Paper Technology Journal 17 - Voith

6
further, because the rectifier roll can offer
advantages especially with stock of a
high freeness.
The high requirements for cigarette paper
on porosity and formation at the same
time are a challenge for wire section dewatering.
In order to achieve optimum
formation, a DuoShake is used. The benefits
of this reaction-free shaking unit,
which is unique on the market, were so
convincing for Hengfeng that the existing
shaking unit at the PM 10 was replaced at
the same time.
The Combi 2 press is characterized by
the closed web run from the wire section
until after the second press nip. Hence,
the first free draw is after completion of
mechanical dewatering. Due to the low
sheet weight, high paper strength is the
basic condition for high machine efficiency.
The following marking press is feltless
and includes the Nipco technology.
3
Fig. 3: Hengfeng PM 12.
Fig. 4: TwinFlo double disc refiners.
Fig. 5: SpeedFlow.
Fig. 6: Final section PM 12.
Thus, the linear force and, therefore, the
intensity of marking can be adjusted over
a wide range – and with roll lives that are
two to three times longer!
Small dryer groups and sheet stabilization
ensure the maximum machine efficiency
also in the dryer section. A Speed-
Flow ensures a uniform application of
glow salt and size. The proven reel ensures
an excellent wind-up quality. In
addition, Voith is responsible for broke
preparation, the chemical additives
preparation and metering as well as fiber
recovery.
Voith Fabrics has an important share in
the high quality of the end product. For
example, one hundred percent of the
press felts and dryer fabrics are from
Voith Fabrics. In the press section,
Omega 2 felts are used, and in the dryer
section, the Velvet and Quantum II dryer
fabrics. These innovative products, along
Technical data
Paper grades cigarette paper
Sheet weight 25-45 g/m 2
Wire width 3,800 mm
Untrimmed working width 3,300 mm
Design speed 600 m/min
35
Operating speed 190-350 m/min
Theoretical gross production 41 t/24 h
with the paper quality, also improve the
machine efficiency and production line
efficiency.
Perspectives
With Voith, Hengfeng have found a partner
who is available for technological
support even after the guarantee period.
This is particularly important for specialty
papers. We are therefore very pleased
that Hengfeng appreciated our performance
with the placement of a subsequent
order in September 2003. From
autumn 2004, the new PM 14 will produce
filter wrapping papers.
After Minfeng PM 18, Voith again proved
with Hengfeng PM 12 that Voith is the
first-choice supplier for cigarette paper
lines. At the same time, Hengfeng took a
long step towards their goal of becoming
the leading producer of cigarette paper in
China.
17/04