In MoRe’s viscose pilot all steps from dissolving pulp to viscose dope can be simulated. As a result of the increased interest to get more value out of the forest raw material, producing dissolving pulps instead of paper pulps have become a hot topic.
In the mercerisation step the cellulose is treated with sodium hydroxide solution to form a slurry, which is pressed to get alkali cellulose. In the next step the pressed alkali cellulose is shredded to increase the contact are of the cellulose. This gives a more even oxygen distribution in the following aging step as well as more homogeneous uptake of carbon disulphide during the xanthation. In the ageing step the viscosity (DP) is reduced to a suitable level for later spinning of the viscose fibre. After the xanthation dissolving is done and there ripening takes place before the dope is ready to be spun to viscose fibres.
In the viscose pilot the suitability of various dissolving pulps, as well as pulp mixtures, for viscose production can be evaluated. Screening trials can be done to evaluate impact from different process parameters on different dissolving celluloses as well as testing suitability of a dissolving pulp for a certain viscose process. It is also possible to evaluate effects from process chemicals, testing additives to achieve certain viscose fibre properties and so on.
We can characteraize the fibres: