| 摘要 |
PROBLEM TO BE SOLVED: To easily eliminate clogging of a filtering hole of an outer cylindrical screen without substantially using cleaning water. SOLUTION: A screen press is provided with an outer cylindrical screen and a screw shaft mounted inside the screen so as to be freely rotatable and erecting a helical screw blade on an outer periphery. Along a tip 14a of the screw blade, a flexible forming body 2 made of an elastic body like rubber to form a recessed groove 21 is fitted to an upper part, the upper tips 22a, 22a interposing the recessed groove 21 are extended/contracted by a water pressure toward an inner wall of the cylindrical screen so as to be freely contactable/separatable. Further, by adjusting the pressure of fluid poured to a bottom inside passage 23 of the recessed groove 21, a bottom face 24 of the recessed groove 21 is elevated, the space formed by the recessed groove 21 is expanded/contracted.
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