Quote Originally Posted by rmazzullo View Post
Or is it that you can just layer one emulsion on top of another, providing you chill the emulsion stack very soon afterwards that the layers remain separate before mixing has a chance to occur?
There are a few patents for this. This one: http://www.google.com/patents?id=i0M...cascade+coater
shows the coating head in cross section and shows the individual coatings staying in layers.

The text on page four explains that the layers do not mixduring coating.