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After grinding the grains, both in roller mills and in hammer mills, stone mills or other equipment, the product must undergo classification.
With the classification in mind this equipment was designed, as it can internally contain from 14 to 28 sieves and has an oscillating movement that, together with the presence of the product on the sieves, its generated forces and friction with direct influence on the dynamic balance of the plansifter, causes the product to be classified through its internal compartments.
Its internal axis is eccentric and responsible for the movement of the equipment, made from material with high mechanical resistance and very well dimensioned to withstand impacts generated by torsion and tension on the equipment. Its internal chambers have modular options to assist in application in the most diverse diagrams.
The plansifter sieves have varying mesh openings and are designed according to the diagram of the mill in question, the ground product will be classified and directed to subsequent locations, for example in wheat, the pure endosperm separated from the grains in T1 will already be directed to the flours, the semolina must be sent to the purifiers where it will be cleaned and also classified for further griding.
In this process to maintain hygiene, the sieves are manufactured with a special high quality wood and covered in formica, currently due to the growing concern with sanitary standards they can be supplied in uhmw or food-grade plastic material, they also have a beater who will be responsible for keeping the sieve operating area always available and clean.
To analyze the process, here are some factors that influence the flow of a plansifter:
We take into account that a product is well sifted when the product that enters has the same quantity as the product that leaves already classified, as this makes it possible to acquire a greater flow of product and consequently greater production capacities. The shape of the product is linked to ease of sifting, as products with more rounded corners and shapes are more likely to pass through the mesh of the screens chosen for physical reasons.
A product with a moisture content above that indicated, in addition to having greater difficulty in being sieved, can also directly influence the final flour yield of the process and the grinding capacity of the mill, which is why it is necessary to control its moisture, especially when we talk about wheat and corn, through equipment such as the intensive dampener with automatic addition of water and humidity control, the necessary safety for a well-executed classification and grinding is guaranteed.
As previously discussed, for optimal operation, in addition to controlling humidity, it is also convenient to control the temperature and relative humidity of the air in the environment by pressurizing it with systems that allow air to be insuflated, thus having total control over the system and production.
50 seconds worth it, watch the equipment in operation |
The useful surface is removing the space occupied on the screen by the loom, it has a high influence on the sifting of a plansichter (plansifter), today there are different models of sieves and a simple change of measurements can increase the sifting area, helping to further optimize the process.
Consequently, cleaning the sieves is an essential factor as it has a direct influence on the useful area of operation of the product, therefore, as already described, the boxes have internal beaters made of a special material to protect and ensure the duration of the screens, the beaters are responsible for cleaning and leaving the useful surface of the screens always active, thus maintaining the stable functioning of the equipment.
Other important factors since in the compartments, the higher the oscillation speed, the longer the product can remain in contact with the sieve, which ends up influencing its removal and classification, and to increase or decrease the classification time, it can vary the number of sieves in each compartment, also changing the particle size of the mesh, this process will be defined according to the layout of the mill and according to the needs of each operation and client.
In addition to the factors described, we can mention the properties of the product being processed, such as its specific mass, the feed that must be uniform and well distributed, up to the height between the screens to guarantee the continuous flow of the classified product.
The plansifter is actually a complex piece of equipment, but no one needs to know everything, if you are interested and want to know more about the equipment, get in touch with the Coppi team, our technicians will be waiting for you.
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