Patent ID: 8715547

Claim:
A method of controlling commencement of an injection of a melt stream of moldable material from an auxiliary injection unit comprising the steps of: positioning a sensor in an injection molding system to sense a condition related to an injection of a first melt stream of a first moldable material provided by a primary injection unit, wherein the first melt stream flows along a first melt path of the injection molding system; and commencing an injection of a second melt stream of a second moldable material from the auxiliary injection unit upon the sensed condition related to the injection of the first melt stream being detected at a preselected value, wherein the second melt stream flows along a second melt path of the injection molding system, wherein the step of commencing the injection of the second melt stream is controlled by an auxiliary injection unit controller and a signal from the auxiliary injection unit controller to start the commencing step is independent of a primary injection unit controller.