, this object is achieved by a process for the production of a tension carrier encased in a polymer layer, which comprises the following steps:

• a) producing at least one tensile carrier by impregnating at least one carbon fiber-containing fiber structure with at least one polymer precursor and Pultrudieren the impregnated fiber structure and
• b) at least partially sheathing the at least one tensile carrier produced in step a) with a layer of a polymer by means of extrusion.

The method according to the invention makes it possible to produce a tension carrier encased in a polymer layer in a process which is continuously carried out from the provision of the fiber structure to the receipt of the finished coated tension carrier without interruption. Another advantage of the method is that it is easy to automate. Thus, the present invention makes it possible, with little expenditure of time and expense, to produce a tension member encased in a polymer layer which, due to its mechanical properties, is excellently suited for use as a suspension element in a load application, for example in a passenger elevator system. Due to the fiber structure contained in the sheathed tensile structure, which is processed by impregnation with a polymer to a tensile carrier and comprises carbon fibers, the sheathed tensile carrier produced according to the invention can absorb excellent tensile forces acting in the longitudinal direction of the carbon fibers, which is why the tensile carrier in particular has a very high tensile strength. In addition, the fibers of the fiber structure by the impregnation of the fiber structure with polymer in the further processing and in the subsequent application reliably from damage, such as before the formation of cracks on the peripheral surface of the Fibers or from buckling of the fibers, protected. In addition, the tensile member as a whole is protected from mechanical deterioration by the extrusion-polymer jacket, and the properties of the outer polymer coating can be combined with those of the tension member.

Further, by the sheath, the elastic properties of the produced sheathed tensile carrier can be adjusted to a desired value. Due to the achieved by the extrusion particularly solid cohesive connection between the sheath and the tension member is finally an effective transfer of forces that are exerted on the jacket, for example, by a drive or pulley of an elevator system, allows the internal tension member.

In particular, with the method according to the invention a jacketed tensile carrier with almost unlimited length and without pre-curvature can be produced, because the fibers of the fiber structure are oriented substantially straight in the entire process with respect to their longitudinal extent. Because of this, the method according to the invention is particularly suitable for the production of jacketed tension members, which are used for a double bend. In addition, the method according to the invention can easily be upscaled or scaled up, so that with relatively low investment costs and with comparatively low production costs, it is possible to achieve annual production quantities of coated tension members of more than 5,000 km.

For the purposes of the present invention, a fiber structure is understood to be any structure which comprises a plurality, that is, at least two, fibers.

In addition, in the context of the present invention, the term "polymer precursor" is more generally referred to as any single- or multi-component composition from which a polymer, by which copolymers are understood, can be prepared by curing. For example, the polymer precursor can be a reactive monomer and / or oligomers and optionally catalyst-containing mixture which can be polymerized under suitable temperature conditions to form a polymer. On the other hand, the polymer precursor may itself be an uncrosslinked or precrosslinked polymer which is crosslinked by curing or whose degree of crosslinking is increased by curing. By curing the polymer precursor is thus understood the reaction of the polymer precursor to the polymer, i. H. For example, the polymerization of monomers or oligomers to the polymer or the crosslinking of uncrosslinked or precrosslinked polymers to the fully crosslinked polymer.

Finally, for the purposes of the present patent application pultrusion is understood to mean exclusively a shaping step, that is to say a step without the previous impregnation.

The process according to the invention specifically comprises impregnating a fiber structure with a polymer precursor and subsequently curing the polymer precursor, because such a fiber structure is obtained, which is particularly completely and uniformly impregnated or penetrated by the polymer, since the not yet cured polymer precursor has a comparatively low viscosity and so can penetrate deeply and evenly during the impregnation in the cavities of the fiber structure. Due to this, the fibers contained in the tensile carrier are particularly effectively protected by the polymer against mechanical effects which arise, for example, as a result of rubbing together of different fibers.

In the light of the foregoing, the present invention provides a method which can be carried out continuously, in particular, from which a fiber structure can easily and cost-effectively be used to produce a tensile layer coated with a polymer layer, which is ideal for use as a suspension element in a truck-mounted system, in particular in an elevator system.

In order to fully exploit the effects of the present invention, it is proposed in a further development of the inventive idea to carry out the method according to the invention continuously. In this context, a continuous process is understood in particular to mean a process in which the two steps a) and b) are carried out successively such that the step speed of the first step corresponds at least substantially to the step speed of the second step.

