Normally I use a knife of a clear pair of scissors when separating links for storage. I was showing someone today how to make sausage and they asked why the links don't open up on the end after being separated. My response was that a) I like to put a little extra spin in to lengthen the amount of casing between links which seems to hold better and b) I let the sausages sit overnight before separating which dries out the casing a little and helps it to hold. That said, neither is foolproof and it's not terribly uncommon for there to be a little leak.
Another friend listening in suggested something that his grandfather taught him which is to use a heated/hot knife or scissors for the cutting which will actually cauterize the casing and seal it. Does anyone have any experience with this, tried it before or dare I say have an opinion on the matter?
Thanks!
edit: referring to fresh sausages here, nothing dried or cooked in any way.....