Overall Moisture Management Capability from MMT Indices

The formula

This is the expression the tool evaluates. Every term is named underneath, with the unit it must be supplied in.

How the result is derived

Step by step, from the values you type to the figure on screen.

1. The 12 inputs are read from the form on every keystroke: Bottom Absorption Rate, One-Way Transport Capability, Bottom Spreading Speed, Absorption, Index Zero, Absorption, Index One, Transport, Index Zero, Transport, Index One, Spreading, Index Zero, Spreading, Index One, Absorption Weight, Transport Weight and Spreading Weight.
2. Each value is checked against the accepted range in the input table below. A value outside its range stops the calculation rather than producing a misleading figure — the results blank out and a message appears.
3. The validated values are substituted into the expression above, which resolves Overall Moisture Management Capability together with every supporting figure in one pass — no value is carried over from a previous entry.
4. The supporting outputs — Absorption Index, One-Way Transport Index, Spreading Index, OMMC Grade, Absorption Contribution, Transport Contribution, Spreading Contribution, Weakest Index, OMMC if the Weakest were Perfect and Gap to the Next Grade — come from the same pass, so they always describe the same case as the headline figure.
5. Results are rounded for display only. The full-precision value is used throughout the chain, so reading a rounded intermediate figure back into the tool by hand can shift the last digit.

What each input means

Where to read each value on the floor, the unit it must be in, and the range the tool accepts.

What the tool returns

The headline figure and every supporting value it is built from.

Worked example

The tool loads with this case already solved — the Overall Moisture Management Capability shown above is its answer. Change one value and the difference from this baseline is the sensitivity of the result to that variable.

How to use it

1. Work through the input groups in order — Measured Values, Index Anchors and Weighting. The defaults are a realistic case, so you can change one value at a time and watch what moves.
2. There is no calculate button. Every figure recalculates as you type or drag, which is what makes this usable for a what-if sweep rather than a single answer.
3. Read Overall Moisture Management Capability in the dark results panel — that is the headline figure, expressed in index.
4. Check the supporting rows underneath (Absorption Index, One-Way Transport Index, Spreading Index, OMMC Grade, Absorption Contribution, Transport Contribution, Spreading Contribution, Weakest Index, OMMC if the Weakest were Perfect and Gap to the Next Grade) before acting on the headline — they are where an implausible input usually shows itself first.
5. Reset to defaults returns every field to the reference case, which is the quickest way to check whether a surprising result came from the tool or from an input you had changed earlier.

Where this is used

• Process planning — establishing Overall Moisture Management Capability before a trial is booked, so machine time and material in Textile Testing & Quality Control are committed against a calculated figure rather than an estimate.
• Costing and quotation — Overall Moisture Management Capability is an input to the cost sheet, and quoting from a worked number rather than a remembered one is what keeps a margin intact.
• Troubleshooting — when the floor result drifts from plan, entering the measured values (starting with Bottom Absorption Rate) shows how much of the gap in Overall Moisture Management Capability each variable explains.
• Teaching and study — the accepted ranges bracket normal Textile Testing & Quality Control practice, so moving one variable at a time shows the shape of the relationship rather than a single answer.

Assumptions and limits

• The published method grades each measured value into one of five bands and then blends the grades; this tool interpolates linearly between a declared pair of anchors instead, which is smoother, better for comparing two fabrics inside the same band, and will not reproduce a laboratory report exactly at a band boundary. Where a certificate is being matched, set the anchors to the band edges of the grade in question and read the result as an interpolation within it. One-way transport is the index most sensitive to test conditions and the one most often misread: it is a difference between the two faces, so a fabric can post a high value by being poor on the top face rather than good on the bottom, and a large positive OWTC with a low absorption index usually means exactly that. Nothing measured here is comfort. OMMC describes what a fabric does with a fixed dose of liquid on a bench at fixed humidity, and the wearer experience depends on evaporation into moving air, on garment fit and on where the fabric touches at all - which is why two fabrics with the same OMMC can feel entirely different in wear.
• Every input is bounded to the range normal practice occupies (Bottom Absorption Rate 0 to 400 %/s, One-Way Transport Capability -600 to 1500 index and Bottom Spreading Speed 0 to 30 mm/s, and so on for the rest). Those bounds are guard rails against typing errors, not a claim that the formula fails one unit outside them.
• The calculation is deterministic: the same inputs always give the same result. It carries no allowance for machine condition, operator skill, ambient conditions or lot-to-lot material variation unless an input above explicitly represents one.
• Nothing is sent anywhere. The maths runs in your browser, so the numbers you type never leave the page.

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