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