| 摘要 |
To extract and measure out a product from a bulk stock and adding said product inside a hopper use is made of at least three perforated surfaces or plates superimposed on one another and in contact with one another so that the product to be extracted is trapped in the hole(s) in the center plate between the top plate and the bottom plate by a relative movement of the top plate in relation to the two other plates then stationary in relation to each other and the product so trapped in the hole(s) in the center plate is extracted to the outside by a relative movement of the center plate in relation to the top plate and the bottom plate, then stationary in relation to each other, or by a relative movement of the bottom plate in relation to the center plate and the top plate. The addition and mixing of the additive so extracted with a product contained in a hopper, which products may be a pigment and a plastic in granules in a hopper, is effected by making a cavity in the bulk of the product contained in the hopper in an area close to its delivery nozzle and by pouring through the bulk of said product, from one or several distributors controlled by the device fed by the hopper, the additive(s) into the cavity for mixing there, which avoids dirtying the whole of the hopper and makes better and more proportionally accurate mixing possible. The invention is particularly useful when small grain or powdered products have to be measured, as is particularly the case in the plastics processing industry.
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