EP2563574A2 - Elément composite renforcé par des fibres à effet actionneur, détecteur et/ou générateur et son procédé de fabrication - Google Patents

Elément composite renforcé par des fibres à effet actionneur, détecteur et/ou générateur et son procédé de fabrication

Info

Publication number
EP2563574A2
EP2563574A2 EP11728176A EP11728176A EP2563574A2 EP 2563574 A2 EP2563574 A2 EP 2563574A2 EP 11728176 A EP11728176 A EP 11728176A EP 11728176 A EP11728176 A EP 11728176A EP 2563574 A2 EP2563574 A2 EP 2563574A2
Authority
EP
European Patent Office
Prior art keywords
fiber
piezoelectric element
fiber structure
composite component
electrically conductive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP11728176A
Other languages
German (de)
English (en)
Inventor
Andreas Giebe
Andreas SCHÖNECKER
Uwe Scheithauer
Thomas RÖDIG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Publication of EP2563574A2 publication Critical patent/EP2563574A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/702—Piezoelectric or electrostrictive devices based on piezoelectric or electrostrictive fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/88—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/01—Manufacture or treatment
    • H10N30/03—Assembling devices that include piezoelectric or electrostrictive parts
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/01—Manufacture or treatment
    • H10N30/09—Forming piezoelectric or electrostrictive materials
    • H10N30/092—Forming composite materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/42—Piezoelectric device making

