Patent ID: 8303160

Claim:
An apparatus for extruding thermoplastic material, comprising an extruder screw which is mounted in a housing, comprises a plasticizing section on the inlet side, a degasification section upstream of an outlet section, a flow arrester between the plasticizing section and the degasification section with a screw section with a counter-rotating delivery flight, and at least one flow channel bridging the flow arrester and containing a melt filter, wherein a sleeve, which encompasses the screw and is mounted in the housing in a rotationally fixed manner, is associated with the screw section that forms the flow arrester, and the screw in the screw section of the flow arrester has a smaller screw diameter in relation to the plasticizing section, and wherein the flow channel on the outlet side of the melt filter is connected by at least one return channel, with the counter-rotating delivery flight of the extruder screw on the inlet side via a radial opening of the sleeve.