These roast with high velocity hot air flow, keeping green coffee beans suspended in the air, turning and moving in the roasting chamber.
A machine which roasts coffee at the desired color, aroma and taste is called the coffee roaster
The roasted coffee is cooled by air and water. Cooling time should not take more than a maximum of five minutes.
Recording the color code will help the future roastings to be at the same quality.
A coffee roaster should have some standard features for quality roasting