Extrusion Output Calculator

Work out extrusion output instantly with clear inputs, formula shown and shareable results.

About Extrusion Output Calculator

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.

Formulas

Throughput

kg/h = screw rpm x specific output kg/h per rpm

Saleable output

Good kg = total kg x (1 - scrap fraction)

Worked example

With the default values below, Extrusion Output Calculator returns Extruder throughput of 54.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Screw speedminimum 1 rpm: 60 rpm
Specific outputminimum 0.01 kg/h per rpm: 0.9 kg/h per rpm
Operating hoursminimum 0.1 h: 20 h
Scrap and start-up wasteaccepts 0–40 %: 3 %

Results

Extruder throughput: 54.00 kg/h
Total material processed: 1,080.0 kg
Saleable output: 1,047.6 kg
Scrap generated: 32.4 kg

Step by step

1Values used
2Throughput
3Saleable output
4Extruder throughput= 54.00 kg/h
5Total material processed= 1,080.0 kg
6Saleable output= 1,047.6 kg
7Scrap generated= 32.4 kg

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Extrusion Output figure worked out?

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.

Does output stay linear at high 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.

What values do I need to enter?

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.