Paper360 - November/December 2017 - 17

PM 1 At-A-Glance
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Fabric width: 282 inches (716 mm)
Design speed: 3000 ft/min ( 914 m/min)
Design basis weight: 26 lbs/1000 sq.ft. (127 g/m2)
Basis weight range: 23 to 40 lbs (112 to 195 g/m2)

preparation, and Valmet project group's support. The delivered equipment was very well
organized, packaged, and documented. This
allowed the project team and contractors to
easily confirm that all equipment was on site
prior to the start of the assembly." He says the
Valmet press section footprint was an advantage
when fitting it into an existing machine. Only
one dryer can was removed.
Scott adds, "Our project team was committed
to the aspiration of a perfectly executed project and Valmet did not hesitate to commit the
resources required to support that aspiration.
Valmet has provided the resources needed at
each step during the project, including field
engineering services to study machine imbalance, and to collect field measurements for
equipment design."
FELTS MATCHED TO NIP DEWATERING
The new press section overcomes limitations
of the old press by increasing the sheet dryness
and saving drying energy, closing up the long
open draw to the dryer section, and providing
a stable center roll sheet release. The new press
consists of a three-nip configuration with a shoe
press in the third nip. This is Valmet's OptiPress
Center, which is a new name for SymPress B.
More than 80 OptiPress Center and SymPress
B deliveries have been made since 1996-more
than 30 of those on board machines. It's a wellproven workhorse.
The press section and matching SMO felt
designs give maximum nip dewatering by
expressing water from each nip, rather than
the felts carrying water to the uhle boxes. The
SeamMaster Open (SMO) felt designs have lower
overall caliper and are lighter overall compared
to conventional felt designs. The SMO felt
designs also have much shorter startup time,
to achieve quick and effective nip dewatering.
Clint Lipscomb, PM 1 production manager, says
they are very pleased with the felts' running performance. He says the original SMO press clothing designs at startup have not been changed.
The project team selected Valmet's new uhle
boxes with perforated covers rather than the
traditional slotted design, and a hard ceramic

Schematic
of Greif
Riverville's
PM 1
OptiPress
Center.

coating. They provide better felt dewatering at
lower vacuum levels and less drag and wear on
the felts, leading to longer felt life.
PRODUCTIVITY UP, ENERGY USE DOWN
Sheet dryness to the dryer section is much
improved-from 41 percent to 48 percent-
thereby saving a significant amount of drying energy. Specific energy consumption was
reduced by approximately 10 percent over the
whole mill and 25 percent on PM 1, based on
the lower evaporation load. This lowers the cost
of energy per ton of board produced.
Production speeds are up significantly from
2,350 ft/min (717 m/min) to 2,850 ft/min (870
m/min) on the 23# grade. Since the press startup,
the mill has set new production records-more
than 100 t/d better performance. Once the mill
has corrected a dryer felt roll imbalance problem,
the speed is expected to be 30 percent higher,
with a target of 3,150 ft/min (960 m/min).
The mill also targeted quality test improvements, and that has been achieved. With the
denser sheet, caliper has been lowered, and
that contributes to better runnability on high

speed corrugators. The target for higher tensile
strength has been met. Lipscomb adds, "We are
able to meet industry strength properties at
higher production rates than previous."
Both Scott and Heishman agree that the
new press has given the mill extra capability
for increased productivity-in fact, more than
expected. The mill can leverage this capability
by targeting improvements in other parts of
the machine, to improve efficiency and meet
customer needs. After the press installation,
Valmet UnoRun blow boxes, twin run blow
boxes, a new UnoRun section, and optimized
section transfers were added to the dryer section to stabilize the sheet at the higher speeds.
Further plans include solving the dryer
felt roll imbalance problems and adding a
Valmet steam profiler in the press section.
Valmet will supply a different felt yarn formulation to resist felt compaction at the higher
operating temperatures.
Mark Williamson is a journalist engineer
based in Ontario, Canada. Contact him at
mark_williamson@sympatico.ca.

A summary of the rebuild results.

Paper360ยบ NOVEMBER/DECEMBER 2017

17



Table of Contents for the Digital Edition of Paper360 - November/December 2017

Setpoint
Over the Wire
Rebuilds and Conversions
Proud to be a Papermaker
The New Cascades
Operational Data Helps Mills Meet Challenges
Papermaking Best Practices with Vacuum-Dewatering Systems: Part 2
TAPPI Library is an Industry Resource
Managing the Decline of Graphic Paper Demand
TAPPI Journal Summaries
2017 PPI Awards Finalists
TAPPI News
ASPI News
Index of Advertisers
Paper360 - November/December 2017 - Intro
Paper360 - November/December 2017 - cover1
Paper360 - November/December 2017 - cover2
Paper360 - November/December 2017 - 3
Paper360 - November/December 2017 - 4
Paper360 - November/December 2017 - 5
Paper360 - November/December 2017 - Setpoint
Paper360 - November/December 2017 - 7
Paper360 - November/December 2017 - Over the Wire
Paper360 - November/December 2017 - 9
Paper360 - November/December 2017 - 10
Paper360 - November/December 2017 - 11
Paper360 - November/December 2017 - Rebuilds and Conversions
Paper360 - November/December 2017 - 13
Paper360 - November/December 2017 - 14
Paper360 - November/December 2017 - 15
Paper360 - November/December 2017 - 16
Paper360 - November/December 2017 - 17
Paper360 - November/December 2017 - 18
Paper360 - November/December 2017 - 19
Paper360 - November/December 2017 - 20
Paper360 - November/December 2017 - 21
Paper360 - November/December 2017 - 22
Paper360 - November/December 2017 - 23
Paper360 - November/December 2017 - Proud to be a Papermaker
Paper360 - November/December 2017 - 25
Paper360 - November/December 2017 - 26
Paper360 - November/December 2017 - 27
Paper360 - November/December 2017 - 28
Paper360 - November/December 2017 - 29
Paper360 - November/December 2017 - The New Cascades
Paper360 - November/December 2017 - 31
Paper360 - November/December 2017 - 32
Paper360 - November/December 2017 - 33
Paper360 - November/December 2017 - Operational Data Helps Mills Meet Challenges
Paper360 - November/December 2017 - 35
Paper360 - November/December 2017 - 36
Paper360 - November/December 2017 - 37
Paper360 - November/December 2017 - Papermaking Best Practices with Vacuum-Dewatering Systems: Part 2
Paper360 - November/December 2017 - 39
Paper360 - November/December 2017 - Managing the Decline of Graphic Paper Demand
Paper360 - November/December 2017 - 41
Paper360 - November/December 2017 - TAPPI Journal Summaries
Paper360 - November/December 2017 - 43
Paper360 - November/December 2017 - 44
Paper360 - November/December 2017 - 45
Paper360 - November/December 2017 - 2017 PPI Awards Finalists
Paper360 - November/December 2017 - 47
Paper360 - November/December 2017 - TAPPI News
Paper360 - November/December 2017 - ASPI News
Paper360 - November/December 2017 - Index of Advertisers
Paper360 - November/December 2017 - cover3
Paper360 - November/December 2017 - cover4
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