Melt Spinning

Spin Finish Oil Pick-Up (OPU) Dosing Calculator

OPU is quoted as solids on yarn and metered as emulsion. Concentration and applicator efficiency both sit in between, and both are easy to forget.

Yarn & Target Specification
kg/h
% on yarn
Emulsion Applicator
% solids
%
kg/L

Emulsion Consumption

— kg/h

Metered to the applicator to hit the target OPU

Dosing

Finish Solids on Yarn
— kg/h
Metering Pump Rate
— mL/min
Emulsion per kg Yarn
— kg/kg
Finish Solids per Tonne
— kg/t
Emulsion Consumption
— kg/day

Under-oiled yarn charges statically and breaks in downstream processing; over-oiled yarn smokes on heated godets and fouls the draw texturing machine. Measure actual OPU by solvent extraction on the running package rather than trusting the dosing calculation alone.

Spin Finish Oil Pick-Up (OPU) Dosing Calculator — free, with the formula and a worked example, at Textile School.