Comparison of Ring Die Pellet Mill Machine and Flat Die Pellet Mill Machine

Flat die vs ring die pellet mill, which is better?

The pellet mill machine is an important granulating equipment in the granule production industry in today's society. It is used to develop wet powder into desired granules, and can also pulverize block dry materials into desired granules. It is widely used in feed, fertilizer, energy, chemical and other industries.

The pellet machine is divided into two series according to the mold: ring die pellet machine and flat die pellet machine. Due to the numerous brands of pellet mills in the market, many pellet manufacturers do not know whether to choose a ring die pellet machine or a flat die pellet mill when selecting a model.

Actually, there are many differences between flat die granulator and ring die granulator. Customers must figure out before purchasing: what is a flat die granulator? What is a ring die pellet machine? What is the difference between the two? Which pellet machine is suitable for you to buy？ The following will introduce the difference between flat die and ring die in detail.

In general, the pellet output of the ring die pellet mill machine is higher than that of the flat die pellet machine. The material of the ring die pellet machine is vertically fed into the pelletizing bin, the roller assembly rotates 360 degrees, and the finished pellets are extruded. In general, the output of this machine is quite considerable, and it runs stably for a long time.

Consult Pellet MachineCost Online

Actually, can we chang this question to "Which is more suitable for me?"

Ring die pellet mill has a unique design and reasonable structure, suitable for pressing various feed, sawdust, branches, bark, domestic waste, straw and other materials. The ring die pellet mill is especially advantageous in pressing feed pellets, with large output and low power consumption, which is incomparable to the flat die pellet machine.

The output of the flat die pellet mill is smaller than that of the ring die pellet machine due to its lower rotational speed than that of the ring die pellet machine. However, due to its excessive pressure, the density of the pressed concentrate is very high. So in this regard, the ring die pellet mill is far ahead.

In addition, even in the field of biomass pellets, wood pellets, organic fertilizers and cat litter, well-known pellet mill manufacturers (such as CPM) all use ring die pellet granulators, especially horizontal ring die granulators machine.

It can be said that if it is for household use and the quality of pellets is not high, we agree and encourage you to buy a flat die pellet mill granulator, because you can achieve what you want at a lower cost, especially It is also not easy for some farmers with small farms to invest in a flat die pellet machine.

However, if you have requirements on the quality of pellets (for example, feed pellets, the return rate of pellets produced by ring die pellet mills is too high), no matter what kind of pellets it is, if it meets the usage standards of ring die pellet machines (The feed category is greater than 1t/h, and the sawdust category is greater than 300kg/h), then we definitely recommend that you use a ring die pelletizer, especially if you want to build a pellet production line for commercial purposes.

Actually, frankly speaking, for the customers of large-volume feed mills and pellet mills, it does not involve the comparison of ring-die pellet mills and flat-die pellet mills at all; generally, such problems come from small output. customers, as these two pellet mill equipment have some similarities in small volume applications, but please keep in mind that the choice of the customer ultimately depends on which grade of pellets you want to produce.

1. Price: The ring die pellet mill price is definitely higher than that of the flat die pellet machine, because the technical content is higher, it is more durable, and the quality of the pellets produced is also better;
2. Production: The current output of flat die granulator per hour is from 80kg to 1000kg, which cannot reach a larger output. Even if some manufacturers say that their flat die granulator can achieve higher output, but the truth is that such a device is not stable. The final trend in the pellet processing industry is the ring die pelletizer. The minimum output of the ring die pellet machine is 300 kg and the maximum can reach 20 tons, but in terms of stability, the current ring die pellet machine below 10t/h has higher stability.

RING DIE PELLET MILL

Working principle of ring die pellet mill

The ring die pellet mills were designed at around the 1930’s based on the design of ring die. The basic pelleting principle of the ring die pellet mill is a simple operation where feed mass is distributed over the inner surface of a rotating, perforated die ahead of each roll, which compress the feed mass and compress it into the die holes to form pellets.

ring die pellet mill

Advantage and disadvantages of ring die pellet mills are as following:

Ring die pellet mills generate less wear and tear because the inner and outer edges of the rollers traverse the same distance.

Ring die pellet mills are more energy efficient than that of the flat die pellet mills.

One problem of the ring die pellet mills is side slip. Side slip is one undisputable and unavoidable fact on ring die pellet mill. It refers to having feed mash squeezed out sidewise from the nip between the roller and dies, which can be minimized, depending on the die configuration. One way to do this is to counter bore or drill larger hole in the two outer rows of the die so as to reduce the friction caused in the holes.

