Method of determining type of plastics

Details Method of determining type of plastics Method of determining type of plastics

1994-01-13

1996-04-30

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

25033911, 2503418, G01N 2135

Patent

active

055127525

ABSTRACT:
A method is provided for determining the type of an unknown plastic including the steps of irradiating an unknown plastic with near-infrared rays within a prescribed measurement wavelength range to measure an absorption spectrum, calculating the differential spectrum of the unknown plastic, measuring the differential spectrum at prescribed measurement intervals, determining the class of the differential spectrum by determining whether each measurement is on a plus-side, a minus-side or any other side, comparing the class of the differential spectrum measurement at each interval with a class of a differential spectrum measurement previously determined for each of the intervals over the range for a plurality of plastics of known types, and determining the type of the unknown plastic as the plastic having the highest class agreement ratio.

REFERENCES:
patent: 5015856 (1991-05-01), Gold
patent: 5041996 (1991-08-01), Emering
patent: 5134291 (1992-07-01), Ruhl, Jr. et al.
patent: 5150307 (1992-09-01), McCourt et al.
patent: 5206510 (1993-04-01), Wolf et al.
Weyer, L. G., "Utilizing Zero Crossover Points in the Near Infrared Reflectance Analysis of Industrial Polymers," Journal of Applied Polymer Science, 31:5 (1986), pp. 2417-2431.
European Search Report concerning European Patent Application No. EP 94300251.9 dated May 4, 1994 (2 pages).

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