High-productivity single-stage method and apparatus for producing containers made of thermoplastic material
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United States of America Patent
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Jun 25, 2002
Grant Date -
N/A
app pub date -
Aug 20, 1999
filing date -
Jul 3, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system for providing for the production of preforms of thermoplastic resin by filling a plurality of multiple-cavity molds with molten resin for forming the preforms, holding and cooling down the molten resin inside the molds, removing the molded preforms from the molds, subjecting the preforms to a subsequent temperature conditioning stage, and transferring the preforms to a blow-molding stage. Each of the multi-cavity molds includes a plurality of cavities defined in several distinct clusters and each cavities belonging to the same cluster is cooled in a distinct and differentiated manner with respect to the cavities belonging to other clusters provided in the same mold.
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