PROBLEM TO BE SOLVED: To solve a problem that the effect of a water-repellent layer is short because the water-repellent layer is peeled off at an relatively early period although the high sorting effect is held even in a wet material by forming the water-repellent layer in a conveying face.SOLUTION: The water-repellent layer 43 such as fluorine coatings are applied to both faces of a fin 26. The fin 26 is formed in point symmetry in side view by forming projecting parts 35b, 35c at upper and lower part of the fin. When the water-repellent layer of a front surface F is peeled off, the fin 26 is detached from a supporting member 36, and the fin 26 is attached by being inverted, a rear surface R is used as a functioning surface coming into contact with an object to be treated.COPYRIGHT: (C)2012,JPO&INPIT【課題】移送面に撥水層を形成して、濡れ材に対しても高い選別効率を保持するが、撥水層は比較的早期に剥げ落ち、その効果が短い。【解決手段】フィン26の両面に、フッ素コーティング等の撥水層43を施す。フィン26は、上下に突出部35b、35cを形成して側面視点対称とする、表面Fの撥水層が剥れ落ちると、支持部材36からフィン26を取外して、引っ繰り返して取付け、裏面Rを処理物に接する機能面とする。【選択図】図8
