Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Sorting special items or sorting by methods and apparatus...
Patent
1993-11-24
1995-05-30
Dayoan, D. Glenn
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Sorting special items or sorting by methods and apparatus...
209578, 209587, 2504611, 356 51, B07C 502
Patent
active
054194385
ABSTRACT:
In a preferred embodiment, a sorting apparatus according to the present invention includes a conveyor belt for carrying a stream randomly-arranged articles, at least some of which are post-consumer plastic articles made of PVC and others of which are made of PET. The conveyor belt carries the articles to an irradiation area where they are irradiated with ultraviolet light that induces the post-consumer articles of PVC to emit phosphorescent light that persists after the irradiation ends. The conveyor belt then carries the articles to an inspection zone that is isolated from the ultraviolet light. A video camera is positioned to receive phosphorescent light emitted from post-consumer articles made of PVC. Other articles commonly in the stream of post-consumer plastic articles (e.g., PET) do not emit phosphorescent light and are, therefore, distinguishable from the PVC articles.
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Drummond William S.
Squyres H. Parks
Dayoan D. Glenn
Simco/Ramic Corporation
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