Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1989-07-03
1990-08-21
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
219421, 425567, 425589, B29C 4573
Patent
active
049501542
ABSTRACT:
A quick set sprue bushing for use in combination with injection molding apparatus. The bushing is made from a beryllium-free alloy that will rapidly dissipate heat. The alloy is of the copper, nickel type and reduces the cure time by between 15% and 20%. The significance of being beryllium-free is that it has been established that beryllium is a carcinogen and endangers workers. A bushing of this type results in the sprue or tail of the molten plastic type cooling as rapidly as possible for removal of the molded product from the mold. The bushing is elongated and has a generally conical passageway along its longitudinal centerline axis that diverges in the direction of the flow of material therethrough, and is further provided with a stainless steel bushing insert at the end that receives the injection mold apparatus nozzle such that the bushing will not conduct heat from the injection apparatus to the mold but will dissipate heat from the mold that comes from the molten material.
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Nichols, Malcolm A., "Use of Beryllium Copper in Plastic Molds", India Rubber World, N.Y., N.Y. (Apr. 1952), pp. 80-81.
Heitbrink Timothy W.
Swartwout, III Willis B.
Woo Jay H.
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