Destoners

Remove stones, glass, metal, and contaminants from granular materials

Bestseller

Hi-Cap destoner

Models: 2448, 3648, 4848, 6048

The versatile and proven design for the Oliver Manufacturing Hi-Cap is the most popular Destoner for sale in the world. Extract heavy impurities from a larger quantity of light material to purify and add value to your product. Hi-Cap Destoners feature multiple, individually adjustable fans, tilt, and product feed rate for faster, more precise setup and operation. Plus, the unique deck design reduces the loss of good products.

Destoners are essential for separating heavy contaminants like stones, metal, and glass from lighter materials such as seeds, grains, coffee beans, and nuts. By utilizing the principles of gravity and air flow, destoners efficiently remove unwanted debris, improving the purity and quality of the final product. This process is crucial in food processing, seed conditioning, and recycling applications, ensuring product safety and compliance with industry standards. Whether handling bulk agricultural commodities or fine specialty products, a reliable destoning system ensures a cleaner, high-quality output while reducing waste and optimizing production costs.

Key features:

  • Processing up to 15,000 pounds per hour

  • Variable frequency drive for precise deck speed control

  • Spring-loaded adjustable heavy discharge gate(s)

  • Adjustable tilt for enhanced quality

  • All adjustments safely made while in operation

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How do Oliver Manufacturing destoners work?

Our seed destoner machines can separate and remove stones, glass, metals, and other small amounts of unwanted materials using a fluidized bed of air and a vibrating deck that has been tilted – the same principles that apply to gravity separation. Products get fed into the deck and are then fluidized by bursts of pressured air that is blown up from underneath the bed. Lighter particles are blown up higher than heavier particles, and the downward tilt and vibrating motion of the deck allow them to flow to the bottom of the deck. Heavier particles – the stones, glass, metal, and other contaminants – are moved up.

Diagram showing the process of fluidized bed granulation in three stages: initial, intermediate, and final. Each stage depicts a vessel with a bed of particles, an air control gate, and an air distributor at the bottom. The first stage shows a dense bed, the second shows a semi-fluidized bed, and the third shows a fully fluidized bed with particles suspended by air flow.

Airflow is the separating medium in the stratification process. With the fans off, particles rest together on the screen deck. When properly regulated air is introduced, heavier particles settle against the deck while lighter particles rise. Excess airflow can over-lift and blend the material, reducing separation accuracy.

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