The RISE institutes Innventia, SP and Swedish ICT have merged in order to become a stronger research and innovation partner for businesses and society.
During 2017 will be one of several websites within RISE. Please visit for more information about RISE.

Extrude lignin to fibers

In our test bed for lignin-based carbon fibre, we can extrude (spin) lignin into fibres (filaments) and convert those to carbon fibres.


We have two different extruders for spinning of lignin fibres:
In the monofilament extruder, small quantities of material are used in order to screen the proccesability of the lignin.
For larger quantities we have a multifilament extruder that can spin up to 80 filaments.

The lignin fibres are converted into carbon fibres via several heat treatment steps (see figure above). Today the conversion is done in batches, where stress can be applied to the fibres during the heat treatment in our specially designed equipment.

Currently, we are also designing equipment where the stabilization and carbonisation can be performed (semi-) continuously.

The mechanical properties of the fibres can be determined between each treatment step and their chemical composition and the visual appearance can be determined.

It also possible to convert other materials than lignin in our test bed facility. So far lignin has been the major raw material, but cellulose has also been converted.

We are also planning for a larger pilot plant facility for continuous conversion of lignin into carbon fibre.

Spinning equipment:
Monofilament-extruder (Xplore Instruments), 15 g materialMultifilament-extruder (AJA Inc.), 0.5-2 kg materialTube furnaces for carbonisation (≤1700°C)

Melting microscopy 
Mechanical tester (Diastron) 
Light microscopy 


Sverker Danielsson
+46 8 676 7366
Send mail