| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve equipment efficiency of a plant by restraining omission of selection, and eliminating "a loop phenomenon".SOLUTION: A hue selector has four or more processes of selection means, and carries a selection product within a threshold passed through primary selection means 2a to secondary selection means 2b, carries a selection product outside a threshold passed through the primary selection means 2a to tertiary selection means 2c, recovers the selection product within a threshold passed through the secondary selection means 2b, carries the selection product outside a threshold passed through the secondary selection means 2b to the tertiary selection means 2c, when selection means 2d, of selection means in the post process of the tertiary selection means 2c, is not selection means of the final process, carries the selected selection product within a threshold to selection means 2e of the post process, recovers the selected selection product outside a threshold, and when the selection means 2e, of the selection means in the post proces of the tertiary selection means 2c, is the selection means of the final process, separately recovers the selection product within a threshold and the selection product outside a threshold.</p> |
