Work out extrusion output instantly with clear inputs, formula shown and shareable results.
A single screw extruder is close to a positive displacement pump, so throughput rises almost linearly with screw speed. The specific output in kilograms per hour per rpm is a property of the screw geometry and the polymer, measured once and then used to plan production and material orders.
Throughput
kg/h = screw rpm x specific output kg/h per rpm
Saleable output
Good kg = total kg x (1 - scrap fraction)
kg/h = screw rpm x specific output kg/h per rpm. A single screw extruder is close to a positive displacement pump, so throughput rises almost linearly with screw speed.
Not indefinitely. Head pressure, melt temperature and feed limitations flatten the curve, and beyond a point extra speed only raises melt temperature and degrades the product.
This calculator takes 4 inputs: Screw speed, Specific output, Operating hours, Scrap and start-up waste. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.