Differences between flat-die pellet mill and ring die pellet mill

1. Feeding style: Ring die pellet mill adopt intimidating mechanical feeding style. Feedstock entered into the pelletizing room with high speed in the rotating centrifugal way. Feedstock is being distributed by the slicker to realize evenly feeding; and flat die pellet mill depends on its own weight dropping into the pelletizing chamber to realize well-distributed feeding. 
 

2. Pressure:  Diameter of roller is limited by the diameter of die in the condition of identical die diameter and the pressure is non-adjustable. When coarse fiber feedstock, sawdust and peanut shell is being pressed, it is impossible to make pellet by pellet mill,  the machine is work overload with high wear resistance. And roller belt needs to be replaced in time and the die can be used only one time which increases the subsequent cost. Flat die adopt complete steel frame with three cone rollers with big main axis in the center, and the die at the bottom with special heat treatment. Along with the rotating of the die, three rollers are driven to rotate by the die. Flat die has the features of adjustable pressure, high density of pellet, and both sides of the die could be used. Besides, diameter of roller is not restricted by diameter of die which could enlarge the inner space for bearing. Also, choosing big bearing means increase endurance capacity of roller, strengthening the roller pressure and prolonging service time of pellet mill. 


 

3. Ways of outlet: Ring die pellet mill is rotating with high speed, and broken ratio of outlet is high. While flat ring die belongs to low speed rotate with low broken ratio.
 

4. Adjustment of roller: ring die pellet mill use two screws on the eccentric gear which lie in the center of roller to adjust pressure. Flat die pellet mill adopt the way of adjusting screws in the center. It has the features of enduring hundreds tons of jacking pressure, stable falling down, gentle hitting, and evenly pressure. 

 

From above, we make a conclusion that concentrates feed which use corn and bean pulp as main materials which has highly cohesive feature is easy to pellet without too much pressure. So ring die pellet is an expert in the field of concentrates feed production. While for sawdust, straw, grass meal, waste tires etc, it’s difficult for feedstock with crude fiber to pellet. Flat die pellet mill is a good choice for high temperature pellet and municipal solid waste, sewage disposal, animal waste and other organic fertilizer to pellet. 

---------------------------------------------------------------------------------------------------------------------------------------