Injection Molding worked example

Injection Pressure with hydraulic system pressure during injection of 1,000 psi: a worked example

This worked example runs the injection pressure numbers for a tougher week than the baseline: hydraulic system pressure during injection of 1,000 psi instead of the typical 2,000 psi. Estimate required injection pressure from machine hydraulic pressure and intensification ratio for process setup and troubleshooting.

The inputs for this scenario

  • Hydraulic system pressure during injection: 1,000 psi (the input this scenario stresses; the baseline uses 2,000)
  • Intensification ratio (cylinder/screw area ratio): 10 :1 (held at the documented default)
  • Pressure loss factor: 0.92 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Plastic pressure = Hydraulic pressure x Intensification ratio x Loss factor.
  • Result works out to 9,200 psi at these inputs, and this is the headline figure for the scenario.
  • Gross pressure (hydraulic x ratio) works out to 9,200 value at these inputs.
  • Multiplier works out to 1 x at these inputs.
  • Factor A x B works out to 10,000 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where hydraulic system pressure during injection sits at 2,000 psi and the headline result is 18,400 psi, this scenario comes in 50% below the baseline at 9,200 psi.
  • Use it when selecting a press for a new tool, transferring a mold between machines, or diagnosing short shots that may be pressure-limited rather than temperature- or speed-related. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Result: 9,200 psi (headline result)
  • Gross pressure (hydraulic x ratio): 9,200 value
  • Multiplier: 1 x
  • Factor A x B: 10,000 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Injection Pressure calculator, set hydraulic system pressure during injection to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.