| 摘要 |
Method for producing, by injection, components made of composite materials containing reinforcing fibres in a matrix made of synthetic resin lightened by incorporation of gas. The low-pressure mixing of the gas and the resin is carried out in a mixing column 1 in which the resin flows over successive plates 2. Between each plate, a gas is injected via nozzles 3. As the resin flows it becomes loaded with gas in order to form a lightened resin 4 of density less than 700 g/litre. The reactants necessary for crosslinking the resin are incorporated, either in the base resin or by means of metering pumps 5. The lightened resin is then injected by means of a pump 6 over the reinforcing fibres 8 between the walls of a mould 7. Vents enable the air to escape. Having filled the mould, the injection orifice is blocked off. <IMAGE>
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