Mini-Encyclopedia of Papermaking Wet-End
Part Three: Equipment & Unit Operations
Inversion of an Emulsion
An emulsion is "inverted" when the dispersed phase becomes the continuous phase and vice versa. High-mass acrylamide retention aid products are often prepared and shipped as water-in-oil emulsions. Successful make-down of such an emulsion requires a high degree of dilution (e.g. 200-to-1) and well-controlled hydrodynamic shear. The oil droplets released by inversion of a retention aid emulsion usually are retained harmlessly in the paper product. Problems with inversion of a retention aid emulsion are likely to result in fish-eyes, partly solubilized gels of polymer.
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