Strength Splice against parent yarn

Yarn Breaking Force cN

Splice Breaking Force cN

CV of Splice Strength %

Downstream Running Tension cN

Geometry & Package Bulk and how many there are

Yarn Diameter um

Splice Diameter um

Splice Length mm

Splices per Package

Strength Retention

— %

Splice breaking force against the parent yarn

Bulk, Variability & Risk

Retention at the Weakest Splice: — %
Splice to Yarn Diameter: — x
Bulk Added: — %
Weakest Splice Force: — cN
Safety Factor at the Weakest Splice: — x
Strength Given Up: — cN
Splice Length in Yarn Diameters: — x
Splices in the Package: —

Both breaking forces must be measured on the same instrument at the same gauge length and in the same conditioned atmosphere; a splice tested at a shorter gauge length than the yarn will flatter the retention. The weakest-splice estimate uses three standard deviations below the mean as a practical worst case, which assumes an approximately normal splice strength distribution - real splice populations are often left-skewed with occasional very poor joints, so the true worst case in a large package is likely below this. Splice diameter should be measured optically at the thickest point rather than averaged along the joint. Splices per package is used here only to describe the population; the calculation is per splice and does not compound risk across the package.

Yarn Splice Strength Retention, Bulk & Weakest-Splice Risk — free, with the formula and a worked example, at Textile School.