According to an advantageous embodiment of the present invention, in the step a) as fiber structure containing carbon fibers, a roving, a scrim, a nonwoven, a felt, a knitted fabric, a knitted fabric, a braid, one or more yarns, one or more strands or a fabric used. In addition to carbon fibers, in principle other fibers may also be present in the fiber structure, for example fibers of glass, basalt and / or aramid.

However, particularly good results are obtained if in step a) of the process according to the invention as carbon fibers containing Fiber structure a roving, a leno cloth or a woven tape is used, wherein the use of a roving is very particularly preferred. It is of course advantageous if at least a part and preferably all of the fibers of the fiber structure are oriented in the direction of the longitudinal extent of the tension member, because a tensile carrier is thus created, which can absorb particularly high tensile forces in its longitudinal direction.

In a further development of the inventive concept, it is proposed to use a roving having a filament number of between 1,000 and 300,000, preferably between 12,000 and 60,000 and particularly preferably between 24,000 and 50,000, in step a) as the carbon fiber-containing fiber structure, because these are particularly advantageous with the method according to the invention can be processed well to coated tension members with the desired properties. A roving containing, for example, 24,000 or 50,000 filaments or fibers is also referred to as 24k roving or 50k roving.

Sheathed tensile carriers with particularly good mechanical properties and in particular particularly high tensile loads are achieved in particular with the process according to the invention if a roving is used in step a) as a carbon fiber-containing fiber structure whose fibers have a length weight between 1 and 10 g / m, preferably between 2 and 5 g / m, and more preferably between 3 and 4 g / m. With a fiber structure containing such fine fibers, a particularly good adhesion between the fibers and the impregnated polymer and thus a particularly strong bond in the tensile carrier is obtained.

For the same reason, it is preferred to use in the step a) as fiber structure containing carbon fibers, a roving whose fibers have a diameter between 5 and 10 microns and more preferably between 6 and 7 microns.

In order to produce a highly tensile and at the same time extremely wear-resistant and flexible sheathed tensile member, due to the high strength and other advantageous mechanical properties of carbon fibers in step a) preferably a carbon fiber-containing fiber structure is used, which at least 50%, particularly preferably at least 80% , more preferably at least 90% and most preferably entirely consists of carbon fibers. For fiber structures not entirely made of carbon fibers, the remaining fiber portion may be, for example, glass fibers, polymer fibers such as aramid fibers, basalt fibers or any mixtures of two or more of the above fiber types.

According to a further advantageous embodiment, a fiber structure is used in step a) which comprises at least two fiber layers and / or fiber regions, which may be spatially separated from each other or overlap, preferably with respect to the type of fibers contained therein or with respect differentiate the proportions of the fibers contained therein. For example, the layers may differ in the proportions of the carbon fibers contained in the layers and the other fibers such as glass fibers. In this way, the mechanical properties of the tensile carrier produced in the individual areas of the tension member can be adjusted specifically. For example, due to its very high content of carbon fibers, a layer arranged in the center of the tensile carrier with respect to a height direction of the tensile carrier can have a particularly high tensile strength, while a layer arranged thereon, which contains fewer carbon fibers, has an increased flexibility compared to this layer Having the longitudinal direction of the tension member.

Thus, in step a), for example, a fiber structure can be used which comprises at least one layer which consists of at least 50%, preferably at least 80%, particularly preferably at least 90% and most preferably entirely of carbon fibers, and at least one layer which is composed of another kind of fibers such as glass fibers, polymer fibers such as aramid fibers, basalt fibers other than the carbon fibers contained in the other layer, or any mixtures of two or more of the above fiber types.

In order to improve the adhesion of the impregnated polymer to the fibers in the tensile carrier, it is proposed in a further development of the inventive idea to use in step a) a fiber structure which at least partially contains fibers which are coated with a size. Good results in this respect are obtained, for example, if the size contains a polyurethane or an epoxy ester. Such sizing acts as a bonding agent between the fibers and the polymer precursor applied during the impregnation, so that a particularly complete and firmly adhering impregnation of the fibers with the polymer is achieved by the use of the sizing.

In the context of the present invention, fiber structures with all carbon fibers known to the person skilled in the art can be used in step a). For example, the carbon fibers by carbonation and optionally subsequent graphitization a carbon precursor, such as polyacrylonitrile or pitch.

