Roller Shells of Pellet Mill

BY James Wang
You want to produce pellets by pellet mills, you may wonder How does pellet form its shape.

The Basic Theory

Inside the ring die of pellet mill, there is a single or double roller shells mounted on an eccentric, turn on a rotating shaft as friction develops. The mutual pressure between ring die and roller shells overcomes the resistance when feed is forced through the die holes in high speed so that dissections of finished pellets become tight layers of feed mixture. The die is driven by a motor and the roller shell turn only as feed between rolls and pellet press dies develops friction.

Basic Theory

Roller Shells

Because there is friction, so we can see roller shells operate in extremely harsh conditions. Massive forces are transferred from the die face through the bearings to the roll support shaft. The friction causes fatigue crack on the surface. During production, the fatigue crack occurs in a certain depth later, service life of the shell will be longer accordingly.

Pellet Mill

The life of roller shell is so critical for frequently changing roller shells will also damage the ring die. Which means the material of roller shell should also be got into consideration in purchasing pelleting equipments. Material of Chrome Steel Alloys is advisable for it has good property of fatigue resistance, which suits the requirement of operating in harsh environment.


A good roller shells is not only made of good material, but also match the excellent performance of its dies. Roll shells are available in several patterns, dimpled and fluted.

Different customers always has different requirement of patterns to select the correct design for their application. Want to learn more about roller shells or pellet mill, you can visit our website to get free guide.

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