... joining circular tube, increasing travel, improving density.6.Ring die,vertical structure,good for cooling the pelletizing room ... distribute in the die’s inner surface.Normally ring-die pellet mill’s rollers are static, die ... to reach four-fold capacity. No flat die, ring die can do this.4. Macroporous die, ... adjusting the length of circular tube). Normally ring die pellet mill’s die is rotating,can ...