Method perforating a web of material and apparatus for its manufacture

摘要

Described is a method of perforating a web of material (12) intended to form an outer casing sheet of absorbent articles. During the manufacturing the web is first provided with a large number of mutually separated cuts in the nip defined between raised plateaus (24) on a matrix cylinder (14) and circumferentially extending knife-edges (26) of a cutting cylinder (16). The web (12) is then deformed transversely to its plane at parts, which border on each cut. The apparatus includes a matrix cylinder (14; 14') with row of mutually spaced raised plateaus (24; 24') of its circumference, cutting cylinder (16) includes circumferentially extending knife-edges (26) which are arranged to touch respective plateaus (24; 24') of the matrix cylinder. Next it contains a press cylinder (18) which is mounted downstream of the cutting cylinder and which includes circumferentially extending ribs (28) which are configured to engage in circumferentially extending grooves (30) located between rows of plateaus (24; 24') on the matrix cylinder (14; 14').