Definitions

  • the invention relates to actuator, sensor and / or regenerative fiber composite components and a manufacturing method.
  • Fiber composite components are used because of their advantageous mechanical properties and in particular higher specific strengths in lightweight construction.
  • the strength of a matrix material is increased with respect to acting tensile and compressive forces with the aid of a fiber structure embedded therein.
  • the net mass increases, if at all only slightly. In general, the total mass is even smaller in relation to the mass of the matrix material.
  • GRP or CFRP composite components are used for a variety of applications as well as for components where concrete is used as the matrix material. the case is.
  • piezoelectric elements With them, acting forces, deformations and also sound waves can be detected on a component. In addition to the sensory properties of such piezoelectric elements but also their
  • piezoelectric elements have been attached to fiber composite components by being adhesively bonded thereto by gluing.
  • adhesive bond is only suitable to a limited extent, since with it a complete direct transfer of forces is not possible, since a certain degree of elasticity of the adhesive used is required in order to avoid detachment of a piezoelectric element attached in this way.
  • Piezoelectric elements can only be attached where access is possible.
  • a better connection can be achieved in that a receptacle for a piezoelectric element is formed on a fiber composite component by removing material, in which it can be additionally fixed in a form-fitting manner. It is obvious that this creates a significant, the strength substantially affecting impurity on a fiber composite component.
  • At least one piezoelectric element of fibers or yarn is fixed and positioned within a fiber structure or by means of fibers or yarn on a fiber structure.
  • the one or more piezoelectric element (s), electrically conductive connections and the fiber structure are embedded in a matrix material.
  • matrix material the usual materials for fiber composite components, such.
  • Polymers resins, duro- or thermoplastic polymers
  • concrete can be used. This can also be a polymer concrete.
  • the fibers also the usual fiber materials can be used.
  • the fiber structure can be produced from pure fibers or fibers which are further processed into yarns using the known textile production methods.
  • a fibrous structure can form a textile semifinished product, if appropriate in the form of a textile planar structure.
  • Fibers can also be connected to one another in a material-locking manner, which is e.g. can be achieved by gluing or welding.
  • Piezoelectric element (s) according to the invention can be woven into the fiber structure, twisted therein, inserted and / or attached thereto by a sewing or embroidery connection. This may also be the case with the electrically conductive connections.
  • electrically conductive yarns, wires or strands of thin wires twisted together can be used.
  • a fixing of piezoelectric elements to a fiber structure is also possible in that at least one piezoelectric element is formed in at least one of the textile fiber structure Absorption, introduced in the form of a loop or pocket and thereby positively fixed already at / in the fiber structure, before subsequently the matrix material cured, melted and consolidated again (in thermosplastic polymer) or completely polymerized.
  • a matrix material can also be infiltrated after the introduction of piezoelectric elements or injected into a suitably prepared mold.
  • Piezoelectric elements are therefore integrated with fibers or yarn in the fiber structure or attached thereto. They can be incorporated into the fiber structure at the same time, for example by being woven into it. The same applies to the electrically conductive connections. In this case, the positioning and fixation in one
  • Terminal contacts of the piezoelectric elements can be obtained by simple removal of an insulating layer in regions.
  • An electrically conductive connection such as a metallic wire, may be attached to or in the fiber structure, that it is applied directly to a terminal contact and so the electrically conductive connection can be achieved.
  • an electrically conductive connection such as a metallic wire
  • Fibers formed piezoelectric elements are used. Because of their shape, they can be processed particularly favorable. With them but due to the shape of a good use is possible. There may be preferred directions of action both when using as
  • the mechanical loads of a fiber composite component can be taken into account, in which frequent repetitive same or similar influences occur. It can also be at least one area of one
  • Fiber composite component are provided with piezoelectric elements, which is the most heavily loaded to perform a condition monitoring can be detected in the occurred defects and / or can be concluded on the remaining available life remaining. Trained as fibers piezoelectric elements are characterized by a high
  • Cross-sectional geometry can be selected adapted to the particular application of a fiber composite component. It is therefore not necessary to comply with a circular or oval cross-section in the case of the fibers. The choice can be made cross-sectionally independent.
  • Piezoelectric elements can form a series arrangement on a fiber composite component.
  • their longitudinal axes should each be aligned parallel to one another.
  • larger areas of a fiber composite component can be monitored or influenced in the same way in the same way. the.
  • fiber-shaped piezoelectric elements can also be aligned in a common axis with their longitudinal axes, so that a greater length in this axial direction can be taken into account.
  • a plurality of fiber-shaped piezoelectric elements can additionally be encased by fibers and / or a material in such a way that the piezoelectric elements connected to one another form a correspondingly extended coherent piezoelectric element.
  • connection contacts can be present or exposed at each individual piezoelectric element arranged in such a way that each of the piezoelectric elements is individually contacted and accordingly usable individually.
  • a sheathing may be formed by wrapping with thread or yarn material, a coating or by enclosing it in a tubular structure.
  • a jacket can extend over the entire length of the piezoelectric elements to be joined together. In areas where two piezoelectric elements touch or overlap, an enclosure may be reinforced and of greater strength than in intermediate areas. Within the jacket, it is also possible for electrically conductive connections to be guided from one piezoelectric element to other piezoelectric elements.
  • connecting contacts may be present on piezoelectric elements, via which electrical contacts can be made for an actor action.
