Patent ID: 6962431

Claim:
An extruder mixer for plastified flowable material comprising: an elongated rotatable screw having an elongational mixing zone adapted to mix material flowing therethrough, the mixing zone having: a substantially axially disposed inlet channel in fluid communication with a substantially axially disposed outlet channel; both the inlet channel and the outlet channel being bounded on one side by a substantially axially disposed blocking wall which substantially prevents material from flowing therepast; a substantially axially disposed first intermediate channel disposed between the inlet and the outlet channels and in fluid communication therewith; a substantially axially disposed first cross-axial pump disposed between the inlet channel and the first intermediate channel, the first pump drawing the material from the inlet channel into the first intermediate channel; and a substantially axially disposed second cross-axial pump disposed between the first intermediate channel and the outlet channel, the second pump drawing the material out of the first intermediate channel into the outlet channel to deliver the plastified material out of the mixing zone.