Suitable polymer precursors for the process according to the invention are in particular reactive thermoplastic precursors and reactive thermoset precursors. As a reactive thermoplastic precursor herein is referred to a polymer precursor which is polymerizable by curing to a thermoplastic, whereas as a reactive thermoset precursor, a polymer precursor is called, which is crosslinkable by curing to a thermosetting plastic or polymerizable by curing to a thermoset and crosslinkable. The thermoplastic or Duroplastvorläufer is preferably cured by a heat treatment, wherein the thermoplastic or Duroplastvorläufer for this purpose, a catalyst can be added. A thermoplastic or Duroplastvorläufer has in comparison to the cured polymer to a comparatively low viscosity, so that it can penetrate particularly deep into the at least one fiber structure and impregnate this particularly completely and evenly.

• i) eine Mischung, welche wenigstens ein Monomer und ggf. wenigstens einen Katalysator umfasst,
• ii) eine Mischung, welche wenigstens ein Oligomer und ggf. wenigstens einen Katalysator umfasst, oder
• iii) eine Mischung, welche wenigstens ein Monomer, wenigstens ein Oligomer und ggf. wenigstens einen Katalysator umfasst.

Basic examples of polymer precursors in the form of reactive thermoplastic precursors which can be cured to give thermoplastics are:

• i) a mixture comprising at least one monomer and optionally at least one catalyst,
• ii) a mixture comprising at least one oligomer and optionally at least one catalyst, or
• iii) a mixture comprising at least one monomer, at least one oligomer and optionally at least one catalyst.

An oligomer is a molecule which contains between 2 and less than 100 structurally identical repeat units. By contrast, the term "polymer" denotes a molecule which contains at least 100 structurally identical repeat units.

By suitable choice of the catalyst used, the temperature at which the thermoplastic precursor is polymerized, can be adjusted specifically, so that the curing of the thermoplastic precursor to the thermoplastic can be carried out in a particularly controlled.

Concrete examples of thermoplastic precursors to be used in step a) are polyamide precursors, that is to say compositions which polymerize on curing to give a polyamide. For this purpose, for example, a caprolactam and optionally a catalyst-containing mixture can be used.

According to a further preferred embodiment of the present invention, at least one reactive thermoset precursor is used in step a). This may for example be selected from the group consisting of phenolic resins, polyurethane resins, epoxy resins, polyester resins and vinyl ester resins.

In this embodiment, mixtures of corresponding monomers, optionally oligomers and, if appropriate, catalyst can be used as thermoset precursors which polymerize and crosslink during curing or already polymers which are uncrosslinked or only weakly precrosslinked, which are then crosslinked or completely cured be networked.

Phenoplasts are thermosetting plastics based on phenolic resin produced by polycondensation, for which reason phenol precursors are, for example, mixtures of a phenol, an aldehyde and an acid or base as catalyst. On the other hand, thermosetting polyurethanes are crosslinked polymers containing urethane groups, which can be advantageously synthesized by a polyaddition reaction from polyols and polyisocyanates, the polyol and / or the polyisocyanate being trifunctional or higher functional. A corresponding thermoset precursor thus contains, for example, a polyol, a trifunctional polyisocyanate and a catalyst, such as an amine or an organometallic compound. Epoxy resins can be prepared, for example, by catalytic polymerization of epoxides or by reacting epoxides with diols such that a corresponding epoxy resin precursor contains, for example, an epoxide such as epichlorohydrin, a diol such as bisphenol A, and a catalyst. On the other hand, thermosetting polyesters are crosslinked polymers containing ester groups, so that, for example, a mixture of an alcohol, a carboxylic acid and a catalyst is used as precursor for thermosetting polyesters, where the alcohol and / or the carboxylic acid is trifunctional or higher functional. Finally, vinyl esters are prepared, for example, by the esterification of epoxy resins with acrylic acid or methacrylic acid.

In principle, the process according to the invention can be carried out in such a way that the polymer precursor completely cures during the impregnation and subsequent pultrusion in step a). However, at least for some polymer precursor systems, it has proven to be simpler in terms of process technology to preharden the polymer precursor in step a) during the impregnation and subsequent pultrusion and to completely cure it only after pultrusion. Curing means the complete in the case of a thermoplastic precursor polymerization of the thermoplastic precursor and in the case of a thermoset precursor the complete crosslinking or complete polymerization and crosslinking of the thermoset precursor, whereas precuring means only partial, but not yet complete, polymerization of a thermoplastic precursor or the partial, but not yet complete crosslinking or polymerization and crosslinking of a thermoset precursor.

