Method for producing a netted casing

Method for combining a tubular net with a surface of a carrier casing, wherein air or an inert gas is blown into the carrier casing, said method comprising:

• inflating or pressurizing a carrier casing to have a circular diameter;
• pulling the inflated or pressurized carrier casing in the direction of a tubular net towards a pleating head having a conical constrictor, wherein the tubular net comprises holes or meshes and an open end of the tubular net is attached to a clamp that is both (a) coaxial with a shirring mandrel and (b) located between the pleating head and the shirring mandrel;
• feeding the inflated or pressurized carrier casing into the tubular net while pulling the net inside out over itself, the inflated or pressurized carrier casing further passing through the tubular net;
• pulling the inflated or pressurized carrier casing covered by the tubular net through the pleating head thereby constricting the carrier casing and producing the net/carrier casing combination,
• pulling the net/carrier casing combination toward a shirring machine that comprises the shirring mandrel, wherein air or an inert gas is blown from inside the shirring mandrel at a pressure that forces at least some areas of the carrier casing between the holes or the meshes of the net to form protruding bulges;
• and
• shirring the net/carrier casing combination with the shirring machine.