C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/75.3
C03B 9/20 (2006.01) C03B 9/16 (2006.01) C03B 9/34 (2006.01)
Patent
CA 1112874
METHOD AND APPARATUS FOR FORMING GLASS CONTAINERS ABSTRACT OF THE DISCLOSURE Method and apparatus for forming glass containers by the blow and blow process in which a parison mold and blow mold are positioned relative to each other, such that parisons can be transferred by an invert arm. The parisons are formed with their necks down in the parison mold from a charge of glass delivered thereto. Vacuum is applied to the neck mold to settle the molten glass in the neck mold about a special neck pin to thereby form the finish portion of the container. The neck pin is pulled and air under pressure is fed to the interior of the area from which the neck pin is drawn to expand the glass with- in the parison mold at a continuous rate until the glass comes in contact with the mold walls and a baffle which closes the upper end of the parison mold. The parison mold is then opened and the parison is transferred from the parison mold to the blow mold where it is expanded into final shape. The parison mold advantageously is coated with what is termed a "solid film lubricant" which provides a surface that has an insulating effect and requires less "swabbing" over its useable life. The details of the neck mold and plunger provide a mechanism that utilizes a plunger that has a tip that produces less heat removal for the time it is in contact with the charge or gob of glass. The neck or finish portion has been formed by lighter forces, less than atmospheric pressure, and when the plunger is withdrawn, the start of counterblow of the parison may be accomplished much earlier in the forming cycle, since the plunger has not removed as much heat and the corkage reheat time is therefore much shorter.
312513
Fortner John M.
Kirkman Richard T.
Gowling Lafleur Henderson Llp
Owens-Illinois Inc.
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