For curing or precuring during the impregnation and subsequent pultrusion taking place in step a), the polymer precursor applied to the fibrous structure can be heated, for example by means of a heating device contained in the pultrusion tool, for example to a temperature of at least 50 ° C and preferably of at least 80 ° C.

According to a further advantageous embodiment of the present invention, the polymer precursor is injected into a pultrusion tool during the impregnation in step a). This allows a particularly targeted and material-saving impregnation of the fiber structure with polymer precursor. Preferably, the polymer precursor is injected in this embodiment with a pressure between 1 and 50 bar in the pultrusion tool.

Preferably, the pultrusion tool comprises a forming tool. In this case, the shaping tool can be or comprise a shaping nozzle, through which the fiber structure is pulled, so that the cross section of the fiber structure is brought at least approximately to a predetermined by the shaping nozzle cross-section. In this case, it is preferred that the polymer precursor be injected in step a) into the forming tool, preferably into the forming die of the forming tool. Furthermore, in this case it is preferable to inject the polymer precursor used for the impregnation into the pultrusion tool by means of a metering system.

According to the invention, the tensile carrier produced as described above in step a) is encased at least in regions with a polymer, specifically by means of extrusion. In principle, any polymer can be used in step b) as long as it is extrudable. However, good results are obtained in particular if the tensile carrier produced in step a) is sheathed in step b) at least in regions with a thermoplastic, thermosets or elastomer, and particularly preferably with a thermoplastic elastomer.

According to an advantageous embodiment of the present invention, in step b) a polymer is used which is selected from the group consisting of thermoplastic polyolefins, thermoplastic polyurethanes, thermoplastic starches, thermoplastic rubbers, elastomeric rubbers, phenolic resins, polyurethane resins, epoxy resins, polyester resins, vinyl ester resins and any mixtures of two or more of the aforementioned compounds.

In order to obtain a sheathed tensile carrier with excellent elasticity and in particular flexibility, as required, for example, for a suspension in an elevator system, it is proposed in a further development of the inventive idea to use in step b) a polymer which at room temperature and in the cured Condition has a modulus of elasticity of at most 1,000 MPa.

In principle, the extrusion in step b) can be carried out at any suitable temperature, wherein the polymer during the extrusion, for example, to a temperature between 100 ° C and 400 ° C, preferably between 150 ° C and 300 ° C and particularly preferably between 180 ° C and 250 ° C is heated. As a result, a readily flowable extrudate with good adhesive properties can be produced with the conventional thermoplastics and thermoplastic elastomers, which leads to a uniform sheathing of the tensile carrier and to a very strong cohesive connection between the sheathing and the tensile carrier produced in step a).

In order to apply the polymer material in a particularly controlled manner to the tensile carrier during the extrusion and in particular to allow precise control over the thickness of the applied polymer layer, the polymer is extruded in step b) onto the impregnated tensile carrier preferably substantially perpendicular to the longitudinal direction of the tensile carrier. To extrude the polymer, an extrusion die can be used, the outlet opening of which is directed essentially perpendicular to the longitudinal direction of the impregnated tensile carrier onto the impregnated tensile carrier.

For impregnation it is generally possible to use a substantially annular extrusion die through which the impregnated tensile support produced in step a) passes. As a result, a full enclosure of the tension member can be achieved with high uniformity in a simple manner. This can be achieved in a particularly suitable manner in that the polymer is extruded in step b) by a crosshead onto the impregnated tensile carrier.

The process is preferably carried out such that the sheathed tensile carrier obtained in step b) is perpendicular to its longitudinal extent measured elastic modulus of 0.1 to 4 GPa.

Another object of the present invention is a coated with a polymer layer tensile carrier, which is obtainable by the inventive method described above. The advantageous embodiments and advantages described above in relation to the method apply correspondingly to the sheathed tensile carrier according to the invention.

Such a tension member may in particular be designed as a suspension element and is particularly suitable for use as a suspension element in a load application, preferably in a conveyor system, in a transport system, in a traction system, in a machine for traction or power transmission or in an elevator system and particularly preferably in a passenger elevator system.

