2008-07-29 Manufacturing News

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Innovative extrusion solutions for special rubber applications

Hot feed extruders integrated into Multiplex extrusion lines are particularly suited for processing rubber compounds.

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KraussMaffei Berstorff supports these efforts by continuously improving its Multiplex extrusion lines to allow the processing of newly developed compounds or to meet the ever more exacting requirements in terms of profile geometry precision. The hot-feed extruders integrated into Multiplex extrusion lines are particularly suited for processing rubber compounds with a high natural rubber share at high output rates, outstanding process stability and minor output pulsations. The optimised feed section with separately driven feed roll ensures smooth intake of the preheated rubber strip. Uniform rubber feeding combined with tailored screw geometries guarantees a constantly high filling level, thus ensuring maximum output rates and pulsation-free operation.

Hot-feed rubber processing extruders are particularly suited for compounds with a high natural rubber share. View High resolution image. photo: KraussMaffei

The KraussMaffei Berstorff product portfolio comprises eight different extruder sizes designed for the most diverse process tasks with screw diameters ranging between 60 and 350 mm and maximum output rates of 120 to 7000 kg per hour.

Perfectly adapted material feeding
KraussMaffei Berstorff has integrated a special loop system into the Multiplex extrusion line control solution to perform two different tasks: on the one hand, this system comprises a material accumulator to ensure uniform material feeding from the preheating unit to the extruder. Material variations in the preheating section or screw speed changes caused by modified profile dimensions or compounds are automatically compensated. On the other hand, the loop system allows the cooling section and thus the stock temperature to be modified – if this is required for process-engineering reasons – in order to obtain improved rubber homogeneity during the extrusion process.

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