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Pellet Mill Ring Die is the core of Pellet Machine

Ring die, namely the pelletizing mold, is the core of pellet mill or even the heart of a pellet plant. Ring die, the honeycomb prototype will greatly influence capacity of pellet mill and pellet quality, output and performance. According to statistics, ring die maintenance usually accounts for 25% of total maintenance expense for a complete pellet plant. Therefore, it is widely acknowledged that choosing the best ring dies is of paramount importantce in a bid to save investment and maximize output. Actually there are a variety of ring die molds which are riddled with distinguished quantity of pores. On most occasions, a small number of openings on the mold will lead to a higher output of pellets yet with a relatively lower hardness.

Ring Die

The number of pores also lies in requirements for different biomass material species due to the distinguished hardness and cohesiveness. As we have detailed compression ratio of die mold previously and we hereby will not pinpoint on it.

Link to the knowhow of compression ratio of die mold

Upon selection of ring dies,you ought to get to know some basic info about it. In the first place,ring die is usually formed in round or circle shape. Second, Die compression ratio should be made out according to material species. Third, die mold material shall be inquired to manufacturer to ensure the quality will be consistent. Fourth, how to install and disassemble ring die. At high spinning speed of ring die, squeezed column of material will be discharged and cut off by a cutter head mounted outside of pelleting chamber to ensure ring die will perform stably and constantly. The die should cooperate with press rollers as well. 

Ring die is normally made from carbon architectural steel, alloy framework steel or stainless steel and through machining, exploration, warmth treatment and other procedure, the raw materials are made into ring die. The roughness of the die hole also influences the top quality of the ring die. The die openings of ring die drilled by gun-drill will certainly be more smooth.
Ring Die Mold

Of course ring die will help you optimize operations within pellet plant, for exapmple, ring die pellet mills can just generate less deterioration. Under super high pressure due to powerful friction produced by the combination of ring die and press rollers squeezing raw material in-between, therefore, some necessary heat can be thereof supplied in the same process.
 

Reasonable maintenance can ensure stable production and prolong the service life of a ring die. It is recommended that the following routine maintenance work be carried out regularly:
1. For the sake of preventing acidic residue from blocking and corroding the die holes and to allow the die to start easily when put back into production, it is necessary to feed a non-corrosive oily mixture into the pellet mill to drive out the residues.
2. After being used for a period of time, the working surface of the ring die will become uneven and the material guide angle of the die hole will become flat because of abrasion. At this time, the bumps on the working surface must be ground smooth and the material guide angle must be re-chamfered. Necessary restoration is important for prolonging the working life of a ring die. Make sure the lowest point of the working surface is 2 mm higher than the lowest point of the grooves cut in the face after restoration, and there should still be enough space for roller adjustment.
If not, then it is time to discard the ring die.
3. If the ring die does not discharge material due to blockage, the ring die can be soaked or boiled in oil to soften the material and then the material can be pushed out of the holes when reusing. If the blockage still can not be eliminated, drill out the material with an electric hand drill and then clean the die with oily material mixed with fine sand.
4. The ring die should be laid in a cool, dry and clean place away from a corrosive medium. Mark the specification on it for easy management. The storing place must be humidity-proof to avoid corrosion and to ensure die performance and life time.

You should distinguish ring die for biomass pellets from the ones used for making animal feed
Speaking of the involvement of pellet mill and the history of development of pellet plants, ring die has long been used for animal feed plants even earlier than that of biomass pellet plants. But wood pellet mills producing biomass pellet fuel draw increasingly more attention worldwide and of course some ring die producers get involved in production of the mold but without awareness of techniques. Consequently, they just adhere to the manufacturing of animal feed pellet ring die and never stop until problems occur, such as low productivity, bad shaping result, serious harm to machine and highly cost. We should urgently warn that wood pellets remain harder and that more pressure will be generated in the process than that in a feed pellet.

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Ring die is an important part of the pellet mill, it is as important as the human heart. The quality of ring die influences machine's production per hour,power consumption and product quality seriously. only to choose a good ring die,can they ensure the pellet mill's normal and steady production.
 
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