| 摘要 |
A mould for manufacturing disc-like objects comprises: at least two mould parts which are mutually movable between a closed position in which they bound a mould cavity, 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-like object can be removed; and removing means for removing a central portion from a disc-like object to form a central hole present therein, which removing means comprise a cylindrical part which is movable in axial direction in the closed situation of the mould cavity. The mould has the feature that at least one of the two mould parts is provided with first tempering means which are active substantially only in the middle zone of the mould cavity for tempering the inflowing plastic during the inflow thereof via the pressure line and thus the filling of the mould cavity. <IMAGE> |
