Patent ID: 9669586
Date: 2017-06-06
CPC Classifications: B29C,B29K,B33Y

Claim:
1. A material deposition system comprising: an extruder for deposition materials, the extruder comprising two or more material entry ports, a mixing chamber, and an exit orifice; and a controller coupled with the extruder, the controller configured and arranged to dynamically change delivery rates of the deposition materials to be mixed in the mixing chamber before flowing from the exit orifice; wherein the controller combines a desired volume flow rate of material to flow from the exit orifice with a mix ratio to specify the delivery rates of the deposition materials; wherein the extruder comprises two or more liquefication zones, each of the liquefication zones being associated with a respective one of the entry ports and each being configured and arranged to deliver a respective liquefied material to the mixing chamber, and wherein each of the liquefication zones has an entry cross sectional area and an exit cross sectional area, and the exit cross sectional area is less than the entry cross sectional area; and wherein each of the liquefication zones has at least one internal cross sectional area that is less than the entry cross sectional area and greater than the exit cross sectional area such that material travelling through the liquefication zone reduces in cross sectional area more than once as it travels from its entry port to the mixing chamber.