  • voltage can be supplied or removed for a sensory or regenerative effect or electrical energy.
  • Terminal contacts may be obtained, for example, by localized removal of a dielectric coating from a piezoelectric element.
  • terminal contacts may be formed annularly or with a plurality of segments around the circumference.
  • an input or output of electrical voltage with an electrical potential difference or as an electrically positive and negative voltage can take place.
  • Piezoelectric elements formed as hollow fibers may be embedded in an electrically conductive matrix material. It is also possible to use an electrically conductive fiber structure alone or in addition to an electrical contact.
  • the fiber structure may be electrically conductive or so coated.
  • the inner circumferential surface or a part thereof may form an electrical connection contact of a piezoelectric element designed as a hollow fiber.
  • An electrically conductive connection to the correspondingly different electrical pole can be made to a connection contact present on the outer jacket of the hollow fiber by means of a, as already mentioned, electrically conductive connection or with sufficient electrical conductivity over the electrically conductive matrix material.
  • an actuatory effect can be achieved by applying an electrical voltage and resulting expansion of a piezoelectric element, which in turn lead to a deformation of and / or the introduction of mechanical stresses into the fiber composite component.
  • sound waves can also be emitted and then detected with sensors.
  • the actoric effect can be influenced by changing the applied electrical voltage. This can affect, inter alia, the frequency and amplitude.
  • the electric energy can also be stored in a suitable and electrically connected electric energy storage element and used later.
  • a proportional electrical voltage can be generated on a piezoelectric element and tapped and measured via the electrically conductive connections.
  • a piezoelectric element forms a sensor or generator.
  • piezoelectric elements in the fiber composite component are arranged in a plane that is located outside the neutral fiber of the fiber composite component. Due to the asymmetry in relation to this plane, which can be achieved in this way, the distance between the planes in the plane can be determined a piezoelectric element is arranged with respect to the neutral fiber, amplification effects are utilized, for example, for a deformation or detection.
  • a fiber structure adapted to the requirements of the respective fiber composite component, can be manufactured using the various known production methods.
  • weaving for example, it may also be possible to co-process piezoelectric elements and a manufacturing step to form the fiber structure and to fix piezoelectric elements by weaving simultaneously positioned in the fiber structure.
  • advantageous piezoelectric elements formed as fibers can be woven.
  • the electrically conductive connections can also be woven in and positioned relative to terminal contacts on piezoelectric elements and fixed by means of the woven fiber structure before the embedding in
  • Matrix material is made.
  • piezoelectric elements with threads or yarn to a prefabricated fiber structure. It is therefore simply sewn on or embroidered, whereby the most different types of stitches can be used for stitching or embroidering. However, if possible, a fixation of the piezoelectric elements in all directions should be achieved. It is advantageous to simultaneously sewn or embroider electrically conductive connections at the same positions with the respective piezoelectric element. There, as it were, a knot with crossed or overlapping fibers or yarn is formed, and electrically conductive connections can be positioned with the connecting contacts of piezoelectric elements and fixed there.
  • a fiber structure prepared in this way with a fixed piezoelectric element and electrically conductive connections can be inserted into a mold and then the matrix material can be injected or cast in.
  • Different methods can be used be used.
  • a pressure or centrifugal casting process can be used for the production.
  • the RTM process Resin Transfer Molding
  • the RTM process can be used particularly advantageously. In this case, working in the mold with a negative pressure and infiltrate the matrix material into cavities of the fiber structure.
  • a fiber composite component according to the invention can also be produced in which at least two laminate layers or textile sheet-like structures are produced as a precursor and subsequently the laminate layers are bonded to one another in a cohesive manner by hot pressing.
  • the laminates may have been produced with a fiber structure and a not completely cured or thermoplastic polymer as the matrix material.
  • At least one laminate layer is used, into which at least one piezoelectric element is integrated, that is to say connected to the fiber structure.
  • the pre-product laminate layers can then be stacked in the desired shape, sequence and orientation and joined together in a press at elevated pressure and elevated temperature.
  • suitable resins thermosetting or thermoplastic polymers can be used.
  • a fiber structure may be soaked with a polymer and / or a polymer may be infiltrated into the fiber structure wherein the polymer is not fully cured or polymerized.
  • Hybrid yarns can be used particularly advantageously for the production of a textile fiber structure. These may be formed from reinforcing fibers and fibers formed from thermoplastic polymer. The polymer of the hybrid yarns may then form at least part of the matrix material.
  • a fibrous structure may be made alone, partially or partially from a hybrid yarn.
  • a precursor can also be used in such a way that matrix material deposits are present, in particular in areas in which piezoelectric elements are to be fixed. There, the fiber / yarn content is smaller than the matrix material content. Thereby, a complete inclusion of piezoelectric elements in the matrix material can be achieved.
  • the piezoelectric elements Since the piezoelectric elements, with the already mentioned possibilities in / on the fiber structure in the desired positions and the desired orientation can be sufficiently fixed, their position also changes when casting or spraying of the matrix material, if only insignificant, although it is correspondingly high Forces act as a result of the flow of the correspondingly viscous matrix material. In contrast to sticking piezoelectric elements to a fiber structure, slippage or detachment can be avoided and a secure permanent hold can be achieved. Delaminations, as they are critical in gluing, do not occur.
  • the fibrous structure with the matrix material forms a support structure that breaks the in typically can avoid brittle piezoelectric elements during operation and fabrication.
