DE102012101016A1 - Method for manufacturing profiled fiber reinforced semifinished products for producing fiber reinforced material, involves processing fabric acted upon with pressure and temperature for forming a fiber reinforced semifinished product - Google Patents

Method for manufacturing profiled fiber reinforced semifinished products for producing fiber reinforced material, involves processing fabric acted upon with pressure and temperature for forming a fiber reinforced semifinished product Download PDF

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Publication number
DE102012101016A1
DE102012101016A1 DE201210101016 DE102012101016A DE102012101016A1 DE 102012101016 A1 DE102012101016 A1 DE 102012101016A1 DE 201210101016 DE201210101016 DE 201210101016 DE 102012101016 A DE102012101016 A DE 102012101016A DE 102012101016 A1 DE102012101016 A1 DE 102012101016A1
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Prior art keywords
fabric
weft
warp threads
forming
fiber composite
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DE201210101016
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German (de)
Inventor
Marcel Christmann
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Institut fuer Verbundwerkstoffe GmbH
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Institut fuer Verbundwerkstoffe GmbH
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Priority to DE201210101016 priority Critical patent/DE102012101016A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/40Shaping or impregnating by compression not applied
    • B29C70/50Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • B29C70/504Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06Fibrous reinforcements only
    • B29C70/10Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/22Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03CSHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C13/00Shedding mechanisms not otherwise provided for
    • D03C13/02Shedding mechanisms not otherwise provided for with independent drive motors
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03CSHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00Jacquards
    • D03C3/20Electrically-operated jacquards
    • D03C3/205Independently actuated lifting cords
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03CSHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C9/00Healds; Heald frames
    • D03C9/02Healds
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D25/00Woven fabrics not otherwise provided for
    • D03D25/005Three-dimensional woven fabrics
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D41/00Looms not otherwise provided for, e.g. for weaving chenille yarn; Details peculiar to these looms
    • D03D41/004Looms for three-dimensional fabrics
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00Industrial
    • D10B2505/02Reinforcing materials; Prepregs

Abstract

The method involves forming a fabric (A) from warp threads (5) and weft threads (7), and draping the fabric. The draped fabric is pressurized with pressure and temperature. The fabric acted upon with pressure and temperature is processed for forming a fiber reinforced semifinished product (25). The fabric comprises a polymer, and is acted upon with pressure and temperature such that the polymer melts. The warp thread is freely slippable when draping the fabric. An independent claim is included for a device for manufacturing a profiled fiber reinforced semifinished products.

Description

  • The invention relates to a method for producing a profiled fiber composite semi-finished product, a semi-finished fiber composite produced therefrom, a fiber composite material and a device for producing a profiled fiber composite semifinished product.
  • Specifically, the application relates to a method for producing a profiled fiber composite semi-finished product in the form of a semifinished product made of a fiber-plastic composite (FKV), a subsequently produced semi-finished product made of a fiber-plastic composite material, a fiber-plastic composite material and an apparatus for producing a profiled semi-finished product in the form of a fiber-plastic composite material.
  • To produce a fiber composite material, fibers are impregnated with a molten polymer, in particular a thermoplastic or a duroplastic. During the impregnation, the fibers are usually subjected to pressure in order to solidify the composite of fibers and polymer and, in particular, in order to be able to achieve a substantial or complete impregnation of the fibers. This solidification and extensive or complete impregnation is generally referred to as consolidation. After completion of the impregnation or consolidation of the composite of fibers and polymer, the polymer is allowed to harden or converts the polymer into a solid state of aggregation, as far as thermoplastic polymers are used. After the polymer has hardened, a fiber composite material is obtained, which is formed from a plastic matrix in which the fibers are embedded and act as reinforcing fibers for the plastic.
  • Corresponding formed fiber composites are nowadays used in numerous fields, for example in the automotive industry or in the aerospace industry.
  • Fiber composite semifinished products are produced, for example, in the form of plates or profiles, in particular also in the form of endless plates or profiles. These endless panels or profiles can be cut to a desired length at a later time and form a fiber composite in a desired geometry after reflowing the thermoplastic polymer, reshaping the semifinished product, and cooling the polymer.
  • Fiber composite semi-finished products, especially in endless form, are also regularly required in profiled form, for example in the form of stringers, profiles or straps.
  • The problem in the production of such profiled fiber composite semi-finished products is in particular that the spatial freedom of design is very limited due to the low elastic deformability of the fibers in the drapery or the molding process. For example, the maximum possible elongation for carbon fibers is only about 1.6% and for glass fibers only about 5.7%. Due to this low deformability of the reinforcing fibers, for example, fiber composite semi-finished products in the form of very strongly curved profiles can not be produced at all.
