Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Reexamination Certificate
2005-02-08
2005-02-08
Utech, Benjamin L. (Department: 1722)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
C425S547000, C425S567000, C425S570000
Reexamination Certificate
active
06852264
ABSTRACT:
An improved injection molding runnerless manifold and nozzle system, method and apparatus in which the fluid plastic molding material transfer conduits, such as the manifold runner channels and cavity injection nozzle passageway, are constructed of a low thermal conductivity, non-metallic heat insulation structural material to thereby heat insulate the liquified molding material or resin, whether thermosetting or thermoplastic, while resident in the manifold runners and/or nozzle passageways. The heat transfer and other physical parameters of the conduit material and structure are such that this molding material remains at a reasonable uncured molding temperature while resident in the transfer conduit for the duration of at least one injection cycle due to the heat insulation characteristics of these fluid flow conduits of the system. Preferably the heat insulation material of which the flow conduits are constructed is a polymer material having mechanical properties adequate to permit continuous accessible usage in the foregoing method as part of a separable and clampable manifold and/or nozzle system within the mold tooling as operable in the injection molding environment.
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Luk Emmanuel S.
Reising Ethington Barnes Kisselle P.C.
Utech Benjamin L.
Waugaman William J.
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