  • fiber composite components can be made available, are integrated into the piezoelectric elements and thereby positioned very accurately.
  • the matrix material protects them from environmental influences. They can be arranged in the finished fiber composite component at positions which are inaccessible from the outside and can be completely embedded in matrix material.
  • electrically conductive connections different electrical interconnections, e.g. in the form of ring electrodes, series or parallel circuits or a connection to collecting electrodes or a separate control or a separate tap of individual piezoelectric elements possible.
  • the known advantages of fiber composite structural elements are retained and can be extended by the use of piezoelectric elements in their applications.
  • a fiber structure even without a matrix material, can be easily shaped in a short time by cutting, punching or another suitable separation process. In this case, openings can also be formed.
  • a protective layer can also be formed on piezoelectric elements.
  • connection contacts should remain accessible and kept free.
  • fiber composite components according to the invention can. can also be used for the production of electrical energy, since the generated during deformation with piezoelectric elements electrical voltage can be supplied to a use. This can be temporarily stored in a connected suitable electric energy storing element.
  • individual or several piezoelectric elements combined to form groups may be arranged locally separated from one another and thereby form sensitive or actorically acting regions as "islands".
  • Fiber composite components according to the invention can be produced on a large-area and / or large-volume basis. you
  • Use can be done in many technical applications. They can be used, for example, as lightweight components for wind turbines and in vehicle construction. In construction, concrete composite components can be used for construction supervision or in traffic route construction. In the latter case, with such composite components, for example, traffic counts or sensor elements for traffic control can be made available.
  • FIG. 1 shows a schematic form of fibrous piezoe lectric elements that can be integrated or attached to copper wires as electrically conductive connections in a fiber structure;
  • FIG. 2 in schematic form a piezoelectric element which is contactable with copper wires as electrically conductive compounds and
  • Figure 3 fiber composite component with embroidered piezoelectric element.
  • FIG. 1 shows a schematic arrangement of fibrous piezoelectric elements 1 made of PZT, which are arranged parallel to one another.
  • Flexibly deformable copper wires as electrically conductive connections 4, are also aligned parallel to each other and perpendicular to the piezoelectric elements. They are located at points of contact directly on the electrodes 3 of the piezoelectric elements 1, which are arranged at intervals to each other.
  • electrical connection contacts 3 are formed, via which electrical current can flow between piezoelectric elements 1 and electrical connections 4.
  • Two immediately adjacent electrical connections 4 are connected to a respective different electrical pole. In this case, electrically conductive connections 4 can be interconnected / connected to one another with the same polarity.
  • FIG. 2 An arrangement as shown in FIG. 2 can thus be placed on a prefabricated fiber structure (shown in FIG. 1) and fastened with threads or yarn, preferably from the fiber material of the fiber structure, by sewing.
  • threads wrap around the piezoelectric elements 1, the electrically conductive bonds 4 and threads or meshes of the fiber structure.
  • the seams should secure a fixation in all directions, in particular in the region of the nodes where piezoelectric elements 1 and electrically conductive connections 4 (black solid lines) touch.
  • the fiber structure can, in a manner known per se, be a fabric of glass fibers 2.
  • the fibers 2 have no circular cross-section in this example. They are formed as a flat band with rounded edges and lie with the flat sides of the piezoelectric elements 1 at.
  • the fibers 2 are formed as a rowing and form with
  • the fiber structure with attached piezoelectric elements 1 and electrical connections 4 can then be inserted into a mold and at a
  • the fibers 2 are embedded in polypropylene as a matrix material. The temperature is maintained for a period of 10 minutes and then demolded the fiber composite component and cooled to ambient temperature.
  • the structure of piezoelectric elements 1 and electrically conductive connections 4 shown in FIG. 1 was produced by weaving. It can the
  • Fiber structure with . its fibers 2 are woven simultaneously with the copper wires and the piezoelectric elements 1.
  • the piezoelectric elements 1 and the electrically conductive connections 4 made of copper wire are then woven into the fabric.
  • Parallel to the piezoelectric elements 1 are amplifiers kung fibers 5 present, which can be woven as weft with the piezoelectric elements 1.
  • FIG. 2 a possible electrical contacting of piezoelectric elements 1 with copper wires as electrically conductive connections 4 is simplified and shown dispensing with the representation of the fiber structure.
  • on the surface of the piezoelectric elements 1 of an electrically conductive electrode 3 are present.
  • the insulating layer 6 can be removed at positions for the production of the electrically conductive connection and contacting between the piezoelectric element 1 and the copper wires forming the electrically conductive connections 4.
  • a fibrous piezoelectric element 1 is present on an example of a fiber composite component according to the invention.
  • a plurality of copper wires, as electrically conductive connections 4, are present in a parallel series arrangement and aligned at intervals with one another and perpendicularly to the piezoelectric element 1.
  • Both the piezoelectric element 1 and the electrically conductive connections 4 are embroidered on a textile structure in the form of a fiber structure by means of threads 7 and fixed thereto.
  • piezoelectric element 1 Through the regions between piezoelectric element 1 and electrically conductive connections 4, fibers or a yarn with which the actual fiber structure is formed, for example glass fibers, can be guided. With these threads, the piezoelectrical 1 and the copper wires are fixed as electrically conductive connections 4 within the fiber structure before the embedding can be carried out in a matrix material. This can be carried out analogously with a method as described in the example for FIG.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Woven Fabrics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

