A method for producing sanitary articles of the pre-fastened type in the form of pants (10, 10') that involves the transverse welding of a composite tape (100, 100') formed of at least two overlapping elastic structures (1a, 1a', 1b, 1b'), which continuously advance in a longitudinal direction (MD) at a first feeding speed (V1) and at a first feed tension (T1) ；- slowing down (70) said composite tape (100, 100'), taking it to a second speed (V2) and a second tension (T2), respectively less than said first feeding speed (V1) and said corresponding first feed tension (T1),- feeding said composite tape (100, 100') at said second speed (V2) and tension (T2) to a welding station (80) and welding (80) said composite tape (100, 100') with welding lines (13) transverse to said longitudinal feed direction (MD), and- feeding said composite tape (100, 100') at said second speed (V2) and tension (T2) to a cutting station (90) and- cutting (90) said composite tape (100, 100') with cuts (12) transverse to said longitudinal feed direction (MD).
