Based on the marginal comments that McDonalds made....I don’t think any real testing was done with the paper straws. I could tell you....with my experience with slushies and milkshakes....paperstraws are worthless. And if you used paperstraws with regular sodas....there’s a time-limit of maybe ten minutes that they function correctly.
“with my experience with slushies and milkshakes .... paperstraws are worthless”
How did we survive when once upon a time paper straws were used for all drink sucking?
A restaurant we went to recently had paper straws. They were thicker-walled than the old ones and in my opinion not as good as the old ones, which had thinner walls and a wax coating.
B$ we used them for years before Plastic was even though of. They are easily recycled into CO2 like any other hydrocarbon.