Investigation of a High-speed Extruder with a Helically Grooved Melting Zone
Rising requirements regarding throughput rates of modern extrusion processes have led to a high demand of high-speed single-screw extruders. However, small screw diameters in combination with high screw speeds lead to difficulties in throughput stability, melt homogeneity and temperature rises. In this study the use of a helically grooved melting zone in combination with a 35 mm barrier screw was investigated, using four different types of polyolefines. At screw speeds up to 1250 rpm, stable throughputs of several hundred kg/h were achieved. For low-viscous materials with a low melting point the melt homogeneity was good and the mass temperature stayed within an acceptable range. For higher-viscous materials the melting point is crucial and influences the occurrence of dissipative heating or an insufficient melting performance due to short residence times. Thus, the screw design has to be adapted for different materials, varying the level of shear stress.
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The Journal of Plastics Technology is a peer reviewed internet periodical published under the auspices of the Scientific Alliance of Polymer Technology (WAK)
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