Paper360 - July/August 2017 - 48

techlink | DRIVES

Mondi Šte˘tí Chooses
Direct Drive Technology
RAMAZAN ATAMAN

Fig. 1: The FlexoDirect direct drive.

Fig. 2: A conventional drive with electrical motor,
pre-gear and shaft, outside the dryer hood.

Fig. 3: A closed gearbox on the PM 5 dryer
groups, with steam heads already removed.

48

Paper360º

JULY/AUGUST 2017

When Mondi began planning
a major rebuild of the PM 5 sack kraft
paper machine at its Štĕtí mill in the Czech
Republic, one major goal was to eliminate
the maintenance-intensive and trouble-prone
wheel housing drive. In October 2015, the
mill produced kraft paper for the first time
with the help of a newly-installed direct drive
system. Within the scope of the rebuild, the
design speed for the drive was increased to
1200 m/min. AS Drives & Services GmbH (AS
Drives), as general contractor for this turnkey
project, modernized the complete drive and
lubrication technology of PM 5.
Mondi Štĕtí belongs to South Africanbased Mondi Group, a leading international
producer of sack paper and special kraft
paper. Helmut Riesenberger, project director
for the PM 5 rebuild at Mondi Štĕtí, made this
comment after the first year of operation of
the new components: "In spite of many parallel works-like changing the dryer hood, a
new press section, and foundation works-
the machine started up after all rebuild and
modernization actions according to schedule.
Concerning the new drive and the new lubrication technology, all our expectations have
been fulfilled."
SCOPE OF THE PROJECT
AS Drives carried out the engineering of
the drive and lubrication technology, as well
as the project and installation management.
Within this major project, almost all drive
points from the wet end to the reel have been
modernized.
For the drive of the dryer group, Mondi
again counted on direct drive technology
from AS Drives. The complete FlexoDirect
(Fig. 1) is developed and produced in
Germany at AS Drives, and has been proven
in paper machine installations since 2010.
Altogether, 26 hollow shaft direct drives were
delivered for the Štĕtí project for the drive of
the dryer groups.
Next to 11 standard drives, AS Drives also
delivered two fully-automated Cooliflex

cooling aggregates, as well as 26 FlexoFlow
Water intelligent flow controllers. With the
Cooliflex and the FlexoFlow Water, an optimal temperature-management of the drives,
even within the dryer group, is provided at
all times.
In addition to the drive technology, AS
Drives modernized the lubrication technology in the complete dryer section of the PM
5. Through the redesign of the framing-parts,
the mill could completely dispense of oil
within the gearbox.
DRYER GROUP DRIVE
BEFORE MODERNIZATION
Before the rebuild at Mondi Štĕtí, the dryer
groups of the PM 5 were driven through a
closed gearbox (Fig. 2 and Fig. 3) The necessity to charge the mechanic coupling point
with fresh oil makes a gearbox difficult to
manage with regard to leakages. This is a
critical disadvantage, and not up-to-date with
current drive technology.
The Štĕtí project demonstrates how an
older gearbox drive can be modernized in
an economical and sustainable way. The
gearbox housing remains, as a carrying
part of the machine frame. The expansion
of gearwheels within the gearbox and the
consequent elimination of the mechanical
torque converter increase running smoothness and efficiency (Fig. 4). The old drive
motors, including their pre-gearboxes, have
been removed completely.
After the rebuild, only the roller bearings
of the cylinder in the dryer group need to be
supplied with fresh oil. The old gearbox drive
was dried up.
INNOVATIVE DIRECT DRIVE
FOR ALL DRYER GROUPS
In parallel with the dismantling of the old
gearbox drive, the new FlexoDirect drive system was installed. During the Mondi Štĕtí
project, the direct drive comes into operation
for the drive of the dryer groups. This hollow
shaft drive is installed directly to the cylinder
www.tappi.org


http://www.tappi.org

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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