Nonwoven Materials & Technical Textiles worked example

Basis Weight Variation at 99% target out-of-tolerance ceiling: a worked example

This scenario runs the basis weight variation calculation on the strong side: 99% target out-of-tolerance ceiling, with every other input held at its documented default. Use it when basis weight variation in nonwoven materials and technical textiles needs a clean rate and gap-to-target you can put on a tier board.

The inputs for this scenario

  • Rolls outside basis-weight tolerance: 8 count (unchanged)
  • Total rolls measured in run: 250 count (unchanged)
  • Target out-of-tolerance ceiling: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Basis weight variation rate = basis weight variation count ÷ total basis weight variation population × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 3.2 % for basis weight variation rate, the number this scenario is built around.
  • At this operating point the engine returns 95.8 points for basis weight variation gap to target.
  • At this operating point the engine returns 8 count for basis weight variation count.
  • At this operating point the engine returns 250 count for total basis weight variation population.

How this compares with the baseline

  • Against the tool's baseline example, where target out-of-tolerance ceiling sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • Use it at end-of-run or end-of-shift to grade web-forming consistency and decide whether the process is in control. 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

  • Basis weight variation rate: 3.2 % (headline result)
  • Basis weight variation gap to target: 95.8 points
  • Basis weight variation count: 8 count
  • Total basis weight variation population: 250 count

Run it with your numbers

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

Last reviewed 2026-05-12.