Fiber & Raw Material Engineering

Effective Length & Short Fiber Index Estimator

Short fibre drives neps, ends-down and irregularity. Estimate it before the mix is laid down.

Fibrogram HVI length data
inch
%

Short Fiber Index

— %

Fibres shorter than 12.7 mm, by weight

Length Metrics

Upper Half Mean Length
— mm
Mean Length
— mm
Mean Length
— inch
Fibres Above 12.7 mm
— %

The regression is calibrated on upland cotton. Extra-long staple and man-made blends need direct AFIS measurement rather than an HVI estimate.

Effective Length & Short Fiber Index Estimator — free, with the formula and a worked example, at Textile School.