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Patent
Title

Faden-oder Fasergelege, Verfahren zu seiner Herstellung und Faserverstaerkter Koerper

Other Title
Fiber yarn or roving placement method for manufacture of preforms for composite products involves laying down roving sections cut from continuous roving to form layers.
Abstract
Die Erfindung betrifft Faden- oder Fasergelege, einen faserverstaerkten Koerper und ein Verfahren zur Herstellung von Faden- oder Fasergelegen in multidirektionalen Schichten, insbesondere als Halbzeug fuer die Verstaerkung dreidimensionaler, duennwandiger Werkstuecke aus Kunststoff oder Harzen, bei dem Faden- oder Faserstraenge einander kreuzend in Schichten abgelegt werden und anschliessend zueinander fixiert werden. Hierbei bezweckt die Erfindung, die Formstabilitaet und die Einsetzbarkeit derartiger Gelege weiter zu verbesern. Dies wird erreicht, indem zumindest einige der Faden- oder Faserstraenge als einzelne Strangstuecke eines Faden- oder Faserstrangmaterials spannungsfrei abgelegt werden. Bei einem Faden- oder Fasergelege mit einer Vielzahl von Faden- oder Faserstraengen, die, einander kreuzend, in Schichten angeordnet und zumindest stellenweise zueinander fixiert sind, wird dies erreicht, indem zumindest einige der Faden- oder Faserstraenge als einzelne Strangstuecke eines Faden- oder Faserstrangmaterials ausgebildet sind. Schliesslich wird ein faserverstaerkter Koerper, insbesondere Kunststoff- oder Harzkoerper, vorgeschlagen, bei dem das Faden- oder Fasergelege im Wesentlichen vollstaendig von einem Kunststoff- oder Harzmaterial umgeben ist.

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DE 10301646 A UPAB: 20040901 NOVELTY - Fiber yarns or rovings (2) are laid down so that they cross each other in layers (6a,6b) and are then fixed to each other to form a stable roving preform (1). At least some of the rovings are laid down as individual sections (4) cut from a continuous roving length and are tension-free. DETAILED DESCRIPTION - All yarns or fiber rovings (2) of the preform (1) are formed as sections (4) cut from a semi-continuous yarn or fiber roving. Each layer (6a,6b) comprises rows (5a,5b) of individual roving sections adjacent to each other with same orientation, the sections being either parallel to or at a slight angle to each other. The rows are formed across the entire breadth of each layer. Adjacent roving rows may overlap each other. Individual roving sections are laid down at an angle to the longitudinal direction (L) of the roving preform (1). Roving sections of one or more rows of rovings may be placed simultaneously. During placement rovings are converted from a round cross-section to a flat rectangular cross-section (7). The cross-section change may be produced either before, during or after cutting of roving sections or after placing the latter. Following placement the roving sections of a layer are temporarily held in position by pairs of rolls. Roving sections may be sewn, woven or bonded together. Roving sections are laid down on a base material (9) or previous roving layer which is moved in the longitudinal direction of the preform. Roving sections in the uppermost and lowest layers are attached to carrier layers forming either a base material and/or a cover material. INDEPENDENT CLAIMS are included for: (1) a fiber yarn or roving preform produced by the claimed process; and (2) a fiber reinforced product in which the claimed preform is completely impregnated in a plastic or resin matrix. USE - For production of a fiber roving or yarn based preform for subsequent use in production of resin or plastic impregnated composite products, in particular three-dimensional thin walled products. ADVANTAGE - The dry preform, free of fiber tension, is easily formed into three-dimensional shapes and the innermost fibers are more easily impregnated to give high strength products.
Inventor(s)
Schleicher, S.
Link to:
Espacenet
Patent Number
2003-10301646
Publication Date
2004
Language
German
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
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