Magdalena Pöttinger, Christian Marschik, Klaus Straka, Klaus Fellner, Georg Steinbichler,
"A Comparative Study of Color Sensors for Inline Color Measurement of Recyclates in Injection Molding"
: PROCEEDINGS OF THE 38TH CONFERENCE OF THE POLYMER PROCESSING SOCIETY ? PPS38, Serie AIP Conference Proceedings, Vol. 3158, Nummer 1, 5-2024
Original Titel:
A Comparative Study of Color Sensors for Inline Color Measurement of Recyclates in Injection Molding
Sprache des Titels:
Englisch
Original Buchtitel:
PROCEEDINGS OF THE 38TH CONFERENCE OF THE POLYMER PROCESSING SOCIETY ? PPS38
Original Kurzfassung:
Achieving a uniform product color is essential in injection molding if specifications are to be met. This, however, is particularly challenging in the direct processing of recyclates, as they own inhomogeneous properties (color, size) and contain contaminants. Inline sensing to assess product color as part of quality control is therefore key. We selected two types of color sensor which can be used for inline measurement in an industrial setting ? spectrophotometers and True Color Sensors. The latter are usually cheaper, show a smaller chip area and higher operating speeds. We compared the inline performance of these two color measuring methods in the injection molding of a range of artificial mixtures of virgin and recycled materials. First, a systematic experimental study was carried out to measure the color of injection molded parts in an offline environment. The proportion of masterbatch was varied between parts to evaluate the accuracy of the measuring systems and to collect data for an automatic color control system for masterbatch content. The sensor giving results that best matched those of the spectrophotometer was then used to investigate thermochromism. Here, the behavior of product color after cooling from demolding to room temperature was examined. The results indicated that temperature has little effect on the product color measured.
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