Solid-liquid separation is one of the main processes in the agricultural and food industry. Screw pressing is one of the methods solid-liquid separation using mechanical pressing. A new type of screw press (twin screw press: screw diameter = 136 mm, L/D = 6.5, feeding rate = 50-150 kg/h) was designed with partial intermeshing and counter-rotation and tested for oil extraction from oilseeds (sunflower, rapeseed), for squeezing juice from cabbage and dewatering of soy milk residue (okara). Oil recovery with a twin screw press increased compared with the use of a single screw press. The oil expressed with a twin screw press contained a smaller amount of foreign material than single screw oil. Other properties of the oil were also satisfactory. Energy consumption of the twin screw press was the most efficient. Juice recovery from cabbage was also highly efficient (88%) with low energy consumption. Since dewatering of fluid material like soy milk residues was difficult to attain a high level of efficiency even using a twin screw press, the application of electro-osmosis was examined and found to be suitable.