An apparatus for producing an elastic composite tape (80) with intermittent elastic sections (72'), comprising:- a tensioning unit (12) for longitudinally tensioning a continuous elastic film (72),- a cut and repitch unit (14) comprising a knife roller (26) and a repitch device (24) comprising a plurality of transport units (32) and a plurality of anvils (30, 30') cooperating with the knife roller (26) to transversely cut the tensioned continuous elastic film (72), wherein the transport units (32, 32', 32") retain - by suction - respective discrete sections of elastic film (72', 72") and alternately space them apart from each other by a first predetermined distance (P1) and a second predetermined distance (P2), with the first distance (P1) greater than the second distance (P2),- a welding unit (16) comprising an anvil roller (60) and a welding head (62) that cooperates 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 depression source and a plurality of protruding teeth (90) intercalated to said suction holes (88), and wherein the transport units (32, 32', 32") pass cyclically through a tangency zone (68) with the anvil roller (60), in which they transfer respective discrete sections of elastic film (72', 72") to said at least one suction section (86) of the anvil roller (60),- a first feeding system (64) for feeding a first continuous nonwoven web (76) to the anvil roller (60) upstream of said tangency zone (68), and- a second feeding system (66) for feeding a second continuous nonwoven web (78) to the anvil roller (60) between said tangency zone (68) and said welding head (62).
