Process to obtain a round shaped collagen casing and casing obtained by the process

A process to obtain a round shaped collagen casing comprising the steps of:

• a) guiding a straight inflated collagen casing which has a humidity between 12% to 30% balanced to a total weight of the casing and contains collagen plasticizer between 12% to 24% balanced to the total weight of the casing and an inside gas pressure between 20 mbar to 700 mbar to a heat transfer unit;
• b) transferring heat energy to the casing by the heat transfer unit to obtain a round shaped collagen casing, wherein a temperature achieved in an innermost ring of the casing is higher than a shrinkage temperature of the collagen casing;
• and,
• c) supporting the round shaped collagen casing by a round element.