Yarn Spinning & Preparation

Rotor (Open-End) Spinning Production Calculator

Rotor output scales directly with delivery speed and yarn coarseness, unlike ring spinning.

Spinning Conditions Rotor unit
m/min
Ne
rpm
Machine & Shift Production basis
no.
95%
50% 100%
h

Output per Shift

— kg

One machine at the stated efficiency

Production & Twist

Machine Output
— kg/h
Output per Rotor
— kg/h
Twist Inserted
— TPM
Twist Inserted
— TPI

Rotor yarns need roughly 10-20% more twist than ring yarns for the same strength. Check the twist figure against the rotor diameter and yarn count before committing.

Rotor (Open-End) Spinning Production Calculator — free, with the formula and a worked example, at Textile School.