Internal mixer

An internal mixer, comprising:

• a mixing chamber enclosed by a housing;
• a feeding neck in which a ram is guided;
• a closable discharge door;
• a first rotor (FR) having a first rotor main body, a first rotor blade tip, and a first sub-region, the FR positioned in the mixing chamber and rotatable about a first longitudinal axis;
• and
• a second rotor (SR) having a second rotor main body, a second rotor blade tip, and a second sub-region, the SR positioned in the mixing chamber and rotatable about a second longitudinal axis,
• wherein the FR and the SR are arranged to mesh with one another during a first portion of a rotational revolution in a first interaction region defined by at least a portion of the second rotor blade tip and the first sub-region facing the second rotor blade tip during the first portion of the rotational revolution,
• wherein the first sub-region includes a first transition from the first main body radius of curvature to a first sub-region radius of curvature that is different from the first main body radius of curvature,
• wherein the first portion of the rotational revolution includes a first degree of rotation,
• wherein the first sub-region includes a first sub-region surface section and at the first degree of rotation the second rotor blade tip and the first sub-region surface section are separated from one another by a first range of varying distances,
• wherein the FR and the SR are arranged to mesh with one another during a second portion of a rotational revolution in a second interaction region defined by at least a portion of the first rotor blade tip and the second sub-region facing the first rotor blade tip during the second portion of the rotational revolution,
• wherein the second sub-region includes a second transition from the second main body radius of curvature to a second sub-region radius of curvature that is different from the second main body radius of curvature,
• wherein the second portion of the rotational revolution includes a second degree of rotation, and
• wherein the second sub-region includes a second sub-region surface section and at the second degree of rotation the first rotor blade tip and the second sub-region surface section are separated from one another by a second range of varying distances.

An internal mixer, comprising:

• a mixing chamber enclosed by a housing;
• a feeding neck in which a ram is guided;
• a closable discharge door;
• and
• an intermeshing rotor system, comprising a first rotor (FR) and a second rotor (SR), the FR rotatable about a first longitudinal axis and the SR rotatable about a second longitudinal axis, the FR and the SR each having a rotor main body having a main body radius of curvature on which at least one rotor blade having a blade tip is arranged,
• wherein the FR and the SR are arranged to mesh with one another during a portion of a rotational revolution in an interaction region defined by at least a portion of the rotor blade tip of the SR and a sub-region of the FR that is facing the rotor blade tip during the portion of the rotational revolution,
• wherein the FR sub-region includes a transition from the main body radius of curvature to a sub-region radius of curvature that is different from the main body radius of curvature, and
• wherein the main body radius of curvature has a first center point along the first longitudinal axis and the sub-region radius of curvature has a second center point that is offset from the first longitudinal axis.