| 摘要 |
PROBLEM TO BE SOLVED: To provide a screen net which is simple in structure, can be handled easily, and can be replaced exactly without mistaking selection even when the sizes of granules to be selected are changed. SOLUTION: A net body 33 for selecting/dropping the granules is provided. By swinging in an inclination state at a prescribed angle, the granules supplied to the upper surface of the net body 33 are selected while being made to flow from the upstream side to the downstream side along the surface of an inclined net. A plurality of selection regions 33a-33c different in the size of meshes are formed in the net body 33. In this way, the meshes of the net body 33 are formed to be enlarged gradually from the upstream side toward the downstream side. COPYRIGHT: (C)2004,JPO&NCIPI
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