Another object of the present invention is an apparatus for producing, in particular for the continuous production of a coated with a polymer layer tension carrier, which comprises a pultrusion device and downstream thereof an extrusion device, wherein in the pultrusion means a heating device is provided. By means of such a pultrusion device, according to the method of the invention, at least one fiber structure containing carbon fibers can be impregnated with at least one polymer precursor and the polymer precursor can be precured or cured in the pultrusion device. As a result, a polymer precursor with sufficiently low viscosity can be introduced into the fiber structure, so that the fiber structure is impregnated particularly completely and uniformly and then precured or cured in the pultrusion device.

The device according to the invention can comprise a pultrusion device with a shaping tool as described above and / or an extrusion device with an extrusion nozzle as described above.

The invention will now be described purely by way of example with reference to an advantageous embodiment with reference to the accompanying figure.

In the figure, a production line for carrying out the continuous process according to the invention for producing a coated with a polymer layer tension carrier according to an embodiment of the present invention is shown.

Viewed in the conveying direction, the production line includes 8th first a feed section 10 in which the production line 8th fiber structures containing several carbon fibers 12 are supplied, which are formed in the present embodiment as carbon fibers containing rovings whose fibers are oriented along the conveying direction.

On the feeder section 10 follows a pultrusion section 14 with a pultrusion tool 16 in which the individual fiber structures 12 merged and through to form an impregnated fiber structure 18 impregnated with at least one polymer precursor and precured.

In this case, the pultrusion tool comprises 16 a pultrusion die (not shown) through which the at least one polymer precursor is pressurized into the pultrusion die 16 is injected to the fiber structures 12 to impregnate. In this case, the pultrusion nozzle is heated in the present embodiment to heat the polymer precursor, so that this on the fiber structures 12 is pre-cured.

The impregnated and pre-cured fiber structure shown in the figure in perspective view 18 has an approximately rectangular cross-section which is determined by the shape of the pultrusion nozzle of the pultrusion tool 16 is determined. In the present embodiment, the impregnated and pre-cured fiber structure 18 a greater width b than height h.

As stated above, the fiber structures 12 in the embodiment shown in the figure when pulling into the pultrusion tool 16 merged. However, within the scope of the present invention, it is also possible for this purpose before the pultrusion tool 16 provide a separate merging unit to the individual fiber structures 12 merge. Such a merging unit may, for example, comprise a plurality of deflection rollers or deflection rollers, between which a gap is formed, through which the fiber structures 12 be passed through to merge these.

After the pultrusion section 14 becomes the impregnated and pre-cured fiber structure 18 continuously a curing section 20 in which a heating unit is used to fully cure the at least one polymer precursor to the polymer 22 is provided. The complete curing of the polymer precursor becomes the tensile carrier 24 educated. The heating unit 22 For example, it may have one or more heated plates over which the impregnated one fiber structure 18 to be led. Alternatively, or in addition to this, the heating unit 22 for this purpose also comprise a convective heating unit or a radiant heater.

In the context of the present invention, it can be applied to the fiber structures 12 applied polymer precursors in principle already in the pultrusion section 14 completely cured, in which case to one of the pultrusion tool 16 separate heating unit 22 can be waived. Alternatively, in principle, a pre-hardening or curing in the pultrusion tool 16 be waived and complete curing in the downstream of the pultrusion tool 16 arranged heating unit 22 respectively.

On the curing section 20 follows an extrusion section 26 in which an extrusion tool 28 is provided to the tension member 24 by extrusion to form a jacketed tension member 32 with a layer 30 to coat from a polymer. In this case, the extrusion tool includes 28 one perpendicular to the tension member 24 directed transverse spray head, through which the tension member 24 passes through. As can be seen in the figure, the tension member 24 in the extrusion tool 28 completely encased with the polymer, the polymer layer 30 has a substantially constant thickness over the entire surface of the tension member.

Seen in the conveying direction behind the extrusion section 26 follows a drawing section 34 with a drawing unit 36 , which the sheathed Zugträger 32 through the upstream stages of the production line arranged in the conveying direction 8th draws. In the present embodiment, the drawing unit is 36 formed by two bands, which from the top and bottom of the sheathed tensile carrier 32 attack.

Finally, the draw unit follows downstream 36 a winding section 38 with a take-up unit formed by a roll 40 for winding up the finished coated tension member 32 ,

According to the present invention, the entire process, that is from the feed section 10 to the winding section 38 , carried out continuously. The sheathed tensile beam produced by this method 32 is designed as a belt-like support means with a greater width B than height H, which is ideal for use in a load application, such as in conveyors, in transport systems, in trains, in machines for traction or power transmission and in particular in passenger lift systems.

