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AssigneeKraussmaffei Extrusion GmbH
InventorsOtto Skrabala, Stephan Roider
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An extruder screw for plasticizing at least one plastic or plastic mixture, including a melting zone, a shaft zone and a mixing zone arranged between the melting zone and the shaft zone, wherein a conveying flight is formed in the melting zone and in the shaft zone, which extends helically along a longitudinal axis of the screw, wherein a conveying flight of the melting zone ends at an end of the melting zone towards the mixing zone and a conveying flight of the shaft zone begins at an end towards the mixing zone. A flight depth of the melting zone continuously decreases along the longitudinal axis of the screw to the mixing zone. Further, an extrusion device having the extruder screw and to a method for plasticizing at least one plastic or plastic mixture.
An extruder screw (1) for plasticizing at least one plastic or a plastic mixture, comprising a melting zone (2), a wave zone (3) having at least one conveying channel changing its depth in a wave-shaped manner in longitudinal direction, and a mixing zone (4) arranged between the melting zone (2) and the wave zone (3) in direct connection to the melting zone (2), wherein in the melting zone (2) and in the wave zone (3) a conveying flight (5, 6) is arranged, extending helically along a longitudinal axis of the screw, wherein a conveying flight (5) of the melting zone (2) ends at an end (7) of the melting zone (2) facing the mixing zone (4), and a conveying flight (6) of the wave zone (3) begins at an end (8) facing the mixing zone (4), and wherein a channel depth of the melting zone (2) increases continuously along the longitudinal axis of the screw towards the mixing zone (4).
Dependencies are inferred from the claim text.