The movement of the screw within the cylinder causes a pressure rise along the length of the screw. When the material reaches the nozzle, it experiences a change in area, and as a result, it undergoes pressure variation. The nozzle offers resistance to the flow of material, termed as Back-Pressure. The force with which the material dispensed is resultant of the pressure difference between the pump and the nozzle. As a result, it is extremely important to understand the screw parameters, the screw-nozzle combination and the operating conditions that maximize production.
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