  • One possibility for the production of profiled composite semifinished products, in particular strongly curved profiled fiber composite semifinished products, is the radial pultrusion. In this process, which is modified by the pultrusion method, the reinforcing fibers together with the matrix material are not drawn through a shaping die, but the nozzle moves over the fixed fibers. A disadvantage of this method is that not arbitrary fiber alignments can be realized.
  • Another possibility for producing profiled fiber composite semi-finished products is a direct production or forming process. Here, textile fabric structures or fabric structures by means of a manufacturing method, for example, a static pressing method, autoclave or diaphragm method, transformed into an endless profile. Alternatively, polymers in organic sheets, ie already impregnated and consolidated finished semi-finished products, can be brought into the molten state and then the organo sheets are formed in a tempered tool below the melting temperature of the matrix material. In both methods is disadvantageous that either only small curvatures can be realized or the necessary drapability of the fabric can be achieved only with textiles that are not reinforced in zero-degree direction or circumferential direction.
  • The invention is based on the object to provide a method for producing a profiled fiber composite semi-finished, can be provided by the profiled fiber composite semi-finished, especially endless profiled fiber composite semi-finished, with a wider range of variation and with a more variable profiling, as with the method is possible according to the prior art. In particular, a profiling with small radii or strongly curved areas should be possible. Another object is to provide such a method for To provide, through which profiled fiber composite semi-finished products are continuously produced.
  • Another object of the invention is to provide a fiber composite material which is produced with such a fiber composite semi-finished product.
  • Finally, a further object of the invention is to provide an apparatus for producing a profiled fiber composite semifinished product, by means of which profiled fiber composite semifinished products can be produced with a greater variation in profiling than is possible with the devices according to the prior art. In particular, should be possible by the device, the continuous production of such fiber composite semi-finished products.
  • The first object is achieved by the provision of a method for producing a profiled fiber composite semifinished product, which comprises the following steps:
    • - forming a fabric of warp threads and weft thread;
    • - draping the fabric;
    • - pressurizing the draped fabric with pressure and temperature;
    • - Further processing of pressurized and temperature tissue to form a fiber composite semi-finished, wherein
    • - The pressure and temperature acted upon tissue contains a polymer and the tissue is subjected to such pressure and temperature, that the polymer melts, and wherein
    • - When draping the fabric is present at most in a length at which when draping the fabric, the warp threads are freely slipped.
  • A basic idea of the invention is that the fabric during draping is at most of a length at which the warp threads can be freely slipped when the fabric is draped. Accordingly, during draping, the fabric is designed in such a way that the warp threads can slip during draping or can slip relative to the weft thread. This makes it possible to drape the fabric substantially arbitrarily, since the warp threads in a drape for a desired length for the drapery of the fabric, so that the fabric neither wrinkles, nor the threads are overstretched or rows, nor a desired drape a small radius of the tissue would be impossible due to the limited extensibility of the threads of the tissue.
  • That the fabric during draping is at most in a length at which the warp threads are freely slidable when draping the fabric, the weft of a fabric which is used to produce a fiber composite semi-finished, a maximum of such a length or over such a maximum number of shots registered in the fabric that the warp threads are still freely slipped during draping. During draping, the fabric is thus present at most in such a length that each warp thread can be freely displaced relative to each of its points of intersection with the weft thread. In contrast to the prior art, the fabric is thus not formed endlessly before its draping, but at most in such a length in which the warp threads can slip or slip after. In principle, it is possible to drape a woven fabric, which is formed in such a length according to the invention, in the process direction as well as in the radial direction to any desired profile geometries. In particular, profiled semi-finished fiber composite products with profile geometries can be produced by the method according to the invention, which also have extremely small radii, or are strongly curved.
  • In endless fabrics, it is not possible due to the friction between warp and weft that the warp threads slip freely when draping the fabric. Because from a certain length of the fabric or a certain number of weft entries existing between warp and weft yarn frictional forces exceed the tensile force that would be applied to pull the warp threads over the entire length of the fabric can without tearing the warp threads. However, according to the invention, during the draping of the fabric, the weft thread alone is introduced into the fabric over such a length or inserted into the fabric in such a number of wefts that the warp threads during the draping of the fabric from the region of the drapery of the fabric to the last weft insertion of the fabric Tissue are freely slipped. To this end, the fabric alone is formed in such a length that the gathering forces between the warp yarns and the weft yarn in the region of the fabric extending between the region of the drape of the fabric and the last weft insertion is less than the tensile force to be applied in order to be able to distort the warp threads in this area of the fabric as desired or to be able to pull over the points of intersection with the weft thread without the warp threads tearing. This allows the warp threads in the draping of the fabric in this area of the fabric to slip as desired without tearing the warp threads.
