| 摘要 |
An injection moulding unit comprises at least two injection moulds for manufacturing disc-like objects, which injection moulds each comprise two mould parts which are mutually displaceable between a closed position, in which they bound a mould cavity (20), which mould cavity is connected to a pressure line (19) for carrying heated plastic into this mould cavity, and an opened position in which a disc-like object can be removed; and punching means (11) for punching a central hole from a disc-like object, which punching means (11) comprise a cylindrical part forming part of the one mould part and having a leading peripheral edge, which part is axially movable from and to the other mould part; wherein the respective pressure lines (19) of the moulds are branches of a feed line (18) and together therewith form part of a collective multiple hot runner (1), wherein the inlet zone of the feed line (18) is adapted for coupling to the outfeed of a plastic-plasticizing and pressing device; wherein the outlet zone of each feed line is adapted for coupling to the infeed of an injection bush (2), the outfeed of which debouches directly into the mould cavity; wherein the hot runner (1) is coupled by means of spring means (27) to a connecting piece (3) of thermally conductive material, which connecting piece (3) is fixedly connected to the injection bushes (2); and wherein tempering means are present for holding the temperature of the connecting piece (3) within predetermined limits. <IMAGE> |
