摘要:
La présente invention concerne un procédé de préparation d'un ruban (I) de fils (1) ou filaments de renfort associé sur chacune de ses faces à un liant polymérique, ledit ruban présentant une largeur donnée sensiblement constante sur toute sa longueur, dans lequel les fils ou filaments s'étendent selon une direction parallèle à la longueur du ruban caractérisé en ce qu'il comprend les étapes suivantes : a) association du ruban sur chacune de ses faces au liant polymérique qui est une poudre (3) d'un ou plusieurs polymères thermoplastiques et/ou thermodurcissables, permettant d'assurer une cohésion homogène du ruban, de manière à ce que la masse totale de liant représente moins de 15 % de la masse totale du ruban obtenu, b) après l'étape a), ajustement de la largeur du ruban à la largeur souhaitée grâce à des moyens de calibrage. La présente invention concerne également un ruban de fils ou filaments de renfort associé sur chacune de ses faces à un liant polymérique, dans lequel les fils ou filaments s'étendent selon une direction parallèle à la longueur du ruban, la masse de liant polymérique représentant moins de 15 % de la masse totale du ruban, la largeur du ruban étant de 3 à 600 mm, caractérisé en ce que ledit ruban présente une largeur donnée sensiblement constante sur toute sa longueur, la largeur du ruban présentant, sur toute la longueur du ruban, un écart type inférieur à 0,25 mm.
摘要:
The invention relates to a fabric comprising carbon threads, said fabric having a mass per unit area in the range from 40 g/m2 to 100 g/m2, preferably in the range from 40 g/m2 to 80 g/m2, particularly in the range from 60 g/m2 to 80 g/m2, and characterised in that it comprises discontinuous fibres, said discontinuous fibres extending from threads constituting the fabric from which they come and extending non-parallel to the direction of the thread from which they come and/or in that the fabric is needled. The invention also relates to the use of said fabric in a diffusion layer for a fuel cell and a method for producing said diffusion layer.
摘要:
The invention concerns a method for spreading a textile sheet (2) comprising at least warp yarns, wherein: the sheet (2) is made to pass between at least two rotary rollers (5), (6), of which the axes (A) extend parallel to one another and substantially perpendicular to the direction of travel of the sheet; the sheet is made to pass under pressure between at least one pressure generator (Si) of the rollers which are driven so as to oscillate axially and in phase opposition. According to the invention, at least one pressure generator of the rollers (5), (6) is produced with adjustable pressure values along the generator (G1) in order to spread the sheet (2) with a low degree of thickness variability. The invention also concerns a machine suitable for performing this method.
摘要:
Head for application of reinforcing filaments (2) on a deposition surface (3), this head comprising: a mechanism (8) for cutting the reinforcing threads (2) upstream of an application zone (5), comprising at least one cutting member (10) and a driving member (11) for moving the cutting member (10) on the one hand along a forward travel (f1), to allow the reinforcing threads (2) to be cut, and on the other hand a return travel (f2) in the opposite direction to the forward travel, to allow the cutting member (10) to be disengaged from the reinforcing threads (2); and a system (16) for re-routing the reinforcing threads (2) after they have been cut, at least as far as the application zone (5). The cutting mechanism (8) provides the motor drive for the re-routing system (16), having suitable means for, on the one hand, not entraining the reinforcing threads (2) during the forward travel (f1) of the cutting member (10) and, on the other hand, entraining the reinforcing threads (2) at least as far as the application zone (5) during the return travel (f2).
摘要:
The present invention relates to a method for continuously applying to an application surface an intermediate material consisting of a unidirectional layer of reinforcing fibres which is associated on at least one of its sides with a layer of thermoplastic and/or thermosetting material which represents no more than 10% of the total weight of the intermediate material, in which method: the intermediate material has, prior to being applied, undergone an operation involving the point-wise application of through-loads accompanied by heating causing a penetration of the thermoplastic and/or thermosetting material and creating connecting bridges within the thickness of the unidirectional layer of reinforcing fibres, the intermediate material is applied continuously with the simultaneous application of tension and pressure so as to apply to the application surface a side of the intermediate material that is in the process of being applied that corresponds to a layer of thermoplastic and/or thermosetting material and activating said layer of thermoplastic and/or thermosetting material during the application thereof so as to create a bond between the applied intermediate material and the application surface; to a method of forming a stack for creating composite components that implement said method and to various uses thereof.
摘要:
The invention relates to an intermediate product intended for the production of a composite part in combination with a resin matrix, formed by at least two unidirectional sets of reinforcing yarns, the yarns of each set extending in a different direction, whereby the sets are interlinked by means of stitching or knitting using at least one stitching or knitting yarn. The invention is characterised in that the stitching or knitting yarn has a yarn count of less than or equal to 30 dTex, preferably less than or equal to 25 dTex, in accordance with standard EN ISO 2060.
摘要翻译:本发明涉及一种中间产品,用于生产与由至少两个单向的增强纱线组成的树脂基质组合的复合部件,每组纱线沿不同的方向延伸,由此,各组纱线在不同方向上相互连接, 使用至少一个缝合或针织纱线的缝合或针织装置。 本发明的特征在于,根据标准EN ISO 2060,缝合或编织纱线的纱线数量小于或等于30dTex,优选小于或等于25dTex。