  • In particular, an endless profiled fiber composite semifinished product can be produced by the method according to the invention. For this purpose, in successive cycles, a tissue of arbitrary length (hereinafter referred to as "endless tissue") is made up of successive sections according to FIG Accordingly, each fabric section according to the invention formed in particular of warp and weft and then draped, each fabric section is present at draping at most in a length at which when draping the fabric section the Accordingly, the endless fabric consists of successive sections of fabric, each made according to the method described herein.
  • For the tissue sections, the statements made herein relating to the tissue produced by the method according to the invention accordingly apply accordingly.
  • The correspondingly formed, endless fabric can, preferably in sections and at intervals, be subjected to pressure and temperature, so that the polymer of the fabric melts and can be further processed to form an endless fiber composite semifinished product.
  • To produce the endless fabric, the weft thread can be entered into warp threads in each cycle over a number of shots such that in each case a fabric or a fabric section in the length according to the invention is created. After this fabric section has been correspondingly formed and draped, the weft insertion into the warp threads is continued in a new cycle, wherein in this new cycle the weft thread is again inserted into warp threads over such a number of wefts that this in turn creates a fabric section in the length according to the invention becomes.
  • The fabric is preferably made by means of a weaving machine with a shed forming device, in particular, for example, a jacquard machine. In weaving machines with a shed forming device, a fabric is formed by inserting a weft thread into the shed respectively formed by warp threads in successive cycles of motion of a shed forming device. A shed is formed by elevating a first number of warp threads upwardly through the strands of the shed forming device thereby forming a top shed and pulling a second number of warp threads down through the strands thereby forming the shed bottom shed. The gap formed between the upper compartment and the lower compartment is called a shed. Through this shed the weft insertion of the weft thread takes place. Methods and techniques for forming a warp and weft fabric are known to those skilled in the art. In principle, all devices and methods known to those skilled in the art for forming a warp and weft fabric may be used to form the fabric in the process of the present invention.
  • During draping, the fabric formed is provided with a profile, that is to say with a profiled cross section. In particular, the fabric can be provided by the drapery with complex profile geometries.
  • According to the invention, when the drape is present in the drape at most in a length at which the warp threads can be freely slipped when draping the fabric, the fabric can be draped without wrinkling, in particular draped into complex profile geometries without wrinkling.
  • During draping, the fabric is brought in particular into a profile geometry corresponding to or adapted to the later semi-finished fiber composite and then subjected to full or extensive retention of this geometry with pressure and temperature over a defined length such that the polymer melts and wets the threads of the fabric.
  • For draping the fabric, the draping devices known from the prior art for draping fabrics, in particular for draping fabrics for producing semi-finished fiber composite materials or fiber composite materials, can be used. Drapery drapery devices regularly have a forming surface over which a fabric is pulled. The molding surface corresponds to the surface geometry or a portion of the surface geometry of the fiber composite semifinished product or fiber composite to be produced, which is to be formed from the fabric. When the fabric is pulled onto the forming surface of the draping device, the fabric conforms to the shape of the forming surface, so that the fabric assumes the surface geometry of the fiber composite product to be produced from the fabric. As a result, in particular the creation of complex profile geometries is possible. In particular, this allows, for example, endless profile geometries with a complicated geometry or a complex cross section to be formed.
  • The warp yarns and the weft yarn from which the fabric is formed may, in principle, be formed from any of the prior art fabrics for fiber composite semi-finished products or fiber composite materials known in the art. The warp threads and the weft yarn can therefore for example Reinforcing fibers may be formed of an organic or inorganic material. For example, the warp yarns and the weft yarn may be formed of reinforcing fibers of glass, aramid, carbon or polyamide.
  • According to the invention, the tissue, when it is applied according to the invention with pressure and temperature, a polymer. That a fabric used to make a fiber composite semi-finished product comprises a polymer is basically. known from the prior art. In that regard, in order to provide a polymer exhibiting tissue for carrying out the method according to the invention, the techniques known from the prior art can be used.
  • For example, the polymer can be applied in the form of granules or spray before or after the formation of the fabric on the warp and weft threads. For example, the warp and weft threads or the fabric formed from these can also be passed through a dip bath with the polymer, for example a solution, a dispersion or a melt of the polymer. In all of the abovementioned application methods, provision may be made, in particular, for the polymer to be applied to the fabric only after the draping of the fabric, since otherwise the polymer may hinder the free slippability of the warp threads during draping.
  • According to one embodiment, it is provided that the polymer is brought together in the form of fibers with the warp and weft threads of the fabric. It can be provided that the warp and weft threads of the fabric before or during the formation of the fabric are combined with polymer fibers. For example, it may be provided that the polymer fibers are interwoven with the warp threads and the weft thread in the formation of the fabric.
  • According to a particularly preferred embodiment, it is provided that the weft thread and / or part of the warp threads and / or all warp threads are present as a yarn of reinforcing fibers and polymer fibers, so-called "mixed yarn" or "hybrid yarn", which are woven together in the formation of the fabric.
