Dual parison extrusion head for multi-layer blow molding

Details Dual parison extrusion head for multi-layer blow molding Dual parison extrusion head for multi-layer blow molding

1989-05-01

1990-07-10

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

425466, 425532, B29C 4726

Patent

active

049404032

ABSTRACT:
Dual parison extrusion head for multi-layer extrusion blow molding in which a die body surrounds two parallel spaced mandrels to form two cylindrical passages from which parisons are extruded. A series of resin supply conduits are provided for directing each resin to both passages. The series of conduits are axially spaced in the extrusion head to direct a plurality of plastic resins to each of the passages to form a multi-layer parison. The resin supply conduits are symmetrical about a vertical plane transversely bisecting the extrusion head between the two passages to produce flow and thermal symmetry in the resin to balance the resin flow to both passages. The resin supply conduits are configured so as to produce the dual parisons with the resin weld line of the multiple resin layers being located on the blow mold parting line. The resin conduits are positioned to minimize the center distance between parisons to reduce the size of the extrusion head. This is accomplished in part by feeding the resin downwardly before the resin flows into the cylindrical passages to form the parisons.

REFERENCES:
patent: 2854691 (1958-10-01), Strong
patent: 2980955 (1961-04-01), Sanko
patent: 3044112 (1962-07-01), Perry
patent: 3048890 (1962-08-01), Soubier
patent: 3564653 (1971-02-01), Sparks et al.
patent: 4047868 (1977-09-01), Kudo et al.
patent: 4179251 (1979-12-01), Hess et al.
patent: 4657497 (1987-04-01), Dehennau et al.

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