System for sorting post-consumer plastic containers for recyclin

Details System for sorting post-consumer plastic containers for recyclin System for sorting post-consumer plastic containers for recyclin

1996-10-09

1999-04-20

Nguyen, Tuan N.

Classifying, separating, and assorting solids

Sorting special items, and certain methods and apparatus for...

Separating means

209588, 209702, 209942, 250223B, 356240, B07C 700

Patent

active

058949399

ABSTRACT:
A method to sort plastic articles, such as bottles, for recycling utilizes a first sensing area where the bottle is irradiated with circularly polarized light. The circularly polarized light changes polarization on passing through the bottle. The changed circularly polarized light is then detected by personnel wearing glasses having filters oriented to block circularly polarized light of a first handedness and produce light characteristic of the composition of the bottle. The bottle is then sorted for recycling by the personnel based upon the composition of the bottle. The method of the invention may be used as described above or in conjunction with a UV light source to identify bottles made from polyethelene napthalene.

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patent: 5314072 (1994-05-01), Frankel et al.
patent: 5502559 (1996-03-01), Powell et al.
patent: 5699162 (1997-12-01), Pirani et al.

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