Yarn Clearer Cut Rate, Splice Load & Clearing Efficiency

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: Thin Place Cuts, Thick Place Cuts, Nep Cuts, Foreign Fibre Cuts, Faults Present in the Yarn, Winding Speed, Yarn Removed per Cut, Splice Cycle Time, Yarn Linear Density and Package 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 Total Cut Rate together with every supporting figure in one pass — no value is carried over from a previous entry.
4. The supporting outputs — Faults Removed, Faults Passing Through, Splices per Package, Production Time Lost, Cuts per Drum, Yarn Wasted, Waste Rate and Splices per Kilometre — 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 two loss figures are three orders of magnitude apart: 3.50% of the winding department against 0.03% of the yarn. Any discussion of clearer settings framed around waste is looking at the wrong number - the cost of clearing is machine time and splice count, and both are bought back only in fabric quality.

How to use it

1. Work through the input groups in order — Cut Channels and Winding Conditions. 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 Cut Rate in the dark results panel — that is the headline figure, expressed in 1/100 km.
4. Check the supporting rows underneath (Faults Removed, Faults Passing Through, Splices per Package, Production Time Lost, Cuts per Drum, Yarn Wasted, Waste Rate and Splices per Kilometre) 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 Cut Rate before a trial is booked, so machine time and material in Spinning, Winding & Yarn Package Engineering are committed against a calculated figure rather than an estimate.
• Costing and quotation — Total Cut Rate 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 Thin Place Cuts) shows how much of the gap in Total Cut Rate each variable explains.
• Teaching and study — the accepted ranges bracket normal Spinning, Winding & Yarn Package Engineering 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

• Cut rates are inputs from the clearer's own reporting, not predictions - no calculation derives them from thresholds, because that depends on the fault distribution of the specific yarn. Faults present should come from a Classimat or equivalent classification of the same yarn, and the two must be measured over comparable lengths for the clearing efficiency to mean anything; a clearing efficiency above 100% means the two figures came from different material or different fault definitions. Cut length varies with clearer type and with the fault length detected, so the waste figure is indicative. Production loss counts splice cycles only and excludes the ramp back to full winding speed after each restart, which adds a smaller further loss. Splices per package assume all cuts occur while that package is being built, which is true on average and not for any individual cone.
• Every input is bounded to the range normal practice occupies (Thin Place Cuts 0 to 200 1/100 km, Thick Place Cuts 0 to 200 1/100 km and Nep Cuts 0 to 200 1/100 km, 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

• USTER Classimat fault classification, the length-and-thickness grid the channels are set on.
• ASTM D1425 / ISO 16549 - unevenness testing by capacitance, from which the thresholds derive.
• ISO 2062 - single-end breaking force, for splice strength retention.

Questions people ask