PROSES PEMBUBUKAN KOPI ROBUSTA DENGAN MEMANFAATKAN MESIN PENGGILING TIPE HAMMER MILL

Abstract

Pulverization is a process that is very influential on the quality of the coffee powder. The smaller the particles of coffee powder, the task of coffe will be more delicious, because the most of the ingredients found in coffee can be dissolved. Milling is a process powdering the roasted beans. The smaller the particle size of coffee that has been milled it will greatly affect the aroma and taste of coffee. The purpose of this study was to determine the effect of the spin machine and coffee grinder coffee roaster temperature on time, the capacity of milling, which is produced by the engine torque, engine efficiency milling coffee, results of pulverization, average particle diameter, and the classification level of refinement. This research was done in two stages, preliminary and primary research. Preliminary research involves determining the optimum engine rotation speed and determination through the roaster temperature preference test that was used as A and B factor, then conducted the main research includes the process of pulverization and sifting the results of robusta coffee mill. Rotation speed of the engine used in this study were 3,365; 2,696 and 2,219 RPM. Roaster time favorite of test results at 160ºC temperature with time at 30 and 35 minutes. The greater capacity and efficiency of the hammer mill machine, the engine rotation speed and temperature of the coffee roaster was increasingly high. But the torque was inversely proportional to the result of pulverization spin speed and temperature roaster coffee. The would be greater the yield and the speed of rotation and torque roaster temperature lower. To get the fine grinding was required major engine rotation speed and high roaster temperature.