DTY Texturing Output, Doff Cycle & Denier Economics

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 8 inputs are read from the form on every keystroke: Feed (POY) Denier, Draw Ratio, Take-up Speed, Positions, Machine Efficiency, Package Mass at Doff, Running Hours per Year and Conversion Cost per Position-Hour.
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 Machine Output together with every supporting figure in one pass — no value is carried over from a previous entry.
4. The supporting outputs — Textured (DTY) Denier, Textured Count, Output per Position, Given Up to Efficiency, Output per Day, Output per Year, Doff Cycle, Doffs per Position per Day, Packages per Day, Cost per Position-Day and Conversion Cost per Kilogram — 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 Machine Output 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 — Yarn and Machine. 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 Machine Output in the dark results panel — that is the headline figure, expressed in kg/h.
4. Check the supporting rows underneath (Textured (DTY) Denier, Textured Count, Output per Position, Given Up to Efficiency, Output per Day, Output per Year, Doff Cycle, Doffs per Position per Day, Packages per Day, Cost per Position-Day and Conversion Cost per Kilogram) 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 Machine Output before a trial is booked, so machine time and material in Polymer Rheology & Synthetic Extrusion are committed against a calculated figure rather than an estimate.
• Costing and quotation — Machine Output 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 Feed (POY) Denier) shows how much of the gap in Machine Output each variable explains.
• Teaching and study — the accepted ranges bracket normal Polymer Rheology & Synthetic Extrusion practice, so moving one variable at a time shows the shape of the relationship rather than a single answer.

Assumptions and limits

• Output here is the count times the speed and nothing else, which is the arithmetic of the winder rather than a promise about the process: it assumes the position is actually running yarn whenever the machine is counted as up, and machine efficiency is doing all the work of representing string-up, breaks, doffing losses and waiting for an operator. Where a mill measures its own efficiency against delivered kilograms, that measured figure belongs in this field rather than a nameplate number. The draw ratio converts feed denier to textured denier by conservation of mass and takes no account of the small length change that texturing itself contributes, so a measured DTY count usually sits a little above the figure here; where the difference matters, enter the measured count as the feed denier with a draw ratio of one. The conversion cost per kilogram is the honest reason to look at this tool twice. It is the position-hour cost divided by output per position, so it rises as denier falls, and it is why the same machine running the same hours can be profitable on one order and not on another. Nothing here prices the yarn or the POY; it prices the conversion only.
• Every input is bounded to the range normal practice occupies (Feed (POY) Denier 20 to 1200 den, Draw Ratio 1 to 2.5 x and Take-up Speed 100 to 1500 m/min, 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.

Questions people ask