Plastics Extrusion - Pipe, Film & Profile worked example
Cooling Tank Dwell at 14% extra cooling margin: a worked example
Suppose extra cooling margin falls to 14%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate cooling tank dwell time from required cooled length, line speed, and an allowance for thicker walls or hot melt conditions.
The inputs for this scenario
- Cooling or calibration section length: 60 ft (held at the documented default)
- Extrusion line speed: 12 ft / min (held at the documented default)
- Extra cooling margin: 14 % (the input this scenario stresses; the baseline uses 20)
Working through the calculation
- The calculation starts from the formula this tool documents: Base time = cooling or calibration length รท line speed.
- Adjusted cooling dwell works out to 5.7 min at these inputs, and this is the headline figure for the scenario.
- Base dwell time works out to 5 min at these inputs.
- Cooling allowance applied works out to 14 % at these inputs.
- Line speed works out to 12 ft / min at these inputs.
How this compares with the baseline
- Against the tool's baseline example, where extra cooling margin sits at 20% and the headline result is 6 min, this scenario comes in 5% below the baseline at 5.7 min.
- It computes the base residence time of the part in the cooling tank and then applies a cooling margin to give an adjusted target dwell. 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
- Adjusted cooling dwell: 5.7 min (headline result)
- Base dwell time: 5 min
- Cooling allowance applied: 14 %
- Line speed: 12 ft / min
Run it with your numbers
- To rerun this with your own numbers, open the live Cooling Tank Dwell calculator, set extra cooling margin to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.