EoW January 2010

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.

Rosendahl’s RX45 crosshead ▲ ▲

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 : office@rosendahlaustria.com Website : www.rosendahlaustria.com 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 : dofama-mj@163.com Website : www.jcdofama.com JCDOFAMA’s YQL series machine ▲ ▲

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EuroWire – January 2010