Abstract: A low cost heat exchanger exhibits high performance in relation to heat resistance, pressure resistance, prevention of fluid leakage, and heat exchange efficiency. The heat exchanger is equipped with a stacked plate assembly having a plurality of stacked plates, and a hollow tubular casing, which accommodates the stacked plate assembly and extends in the stacking direction. The stacked plate assembly includes the plurality of plates, sealing members for preventing leakage of fluid from fluid paths, and a fixing tool fastening together the plural plates at a position along the central axis thereof. In the heat exchanger, two types of fluids that undergo heat exchange flow in arcuate paths in the interior of hollow portions formed between two adjacent plates, without causing mutual mixing to occur between the two fluids. Adjacent hollow portions are connected in series through bypasses.

Abstract: An emulsifying and dispersing arrangement is provided, in which a handled material undergoes multi-time handling and a dispersion process, for achieving dispersion characteristics exhibiting uniformity of particle size. In addition, the temperature generated in the arrangement is controllable.

Abstract: A concentric multi-shaft assembly (1) comprises a casing (2), a hollow outer shaft (3) that is freely rotatable in the casing, an inner shaft (4) that is freely rotatable in the outer shaft (3) and independently of the outer shaft, an outer shaft seal arrangement (16, 19, 20, 21) sealing between the casing and the outer shaft and an inner shaft seal arrangement (24, 25, 27, 28) sealing between the outer shaft and the inner shaft. The outer shaft seal arrangement includes a spring seat (6) supported by the casing (2) such that it does not rotate when, in use, the outer shaft rotates. The inner shaft seal arrangement comprises a spring seat (8) that is supported by the inner shaft such that it is rotatable with the inner shaft.