Importance

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Abstract

The invention is for mixing at least one kind of an additive with a powdery or granular main material homogeneously so as to continuously supply the same quantitatively. A barrel comprises a front side cylindrical part, a trough part, and a rear side cylindrical part from the upstream side. A quantitative extruding zone comprises the front side cylindrical part and a quantitative extruding part having a full flight provided on the peripheral surface of the axis part of a screw, for quantitatively transporting a main material to the downstream side. A mixing zone comprises the trough part and a mixing part having an agitating blade formed zigzag on the axis part of the screw and a ribbon screw having a distance with respect to the peripheral surface of the axis part, for homogeneously dispersing additives added from additive supply openings in the main material. The scraping out zone comprises the rear side cylindrical part and a scraping out part having forward paddles and backward paddles formed alternately on the peripheral surface of the axis part of the screw, for discharging the mixture from a discharge opening.

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First Claim