Paper360 - July/August 2017 - 53

are known to prevent them from effective incorporation into other
polymeric materials, covalently or noncovalently. Therefore, this
review intends to summarize the methods that improve the reactivity
of lignin through chemical modification such as depolymerization,
demethylation, and chain extension. The authors examined future
developments and applications with a special emphasis on tailoring
lignin structure to specific applications.

Other research appearing

in TAPPI Journal's
April 2017 issue:
ECONOMIC ANALYSIS

PULPING
In-process detection of fiber cutting in low consistency
refining based on measurement of forces on refiner bars
R. Harirforoush, J. Olson, and P. Wild

Decision-making process for the identification of
preferred lignin-based biorefinery strategies
Cédric Diffo Téguia, Sophie D'Amours,
Rod Albers, and Paul Stuart
LIGNIN PYROLYSIS
Toward valorization of lignin: Characterization and
fast pyrolysis of lignin recovered from hot-water
extracts of electron-beam irradiated sugar maple
Derek Corbett, Ofei Mante, and Biljana Bujanovic

Other research appearing

in TAPPI Journal's
May 2017 issue:

(a) Refiner force sensor used;
(b) closeup of sensor installed in the stator;
(c) location of the sensor on the stator plate.

A major drawback of low consistency refining is the degradation of mechanical properties due to fiber cutting at high refining
energies. Conventional strategies to avoid fiber cutting are based on
post-refining measurement of pulp properties and, typically, this
does not enable rapid adjustment of refiner operation in response
to the onset of fiber cutting.
This study's objective is to detect the onset of fiber cutting with
custom-designed piezoelectric force sensors that measure shear and
normal forces applied to pulp fibers by the refiner bars. Researchers
performed trials in an AIKAWA/Advanced Fiber Technologies Inc.
16-in. single-disc low consistency refiner. The trials were run using
mechanical softwood SPF (spruce, pine, and fir) pulp with 378 ml
CSF at 2.5 percent and 3.5 percent consistency at rotational speeds of
800 rpm, 1000 rpm, and 1200 rpm. Distributions of the peak normal
and shear forces and peak coefficient of friction were determined
for each operating condition, and a two-parameter Weibull function
fit to each of these distributions. Researchers calculated the scale
parameter, one of the key parameters of the Weibull function, and
plotted length-weighted fiber length as a function of this parameter.
The results show that the onset of fiber cutting consistently
corresponds to a distinct transition in the plot of length-weighted
fiber length versus scale parameter. This transition is believed to
be caused by a fundamental transition in the fiber-bar interaction.
Moreover, frequency analysis of the sensor data shows the magnitude
of the dominant frequency remains relatively constant while the
plate gap is reduced, up to a threshold value, which corresponds
to the onset of fiber cutting. The results suggest that these sensors
have potential to be used for in-process detection of the onset of
fiber cutting.

BLEACHING
Generalized steady-state model for chlorine
dioxide brightening of hardwood kraft pulps
Brian N. Brogdon
PULPING
Impact of dissolved matter in the
oxygen delignification stage
Caroline Wilke, Niclas Andersson, and Ulf Germgård
MAY
BIOREFINERY
Process for producing acetic acid in hardwood
kraft pulp mills
Ravikant Patil, Joseph Genco, Hemant Pendse, and
Adriaan Van Heiningen
To determine the economic feasibility of producing acetic acid
from commercial hardwood chips in kraft pulp mills, researchers
conducted laboratory experiments to obtain data for a preliminary
economic analysis of an acetic acid recovery process. The acetyl groups
in northeast hardwood were hydrolyzed from the xylan polymers
in the wood to obtain sodium acetate, and extraction experiments
involved use of sodium hydroxide at low temperature. Sodium acetate
from the extract was concentrated and then converted into acetic
acid and sodium hydroxide by salt splitting using bipolar membrane
electrodialysis (BPMED). Researchers prepared flow diagrams and
Paper360º JULY/AUGUST 2017

53



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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