M^cKINNON Dry Destoners are used for removing stones from green coffee, dry parchment or dry cherry. The Destoner is designed to take advantage of the difference in specific weights between the stones and the coffee. The incoming coffee is fed into an inclined sifting frame fitted with a special screen, which is exposed to a controllable air exhaust. The lighter fraction, consisting of good coffee, forms a fluid layer above the sieve and flows over to the outlet while the heavier stones contacting the screens move upslope by the frame vibration. The sieve frame is vibrated through the use of a vibratory motor.

   The machine has an input feed regulation device and an aspiration throat for connection to a central aspiration line or to an individual aspiration line with fan, cyclone, airlocks and piping. The vacuum above the sieve can be adjusted by a butterfly control valve and read on a water gauge tube. Depending upon the input material characteristics, the feed, aspiration intensity, screen inclination, throw angle setting and vibration amplitude can be adjusted for optimum results.

   M^cKINNON Dry Destoners have capacities ranging from 1000 kgs. per hour to 4800 kgs. per hour depending on the input product characteristics.

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