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The nip angle is defined as the angle that is tangent to the roll surface at the points of contact between the rolls and the particle. It depends on the surface characteristics of the rolls. Usually, the nip angle is between 20° and 30° but in some large roll crushers it is up to 40°.

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Fig. 14 shows a schematic view of the geometry of a roll crusher breakage process (δ : nip angle, x g : roll gap, D: roll diameter). During the transportation of particles from the point of nipping (A) to the point of exit (B), the bed of particles is compressed from a thickness of D(1 − cos δ) + x g to x g. It appears reasonable to assume ...

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Chapter 6 Roll Crushers Sciencedirect . The nip angle is affected by the distance between the rolls the nip angle is defined as the angle that is tangent to the roll surface at the points of contact between the rolls and the particle it depends on the surface characteristics of the rolls usually the nip angle is between 20 and 30 but in some large roll crushers it is up to 40

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Figure 6.4 is a typical set-up where ores crushed in primary and secondary crushers are further reduced in size by a rough roll crusher in an open circuit followed by finer size reduction in a closed circuit by a roll crusher. Such circuits are chosen as the feed size to standard roll crushers …

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