... diameter: 2-15mm. Generally ring die pellet mill and two rollers flat die pellet mill can not bear engough pressure, pellets can ... static, die rotates, no centrifugal force,unevenly distributed material.Normally flat-die pellet mills rollers rotate to generate centrifugal force, but ... materials, can heighten the rollers and two-layer dies to reach four-fold capacity. No flat die, ring die can do this ...