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Screw destoner SO

The screw destoner can be used in conjunction with all root crops. The integration of this system into a processing line dramatically reduces the potential for extreme wear and tear to associated equipment further along the installation. The screw destoner is constructed with a rectangular reception hopper with a vertical transport screw. The screw is driven by a reduction gearbox.

The circular water-filled hopper receives the product to be destoned and in combination with the rotational action of the vertical screw auger draws the water and crop gently up the tube supported by the regularly closed screw.

For better separation of the sand out of polluted products, also a round reception hopper with cone can be used.

The rotational action raises the product allowing the water to gravitate down the side of the auger. Heavy particles with negative buoyancy remain on the bottom of the hopper. Clean product (without stones) are transported out off the upper side of the transport screw.

  • “Sormac listened to us very well and incorporated our set of requirements in a perfect potato line.”

  • Mr. Fred Raupers, Lebenshilfe Gifhorn GmbH

Product specification

With the screw destoner SO products like potatoes and carrots with a diameter of max. 200 mm can be processed.


The capacity of the machine depends on the size of the product, and can be max. 5.000 kg per hour (11,000 lbs/hr).


• simple and effective
• no damage to the product
• low water consumption (approx. 100 l per
1.000 kg / 12 galons/1,000 lbs)
• extremely durable, hard wearing and
• ease of access for cleaning


• feed-in with anti-splash
• electrically operated cranes for filling the container
• special feed-in for carrots

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