Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1991-08-19
1993-01-19
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
29611, 219544, 219548, 425549, B29C 4572
Patent
active
051805944
ABSTRACT:
A sprue bushing which has improved heat transfer characteristics and a method of making the same are described. A cylindrical bushing body having a first, preselected uniform diameter has a cavity formed therein which axially extends within the bushing body for a predetermined length. A bushing inner core which has an outer layer or sleeve of a high heat conductive material is formed in the cavity extending between the two ends of the bushing body. A heating element in the form of a ceramic insulator sleeve is inserted into the bushing body cavity and a particulate refractory material is deposited into the cavity to fill the remainder of the cavity. When filled, the bushing body is swaged down to a second preselected uniform diameter to compact the powdered refractory together with the preformed sleeve to form a solid heating element. A runner passage is then drilled through the inner core.
REFERENCES:
patent: 4882469 (1989-11-01), Trakas
patent: 4922082 (1990-05-01), Bredt et al.
patent: 5052100 (1991-10-01), Trakas
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