Extrusion head for blow-molding apparatus

Details Extrusion head for blow-molding apparatus Extrusion head for blow-molding apparatus

1998-06-11

2000-02-15

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Including means to prepare parison

264541, 425381, 425465, 425466, B29C 4722, B29C 4904

Patent

active

060245573

ABSTRACT:
An extrusion head for a blow-molding apparatus has an annular and relatively rigid outer housing centered on a housing axis, a rigid ring axially fixed in the housing and shiftable radially of the housing axis in the housing, and a sleeve generally coaxially received in the housing and having an upstream end secured to the ring and a downstream end radially elastically deflectable transversely of the housing axis relative to the upstream end. A rigid core coaxially received within the sleeve in the housing has an outer surface defining an annular passage with an inner surface of the sleeve. A passage-adjuster includes at least one main actuator braced between the ring and the sleeve downstream end for deforming the sleeve downstream end radially of the housing axis relative to the ring and at least one secondary actuator braced between the ring and the housing for shifting the ring and sleeve radially of the housing axis relative to the housing so that radial dimensions of angularly offset portions of the passage can be locally controlled by combined action of the actuators.

REFERENCES:
patent: 4124351 (1978-11-01), Garbuio
patent: 4382766 (1983-05-01), Feuerherm
patent: 5057267 (1991-10-01), Seizert et al.
patent: 5108682 (1992-04-01), Tompkins et al.
patent: 5785920 (1998-07-01), Ogawa et al.
"Beeinflussing Der Wanddicke Bei Der Hohlkorperfertigung", Volker Voelz, Plastverarbeiter 32, Jahrgang 1981, No. 3.

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