Magnets prevent iron parts in industrial flour production plant | Goudsmit Magnetics


Starch & flour

During the harvesting of potatoes, grains, cereals, wheat or barley, large metal particles may come off the land with them. Also, in the processing into starch or flour, small iron or stainless steel wear particles from the processing machines can end up in your product.
Magnets play an important role in the production of starch & flour and prevent damage to grinding mills as well as costly production downtime and product recalls.

Potato starch

An overband magnet separates the large parts from the potato harvest before further processing into potato products, such as starch, takes place.

After the first separation, the potatoes are washed and finely ground by a rasp. This results in wet, liquid potato mousse. During fine grinding, the teeth can break off a rasp.

To remove these, large potato processors place Goudsmit magnetic filters in their pressure lines.

Magnets prevent metal parts in potato starch | Goudsmit Magnetics

Magnets prevent metal parts in potato starch

Corn and rice starch

Metal particles can damage valuable roller mills during the processing of grains, wheat, barley, rice or corn into starch, for example. This leads to damage to grinding mills, resulting in costly production downtime.

It is even more costly if this product ends up with undesired iron particles when the consumer purchases it. This will lead to damage claims or product recalls.

Pressure line magnetic filter for flour | Goudsmit Magnetics

Pressure line magnetic filter for flour

Starch for medicines

Starch is also used in the pharmaceutical industry, as an additive for pills or puffers for breathing medicines.

These often only partly consist of the real active substance. The rest consists of starch or milk powder to give the pill structure and to check the dosage.

Starch has few side effects; an advantage over milk powder, to which many people are allergic. Metal parts such as iron, but also AISI 304 and 316L are completely out of the question for these applications.

Magnets play an important role in three phases of the processing: just after the extraction, during the process and as a final check, just before packaging.

This guarantees an iron-free end product and prevents production downtime, claims and product recalls.

Metal parts can end up in the process in three ways

1. During the extraction

Immediately upon the acceptance of such products in silos or other warehouses, the coarsest metal separation takes place by magnetic drum separators. These are located at the beginning of the process line.


The product is then further processed and cleaned before it ends up in grinding mills.

2. During processing

During processing and cleaning, loose metal particles, such as manufacturing parts, can end up in the product stream. To prevent this, we recommend placing a Cleanflow magnet in front of the grinding mill.


This ensures that it will not be broken by stray iron parts and cause a costly stop in production.

3. After the grinding mill

Stricter requirements in the food industry require a magnet to check and grind the mill. This ensures a high-quality end product and prevents damage claims from customers and consumers as well as product recalls.

The magnet located in this area in the process line separates the fine iron but also stainless steel particles from the product flow at 30 µm. Corn starch is fatty in structure and does not flow properly. Bridge formation can occur on the magnetic bars. To this end, we recommend rotating Cleanflow magnets that make a circular movement and thus ensure that the fatty corn starch cannot leave deposits on the bars.

In the process, the magnets are placed just before where the products are bagged or packaged before being placed in big bags.

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