PUBLISHED: 06 Jul 09
RX45 with a ROEX extruder
The challenge in distributor 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 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 (such as foamed material blends, LSOH or XLPE). Rosendahl’s ongoing communication with polymer manufacturers 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.
The integrated simulation results, together with the experiential data, have enabled optimisation of the head design and ultimately to achieve a high quality of extrudate.
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