  • The polymer with which the threads of the fabric are combined can in principle be any polymer known from the prior art for the production of fiber composite semi-finished products or fiber composite materials. A polymer in the form of a thermoplastic is preferably used, for example a polymer in the form of polyphenylene sulfide (PPS), polyether ketone (PEK) or other polyether ketone (for example PEKK), polyamide (PA), polyetherimide (PEI), polyoxymethylene (POM) or polyethylene terephthalate ( PET).
  • The application of pressure and temperature to the draped fabric can in principle be carried out by any means known from the prior art for applying a fiber-polymer composite or a fabric of reinforcing fibers and polymer with pressure and temperature.
  • According to a preferred embodiment, it is provided that the fabric formed and draped in the length according to the invention is in each case subjected to pressure and temperature in one process step or in one printing process. This makes it possible to synchronize the formation and draping of the fabric on the one hand and its application to pressure and temperature on the other hand, so that the production of the profiled fiber composite semi-finished product can be carried out in a continuous process. The same applies accordingly in the production of an endless fabric by the method according to the invention, wherein in this case the fabric sections are successively subjected to pressure and temperature in each case in one process step. As a result, an endless, profiled fiber composite semifinished product can be produced contemporarily - like an interval.
  • After exposure of the fabric with pressure and temperature, this can be further processed by the known from the prior art methods and techniques for forming a fiber composite semi-finished product. For example, the tissue can be consolidated after or at the application of pressure and temperature and then, for example, cooled. After cooling, the profiled fiber composite semi-finished is finished and can then be trimmed, for example, still to a certain length.
  • Particularly preferably, the draped fabric is subjected to pressure and temperature in an interval hot press. Interval hot presses are known from the prior art. By means of an interval hot press, intermittent successive fabric sections of an endless fabric of filaments and polymer can be subjected to temperature in a mold in such a way that the polymer melts and wets the filaments, wherein the fabric is simultaneously pressurized into a mold unit. In particular, the composite of the thread and the polymer in the interval hot press can also be subjected to pressure and temperature in such a way that the tissue is consolidated.
  • As stated above, the tissue in the method according to the invention preferably by a loom with a shed forming device are produced. In such looms, the weft thread during weft insertion orthogonal to the direction of entry top or bottom each crosses at most one warp, depending on this oh in the top or bottom of the shed is arranged. A fabric produced by a weaving machine with a shed forming device, in particular a jacquard machine, thus has a maximum thickness of two thread diameters, namely the thickness of a warp thread and of the weft thread crossing or wrapping around it.
  • For many applications, however, it is desired that a fabric have a greater thickness, for example for the production of multilayer fiber composite semi-finished or fiber composites. For this purpose, it has hitherto been known to arrange a plurality of fabrics one above the other and to join them together, for example, to interweave or to sew together. However, such a procedure is cumbersome. Furthermore, the connection of the fabric layers is often insufficient with each other, so that they can often move against each other.
  • According to the invention can now be provided that the fabric is formed by a loom with a shed forming device, wherein at least the warp threads are arranged in multiple layers in the upper shed or lower shed. The warp threads can therefore be arranged in multiple layers in the upper compartment or in the lower compartment or both in the upper compartment and in the lower compartment of the shed.
  • According to the invention, it can accordingly be provided that at least a part of the warp threads is arranged one above the other, that is, at least a part of the warp threads are arranged one above the other in the orthogonal direction to the insertion direction of the weft thread. The warp threads are therefore arranged one above the other in at least two layers. In this case, preferably at least two warp threads each are looped through the weft thread. In contrast to the prior art, the weft thread during weft insertion thus not only crosses each one running in the direction orthogonal to the insertion direction of the protective thread warp, but at least in a portion of the shed at least two in the orthogonal direction to the insertion direction of the weft yarn stacked warp threads. In the tissue formed by a corresponding method step, the weft thread thus wraps in sections at least two warp threads arranged one above the other in the orthogonal direction to the insertion direction of the weft thread. Accordingly, three-dimensional fabrics can be formed by this method step, that is to say fabrics which have an extension orthogonal to the weft thread and warp thread direction. According to the invention, it has been found that such three-dimensional interwoven fabrics have positive effects on the interlaminar strength of a fiber composite semifinished product produced by the method according to the invention. Further, such a three-dimensionally interwoven fabric, the number of wraps of the warp threads is reduced by the weft thread due to the reduced relative to the number of Kettfadenlagen weft count, so that such a fabric, for example, easier drape.
  • In combination with the feature according to the invention, according to which the fabric during draping is at most of a length at which the warp threads are freely slidable when draping the fabric, three-dimensional interwoven fabrics can be produced by this method feature, which at the same time can be used in complicated profile geometries, especially with small ones Radii in warp direction, are drapable.
