Rotary screen filters for the food industry: what they are and their function

Filtration systems find numerous applications within the Food & Beverage industrial chain.
For this reason, we want to focus on the rotary screen filters, understand what they are and what their function is within the food industry.

As we mentioned in the article dedicated to filters for Food & Beverage, the agri-food chain for the extraction and processing of starch from agricultural raw materials is one of the most important in the world.

Specifically, this supply chain uses corn, wheat, potatoes, tapioca and rice as raw materials to produce around 49 million tons of starch every year.

Let’s go into the details of the rotary screen filters used in the agro-food industry.

What are outgoing cloth filters for the food industry

What are the outgoing cloth filters used in the food industry?

In the previous paragraphs we said that the rotating cloth filters are used for processing grains, such as corn for example.

Essentially, these are systems designed for the separation of solids and of liquids in the filtration phase.

This type of filter is suitable for suspensions which after discharge make it necessary to wash the filter cloth.

In particular, continuous washing of the cloth is essential to ensure continuous operation and to prevent solids from clogging the filter medium.

In general, rotary screen filters consist of the following parts:

  • rotating drum
  • vacuum distribution system
  • basin
  • agitator
  • cake unloading device

What are cloth filters used for in the food industry

Within the agro-food chain, the outgoing cloth rotary filters have multiple applications.
For example, they can be used to derive numerous substances from corn filtration, including:

  • starch
  • yeast
  • ethanol
  • fructose
  • Palm oil
  • dextrose

Furthermore, the rotating cloth filters can also be used within the filtration process which allows to obtain the separation of the gluten contained in the corn.

Specifically, it is a wet milling process of corn.
In this case, centrifugal separators are used to separate the gluten from the starch.
By doing this, a thin gluten liquid with a density of 15-25 g/l is obtained. This, in turn, is thickened with the gluten thickener (GT) to obtain a thick gluten liquid of 80~110g/l density.
At this point, the thick gluten liquid is further dehydrated and dried to obtain the final commercial gluten powder.

In this article we have seen the outgoing cloth filters applied to the agri-food sector, but in general these filtering solutions can be used in multiple areas, such as:

  • chemical industry
  • food industry
  • ecological plants
  • ceramic industry
  • refinery ash
  • pharmaceutical industry
  • galvanic industries
  • industrial tanneries
  • biotechnology

Within our offer of filtration solutions we have different types of rotating cloth filters outgoing.

Contact us for more information.

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