Paper360 - September/October 2016 - 50

techlink | DRIVES Innovative Direct Drive in a Turnkey-rebuild Project RAMAZAN ATAMAN 50 At Mondi's Dynäs mill in Väja, Sweden, mechanical problems and high maintenance costs proved that the drive system on PM 6 needed a rebuild. Mondi Dynäs PM 6 produces sack kraft paper with basis weight ranges from 50-160 g/m2 and a web width of 6,500 mm. In 2014, the machine speed was 775 m/min. Before the rebuild, the dryer groups on PM 6 were driven by a closed wheel housing drive. This drive system consisted of a central DC drive, which ran a number of downstream intermediate and drive wheels via a drive pinion. The drive wheels themselves were connected to the cylinder journal and turned the dryer cylinder. The high number of tooth meshes between the wheels created enormous friction losses and high wearout, which meant very high maintenance expenses (Fig. 1). With a closed wheel housing drive, the mechanical drive system within the housing is influenced by high temperature fluctuation. The large number of coupling points and the contamination of the internal housing with oil makes the closed wheel housing drive difficult to manage concerning leakages. On PM 6, some groups of the dryer section were driven by a DRG-gearbox. This form-fit gear unit is driven by one central DC motor. This drive transfers motor torque via a pinion shaft to the intermediate gears and then to the drive wheels (Fig. 2). The DRG-gearbox system could not solve the problems with the leakages and stress, but only shift them. Furthermore, the massive DRG-gearbox housing hindered access to the cylinder bearings as well as to the machine frame. A changing of a cylinder bearing could not be handled in a day's shutdown. Fig. 1: A view inside the housing, with cog wheels. Fig. 2: The DRG-gearbox. THE REBUILD PROJECT Mondi Dynäs planned to replace the old mechanical and electrical drive and install a new drive designed for a higher maximum production speed of 1,100 m/min. This drive was also to be designed to reach a creping speed of 15 m/min without any problems. During the project, the susceptible DRGdrive, the old DC drives and the counter gearbox were uninstalled. The old, closed wheel housing drive was eliminated by dismantling the intermediate wheels. The housing of the Paper360º SEPTEMBER/OCTOBER 2016 old drive remained as a structural part of the machine frame. AS Drives & Services (AS) was responsible for the rebuild of the mechanical drive components. Nearly all drive points of the PM 6 were rebuilt or renewed, from the wet end to the reel. AS handled engineering for the rebuild as well as the project and assembly management. The scope of supply included 20 standard drives, which came into operation in the wire and press section, at the Clupak, and at the reel. For the dryer section, AS delivered its newly-developed hollow shaft motor, FlexoDirect, with permanent magnet technology. AS also supplied the necessary cooling system: a Cooliflex demand-driven cooling unit, plus 26 FlexoFlow water control devices to automatically control the flow of the cooling water in response to the motor temperature. "Overall, the project went very well," says Jukka Linnonmaa, operations manager at Mondi Dynäs. "We have had no mentionable safety incidents and the expected additional production level is even better than expected." The Mondi Dynäs turnkey project marked the first use of the FlexoDirect direct drive Fig. 3: Two FlexoDirect with steam heads on the driving side of PM 6. www.tappi.org http://www.tappi.org

Table of Contents for the Digital Edition of Paper360 - September/October 2016

Setpoint
Over the Wire
Agenda 2020 Launches ‘Roadmaps’ to Efficiency, Sustainability, and New Product Goals
RBI: Transforming to Meet the Industry’s Research Needs
Paper Schools: Forging the Future
PPI Top 100
RISI’s Latin American CEO of the Year
Automation Upgrade Helps Sappi Gratkorn Perform
Innovative Direct Drive in a Turnkey-rebuilt Project
Klingele Papierwerke Saves Money, ‘Foils’ Stickies
TAPPI Journal Summaries
Life Cycle of the US Paper Industry
TAPPI News
ASPI News
Index of Advertisers
Paper360 - September/October 2016 - bellyband1
Paper360 - September/October 2016 - bellyband2
Paper360 - September/October 2016 - cover1
Paper360 - September/October 2016 - cover2
Paper360 - September/October 2016 - 3
Paper360 - September/October 2016 - 4
Paper360 - September/October 2016 - 5
Paper360 - September/October 2016 - Setpoint
Paper360 - September/October 2016 - 7
Paper360 - September/October 2016 - Over the Wire
Paper360 - September/October 2016 - 9
Paper360 - September/October 2016 - 10
Paper360 - September/October 2016 - 11
Paper360 - September/October 2016 - 12
Paper360 - September/October 2016 - 13
Paper360 - September/October 2016 - Agenda 2020 Launches ‘Roadmaps’ to Efficiency, Sustainability, and New Product Goals
Paper360 - September/October 2016 - 15
Paper360 - September/October 2016 - 16
Paper360 - September/October 2016 - 17
Paper360 - September/October 2016 - 18
Paper360 - September/October 2016 - 19
Paper360 - September/October 2016 - RBI: Transforming to Meet the Industry’s Research Needs
Paper360 - September/October 2016 - 21
Paper360 - September/October 2016 - 22
Paper360 - September/October 2016 - 23
Paper360 - September/October 2016 - Paper Schools: Forging the Future
Paper360 - September/October 2016 - 25
Paper360 - September/October 2016 - 26
Paper360 - September/October 2016 - 27
Paper360 - September/October 2016 - 28
Paper360 - September/October 2016 - PPI Top 100
Paper360 - September/October 2016 - 30
Paper360 - September/October 2016 - 31
Paper360 - September/October 2016 - 32
Paper360 - September/October 2016 - 33
Paper360 - September/October 2016 - 34
Paper360 - September/October 2016 - 35
Paper360 - September/October 2016 - 36
Paper360 - September/October 2016 - 37
Paper360 - September/October 2016 - RISI’s Latin American CEO of the Year
Paper360 - September/October 2016 - 39
Paper360 - September/October 2016 - 40
Paper360 - September/October 2016 - 41
Paper360 - September/October 2016 - 42
Paper360 - September/October 2016 - 43
Paper360 - September/October 2016 - 44
Paper360 - September/October 2016 - 45
Paper360 - September/October 2016 - Automation Upgrade Helps Sappi Gratkorn Perform
Paper360 - September/October 2016 - 47
Paper360 - September/October 2016 - 48
Paper360 - September/October 2016 - 49
Paper360 - September/October 2016 - Innovative Direct Drive in a Turnkey-rebuilt Project
Paper360 - September/October 2016 - 51
Paper360 - September/October 2016 - 52
Paper360 - September/October 2016 - 53
Paper360 - September/October 2016 - Klingele Papierwerke Saves Money, ‘Foils’ Stickies
Paper360 - September/October 2016 - 55
Paper360 - September/October 2016 - 56
Paper360 - September/October 2016 - 57
Paper360 - September/October 2016 - TAPPI Journal Summaries
Paper360 - September/October 2016 - 59
Paper360 - September/October 2016 - 60
Paper360 - September/October 2016 - 61
Paper360 - September/October 2016 - Life Cycle of the US Paper Industry
Paper360 - September/October 2016 - 63
Paper360 - September/October 2016 - 64
Paper360 - September/October 2016 - 65
Paper360 - September/October 2016 - TAPPI News
Paper360 - September/October 2016 - 67
Paper360 - September/October 2016 - ASPI News
Paper360 - September/October 2016 - 69
Paper360 - September/October 2016 - Index of Advertisers
Paper360 - September/October 2016 - cover3
Paper360 - September/October 2016 - cover4
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