Method for alternately sifting and blending powders in the same operation
OwnerSanyasi R. Kalidindiinventor
Life of this patent
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Abstract
A tumbler is mounted for rotation around a trunnion with a screen fixedly mounted to a portion of the trunnion residing within the tumbler. A multiple blade paddle is mounted to a shaft that is rotatably supported through the trunnion. The paddle blades are formed with angular edges. As the tumbler rotates and the paddle rotates, powder is repeatedly dropped onto the screen to be sifted with the aid of the paddle. Rotating the tumbler further drops unsifted portions of the powder from the screen to mix with additional powder in the tumbler body. Thus, sifting and blending of powders is accomplished in one single operation.
Claims9
A method for alternately sifting and blending powders in a single operation comprising the steps of:
- a. placing a powder batch to be sifted and blended into a closed rotatable tumbler having a screen fixedly mounted and an agitator movably mounted therein;
- b. rotating the tumbler to cause the powder batch to drop alternately between a top and a bottom of the tumbler;
- c. catching a portion of the powder on the screen as the powder is being dropped toward the bottom of the tumbler;
- and
- d. moving the agitator to spread the powder on the screen and promote sifting.
Dependencies are inferred from the claim text.