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Researchers have been using DNA for flow visualization studies owing to its ability to be tagged by a fluorescent dye. We used DNA to study the apparent slip phenomena encountered in the in-mold coating (IMC) flow through thin channels. IMC can be basically considered a carbon black suspension. IMC of sheet molding (SMC) compound is a well-established and environmentally friendly processing technique used by many industries to improve surface quality of parts to meet automotive standards. It is recently being evaluated for use with thermoplastic injection molded parts to obtain similar surface quality improvements and eliminate the need for priming and/or painting. The flow geometry gaps encountered during the coating process, are mostly at the micro-scale. Previous work in our group has shown that the flow can be represented using continuous mechanics approaches with the incorporation of slip at the wall. In this paper, we used DNA, as a model suspension, to make further insights into the nature of the slip flow phenomena encountered during the coating process.

Insights into the slip flow phenomena encountered during in-mold coating (IMC) of plastic parts