Paper360 - March/April 2018 - 61

in first loop process water. Evaluation of ink removal selectivity at
pre-flotation and post-flotation showed a significant improvement
in comparison with reference values.
During the trial, the mill could either produce pulp with lower ink
content and consequently higher brightness (50 ppm effective residual
ink concentration [ERIC] less, corresponding to a 1 brightness point
increase) for similar losses, or similar pulp quality with 1-2 percent
yield improvement, representing a huge cost reduction. The mill also
reported beneficial side effects, such as reduced deinking chemicals
consumption (soda, silicate, and bleaching agents) and better paper
machine runnability, especially in terms of stickies breaks.
Mills may be able to increase brightness or yield in their deinking
line using the process described in this study.

OTHER RESEARCH
APPEARING IN TAPPI JOURNAL'S
NOVEMBER 2017 ISSUE:
PAPER PROPERTIES
Innovative technology for making improved
paper from the poorest fibers
Marion Sterner and Mikael Magnusson

OTHER RESEARCH
APPEARING IN TAPPI JOURNAL'S
JANUARY 2018 ISSUE:
COATING FAILURE
Discrete element method to predict
coating failure mechanisms
Daniel H. Varney and Douglas W. Bousfield

Schematic of the mill trial, with only pulp flotation and
thickening represented.

JANUARY
SLOT DIE COATING
Slot die coating of nanocellulose on paperboard
Vinay Kumar, Douglas W. Bousfield, and Martti Toivakka
Constantly growing interest in nanocellulose use and applications
is pushing the scientific community to search for suitable production
and processing techniques. One example is use of nanocellulose as
a barrier material in packaging applications, which requires processing of nanocellulose into films and coatings. It is challenging to
coat nanocellulose suspensions using conventional pigment coating
techniques due to their yield stress behavior and very high viscosity,
even at low solids concentration.
This study demonstrates a novel roll-to-roll coating method of
nanocellulose on paperboard using slot die geometry. The rheology
of nanocellulose suspensions in pressure-driven flow is found to play
a critical role in enabling their coating using the said process. In this
work, the slot die is used in an unconventional manner: the shearing
and metering elements are combined to aid wet film formation and
application of nanocellulose suspension onto the paperboard. Barrier
performance of the nanocellulose coated paperboards against air,
water, heptane vapor, grease, and oils was found to be reasonable and
warrants further research on the subject.
The modified slot die coating method reported in this study could
be used for roll-to-roll coating of web materials with a large variety
of highly viscous materials such as cellulose nanofibers.

Experimental setup for roll-to-roll slot die coating of cellulose
nanofibers suspension.

BARRIER COATING
Contrasting underlying mechanisms of different barrier
coating types
Bryan Mcculloch, John Roper, and Kaitlin Rosen
Barrier coatings are used in applications including food packaging,
dry goods, and consumer products to prevent transport of different compounds either through or into paper and paperboard substrates. These
coatings are useful in packaging to contain active ingredients, such as
fragrances; or to protect contents from detrimental substances, such as
oxygen, water, grease, or other chemicals of concern. They also are used to
prevent visual changes or mechanical degradation that might occur if the
paper becomes saturated. The performance and underlying mechanism
depends on the barrier coating type and, in particular, on whether the
barrier coating is designed to prevent diffusive or capillary transport.
Estimates on the basis of fundamental transport phenomena and
data from a broad screening of different barrier materials can be used

Pathways for capillary failures for sized paper (left) and paper using a barrier
coating (right).

