Ring die compression ratio of biomass pellet machine

The ring die compression ratio of biomass pellet machine is the ratio of the effective length and the minimum diameter of ring die hole, it is an indicator of the strength of pellet feed extrusion.
In different regions, the hardness of different materials are different. Thus, the clearance of the die should be adjusted in the operation of biomass pellet machine. There are a lot of compression ratio ranging between 35-75. The most commonly used compression ratio of die is 40.



While the compression ration for wood is 40 or 45, 50 or 55 for rice husk. The larger the compression ratio, the strong the pellet feed. For ring die compression ratio of straight shape hole, the effective length of ring die is the total thickness of ring die and the minimum diameter is the diameter of the die itself. For release type ladder hole and outer cone hole, the effective length of die hole is the total thickness of the ring die minus the length of release hole or the outer cone hole. The aperture of minor diameter is the aperture that calculates compression ratio of biomass pellet machine. For compression type ladder hole and inner cone hole, it is quite special. Generally, the entire ring die thickness is seen as the effective length of die hole, the aperture of the minor diameter is the minimum diameter. Of course, the meaning of the compression ratio of the ring die calculated in this way is different with the first two kinds.
 
The compression ratio of poplar is 1:6, compression ratio of pine is 1:7, 1:5 for hard wood, 1:5. 5 for broken wood shavings and 1:8 for maize straw. Through these data, we may draw the conclusion that the harder the raw material, the smaller the compression ratio; the more fluffy the raw material, the lager the compression ratio, that is to say, the more fluffy the material is, the easier the molding would be. Since fluffy material contains more fiber, fiber which is more easy for forming. In actual production, we would set the compression ration according to the actual situation of users or the ratio of raw materials to save the raw material and meet the needs of users. If users want to make straw pellets with biomass pellet machine, but the local wood price is too high, then a certain amount of wood chips can be mixed in the straw, so that it can reduce raw material products, and the finished pellets can meet the requirements of the heat of combustion.

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