In one word, the ring die pellet mills also can be used to produce fuel and feed pellets. However, compared with the flat die pellet mills, the ring die pellet mill machines are well known for their large capacity for pellet production. They are featured as large capacity, with nice pellet forming shape and high density and high energy consumption.

TECHNICAL PARAMETERS OF RING DIE WOOD PELLET MILL

TECHNICAL PARAMETERS OF RING DIE FEED PELLET MILL

FLAT DIE PELLET MILL

Working principle of flat die pellet mill

The flat die pellet mill was the first pellet mill design at the turn of the 20th century based on flat dies. Generally, there are two types of flat die pellet mills in the market, the rotating die type and the rotating roller type. The former one has a stationary roller with the rotating die while the latter has a stationary die with a rotating roller. Adopting vertical principle, the raw materials drops down by the its own weight into the pelletizing chamber where they are compressed between the rollers and die to form pellets by going through the die holes.

flat die pellet mill

Advantage and disadvantages of flat die pellet mills are as following:

Flat die pellet mills are small in size and light in weight because of the compacted structure design.

Flat die pellet mils are easier to be cleaned and maintained and cheaper because of the design of portable rollers and die.

Flat die pellet mils are more convenient for you to monitor the process of pelletizing by watching the pelletizing chamber which make the experiment of indeterminate materials for raw materials expansion easier.

The disadvantages of pellet mills are they are not suitable for large scale pellet production. And also the gap between the roller and the die is tricky which should be adjustable according to the species of the raw materials especially the hardness of the raw materials.

All in all, the flat die pellet mills are usually used to process materials with large adhesive force for both fuel pellets and feed pellets in small scale and medium scale pellet production. They are known for the features, such as, reliable operation, greater mobility, low noise, low energy consumption and relatively low productivity, comparing with ring die pellet mills.

TECHNICAL PARAMETERS OF FLAT DIE PELLET MILL MACHINE

The difference between the flat die pellet mill and the ring die pellet mill (technical design)

• Feeding method: The ring die pellet mill adopts mechanical forced feeding, high-speed rotation and centrifugal distribution into the granulation chamber, and the material is distributed by the scraper, and the feeding is uneven; the flat die pellet mill enters the pressing chamber vertically by the weight of the material itself. , can feed evenly.
• Pressure: In a mold with the same diameter, the diameter of the ring die pressing wheel is limited by the diameter of the ring die, and the pressure cannot be adjusted. When pressing coarse fiber materials such as sawdust and peanut skin, it is difficult to form under the pressure designed by the machine, even if the molding is overloaded, the machine wears a lot, the mold pressing wheel skin needs to be replaced in time, and the mold can only be used once, and the follow-up cost is very large;
  
  The flat die pellet mill machine adopts a complete steel structure The three conical pressure rollers have a large shaft in the middle, and a special heat-treated mold is installed below. The rotation of the mold drives the three pressure rollers above to rotate, the pressure is adjustable, the output is stable, the pellet density is large, and the front and back sides of the mold are can be used.
  
  In addition, the diameter of the flat die pressing wheel is not limited by the diameter of the die, and the space for the shaft can be enlarged. The large bearing is selected to enhance the bearing capacity of the pressing wheel, and the pressing force and extension of the pressing wheel are improved.
• Discharge method: The ring die belongs to high speed, and the breakage rate is high when the material is discharged; while the flat die belongs to low speed, and the breakage rate is low.
• Pressure wheel adjustment method: The ring die pellet mill granulator uses two screws on the eccentric wheel in the middle of the pressure wheel to adjust the pressure; the flat die granulator uses a threaded screw center adjustment mechanism, the top force is 100 tons, and the falling Smooth, soft touch and even pressure.

What's Pellet Mill Machine?

Pellet mill is professional pelletizing equipment for making pellets. It can generally be classified into flat die pellet mill and ring die pellet mill. Flat die pellet mill machines are suitable for small scale pellet production, pelletizing test run for a certain kind of raw material or home use.

Ring die pellet mills are more suitable for large pellet production and industrial use. Referring to ring die type pellet mill, the critical part is the ring die. The quality of ring die can greatly affects the pelleting process and the quality of final pellets. Besides, it is also one of the most easily wear parts.

When pelletizing with the pellet mill machine, the friction force between ring die and press rollers will generate high temperature and pressure, which can help soften the materials and extruded them through the holes on the ring die. By this way, loosen raw materials can be compressed into pellets with high density and uniform size.

The above is the difference between the ring die pellet mill equipment and the flat die pellet mill. The ring die pellet machine and the flat die pellet machine have their own strengths in the pellet industry. ), it is recommended to use a flat die granulator; if the compression ratio and appearance of the granulated product are required to be high, and the output is also large, it is better to use a ring die granulator.