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speed of roll crusher

the single-roll crusher has a tip speed of 400-450 ftmin while the 6- x 7-ft teethed roll crusher has a normal, no-load, surfaces speed of just under 3500 ftmin. it can be readily appreciated that this high velocity induces an extremely violent crushing action, in conjunction with the 3- to 4-in. knobs which protrude from the roll surfaces

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