Injection Molding worked example

Pack & Hold Time with gate freeze time estimate of 2.25 sec: a worked example

Suppose gate freeze time estimate falls to 2.25 sec. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate pack and hold phase duration from gate freeze time, part thickness, and a safety factor for dimensional stability.

The inputs for this scenario

  • Gate freeze time estimate: 2.25 sec (the input this scenario stresses; the baseline uses 4.5)
  • Hold time base factor: 1 sec/sec (held at the documented default)
  • Safety extension factor: 1.1 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Hold time = Gate freeze time x Base factor x Safety extension.
  • Result works out to 2.48 sec at these inputs, and this is the headline figure for the scenario.
  • Gate freeze x Base factor works out to 2.48 value at these inputs.
  • Multiplier works out to 1 x at these inputs.
  • Factor A x B works out to 2.25 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where gate freeze time estimate sits at 4.5 sec and the headline result is 4.95 sec, this scenario comes in 50% below the baseline at 2.48 sec.
  • It estimates the recommended pack and hold time by scaling the gate freeze time with a base factor and a safety extension. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Result: 2.48 sec (headline result)
  • Gate freeze x Base factor: 2.48 value
  • Multiplier: 1 x
  • Factor A x B: 2.25 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Pack & Hold Time calculator, set gate freeze time estimate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.