Extrusion 8-2017

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79 Extrusion 8/2017
Davis-Standard, LLC
“The ironing roll
winder offers a solu-
tion to a common
problem while also
improving product
quality and profita-
bility,” said Danis
Roy, Davis-Standard’s Vice President of
Sales, Cast Film and Coating Systems.
“Current markets dictate processing of
these films at slower production speeds
and to limited diameters in order to pro-
duce defect-free wound rolls. We have
experienced excellent results with this
new winder in the field.”
Larger diameter master rolls significantly
improve subsequent processing efficien-
cy. A relatively small increase in diameter
can significantly increase the film length
on a roll. This reduces downtime in slitter
re-winding as well as batch process like
vacuum metallization. The downside of
winding larger roll diameters is the in-
creased risk of in-wound defects. The
variable geometry of the ironing roll en-
... modernizes High-Speed Winding
of Large Diameter Master Rolls
Davis-Standard introduces a new iron-
ing roll winder that supports markets for
larger diameter master rolls up to 1.2 m
(4 feet) in diameter on cast film lines up
to 6 m (20 feet) wide. This technology
can be used for many film types, but
Davis-Standard has found it to be most
beneficial for CPP and barrier films
where post wrap shrinkage occurs as a
result of the types of polymers used in
the film structures, or where blocking
can occur due to a soft sealant layer with
a high coefficient of friction (COF).
The winder incorporates programmable
tension control, pre-spreading onto the
winding roll, and servo-controlled web
entry of the film to influence leveling or
lay-flat of the film prior to the lay-on roll.
Roll hardness is improved with a more
precise loading force of the lay-on roll
against the winding roll, controlling the
in-wound air at higher production
speeds than previously possible. When
optimized these features can reduce de-
fects such as tin-canning, caused by
blocking and entrapped air, and resulting
in annular raised bands on the roll face.
Other defects such as buckling, telescop-
ing, and starring can also be reduced
with the control features and dynamics
of the new winding system.
New Ironing Roll Winder ...
ables processors to pre-wrap the film on-
to the winding roll prior to the lay-on
roll, allowing entrapped air to reduce the
COF between each wrap. This promotes
film flatness prior to engaging roll hard-
ness with the lay-on roll. This results in
improved control, preventing in-wound
imperfections. The winder is available
with a tapeless static knife or patented
stationary knife automatic transfer sys-
tems, and shafted or shaftless operation
to further support efficiency. Although
the winder is primarily designed for large
master roll winding, in-line slitting is also
possible in some shafted applications.
Davis-Standard’s
new ironing roll
winder helps
prevent in-wound
imperfections on
large diameter
master rolls for
films such as CPP
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