LIST OF REFERENCE NUMBERS

8th

production line

10

feeding section

12

fiber structure

14

Pultrusionsabschnitt

16

Pultrusion / pultrusion

18

impregnated fiber structure

20

curing section

22

heating unit

24

tension members

26

extruded section

28

Extrusion die / extrusion device

30

polymer layer

32

jacketed tension member

34

drawing section

36

drawing unit

38

winding-up

40

rewinder

b, B

width

h, H

height

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2009/026730 A1 [0003]
• WO 2009/090299 A1 [0004]

Claims (16)

Process for the preparation of a polymer layer ( 30 ) sheathed tensile carrier ( 32 ), comprising the following steps: a) producing at least one tensile carrier ( 24 ) by impregnating at least one carbon fiber-containing fiber structure ( 12 ) with at least one polymer precursor and pultrusion of the impregnated fiber structure and b) at least partially sheathing the at least one tensile carrier produced in step a) ( 24 ) with a layer ( 30 ) of a polymer by extrusion. A method according to claim 1, characterized in that it is carried out continuously. A method according to claim 1 or 2, characterized in that in step a) as a carbon fiber-containing fiber structure ( 12 ) a roving with a filament number between 1,000 and 300,000, preferably between 12,000 and 60,000, and more preferably between 24,000 and 50,000 is used. Method according to at least one of the claims, characterized in that in the step a) fiber structure containing carbon fibers ( 12 ) a roving is used whose fibers have a length weight between 1 and 10 g / m, preferably between 2 and 5 g / m and more preferably between 3 and 4 g / m. Method according to at least one of the preceding claims, characterized in that, in step a), a fiber structure containing carbon fibers ( 12 ) a roving is used whose fibers have a diameter between 5 and 10 microns and preferably between 6 and 7 microns. Method according to at least one of the preceding claims, characterized in that in step a) a fiber structure containing carbon fibers ( 12 ) which is at least 50%, preferably at least 80%, more preferably at least 90%, and most preferably entirely consists of carbon fibers. Method according to at least one of the preceding claims, characterized in that the fiber structure used in step a) ( 12 ) comprises at least two fiber layers and / or fiber regions, which preferably differ with respect to the type of fibers contained therein. Method according to claim 7, characterized in that in step a) a fiber structure ( 12 ) which comprises at least one layer which consists of at least 50%, preferably at least 80%, particularly preferably at least 90% and most preferably entirely of carbon fibers, and comprises at least one layer which consists of a different type of fibers, preferably glass fibers, polymer fibers, such as aramid fibers, or basalt fibers is composed. Method according to at least one of the preceding claims, characterized in that in step a) at least one polymer precursor is used which is at least one reactive thermoplastic precursor and / or at least one reactive thermoset precursor. A method according to claim 9, characterized in that in step a) at least one reactive Duroplastvorläufer is used, which is preferably selected from the group consisting of phenolic resins, polyurethane resins, epoxy resins, polyester resins and vinyl ester resins. Method according to at least one of the preceding claims, characterized in that the tensile carrier produced in step a) is sheathed in step b) at least in regions with a thermoplastic, thermosets or elastomer and preferably with a thermoplastic elastomer. Method according to at least one of the preceding claims, characterized in that the polymer in the step b) during the extrusion to a temperature between 100 ° C and 400 ° C, preferably between 150 ° C and 300 ° C and particularly preferably between 180 ° C. and 250 ° C is heated. Method according to at least one of the preceding claims, characterized in that in the step b) the polymer by a cross-spray head on the impregnated tensile carrier ( 24 ) is extruded. With a polymer layer ( 30 ) sheathed tensile carrier ( 32 ), which is obtainable by a method according to at least one of the preceding claims. Use of one with a polymer layer ( 30 ) sheathed tensile carrier ( 32 ) according to claim 14 as a suspension in a load application, preferably in a conveyor system, in a transport system, in a train system, in a machine for train or power transmission or in an elevator system. Apparatus for the production, in particular for the continuous production, of a tension-carrier coated with a polymer layer, which comprises a pultrusion device ( 16 ) and downstream of it Extrusion device ( 28 ), wherein in the pultrusion device ( 16 ) A heating device is provided.

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