A method of producing a web of extensible fibrous material includes passing a web of fibrous material between a cylinder of rigid material having, on the side surface, a plurality of incisions running circumferentially, and a web having an outer layer of elastically compressible material kept locally pressed, at a pressing area, against the side surface of the cylinder, the cylinder and the web being configured and arranged so that the web adheres to the cylinder over a portion located downstream of the pressing area, the web has a portion downstream of the pressing area with a concavity substantially opposite to that of a portion of the web upstream of the pressing area, and the peripheral speeds of the cylinder and the web in the pressing area are substantially equal.

A method of producing a web of extensible fibrous material includes passing a web of fibrous material between a cylinder of rigid material having, on the side surface, a plurality of incisions running circumferentially, and a web having an outer layer of elastically compressible material kept locally pressed, at a pressing area, against the side surface of the cylinder, the cylinder and the web being configured and arranged so that the web adheres to the cylinder over a portion located downstream of the pressing area, the web has a portion downstream of the pressing area with a concavity substantially opposite to that of a portion of the web upstream of the pressing area, and the peripheral speeds of the cylinder and the web in the pressing area are substantially equal.

A method of producing a web of extensible fibrous material includes passing a web of fibrous material between a cylinder of rigid material having, on the side surface, a plurality of incisions running circumferentially, and a web having an outer layer of elastically compressible material kept locally pressed, at a pressing area, against the side surface of the cylinder, the cylinder and the web being configured and arranged so that the web adheres to the cylinder over a portion located downstream of the pressing area, the web has a portion downstream of the pressing area with a concavity substantially opposite to that of a portion of the web upstream of the pressing area, and the peripheral speeds of the cylinder and the web in the pressing area are substantially equal.

A method of producing a web of extensible fibrous material includes passing a web of fibrous material between a cylinder of rigid material having, on the side surface, a plurality of incisions running circumferentially, and a web having an outer layer of elastically compressible material kept locally pressed, at a pressing area, against the side surface of the cylinder, the cylinder and the web being configured and arranged so that the web adheres to the cylinder over a portion located downstream of the pressing area, the web has a portion downstream of the pressing area with a concavity substantially opposite to that of a portion of the web upstream of the pressing area, and the peripheral speeds of the cylinder and the web in the pressing area are substantially equal.