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On‐line NIR sensing of CO 2 concentration for polymer extrusion foaming processes
Author(s) -
Nagata Takefumi,
Tanigaki Masataka,
Ohshima Masahiro
Publication year - 2000
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11316
Subject(s) - extrusion , materials science , polymer , line (geometry) , chemical engineering , composite material , engineering , mathematics , geometry
An on‐line sensor using near infrared (NIR) spectroscopy is developed for monitoring CO 2 concentration in polymeric extrusion foaming processes. NIR absorption spectra are acquired by a probe installed at the foaming extruder die. The calibration curve relating the absorbance spectrum at 2019 nm to the dissolved gas concentration is derived so as to infer dissolved CO 2 gas concentration on‐line from measured NIR spectra. Experimental results show the developed on‐line NIR sensor can successfully estimate dissolved CO 2 concentration in the molten polymer and illustrate that the developed NIR sensing technique is among the more promising methods for quality control of polymeric extrusion foaming processes.