Paper360 - November/December 2017 - 42

techlink | INSIDE

ORG
W W W. TA P P I .

JOURNAL

TECHNIC
ING INDUSTR IES'
THE PAPER AND PACKAG

AL RESOUR CE

16 NO.8
AUGUST 2017 | VOL.

439

TISSUE

Visual discrimination of
the
hygiene tissue softness in
absence of haptic feedback
Jessica Carette, Pierre-Majo
and Sylvain Sénécal

rique Léger,

453

BIOENERGY

Operating parameters affecting
the thermal performance
of biomass boilers
Andy Jones,
Naz Orang, Honghi Tran,
and F. Donald McCabe

465

BIOENERGY

Drying characteristics
of biosludge from pulp and
paper mills
Geanna Hovey, D. Grant
and Honghi Tran

Allen,

477

PAPERMAKING

Modeling the influence of
forming fabric structure on
vacuum box dewatering
Björn Sjöstrand, Christophe
and Lars Nilsson

Barbier,

TJ SUMMARIES
The papers summarized here
are from the August 2017 issue of TAPPI
Journal. TAPPI Journal is an online publication of relevant and timely peer-reviewed
research delivered via email and free to all
TAPPI members. To receive TAPPI Journal,
join TAPPI at www.tappi.org.
TISSUE
Visual discrimination of hygiene
tissue softness in the absence of
haptic feedback
Jessica Carette, Pierre-Majorique Léger,
and Sylvain Sénécal

Oculometry and heat maps were used to discover
how much of the tissue image participants looked
at before determining softness.

Our perception of the softness of materials
is dominated by the subjective interpretation
of haptic stimuli-touch. Although softness is
defined by the way a material deforms when
force is applied, other sensorial inputs, such as
vision and hearing, can be used to complement
haptic feedback or when the material cannot
be touched.
42

Paper360º

Surface and bulk softness elements of
hygiene tissue can be assessed visually.
Softness is reported as the number one
desired quality of hygiene tissue. So, it is of
paramount importance to understand the
criteria a consumer uses to judge softness
visually. Consumers must rely on these other
non-tactile senses at point-of-purchase or in
e-commerce because they cannot interact with
a product to judge the softness.
This study proposes that a consumer can
accurately gauge softness by sight alone, and
that factors such as color tone, embossing,
and image quality all affect the perception of
softness. Stiffness and mechanical properties
of the sheet cannot be observed by eye and
can contribute to errors in visual judgment.
The researchers conducted an experiment
using a complete pair ratio (round-robin) type
comparison to evaluate the perceived softness of altered images of hygiene tissue with
unaltered images. Images of hygiene tissue
were altered to represent different lighting
conditions or product color and digital image
degradation. Our results suggest that yellow
hygiene tissue is perceived as less soft than
blue, and un-embossed tissue as less soft
than embossed tissue. Reducing the image
resolution to 10 percent of the original did not
negatively affect the perception of softness.
In product development, color and embossing pattern can be manipulated to influence
the consumer's perception of product softness.
Images displayed digitally can be optimized
in a similar manner.
BIOENERGY
Operating parameters affecting
the thermal performance of
biomass boilers
Naz Orang, Honghi Tran, Andy Jones,
and F. Donald Mccabe
Operating data of a bubbling fluidized bed
(BFB) boiler and three stoker grate (SG) biomass boilers from different pulp mills were
analyzed over a 2-year period. The results show
that in all cases, the thermal performance
decreases markedly from 5.5 to 4 lb steam/lb
dry biomass as the feedstock moisture content
increases from 40 to 60 percent. The BFB boiler
had better thermal performance, although it
operated in a higher moisture content range
compared with the SG boilers.

NOVEMBER/DECEMBER 2017

Thermal performance (TP) response contour for
changes in moisture content (MC) and (a) lower
furnace temperature, (b) total air flow, (c) ID fan
current, and (d) ID fan outlet temperature. The
contours show that regardless of y-axis variable,
TP decreases with increasing MC.

Multivariate analysis was also performed
on one of the SG boilers to determine operating parameters that affect thermal performance. The results show that furnace
temperature, oil flow rate, and induced
draft (ID) fan current positively correlate
with thermal performance, while the feedstock moisture content, total air flow, and
excess oxygen negatively correlate with thermal performance. This implies that when
making modifications to improve thermal
performance, it is important to consider correlations among various parameters. In some
cases, one positively correlated parameter
might cause an increase in a negatively correlated parameter. The net effect might be a
decrease in thermal performance.
This study demonstrates how mills can
find the most suitable way to optimize boiler
operation with minimal process upsets.
BIOENERGY
Drying characteristics of biosludge
from pulp and paper mills
Geanna Hovey, D. Grant Allen,
and Honghi Tran
Handling and disposal of biosludge has
been a persistent problem for many pulp
and paper mills primarily because of the
material's high moisture content and poor
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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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