Vacuum molding process and corresponding molding installation

Prior to mixing the resins and the mould are placed in a moulding chamber with a transparent side wall, which is swept with the dry gas, the moulding chamber is evacuated, and the resins are mixed and introduced into the mould while the mould is vibrated. The mould and resins are stored prior to use at a temperature of about 17 - 25 degrees C in a separate unit with a neutral gas. The procedure, in which two or more resins are mixed and poured into a mould (40), includes a stage prior to mixing in which the resins and mould are dehumidified by contact with a dry gas such as nitrogen to give a humidity level of less than 40 %, and preferably less than 15 per cent. Prior to mixing the resins and the mould are placed in a moulding chamber (1) with a transparent side wall (4), which is swept with the dry gas, the moulding chamber is evacuated, and the resins are mixed and introduced into the mould while the mould is vibrated. The mould and resins are stored prior to use at a temperature of about 17 - 25 degrees C in a separate unit with a neutral gas, and the chamber has a supporting panel (8) for the mould and a system (36, 37, 38, 39) for introducing one or more resins. L'invention concerne un procédé de moulage comprenant les étapes de : mélanger au moins deux résines, introduire le mélange dans un moule (40), le procédé comprenant l'étape préalable au mélange de déshumidifier les résines (58) et le moule (40). L'invention a également pour objet une installation de moulage correspondante.