I am inventing something from different sources - there is not term tio be found, also not on Internet.
"collecting" is the most frequently used term in Ernst when looking at "Auffang". "Collection foil" also is possible, but the "Foliebahn" is not covered by that. "Bahn" is probably best translated by "web" (Ernst), as path does not really serve well here.

HTH

if something falls, especially by an unplanned action, you catch it you don't collect it.
To collect is typically a mor normal procedure.