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2010
Series Differential Rewind Shaft
What
is a Differential Shaft?
Differences
in material thickness
and winding tension often arise when rewinding foils, laminates,
plastics and other materials. These variations can result in different
lengths and tension requirements when rewinding smaller rolls on the
same rewind shaft. After only a few winding rotations the centre of
some small rolls may be too tight while others may show sagging, making
the quality of the end product unacceptable.
By
maintaining proper tension on
all rolls throughout the winding operation, the web material does not
sag, stretch, or tear and, the rolls are wound uniformly. In order to
perform this function the centre shaft is required to rotate at a
higher rate then the friction rings. All of the cores are required to
slip continuously, however, some will slip more than others in order to
maintain the same tension. Control of the slippage and the web tension
is achieved by varying the air supply to the centre shaft, so a
constant air supply needs to be available, ideally between 20 and 60
psi (1 – 4 Bar). As the roll size increase during the winding
process the speed of the shaft needs to be decreased in order to
maintain the same over speed rate.
Rimors
Differential Range
Rimor’s
range of
Differential Rewind Shafts are designed to be easy to use and
relatively maintenance free, ensuring the highest winding quality, even
when rewinding very narrow rolls – down to 14 mm in width.
The Cores are gripped by friction rings which run on a central shaft
that is treated in order to provide a hard surface, with a relatively
low coefficient of friction, over which the friction rings can rotate.
The tension ranges of the shafts are varied by changing the expanding
strip material of the centre shaft which provides the slippage. By
designing the rings to slip internally, common issues have been
eliminated in comparison to other differential shafts.
•
NO core dust in the mechanisim.
•
Cores can be reused
•
Sideway slippage eliminated
•
Positive expansion and retraction to a consistent diameter
•
Duplex and multiple tension applications
•
High load carrying capacity
Shafts
can be linked to a Web
tension control system which can be supplied by Rimor. Click
here
to see our Web Tension Control systems.
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