Blow Molding & Hollow Plastic Products worked example

Cooling Time at 9.2% cooling and handling allowance: a worked example in blow molding & hollow plastic products

This scenario runs the cooling time calculation on the strong side: 9.2% cooling and handling allowance, with every other input held at its documented default. a processor needs to schedule production when cooling time is the limiting part of the blow molding cycle

The inputs for this scenario

  • Mold cycles requiring cooling: 2,200 units (unchanged)
  • Cooling-limited cycle rate: 260 units / hr (unchanged)
  • Cooling and handling allowance: 9.2 % (raised for this scenario; the documented default is 8)

Working through the calculation

  • Applying the documented formula (Base cooling cycle time = mold cycles requiring cooling รท cooling-limited cycle rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 9.24 hr for required cooling-limited run time, the number this scenario is built around.
  • At this operating point the engine returns 8.46 hr for base cooling cycle time.
  • At this operating point the engine returns 9.2 % for cooling and handling allowance.
  • At this operating point the engine returns 260 cycles / hr for cooling-limited cycle rate.

How this compares with the baseline

  • Against the tool's baseline example, where cooling and handling allowance sits at 8% and the headline result is 9.14 hr, this scenario comes in 1.11% above the baseline at 9.24 hr.
  • Use it when scheduling a cooling-bound job, or when evaluating how much a mold-cooling improvement would compress run time and free machine hours. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Required cooling-limited run time: 9.24 hr (headline result)
  • Base cooling cycle time: 8.46 hr
  • Cooling and handling allowance: 9.2 %
  • Cooling-limited cycle rate: 260 cycles / hr

Run it with your numbers

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

Last reviewed 2026-05-12.