More CTMP from SCA - Paper Technology International 2023 - Paper Technology International 2023 - Flipbook - Page 60

More CTMP from SCA - Paper Technology International 2023

PAPERTECHNOLOGYINTERNATIONAL More CTMP from SCA - Paper Technology International 2023
Quality
Ortviken’s facility is unique from a quality online measurement perspective,
where the aim is to do online quality classification of all pulp products, (something
that is not done at many mills), explains Maria Nordgren, Production manager, CTMP.
Including, for example, equipment from Pulp Eye and BTG, we have several online
measurement points along the process, (CSF (Canadian standard freeness), shives,
mean fibre length, brightness, spots and pH). We also use models to predict paper
properties, such as bulk and strength, explains Maria.
“Our technical capabilities, access to different types of wood, and know-how
mean that we now offer solutions to a much wider target group than before. For
example, two-stage refining and the screening stage will enable a freeness range
between CSF 350-750 ml as well as low shive contents. In addition, we will now
be able to offer above 83 % ISO in brightness (enabled by the two-stage bleaching
process). Add to that our in-house developed HT technology, providing outstanding
possibilities of bulk, both for spruce and birch”, says Sara Qvist, Product Manager,
CTMP.
Figure 6: Sara Qvist, Product Manager, CTMP
Figure 7: The three low consistency refiners.
HT is an in-house developed technique using higher
temperatures and pressure levels, which softens the lignin, allowing
the fibres to be separated more easily in the refiner. The result is
a pulp with greatly increased bulk levels and low shives content,
perfect for board customers with high demand for
bending stiffness.
“Furthermore, the extended chip wash
minimizes odour and taste issues, enabling
us to offer products that are approved for food
contact, i.e., meeting the high requirements in food
applications that applies to different segments
and markets. With that said, all our capabilities
combined will now make us relevant for a much
broader market, which is ideal” concludes Sara.
Technical challenges
Some compromises in the layout have
been made, given the fact that the facility is partly
built in old premises. The new plant has a lower
redundancy rate because there are more single
machines in several positions. Availability of such
equipment, as well as preventive maintenance,
becomes even more important. The disc filter
needs to be able to handle a wide range of
products and will not have the same productivity
across all grades.
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Figure 8: A newly erected building which houses dewatering,
two twin roll presses, two flash dryers and baling, as well as a
wrapping facility.

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