"ZnAl-LDHs were prepared by single dropping method and double dropping method, which were ..."
Ref: http://www.airitilibrary.com/Publication/alDetailedMesh?doci...

"During the double dropping process the wort (newly brewed, fermenting beer) is first fermented for a period of time before being transferred, under gravity or by other means, into a lower vessel where it continues fermentation. The dropping process has two primary effects on the beer being fermented: the trub that has settled during the first period of fermentation will be left behind, leaving a cleaner beer and a cleaner yeast to crop from the beer for the next fermentation; "

https://www.colchesterbrewery.com/double-drop-brewing-proces...


"a double-drop process . 1.2. Thermoplastic. 3M All Weather Thermoplastic has been specifically"

http://multimedia.3m.com/mws/media/504718O/if-5-24-appl-guid...