A method of making a composite laminate and a pwb substrate...

H - Electricity – 05 – K

Patent

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Details

H05K 1/03 (2006.01) B29B 15/12 (2006.01) B29C 70/50 (2006.01) B32B 5/26 (2006.01) H05K 3/02 (2006.01)

Patent

CA 2181997

The invention relates to a method of making a composite laminate comprising the steps of providing unidirectionally oriented parallel fibres (UD filaments) (3) with a resin matrix to form a composite UD layer and laminating a plurality of UD layers to form a UD crossply laminate (18). In the method of the invention, the UD filaments are impregnated with a melt of a resin which in the uncured form solidifies below a certain temperature (Tm). Thereupon the UD filaments-containing resin is cooled to a temperature below Tm to produce said composite UD layer. The produced composite UD layer is irreversibly cured before or after lamination. Notably latent curing resins are suitable. The impregnation is preferably conducted by coating a process belt (8) with solid resin (6), laying the UD filaments onto the resin, and heating the resin so as to form the resin melt. The heating of the resin is preferably conducted by means of IR irradiation (11).

L'invention se rapporte à un procédé de fabrication d'un stratifié composite consistant à obtenir des fibres parallèles orientées unidirectionnellement (filaments UD) (3) avec une matrice de résine afin de former une couche UD composite et à stratifier une pluralité de couches UD afin de former un stratifié à couches transversales UD (18). Selon le procédé de l'invention, on imprègne les filaments UD d'un mélange de résine qui, sous la forme non durcie, se solidifie au-dessous d'une certaine température (Tm). Puis, on refroidit la résine contenant des filaments UD à une température inférieure à la température Tm afin d'obtenir cette couche UD composite. La couche UD composite obtenue est durcie de manière irréversible avant ou après le processus de stratification. Notamment, des résines à durcissement latent sont appropriées. On effectue de préférence l'imprégnation en appliquant une courroie de traitement (8) comportant une résine solide (6), en posant les filaments UD sur la résine et en chauffant la résine de façon à obtenir son ramollissement. On chauffe de préférence la résine au moyen d'un rayonnement infrarouge (11).

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