  • Preferably, the weft yarn is added at successive weft entries always offset by one position. Insofar as the warp threads are arranged, for example, in four layers, the following applies: the weft thread connects layers 1 and 2 during the first weft insertion, layers 2 and 3 during the second weft insertion, layers 3 and 4 during the third weft insertion, layers 4 and 4 at the fourth weft insertion 3, at the fifth weft insertion the layers 3 and 2 and at the sixth weft insertion the layers 2 and 1, wherein the next weft insertion again connects the layers 1 and 2 and the cycle starts again.
  • According to a preferred embodiment, it is provided that the warp threads are arranged in multiple layers during weft insertion both in the upper compartment and in the lower compartment, so both in the upper compartment and in the lower compartment, the warp threads are arranged in the orthogonal direction to the insertion direction of the weft yarn on each other.
  • In principle, the warp threads can be arranged in any number of layers one above the other or in multiple layers, for example, be arranged one above the other in two, three, four or five layers. Preferably, the warp threads over the entire width of the shed, so the entire length of the weft insertion in the shed, multi-layered arranged one above the other.
  • According to a preferred embodiment, it is provided that the weft insertion takes place in successive weft insertion between different layers of the warp threads. This makes it possible to produce a three-dimensional fabric firmly interwoven by all warp thread layers.
  • For guiding and for raising and lowering the warp threads in a weaving device with a shed forming device, a warp thread is in each case guided through a heddle eye formed on a strand, that is, an eyelet formed on the strand. By lifting and lowering of the strand, through the Litzenauge a warp thread is performed, this can each be raised and lowered a warp thread. For the inventive, multi-layer arrangement of the warp threads can be provided that are formed on strands of the shed forming mechanism each have a plurality of Litzenaugen are guided by the warp threads. In contrast to the prior art, not only in each case one stranded eye is formed on each strand, through each of which a warp thread is executed. Rather, in the method according to the invention, the fabric can be formed by a shed forming device in which at least two stranded eyes are formed on at least one part of the strands, through which at least one warp thread is guided. As a result, warp threads in the orthogonal direction can be arranged one above the other by insertion of the weft thread and form a fabric with a plurality of warp thread layers arranged one above the other.
  • According to the desired number of Kettfadenlagen in the tissue each of the strands of the desired number of Litzenaugen spaced apart from each other and the warp threads in the formation of the fabric thereby guided. In order, as above, to allow a weft insertion of the weft thread in successive weft entries between different Kettfadenlagen, can be provided according to the invention that the Litzenaugen on each strand spaced from each other or are arranged one above the other, that the weft during weft insertion between the through the spaced Litzenaugen guided warp threads is feasible.
  • According to a preferred embodiment it can be provided that the Litzenaugen are slidable against each other on the strands. As a result, let the distance of the warp threads, which are guided by the Litzenaugen a strand set, and thus the distance of the warp thread layers in the formation of the fabric.
  • According to a preferred embodiment it can be provided that the weft thread is guided between a successive weft insertion to form the fabric around a wrapping body.
  • It can be provided that a plurality of such wrapping bodies are provided, which are each arranged laterally of the fabric or laterally of the respective outer warp thread.
  • The advantage of such a wrap-around body arranged laterally on the fabric lies, in particular, in the fact that the fabric can be held and transported by the wrapping bodies which are looped around by the weft thread. In particular, multi-layered tissue can be securely held laterally by the belt body and transported.
  • It is preferably provided that in each case a number of wrapping bodies is arranged on both sides of the fabric. As a result, the fabric can be safely guided and transported in warp direction. In particular, it can be provided that the wrapping bodies, which are looped around by the weft thread, are moved, as a result of which the fabric can be safely entrained or transported.
  • It can be provided that the tissue is transported by a transport mechanism known from the prior art and the wrapping bodies are moved synchronously laterally of the tissue. In this case, the wrap bodies serve in particular for the lateral hold of the tissue.
  • The wrapping bodies may be for example rod-shaped or cone-shaped, particularly preferably with a free end. This has the advantage that the fabric can be easily removed from the Umschlingungskörpern at any time. Preferably, the wrapping bodies are arranged on a base, for example a chain, a band or a rail, by means of which a plurality of wrapping bodies are jointly movable. For example, it can be provided that a number of wrapping bodies are respectively arranged on such a common base on both sides of the fabric, wherein it may be provided in particular that the base is moved to transport the fabric or is moved synchronously for transporting the fabric.
  • To solve the further object, a fiber composite semifinished product is produced according to the invention, which according to the invention described herein. Process is made.
  • In order to achieve the further object, the invention provides a fiber composite material which is produced on the basis of a fiber composite semifinished product which has been produced by the process described here.
