Toho Tenax Europe Gmbh

Airbus Operations Gmbh

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Toho Tenax Co., Ltd.

Teijin Carbon Europe Gmbh

Bernd Wohlmann

Pierre C Zahlen

Carsten Barlag

Peter Elsner

Joachim Piepenbrock

Hans-Peter Fink

Markus Schneider

Rudolf Emmerich

Mathias Kaiser

Gunnar Engelmann

Silke Stusgen

Silke Stüsgen

Sabine Kummer-Dörner

Lukas Alberts

Klaus Peter Schwung

Matthias Schubert

Silke Stuesgen

Frank Oberwahrenbrock

Andreas Woginger

Jens Pusch

Silke Witzel

Ralf Dreher

Christian Hunyar

Michael Wölki

Andreas WÖGINGER

Sabine Kummer-Dorner

Frank Henning

Andreas Ebert

Klaus-Dieter Nauenburg

Matthias Graf

A pre-impregnated yarn including a bundle of reinforcing fiber filaments having a bundle interior and a bundle outer side, a first resin composition, and a second resin composition. The first resin composition includes at least one urethane resin, H1, produced from a reaction of a bifunctional aromatic epoxy compound based on bisphenol A, an aromatic polyisocyanate, and a polyalkylene glycol; an oxyalkylated bisphenol A resin, H2; and aromatic polyhydroxy ether P1. The filaments are impregnated with and at least partially connected via the first resin composition. The first resin composition is present in a concentration of 0.1 to 4 wt % relative to a total weight of the pre-impregnated yarn. The second resin composition is on the bundle outer side in the form of particles or drops adhering to the filaments, and is in a concentration of 0.5 to 14 wt % relative to the total weight of the pre-impregnated yarn.

Impregnated reinforcing fiber yarn and its use in producing composite materials

A fiber preform for producing fiber composite structures, a wall thereof including a first zone made from reinforcing fiber bundles having a first resin composition and a second zone made from at least one fiber tape comprising at least one unidirectionally directed reinforcing yarn strand having a second resin composition. The reinforcing fiber bundles in the first zone are oriented in different spatial directions to each other when viewed in a direction parallel to the extension of the thickness. Each reinforcing fiber has a length of from 3 to 50 mm, and contains the first resin composition in a concentration of from 1 to 10 wt % of the fiber weight. The wall of the fiber preform has a proportion of reinforcing fibers of more than 35 vol %, and the second zone forms a discrete region when viewed in a direction perpendicular to the thickness extension of the wall.

Fiber preform made from reinforcing fiber bundles and comprising unidirectional fiber tapes, and composite component

Carbon fibers and carbon fiber yarn consisting of carbon fibers, the fibers having been pretreated by electrochemical oxidation, characterized in that they have a finish consisting of epoxy resin(s), a vinyl component, and a plasticizer in an amount of 0.3 to 5 wt. % relative to the carbon fibers, which are to be provided with the finish.

Carbon fiber

A process for producing fiber preforms for composite material components makes it possible to directly produce complex geometries in a flexible and low-cost manner by applying a plurality of dry fiber rovings independently of one another even in spatially uneven contours. It is no longer necessary to use cut fabric strips since fiber preforms are produced straight from the dry fiber rovings. This obviates the need to carry out production, transport and order picking processes. It is not necessary to cut fiber strips to size, and therefore a saving may be made on material. In addition, it is possible to increase the mechanical characteristic values in the composite material because it is not necessary to sew fiber webs. The described process can also readily be scaled since the number of dry fiber rovings arranged next to one another make it possible to vary the area which can be covered.

Process for producing fibre preforms

A yarn includes reinforcing fiber filaments and a resin that is infiltrated into the yarn and can be repeatedly melted and solidified by cooling to room temperature, wherein the filaments of the yarn are at least partially bound to one another by the resin, wherein the yarn contains 2.5 to 25 wt.% of infiltrated resin relative to its total weight, and wherein the infiltrated resin includes a mixture of at least two epoxy resins Eand E, Ehaving an epoxy value in the range of 2,000 to 2,300 mmol/kg of resin and Ehaving an epoxy value in the range of 500 to 650 mmol/kg of resin, and the weight ratio E:Eof the epoxy resins Eand Ein the mixture is chosen so that the infiltrated resin mixture has an epoxy value between 550 and 2,100 mmol/kg of resin. A preform comprising the yarn, a method for producing the preform and its use in producing a composite are also described.

Epoxy resin impregnated yarn and the use thereof for producing a preform

A composite material is described that contains a reinforcing resin and reinforcing fibers, wherein the reinforcing fibers have a coating containing polyphenylene sulfide and the proportion of polyphenylene sulfide relative to the uncoated fibers is 0.001 to &#x3c;0.01 wt. %. The composite material shows higher apparent interlaminar shear strength and bending strength as compared with similar composite materials having no PPS coating in the above concentration range.

Composite material, method for the production and use thereof

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Dusseldorf, Germany

Bernd Wohlmann