A screw press machine for ginger juice extraction

Abstract

This research aims to design and develop a screw press machine for ginger juice extraction. The development steps were to study the physical properties of ginger, design and construct a screw press machine, perform the performance test by Full factorial in Completely Randomized Design (CRD), and carry out the economic analysis. The developed screw press machine consisted of a power transmission unit, pomace discharge port, and screw press unit. The performance tests of screw press machine were performed at the rotation speed of 32, 52 and 72 rpm, the clearance between a die diameter and casing were 1, 2 and 3 mm, and 2 different screw press sets which were increased root diameter with decreased pitch set and increased root diameter with fixed pitch set. Results showed that at the shaft rotation speed of 32 rpm, clearance between the die diameter and casing of 1 mm and increased root diameter with decreased pitch, the average maximum yield was 89.52% with the moisture in the pressed cake of 70.60% wet base. The break-even point of the compressing machine was 789.14 liters-per-year with the payback period for 5 months.