Mold with porous cavity vent
AssigneeCalifornia Injection Molding Co., Inc.
InventorJohn G. Mitchell
Life of this patent
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Abstract
A mold for injection molding of long thin walled articles has precisely balanced high-volume venting of a narrow cavity space surrounding a long slender cantilevered core and minimized flash. The venting is provided by closing an end of the female mold cavity with a sintered metal plug and forming an end of the mold cavity in an end face of the plug.
Claims14
A mold for injection molding a long thin wall article comprising first and second mold parts mounted for relative motion between mold open and mold closed positions, said first mold part having a long slender cavity formed therein, said second part having a long slender core with an end extending into said cavity closely adjacent an end of said cavity, and a porous vent body mounted adjacent an end of said first mold part, said body having a portion with a recess that defines said end of said mold cavity and extends about said end of said cavity and at least partially about said core end.
In a mold for injection molding a long thin wall article having a length several times greater than its diameter, said mold having a female mold part with a long, small diameter, closed ended cavity therein, and a male mold part mounted for movement along the axis of said cavity to and from the female mold part between mold open and mold closed positions, said male mold part having a long slender cantilevered core that extends into said cavity in mold closed position closely adjacent walls of said cavity but spaced from and completely unsupported by said cavity, to define a narrow cavity space between said core and said female mold part, improved means for providing precisely balanced, high volume venting of said narrow cavity space without undue flash comprising
- a bore formed in the closed end of said female mold part cavity, said bore being aligned with and centered upon the axis of said cavity, and means for flowing vent gas both radially and axially from said closed end of said female cavity comprising a porous plug mated with and seated in said bore, said plug having a recess therein that defines the end of said cavity, said core having an end at least partially within said recess.
Dependencies are inferred from the claim text.