  • In order to achieve the further object, a fiber composite material with one in a polymer matrix is provided according to the invention embedded fiber fabric, which is formed by a loom with a shed forming device, wherein the warp threads of the fiber fabric are arranged in multiple layers.
  • To achieve the further object, an apparatus for producing a profiled fiber composite semi-finished product is provided according to the invention with the following features:
    • Means for forming a fabric of warp threads and weft thread,
    • Means for draping the fabric,
    • - means for applying pressure and temperature to the draped fabric;
    • - Means for further processing of the acted upon by pressure and temperature tissue for forming a fiber composite semi-finished, wherein
    • - The means for acting on the tissue with pressure and temperature are designed such that a, a polymer-containing tissue can be acted upon with pressure and temperature such that the polymer melts, and wherein
    • - The means for forming and draping the fabric are formed such that the fabric is present during draping at most in a length at which the draping of the fabric, the warp threads are freely slipped.
  • The means of the device according to the invention may be the means described here for carrying out the method, or may be designed such that the method steps of the method according to the invention described herein are executable by them.
  • According to a preferred embodiment, it is provided that the means for forming the tissue are formed movable to the means for applying pressure and temperature to the draped tissue. Such movability of the means for forming the fabric is particularly advantageous in the manufacture of an endless fabric, as the formation of a web portion of the endless web through the means for forming the web, regardless of the process speed of the means for applying the pressure and temperature to the draped web which another tissue section is subjected to pressure and temperature can be performed. In particular, in this embodiment, the movable means for forming the tissue may be a shed forming device and the means for pressurizing and temperature applying the tissue may be an interval hot press.
  • Further features of the invention will become apparent from the dependent claims, the figures and the associated description of the figures.
  • All of the features of the invention described herein may be combined with each other, individually or in combination.
  • A highly schematic embodiment of the invention will be explained in more detail with reference to the following description of the figures.
  • It shows
  • 1 a top view of an inventive device for carrying out the method according to the invention
  • 2 a view of the device according to 1 of the page,
  • 3 a view of the strands of the device according to 1 as well as the
  • 4 . 5 and 6 three schematic sectional views through a device according to 1 formed tissue along three different cutting planes perpendicular to the warp direction.
  • The device for producing a profiled fiber composite semi-finished in 1 is in its entirety by the reference numeral 1 characterized.
  • The device 1 comprises means for forming a fabric A of warp threads 5 and a weft 7 in the form of a shed forming device 9 , The device 1 further comprises means for draping the fabric A in the form of a draping device 11 and means for subjecting the draped and polymerized fabric A to pressure and temperature in the form of an interval unit press 13 ,
  • The shed forming device 9 includes strands 11 , each perpendicular to the plane according to 1 extend and each three Litzenaugen 13 include, as in 3 shown.
  • In 3 is the structure of the strands 11 shown in more detail, wherein 3 a view on the strands 11 according to 1 from the left shows.
  • Every strand 11 includes three wire eyes 13 , with each other at a distance from each other or stranded wire 11 are formed. Through each Litzenauge 13 each is a warp thread 5 guided. On the top are the strands 11 on winding units 15 the shed forming apparatus 9 windable and unwindable. When winding on a winding unit 15 becomes the respective strand 11 lifted and lowered when unwinding. At its lower end are the strands 11 each by springs 17 pretensioned, so that the strands 11 are held in a biased, vertical position during winding and unwinding. The through the Litzenaugen 13 guided warp threads 5 be when lifting and lowering the strands 11 according to the up and down movement of the strand 11 raised and lowered.
  • In the embodiment according to 3 becomes the weft 7 entered in the direction S in a shed W, which is formed from a top compartment O and a lower compartment U. The upper compartment O is formed of a first number of warp threads 5 and the sub-compartment U of a second number of warp threads 5 , Both in Oberfach O and in the lower compartment U are the warp threads 5 each arranged in two warp layers, which in 2 are indicated in the upper compartment by the dashed lines L1 and L2 and in the sub-compartment U by the dashed lines L3 and L4. There are three warp threads each 5 on each strand 11 by three superimposed Litzenaugen 13 are in the area of each strand 11 three warp threads each 5 orthogonal to the insertion direction S of the weft thread 7 arranged.
  • In this way, a three-dimensional fabric with superimposed warp thread layers L1, L2, L3, L4 can be created, wherein the weft 7 several warp threads arranged one above the other 5 wraps. The wrap of the warp threads 5 through the weft 7 in the area of the fabric A, which by the weft insertion according to 3 is created shows 4 ,
  • According to the invention, the weft insertion in successive weft insertion between different Kettfadenlagen done. This allows warp threads 5 in successive weft insertion in any position through the weft 7 entwine. Examples are in the 5 and 6 shown. For example, in the area of the fabric A according to 5 three warp threads each 5 from the weft 7 wrapped around and in the area of the fabric A according to 6 alternately two and three warp threads 5 from the weft 7 entwined.
