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The article describes the machines that make up the mill, in particular the purifier.
In the previous articles, we explained the grinding process (you can read about grinding here). We already talked about the rollermill (you can read about the rollermill here) and the plansichter (you can read about the plansichter here).
We have not discussed, however, about the products of grinding that need further processing. Purifiers process some intermediate fractions selected by the plansichters, which carry out a further selection on a particle size basis. The result is a flour particularly suitable for fresh pasta.
Cylindrical mills have adopted the purifiers since the second half of the nineteenth century. Those of that time were known as “semolina cleaners” and they worked in different ways.
Principles which will be developed in modern machines were defined only with the “marseillaise cleaner”. The machine was equipped with a fan, which invested the product, driving away lighter fractions, such as bran.
But it needed to work with the surface of the detachments exposed to the environment. The poor hygienic level led to the design of machines closed by a box above the trabatto, equipped with fan.
Therefore, we can trace back to the end of the 800 the birth of machines for the cleaning of the semolina based on the principles still of reference:
The purifiers receive the intermediate particle size fractions selected by plansichter. Therefore they are able to make a very accurate selection. The machines also select the flour according to their specific weight. This distinguishes between “clean” groats (the finished product), “dressed” groats (the product to be remilled) and bran.
Let’s see the main characteristics of the purifier:
The process carried out by the purifier in the mill can be summarized in 3 steps:
As for the company reality of Molitecnica Sud, the first purifier built in our factory dates back to 1990. Today we are able to design and build not only high-quality purifier entirely produced in Italy, but also complete mill suitable for every need.