EoW July 2009

technology news

Crosshead developments

The challenge in distrib- utor design is to find the optimum dimensions of the distributor to attain a balanced flow at the exit. Rosendahl’s distributor concept is said to guarantee homogeneous material flow – independent of the processed materials and independent of the output. This optimised material flow provides high centricity and allows a reduction in average

▲ ▲ RX45 with a ROEX extruder

wall thickness and therefore reduces the manufacturing costs. With the help of the latest finite element simulation programmes, Rosendahl conducts mechanical calculations and rheological analysis of its crosshead series. 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 data base that includes standard as well as special material Precimax Engineers Limited India has been engaged in the design, manufacture, supply, installation and commissioning of industrial metallurgical plants for heat treatment and surface coating of wires since 1963, and is very active in the Indian and overseas market. The company has supplied a number of wire galvanising furnaces, bell furnaces, patenting lines and stress relieving lines for heat treatment and surface coating of wire. At present, Precimax is supplying a complete galvanising line for wire to a Sri Lankan manufacturer. Precimax Engineers Ltd – India Fax : +91 22 275 44917 Website : www.precimaxonline.com Wire processing furnaces and lines

(such as foamed material blends, LSOH or XLPE). Rosendahl’s ongoing communication with polymer manufac- turers guarantees up-to-date technology. Rosendahl, as supplier of extruders, crossheads and of complete extrusion lines, is in a position to investigate and understand the polymer extrusion process. results, together with the experiential data, have enabled optimisation of the head design and ultimately to achieve a high quality of extrudate. Rosendahl Maschinen GmbH – Austria Fax : +43 3113 5100 59 Email : office@rosendahlaustria.com Website : www.rosendahlaustria.com New Italian products The integrated simulation OMR has recently increased its line of completely automatic winding machines for wires prior to braiding process. Design and engineering have brought innovative solutions that allow the versatility of different dimensions of bobbins together with the possibility of fastening the final head with the snap or clip system. OMR Srl – Italy Fax : +39 03536 0354 Email : info@omr-srl.com Website : www.omr-srl.com

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EuroWire – July 2009