Have you ever wondered
how coffee is milled?
Milling of coffee is achieved through the following process steps as indicated in the flow diagram below
- Hulling is meant to remove 100% of the outer skin (husk)
- Clean coffee is received from the cleaner by means of bucket elevators and pipes.
- The machine operator monitors the de-stoner by adjusting the inclination of the table deck.
- The coffee moves to the polisher by means of bucket elevators and pipes.
Polishing is meant to remove at least 50% of the silver skin.
- Clean hulled coffee is received from the huller by means of bucket elevators and pipes.
- If targets indicated above are not achieved, the coffee is reworked before grading on authority by the Machine Operator/Shift Supervisor.
- The polisher operator monitors and adjusts feed rate and slide weight accordingly and also verifies husk disposal.
- The coffee is then delivered for grading to the grader through a bucket elevator.
- Coffee is received at the grader and passed through different screens for grading by size.
- Each grade attained is conveyed by elevator to a storage tank where it will be fed to the density table through a bucket elevator and conveyor belts.
- The coffee is delivered on to the density table where it is graded then conveyed to the weighing buffer bins