Patent ID: 7767173

Claim:
A filtration apparatus for volume-reduced gel-state polystyrene resin, characterized in that the apparatus comprises a filtration unit in the form of a hollow cylinder having an outer peripheral surface formed of a filter portion for filtering volume-reduced gel-state polystyrene resin; a spiral plate provided on the inner surface of the filtration unit, projecting toward the inside of the filtration unit and spiraling in the axial direction of the filtration unit; and a holding/driving portion for holding both axial ends of the filtration unit and for rotating the filtration unit about the axis thereof; wherein the filtration unit is disposed so that the axial direction thereof is positioned generally horizontal, and the volume-reduced gel-state polystyrene resin is fed from the first end of the filtration unit to the inside thereof while the filtration unit is rotated by means of the holding/driving portion, whereby the volume-reduced gel-state polystyrene resin is continuously separated into volume-reduced gel-state polystyrene resin having passed through the filter portion and foreign matter contained in the volume-reduced gel-state polystyrene resin and transferred to the second end of the filtration unit by means of the spiral plate, wherein the filter portion has slits provided in the circumferential direction of the filtration unit in the form of a hollow cylinder, each slit being defined by opposing walls, and wherein the slits are spirally provided.