The invention relates to a device (1) for the twist-free width change of a fiber strip (2) of continuous fibers (3) passing through the device (1) to a specified effective width (8). The device (1) comprises a transport unit (4) for transporting the fiber strip (2). The device (1) further comprises at least one width change assembly (5) configured such that the width change assembly (5) transfers an initial distance (a) of two adjacent fibers (3) of the fiber strip (2) to a target distance (b) of adjacent fibers (3) of the fiber strip (2). For a large part of the pairs of adjacent fibers (3), the ratio between the target distance (b) and the initial distance (a) matches within a tolerance range of 20%. This results in a reliable and economical device.
An energy-absorbing support structure (1) has an absorbing body (2) consisting of a fiber-reinforced plastic material. The absorbing body is arranged between a support structure abutment component (3) and a support structure impact-absorbing component (4). The absorbing body (2) is designed to absorb energy by deforming from an initial state into a deformed state on the basis of an impact-induced relative movement between the support structure components (3, 4), said energy being introduced into the support structure (1) by an impact. The absorbing body (2) is designed as a body which has already been predeformed in the initial state by an energy absorption compared to an original state. During the production of the support structure (1), the absorbing body (2) is first produced in the original state and then predeformed into the initial state, and finally the absorbing body (2) is connected to the support structure components (3, 4). This results in a support structure which absorbs energy in a predictable and defined manner when energy is introduced by means of an impact.
A fibre composite has a fibre material (5) having filaments (6). Furthermore, the fibre composite has a polymer matrix (8) in which the fibre material (5) is embedded and a bonding agent (9) with which the filaments (6) of the fibre material (5) are coated. The fibre material (5) is selected from at least one of the following materials: glass, carbon, Armid, basalt, polyester, natural fibre. The polymer matrix (8) is a thermoplastic polymer. The bonding agent (9) is based on at least one of the following materials: silane, polypropylene (PP), titanate, aluminium, chromium, zirconium and boron. A materials combination of fibre material/polymer matrix/bonding agent which is particularly suitable for the production of a fibre composite, in particular for the production of tapes composed of the fibre composite, results.
In order to produce a fibre composite material in the form of at least one wide fibre strip (2) impregnated with a polymer, a plurality of prefabricated individual fibre strips (4) is first provided which each have a filament structure that is impregnated with the polymer. The individual fibre strips (4) are brought together to a heat-pressure application device (7). In an entry region (9), the individual fibre strips (4) are delivered into the heat-pressure application device (7) next to one another in such a manner that adjacent lateral edges of the individual fibre strips (4) that have been brought together lie next to one another in abutment regions. The individual fibre strips (4) that are delivered next to one another are heated to a temperature above a melting point of the polymer by the heat-pressure application device (7). This heating is applied over an entire width of the individual fibre strips (4) transversally to their delivery direction. The heat-pressure application device is used to apply pressure to the individual fibre strips (4) that are heated and delivered next to one another. The individual fibre strips (4) that have been brought together are maintained in a processing temperature range above the polymer melting point until the abutment regions of the individual fibre strips (4) that have been brought together have fused together. The individual fibre strips (4) that have fused together to form the wide fibre strip (2) are subsequently cooled. This method, for which a production device is also presented, produces a wide fibre strip that is as homogeneous as possible with respect to its characteristics over its entire width.
B29C 65/02 - Joining of preformed partsApparatus therefor by heating, with or without pressure
B29C 69/00 - Combinations of shaping techniques not provided for in a single one of main groups , e.g. associations of moulding and joining techniquesApparatus therefor
B29C 53/18 - Straightening or flattening of plates or sheets
B29C 43/22 - Compression moulding, i.e. applying external pressure to flow the moulding materialApparatus therefor of articles of indefinite length
B29C 65/04 - Dielectric heating, e.g. high-frequency welding
B29C 65/14 - Joining of preformed partsApparatus therefor by heating, with or without pressure using wave energy or particle radiation
B29C 65/18 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated tool
B29C 70/50 - Shaping or impregnating by compression for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
C08J 5/04 - Reinforcing macromolecular compounds with loose or coherent fibrous material
The invention relates to a device (1) for producing a composite fibre material in the form of a fibre strip (2) impregnated with a polymer, having a transport means (3) for supplying a raw fibre strip (4) and for transporting the fibre strip (2, 4) along a processing path (5). A pre-heating means (9) is used to pre-heat the raw fibre strip to a processing temperature which is higher than a melting point of the polymer. An application means (12) is used to apply the melted polymer to a surface of the raw fibre strip (4) over an entire width of the raw fibre strip (4). At least one pressure-shear-vibration loading means (18, 19) is used to apply a pressure to the raw fibre strip (4) perpendicularly to the strip plane after the polymer has been applied, the pressure being applied in the strip plane and transversely to a strip running direction by means of at least one pressure stamp (20) with simultaneous shear-vibration loading of the pressure stamp (20) by means of a vibration movement component (y). At least one temperature control means is used to keep the raw fibre strip (4) within a processing temperature range above the polymer melting point until after the pressure-shear-vibration loading is finished. This results in a production method and a production device for impregnating a fibre strip of predefined impregnation quality with the lowest possible production outlay.
The invention relates to a support structure (1) having a core (2). Said core comprises natural or wood fibers (3) embedded in an acrylate resin. A jacket (5) of the core (2) is made of a fiber-reinforced plastic. The core (2) has a density along the support structure (1) that varies by more than 10%. The result is a support structure, which can be adjusted to predetermined load requirements in a defined manner.
A47C 23/06 - Spring mattresses with rigid frame or forming part of the bedstead, e.g. box springsDivan basesSlatted bed bases using wooden springs, e.g. of slat type
A63C 5/12 - Making thereofSelection of particular materials
B32B 5/02 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by structural features of a layer comprising fibres or filaments
B32B 5/14 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by a layer differing constitutionally or physically in different parts, e.g. denser near its faces
In a method for producing a moulding on the basis of a plastics profile (1) reinforced with incorporated fibres, wherein the plastics profile is heated and deformed by means of an outer or inner die, the plastics profile has band-like regions (3), which preferably run in the longitudinal direction and, at the moulding temperature of the plastics matrix, become relatively harder and less compliant than the plastics matrix itself and accordingly counteract lateral wave-like deviation of the fibres.
B29C 70/78 - Moulding material on one side only of the preformed part
B29C 70/20 - Fibrous reinforcements only characterised by the structure of fibrous reinforcements using fibres of substantial or continuous length oriented in a single direction, e.g. roving or other parallel fibres
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