When should the pressure roller of a pellet mill be replaced? 1
The roller shell, a key part of the pellet mill in direct contact with raw materials, will reduce extrusion efficiency when worn or damaged. Replace it immediately if:
Severe wear of surface patterns: New shells have anti-slip patterns to boost friction and prevent slipping. Replace if patterns are worn flat (partially or fully), causing raw materials to slip on the roller, fail to feed into die holes, and leading to a sharp output drop.
Cracking/chipping: Hard impurities in materials or long-term overload may cause radial cracks or local chipping. This leads to uneven extrusion, producing loose/irregular pellets; cracked areas may also scratch the die, accelerating its wear. Replace at once.
Excessive diameter wear: Long-term use reduces the roller’s diameter. Replace the entire roller assembly if its diameter is 2-3mm smaller than new—this makes the roller-die gap unadjustable via bolts, causing pellet density to drop significantly.
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