Importance

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Abstract

Material mixing apparatus and methods wherein a barrel defines a mixing chamber, a pair of parallel mixing shafts extend within the barrel chamber and are driven in the same direction of rotation and at the same speed of rotation, mixing elements are on each of the shafts in radial interwiping relation, the barrel has a pair of radially separated, reduced cross-section, annular discharge chambers through which the shafts extend, and one of the discharge chambers has a radial discharge port interjacent its ends, the barrel has a cross-sectionally enlarged end pass chamber through which the shafts further extend at the ends of the discharge chambers, the end pass chamber being of such cross-sectional volume relative to the conveying capacity of the other discharge chamber, as to operate in a partially starved mode at substantially atmospheric pressure, radially aligned paddle portions are on each of the shafts in the end pass chamber, shaped to wipe one another and the end pass chamber wall, one of the shafts has flights pitched to advance material from the mixing chamber through one of the discharge chambers to the end pass chamber, and the other of the shafts has helical flights thereon pitched to advance material from the mixing chamber to the radial discharge port, and also has helical flights of opposing hand pitched to advance material from the paddle portions in the end pass chamber to the radial discharge port.

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First Claim