WCA May 2012

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Technologynews
Wire & Cable ASIA – May/June 2012 42
With Niehoff’s high-speed rotating
machines and numerous other
production equipment, application-spe-
cific lines can be configured to
manufacture all types of data and
special cables, including LAN cables in
all categories – current, under
development and future – with the
utmost precision.
In order to remain competitive, cable
manufacturers need quality production
equipment that saves energy and
reduces raw materials and
consumables consumption. The data
and special cable stranding technology
developed by Maschinenfabrik Niehoff
meets these requirements.
Niehoff has been building bunching and
stranding machines for the last 50
years. During this period, these
machines have undergone continuous
development resulting in the D series
double twist bunching machines.
The successful concept of the D series
bunchers is used as a basic platform for
the DSI type double twist stranding
machines.
The double twist stranding machines
DSI 631 and DSI 1001 are built for a
maximum strand diameter of 8mm and
15mm, respectively. Energy efficient
drives, wind tunnel optimised bow
profile, single-bow design and the use
of other energy-saving components
result in considerable operational
energy savings. Compared to
conventional stranding systems energy
savings of 20% to 30% can be
achieved under the same operating
conditions.
The machines built in left and
right-hand versions can be combined
with additional ancillary equipment like
tangential pay offs, double twist back
twist pay offs, longitudinal tape pay
offs, pre-twisters and diverse spooling
units to create stranding lines for
specific applications. For advanced
data cable applications a double twist
back twist pay off capable of
generating back twist ratios from
0%-100%, or even higher if required, is
available.
Optionally the double twist back twist
pay offs can be used to enable a triple
twist stranding process. In this
configuration the stranding speed and
therefore the production capacity can
be increased considerably and – as a
consequence – production costs can
be reduced further.
Depending on line configurations, up
to three foils can be applied in-line on
the cable under controlled film tension
(multi-taping). Because of the modular
concept, these lines can be adapted to
increasingly changing cable designs
and specifications.
A DSI 631 stranding machine is
capable of pairing insulated
conductors into UTP and FTP cables
Category 5e and 6 with a bow speed
of 4,200-4,800tpm. In case of the triple
twist process, line speeds up to
6,000tpm can be reached.
S/FTP cables Category 6 to 8e can be
paired with a bow speed of 3,200 to
3,500tpm (with film). Further
processing on a double twist stranding
machine type DSI 1001 or a double
twist bunching machine type D 1001
can be achieved with a bow speed of
2,500 to 3,000t/min (Cat. 5e and 6) or
2,000 to 2,500t/min (Cat. 6-7).
Maschinenfabrik Niehoff
GmbH & Co KG – Germany
Fax: +49 912 297 7155
Email:
Website:
▲ ▲ DSI 631 double twist stranding machine
Niehoff stranding
in high tech mode