Yarn Spinning & Preparation

Roving Hank to Yarn Count Draft Predictor

Choosing the roving hank fixes the ring frame draft. Too high and the drafting zone cannot control the fibres.

Material Feed and delivery
Ne
Ne
Drafting Zone Machine limits
x
x

Total Draft Required

— x

Yarn count divided by roving hank

Drafting Breakdown

Main Draft
— x
Roving Linear Density
— tex
Yarn Linear Density
— tex
Coarsest Roving Within Draft Limit
— Ne
Headroom to Draft Limit
— %

Modern ring frames handle 35-45x on cotton. Pushing past the limit costs evenness long before it causes lapping.

Roving Hank to Yarn Count Draft Predictor — free, with the formula and a worked example, at Textile School.