Shear-inducing injection molding system

An injection nozzle assembly for a polymer molding system comprising:

• an injection nozzle configured to receive polymer in a fluidic state, the injection nozzle configured to interface with a mold cavity and changeable between open and closed positions;
• the injection nozzle comprising a tubular valve body defining a pin axis, a central axial passage extending along the pin axis and configured to dispense polymer into the mold cavity, and an elongated valve pin movably disposed in the central axial passage;
• the valve pin being axially translatable between a projected position when the injection nozzle is in the closed position, and a retracted position when the injection nozzle is in the open position;
• and
• the valve pin further being rotatably movable and operable to induce shear on the polymer;
• wherein the valve pin is controlled to rotate at a speed selected to prevent a viscosity of the fluidic polymer from exceeding a predetermined maximum viscosity limit associated with the onset of solidification of the polymer.