Orifice geometry as a tool for evaluating extensional flow resistance of barrier coating colors, TAPPI Journal November 2024

 


Application: The measurement of extensional flow properties can be used to improve runnability and to reduce risks for defects in various coating processes. This study evaluates the applicability of an orifice geometry add-on in a commercial capillary viscometer for measurement of extensional flow properties of coating colors.

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Author: Martti Toivakka, Andreas Schröder, and Vesa Kukkamo
Orifice geometry as a tool for evaluating extensional flow r
ABSTRACT: Knowledge of extensional flow behavior of coating colors can be beneficial for improving runnability and eliminating defects in various coating processes. The current work evaluates the use of an orifice geometry attached to a commercial capillary viscometer as a tool to obtain extensional flow properties of barrier coating dispersions. By measuring the pressure drop across the orifice as a function of flow velocity, the method presents the flow resistance as Euler number at industrially relevant high deformation rates. The results agree with the earlier results obtained with a capillary entrance pressure loss technique. The type of polymer additive is shown to control the extensional flow resistance, with high molecular weight linear flexible polymers such as polyethylene oxide (PEO) and polyvinyl alcohol (PVOH) having highest impact. The orifice method offers advantages over other approaches, including the need for only a small sample amount, ease of measurement, and access to high deformation rates.
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