Paper360 - January/February 2018 - 31

Appearance of fluid and
jellyroll smelt samples
(pink parts are smelt;
black parts are char)
after being cooled to
room temperature.

Handsheet results displayed a marked strength improvement for the
arabinoxylans-modified pulp, primarily for low refining levels.

xylan should be concentrated and adsorbed into the pulp using existing
equipment or a minimal number of new unit operations.
In this work, we explored the concept of size-exclusion membranefiltration to concentrate xylan that was extracted from corn stover in
mild alkaline conditions. We examined hollow-fiber and tangential-flow
filtration types and achieved a nearly two-fold increase in the xylan
concentration using the former with a 50 kDa molecular weight cut-off
(MWCO) membrane. Cassette-type tangential-flow filtration resulted
in slightly greater xylan concentration with the use of a 10 kDa MWCO
membrane. Hemicellulose extracts were then used as an additive during
kraft pulping of hybrid poplar to show that the xylan could be adsorbed
onto pulp fibers and retained even after washing.
Pulp tensile strength improved after xylan addition following refining. An average of 33 percent of the xylan added in this method was
retained, with xylan loading between 5 wt% and 20 wt%, compared with
the control pulp sample that did not have added xylan. These results
suggest potential for further exploration of biorefinery extracts use as
additive feedstock for pulping. The study, being an evaluation of the
proof-of-concept, aims to push research and optimization in this area
that will lend well to scale-up and commercialization.
This work benefits mills in demonstrating that adjunct hemicelluloses may be incorporated into their pulp products, and if obtained
from a low-cost source, could provide an increase in sellable pulp mass.
This work also underlines the importance of hemicellulose content on
pulp properties.
 OCTOBER
RECOVERY CYCLE
Formation mechanisms of " jellyroll"
smelt in kraft recovery boilers
Honghi Tran and Andrew K. Jones
Molten smelt normally flows smoothly down the smelt spout of a
recovery boiler like water, but at times it suddenly becomes sluggish and
forms a viscous blob on the spout trough that partially or completely
blocks the smelt flow. This form of smelt is commonly referred to as
"jellyroll" smelt. How such smelt forms has been a puzzle to boiler
operators and mill personnel for years.

Numerous mill observations and the results of a recent study performed on both smoothly flowing smelt and jellyroll smelt collected from
a recovery boiler suggest that that jellyroll smelt can form through three
main mechanisms: i) the freezing of the molten smelt, ii) the melting
of fallen deposits, and iii) the inclusion of a large amount of unburned
char in the molten smelt. These mechanisms are consistent with mill
experience that jellyroll smelt tends to form in older recovery boilers
burning liquor with low solids and low sulfidity.
This paper discusses the three mechanisms through which jellyroll
smelt forms and provides operating strategies for minimizing jellyroll
smelt formation.
PAPERMAKING
Effect of conductivity on paper and board machine
performance-a review and new experiences
Lebo Xu, Przemyslaw E. Pruszynski, and Peter W. Hart
The current trend to further reuse water within paper mills has
resulted in more accumulated salts, as reflected by increased conductivity values. Although conductivity measurement is widely used in paper
mills, its fundamental principles and interpretation are not often fully
understood. This keeps papermakers from reaching the full benefits of
using conductivity measurements to help manage the wet end chemistry
of paper or board machines. High and variable conductivity affects the
intrinsic properties of pulps, the performance of chemical additives,
and the interaction between them.

Other research appearing in TAPPI
Journal's September 2017 issue:
RECYCLING
Effect of surface treatment with biodegradable
materials on properties of linerboard made
from old corrugated containers (OCC)
Somayeh Heydari, Ahmad Reza Saraeyan
and Alireza Shakeri

Other research appearing in TAPPI
Journal's October 2017 issue:
BLEACHING
Techno-economic analysis of ECF bleaching and TCF
bleaching for a bleached eucalyptus kraft pulp mill
Tiago de Assis, Jordan Perrin, Hasan Jameel,
Richard Phillips, Dominique Lachenal,
Adrianna Kirkman, and Ronalds Gonzalez

Paper360º JANUARY/FEBRUARY 2018

31



Table of Contents for the Digital Edition of Paper360 - January/February 2018

Setpoint
Over the Wire
On the Journey to Injury-Free
2018 Outlook
Welcome to Scappoose
A Novel Synthetic Adsorbent for Pitch Control
TAPPI Journal Summaries
A New Resource for R&M Professionals
Reliability Interview: Steven Mjoen, Catalyst Paper
Leadership in Reliability & Maintenance
Global Trade and the Pulp and Paper Industry
TAPPI News
ASPI News
Advertisers’ Index
Paper360 - January/February 2018 - Intro
Paper360 - January/February 2018 - cover1
Paper360 - January/February 2018 - cover2
Paper360 - January/February 2018 - 3
Paper360 - January/February 2018 - 4
Paper360 - January/February 2018 - 5
Paper360 - January/February 2018 - Setpoint
Paper360 - January/February 2018 - 7
Paper360 - January/February 2018 - Over the Wire
Paper360 - January/February 2018 - 9
Paper360 - January/February 2018 - On the Journey to Injury-Free
Paper360 - January/February 2018 - 11
Paper360 - January/February 2018 - 12
Paper360 - January/February 2018 - 13
Paper360 - January/February 2018 - 2018 Outlook
Paper360 - January/February 2018 - 15
Paper360 - January/February 2018 - 16
Paper360 - January/February 2018 - 17
Paper360 - January/February 2018 - Welcome to Scappoose
Paper360 - January/February 2018 - 19
Paper360 - January/February 2018 - insert1
Paper360 - January/February 2018 - insert2
Paper360 - January/February 2018 - 20
Paper360 - January/February 2018 - 21
Paper360 - January/February 2018 - 22
Paper360 - January/February 2018 - 23
Paper360 - January/February 2018 - 24
Paper360 - January/February 2018 - 25
Paper360 - January/February 2018 - A Novel Synthetic Adsorbent for Pitch Control
Paper360 - January/February 2018 - 27
Paper360 - January/February 2018 - 28
Paper360 - January/February 2018 - 29
Paper360 - January/February 2018 - TAPPI Journal Summaries
Paper360 - January/February 2018 - 31
Paper360 - January/February 2018 - 32
Paper360 - January/February 2018 - Reliability Interview: Steven Mjoen, Catalyst Paper
Paper360 - January/February 2018 - Leadership in Reliability & Maintenance
Paper360 - January/February 2018 - insert3
Paper360 - January/February 2018 - insert4
Paper360 - January/February 2018 - 35
Paper360 - January/February 2018 - 36
Paper360 - January/February 2018 - Global Trade and the Pulp and Paper Industry
Paper360 - January/February 2018 - 38
Paper360 - January/February 2018 - 39
Paper360 - January/February 2018 - 40
Paper360 - January/February 2018 - 41
Paper360 - January/February 2018 - 42
Paper360 - January/February 2018 - TAPPI News
Paper360 - January/February 2018 - 44
Paper360 - January/February 2018 - ASPI News
Paper360 - January/February 2018 - Advertisers’ Index
Paper360 - January/February 2018 - cover3
Paper360 - January/February 2018 - cover4
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