A study of the improvement on analytical precision in various plastic analises by near-infrared spectrophotometer

Abstract

Recycling plastics is a very important step for the solution of climate change, foreign waste import regulations and marine plastic pollution. ｢The Act on Promotion of Resource Circulation for Plastics｣ newly added to ｢The Containers and Packaging Recycling Law｣ and enforced on April 1st 2022. The selection by kinds of plastic materials is an important process in recycling plastics and the near infra-red spectrophotometer (NIRS) is applied as a popular optical apparatus in the mechanical selection.

In our study, we examined the infra-red spectroscopic analyses of various plastics by the portable NIRS combined with a plastic identification program. As a result, we could understand the analytical precision of the above apparatus and confirm the kind of plastic material and the component weight percent in multi-material plastics (laminated film) by using the database (DB) added by us.