Hybrid yarn for composite materials with thermoplastic matrix and method for obtaining same
AssigneeSA Schappe
InventorsJean Guevel, Marc Francois, Guy Bontemps
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Abstract
A hybrid yarn is made up of an intimate mixture of spun yarns of reinforcing fibers and spun yarns of thermoplastic matrix fibers. The spun yarns are obtained by cracking with slow, gradual stretching of the multifilaments. After stretching, parallel fibers are wrapped with a continuous thermoplastic filament. The invention may be used to produce hot-stamped parts.
Claims7
A hybrid yarn for composite materials with a thermoplastic matrix, comprising an intimate mixture, of spun yarns of reinforcing fibers and spun yarns of thermoplastic matrix fibers, each of the spun yarns of fibers having been obtained by cracking with slow, gradual stretching of multifilaments, and, after stretching, parallel fibers of said mixture, having been wrapped by a continuous filament of thermoplastic material.
A method for obtaining a hybrid yarn for composite materials with a thermoplastic matrix, comprising subjecting multifilaments of reinforcing fibers and multifilaments of matrix fibers to separate processes of cracking by slow, gradual stretching, assembling the resulting strips of discontinuous fibers thus obtained on a stretching machine of the intersecting type, a stretched strip leaving this stretching machine being assembled on another stretching machine with identical strips, this operation being repeated several times in order to obtain a highly intimate mixture, subjecting the strip obtained to stretching in a laminating system, and finally passing the resulting bundle of parallel, mixed, discontinuous fibers through a hollow spindle bearing a continuous filament of thermoplastic material to wrap the bundle of fibers with said continuous filament.
Dependencies are inferred from the claim text.