Rubber, Tires, Foam & Elastomer Manufacturing worked example

Extrusion Swell at 99% extruder uptime: a worked example

Push extruder uptime up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when extrusion swell in rubber, tires, foam and elastomer manufacturing is being asked to take on more work and you need to know if there is room.

The inputs for this scenario

  • Extruded profiles per die cycle: 4 units / cycle (unchanged)
  • Die cycles available this run: 480 cycles (unchanged)
  • Extruder uptime: 99 % (raised for this scenario; the documented default is 90)
  • Extrudate first-pass yield: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross extrusion swell capacity = extrusion swell output per cycle × available extrusion swell cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good extrusion swell capacity, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross extrusion swell capacity.
  • At this operating point the engine returns 19.2 units for extrusion swell downtime loss.
  • At this operating point the engine returns 57.02 units for extrusion swell yield loss.

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 10% above the baseline at 1,844 units.
  • It multiplies output per cycle by available cycles for gross capacity, then discounts that by uptime and first-pass yield to give the good, sellable output. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Good extrusion swell capacity: 1,844 units (headline result)
  • Gross extrusion swell capacity: 1,920 units
  • Extrusion swell downtime loss: 19.2 units
  • Extrusion swell yield loss: 57.02 units

Run it with your numbers

  • Every input above is editable in the live Extrusion Swell calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.