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Nowadays, screw press technology is more advanced due to a demand by oil palm industry to produce high oil production for consumer daily activity. The objective is to analyze the single and twin worm screw press by comparing several designs to maximize their lifespan of the worm screw press. This study used visual inspection, model development and simulation of worm screw press by using SolidWorks and calculation of design properties. Simulating a single tapered shaft and uniform pitch worm screw press with static and dynamic simulation resulted in the total life span yield of 4085 hours and 3621 hours, respectively. Meanwhile, simulating twin tapered shaft and uniform pitch worm screw press with static and dynamic analysis yielded the total life span of 3262 hours and 1685 hours, respectively. The option for the tapered shaft of screw press or uniform pitch was to be able to lessen the maintenance cost and further lifespan of the screw press. [ABSTRACT FROM AUTHOR]

The comparison of reinforcement use on carbon foam between graphite and carbon whisker was studied in this paper. Polyurethane foam is used as a template medium for the fabrication of carbon foam by using template carbonization. Graphite and carbon whisker with various concentration from 0.1% to 0.3% was added into natural carbon foam. The morphology, physical (porosity test) and mechanical (compressive strength) properties were analyzed. The structure of carbon foam with reinforcement added can be analyzed through Scanning Electron Microscope (SEM) besides, the different ways embedded of graphite and carbon whisker on carbon foam shows clearly. For the porosity test, the graphite porosity decrease (67.38% to 56.93%) with the increase of graphite concentration added and for carbon whisker porosity increase (54.97% to 74.6%) when the concentration increase. The compressive strength for graphite increase when the concentration added increase while for carbon whisker, the compressive strength decrease when the concentration increase. The higher compressive strength for graphite is 1.84 N/mm2 (0.3% added) and for carbon whisker at 0.92 N/mm2 (0.1% added). Different reinforcement use will affect the properties of carbon foam. [ABSTRACT FROM AUTHOR]