Выражение встречается в следующем контексте:

Caustic will readily make soaps with NAP acids; increased rag layer.

Не могу понять, что такое "rag layer", хоть и нашла объяснение. Может, "хлопья"?
Подскажите, пожалуйста, если кому встречалось.

Вот нашла в инете объяснение:

A similar phenomenon to emulsions is the formation of a ‘rag layer’. This is a layer containing loose solid substances that float at the interface. These solid substances are generally foreign impurities that exist in the feed streams or those that precipitate from the system during extraction. In continuous extraction the liquid interface containing the rag layer can be continuously withdrawn, filtered and sent back to extractor.
Selection of continuous and dispersed phases can have an effect on formation of emulsion and rag layer. Reversing continuous and dispersed phases sometimes drastically reduces or eliminates emulsion formation. Changing extraction temperature could also help in reducing emulsion and rag layer.

Заранее спасибо