Mold device for an injection molding machine

Claim 1

A mold device for the production of molded articles by an injection molding machine, said machine including a fixed side and movable elements, comprising: a mounting portion adapted to utilize a hot runner system by mounting a heater plate on a mounting plate on said fixed side and incorporating a runner nozzle in communication with the runner formed within said heater plate, said runner nozzle having a tip portion and an outlet orifice; a mold plate on said fixed side, said mold plate having a runner concave portion formed as a depression in an installing surface portion of said mold plate, said concave portion having an inlet opening opposed to said nozzle orifice of said runner nozzle to receive molten material when flowing from said nozzle orifice; said nozzle outlet orifice having an internal diameter and said inlet opening having an internal diameter, said inlet opening internal diameter at least one-third greater than said nozzle orifice internal diameter, whereby a very imprecise lateral alignment is permissable between said nozzle outlet orifice and said inlet opening and a large number of different mold plates may be used interchangeably with said runner nozzle and said fixed side; a gate which is in communication with the interior of a mold cavity, opening from the bottom of said runner concave portion, the inlet to said gate being separated from said nozzle orifice by a distance sufficient to produce a waste sprue corresponding substantially to said concave portion, said waste sprue produced during the molding of each of said articles and separable from said nozzle after the molding of each of said articles; and a stripper means movable relative to said nozzle for stripping said waste sprue from said nozzle.