Paper360º MARCH/APRIL 2018

61



Table of Contents for the Digital Edition of Paper360 - March/April 2018

Setpoint
Over the Wire
The Importance of Safety Training
Data & Decision Making
RISI European CEO of the Year: DS Smith’s Miles Roberts
Buckman’s Junai Maharaj on ‘The Art of the Possible’
Fapajal Tissue: Old, New & Customer-Centric
Progroup Turns 25
PIMA, Paper360° Co-Host Executive Panel
Creating a Lignin Culture
Benefits of Drive-Through Design
Sustainability as Business Leverage
CIPTE Show Highlights Innovation and Sustainability
TAPPI Journal Summaries
Leadership in Maintenance: Where Do We Start?
As a New Reliability Engineer, Are you Confused About Your Role?
R&M Tips
Paper and Board Have Key Roles in the Future of Packaging
Global Paper and Paperboard Demand Growing Despite Declines in Graphic Paper
PPI Awards Showcase Industry Excellence
TAPPI News
ASPI News
Index of Advertisers
Paper360 - March/April 2018 - intro
Paper360 - March/April 2018 - ebelly1
Paper360 - March/April 2018 - ebelly2
Paper360 - March/April 2018 - cover1
Paper360 - March/April 2018 - cover2
Paper360 - March/April 2018 - 3
Paper360 - March/April 2018 - 4
Paper360 - March/April 2018 - 5
Paper360 - March/April 2018 - Setpoint
Paper360 - March/April 2018 - 7
Paper360 - March/April 2018 - 8
Paper360 - March/April 2018 - Over the Wire
Paper360 - March/April 2018 - 10
Paper360 - March/April 2018 - 11
Paper360 - March/April 2018 - The Importance of Safety Training
Paper360 - March/April 2018 - 13
Paper360 - March/April 2018 - Data & Decision Making
Paper360 - March/April 2018 - 15
Paper360 - March/April 2018 - 16
Paper360 - March/April 2018 - 17
Paper360 - March/April 2018 - 18
Paper360 - March/April 2018 - 19
Paper360 - March/April 2018 - 20
Paper360 - March/April 2018 - 21
Paper360 - March/April 2018 - 22
Paper360 - March/April 2018 - 23
Paper360 - March/April 2018 - 24
Paper360 - March/April 2018 - 25
Paper360 - March/April 2018 - 26
Paper360 - March/April 2018 - 27
Paper360 - March/April 2018 - 28
Paper360 - March/April 2018 - 29
Paper360 - March/April 2018 - 30
Paper360 - March/April 2018 - 31
Paper360 - March/April 2018 - RISI European CEO of the Year: DS Smith’s Miles Roberts
Paper360 - March/April 2018 - 33
Paper360 - March/April 2018 - 34
Paper360 - March/April 2018 - 35
Paper360 - March/April 2018 - Buckman’s Junai Maharaj on ‘The Art of the Possible’
Paper360 - March/April 2018 - 37
Paper360 - March/April 2018 - 38
Paper360 - March/April 2018 - 39
Paper360 - March/April 2018 - Fapajal Tissue: Old, New & Customer-Centric
Paper360 - March/April 2018 - 41
Paper360 - March/April 2018 - 42
Paper360 - March/April 2018 - 43
Paper360 - March/April 2018 - Progroup Turns 25
Paper360 - March/April 2018 - 45
Paper360 - March/April 2018 - 46
Paper360 - March/April 2018 - 47
Paper360 - March/April 2018 - PIMA, Paper360° Co-Host Executive Panel
Paper360 - March/April 2018 - 49
Paper360 - March/April 2018 - Creating a Lignin Culture
Paper360 - March/April 2018 - 51
Paper360 - March/April 2018 - 52
Paper360 - March/April 2018 - 53
Paper360 - March/April 2018 - Benefits of Drive-Through Design
Paper360 - March/April 2018 - 55
Paper360 - March/April 2018 - Sustainability as Business Leverage
Paper360 - March/April 2018 - 57
Paper360 - March/April 2018 - CIPTE Show Highlights Innovation and Sustainability
Paper360 - March/April 2018 - 59
Paper360 - March/April 2018 - TAPPI Journal Summaries
Paper360 - March/April 2018 - 61
Paper360 - March/April 2018 - 62
Paper360 - March/April 2018 - 63
Paper360 - March/April 2018 - 64
Paper360 - March/April 2018 - Leadership in Maintenance: Where Do We Start?
Paper360 - March/April 2018 - As a New Reliability Engineer, Are you Confused About Your Role?
Paper360 - March/April 2018 - R&M Tips
Paper360 - March/April 2018 - Paper and Board Have Key Roles in the Future of Packaging
Paper360 - March/April 2018 - 69
Paper360 - March/April 2018 - Global Paper and Paperboard Demand Growing Despite Declines in Graphic Paper
Paper360 - March/April 2018 - 71
Paper360 - March/April 2018 - PPI Awards Showcase Industry Excellence
Paper360 - March/April 2018 - 73
Paper360 - March/April 2018 - 74
Paper360 - March/April 2018 - 75
Paper360 - March/April 2018 - 76
Paper360 - March/April 2018 - 77
Paper360 - March/April 2018 - 78
Paper360 - March/April 2018 - TAPPI News
Paper360 - March/April 2018 - 80
Paper360 - March/April 2018 - ASPI News
Paper360 - March/April 2018 - Index of Advertisers
Paper360 - March/April 2018 - cover3
Paper360 - March/April 2018 - cover4
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