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Viscose plant

To develop and optimize regenerated cellulose, RISE has two viscose pilots, one on a micro scale and one for larger volumes of viscose solution. The pilots consist of six parts which together correspond to an actual manufacturing process.

Refining the raw material to obtain a greater value is interesting in the production of dissolving cellulose. In the RISE plant for viscose production, all steps from dissolving cellulose to finished viscose solution can be simulated.


In the mercerization step, cellulose is treated with sodium hydroxide to a slurry, which is pressed to obtain alkali cellulose. During decomposition, the pressed alkali cellulose decomposes to increase the reaction surface. This gives a more even oxygen distribution in subsequent fortification steps and a more even uptake of carbon disulfide during sulphidation. In the maturation step, the viscosity (DP) is reduced to a suitable level for further spinning of wire. After the sulphidation step, dissolution and post-ripening take place, after which the solution is ready to be spun into viscose fibers.

Viscose production

In the viscose pilot, individual pulps, as well as the suitability of different cellulose mixtures for viscose production can be evaluated. You can do screening experiments to investigate the effect of different process parameters on different dissolving celluloses and test how well a cellulose works at given process settings. It is also possible to evaluate different process chemicals, test different additives for fiber properties and so on.


Testbed name

Viscose plant - development of dissolving cellulose

Testbed category

Laboratory testbeds (LT)


Pulp, paper and packaging


Biorefinery, Pulp and paper, Material transition, Textile

Strategic innovation program



Region Västernorrland

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Test & demo

Spinning pilot - manufacture thread on a lab scale

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Viscose fiber characterization

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Analyzes of pulp for dissolving

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Molecule weight distribution

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