Tissue360 - Spring/Summer 2018 - 32

The softwood/hardwood issue is a relatively new area for the RTF. "We don't know
yet if furnish has an effect on CD profile
or uniformity. This is in development,"
Parent states.
Other parameters such as stretch, moisture, and bulk will all affect runnability.
Parent turns his attention to stretch,
another vital parameter. "Tissue has a 20
times higher stretch than traditional paper
grades," Parent explains. "Low tensile, high
stretch, and stretch is the key in many converting issues, so we are focusing on uniform
stretch, finding the root causes of stretch
issues that will lead to performance issues."
PRODUCERS WANT THE SAME THINGS
Tissues producers are no different than other
paper producers when it comes to what they
want: high quality, no rejects, and the elimination of non-uniformity; everything related
to efficiency. Wrinkles, bagginess, and web
breaks are often at the origin of low efficiency.
Parent adds, "It's all related to the tissue itself,
not the machinery."
Often, the RTF sees problems the producer
did not know existed because the rolls were
rejected on the converting line. Sometimes,
Parent says, the tissue makers do not know
what they are looking for.
The equipment at the RTF is designed to
test and quantify the uniformity of the web,
especially CD tension profile. The web is gently deposited on a web tension beam made up
of the Teflon pads that rest on the load cells.
Measurement resolution (CD) is one inch.
Each load cell locally records the pressure
of the web, thereby generating the full width
CD tension profile.
Other equipment includes scanners
for moisture, caliper and basis weight.
An Instron tester helps evaluate strength
variations. A Tapio high-resolution tester
looks at fiber orientation in both cross and
machine direction.
Parent discusses some specific cases where
the RTF helped mills. One mill had bagginess
problems that led to speed limitations on
the converting line. The RTF team was able
to determine that it was due to misalignment between the yankee and the winder.
There was more pulp draw on one side of
the tissue machine than the other, making
the tissue baggy.
In another, corrugations in the reel were
caused by non-uniform bulk. Work was done
on the calender and stack rolls were reground.
32

Tissue360º SPRING/SUMMER 2018

Parent also presented some case studies
during his presentation at the 2017 TAPPI/
RISI Tissue Conference in Miami. In one
example, two rolls from the same parent
reel behaved differently during converting.
The RTF team looked at both CD and MD
variability. The rejected roll showed a nonuniform CD tension profile.
In another case study, Parent showed how
one mill had a non-uniform MD tensile across
the CD. Lower tensile at the back may lead
to more breaks and converting issues. It is
linked to CD basis weight profiles. Basis
weight decreases toward the back side could
explain the lower MD tensile.
THE DOORS ARE OPEN
Parent says the RTF is open to all. "We get a
lot of US customers," he adds. "It is mostly a
request type of operation.
"We offer customers the opportunity to
benchmark good rolls against bad ones, so

they can see the difference, how to solve
problems, and what a good roll should
look like."
The team is continually working on understanding the challenges of not only converting, but also tissue making overall, including
calendering and winding-any issue that
arises from non-uniformity.
Perhaps the conclusion to Parent's paper
in Miami also fits well here. With multiple
complex operations, tissue converting is often
the bottleneck in tissue production. There is
significant opportunity for improvement.
Web uniformity is critical. Non-uniform
tension causes bagginess. The RTF's strength
uniformity (m-factor) analysis provides
new insights that can help a mill improve
its efficiency.
There is an ongoing need to further understand the link between web uniformity and
converting efficiency. This is a current focus
of FPInnovations' research effort.
www.tappi.org


http://www.tappi.org

Table of Contents for the Digital Edition of Tissue360 - Spring/Summer 2018

Setpoint
Tissue Industry News
Welcome to Scappoose
Meeting the Challenge of e-Commerce
Tissue 2018 Comes to Appleton
Ensuring Rolls Run Right
Streamlining the Parent Roll Supply Chain
Gomà-Camps Creates an Edge, Again and Again
iT’s Tissue 2018 Set to Roll
Tissue360 - Spring/Summer 2018 - Intro
Tissue360 - Spring/Summer 2018 - cover1
Tissue360 - Spring/Summer 2018 - cover2
Tissue360 - Spring/Summer 2018 - 3
Tissue360 - Spring/Summer 2018 - 4
Tissue360 - Spring/Summer 2018 - 5
Tissue360 - Spring/Summer 2018 - Setpoint
Tissue360 - Spring/Summer 2018 - 7
Tissue360 - Spring/Summer 2018 - 8
Tissue360 - Spring/Summer 2018 - Tissue Industry News
Tissue360 - Spring/Summer 2018 - 10
Tissue360 - Spring/Summer 2018 - 11
Tissue360 - Spring/Summer 2018 - 12
Tissue360 - Spring/Summer 2018 - 13
Tissue360 - Spring/Summer 2018 - 14
Tissue360 - Spring/Summer 2018 - Welcome to Scappoose
Tissue360 - Spring/Summer 2018 - 16
Tissue360 - Spring/Summer 2018 - 17
Tissue360 - Spring/Summer 2018 - 18
Tissue360 - Spring/Summer 2018 - 19
Tissue360 - Spring/Summer 2018 - 20
Tissue360 - Spring/Summer 2018 - 21
Tissue360 - Spring/Summer 2018 - 22
Tissue360 - Spring/Summer 2018 - Meeting the Challenge of e-Commerce
Tissue360 - Spring/Summer 2018 - 24
Tissue360 - Spring/Summer 2018 - 25
Tissue360 - Spring/Summer 2018 - 26
Tissue360 - Spring/Summer 2018 - 27
Tissue360 - Spring/Summer 2018 - Tissue 2018 Comes to Appleton
Tissue360 - Spring/Summer 2018 - 29
Tissue360 - Spring/Summer 2018 - 30
Tissue360 - Spring/Summer 2018 - Ensuring Rolls Run Right
Tissue360 - Spring/Summer 2018 - 32
Tissue360 - Spring/Summer 2018 - 33
Tissue360 - Spring/Summer 2018 - 34
Tissue360 - Spring/Summer 2018 - Streamlining the Parent Roll Supply Chain
Tissue360 - Spring/Summer 2018 - 36
Tissue360 - Spring/Summer 2018 - 37
Tissue360 - Spring/Summer 2018 - 38
Tissue360 - Spring/Summer 2018 - Gomà-Camps Creates an Edge, Again and Again
Tissue360 - Spring/Summer 2018 - 40
Tissue360 - Spring/Summer 2018 - 41
Tissue360 - Spring/Summer 2018 - 42
Tissue360 - Spring/Summer 2018 - iT’s Tissue 2018 Set to Roll
Tissue360 - Spring/Summer 2018 - 44
Tissue360 - Spring/Summer 2018 - 45
Tissue360 - Spring/Summer 2018 - 46
Tissue360 - Spring/Summer 2018 - 47
Tissue360 - Spring/Summer 2018 - 48
Tissue360 - Spring/Summer 2018 - 49
Tissue360 - Spring/Summer 2018 - 50
Tissue360 - Spring/Summer 2018 - cover3
Tissue360 - Spring/Summer 2018 - cover4
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