Extruder screw, extrusion device with extruder screw and method for plasticizing a plastic material
AssigneeKraussmaffei Extrusion GmbH
InventorsOtto Skrabala, Stephan Roider
Life of this patent
Estimating the term…
Abstract
An extruder screw for the plasticizing of at least one plastic material or a plastic material mixture, with a melting zone, a wave zone and a mixing zone arranged between the melting zone and the wave zone, wherein a conveying web extending in a helix-like manner along a screw longitudinal axis is formed in the melting zone and in the wave zone, wherein a conveying web of the melting zone terminates at an end of the melting zone facing the mixing zone, and a conveying web of the wave zone begins at an end facing the mixing zone. The application also relates to an extrusion device with this extruder screw, and a method for plasticizing at least one plastic material or a plastic material mixture.
Claims15
An extruder screw (1) for use with an extrusion device having an inlet and an outlet, the extruder screw for the plasticizing of at least one plastic material or a plastic material mixture, the extruder screw (1) comprising a melting zone (2), a wave zone (3) and a mixing zone (4) arranged between the melting zone (2) and the wave zone (3), the mixing zone (2) in direct connection to the melting zone (2), wherein the melting zone (2) extends from said inlet of said extrusion device and terminates at the mixing zone (4), wherein a flight depth of the melting zone (2) decreases continuously in the extrusion direction along a longitudinal axis of the screw towards the mixing zone (4) and a conveying web (5, 6) extending in a helix-like manner along the longitudinal axis of the screw is formed in the melting zone (2) and in the wave zone (3), wherein a conveying web (5) of the melting zone (2) terminates at an end (7) of the melting zone (2) facing the mixing zone (4), and the conveying web (6) of the wave zone (3) begins at an end (8) facing the mixing zone (4).
An extruder screw (1) for use with an extrusion device having an inlet and an outlet, the extruder screw for the plasticizing of a least one plastic material or a plastic material mixture, the extruder screw (1) comprising a melting zone (2), a wave zone (3) and a mixing zone (4) arranged between the melting zone (2) and the wave zone (3), wherein the three zones (2, 3, 4) have respectively a conveying web (5, 6, 20) extending in a helix-like manner along a screw longitudinal axis, and a web pitch of a conveying web (20) running in the mixing zone (4) is smaller than or equal in size to a web pitch of a conveying web (5) running in the melting zone (2), the melting zone beginning at said inlet of said extrusion device and terminating at the mixing zone (4), wherein the melting zone (2) is equipped with at least one conveying web (5, 22) extending in a helix-like manner along the screw longitudinal axis, which conveying web has a radial height decreasing continuously in the extrusion direction towards the mixing zone (4).
Dependencies are inferred from the claim text.