Mould for manufacturing disc-like objects
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United States of America Patent
Stats
-
Nov 27, 2001
Grant Date -
N/A
app pub date -
Mar 10, 1998
filing date -
Mar 12, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mould for manufacturing disc-like objects including 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. The mould also has a device for removing a central portion from a disc-like object to form a central hole present therein, which device comprises 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 tempered only in the middle zone of the mould cavity for tempering the inflowing plastic during the inflow thereof via the pressure line and thus during the filling of the mould cavity.
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