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01 Dec 2015 
In single-screw extrusion, bettering economic efficiency is important for extrusion companies, in fact it is among the major production objectives for machine suppliers also. High economic productivity is achieved by low specific expenditure costs ?i.e. linked to melt throughput ?and low operating costs. Maximum melt throughput with good melt quality for confirmed machine size, in addition to the ability to procedure a wide range of recycleables with the same screw, are factors which contribute to the overall economy of a machine. Different important factors include low energy usage and zero-maintenance costs.

Innovative developments also make a contribution to greater economy on single-screw extrusion. Against this background, this content presents a range of extruder parts and process controls which enable the melt throughput to be increased for an array of thermoplastics and in addition ensure good melt top quality. It covers, on the main one hand, the chance of increasing the melt throughput of polyolefins through a substantial surge in the screw speed and, on the various other, raising the melt throughput of engineering thermoplastics by processing them on a grooved barrel extruder. The trials were extrusion company completed on a grooved barrel extruder especially built for these lab tests.

The design of the screw is explained in more detail in another article being presented at this conference. Two elements of particular importance in connection with the trials completed here are the large melting ability of the barrier section, and the consistent execution of the theory of a well balanced axial pressure account with low pressure towards the end of the grooved feed section, that is achieved by a higher conveying proficiency of the next barrier section and homogenizing elements. For optimum materials feed, the machine has an asymmetrical feed starting with a feed pocket. The purpose of this screw style was to create it suitable for processing a wide spectral range of thermoplastics over a broad speed range. Table 1 shows the technical info of the test extruder.

With single-screw extruders of a given screw size, the melt throughput could be increased both by raising the precise through ghput per revolution and by increasing the screw swiftness. The torque which can be transmitted at the end of the screw, and the melting ability, however, limit the maximum specific throughput. The figures distributed by many extruder producers are nowadays pretty much the same, and only small increases in specific throughputs should be expected nowadays.
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