  • When carrying out the method according to the invention on the device 1 according to 1 becomes the weft 7 after each weft insertion around a cone-shaped wrapping body 19 guided. The wrap bodies 19 are on two arranged on both sides of the fabric A tapes 21 attached. The wrap bodies 19 are at such a distance to each other on the bands 21 attached that weft thread 7 after each weft insertion in each case around a loop body 19 is feasible before a new weft insertion takes place. As 2 shows are the bands 21 designed around the clock. Furthermore, Figure shows that the winding units 15 each by a motor 16 are drivable. Good to see in 2 furthermore, the three over each other to a strand 11 arranged Litzenaugen 13 , through each a warp thread 5 is guided.
  • By the weft 7 of the fabric A to both sides of the fabric 3 each around wrap body 19 is guided, the fabric A is laterally firmly held, so that it is especially in the drapery in the draping device 11 is very advantageous halterbar and drapable.
  • The fabric A is by a - not shown - transport device of the shed forming device 9 in the direction of the interval hot press 13 transported. The conveyor belts 21 on which the wrap bodies 19 are fixed, are moved synchronously to the transport speed of the fabric A. As a result, the fabric A is advantageously in the draping in the draping device 11 and when applying pressure and temperature in the interval hot press 13 held firmly on the side.
  • In the transport direction of the fabric A behind the shed forming device 9 and before entering the draping device 11 has the device 1 two counter-rotating inlet and compaction rollers 23 on, of which a role 23 above and another role 24 is arranged below the fabric A. Through these inlet and compaction rollers 23 . 24 become the warp threads 5 and the weft 7 in the shed forming device 9 formed tissue A combined.
  • The warp threads 5 and the weft 7 of the fabric A consist of a yarn which is formed of reinforcing fibers in the form of endless glass fibers and fibers of a thermoplastic polymer. In this way, this points out the corresponding formed warp threads 5 and the weft threads 7 formed fabric A a polymer, in the exemplary embodiment, a thermoplastic polymer.
  • In the transport direction of the fabric A behind the inlet and Kompaktierungsrollen 23 . 24 is the drapery device 11 arranged. The draping device 11 is formed such that the fabric A in the draping device 11 draped into a profiled geometry.
  • How out 1 can be seen, the weft insertion of the weft thread 7 - In the transport direction of the fabric A - immediately before the inlet and Kompaktierungsrollen 23 . 24 , which in turn directly in the transport direction of the fabric A before the Drapierrichtung 11 are arranged. This is due to the draping device 11 to fabric A only in such a small length before that the warp threads 5 during drapery of the fabric A in the draping device 11 are still free to slip.
  • Because of the relatively short length of the fabric A, only relatively few wraps of each warp yarn are produced 5 with the weft 7 between the area of the draping device 11 , in which the fabric A is draped, and the last weft insertion S. This is when draping the fabric A in the draping device 11 a slipping of the warp threads 5 over the formed length of the fabric A possible.
  • In the device 1 Now is made of several, successive sections of the fabric A, each formed and draped according to the fabric section A, an endless fabric 3 educated. In this case, after each section of a fabric A is formed and draped, the next fabric section A is created by the entry of the weft thread 7 in the warp threads 5 is continued to form a new fabric section A and this fabric section A is draped. For this purpose, the shed forming device 9 movable to the interval hot press 13 arranged so that the formation of a tissue section A by movement of the shed forming device 9 can be performed while an already formed and draped fabric section A in the interval hot press 13 rests and there is subjected to pressure and temperature.
  • In the transport direction of the fabric A (or the endless fabric 3 ) immediately behind the draping device 11 is the interval hot press 13 arranged.
  • In the interval hot press 13 that's through the draping device 11 preformed profile fabric A (or endless fabric 3 ) Pressed under temperature in a desired shape or a desired profile. By the application of temperature melt the polymer fibers of the fabric A (or the endless fabric 3 ), so that the tissue A (or the endless tissue 3 ) is wetted by the polymer of the polymer fibers.
  • The interval hot press 13 further comprises a cooling unit through which the pressure and temperature applied tissue A (or the endless tissue 3 ) can be cooled, so that after cooling the fabric A a profiled fiber composite semi-finished product 25 that gets the interval hot press 13 can then be removed.
