Ring Die

BY James Wang
Ring die is the vital component of pellet mill. It effects the electricity consumption, output and quality directly. According to statistics, the cost of wear and tear of ring dies usually counts for 25% of the plant's total maintenance expenses. So choosing the right ring dies is the key to save the cost and profit-making. The users can choose different pellet mill dies as needed. Generally speaking, when the ratio of the hole depth and diameter is small, the output is high but the hardness is low.

Ring die

When you are choosing ring dies, there is some basic information you should know. Firstly, the ring die has a wide cylindrical shape and is mounted vertically. Second, the pressure of ring die is restricted because in the same diameter mould, the pinch roller of ring die is limited by the mould diameter. Third, ring die pellet mill adopts machine forced feeding, materials enter the granulating chamber with high speed rotary and distribute through scraper to ensure feed evenly. For the reason that ring die belongs to high rotary speed, the materials percentage of damage is higher than flat die.

Ring die
Also there are advantages of using ring die in pellet mills factory. Such as, ring die pellet mills generate less wear and tear because the same distance with both the inner and outer edges of the roller. The Pelleting process brings extra friction, but this extra friction is a good element in the production of quality wood pellets for the additional heat. In addition, ring die pellet mills are also more energy efficient.

ring die pellet mills

However some shortcomings also exist in old type ring die:

Because of the advantages of ring die, ring die pellet mill have been adopted in pellet making business for years. In its early time, it is always used to making feed. And in recent years, wood pellet mill is getting more and more attention and there are many manufacturers involve in wood pellet mill making. However, they just simply follow the way in making feed pellet mill and then problems occur, such as low productivity, bad shaping result, serious damage of machine and highly cost. As we know, wood pellet is harder and need more pressure than feed pellet. The old mode in making feed pellet is no more suitable to high quality wood pellet producing.


type ring die

So as to meet the higher requirement on ring die, innovation started.

Now advanced ring die is made of excellent quality high-chromium stainless alloy steel forge piece, which are very strong and malleable. Through precision finishing and vacuum gas quenching process, the die is more wear-resisting, corrosion-proof, impact-against and has longer using life.

Additionally, the unique punching technology burnishes the die holes in a higher level. These factors have led to ring die pellet mills being adopted in most large scale pellet production lines nowadays.

More information about ring die and ring die pellet mill are available in the guidance of pellet machine for free.

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