Mixer

A mixer comprising:

• a housing defining a mixing chamber for receiving components to be mixed;
• at least two rotors rotatably mounted by the housing within the mixing chamber;
• each of said rotors including an elongated shaft portion and a mixing element that is wound about the shaft portion in an axially spiraling manner so as to define radial lobes;
• said mixing elements being spaced from the associated shaft portions at the radial lobes so that the components being mixed can pass therethrough;
• the elements of the rotors being wound in the same direction with the same pitch and being arranged in a meshing relationship with each other;
• the lobes of the mixing elements having inner ends secured to the associated shaft portions and curved shapes extending radially between the inner ends thereof;
• each mixing element being secured to the associated shaft portion at the inner ends of the radial lobes for at least three times for each revolution thereabout;
• and drive means for rotating the rotors in the same direction at the same speed about their elongated shaft portions so the rotor elements thereof mesh with the radial lobes of each passing between those of the other to provide the mixing of components received within the mixing chamber into a homogeneous mixture.