Paper360 - July/August 2017 - 49

journals. This setup drives the dryer cylinders nearly loss-free in a force-fitted, torsionproofed way. In this process, the motor is
carried from the journal-no additional base,
console or frame is needed. A torque support
with ball joint head protects the machine
against the existing frame.
In 2014, AS Drives had realized a comparable drive project for the sister machine PM
6 at Mondi's Dynäs (Sweden) mill. The advantages of this compact drive technique and
the good results from that project prompted
Mondi to again choose AS Drives for the
Štĕtí project.
Yet the projects differ in the connection
from the FlexoDirect onto the dryer groups.
Previously, the FlexoDirect was used only
for the connection to the driving side; for
the project in Štĕtí, Mondi wanted a tendersided connection with this drive. Therefore,
the existing cylinder journal on the tender
side was ground straight and was extended
with an extracting link suitable for casting.
A mounting set was integrated axial into
the inside of the cylinder, so that the torque
could pass force-fitted into the face of the
journal. The support of the reaction torque
was designed by AS Drives engineers, so that
a good accessibility to the paper machine
remains without tensioning of the drive.
The drive layout for the complete machine
was layed-up by AS Drives per the specific
characteristic of the felt guidance in the dryer
section. The AS Drives engineers worked to
ensure that only two different motor types
are needed to equip the complete dryer
groups, despite the different layouts of the
dryer groups. This reduces inventory and

the variety of the components. Due to the
fact that synchronous machines come to
operation, high total efficiency factors can
be achieved.
The new system contains 26 FlexoDirect
drives. In spite of the high power of the
FlexoDirect, this motor has a compact
structure and, compared to conventional
drive solutions, fits well inside the dryer
hood (Fig. 5.) With the installation of the
FlexoDirect, no breakthrough of the dryer
hood is necessary, which leads to better heat
balance and a more beneficial hood design.
Because of the process-related higher
temperature inside of the hood, the motor
will be supplied with approximately 60-70°C
warm water during operation. This water is
provided by an external cooling unit within
a closed cooling water circuit.
Due to the precise control of the
FlexoDirect, the torsional rigid connection and the omission of mechanical components, Mondi Štĕtí got a smooth and
dynamic drive, which is expected to meet
future demands. The omission of the intermediate shafts, gearboxes and wheels reduce
the maintenance effort and the noise emission as well as the harmful vibrations inside
of the dryer group.

Fig. 4: Opened gearbox including gear pinions
(partly dismantled).

Fig. 5: Post dryer section of the PM 5.

NEW LUBRICATION TECHNOLOGY
As part of the rebuild project, AS also modernized the complete oil lubrication system
for the dryer section. The new oil lubrication system in the dryer section consists of
a Lubriflex Type 5000 central lubrication
unit, as well as 336 FlexoFlow intelligent flow
controllers, allocated to 16 terminals. The

Lubriflex lubrication unit involves all parts
necessary to provide the oil. Additionally, a
special degassing unit inside the tank of the
Lubriflex degasses the oil. After the oil treatment, the FlexoFlow takes over the allocation
of oil to the lube points.
Additional operating states like crawling,
startup, and partial load with different values
can be programmed-the FlexoFlow adjusts
these values fully automatically on demand.
Overflows of bearings due to cold oil will be
avoided. All data is provided to the mill's
process-leading system. An adjustment of
the oil flow values is also possible.
AS Drives installed all components for
the systems. Besides the piping work, this
included the setup of the Lubriflex as well as
the commissioning of the complete system.
Due to the optimal degassing features of the
Lubriflex and the fully automatic adjustment
of the FlexoFlow, Mondi Štĕtí received a reliable and environmentally-conscious lubrication technology with many advantages.
"The control of the drive gave us enormous
advantages in production, and with regard to
our quality standards," said Riesenberger.
"The problems with the oil leakages at the
closed wheel housings are 100 percent eliminated, so the maintenance effort was reduced
drastically. The reduction of the vibration as
well as the reduction of the noise level makes
the new drive a real 'silent drive.' All in all,
we are very happy with the rebuild."
Ramazan Ataman is a sales director for AS
Drives. Contact the author at r.ataman@asdrives.com, or learn more about AS Drives at
www.as-drives.com.

