Patent ID: 8042987
Filing Date: 2011-10-25
Classification: B29B,B29C

Abstract:
1. A kneading extruder comprising: a cylinder capable of heating and cooling; and twin screws provided in the cylinder, the twin screws including in order from an upstream side thereof: a solid transporting portion; a plasticization kneading portion comprising; a first molten material transporting portion comprising a full flight screw configured to transport material in a downstream direction from a downstream end of the plasticization kneading portion to a discharge port, wherein the discharge port is axially aligned with the full flight screw; wherein: the twist kneading disks have a combined length in a longitudinal direction of the cylinder of more than 1.88 times an inner diameter D of the cylinder; the twist kneading disks comprise a plurality of disks, a length in the longitudinal direction of the cylinder of each disk being 0.1 to 0.5 times the inner diameter D of the cylinder; each twist kneading disk comprises a helix angle θ between a vertex of one surface side of the disk and a vertex of another surface side of the disk at a tip portion in a range of 0°<θ<90° in a reverse rotating direction of the screws, as viewed from a cross section of the disk having a normal line equivalent to a screw shaft in an end direction of the screw shaft; a phase angle E in correlation between the twist kneading disks around the screw shaft is in a range of 0°<E<90°; and a phase angle E between adjacent cross kneading disks is substantially 90°, and wherein a first vent is provided in the molten material transporting portion between a downstream end of the plasticization kneading portion and the discharge port.