Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1998-03-31
1999-11-30
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
1641553, 164457, 2643281, 36447508, 425145, 425149, B29C 4577
Patent
active
059937041
ABSTRACT:
For exactly determining the switchover point when producing plastic injection mouldings, two pressure sensors are arranged successively at intervals in the flow direction of the inflowing material, so that the material reaches them at different points in time, and pressure curves (p.sub.1, p.sub.2) are recorded inside the mould cavity. From the measured pressures, the differential pressure is derived. When passing from volumetric filing to compression, the pressures in the mould cavity (p.sub.1, p.sub.2) undergo an abrupt rise (U1, U2). This is reflected in a steep drop of the differential pressure formed, its gradient experiencing a change of sign (V). This indicates that the switchover point has been reached, at which the filling phase must give way to the holding pressure phase.
REFERENCES:
patent: 3982440 (1976-09-01), Groleau et al.
patent: 5174933 (1992-12-01), Toh et al.
patent: 5356575 (1994-10-01), Krosse et al.
patent: 5514311 (1996-05-01), Shimizu et al.
patent: 5665283 (1997-09-01), Bader et al.
patent: 5733486 (1998-03-01), Hayase et al.
Heitbrink Jill L.
K.K. Holding AG
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