Injection molding device and method

Details Injection molding device and method Injection molding device and method

1980-05-22

1982-07-06

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Temperature control

249 78, 249 79, 249 80, 264327, 26432816, 425548, 425552, B29F 108

Patent

active

043380689

ABSTRACT:
A novel method and device for precision injection molding is disclosed providing controlled cooling of a portion of the mold cavity surface during the molding cycle, or several such portions independently, and also, in the preferred embodiment controlled heating of a portion of the mold cavity surface during the molding cycle or several such portions independently, whereby high quality, high precision parts having close dimensional tolerances may be produced. Another aspect of the invention, a volume-controlled variable conductance heat pipe is disclosed, which novel heat pipe comprises housing means forming a sealed chamber, fluid, such as water or ammonia, within the chamber, wicking means and control means for controlling the thermal conductance of the heat pipe comprising means for controlling the volume of fluid in the liquid phase in the chamber. Preferably, the novel injection mold comprises a thin mold face supported at least in part by a foundation means which either incorporates, or is itself, a novel volume controlled variable conductance heat pipe as disclosed.

REFERENCES:
patent: 3733161 (1973-05-01), Nussbaum
patent: 3763293 (1973-10-01), Nussbaum
patent: 3827667 (1974-08-01), Lemelson
patent: 4072181 (1978-02-01), Kostura

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