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US 4,725,464 AGranted
Refillable polyester beverage bottle and preform for forming same
AssigneeContinental PET Technologies, Inc.
InventorWayne N. Collette
Life of this patent
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AssigneeContinental PET Technologies, Inc.
InventorWayne N. Collette
Estimating the term…
A returnable/refillable container in the form of a blow molded polyester biaxially oriented bottle having a physical and structural relationship providing for the maintenance of aesthetic and functional viability over a minimum of twenty trips wherein each trip comprises (1) an empty state caustic wash followed by (2) contaminant inspection and product filling/capping, (3) warehouse storage, (4) distribution to wholesale and retail locations, and (5) purchase, use and empty storage by the consumer followed by return to a bottler. The container is obtained utilizing a specific preform configuration and reheat blow process wherein the sidewall of the resultant container has a percent crystallinity of 28-30 at a total preform draw ratio of 7-9/l. The container is formed utilizing recently developed process techniques to optimize strain induced sidewall crystallization.
A preform for use in blow molding a container suitable for refilling, said preform being an injection molded member formed of a polyester, said preform having an elongated body for forming a container body and being closed at one end and open at the opposite end, said preform open end having a threaded neck finish with said preform between said threaded neck finish and said elongated body having a portion tapering in wall thickness for forming a container shoulder portion, said closed one end being defined by a bottom having a generally hemispherical outer surface, and between said closed one end and said preform body there being a cylindrical container base forming thickened portion of an increased wall thickness as compared to the wall thickness of said preform body.
Dependencies are inferred from the claim text.