Patent ID: 8172449
Filing Date: 2012-05-08
Classification: B29B,B29C,Y10T

Abstract:
1. A kneading screw for a twin screw extruder that causes a material to be kneaded to flow, and applies a shearing force to the material to be kneaded to obtain a kneaded material in a desired kneading condition, comprising: a kneading rotor segment aggregate including at least two kneading rotor segments for kneading the material to be kneaded, wherein each of the kneading rotor segments is coupled to each other side by side in an axial direction of the kneading screw, and includes at least one of a spiral kneading blade or a kneading blade extending in parallel with the axial direction; and wherein the kneading rotor segments adjacent to each other in the axial direction, and extending spirally in the same direction, are incorporated in the kneading screw such that top blade portions of the kneading blades of the respective adjacent ends of the adjacent kneading rotor segments are shifted in phase to each other in a range between 48 and 147 degrees to each other, and the kneading rotor segments have a structure such that a torque fluctuation width of a coupled rotational shaft is constrained to a value equal to or less than about 60% of the maximum value from the case where the top blade portions of the adjacent ends of the adjacent kneading rotor segments are equal in phase to each other.