Patent ID: 8882337

Claim:
A kneading rotor of an intermeshing type used in a closed kneading machine having a casing inside which a chamber is provided, comprising a rotor section which is provided in the chamber, wherein; the rotor section has a rotor section main body of a round cylindrical shape, and one long blade and two short blades provided on a surface of the rotor section main body; the length L 4 of the long blade in a direction of rotation of the rotor section is greater than one half of the total length L 5 of the rotor section main body in the direction of rotation, the ratio (L 1 /L 2 ) between the length L 1 of the long blade in an axial direction of the rotor section and the total length L 2 of the rotor section main body in the axial direction is equal to or greater than 0.6, and less than 1, and the ratio (x/L 2 ) between the distance x in the axial direction from one end of the long blade to an end of the rotor section main body and the total length L 2 of the rotor section main body in the axial direction is greater than 0, and equal to or less than 0.2, the two short blades are arranged in such a manner that, in a case where a pair of the rotor sections are arranged mutually in parallel inside the chamber of the closed kneading machine and are rotated in mutually opposite directions, the two short blades of one of the rotor sections alternately repeat an approaching action and a separating action, in the direction of rotation of the rotor section, with respect to the long blade of the other one of the rotor sections, and in the state of approach, the long blade of the other one of the rotor sections is sandwiched between the two short blades of the one of the rotor sections in the axial direction, and the long blade is arranged in such a manner that, in a case where a pair of the rotor sections are arranged mutually in parallel inside the chamber of the closed kneading machine and are rotated in mutually opposite directions, an end section on the rearward side in the direction of rotation of the rotor section, of the long blade of one of the rotor sections, and an end section on the forward side in the direction of rotation of the rotor section, of the long blade of the other one of the rotor sections, alternately repeat mutually an approaching action and a separating action, and in the state of approach, the end section on the forward side and the end section on the rearward side oppose each other in the direction of rotation of the rotor sections on a line which links the respective central axes of the pair of rotor sections, in one cross-section perpendicular to the axial direction.