Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Differential temperature conditioning
Reexamination Certificate
2005-02-23
2009-06-23
Davis, Robert B (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Differential temperature conditioning
C425S526000
Reexamination Certificate
active
07550105
ABSTRACT:
A method and apparatus are provided for strengthening a portion of a blow molded bottle. The method includes directing a jet of cooled air at a preform before it is molded, causing the wall thickness in the cooled area to remain thicker after molding to strengthen that area of the blow molded article. The apparatus includes a blow molding machine that is provided with a nozzle positioned to direct the cooled jet of air towards the preform. The nozzle is mounted in a standby station that is in between the existing heating station and blow molding station. In one embodiment, the cooled jet of air is directed at a location just below the neck of the preform to create a ring of increased thickness in the shoulder of the blow molded bottle, adding strength to the shoulder of the bottle. A conventional blow molding machine may be modified to rotate and cool the preform in the standby station.
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Access Business Group International LLC
Davis Robert B
Warner & Norcross & Judd LLP
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