Plastics Extrusion - Pipe, Film & Profile worked example

Breaker Plate Pressure Drop with baseline melt pressure of 4,500 psi: a worked example

What does the result look like when baseline melt pressure reaches 4,500 psi? The full calculation is worked below with real intermediate numbers. Use it when rising head pressure may trigger screen changes, reduce output, or exceed extruder and die limits.

The inputs for this scenario

  • Baseline melt pressure: 4,500 psi (raised for this scenario; the documented default is 1,800)
  • Screen or breaker restriction factor: 1.18 x (unchanged)
  • Operating time at condition: 8 hr (unchanged)

Working through the calculation

  • Applying the documented formula (Breaker Plate Pressure Drop = baseline melt pressure × screen or breaker restriction factor) to the inputs above produces each figure below.
  • At this operating point the engine returns 5,310 psi for estimated pressure drop load, the number this scenario is built around.
  • At this operating point the engine returns 664 psi / hr for pressure load per hour.
  • At this operating point the engine returns 4,500 psi for baseline melt pressure.
  • At this operating point the engine returns 1.18 x for restriction factor.

How this compares with the baseline

  • Against the tool's baseline example, where baseline melt pressure sits at 1,800 psi and the headline result is 2,124 psi, this scenario comes in 150% above the baseline at 5,310 psi.
  • A figure at this level is achievable when baseline melt pressure is genuinely sustained, not just peaked for a shift. The restriction factor is an empirical multiplier, not a flow-and-geometry model — it won't capture non-linear clogging or shear-thinning behavior near the pressure limit.

Results at a glance

  • Estimated pressure drop load: 5,310 psi (headline result)
  • Pressure load per hour: 664 psi / hr
  • Baseline melt pressure: 4,500 psi
  • Restriction factor: 1.18 x

Run it with your numbers

  • Every input above is editable in the live Breaker Plate Pressure Drop calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.