B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/529
B29D 23/03 (1980.01)
Patent
CA 1132317
METHOD AND APPARATUS FOR BLOW MOLDING ABSTRACT OF THE DISCLOSURE A method and apparatus utilizing preform and final blow molds for forming molecularly oriented thermoplastic articles. According to the method, an extruded tubular parison is positioned within the pre-form blow mold and blown to a pre-form configuration. The blown pre-form is then conveyed, while suspended from a moveable carrier, through a thermal conditioning chamber and the temperature of the pre-form is adjusted to within the range for molecular orientation. Next, the thermally conditioned pre-form is conveyer by the move- able carrier to a final blowing station where the pre-form is blown to the configura- tion of the final article. In a first disclosed embodiment, the carrier is a tubular which is inserted into the tubular parison at the pre-form molding station prior to the first molding operation. In the second embodiment, the carrier is a tubular projection telescopically inserted into the blown pre-form prior to the entry of the pre-form into the thermal conditioning chamber, and the pre-form is blown to its final shape by a blow tube inserted through the carrier. In both embodiments, the carriers are used to convey successive pre-forms in a continuous molding operation.
383492
Krall Thomas J.
Uhlig Albert R.
Gowling Lafleur Henderson Llp
Owens-Illinois Inc.
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