Startup sequence for roller crusher

A method for starting a roller crusher having two generally parallel rolls arranged to rotate in opposite directions and separated by an adjustable gap, wherein the roller crusher further comprises a feeding arrangement for feeding material to be crushed to the rolls, the method comprising the following steps:

• a) setting a gap width between the rolls to a predefined value (x), where the predefined value (x) is greater than a production operating gap (X);
• b) running the feeding arrangement at a feed rate (r) which differs from a normal production feed rate (R), where the feed rate (r) is less than the normal production feed rate (R);
• c) rotating the rolls in opposite directions at a predetermined speed (s), where the predetermined speed (s) is greater than 0 rpm;
• d) setting parameters in steps a)-c) such that
• i. material to be crushed passes between the rolls along substantially an entire crushing length (L) of the rolls;
• and
• ii. no or substantially no specific crushing force (f) is exerted on the material by the rolls,
• e) when i) and ii) are achieved, increasing the feed rate (r) gradually until desired production para meters of the production feed rate (R) and the crushing force (f) are achieved.