Collagen casings are made from the collagen
layer in the hides of beef cattle. They come in shirred 'slugs' that are
designed to be placed 'dry' in one piece on the stuffing nozzle, then filled.
Depending on the type of filling, it can be beneficial to splash a little cold
water onto the filled product to help soften the casing prior to linking. As
collagen casings are inflexible when dry, it is best to use a straight filling
nozzle rather than a tapered one