UV Curing worked example

UV Dwell Time Under Lamp at 23% dwell safety margin: a worked example

What does the result look like when dwell safety margin reaches 23%? The full calculation is worked below with real intermediate numbers. Use it on a conveyor line when the belt speed is fixed (paced by upstream equipment) and you need to know the dwell you actually have for dose math.

The inputs for this scenario

  • Lamp cure-zone length: 10 in (unchanged)
  • Conveyor belt speed: 30 ft / min (unchanged)
  • Dwell safety margin: 23 % (raised for this scenario; the documented default is 20)

Working through the calculation

  • Applying the documented formula (Base dwell (sec) = (cure-zone length ÷ 12) ÷ belt speed × 60) to the inputs above produces each figure below.
  • At this operating point the engine returns 0.41 sec under lamp for recommended dwell time, the number this scenario is built around.
  • At this operating point the engine returns 0.33 sec under lamp for base dwell (no margin).
  • At this operating point the engine returns 23 % for dwell margin applied.
  • At this operating point the engine returns 30 ft / min for belt speed.

How this compares with the baseline

  • Against the tool's baseline example, where dwell safety margin sits at 20% and the headline result is 0.4 sec under lamp, this scenario comes in 2.5% above the baseline at 0.41 sec under lamp.
  • A figure at this level is achievable when dwell safety margin is genuinely sustained, not just peaked for a shift. Dwell time alone does not guarantee cure; it must be paired with irradiance to know the actual dose, since a fast lamp and long dwell can still under-deliver energy.

Results at a glance

  • Recommended dwell time: 0.41 sec under lamp (headline result)
  • Base dwell (no margin): 0.33 sec under lamp
  • Dwell margin applied: 23 %
  • Belt speed: 30 ft / min

Run it with your numbers

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

Last reviewed 2026-05-12.