Scouring Weight Loss & Peroxide Bleaching Bath Recipe

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 10 inputs are read from the form on every keystroke: Greige Charge, Liquor Ratio (1 : x), Non-Cellulosic Content, Scouring Efficiency, Additional Bleaching Loss, Peroxide Dose (as 100% H2O2), Commercial Peroxide Strength, Commercial Peroxide Density, Caustic Soda Dose and Stabiliser Dose.
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 Total Preparation Weight Loss together with every supporting figure in one pass — no value is carried over from a previous entry.
4. The supporting outputs — Bath Volume, Mass After Preparation, Scouring Loss Alone, Commercial Peroxide to Add, Available Active Oxygen, Caustic Soda Charge, Stabiliser Charge and Alkali to Peroxide Ratio — 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

Substituting

The peroxide figure is the one to sanity-check on the floor: 48.55 L against a 6 g/L recipe is nearly eight times the number a careless reading of the recipe suggests, and dosing 19.2 L because the recipe says 6 g/L x 3,200 L would under-bleach the batch by a factor of 2.5.

How to use it

1. Work through the input groups in order — Goods & Bath and Bleach Recipe. 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 Total Preparation Weight Loss in the dark results panel — that is the headline figure, expressed in %.
4. Check the supporting rows underneath (Bath Volume, Mass After Preparation, Scouring Loss Alone, Commercial Peroxide to Add, Available Active Oxygen, Caustic Soda Charge, Stabiliser Charge and Alkali to Peroxide Ratio) 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 Total Preparation Weight Loss before a trial is booked, so machine time and material in Wet Processing (Dyeing & Printing) are committed against a calculated figure rather than an estimate.
• Costing and quotation — Total Preparation Weight Loss 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 Greige Charge) shows how much of the gap in Total Preparation Weight Loss each variable explains.
• Teaching and study — the accepted ranges bracket normal Wet Processing (Dyeing & Printing) practice, so moving one variable at a time shows the shape of the relationship rather than a single answer.

Reading the result

Typical bands and what each one is telling you.

Assumptions and limits

• The peroxide density default of 1.13 g/mL is correct for 35% w/w at 20 C; a 50% drum is about 1.19 g/mL, and using the wrong density biases the volume by the ratio. Non-cellulosic content varies by growth and origin - Upland cotton typically 5 to 9%, but immature or rain-damaged fibre runs higher and the scouring loss follows it. Scouring efficiency is not a machine constant: it moves with temperature, time, alkali and wetting agent, and 85% represents a well-run exhaust process rather than a ceiling. The weight loss predicted here is preparation loss only and excludes desizing, mercerising and any singeing loss. Stabiliser dose is carried through as a charge but not modelled chemically; its correct level depends on water hardness and residual iron, which no recipe calculation can see.
• Every input is bounded to the range normal practice occupies (Greige Charge 1 to 5000 kg, Liquor Ratio (1 : x) 2 to 40 L/kg and Non-Cellulosic Content 1 to 20 %, 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.

Standards and further reading

• AATCC 128 and AATCC Test Method 79 - absorbency of bleached textiles, the routine check that scouring actually worked.
• ISO 105-A01 family - specimen preparation conventions for the goods this recipe produces.
• AATCC 102 - Hydrogen Peroxide, Determination of, in bleach baths by permanganate titration.
• ISO 3696 - water quality grades, which matter here because iron and copper catalyse peroxide decomposition.

Questions people ask