Roller cover for roller in web manufacturing or processing machine, has circumferential grooves and multiple holes formed as blind holes or suction holes, where cross section of circumferential grooves and blind holes has continuous profile

摘要

The roller cover (2) has one or multiple circumferential grooves (6) and multiple holes formed as blind holes (4a) or suction holes (4b). Cross section of the circumferential grooves and blind holes has a continuous profile. A wall (8) of the blind holes and circumferential groove passes in an area (9) of the blind holes or the circumferential groove without edges. Shape of the cross section is substantially conical with a rounded end or cylindrical with a hemispherical end.