Improvements in or relating to moulding methods and moulded...

B - Operations – Transporting – 29 – C

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B29C 70/44 (2006.01) B29C 70/08 (2006.01) B29C 70/34 (2006.01) B32B 5/28 (2006.01)

Patent

CA 2282387

A method of moulding a composite material which includes a fibre reinforcement within a resin comprises laying alternately on a mould first and second layers of fibre material pre-impregnated with uncured resin, where the resin content of the first layer is different from that of the second layer and the combination of layers gives the desired overall total volume fraction of fibres and resin in the laminate, enclosing the layers within an impervious membrane, evacuating the membrane and applying heat to the layers to flow gellate and at least partially cure the resin and during the process to allow released gasses and vapours to flow along the layers of lower resin content towards the membrane for subsequent evaluation.

L'invention concerne un procédé de moulage d'une matière composite qui comporte un renforcement de fibres à l'intérieur d'une résine. Le procédé consiste à étaler alternativement sur un moule une première et une seconde couches de matière fibreuse pré-imprégnée d'une résine non polymérisée. La teneur en résine de la première couche est distincte de celle de la seconde couche. La combinaison des couches donne la valeur souhaitée de la fraction de volume des fibres et de la résine dans le stratifié. Le procédé consiste également à entourer les couches dans une membrane imperméable, à évacuer la membrane et à administrer de la chaleur aux couches dans le but de faire couler, gélifier et de polymériser au moins partiellement la résine; et, au cours de ce processus, à permettre aux gaz et aux vapeurs émis de s'écouler le long des couches à teneur en résine inférieure en direction de la membrane en vue d'une évacuation ultérieure.

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