In Europe environment-friendly blowing agents like CO_2 and others have been in use for several years. For such blowing agents a special injection technology and extrusion system is needed. A tandem-line consisting of a twin-screw extruder as a primary extruder in combination with a single screw extruder as a secondary extruder for cooling is the best solution. With the twin screw technology up to three different blowing agents and polymers with different melt flow indices and additives can be mixed in one stage. For the cooling of this "blowing agent containing melt" a large single screw extruder is the best choice.
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