The present disclosure relates to a method for producing a composite skin forming a non-strippable rotationally-symmetrical collar. The method includes draping fabric plies over a mold, providing a separating line on the draped fabric plies, post-impregnating the draped plies with a resin, curing the resin, removing the resulting skin from the mold using a separating line, and, subsequently, splinting two edges of the skin defined by the separating line.