Abstract: An object of the present invention is to provide a carbon fiber which exhibits excellent strength development rate when used in a composite material. The present invention that solves the problems is a carbon fiber which simultaneously satisfies the following formulae (1) and (2): Lc/d?3??(1) TS×d×Lc>6.0×105??(2) wherein: Lc is an X-ray crystallite size (?), d is a filament diameter (?m), and TS is a strand tensile strength (MPa).

Abstract: A textile reinforcement for integrating into concrete, having carbon fibers. The reinforcement is coated with a layer which protects against oxidation, wherein the carbon fibers are provided in the form of an interlaced, twisted, or cabled thread structure and have 5 wt. % of matrix resin, and the layer which protects against oxidation is a separate layer and can produce a chemical bond to a component of the concrete. The invention additionally relates to a concrete part which has a textile reinforcement.

Abstract: An object of the present invention is to provide a carbon fiber which exhibits excellent strength development rate when used in a composite material. The present invention that solves the problems is a carbon fiber which simultaneously satisfies the following formulae (1) and (2): Lc/d?3??(1) TS×d×Lc>6.0×105??(2) wherein: Lc is an X-ray crystallite size (?), d is a filament diameter (?m), and TS is a strand tensile strength (MPa).

Abstract: An object of the present invention is to provide a carbon fiber which exhibits excellent strength development rate when used in a composite material. The present invention that solves the problems is a carbon fiber which simultaneously satisfies the following formulae (1) and (2): Lc/d?3??(1) TS×d×Lc>6.0×105??(2) wherein: Lc is an X-ray crystallite size (?), d is a filament diameter (?m), and TS is a strand tensile strength (MPa).

Abstract: A multiaxial textile fabric has at least two thread layers and at least one nonwoven layer. Each thread layer is made of multifilament reinforcement yarns arranged parallel to one another and so as to lie adjacently next to one another within the thread layers, wherein at least one thread layer is at least partially directly contacted by the nonwoven layer, and cut-out sections are provided within the nonwoven layer, the cut-out sections having a size of at least 4 mm2. The multiaxial textile fabric also includes a fiber-reinforced composite material.

Abstract: A filler preform in a wedge form includes reinforcing fiber bundles consisting of reinforcing fiber filaments, wherein the filaments are directed parallel to each other within the fiber bundle, wherein the fiber bundle contains a first resin composition in a concentration in the range from 1 to 10 wt. % relative to the fiber weight, wherein the fiber bundles have a length in the range from 2 to 20 mm and at least 60% of the fiber bundles are reversibly fixed in a curved form within the wedge filler preform whereby flanks of the curved fiber bundles create an opening angle of less than 120° and the opening angle of the curved fiber bundles relates with an opening angle of the wedge form of the wedge filler preform. A method for producing the wedge filler preform and a method for producing a reinforcing fiber composite include a filler perform.

Abstract: A braided radius filler, including at least three carbon yarns wherein at least one carbon yarn is a continuous carbon filament yarn and at least two carbon yarns are braided together with each other, wherein at least one continuous carbon filament yarn contains a resin composition in a concentration in the range from 1 to 10 wt. % relative to the fiber weight of the continuous carbon filament yarn and the total amount of resin in the radius filler is less than 10 wt. % relative to the total fiber weight of the radius filler and the braided radius filler is braided according a formula. A further object pertains to a method for producing the radius filler and a composite comprising the radius filler.

Abstract: A multiaxial product including at least three thread layers, each of the thread layers being formed by multi-filament reinforcing yarns which are arranged within thread layers so as to be mutually parallel and next to one another so as to be adjacent, at least two thread layers being arranged within multiaxial product wherein thread layers define a 0° direction within multiaxial product and the at least one further thread layer being arranged at an angle of more than±10° with respect to 0° direction within multiaxial product, the at least two thread layers in 0° direction directly following one after the other, based on relative arrangement of the at least three thread layers within multiaxial product, without a further layer of multi-filament reinforcing yarns therebetween. Further, a method for producing multiaxial product, further relating to composite produced from multiaxial product and to a method for producing composite from multiaxial product.

Abstract: Method for producing a textile unidirectional fabric, wherein at least one planar layer of multi-filament reinforcement threads arranged parallel to each other are woven with each other over transverse threads, wherein transverse threads having core-sheath structure and titer of 10 to 40 tex are used as transverse threads, wherein transverse threads have a first component, which structures sheath, and second component, which structures core, wherein first component has lower melting temperature than second component, first component is meltable thermoplastic polymer material and, via first component of transverse threads, adjacently arranged multi-filament reinforcement threads are connected to each other by hot melting, wherein alleys are formed in unidirectional fabric by interweaving multi-filament reinforcement threads together with transverse threads, by means of which a permeability of 10 to 600 l/dm2/min can be established.

Abstract: An object of the present invention is to provide a carbon fiber which exhibits excellent strength development rate when used in a composite material. The present invention that solves the problems is a carbon fiber which simultaneously satisfies the following formulae (1) and (2): Lc/d?3??(1) TS×d×Lc>6.0×105??(2) wherein: Lc is an X-ray crystallite size (?), d is a filament diameter (?m), and TS is a strand tensile strength (MPa).

Abstract: Described is a method for producing a fiber preform by deposition of reinforcing fiber bundles onto a surface including: supplying at least one continuous strand of reinforcing fibers provided with a binder to a deposition head, spreading the at least one strand in a spreader unit and conveying using a first conveying device to a longitudinal splitting device, cutting the at least one strand in the longitudinal splitting device along the longitudinal extension thereof into at least two partial strands by means of a splitting element, conveying the partial strands by means of a second conveying device to a cut-to-length unit, cutting the partial strands by means of the cut-to-length unit into reinforcing fiber bundles, and depositing the reinforcing fiber bundles onto a surface and/or reinforcing fiber bundles deposited on the surface and fixing the reinforcing fiber bundles to form the fiber preform.

Abstract: A deposition device for controlled deposition of reinforcing fiber bundles on a surface, including a deposition head and a controllable positioning unit, means for providing at least one strand of reinforcing fibers provided with a binder, and a first conveying device, arranged on the deposition head conveys the at least one strand to the deposition head, wherein, when viewed in the conveying direction, means for spreading the at least one strand are arranged on the deposition head, and the deposition head has a second conveying device arranged after the first conveying device, a longitudinal splitting device, arranged between the first and second conveying devices, with at least one splitting element for splitting the at least one strand along the longitudinal extension thereof into two or more partial strands, and a cut-to-length unit arranged after the second conveying device for cutting-to-length the two or more partial strands into fiber bundles.