| 摘要 |
PROBLEM TO BE SOLVED: To remove foreign matter such as stones or ceramics in recycled glass cullet with high accuracy by simple constitution. SOLUTION: Glass cullet is charged in a hopper 1 collectively to be supplied to a conveyor 2 by small quantity so that cullet pieces K do not overlap each other. The cullet pieces K are carried on the conveyor 2 to fly out from the end part of the conveyor. At this time, the cullet pieces K are irradiated with measuring light from a visible/ultraviolet light source 3 to perform penetrative photographing at the same time by a visible camera 5 and an ultraviolet camera 6. When the cullet pieces K are glass pieces, since glass permits visible light to transmit but does not almost permit ultraviolet rays to transmit, images at a time of penetrative photographing by visible light and ultraviolet rays do not coincide with each other. Since ceramics or stones do not permit both of visible light and ultraviolet rays to transmit, images at a time of penetrative photographing by visible light and ultraviolet rays coincide with each other. Therefore, if two penetrative photographing images do not coincide with each other, glass (target article) is judged and, if coincide, the presence of foreign matter is judged and this foreign matter is blown off by an air nozzle 9 to be classified and removed.
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