Fluid injecting nozzle having spaced projections

Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool

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Details

26432815, 425572, B29C 4520

Patent

active

054744393

ABSTRACT:
A nozzle body has a runner, a passage and an orifice, all communicating with one another to provide for fluid flow into and through the body. The fluid is heated during its flow through the nozzle body by an electrical heater on such body and by a heat conductive plug (e.g. copper) extending through the nozzle. A cap made from a heat insulating material (e.g. titanium) and disposed in a tight fit on the nozzle body has a gate well for receiving the fluid in the orifice and for injecting such fluid into a mold. The cap is constructed so that fluid cannot leak into the area around the cap when heated fluid flows through the gate well. The cap is also constructed so that the article formed in the mold from the fluid injected into the article will shear to provide a smooth peripheral surface when the article is ejected from the mold after solidifying. Fluid leakage is prevented by forming a first peripheral portion in the cap around the orifice and by disposing the cap so that the first portion is close to, but separated from, the mold when cold and expands with heat into even closer, but spaced, relationship with the mold. Second portions displaced along the cap periphery from the first portion are contiguous to the mold with the cap cold and abut the mold with the cap hot. Indentations in the cap periphery between the first and second portions insulate the second portions from the first portion.

REFERENCES:
patent: 4386262 (1983-05-01), Gellert
patent: 5324191 (1994-06-01), Schmidt

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