Apparatus for producing a composite elasticized web (80) with intermittent elastic sections (72), comprising: - a tensioning unit (12) for tensioning in a longitudinal direction a continuous elastic film (72), - a cutting and repitch unit (14) comprising a knife roller (26) and a rotary repitch device (24) comprising a plurality of transport units (32) and a plurality of anvils (30) cooperating with the knife roller (26) for transversely cutting the continuous tensioned elastic film (72) and forming a succession of discrete sections of elastic film (72), wherein the transport units (32) hold by suction respective discrete sections of elastic film (72) and distance them from each other by a predetermined pitch (P), - a welding unit (16) comprising an anvil roller (60) and a welding head (62) cooperating with the anvil roller (60), wherein the anvil roller (60) has at least one suction section (86) including a plurality of suction holes (88) connected to a source of subatmospheric pressure and a plurality of projecting teeth (90) cooperating with said suction holes (88) and having head surfaces forming counter-welding surfaces which cooperate with said welding head, - a tangency zone (68) between the transport unit (32) and the anvil roller (60) in which the respective discrete sections of elastic film (72) are transferred to said at least one suction section (86) of the anvil roller (60), - a first feeding system (64) for feeding a first web material (76) to the anvil roller (60) upstream of said tangency zone (68), and - a second feeding system (66) for feeding a second web material (78) to the anvil roller (60) between said point of tangency (68) and said welding head (62).
