Patent ID: 6322350
Filing Date: 2001-11-27
Classification: B29C,Y10S

Abstract:
A mould for manufacturing discs, which mould comprises:at least two mould parts which are mutually movable between a closed position in which they bound a mould cavity, which mould cavity has walls, a middle zone and a peripheral zone and which mould cavity is connected to an injection conduit for admitting heated, plasticized plastic under pressure into said mould cavity, and an opened position in which a disc can be removed;removing means for removing a central portion from the disc to form a central hole present therein, which removing means comprise a cylindrical part which is movable in an axial direction in the closed situation of the mould cavity,wherein at least one of the two mould parts is provided with middle zone tempering means which surround the injection conduit and are active in the middle zone of the mould cavity for tempering the inflowing plastic during the inflow thereof via a pressure line and thus during the filling of the mould cavity, andan additional mould part arranged around the mould part through which said injection conduit extends, which additional mould part is provided with a wall region tempering means which completely surround said middle zone tempering means in the region adjacent to the mould cavity and which are active only in the region of the wall of the mould cavity around the injection conduit for tempering the plastic flowing into the mould cavity during the filling of the mould cavity.