Conjugate Spinning

Bicomponent Spinneret Flow Ratio Optimizer

Specify by mass, build by volume. With two different melt densities those are not the same split, and the cross-section shows it.

Filament Target
dtex
%
no.
m/min
Polymers Melt densities
g/cm³
g/cm³

Core-to-Sheath Volume Ratio

— ×

The ratio the spinneret geometry must deliver

Stream Flows

Core Mass Flow
— g/min
Sheath Mass Flow
— g/min
Core Volume Flow
— cm³/min
Sheath Volume Flow
— cm³/min
Core Share of Cross-Section
— %
Total Throughput
— kg/h

Equal volume flows do not guarantee a concentric fibre: the more viscous melt migrates to the low-shear region, so a large viscosity mismatch between the two polymers will distort the interface whatever the geometry says. Match melt viscosities at the spinning temperature as well as the flows.

Bicomponent Spinneret Flow Ratio Optimizer — free, with the formula and a worked example, at Textile School.