In sugar production, sucrose is extracted from sugar beets. On arrival at the production plant, the sugar beet roots are washed and cut into thin strips. These are passed into a diffuser that soaks them in hot water to extract the sugar content. The diffuser separates the pulp from the liquid. The output liquid from the diffuser is called raw juice and is used to retrieve the sugar through evaporation. The exhausted beets (pulp) are still very wet, with small quantities of sugar remaining in the water inside them.
Screw press for pressing used beet
To retrieve sugar residue from the used beet, the pulp is placed in a screw press. The screw press is a slow-moving machine in which a conical screw rotates inside a perforated cylindrical filter. During the pressing phase, the pulp is pressed with increasing force against the metal filter in order to obtain as much juice as possible. The holes in the filter allow the water to drain out. The remaining water is collected and used as diffusion water while the remaining beet pulp is used as livestock feed.
In sugar production, Costacurta’s drilled plate (that forms the filter of the screw press) is a fundamental element of the machine. The plate must be sufficiently thick to resist pressure, and have different kinds of perforations (cylindrical, conical and step drilled) to allow filtration of the water and its separation from the solid pulp.
Distinctive characteristics of Costacurta’s drilled plate for screw presses are:
- High quality and precision of the drilling
- High quality of the material used