in beef or pig hides, and the bones and tendons. It can also be derived from poultry and fish. They have been made for more than 50 years and their share of the market has been increasing. Usually the cost to produce sausages in collagen is significantly lower than making sausages in gut because of higher production speeds and lower labor requirements.

The collagen for artificial casings is processed extensively. It is formed by extrusion through a die to the desired diameter, dried and shirred