More CTMP from SCA - Paper Technology International 2023 - Paper Technology International 2023 - Flipbook - Page 59

More CTMP from SCA - Paper Technology International 2023

PAPERTECHNOLOGYINTERNATIONAL More CTMP from SCA - Paper Technology International 2023
The CTMP expansion
“Significant focus has been placed on the design of the
facility, above all to create capabilities for an impressively broad
product portfolio. This incorporates the ability to use different fibre
raw materials and for developing the pulp properties over several
refining stages”, continues Anders.
“The wood handling department from the old mill is fully
repurposed, but in order to efficiently handle different types of wood
the number of chip silos has increased from one to three. Normally
they would contain spruce chips, birch chips and sawmill chips, but
different types of wood can be run in campaigns. An extended chip
wash has been constructed to reduce odour and taste issues in the
finished product. Within the pulp mill, the primary and secondary
refiner and screening are reused, but now supplemented with a chip
bin, impregnation, and preheater, as well as three low consistency
refiners. Steam separation after primary refining is made using
a perivapor. The disc filter has been rebuilt to handle the pulp’s
dewatering for the different qualities”, explains Anders.
Figure 3: Wood chip silos and input of sawmill chips.
To produce birch CTMP, a new cleaning stage has been
installed, cleaning birch pulp from black spots as well as the
separation of stone cells. And the bleach plant has been rebuilt to
facilitate two-stage bleaching, MC (medium consistency, approx.
8%), followed by HC (High Consistency, approx. 40%), with NaOH
(sodium hydroxide), H2O2 (hydrogen peroxide) and NaSiO2
(sodium silicate) as active bleaching chemicals. A new building has
been erected which houses dewatering, two twin roll presses, two
flash dryers and baling, as well as a wrapping facility. The facility
is designed for a capacity of 300,000 tons a year, meaning that
production will more than triple from today’s 90,000 tons.
“Everything is proceeding according to plan, and we are now
working on qualifying existing products. As products are approved
in terms of quality, production is moved from Östrand to Ortviken
(Östrand will be shut down when everything is ready). Thanks to our
formidable experience, we are also developing new products, and
with our new state-of-the-art facility, plus the unique access we have
to different types of certified wood and the R&D resources we have,
we are certainly well equipped to develop completely new solutions.
Above all, and what has been so much appreciated and successful
so far, is that we can continue to develop these solutions together
with our customers”, says Stefan Sjöström, Director of Global Sales.
Figure 4: Primary and secondary refiners.
Figure 5: Stefan Sjöström, Director of Global Sales, CTMP.
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