Method and apparatus for blow molding

Details Method and apparatus for blow molding Method and apparatus for blow molding

B - Operations, Transporting

29

D

18/529

B29D 23/03 (1980.01)

Patent

CA 1132318

METHOD AND APPARATUS FOR BLOW MOLDING ABSTRACT OF THE DISCLOSURE A method and apparatus utilizing preform andfinal blow molds for forming molecularly oriented thermoplastic articles. According to the method, an extruded tubular praison is position 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 temperture of the pre-form is adjusted to within the range for molecular orientation. Next, the tthermally conditioned pre-form is conveyed by the move- able carrier to a final blowning sation where the pre-form is blown to the configura- tion of the final article. In a first disclosed embodiment, the carrier is a blow pin which is inserted into the tubular parison at the pre-form molding station prior to the first molding opertion. In the second embodiment, the carrier is a tubular pre-form into the thermal conditioning chamber, and the pre-form is blown to its final shape by a blown tube inserted through the carrier. In both embodiments, the carrier are used to convey succesive pre-form in a continuous molding operation.

383493

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