The invention relates to a supply apparatus (100) for supplying at least one molding device (500) with a polymerizable mixture, comprising: a tank (110) where is stored the polymerizable mixture, a line (120) for supplying the at least one molding device with said polymerizable mixture, the line being connected to an outlet of the tank for receiving the polymerizable mixture and to an inlet of said at least one molding device, and means for making the polymerizable mixture circulate in said line. According to the invention, the line includes remove means (190) for removing the gas from said polymerizable mixture and for evacuating said gas out of said supply apparatus.