Paper Technology Journal 17 - Voith

Fig. 4: Huatai PM 10 final section.
Fig. 5: VariFlex L winder.
Fig. 6: The start-up team.
Fig. 7: Thune disc filter (on the left) and
EcoCell post-flotation deinking (on the right).
Fig. 8: The TwinDrum drum pulping system
(drum pulper on the left, drum screen on the
right).
● TopDuoRun dryer section, 7 dryer
groups (32 cylinders)
● EcoSoft Delta calender
● Sirius reel
● Dryer hood
● Hydraulics and pneumatics
● Control and Instrumentation and
automation
● Oil lubrication system
● Sets of spare parts
● Erection supervision
● Commissioning and training
● 2 two-drum winders VariFlex with
parent roll storage
● Packing and roll transportation system
● Tail threading
A VTT Turbo conveyor, installed with a
Flip Tray transfer device, provided the
threading solution at the Huatai mill. The
installed Flip Tray picks the tail up from
dryer 32 and places the tail on to the
conveyor. The VTT Turbo then transfers
the tail into the Ecosoft calender rope
nip. The VTT Turbo utilizes an internal air
turbine, driven by compressed air, to create
a stable vacuum and helps to optimize
the threading process throughout
the machine.
● Fabrics
With Voith Fabrics Quantum II AR running
on the 1st dryer section and Quantum
II on the remaining sections, the
Huatai PM 10 has seen improved fabric
life. Due to the success on the dryer section,
Voith Fabrics has received repeat
orders and provided the customer with
quick delivery times and superior service.
Voith Fabrics’ forming fabrics have also
performed well on the Huatai PM 9.
The recovered fiber system
Fiber Systems was responsible for the
complete recovered fiber system for
500 t/24 h deinked finished stock, from
the drum pulper charging system, right
through to thickening, storage, waste
water handling, chemicals treatment and
broke handling.
The drum pulper charging system was
supplied by group member B+G and is
designed to handle a mixture of 70%
AONP and 30% AOMG comprising up to
100% loose paper and bales. The equipment
included the complete conveyor
plant with bale breaker.
The TwinDrum drum pulper consists of
two separately rotating drum bodies
(drum pulper with integrated displacement
core and drum screen) (Fig. 8).
TwinDrum’s pulping and screening results
are clearly superior to other pulping
systems so far on the market as regards
deflaking, gentle fiber treatment and
avoidance of contaminant size reduction.
The pulped stock passes from the Twin-
Drum system to two-stage high consistency
cleaning (HiPro system) for efficient
removal of sand and heavy parti-
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cles. A two-stage forward-flow MC hole
screening system then follows, using a
MultiSorter (1.4 mm holes) in the first
and a Combisorter in the second stage.
MC hole screening is followed by threestage
IC cleaning with EcoMizer technology.
The cleaned stock is then fed to Eco-
Cell flotation (Fig. 7, right) consisting of
five primary and two secondary cells for
pre-flotation and four primary and one
secondary cell for post-flotation.
High performance 4-stage LC slot screening
with 0.15 mm C-bar screen baskets
follows the pre-flotation cells. This is
succeeded by thickening I and disperging
using a Thune disc filter (Fig. 7 left),
Thune screw press and a disc-type disperger.
Next comes HC oxidative peroxide
bleaching, post-flotation, thickening II,
reductive hydrosulfite bleaching and, finally,
storage of the finished stock.
Apart from the above mentioned process
equipment, Fiber Systems was additionally
responsible for the complete chemicals
preparation of the DIP plant, basic
process and control engineering as well
as for erection supervision. Plant commissioning
was undertaken in close teamwork
between Voith and Huatai.
17/04
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