EoW January 2010

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EuroWire – January 2010 65
Extruding – machinery & equipment
Crosshead
developments
The challenge in distributor design is to find the optimum dimensions to attain a
balanced flow at the exit. Rosendahl’s distributor design is said to ensure homogeneous
material flow, independent of the processed materials and output. Optimised material
flow provides high centricity and allows a reduction in average wall thickness, therefore
reducing manufacturing costs. Using the latest finite element simulation programmes,
Rosendahl conducts mechanical calculations and rheological analysis of its crosshead
series. Rosendahl’s crosshead series now includes a range of crossheads for cables up to
110mm in core diameter.
The simulation also enables analysis of pressure, temperature rise, velocity, stress and
strain rate distributions over the entire simulation domain. Especially when designing the
distributor, it is important to adapt the distributor’s channels to the flow path of the melt.
In order to offer a broad material spectra, Rosendahl partnered with university
institutes to research a wide range of materials for the cable industry, and now offers
a material database that includes standard as well as special material (such as foamed
material blends, LSOH or XLPE). Rosendahl’s ongoing communication with polymer
manufacturers guarantees up-to-date technology. As a supplier of extruders, crossheads
and of complete extrusion lines, Rosendahl understands the polymer extrusion process.
Integrated simulation results, together with experiential data, have facilitated the
optimisation of the head design and, ultimately, a higher quality of extrudate.
Rosendahl Maschinen GmbH – Austria Fax: +43 3113 5100 59
Email: Website:
Rosendahl’s RX45 crosshead ▲ ▲
Lead extruders
JCDOFAMA’s YQL series machine is
designed to continuously compound a lead
sheath over cable, or for vulcanizing rubber
pipe. The lead layer’s outer diameter can be
between 10mm and 150mm. The pressure
and temperature for extruding remain
constant, so the difference in the thickness
of the lead layer is controlled within a small
range.
Deyang JiechuangWire & Cable Machinery Co Ltd – China Fax: +86 838 2800877
Email: Website:
JCDOFAMA’s YQL series machine ▲ ▲