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In‐line color monitoring of polymers during extrusion using a charge coupled device spectrometer: Color changeovers and residence time distributions
Author(s) -
Gilmor C.,
Balke S. T.,
Calidonio F.,
RomRoginski A.
Publication year - 2003
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.10030
Subject(s) - residence time distribution , materials science , extrusion , spectrometer , residence time (fluid dynamics) , dimensionless quantity , analytical chemistry (journal) , spectral line , optics , composite material , mechanics , chemistry , chromatography , mineralogy , physics , engineering , geotechnical engineering , inclusion (mineral) , astronomy
A fiber‐optic–assisted, charge‐coupled device spectrometer was used to monitor the color of molten polymer concentrates during extrusion. Color coordinates L*, a* and b* were calculated from each of the reflectance spectra as polyethylene color concentrate was replaced by a purge material and as the purge material was replaced by another color concentrate. A method of calculating replacing component residence time distributions and component washout residence time distributions from the spectra was developed and applied. Results with a red and a blue concentrate showed that dimensionless time (time/average residence time) superimposed both residence time distributions and color coordinate variations during changeover from two different extruder screw speeds.