Desain dan analisis kebutuhan tenaga alat pemarut sagu tipe selinder

Abstract

Indonesia has the largest sago plantation in the world. More than 50% of the total world sago tree are in Indonesia, especially in Irian Jaya and Maluku Province. Sago is a staple food for several native people in some parts of Indonesia. The major problems of traditional sago processing are lack of equipment. Most of the people in Irian Jaya where the largest sago plantation is still use a very inefficient and very labourish way to process sago starch. At some places peoples have already used sago rasper machine which has capacity and efficiency much more than traditional methods but we have not known the optimum characteristics of sago rasper's teeth, the mechanism of sago raspering and the formula to calculate or estimate the power to be needed. The objectives of this research is to design and analysis of rasping power requirement of cylinder type sago rasper. The research features are to investigate teh effect of the diameter and pattern of rasping teeth arrangement on power requirement and rasping quality. The experiment consist of 3 factors: (a) Teeth diameter (b). Teeth pattern arrangement, and (c). Speed of cylinder rotation. The number of teeth contact instantaneously with input depend on time and teeth pattern arrangement. The coefficient of kinetic friction between wood and sago pitch for force perpendicular to fibre and pararrel one were respectively 0,4022 and 0,2603. The static rasping force per teeth for 1 mm and 2 mm diameter were 5.5240 N and 7.9240 N respectively.