Drawing
Every point of tenacity drawing buys is paid for in elongation. The draw ratio sets both at once — there is no setting that gives only the good half.
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Draw godet speed over feed godet speed
The tenacity exponent and the inverse elongation rule are empirical and only hold inside the polymer's workable draw window — past the natural draw ratio the yarn does not get stronger, it breaks. Draw temperature moves both relationships, so fit the exponent at the temperature you actually run.
Godet Draw Ratio & Molecular Orientation Predictor — free, with the formula and a worked example, at Textile School.