PLASTIC DISCRIMINATING METHOD

摘要

PROBLEM TO BE SOLVED: To rapidly and accurately discriminate many kinds of plastic inclusive of the grades of them. SOLUTION: The grade related to the kind, rigidity, impact absorbability or the like of a plastic constituting a plastic sample is discriminated on the basis of the data obtained by analyzing the spectrum within an infrared region (wavelength range; 2.5-25μm) of the transmitted or reflected light from the plastic sample. By this constitution, a variety of plastic incapable of being discriminated heretofore by a conventional plastic discriminating method utilizing infrared rays can be discriminated.