Roll Crusher an overview ScienceDirect Topics. The capacity of the singleroll crushers is a function of the roll gap, the roll length, and the speed, and ranges from about 30 tons/h (27 metric tons/h) for a 24inchlong (61 cm) roll crushing to ¾ inch (2 cm), up to approximately 1500 tons/h (1360 metric tons/h) for an 84inchlong (213 cm) roll crushing to pass 10 inches (25 cm).