Dual-chamber container, and method and apparatus for its manufacture
AssigneeOwens-Brockway Plastic Products Inc.
InventorsRichard R. Johnston, Michael Hsieh
Life of this patent
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Abstract
A method of fabricating a dual-chamber plastic container in an injection/extrusion/blow-molding operation, in which a container finish is first injection molded. The finish mold tooling is then moved axially upwardly as plastic continues to be extruded through extrusion tooling in which an orifice bushing surrounds a mandrel tip. The mandrel tip has a passage through which plastic is extruded to form a wall that divides the extruded tube into separate chambers. Blow molds are brought in from both sides to capture the extruded tube, and air is blown through a passage in the finish mold tooling to blow the tube chambers to the confines of the mold.
Claims12
A method of making a dual-chamber plastic container that comprises the steps of:
- (a) injection molding a container finish that includes a pair of spaced outlet openings,
- (b) extruding from said finish a hollow tubular body having a peripheral wall extending from a periphery of said finish, and an integrally extruded wall extending from between said openings and dividing said body into separate chambers,
- (c) capturing said tubular body between mold segments,
- (d) blowing said peripheral wall within said mold segments by application of air simultaneously and at equal pressures to said chambers through said openings, and
- (e) removing the container from said mold segments.
A method of making a dual-chamber plastic container that comprises the steps of:
- (a) extruding a tubular plastic body having a peripheral wall and an integrally extruded wall dividing said body into separate chambers,
- (b) capturing said tubular body between mold segments,
- (c) blowing said peripheral wall within said mold segments by application of air simultaneously and at equal pressures to said chambers, and,
- (d) removing the container from said mold segments.
Dependencies are inferred from the claim text.