PUBLISHED: 21 May 10
Rosendahl’s RX45 crosshead
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.
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