Abstract:
The objective of this study was to optimize the performance of orthodox roller (225 kg) in black tea manufacturing by varying the pressure and feeding rate at Wewassa Tea Factory, Passara. Three levels of pressure (P1 - 10 min-no pressure, 10 min-touch bar, P2 - 10 min-no pressure, 5 min-1/4 pressure,5min-no pressure and P3 - 10 min - no pressure, 3 min-1/4 pressure, 2 min - 1/2 pressure) and three levels of feeding rate to the roller (200, 205 and 210 kg) were used as treatment combinations. Currently, the factory using P1 pressure and 200 kg feeding rate for tea manufacturing. Particle size analysis, brightness, TF/TR and organoleptic properties were measured for the triplicate samples and compared with the sample prepared with the factory standard. The results revealed, there is a significant effect of pressure and feeding rate on particle size analysis, but there is no significant effect on color, ratio between theaflavins (TF), thearubigins (TR) and sensory analysis (p<0.05) The treatment combination of feeding rate 210 kg and Pressure P2 has given high amount of particle size belongs to No 3 mesh size while conserving other chemical and organoleptic parameters, thus it can be concluded that this treatment combination is the best.
