Roller Gap Adjustment for Pellet Mill
1.Excessively tight pellets with short length and loud knocking sounds
Phenomenon: Pellets are overly compact, dark glossy, and extremely short. The mill emits continuous "popping" noises as pellets strike the chamber shell.
Relation to roller gap: Caused by an excessively small roller gap. This thins the pre-compressed material layer, reducing die feed and slowing material propulsion. The thin layer increases compaction, causing high chamber temperature, rapid moisture evaporation, and delayed extrusion through die holes.
2. Loose pellets with poor gloss but normal length
Phenomenon: Pellets lack compactness, show no obvious carbonized film, have dull 光泽 (gloss), and may be crumbly, though length and discharge speed are acceptable.
Relation to roller gap: Caused by a moderately large roller gap. The thick pre-compressed layer disperses extrusion pressure in both directions, reducing effective force on the material and leading to loose compaction.
3. No pellet discharge with material buildup in the chamber
Phenomenon: The mill fails to produce pellets, with material accumulating instead of being extruded.
Relation to roller gap: Caused by an excessively large roller gap, which prevents the formation of a pre-compressed material layer, halting the extrusion process.
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