Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Reexamination Certificate
2007-02-13
2007-02-13
Heitbrink, Tim (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
C264S328150
Reexamination Certificate
active
10814000
ABSTRACT:
A nozzle for injection molding is made of at thermally conductive metal material but is thermally conductively blocked or interrupted. An abrupt reduction in wall thickness and/or a gap in the continuity of thermally conductive material occur along the nozzle material passageway. This provides a localized restriction to thermal conduction, causing a reduction in heat flow from the mold to the material supply while cooling the melt material near the end of the nozzle. This material, which is relatively cooled to near the mold temperature, becomes the last injected material when filling of the mold is completed, occupying the area of the sprue. As a result, the sprue is relatively cool, thus reducing stringing and shortening mold cycle time.
REFERENCES:
patent: 4981431 (1991-01-01), Schmidt
patent: 5299928 (1994-04-01), Gellert
patent: 5569475 (1996-10-01), Adas et al.
patent: 5879727 (1999-03-01), Puri
patent: 5885628 (1999-03-01), Swenson et al.
patent: 7025585 (2006-04-01), Gellert
Baresich Frank J.
Thompson Robert F.
Duane Morris LLP
Heitbrink Tim
Thermal Wave Molding Corp.
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