Rubber, Tires, Foam & Elastomer Manufacturing worked example

Extrusion Swell at 65% extruder uptime: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop extruder uptime to 65%, then walk the calculation through step by step. Estimate extrusion swell for rubber, tires, foam and elastomer manufacturing using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.

The inputs for this scenario

  • Extruded profiles per die cycle: 4 units / cycle (held at the documented default)
  • Die cycles available this run: 480 cycles (held at the documented default)
  • Extruder uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • Extrudate first-pass yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross extrusion swell capacity = extrusion swell output per cycle × available extrusion swell cycles.
  • Good extrusion swell capacity works out to 1,211 units at these inputs, and this is the headline figure for the scenario.
  • Gross extrusion swell capacity works out to 1,920 units at these inputs.
  • Extrusion swell downtime loss works out to 672 units at these inputs.
  • Extrusion swell yield loss works out to 37.44 units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where extruder uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 27.78% below the baseline at 1,211 units.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to extruder uptime, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It treats uptime and yield as single averages, so it won't tell you which die, compound or shift is driving the swell-related scrap.

Results at a glance

  • Good extrusion swell capacity: 1,211 units (headline result)
  • Gross extrusion swell capacity: 1,920 units
  • Extrusion swell downtime loss: 672 units
  • Extrusion swell yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Extrusion Swell calculator, set extruder uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.