  • After the fiber composite semi-finished 25 from the interval hot press 13 has been led out, the fiber composite semi-finished 25 the upwardly open pin 19 removed and the fiber composite semi-finished product 25 be cut simultaneously to a desired length. Before the removal of the fiber composite semifinished product 25 from the cones 19 it can be trimmed at the edge. The side over the fiber composite semi-finished product 25 protruding sections of the weft 7 used to wrap the pins 19 served, can then be cut off. Subsequently, a finished created, profiled composite fiber semi-finished product 25 ,

Claims (10)

  1. Method for producing a profiled fiber composite semifinished product, comprising the following method steps: 1.1 Forming a fabric (A) from warp threads ( 5 ) and weft ( 7 ); 1.2 Drape the fabric (A); 1.3 applying pressure and temperature to the draped fabric (A); 1.4 Further processing of the pressure and temperature acted upon tissue (A) for forming a fiber composite semi-finished product ( 25 ), wherein 1.5 the pressure and temperature acted upon fabric (A) contains a polymer and the fabric (A) is subjected to such pressure and temperature, that the polymer melts, and 1.6 the fabric (A) during draping at most in a length when the draping of the fabric (A) the warp threads ( 5 ) are freely slippable.
  2. Method according to claim 1, in which an endless fabric ( 3 ) is formed from a plurality of successive sections of fabrics (A) according to claim 1.
  3. Method according to at least one of the preceding claims, in which the fabric (A) is produced by a weaving machine with a shed-forming device ( 9 ), the warp threads ( 5 ) are arranged in multiple layers (L1, L2, L3, L4) at least in the upper compartment (O) or in the lower compartment (U).
  4. Method according to Claim 3, in which the weft insertion (S) of the weft thread (S) 7 ) in successive weft entries between different warp thread plies (L1, L2, L3, L4).
  5. Method according to Claim 3, in which strands ( 11 ) of the shed forming device ( 9 ) in each case several Litzenaugen ( 13 ) are formed by the warp threads ( 5 ) are guided.
  6. Method according to at least one of the preceding claims, in which the weft thread ( 7 ) between successive weft entries respectively around the side of the fabric (A) arranged wrapping body ( 19 ) to be led.
  7. Composite fiber semi-finished products ( 25 ) produced according to at least one of the preceding claims.
  8. Fiber composite based on a fiber composite semi-finished product ( 25 ) made according to at least one of the preceding claims.
  9. A fiber composite material having a fibrous web embedded in a polymer matrix, which is formed by a loom with a shed forming mechanism, wherein the warp threads of the fibrous web are arranged in multiple layers.
  10. Apparatus for producing a profiled fiber composite semifinished product with the following features; 10.1 Means ( 9 ) for forming a fabric (A) from warp threads ( 5 ) and weft ( 7 ), 10.2 funds ( 11 ) for draping the fabric (A), 10.3 means ( 13 ) to pressurize and heat the draped fabric (A); 10.4 Funds ( 13 ) for further processing of the pressure and temperature acted upon tissue (A) for forming a fiber composite semi-finished product ( 25 ), 10.5 being the means ( 13 ) are configured to apply pressure and temperature to the fabric (A) in such a way that a polymer-containing fabric (A) is subjected to pressure and temperature such that the polymer melts, and wherein 10.6 the means for forming and draping (US Pat. 9 . 11 ) of the fabric (A) are formed such that the fabric (A) during draping is at most in a length at which when draping the fabric (A) the warp threads ( 5 ) are freely slippable.
DE201210101016 2012-02-08 2012-02-08 Method for manufacturing profiled fiber reinforced semifinished products for producing fiber reinforced material, involves processing fabric acted upon with pressure and temperature for forming a fiber reinforced semifinished product Ceased DE102012101016A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106120115A (en) * 2016-07-08 2016-11-16 盐城工学院 A kind of sample loom changing cloth fell and method for weaving thereof
US9725832B1 (en) 2016-02-09 2017-08-08 Albany Engineered Composites, Inc. Weaving multilayer products using multiple warp columns and heddle columns
EP3458633A4 (en) * 2016-05-16 2020-02-19 Georgia Tech Research Corporation Systems and methods for continuous fabrication of woven composite materials

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4218860A1 (en) * 1992-06-09 1993-12-16 Chemnitz Textiltech Forsch Deeply embossed fabric - utilises a reserve of fibre in the form of loops to enable formations to be pressed into a sheet of material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4218860A1 (en) * 1992-06-09 1993-12-16 Chemnitz Textiltech Forsch Deeply embossed fabric - utilises a reserve of fibre in the form of loops to enable formations to be pressed into a sheet of material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9725832B1 (en) 2016-02-09 2017-08-08 Albany Engineered Composites, Inc. Weaving multilayer products using multiple warp columns and heddle columns
WO2017139167A1 (en) * 2016-02-09 2017-08-17 Albany Engineered Composites, Inc. Weaving multilayer products using multiple warp columns and heddle columns
EP3458633A4 (en) * 2016-05-16 2020-02-19 Georgia Tech Research Corporation Systems and methods for continuous fabrication of woven composite materials
CN106120115A (en) * 2016-07-08 2016-11-16 盐城工学院 A kind of sample loom changing cloth fell and method for weaving thereof

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