Paper360º JULY/AUGUST 2017

49


http://www.as-drives.com

Table of Contents for the Digital Edition of Paper360 - July/August 2017

Setpoint
Over the Wire
Euroports Extends Its Reach
Ensuring a Tight Load
Riding the Rails
Trailer Flooring Makes a Difference in Paper Roll Transport
Top 50 Power List
CEPI’s New Director General: ‘A Remarkable Industry'
Värö’s Expansion for the Future
Model Behavior: Understanding Virtual Process Integration
Mondi Štĕtí Chooses Direct Drive Technology
The Knowledge Trail
TAPPI Journal Summaries
How Does China’s Containerboard Market Compare to the US?
Industry Trends in Graphic Paper
Will China Ban Mixed Paper Imports?
TAPPI News
ASPI News
Index of Advertisers
Paper360 - July/August 2017 - intro
Paper360 - July/August 2017 - bellyband1
Paper360 - July/August 2017 - bellyband2
Paper360 - July/August 2017 - cover1
Paper360 - July/August 2017 - cover2
Paper360 - July/August 2017 - 3
Paper360 - July/August 2017 - 4
Paper360 - July/August 2017 - 5
Paper360 - July/August 2017 - Setpoint
Paper360 - July/August 2017 - 7
Paper360 - July/August 2017 - Over the Wire
Paper360 - July/August 2017 - 9
Paper360 - July/August 2017 - 10
Paper360 - July/August 2017 - 11
Paper360 - July/August 2017 - 12
Paper360 - July/August 2017 - 13
Paper360 - July/August 2017 - Euroports Extends Its Reach
Paper360 - July/August 2017 - 15
Paper360 - July/August 2017 - 16
Paper360 - July/August 2017 - 17
Paper360 - July/August 2017 - 18
Paper360 - July/August 2017 - 19
Paper360 - July/August 2017 - Ensuring a Tight Load
Paper360 - July/August 2017 - 21
Paper360 - July/August 2017 - Riding the Rails
Paper360 - July/August 2017 - 23
Paper360 - July/August 2017 - Trailer Flooring Makes a Difference in Paper Roll Transport
Paper360 - July/August 2017 - 25
Paper360 - July/August 2017 - 26
Paper360 - July/August 2017 - Top 50 Power List
Paper360 - July/August 2017 - 28
Paper360 - July/August 2017 - 29
Paper360 - July/August 2017 - 30
Paper360 - July/August 2017 - 31
Paper360 - July/August 2017 - 32
Paper360 - July/August 2017 - 33
Paper360 - July/August 2017 - 34
Paper360 - July/August 2017 - 35
Paper360 - July/August 2017 - 36
Paper360 - July/August 2017 - 37
Paper360 - July/August 2017 - CEPI’s New Director General: ‘A Remarkable Industry'
Paper360 - July/August 2017 - 39
Paper360 - July/August 2017 - 40
Paper360 - July/August 2017 - 41
Paper360 - July/August 2017 - Värö’s Expansion for the Future
Paper360 - July/August 2017 - 43
Paper360 - July/August 2017 - Model Behavior: Understanding Virtual Process Integration
Paper360 - July/August 2017 - 45
Paper360 - July/August 2017 - 46
Paper360 - July/August 2017 - 47
Paper360 - July/August 2017 - Mondi Štĕtí Chooses Direct Drive Technology
Paper360 - July/August 2017 - 49
Paper360 - July/August 2017 - The Knowledge Trail
Paper360 - July/August 2017 - 51
Paper360 - July/August 2017 - TAPPI Journal Summaries
Paper360 - July/August 2017 - 53
Paper360 - July/August 2017 - 54
Paper360 - July/August 2017 - 55
Paper360 - July/August 2017 - How Does China’s Containerboard Market Compare to the US?
Paper360 - July/August 2017 - 57
Paper360 - July/August 2017 - Industry Trends in Graphic Paper
Paper360 - July/August 2017 - 59
Paper360 - July/August 2017 - Will China Ban Mixed Paper Imports?
Paper360 - July/August 2017 - 61
Paper360 - July/August 2017 - 62
Paper360 - July/August 2017 - 63
Paper360 - July/August 2017 - 64
Paper360 - July/August 2017 - 65
Paper360 - July/August 2017 - 66
Paper360 - July/August 2017 - TAPPI News
Paper360 - July/August 2017 - ASPI News
Paper360 - July/August 2017 - 69
Paper360 - July/August 2017 - Index of Advertisers
Paper360 - July/August 2017 - cover3
Paper360 - July/August 2017 - cover4
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