Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1996-05-16
1999-10-12
Ortiz, Angela
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264537, 264255, B29C 4514, B29C 4516, B29C 4922
Patent
active
059650818
ABSTRACT:
A method of injection molding a multi-layer preform from a combination of virgin and recycled plastic such as PET so that the resultant blow molded bottle has a reduced tendency for bottom failure in spite of the use of the recycled plastic. A mold cavity for injection molding the preform is provided and includes an injection gate located along a sidewall of the cavity rather than at a conventional location in the closed end of the cavity which forms the bottom of the preform. The plastic material is injected through the gate in the sidewall which avoids the presence of crystalline "slugs" in the bottom region of the preform. This creates a preform and resultant blow molded bottle with a much more durable bottom which is not subject to various types of cracking.
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Balduff Dennis C.
Schloss Francis M.
Ortiz Angela
The Coca-Cola Company
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