Saertex Wagener Gmbh & Co. Kg

Mcdonnell Douglas Corporation

Saertex France

Saertex Gmbh & Co Kg

Saertex Wagener Gmbh

Gert Wagener

Arno Erk Pabsch

Christof Sigle

Markus Kleineberg

Jens Kleffmann

Carsten Schoeppinger

Raymond J Palmer

Thierry Klethi

The object of the invention is a process for production of a reinforcement () for composite material comprising at least two layers () intended to be embedded in a polymer matrix, characterized in that at least one () of the layers is comprised of continuous filaments () in one main direction F and in that these filaments are positioned with variable spacing along this main direction F.

Process for production of a reinforcement for composite material with a variable resistance profile, reinforcement obtained

A thread or other element for bonding fibers in a fibrous reinforcement for use in a fiber composite is such that it is at least degraded in the course of the production of said fiber composite.

Fiber-reinforced composites and method for the production thereof

The invention relates to a multiaxial complex of multifilament threads formed of continuous filaments, whereby the multifilament threads are placed on top of one another in different orientations, and the threads of the 0&#xb0; layers run in the production direction, and whereby the multifilament threads of the 0&#xb0; layers are laid in between the other multifilament layers layered in different orientations and, spread apart and without any torsion before their placement, are placed onto the previous multifilament layer.

Multiaxial complex

The invention relates to a method for producing a multiaxial structure out of multifilament threads which are superimposed with different orientations. The threads of the 0&deg; position run in a direction of production and are inserted between the remaining multifilament layers superimposed with different orientations. In addition, the threads of the 0&deg; position are guided in the area located in front of the stitch bonding machine by auxiliary means which ensure the correct superimposition or distribution thereof.

Method for producing a multiaxial structure out of multifilament threads

Process for manufacturing a flat element with interrupted multifilaments

An improved warp/knit stitch reinforced multi-axial non-crimp layered fabric sheet used in structural applications, as for example, in aircraft and water applications, e.g. the skin of an airplane wing or fuselage structure, in water applications, e.g. skins of surfboards and boats, and in other areas where high strength and relatively light weight is required. The fabric is comprised of a plurality of plies facewise disposed upon one another and knitted or stitched to form a structural sheet. Each fabric ply is made of strands of aligned structural fibers which can be later impregnated and even pre-impregnated with a resin curable matrix. The improved sheet is formed by applying unidirectional non-crimp and non-woven plies of different angular relationship to one another, e.g. a +45.degree., a 90.degree. and a -45.degree. ply and locating 0.degree. plies in essentially any position in the ply arrangement such that the 0.degree. ply can be on the bottom of the sheet, on top of the sheet, or interposed between plural ply layers of the sheet. The sheets are then knitted or stitched together to make a stack of multi-axial fabric layers. The fiber weight and thickness can also be varied throughout the sheets by using plies of different thicknesses or differing weights of fibers. Moreover, the percentage of a certain type of fiber in a particular ply can be varied. In addition, damage tolerance can be built into the cured laminate. Further, doublers and local area reinforcements can also be included in the sheet. In addition, a warp/knit, or warp/stitched fabric may be made to a desired width without otherwise affecting the structural properties of the sheet. An apparatus and a method for producing the fabric sheets is also disclosed.

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Gert Wagener