G - Physics – 01 – N
Patent
G - Physics
01
N
73/53
G01N 21/84 (2006.01) B07C 5/34 (2006.01) G01N 21/35 (2006.01) G01N 33/44 (2006.01) G01N 21/31 (2006.01) G01N 33/00 (2006.01)
Patent
CA 1239293
ABSTRACT The invention relates to a process for measuring the characteristics of test articles made from plastics particularly polyethylene or polypropylene, to establish whether they are made from non-regenerated, regenerated or optionally a similar plastic which has been regenerated to a certain extent by the infrared spectro- metric measurement of the transmission - absorption in the carbonyl group band range of the plastic. According to the invention, the transmission - absorption is measured in the carbonyl group band range at at least two different thicknesses of the same plastic and the thickness dependence of these measurements is used as a measurement criterion. The invention is more particularly used on bottle crates or other large injection moulded articles and can be used for classification preferably with sorting according to ageing criteria, also in the case of test articles made from regenerated material, as well as for the selection of old crates suitable for producing regenerated material. The invention also relates to infrared spectrometric means suitable for performing this process.
480722
Schoeller Christoph
Schoeller Martin
Alexander Schoeller & Co. Ag
Marks & Clerk
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