Injection molding of preform comprising filling and casing, first injects casing and filling into separate cavities, later joining cavities and displacing filling into casing

摘要

First the casing (7') and the filling (8a', 8b', 8c') are injected separately, into separate mold cavities (7, 8a-8c). When the casing and filling have largely hardened, the cavities are connected. The filling is forced into the casing. To join the cavities in the mold halves (1, 2) one or more slides (3) with passage(s) are displaced. The filling is pushed through the passage, using a push rod (5). Before injecting the casing, a core rod (4) is inserted. This is retracted once the casing has largely hardened, but before forcing the filling in. The filling comprises differing materials injected into a number of separate mold cavities. Multiple slides and passages are employed in a similar arrangement. An Independent claim is included for the corresponding mold.