La présente invention concerne un élément composite renforcé par des fibres ayant un effet actionneur, détecteur et/ou générateur et un procédé de fabrication. L'objectif de l'invention est de mettre à disposition de tels éléments composites renforcés par des fibres qui peuvent être fabriqués simplement et sûrement et qui sont des éléments ayant un effet actionneur, générateur et/ou détecteur qui sont fixés sûrement et positionnés avec précision. L'élément composite renforcé par des fibres selon l'invention présente au moins un élément piézoélectrique qui est fixé et positionné par des fibres ou des fils à l'intérieur de la structure de fibres ou qui est fixé et positionné au moyen de fibres ou de fils à une structure de fibres. Des liaisons flexibles, électroconductrices pouvant être mises en contact depuis l'extérieur de l'élément composite renforcé par des fibres sur et/ou à l'intérieur de la structure en fibres sont amenées à des contacts de raccordement électriques de l'élément ou des éléments piézoélectriques. Un ou plusieurs éléments piézoélectriques, une ou plusieurs liaisons électroconductrices et la structure en fibres sont intégrés dans un matériau matriciel.
EP11728176A 2010-04-28 2011-04-26 Elément composite renforcé par des fibres à effet actionneur, détecteur et/ou générateur et son procédé de fabrication Ceased EP2563574A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010019666A DE102010019666A1 (de) 2010-04-28 2010-04-28 Aktorisches, sensorisches und/oder generatorisches Faserverbundbauteil und Verfahren zu seiner Herstellung
PCT/DE2011/000465 WO2011134462A2 (fr) 2010-04-28 2011-04-26 Elément composite renforcé par des fibres à effet actionneur, détecteur et/ou générateur et son procédé de fabrication

Publications (1)

Publication Number Publication Date
EP2563574A2 true EP2563574A2 (fr) 2013-03-06

Family

ID=44627654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11728176A Ceased EP2563574A2 (fr) 2010-04-28 2011-04-26 Elément composite renforcé par des fibres à effet actionneur, détecteur et/ou générateur et son procédé de fabrication

Country Status (4)

Country Link
US (1) US20130106245A1 (fr)
EP (1) EP2563574A2 (fr)
DE (1) DE102010019666A1 (fr)
WO (1) WO2011134462A2 (fr)

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DE102010019666A1 (de) 2011-11-03

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