M^cKINNON Cylindrical Graders offer a unique method of grading coffee. This is achieved through a combination of wire and perforated screen sections. The Cylindrical Grader is modular in construction and individual sections can be replaced, interchanged or redesigned to meet future market variations. The length of each modular section is determined according to the type of coffee being processed and the amount of each grade present in the input. The cylinders are provided with an internal spiral conveyor which conveys the coffee along the cylinder in a very uniform manner, thus ensuring very even and good results.

  Cleaning brushes are provided immediately above the cylinder for the purpose of keeping maximum screening area at all times. The wire sections are made of specially drawn and hardened wire wound round a cylinder. Where no separation of special grades or peaberry is required, all sections are made of perforated sheets. Where peaberry separation is desired, the grader is configured with alternate wire and perforated sections. The graders are provided with input hopper with slide feed regulation device, individual outlet hoppers for each section, rails and hooks for bagging and spouting for further transport. Cylindrical Graders are suitable for Arabica and Robusta varieties.

   Capacities range from 200 kgs. per hour up to 2000 kgs. per hour with cylinders from 12 inches to 30 inches in diameter and lengths from 9 feet to 18 feet. Graders can be configured to give up to nine separations and with twin or triple deck for easy repass and movement of coffee.

   Cylindrical Graders also remove triage from parchment and dry cherry.

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