Importance

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Abstract

A kneading apparatus for an elastomer has a casing with a pair of rotors mounted therein. The casing defines a rotor chamber having a cocoon shaped cross-section. The pair of rotors are rotatably disposed in the rotor chamber, and extend in parallel with each other. Each of the rotors is integrally provided with at least two continuous blades, the rotating blades define a space therebetween in which rubber-like material is introduced for kneading. Each of the blades is continuously provided along a length of the rotor, and each of the blades includes a first blade portion oriented in a first direction at axially one end portion of the rotor, and a second blade portion oriented in a second direction. The first blade portion is provided at rotationally advanced position, and the second blade portion is provided at rotationally rear position. A radial clearance portion between the inner surface of the rotor chamber and the end face of the second blade portion is larger than a radial clearance portion defined between the inner surface and the end face of the first blade portion.

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First Claim