Spout for flexible thin-walled packagings

A method of manufacturing a closure assembly comprising a spout and a sacrificial closure, the method comprising:

• making the spout through following sub-steps:
• providing a mold provided with a first half-cavity and a counter-mold provided with a second half-cavity;
• joining the first half-cavity and the second half-cavity and thus obtaining a first cavity corresponding to a first portion of the spout, said first portion comprising a connecting portion and a lower portion of a tube;
• providing an insert suitable for cooperating with the mold and the counter-mold to obtain a second cavity, corresponding to an annular wall for making a second portion of the spout, said second portion corresponding to an end portion of the tube, adjacent to the lower portion, having an outlet mouth, said end portion having an axial length equal to a division distance;
• making the sacrificial closure provided with a skirt provided with a lip seal, protruding radially internally from the skirt, suitable for operating on an outer surface of the tube;
• applying the sacrificial closure to the tube to close the outlet mouth, so that the lip seal engages the outer surface in a sealing region having a sealing distance from the outlet mouth, wherein the sealing distance is less than the division distance,
• wherein the end portion of the tube extends up to a circumferential dividing line corresponding to a connection between the first portion and the second portion of the spout, wherein the first cavity further corresponds to a smooth annular band defined between the first portion and the second portion of the spout and free of any flanges, projections, protrusions on the outer surface of the tube, wherein the circumferential dividing line is contained in the smooth annular band,
• wherein the circumferential dividing line lies on an imaginary plane orthogonal to a main axis of the spout, wherein the imaginary plane corresponds to coupling of the insert with the mold having the first half-cavity and the counter-mold having the second half-cavity.