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This method of feed will show a marked improvement over the full choke method, both from the standpoint of clean product and lower power consumption.
A crusher with a high choke-point incorporated in its design is not appreciably affected by choke feed.
When these crushers are fully buried, the choke-point throttles back the material so as to prevent overloading the lower part of the crushing chamber, and there is so little active crushing surface above the choke-point that very few fines are produced in this zone.
The facts outlined in the preceding paragraph apply to the action of the crusher on screened feed. We have stressed the desirability of screened feed for all reduction and fine-reduction crushers. If it should be necessary to feed unscreened material to such machines, they should never be choke-fed. The feed should be regulated by mechanical means to a point safely within the rated capacity of the rusher, so -that the chamber will lever be more than partially filled with material. It goes without saying hat even this expedient will not work , on damp, sticky material.
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